diff --git a/dist/boho.cjs b/dist/boho.cjs
index ac044e6..9731d3a 100644
--- a/dist/boho.cjs
+++ b/dist/boho.cjs
@@ -1,2 +1,2 @@
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ot={AUTH_REQ:it(nt.AUTH_REQ),AUTH_NONCE:it(nt.AUTH_NONCE),AUTH_HMAC:it(nt.AUTH_HMAC),AUTH_ACK:it(nt.AUTH_ACK),ENC_PACK:it(nt.ENC_PACK),ENC_488:it(nt.ENC_488)};let ft=!1;try{ft="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function st(e){return ft?t.webcrypto.getRandomValues(E.Buffer.alloc(e)):self.crypto.getRandomValues(E.Buffer.alloc(e))}exports.Boho=class{constructor(){this._id8=E.Buffer.alloc(8),this._otpSrc44=E.Buffer.alloc(44),this._otp36=E.Buffer.alloc(36),this._hmac=E.Buffer.alloc(32),this.auth_salt12=E.Buffer.alloc(12),this.localNonce=E.Buffer.alloc(4),this.remoteNonce=E.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=k(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){k(o.hash(t)).copy(this._id8,0,0,8)}set_key(t){k(o.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=o.hash(t);for(let t=0;t<e;t++)r=o.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;E.Buffer.concat([L("32L",e),L("32L",t),st(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;E.Buffer.concat([L("32L",r),L("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){k(o.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),o.hash(this._otp36)}generateHMAC(t){let e=E.Buffer.concat([this._otpSrc44,t]);this._hmac=k(o.hash(e))}getHMAC8(t){let e=E.Buffer.concat([this._otpSrc44,t]);return this._hmac=k(o.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let n=(t=k(t,r)).byteLength,i=e,o=0,f=0;for(;n>0;){f=n<32?n:32;let e=this.getIndexOTP(++i);for(let r=0;r<f;r++)t[o++]^=e[r];n-=32}return t}auth_req(){return R(T("#type","8",rt.AUTH_REQ),T("#reserved","8",0))}auth_nonce(){let t=Date.now(),e=Math.floor(t/1e3),r=t%1e3;return this.localNonce=st(4),this.auth_salt12=E.Buffer.concat([L("32L",e),L("32L",r),this.localNonce]),E.Buffer.concat([L("8",rt.AUTH_NONCE),this.auth_salt12])}auth_hmac(t){let e=x(t,nt.AUTH_NONCE);if(e){let t=E.Buffer.concat([L("32L",e.unixTime),L("32L",e.milTime),e.nonce]);return this.set_salt12(t),this.localNonce=st(4),this.generateHMAC(this.localNonce),this.remoteNonce=e.nonce,R(T("#header","8",rt.AUTH_HMAC),T("#id8",this._id8),T("#nonce",this.localNonce),T("#hmac32",this._hmac))}return!1}check_auth_hmac(t){let e;if(t instanceof Uint8Array){if(e=x(t,nt.AUTH_HMAC),!e)return}else e=t;this.set_salt12(this.auth_salt12),this.generateHMAC(e.nonce);let r=this._hmac;if(K(e.hmac32,r)){this.remoteNonce=e.nonce;let t=E.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=W(T("header","8",rt.AUTH_ACK),T("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=x(t,nt.AUTH_ACK);if(e){let t=E.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),K(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=k(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_488),T("#len","32L",t.byteLength),T("#otpSrc8",this._otpSrc44.subarray(32,40)),T("#hmac8",e),T("#xdata",r))}decrypt_488(t){let e=x(t=k(t),nt.ENC_488);if(e){let t=E.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(K(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=k(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_PACK),T("#len","32L",t.byteLength),T("#salt12",this._otpSrc44.subarray(32)),T("#hmac8",e),T("#xdata",r))}decryptPack(t){if(t[0]!==rt.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-ot.ENC_PACK)try{let e=x(t,nt.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(K(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=E.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=E.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}},exports.BohoMsg=rt,exports.Buffer=E.Buffer,exports.MBP=tt,exports.Meta=nt,exports.MetaSize=ot,exports.RAND=st,exports.sha256=o;
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ft={AUTH_REQ:ot(it.AUTH_REQ),AUTH_NONCE:ot(it.AUTH_NONCE),AUTH_HMAC:ot(it.AUTH_HMAC),AUTH_ACK:ot(it.AUTH_ACK),ENC_PACK:ot(it.ENC_PACK),ENC_488:ot(it.ENC_488)};let st=!1;try{st="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function ut(e){return st?t.webcrypto.getRandomValues(_.Buffer.alloc(e)):self.crypto.getRandomValues(_.Buffer.alloc(e))}exports.Boho=class{constructor(){this._id8=_.Buffer.alloc(8),this._otpSrc44=_.Buffer.alloc(44),this._otp36=_.Buffer.alloc(36),this._hmac=_.Buffer.alloc(32),this.auth_salt12=_.Buffer.alloc(12),this.localNonce=_.Buffer.alloc(4),this.remoteNonce=_.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=P(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){P(s.hash(t)).copy(this._id8,0,0,8)}set_key(t){P(s.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=s.hash(t);for(let t=0;t<e;t++)r=s.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;_.Buffer.concat([I("32L",e),I("32L",t),ut(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;_.Buffer.concat([I("32L",r),I("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){P(s.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),s.hash(this._otp36)}generateHMAC(t){let e=_.Buffer.concat([this._otpSrc44,t]);this._hmac=P(s.hash(e))}getHMAC8(t){let e=_.Buffer.concat([this._otpSrc44,t]);return this._hmac=P(s.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let n=(t=P(t,r)).byteLength,i=e,o=0,f=0;for(;n>0;){f=n<32?n:32;let e=this.getIndexOTP(++i);for(let r=0;r<f;r++)t[o++]^=e[r];n-=32}return t}auth_req(){return x(v("#type","8",nt.AUTH_REQ),v("#reserved","8",0))}auth_nonce(){let t=Date.now(),e=Math.floor(t/1e3),r=t%1e3;return this.localNonce=ut(4),this.auth_salt12=_.Buffer.concat([I("32L",e),I("32L",r),this.localNonce]),_.Buffer.concat([I("8",nt.AUTH_NONCE),this.auth_salt12])}auth_hmac(t){let e=M(t,it.AUTH_NONCE);if(e){let t=_.Buffer.concat([I("32L",e.unixTime),I("32L",e.milTime),e.nonce]);return this.set_salt12(t),this.localNonce=ut(4),this.generateHMAC(this.localNonce),this.remoteNonce=e.nonce,x(v("#header","8",nt.AUTH_HMAC),v("#id8",this._id8),v("#nonce",this.localNonce),v("#hmac32",this._hmac))}return!1}check_auth_hmac(t){let e;if(t instanceof Uint8Array){if(e=M(t,it.AUTH_HMAC),!e)return}else e=t;this.set_salt12(this.auth_salt12),this.generateHMAC(e.nonce);let r=this._hmac;if(V(e.hmac32,r)){this.remoteNonce=e.nonce;let t=_.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=Z(v("header","8",nt.AUTH_ACK),v("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=M(t,it.AUTH_ACK);if(e){let t=_.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),V(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=P(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return x(v("#type","8",nt.ENC_488),v("#len","32L",t.byteLength),v("#otpSrc8",this._otpSrc44.subarray(32,40)),v("#hmac8",e),v("#xdata",r))}decrypt_488(t){let e=M(t=P(t),it.ENC_488);if(e){let t=_.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(V(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=P(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return x(v("#type","8",nt.ENC_PACK),v("#len","32L",t.byteLength),v("#salt12",this._otpSrc44.subarray(32)),v("#hmac8",e),v("#xdata",r))}decryptPack(t){if(t[0]!==nt.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-ft.ENC_PACK)try{let e=M(t,it.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(V(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=_.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=_.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}},exports.BohoMsg=nt,exports.Buffer=_.Buffer,exports.MBP=et,exports.Meta=it,exports.MetaSize=ft,exports.RAND=ut,exports.sha256=s;
diff --git a/dist/boho.esm.js b/dist/boho.esm.js
index 231bfe6..11d48bc 100644
--- a/dist/boho.esm.js
+++ b/dist/boho.esm.js
@@ -1,3 +1,3 @@
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it={AUTH_REQ:nt(rt.AUTH_REQ),AUTH_NONCE:nt(rt.AUTH_NONCE),AUTH_HMAC:nt(rt.AUTH_HMAC),AUTH_ACK:nt(rt.AUTH_ACK),ENC_PACK:nt(rt.ENC_PACK),ENC_488:nt(rt.ENC_488)};let ot=!1;try{ot="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function ft(t){return ot?webcrypto.getRandomValues(E.Buffer.alloc(t)):self.crypto.getRandomValues(E.Buffer.alloc(t))}class st{constructor(){this._id8=E.Buffer.alloc(8),this._otpSrc44=E.Buffer.alloc(44),this._otp36=E.Buffer.alloc(36),this._hmac=E.Buffer.alloc(32),this.auth_salt12=E.Buffer.alloc(12),this.localNonce=E.Buffer.alloc(4),this.remoteNonce=E.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=x(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){x(i.hash(t)).copy(this._id8,0,0,8)}set_key(t){x(i.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=i.hash(t);for(let t=0;t<e;t++)r=i.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;E.Buffer.concat([U("32L",e),U("32L",t),ft(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;E.Buffer.concat([U("32L",r),U("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){x(i.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),i.hash(this._otp36)}generateHMAC(t){let e=E.Buffer.concat([this._otpSrc44,t]);this._hmac=x(i.hash(e))}getHMAC8(t){let e=E.Buffer.concat([this._otpSrc44,t]);return this._hmac=x(i.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let 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t=E.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=X(I("header","8",et.AUTH_ACK),I("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=R(t,rt.AUTH_ACK);if(e){let t=E.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),D(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=x(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return O(I("#type","8",et.ENC_488),I("#len","32L",t.byteLength),I("#otpSrc8",this._otpSrc44.subarray(32,40)),I("#hmac8",e),I("#xdata",r))}decrypt_488(t){let e=R(t=x(t),rt.ENC_488);if(e){let t=E.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(D(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=x(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return O(I("#type","8",et.ENC_PACK),I("#len","32L",t.byteLength),I("#salt12",this._otpSrc44.subarray(32)),I("#hmac8",e),I("#xdata",r))}decryptPack(t){if(t[0]!==et.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-it.ENC_PACK)try{let e=R(t,rt.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(D(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=E.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=E.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}}var ut=E.Buffer;export{st as Boho,et as BohoMsg,ut as Buffer,Z as MBP,rt as Meta,it as MetaSize,ft as RAND,i as sha256};
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ot={AUTH_REQ:it(nt.AUTH_REQ),AUTH_NONCE:it(nt.AUTH_NONCE),AUTH_HMAC:it(nt.AUTH_HMAC),AUTH_ACK:it(nt.AUTH_ACK),ENC_PACK:it(nt.ENC_PACK),ENC_488:it(nt.ENC_488)};let ft=!1;try{ft="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function st(t){return ft?webcrypto.getRandomValues(A.Buffer.alloc(t)):self.crypto.getRandomValues(A.Buffer.alloc(t))}class ut{constructor(){this._id8=A.Buffer.alloc(8),this._otpSrc44=A.Buffer.alloc(44),this._otp36=A.Buffer.alloc(36),this._hmac=A.Buffer.alloc(32),this.auth_salt12=A.Buffer.alloc(12),this.localNonce=A.Buffer.alloc(4),this.remoteNonce=A.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=k(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){k(f.hash(t)).copy(this._id8,0,0,8)}set_key(t){k(f.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=f.hash(t);for(let t=0;t<e;t++)r=f.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;A.Buffer.concat([L("32L",e),L("32L",t),st(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;A.Buffer.concat([L("32L",r),L("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){k(f.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),f.hash(this._otp36)}generateHMAC(t){let e=A.Buffer.concat([this._otpSrc44,t]);this._hmac=k(f.hash(e))}getHMAC8(t){let e=A.Buffer.concat([this._otpSrc44,t]);return this._hmac=k(f.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let n=(t=k(t,r)).byteLength,i=e,o=0,f=0;for(;n>0;){f=n<32?n:32;let e=this.getIndexOTP(++i);for(let r=0;r<f;r++)t[o++]^=e[r];n-=32}return t}auth_req(){return R(T("#type","8",rt.AUTH_REQ),T("#reserved","8",0))}auth_nonce(){let t=Date.now(),e=Math.floor(t/1e3),r=t%1e3;return this.localNonce=st(4),this.auth_salt12=A.Buffer.concat([L("32L",e),L("32L",r),this.localNonce]),A.Buffer.concat([L("8",rt.AUTH_NONCE),this.auth_salt12])}auth_hmac(t){let e=M(t,nt.AUTH_NONCE);if(e){let t=A.Buffer.concat([L("32L",e.unixTime),L("32L",e.milTime),e.nonce]);return this.set_salt12(t),this.localNonce=st(4),this.generateHMAC(this.localNonce),this.remoteNonce=e.nonce,R(T("#header","8",rt.AUTH_HMAC),T("#id8",this._id8),T("#nonce",this.localNonce),T("#hmac32",this._hmac))}return!1}check_auth_hmac(t){let e;if(t instanceof Uint8Array){if(e=M(t,nt.AUTH_HMAC),!e)return}else e=t;this.set_salt12(this.auth_salt12),this.generateHMAC(e.nonce);let r=this._hmac;if(K(e.hmac32,r)){this.remoteNonce=e.nonce;let t=A.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=W(T("header","8",rt.AUTH_ACK),T("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=M(t,nt.AUTH_ACK);if(e){let t=A.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),K(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=k(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_488),T("#len","32L",t.byteLength),T("#otpSrc8",this._otpSrc44.subarray(32,40)),T("#hmac8",e),T("#xdata",r))}decrypt_488(t){let e=M(t=k(t),nt.ENC_488);if(e){let t=A.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(K(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=k(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_PACK),T("#len","32L",t.byteLength),T("#salt12",this._otpSrc44.subarray(32)),T("#hmac8",e),T("#xdata",r))}decryptPack(t){if(t[0]!==rt.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-ot.ENC_PACK)try{let e=M(t,nt.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(K(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=A.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=A.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}}var ht=A.Buffer;export{ut as Boho,rt as BohoMsg,ht as Buffer,tt as MBP,nt as Meta,ot as MetaSize,st as RAND,f as sha256};
 //# sourceMappingURL=boho.esm.js.map
diff --git a/dist/boho.esm.js.map b/dist/boho.esm.js.map
index ed2c101..56eacca 100644
--- a/dist/boho.esm.js.map
+++ b/dist/boho.esm.js.map
@@ -1 +1 @@
-{"version":3,"file":"boho.esm.js","sources":["../lib/fast-sha256.js","../node_modules/base64-js/index.js","../node_modules/ieee754/index.js","../node_modules/buffer/index.js","../node_modules/meta-buffer-pack/src/meta-buffer-pack.js","../src/sha256-mbp.js","../src/constants.js","../src/boho.js"],"sourcesContent":["// SHA-256 (+ HMAC and PBKDF2) for JavaScript.\n//\n// Written in 2014-2016 by Dmitry Chestnykh.\n// Public domain, no warranty.\n//\n// Functions (accept and return Uint8Arrays):\n//\n//   sha256(message) -> hash\n//   sha256.hmac(key, message) -> mac\n//   sha256.pbkdf2(password, salt, rounds, dkLen) -> dk\n//\n//  Classes:\n//\n//   new sha256.Hash()\n//   new sha256.HMAC(key)\n//\nexport var digestLength = 32\nexport var blockSize = 64\n// SHA-256 constants\nconst K = new Uint32Array([\n  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,\n  0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,\n  0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,\n  0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,\n  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,\n  0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,\n  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,\n  0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\n  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,\n  0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,\n  0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,\n  0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,\n  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\n])\nfunction hashBlocks (w, v, p, pos, len) {\n  let a, b, c, d, e, f, g, h, u, i, j, t1, t2\n  while (len >= 64) {\n    a = v[0]\n    b = v[1]\n    c = v[2]\n    d = v[3]\n    e = v[4]\n    f = v[5]\n    g = v[6]\n    h = v[7]\n    for (i = 0; i < 16; i++) {\n      j = pos + i * 4\n      w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |\n                ((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff))\n    }\n    for (i = 16; i < 64; i++) {\n      u = w[i - 2]\n      t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10)\n      u = w[i - 15]\n      t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3)\n      w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0)\n    }\n    for (i = 0; i < 64; i++) {\n      t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^\n                (e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +\n                ((h + ((K[i] + w[i]) | 0)) | 0)) | 0\n      t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^\n                (a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 0\n      h = g\n      g = f\n      f = e\n      e = (d + t1) | 0\n      d = c\n      c = b\n      b = a\n      a = (t1 + t2) | 0\n    }\n    v[0] += a\n    v[1] += b\n    v[2] += c\n    v[3] += d\n    v[4] += e\n    v[5] += f\n    v[6] += g\n    v[7] += h\n    pos += 64\n    len -= 64\n  }\n  return pos\n}\n// Hash implements SHA256 hash algorithm.\nconst Hash = /** @class */ (function () {\n  function Hash () {\n    this.digestLength = digestLength\n    this.blockSize = blockSize\n    // Note: Int32Array is used instead of Uint32Array for performance reasons.\n    this.state = new Int32Array(8) // hash state\n    this.temp = new Int32Array(64) // temporary state\n    this.buffer = new Uint8Array(128) // buffer for data to hash\n    this.bufferLength = 0 // number of bytes in buffer\n    this.bytesHashed = 0 // number of total bytes hashed\n    this.finished = false // indicates whether the hash was finalized\n    this.reset()\n  }\n  // Resets hash state making it possible\n  // to re-use this instance to hash other data.\n  Hash.prototype.reset = function () {\n    this.state[0] = 0x6a09e667\n    this.state[1] = 0xbb67ae85\n    this.state[2] = 0x3c6ef372\n    this.state[3] = 0xa54ff53a\n    this.state[4] = 0x510e527f\n    this.state[5] = 0x9b05688c\n    this.state[6] = 0x1f83d9ab\n    this.state[7] = 0x5be0cd19\n    this.bufferLength = 0\n    this.bytesHashed = 0\n    this.finished = false\n    return this\n  }\n  // Cleans internal buffers and re-initializes hash state.\n  Hash.prototype.clean = function () {\n    for (var i = 0; i < this.buffer.length; i++) {\n      this.buffer[i] = 0\n    }\n    for (var i = 0; i < this.temp.length; i++) {\n      this.temp[i] = 0\n    }\n    this.reset()\n  }\n  // Updates hash state with the given data.\n  //\n  // Optionally, length of the data can be specified to hash\n  // fewer bytes than data.length.\n  //\n  // Throws error when trying to update already finalized hash:\n  // instance must be reset to use it again.\n  Hash.prototype.update = function (data, dataLength) {\n    if (dataLength === void 0) { dataLength = data.length }\n    if (this.finished) {\n      throw new Error(\"SHA256: can't update because hash was finished.\")\n    }\n    let dataPos = 0\n    this.bytesHashed += dataLength\n    if (this.bufferLength > 0) {\n      while (this.bufferLength < 64 && dataLength > 0) {\n        this.buffer[this.bufferLength++] = data[dataPos++]\n        dataLength--\n      }\n      if (this.bufferLength === 64) {\n        hashBlocks(this.temp, this.state, this.buffer, 0, 64)\n        this.bufferLength = 0\n      }\n    }\n    if (dataLength >= 64) {\n      dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength)\n      dataLength %= 64\n    }\n    while (dataLength > 0) {\n      this.buffer[this.bufferLength++] = data[dataPos++]\n      dataLength--\n    }\n    return this\n  }\n  // Finalizes hash state and puts hash into out.\n  //\n  // If hash was already finalized, puts the same value.\n  Hash.prototype.finish = function (out) {\n    if (!this.finished) {\n      const bytesHashed = this.bytesHashed\n      const left = this.bufferLength\n      const bitLenHi = (bytesHashed / 0x20000000) | 0\n      const bitLenLo = bytesHashed << 3\n      const padLength = (bytesHashed % 64 < 56) ? 64 : 128\n      this.buffer[left] = 0x80\n      for (var i = left + 1; i < padLength - 8; i++) {\n        this.buffer[i] = 0\n      }\n      this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff\n      this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff\n      this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff\n      this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff\n      this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff\n      this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff\n      this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff\n      this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff\n      hashBlocks(this.temp, this.state, this.buffer, 0, padLength)\n      this.finished = true\n    }\n    for (var i = 0; i < 8; i++) {\n      out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff\n      out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff\n      out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff\n      out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff\n    }\n    return this\n  }\n  // Returns the final hash digest.\n  Hash.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._saveState = function (out) {\n    for (let i = 0; i < this.state.length; i++) {\n      out[i] = this.state[i]\n    }\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._restoreState = function (from, bytesHashed) {\n    for (let i = 0; i < this.state.length; i++) {\n      this.state[i] = from[i]\n    }\n    this.bytesHashed = bytesHashed\n    this.finished = false\n    this.bufferLength = 0\n  }\n  return Hash\n}())\nexport { Hash }\n// HMAC implements HMAC-SHA256 message authentication algorithm.\nconst HMAC = /** @class */ (function () {\n  function HMAC (key) {\n    this.inner = new Hash()\n    this.outer = new Hash()\n    this.blockSize = this.inner.blockSize\n    this.digestLength = this.inner.digestLength\n    const pad = new Uint8Array(this.blockSize)\n    if (key.length > this.blockSize) {\n      (new Hash()).update(key).finish(pad).clean()\n    } else {\n      for (var i = 0; i < key.length; i++) {\n        pad[i] = key[i]\n      }\n    }\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36\n    }\n    this.inner.update(pad)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36 ^ 0x5c\n    }\n    this.outer.update(pad)\n    this.istate = new Uint32Array(8)\n    this.ostate = new Uint32Array(8)\n    this.inner._saveState(this.istate)\n    this.outer._saveState(this.ostate)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] = 0\n    }\n  }\n  // Returns HMAC state to the state initialized with key\n  // to make it possible to run HMAC over the other data with the same\n  // key without creating a new instance.\n  HMAC.prototype.reset = function () {\n    this.inner._restoreState(this.istate, this.inner.blockSize)\n    this.outer._restoreState(this.ostate, this.outer.blockSize)\n    return this\n  }\n  // Cleans HMAC state.\n  HMAC.prototype.clean = function () {\n    for (let i = 0; i < this.istate.length; i++) {\n      this.ostate[i] = this.istate[i] = 0\n    }\n    this.inner.clean()\n    this.outer.clean()\n  }\n  // Updates state with provided data.\n  HMAC.prototype.update = function (data) {\n    this.inner.update(data)\n    return this\n  }\n  // Finalizes HMAC and puts the result in out.\n  HMAC.prototype.finish = function (out) {\n    if (this.outer.finished) {\n      this.outer.finish(out)\n    } else {\n      this.inner.finish(out)\n      this.outer.update(out, this.digestLength).finish(out)\n    }\n    return this\n  }\n  // Returns message authentication code.\n  HMAC.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  return HMAC\n}())\nexport { HMAC }\n// Returns SHA256 hash of data.\nexport function hash (data) {\n  const h = (new Hash()).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Function hash is both available as module.hash and as default export.\nexport default hash\n// Returns HMAC-SHA256 of data under the key.\nexport function hmac (key, data) {\n  const h = (new HMAC(key)).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Fills hkdf buffer like this:\n// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)\nfunction fillBuffer (buffer, hmac, info, counter) {\n  // Counter is a byte value: check if it overflowed.\n  const num = counter[0]\n  if (num === 0) {\n    throw new Error('hkdf: cannot expand more')\n  }\n  // Prepare HMAC instance for new data with old key.\n  hmac.reset()\n  // Hash in previous output if it was generated\n  // (i.e. counter is greater than 1).\n  if (num > 1) {\n    hmac.update(buffer)\n  }\n  // Hash in info if it exists.\n  if (info) {\n    hmac.update(info)\n  }\n  // Hash in the counter.\n  hmac.update(counter)\n  // Output result to buffer and clean HMAC instance.\n  hmac.finish(buffer)\n  // Increment counter inside typed array, this works properly.\n  counter[0]++\n}\nconst hkdfSalt = new Uint8Array(digestLength) // Filled with zeroes.\nexport function hkdf (key, salt, info, length) {\n  if (salt === void 0) { salt = hkdfSalt }\n  if (length === void 0) { length = 32 }\n  const counter = new Uint8Array([1])\n  // HKDF-Extract uses salt as HMAC key, and key as data.\n  const okm = hmac(salt, key)\n  // Initialize HMAC for expanding with extracted key.\n  // Ensure no collisions with `hmac` function.\n  const hmac_ = new HMAC(okm)\n  // Allocate buffer.\n  const buffer = new Uint8Array(hmac_.digestLength)\n  let bufpos = buffer.length\n  const out = new Uint8Array(length)\n  for (let i = 0; i < length; i++) {\n    if (bufpos === buffer.length) {\n      fillBuffer(buffer, hmac_, info, counter)\n      bufpos = 0\n    }\n    out[i] = buffer[bufpos++]\n  }\n  hmac_.clean()\n  buffer.fill(0)\n  counter.fill(0)\n  return out\n}\n// Derives a key from password and salt using PBKDF2-HMAC-SHA256\n// with the given number of iterations.\n//\n// The number of bytes returned is equal to dkLen.\n//\n// (For better security, avoid dkLen greater than hash length - 32 bytes).\nexport function pbkdf2 (password, salt, iterations, dkLen) {\n  const prf = new HMAC(password)\n  const len = prf.digestLength\n  const ctr = new Uint8Array(4)\n  const t = new Uint8Array(len)\n  const u = new Uint8Array(len)\n  const dk = new Uint8Array(dkLen)\n  for (var i = 0; i * len < dkLen; i++) {\n    const c = i + 1\n    ctr[0] = (c >>> 24) & 0xff\n    ctr[1] = (c >>> 16) & 0xff\n    ctr[2] = (c >>> 8) & 0xff\n    ctr[3] = (c >>> 0) & 0xff\n    prf.reset()\n    prf.update(salt)\n    prf.update(ctr)\n    prf.finish(u)\n    for (var j = 0; j < len; j++) {\n      t[j] = u[j]\n    }\n    for (var j = 2; j <= iterations; j++) {\n      prf.reset()\n      prf.update(u).finish(u)\n      for (let k = 0; k < len; k++) {\n        t[k] ^= u[k]\n      }\n    }\n    for (var j = 0; j < len && i * len + j < dkLen; j++) {\n      dk[i * len + j] = t[j]\n    }\n  }\n  for (var i = 0; i < len; i++) {\n    t[i] = u[i] = 0\n  }\n  for (var i = 0; i < 4; i++) {\n    ctr[i] = 0\n  }\n  prf.clean()\n  return dk\n}\n","'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\n// Support decoding URL-safe base64 strings, as Node.js does.\n// See: https://en.wikipedia.org/wiki/Base64#URL_applications\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction getLens (b64) {\n  var len = b64.length\n\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // Trim off extra bytes after placeholder bytes are found\n  // See: https://github.com/beatgammit/base64-js/issues/42\n  var validLen = b64.indexOf('=')\n  if (validLen === -1) validLen = len\n\n  var placeHoldersLen = validLen === len\n    ? 0\n    : 4 - (validLen % 4)\n\n  return [validLen, placeHoldersLen]\n}\n\n// base64 is 4/3 + up to two characters of the original data\nfunction byteLength (b64) {\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction _byteLength (b64, validLen, placeHoldersLen) {\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction toByteArray (b64) {\n  var tmp\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n\n  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))\n\n  var curByte = 0\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  var len = placeHoldersLen > 0\n    ? validLen - 4\n    : validLen\n\n  var i\n  for (i = 0; i < len; i += 4) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 18) |\n      (revLookup[b64.charCodeAt(i + 1)] << 12) |\n      (revLookup[b64.charCodeAt(i + 2)] << 6) |\n      revLookup[b64.charCodeAt(i + 3)]\n    arr[curByte++] = (tmp >> 16) & 0xFF\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 2) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 2) |\n      (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 1) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 10) |\n      (revLookup[b64.charCodeAt(i + 1)] << 4) |\n      (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] +\n    lookup[num >> 12 & 0x3F] +\n    lookup[num >> 6 & 0x3F] +\n    lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp =\n      ((uint8[i] << 16) & 0xFF0000) +\n      ((uint8[i + 1] << 8) & 0xFF00) +\n      (uint8[i + 2] & 0xFF)\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 2] +\n      lookup[(tmp << 4) & 0x3F] +\n      '=='\n    )\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 10] +\n      lookup[(tmp >> 4) & 0x3F] +\n      lookup[(tmp << 2) & 0x3F] +\n      '='\n    )\n  }\n\n  return parts.join('')\n}\n","/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */\nexports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n","/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <https://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nconst base64 = require('base64-js')\nconst ieee754 = require('ieee754')\nconst customInspectSymbol =\n  (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation\n    ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation\n    : null\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\nconst K_MAX_LENGTH = 0x7fffffff\nexports.kMaxLength = K_MAX_LENGTH\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Print warning and recommend using `buffer` v4.x which has an Object\n *               implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * We report that the browser does not support typed arrays if the are not subclassable\n * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`\n * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support\n * for __proto__ and has a buggy typed array implementation.\n */\nBuffer.TYPED_ARRAY_SUPPORT = typedArraySupport()\n\nif (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&\n    typeof console.error === 'function') {\n  console.error(\n    'This browser lacks typed array (Uint8Array) support which is required by ' +\n    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'\n  )\n}\n\nfunction typedArraySupport () {\n  // Can typed array instances can be augmented?\n  try {\n    const arr = new Uint8Array(1)\n    const proto = { foo: function () { return 42 } }\n    Object.setPrototypeOf(proto, Uint8Array.prototype)\n    Object.setPrototypeOf(arr, proto)\n    return arr.foo() === 42\n  } catch (e) {\n    return false\n  }\n}\n\nObject.defineProperty(Buffer.prototype, 'parent', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.buffer\n  }\n})\n\nObject.defineProperty(Buffer.prototype, 'offset', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.byteOffset\n  }\n})\n\nfunction createBuffer (length) {\n  if (length > K_MAX_LENGTH) {\n    throw new RangeError('The value \"' + length + '\" is invalid for option \"size\"')\n  }\n  // Return an augmented `Uint8Array` instance\n  const buf = new Uint8Array(length)\n  Object.setPrototypeOf(buf, Buffer.prototype)\n  return buf\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new TypeError(\n        'The \"string\" argument must be of type string. Received type number'\n      )\n    }\n    return allocUnsafe(arg)\n  }\n  return from(arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\nfunction from (value, encodingOrOffset, length) {\n  if (typeof value === 'string') {\n    return fromString(value, encodingOrOffset)\n  }\n\n  if (ArrayBuffer.isView(value)) {\n    return fromArrayView(value)\n  }\n\n  if (value == null) {\n    throw new TypeError(\n      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n      'or Array-like Object. Received type ' + (typeof value)\n    )\n  }\n\n  if (isInstance(value, ArrayBuffer) ||\n      (value && isInstance(value.buffer, ArrayBuffer))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof SharedArrayBuffer !== 'undefined' &&\n      (isInstance(value, SharedArrayBuffer) ||\n      (value && isInstance(value.buffer, SharedArrayBuffer)))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'number') {\n    throw new TypeError(\n      'The \"value\" argument must not be of type number. Received type number'\n    )\n  }\n\n  const valueOf = value.valueOf && value.valueOf()\n  if (valueOf != null && valueOf !== value) {\n    return Buffer.from(valueOf, encodingOrOffset, length)\n  }\n\n  const b = fromObject(value)\n  if (b) return b\n\n  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&\n      typeof value[Symbol.toPrimitive] === 'function') {\n    return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)\n  }\n\n  throw new TypeError(\n    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n    'or Array-like Object. Received type ' + (typeof value)\n  )\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(value, encodingOrOffset, length)\n}\n\n// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:\n// https://github.com/feross/buffer/pull/148\nObject.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)\nObject.setPrototypeOf(Buffer, Uint8Array)\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be of type number')\n  } else if (size < 0) {\n    throw new RangeError('The value \"' + size + '\" is invalid for option \"size\"')\n  }\n}\n\nfunction alloc (size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpreted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(size).fill(fill, encoding)\n      : createBuffer(size).fill(fill)\n  }\n  return createBuffer(size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(size, fill, encoding)\n}\n\nfunction allocUnsafe (size) {\n  assertSize(size)\n  return createBuffer(size < 0 ? 0 : checked(size) | 0)\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(size)\n}\n\nfunction fromString (string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('Unknown encoding: ' + encoding)\n  }\n\n  const length = byteLength(string, encoding) | 0\n  let buf = createBuffer(length)\n\n  const actual = buf.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    buf = buf.slice(0, actual)\n  }\n\n  return buf\n}\n\nfunction fromArrayLike (array) {\n  const length = array.length < 0 ? 0 : checked(array.length) | 0\n  const buf = createBuffer(length)\n  for (let i = 0; i < length; i += 1) {\n    buf[i] = array[i] & 255\n  }\n  return buf\n}\n\nfunction fromArrayView (arrayView) {\n  if (isInstance(arrayView, Uint8Array)) {\n    const copy = new Uint8Array(arrayView)\n    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)\n  }\n  return fromArrayLike(arrayView)\n}\n\nfunction fromArrayBuffer (array, byteOffset, length) {\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\"offset\" is outside of buffer bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\"length\" is outside of buffer bounds')\n  }\n\n  let buf\n  if (byteOffset === undefined && length === undefined) {\n    buf = new Uint8Array(array)\n  } else if (length === undefined) {\n    buf = new Uint8Array(array, byteOffset)\n  } else {\n    buf = new Uint8Array(array, byteOffset, length)\n  }\n\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(buf, Buffer.prototype)\n\n  return buf\n}\n\nfunction fromObject (obj) {\n  if (Buffer.isBuffer(obj)) {\n    const len = checked(obj.length) | 0\n    const buf = createBuffer(len)\n\n    if (buf.length === 0) {\n      return buf\n    }\n\n    obj.copy(buf, 0, 0, len)\n    return buf\n  }\n\n  if (obj.length !== undefined) {\n    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {\n      return createBuffer(0)\n    }\n    return fromArrayLike(obj)\n  }\n\n  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {\n    return fromArrayLike(obj.data)\n  }\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= K_MAX_LENGTH) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return b != null && b._isBuffer === true &&\n    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false\n}\n\nBuffer.compare = function compare (a, b) {\n  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)\n  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError(\n      'The \"buf1\", \"buf2\" arguments must be one of type Buffer or Uint8Array'\n    )\n  }\n\n  if (a === b) return 0\n\n  let x = a.length\n  let y = b.length\n\n  for (let i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!Array.isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  let i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  const buffer = Buffer.allocUnsafe(length)\n  let pos = 0\n  for (i = 0; i < list.length; ++i) {\n    let buf = list[i]\n    if (isInstance(buf, Uint8Array)) {\n      if (pos + buf.length > buffer.length) {\n        if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)\n        buf.copy(buffer, pos)\n      } else {\n        Uint8Array.prototype.set.call(\n          buffer,\n          buf,\n          pos\n        )\n      }\n    } else if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    } else {\n      buf.copy(buffer, pos)\n    }\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    throw new TypeError(\n      'The \"string\" argument must be one of type string, Buffer, or ArrayBuffer. ' +\n      'Received type ' + typeof string\n    )\n  }\n\n  const len = string.length\n  const mustMatch = (arguments.length > 2 && arguments[2] === true)\n  if (!mustMatch && len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) {\n          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8\n        }\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  let loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)\n// to detect a Buffer instance. It's not possible to use `instanceof Buffer`\n// reliably in a browserify context because there could be multiple different\n// copies of the 'buffer' package in use. This method works even for Buffer\n// instances that were created from another copy of the `buffer` package.\n// See: https://github.com/feross/buffer/issues/154\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  const i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  const len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (let i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  const len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (let i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  const len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (let i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  const length = this.length\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.toLocaleString = Buffer.prototype.toString\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  let str = ''\n  const max = exports.INSPECT_MAX_BYTES\n  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()\n  if (this.length > max) str += ' ... '\n  return '<Buffer ' + str + '>'\n}\nif (customInspectSymbol) {\n  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (isInstance(target, Uint8Array)) {\n    target = Buffer.from(target, target.offset, target.byteLength)\n  }\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError(\n      'The \"target\" argument must be one of type Buffer or Uint8Array. ' +\n      'Received type ' + (typeof target)\n    )\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  let x = thisEnd - thisStart\n  let y = end - start\n  const len = Math.min(x, y)\n\n  const thisCopy = this.slice(thisStart, thisEnd)\n  const targetCopy = target.slice(start, end)\n\n  for (let i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset // Coerce to Number.\n  if (numberIsNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  let indexSize = 1\n  let arrLength = arr.length\n  let valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  let i\n  if (dir) {\n    let foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      let found = true\n      for (let j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  const remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  const strLen = string.length\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  let i\n  for (i = 0; i < length; ++i) {\n    const parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (numberIsNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset >>> 0\n    if (isFinite(length)) {\n      length = length >>> 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  const remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return asciiWrite(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  const res = []\n\n  let i = start\n  while (i < end) {\n    const firstByte = buf[i]\n    let codePoint = null\n    let bytesPerSequence = (firstByte > 0xEF)\n      ? 4\n      : (firstByte > 0xDF)\n          ? 3\n          : (firstByte > 0xBF)\n              ? 2\n              : 1\n\n    if (i + bytesPerSequence <= end) {\n      let secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nconst MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  const len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  let res = ''\n  let i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  const len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  let out = ''\n  for (let i = start; i < end; ++i) {\n    out += hexSliceLookupTable[buf[i]]\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  const bytes = buf.slice(start, end)\n  let res = ''\n  // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)\n  for (let i = 0; i < bytes.length - 1; i += 2) {\n    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  const len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  const newBuf = this.subarray(start, end)\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(newBuf, Buffer.prototype)\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUintLE =\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUintBE =\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  let val = this[offset + --byteLength]\n  let mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUint8 =\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUint16LE =\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUint16BE =\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUint32LE =\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUint32BE =\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const lo = first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24\n\n  const hi = this[++offset] +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    last * 2 ** 24\n\n  return BigInt(lo) + (BigInt(hi) << BigInt(32))\n})\n\nBuffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const hi = first * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  const lo = this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last\n\n  return (BigInt(hi) << BigInt(32)) + BigInt(lo)\n})\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let i = byteLength\n  let mul = 1\n  let val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = this[offset + 4] +\n    this[offset + 5] * 2 ** 8 +\n    this[offset + 6] * 2 ** 16 +\n    (last << 24) // Overflow\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24)\n})\n\nBuffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = (first << 24) + // Overflow\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last)\n})\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUintLE =\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let mul = 1\n  let i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUintBE =\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUint8 =\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeUint16LE =\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint16BE =\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint32LE =\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset + 3] = (value >>> 24)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 1] = (value >>> 8)\n  this[offset] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeUint32BE =\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nfunction wrtBigUInt64LE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  return offset\n}\n\nfunction wrtBigUInt64BE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset + 7] = lo\n  lo = lo >> 8\n  buf[offset + 6] = lo\n  lo = lo >> 8\n  buf[offset + 5] = lo\n  lo = lo >> 8\n  buf[offset + 4] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset + 3] = hi\n  hi = hi >> 8\n  buf[offset + 2] = hi\n  hi = hi >> 8\n  buf[offset + 1] = hi\n  hi = hi >> 8\n  buf[offset] = hi\n  return offset + 8\n}\n\nBuffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = 0\n  let mul = 1\n  let sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  let sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 3] = (value >>> 24)\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nBuffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  const len = end - start\n\n  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {\n    // Use built-in when available, missing from IE11\n    this.copyWithin(targetStart, start, end)\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, end),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n    if (val.length === 1) {\n      const code = val.charCodeAt(0)\n      if ((encoding === 'utf8' && code < 128) ||\n          encoding === 'latin1') {\n        // Fast path: If `val` fits into a single byte, use that numeric value.\n        val = code\n      }\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  } else if (typeof val === 'boolean') {\n    val = Number(val)\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  let i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    const bytes = Buffer.isBuffer(val)\n      ? val\n      : Buffer.from(val, encoding)\n    const len = bytes.length\n    if (len === 0) {\n      throw new TypeError('The value \"' + val +\n        '\" is invalid for argument \"value\"')\n    }\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// CUSTOM ERRORS\n// =============\n\n// Simplified versions from Node, changed for Buffer-only usage\nconst errors = {}\nfunction E (sym, getMessage, Base) {\n  errors[sym] = class NodeError extends Base {\n    constructor () {\n      super()\n\n      Object.defineProperty(this, 'message', {\n        value: getMessage.apply(this, arguments),\n        writable: true,\n        configurable: true\n      })\n\n      // Add the error code to the name to include it in the stack trace.\n      this.name = `${this.name} [${sym}]`\n      // Access the stack to generate the error message including the error code\n      // from the name.\n      this.stack // eslint-disable-line no-unused-expressions\n      // Reset the name to the actual name.\n      delete this.name\n    }\n\n    get code () {\n      return sym\n    }\n\n    set code (value) {\n      Object.defineProperty(this, 'code', {\n        configurable: true,\n        enumerable: true,\n        value,\n        writable: true\n      })\n    }\n\n    toString () {\n      return `${this.name} [${sym}]: ${this.message}`\n    }\n  }\n}\n\nE('ERR_BUFFER_OUT_OF_BOUNDS',\n  function (name) {\n    if (name) {\n      return `${name} is outside of buffer bounds`\n    }\n\n    return 'Attempt to access memory outside buffer bounds'\n  }, RangeError)\nE('ERR_INVALID_ARG_TYPE',\n  function (name, actual) {\n    return `The \"${name}\" argument must be of type number. Received type ${typeof actual}`\n  }, TypeError)\nE('ERR_OUT_OF_RANGE',\n  function (str, range, input) {\n    let msg = `The value of \"${str}\" is out of range.`\n    let received = input\n    if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {\n      received = addNumericalSeparator(String(input))\n    } else if (typeof input === 'bigint') {\n      received = String(input)\n      if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {\n        received = addNumericalSeparator(received)\n      }\n      received += 'n'\n    }\n    msg += ` It must be ${range}. Received ${received}`\n    return msg\n  }, RangeError)\n\nfunction addNumericalSeparator (val) {\n  let res = ''\n  let i = val.length\n  const start = val[0] === '-' ? 1 : 0\n  for (; i >= start + 4; i -= 3) {\n    res = `_${val.slice(i - 3, i)}${res}`\n  }\n  return `${val.slice(0, i)}${res}`\n}\n\n// CHECK FUNCTIONS\n// ===============\n\nfunction checkBounds (buf, offset, byteLength) {\n  validateNumber(offset, 'offset')\n  if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {\n    boundsError(offset, buf.length - (byteLength + 1))\n  }\n}\n\nfunction checkIntBI (value, min, max, buf, offset, byteLength) {\n  if (value > max || value < min) {\n    const n = typeof min === 'bigint' ? 'n' : ''\n    let range\n    if (byteLength > 3) {\n      if (min === 0 || min === BigInt(0)) {\n        range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`\n      } else {\n        range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +\n                `${(byteLength + 1) * 8 - 1}${n}`\n      }\n    } else {\n      range = `>= ${min}${n} and <= ${max}${n}`\n    }\n    throw new errors.ERR_OUT_OF_RANGE('value', range, value)\n  }\n  checkBounds(buf, offset, byteLength)\n}\n\nfunction validateNumber (value, name) {\n  if (typeof value !== 'number') {\n    throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)\n  }\n}\n\nfunction boundsError (value, length, type) {\n  if (Math.floor(value) !== value) {\n    validateNumber(value, type)\n    throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)\n  }\n\n  if (length < 0) {\n    throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()\n  }\n\n  throw new errors.ERR_OUT_OF_RANGE(type || 'offset',\n                                    `>= ${type ? 1 : 0} and <= ${length}`,\n                                    value)\n}\n\n// HELPER FUNCTIONS\n// ================\n\nconst INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node takes equal signs as end of the Base64 encoding\n  str = str.split('=')[0]\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = str.trim().replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  let codePoint\n  const length = string.length\n  let leadSurrogate = null\n  const bytes = []\n\n  for (let i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  let c, hi, lo\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  let i\n  for (i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\n// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass\n// the `instanceof` check but they should be treated as of that type.\n// See: https://github.com/feross/buffer/issues/166\nfunction isInstance (obj, type) {\n  return obj instanceof type ||\n    (obj != null && obj.constructor != null && obj.constructor.name != null &&\n      obj.constructor.name === type.name)\n}\nfunction numberIsNaN (obj) {\n  // For IE11 support\n  return obj !== obj // eslint-disable-line no-self-compare\n}\n\n// Create lookup table for `toString('hex')`\n// See: https://github.com/feross/buffer/issues/219\nconst hexSliceLookupTable = (function () {\n  const alphabet = '0123456789abcdef'\n  const table = new Array(256)\n  for (let i = 0; i < 16; ++i) {\n    const i16 = i * 16\n    for (let j = 0; j < 16; ++j) {\n      table[i16 + j] = alphabet[i] + alphabet[j]\n    }\n  }\n  return table\n})()\n\n// Return not function with Error if BigInt not supported\nfunction defineBigIntMethod (fn) {\n  return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn\n}\n\nfunction BufferBigIntNotDefined () {\n  throw new Error('BigInt not supported')\n}\n","import { Buffer } from 'buffer/index.js'\nexport { Buffer } // for iife reference MBP.Buffer\nconst encoder = new TextEncoder()\nconst decoder = new TextDecoder()\n\n\nexport const NB = numberBuffer\nexport function numberBuffer(type, initValue = 0) {\n  let buffer\n  if (type === undefined || typeof type !== 'string' || typeof initValue !== 'number') {\n    throw TypeError('invlaid init variablie type name. ')\n  }\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    buffer = Buffer.alloc(1)\n    if (type.includes('I')) buffer.writeInt8(initValue)\n    else buffer.writeUint8(initValue)\n  } else if (type.includes('16')) {\n    buffer = Buffer.alloc(2)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt16LE(initValue)\n      else buffer.writeInt16BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint16LE(initValue)\n      else buffer.writeUint16BE(initValue)\n    }\n  } else if (type.includes('32')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt32LE(initValue)\n      else buffer.writeInt32BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint32LE(initValue)\n      else buffer.writeUint32BE(initValue)\n    }\n  } else if (type.includes('F')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('L')) {\n      buffer.writeFloatLE(initValue)\n    } else {\n      buffer.writeFloatBE(initValue)\n    }\n  } else if (type.includes('N')) { // number as string\n    buffer = Buffer.from(String(initValue))\n  } else {\n    console.log(`invalid type: ${type} or initvalue: ${initValue}`)\n  }\n  return buffer\n}\n\n\nexport const MB = metaBuffer\nexport function metaBuffer(name, typeOrData, initValue) {\n  let buffer\n  let bufferType = 'B'\n  if (typeof typeOrData === 'number') {\n    if (typeof initValue === 'number') {  // initValue 0 should be passed.\n      buffer = Buffer.alloc(typeOrData)\n      if( initValue !== 0) buffer.fill(initValue)\n      bufferType = 'B'\n    } else {\n      buffer = Buffer.from(String(typeOrData))\n      bufferType = 'N'\n    }\n  } else if (typeof typeOrData === 'string' && typeof initValue === 'number') { // number with type.\n    bufferType = typeOrData.toUpperCase() // use explicit type name\n    buffer = numberBuffer(typeOrData, initValue) // notice.  two categories.  n: number string.  8, 16, 32: typed number.\n  } else if (typeof typeOrData === 'string' && initValue === undefined) { //  string buffer\n    buffer = Buffer.from(typeOrData)\n    bufferType = 'S'\n  } else if (typeOrData instanceof Uint8Array && initValue === undefined) { // buffer | Uint8Array\n    // Buffer.from:  Copies the passed buffer data onto a new Buffer instance.\n    // typecasting Uint8Array to Buffer.\n    buffer = (typeOrData instanceof Buffer) ? typeOrData : Buffer.from(typeOrData)\n  } else if (typeOrData instanceof ArrayBuffer && initValue === undefined) { // arrayBuffer\n    // Notice. typedArray is recommended instead of arrayBuffer\n    buffer = Buffer.from(typeOrData)\n  } else if (ArrayBuffer.isView(typeOrData)) { // typedarray buffer\n    buffer = Buffer.from(typeOrData.buffer, typeOrData.byteOffset, typeOrData.byteLength)\n  } else if (typeof typeOrData === 'object' && initValue === undefined) { //   object. like array. stringify\n    buffer = Buffer.from(JSON.stringify(typeOrData))\n    bufferType = 'O'\n  } else if (typeof typeOrData === 'boolean' && initValue === undefined) { //   object. like array. stringify\n    const v = typeOrData ? 1 : 0\n    buffer = Buffer.from([v])\n    bufferType = '!'\n  } else {\n    throw TypeError('invalid meta buffer type')\n  }\n\n  if (typeof name === 'string' && name.includes('#')) name = '' //\n\n  return [name, bufferType, buffer]\n}\n\nexport const MBA = metaBufferArguments\nexport function metaBufferArguments(...args) {\n  let i = 0\n  const mba = args.map(\n    data => {\n      const argsIndex = i++\n      // tip. MBA use index number as metabuffer's property name.\n      if (typeof data === 'number') {\n        // * JS's primitive Number stored as string.\n        return MB(argsIndex, 'N', data)\n      } else {\n        // typedarray, dataview, array, object, boolean\n        return MB(argsIndex, data)\n      }\n    })\n\n  return mba\n}\n\nexport function parseTypeName(type) {\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    if (type.includes('I')) {\n      return 'int8'\n    } else {\n      return 'uint8'\n    }\n  } else if (type.includes('16')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int16_le'\n      } else {\n        return 'int16_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint16_le'\n      } else {\n        return 'uint16_be'\n      }\n    }\n  } else if (type.includes('32')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int32_le'\n      } else {\n        return 'int32_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint32_le'\n      } else {\n        return 'uint32_be'\n      }\n    }\n  } else if (type.includes('F')) {\n    if (type.includes('L')) {\n      return 'float_le'\n    } else {\n      return 'float_be'\n    }\n  } else if (type === 'B') {\n    return 'buffer'\n  } else if (type === 'S') { // string or arguments\n    return 'string'\n  } else if (type === 'N') { // number encoded as string\n    return 'number'\n  } else if (type === 'O') { // object encoded string\n    return 'object'\n  } else if (type === '!') { // boolean  1:true 0:false\n    return 'boolean'\n  } else {\n    throw TypeError('invalid data type')\n  }\n\n}\n\nexport function readTypedBuffer(simpleType, buffer, offset, length) {\n\n  const type = parseTypeName(simpleType)\n\n  if (type == 'int8') return buffer.readInt8(offset)\n  else if (type === 'uint8') return buffer.readUint8(offset)\n  else if (type === 'int16_le') return buffer.readInt16LE(offset)\n  else if (type === 'int16_be') return buffer.readInt16BE(offset)\n  else if (type === 'uint16_le') return buffer.readUint16LE(offset)\n  else if (type === 'uint16_be') return buffer.readUint16BE(offset)\n  else if (type === 'int32_le') return buffer.readInt32LE(offset)\n  else if (type === 'int32_be') return buffer.readInt32BE(offset)\n  else if (type === 'uint32_le') return buffer.readUint32LE(offset)\n  else if (type === 'uint32_be') return buffer.readUint32BE(offset)\n  else if (type === 'float_le') return buffer.readFloatLE(offset)\n  else if (type === 'float_be') return buffer.readFloatBE(offset)\n\n  else if (type === 'buffer') {\n    return buffer.subarray(offset, offset + length)\n  } else if (type === 'string') {\n    const strBuffer = buffer.subarray(offset, offset + length)\n    return decoder.decode(strBuffer)\n  } else if (type === 'number') {\n    const strNumber = buffer.subarray(offset, offset + length)\n    return Number(decoder.decode(strNumber))\n  } else if (type === 'object') {\n    const objEncoded = buffer.subarray(offset, offset + length)\n    try {\n      return JSON.parse(decoder.decode(objEncoded))\n    } catch (error) {\n      console.log('err. obj parse')\n    }\n  } else if (type === 'boolean') {\n    const v = buffer.readInt8(offset)\n    return v === 1\n  } else {\n    throw TypeError('invalid data')\n  }\n}\n\nfunction flatSubArray(args) {\n  let subArr = []\n  const mainArr = args.filter(item => {\n    if (Array.isArray(item[0])) subArr = subArr.concat(item)\n    else return item\n  })\n  return mainArr.concat(subArr)\n}\n\nexport function pack(...args) {\n  const bufArr = flatSubArray(args)\n  let size = 0\n  const info = []\n  let offset = 0\n\n  bufArr.forEach(bufPack => {\n    const [name, type, data] = bufPack\n    size += data.byteLength\n\n    if (typeof name === 'number' || name.length > 0) {\n    // MBA item use number type name.\n    // MB item use string type name.   null string means omit.\n    \n    // change to store more informative meta info.  \n    info.push([name, type, offset, data.byteLength]) \n    \n    }\n    offset = size\n  })\n\n\n  let infoEncoded\n  let infoSize\n\n  if (info.length > 0) {\n    let infoStr = JSON.stringify(info)\n    // console.log('pack infoStr , size:', infoStr , infoStr.length )\n    infoEncoded = encoder.encode(infoStr)\n    infoSize = infoEncoded.byteLength\n    size = size + infoSize + 2\n  }\n\n  const buffer = Buffer.alloc(size)\n  offset = 0\n  bufArr.forEach(bufPack => {\n    const buf = bufPack[2]\n    buffer.set(buf, offset)\n    offset += buf.byteLength\n  })\n\n  if (info.length > 0) {\n    buffer.set(infoEncoded, offset)\n    const infoSizeBuff = NB('16', infoSize)\n    buffer.set(infoSizeBuff, offset + infoSize)\n    return buffer\n  } else {\n    return buffer\n  }\n}\n\n\n/**\n * unpack() will use embeded meta info from the binary pack.  \n * You can specify (optional) meta obejct. \n * (It's useful to read pure buffer data.)\n * \n * You can get the meta object from:  getFrame(pack) , meta()\n * @param {Buffer|Uint8Array} binPack binaryData\n * @param {Object} meta *OPTION*  \n * @returns {Object|undefined} success: return Object (include buffer data).   fail: return undefined\n */\nexport function unpack(binPack, meta) {\n\n  const infoArr = meta || getMeta(binPack)\n  if (!infoArr) return\n\n  const buffer = Buffer.from(binPack)\n  const binObj = {}\n  let readCounter = 0\n  infoArr.forEach(bufPack => {\n    const [name, type, offset, length] = bufPack\n    binObj[name] = readTypedBuffer(type, buffer, offset, length)\n    // console.log( '###3 len',length )\n    if( length) readCounter += length\n  })\n\n  // Can not define meta for variable size buffer \n  // unpacker support automatic property to read left(did't read) buffers.\n  // console.log(\"######, unpack: buffer \" , readCounter, buffer ,buffer.byteLength)\n  if(  meta && buffer.byteLength !== readCounter ){\n    let leftSize = buffer.byteLength - readCounter\n    // console.log('total,left buffer size', buffer.byteLength, leftSize )\n    binObj[\"$OTHERS\"] = readTypedBuffer('b', buffer, readCounter, leftSize)\n  }\n\n  // set args with values if exist.\n  let mbaIndex = 0;\n  let args = [];\n  while( binObj[mbaIndex]){\n    args.push( binObj[mbaIndex++])\n  }\n  \n  if( args.length > 0 ) {\n    binObj.args = args \n    binObj.$ = binObj.args \n  }\n\n  return binObj\n\n}\n\n\n\nexport const U8 = parseUint8Array   //alias\n/**\n * \n * @param {any} data \n * @param {Boolean} shareArrayBuffer false(default):  return new( or copied) ArrayBuffer.    true: share the input data's arrayBuffer.\n * @returns {Uint8Array}\n */\nexport function parseUint8Array(data, shareArrayBuffer = false) {\n  if (data === undefined) throw TypeError('Invalid data type: Undefined')\n  if (typeof data === 'string') {\n    return encoder.encode(data)\n  } else if (typeof data === 'number') { // number -> 1 byte uint8array(number)\n    return Uint8Array.from([data])\n  } else if (data instanceof ArrayBuffer) { // arraybuffer -> wrap uint8array(ab)\n    if (shareArrayBuffer) {\n      return new Uint8Array(data)\n    } else {\n      const originData = new Uint8Array(data)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else if (ArrayBuffer.isView(data)) { // accept Buffer too.\n    if (shareArrayBuffer) {\n      return new Uint8Array(data.buffer, data.byteOffset, data.byteLength) // DataView, TypedArray >  uint8array( use offset, length )\n    } else {\n      // new memory to protect origin arraybuffer.\n      const originData = new Uint8Array(data.buffer, data.byteOffset, data.byteLength)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else { // array, object\n    return encoder.encode(JSON.stringify(data)) // object(array.. )  > JSON.str > encode > unint8array\n  }\n}\n\nexport const B8 = parseBuffer\n\nexport function parseBuffer(data, shareArrayBuffer = false) {\n\n  const u8 = parseUint8Array(data, shareArrayBuffer)\n  if( shareArrayBuffer){\n    return Buffer.from( u8.buffer, u8.byteOffset, u8.byteLength )\n  }else{\n    return Buffer.from(u8)\n  }\n}\n\nexport const B8pack = parseBufferThenConcat\nexport function parseBufferThenConcat(...dataArray) {\n  const buffers = dataArray.map(data => parseBuffer(data))\n  return Buffer.concat( buffers)\n}\n\n\nexport const U8pack = parseUint8ThenConcat // alias\n/**\n * 1. parse list of data into U8 list\n * 2. return new Uint8Array merged.\n * @param  {...any} dataArray \n * @returns \n */\nexport function parseUint8ThenConcat(...dataArray) {\n  try {\n    let bufferSize = 0\n    let offset = 0\n    const buffers = dataArray.map(data => parseUint8Array(data))\n    buffers.forEach(buf => { bufferSize += buf.byteLength })\n    const buffer = new Uint8Array(bufferSize)\n    buffers.forEach(buf => {\n      buffer.set(buf, offset)\n      offset += buf.byteLength\n    })\n    return buffer\n  } catch (error) {\n    console.log(error)\n  }\n}\n\nexport function hex(buffer) {\n  return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('')\n}\n\nexport function equal(buf1, buf2) {\n  if (buf1.byteLength !== buf2.byteLength) return false\n  for (let i = 0; i < buf1.byteLength; i++) {\n    if (buf1[i] !== buf2[i]) return false\n  }\n  return true\n}\n\n\n\n\nexport function getBufferSize(binPack) {\n  if (getMetaSize(binPack) === 0) {\n    return binPack.byteLength\n  } else {\n    return binPack.byteLength - getMetaSize(binPack) - TAIL_LEN\n  }\n\n}\n\n// MB and MBA \nexport function parseMetaInfo(binPack, infoSize) {\n  let info;\n  try {\n    const buffer = new Uint8Array(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoFrom = buffer.byteLength - infoSize - 2\n    const infoEncoded = buffer.subarray(infoFrom, buffer.byteLength - 2)\n    const decoded = decoder.decode(infoEncoded)\n    const info = JSON.parse(decoded)\n\n    if (!Array.isArray(info) || !Array.isArray(info[0])) return\n\n    let firstItem = info[0]\n    if (!firstItem) return\n\n    if (firstItem.length < 3) return\n    const [name, type, offset] = firstItem\n\n    if ( typeof type !== 'string' || typeof offset !== 'number') return\n\n    return info\n  } catch (error) {\n    // return undefined\n  }\n}\n\n\n/** \n * Meta buffer pack Tail:\n * binary Pack include TAIL(two bytes size) info at the end if it has JSON info.\n * not include TAIL if it has not JSON.\n */\nexport const TAIL_LEN = 2\n\n/**\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @returns {Number} last two byte value( read Uint16 bigendian )\n */\nexport function readTail(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n    if (binPack.byteLength <= TAIL_LEN) return 0\n\n    const dv = new DataView(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoSize = dv.getUint16(binPack.byteLength - TAIL_LEN)  // last 2 bytes for json-info-length.\n    return infoSize\n\n  } else {\n    // throw TypeError('invalid data type.')\n    return 0\n  }\n\n}\n\n\n// binay data pack is not always Buffer.  \n// It should accept Uint8Array binPack.\n// This function don't use Buffer method.\n\nexport function getMetaSize(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n\n    const size = binPack.byteLength\n    if (size <= TAIL_LEN) return 0\n\n    //1. tail size check\n    const infoSize = readTail(binPack)\n    if (infoSize === 0 || infoSize > size) return 0\n    //2. try parse JSON \n    const success = parseMetaInfo(binPack, infoSize)\n    //3. return success: jsonInfoSize,  fail: 0\n    if (success) return infoSize\n    else return 0\n  }else{\n    return 0\n  }\n}\n\n\n/**\n * \n * @param {Buffer|Uint8Array} binPack \n * @returns {Buffer} \n */\nexport function getBuffer(binPack) {\n  const rawBufferSize = getBufferSize(binPack)\n  return binPack.subarray(0, rawBufferSize)\n}\n\n\n\n/**\n * extract Meta info object if it has.\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @param {Boolean} showDetail add additional item info: full data type name and bytelength.\n * @returns {Object|undefined} success: return MetaInfo Object.   fail: return undefined.(No valid JSON included.)\n */\nexport function getMeta(binPack, showDetail = false) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  const infoSize = readTail(binPack)\n  if (infoSize === 0) return\n\n  // check valid Meta\n  let metaInfo = parseMetaInfo(binPack, infoSize)\n  if (!metaInfo) return\n\n  if (!showDetail) {\n    return metaInfo\n  } else {\n    // add additional info\n    metaInfo.forEach(bufPack => {\n      const len = bufPack[3]\n      if (len == undefined) {  // add size info.\n        if (bufPack[1].includes('8')) bufPack[3] = 1\n        else if (bufPack[1].includes('16')) bufPack[3] = 2\n        else if (bufPack[1].includes('32')) bufPack[3] = 4\n        else if (bufPack[1].includes('F')) bufPack[3] = 4\n        else if (bufPack[1].includes('!')) bufPack[3] = 1\n      }\n      bufPack[4] = parseTypeName(bufPack[1])  // add full-type-name.\n    })\n    return metaInfo\n  }\n}\n\nexport function rawPack( ...args){\n  return getBuffer( pack(...args) )\n}\n\nexport function meta( ...args){\n  return getMeta( pack(...args) )\n}\n\nexport function metaDetail( ...args){\n  return getMeta( pack(...args) , true)\n}\n\n\n\nexport function getMetaDetail(binPack) {\n  return getMeta(binPack, true)\n}\n","import { hash as sha256, hmac } from '../lib/fast-sha256.js'\nimport { MBP } from 'meta-buffer-pack'\n\nsha256.hash = function (data) {\n  return sha256(MBP.U8(data))\n}\n\nsha256.hex = function (data) {\n  return MBP.hex(sha256.hash(data))\n}\n\nsha256.hmac = function (key, data) {\n  return hmac(MBP.U8(key), MBP.U8(data))\n}\n\nexport { sha256 }\n","import{ MBP, Buffer} from \"meta-buffer-pack\"\nconst MB = MBP.MB\n\n\n// remocon message pack one byte header. \nexport let BohoMsg = {\n  AUTH_REQ : 0xB0,  \n  AUTH_NONCE: 0xB1,\n  AUTH_HMAC: 0xB2,\n  AUTH_ACK: 0xB3,\n  AUTH_FAIL: 0xB4,\n  AUTH_EXT: 0xB5,\n  ENC_PACK : 0xB6,  \n  ENC_E2E : 0xB7,  \n  ENC_488 : 0xB8\n}\n\nfor (let c in BohoMsg) { BohoMsg[BohoMsg[c]] = c }\n\nexport const Meta = {\n\n  AUTH_REQ: MBP.meta(  // 2\n    MB('header','8', 0),\n    MB('reserved','8', 0)\n  ),\n\n  AUTH_NONCE: MBP.meta(  // 13\n    MB('header','8', 0),\n    MB('unixTime','32L', 0),\n    MB('milTime','32L', 0 ),\n    MB('nonce', Buffer.alloc(4))\n  ),\n\n  AUTH_HMAC: MBP.meta( // 45\n    MB('header','8', 0),\n    MB('id8',Buffer.alloc(8)),\n    MB('nonce', Buffer.alloc(4)),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n  AUTH_ACK: MBP.meta( // 33\n    MB('header','8', 0),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n\n  ENC_PACK: MBP.meta(  //25 + payload\n    MB('type','8',0),\n    MB('len','32L',0),  // pure xdata size.  \n    MB('salt12', Buffer.alloc(12)),  // sec,mil,rand\n    MB('hmac',8,0)\n    // MB( 'xdata', encData )\n    ),\n\n\n  ENC_488: MBP.meta(   // 21 + payload\n    MB('type','8', 0 ),\n    MB('len','32L', 0 ),\n    MB('otpSrc8', Buffer.alloc(8) ),\n    MB('hmac8', Buffer.alloc(8) )\n    // MB('xdata', encData ) \n    )\n\n\n  }\n\n\n  function getMetaSize(meta){\n    let lastItem = meta[ meta.length - 1]\n    return lastItem[2] + lastItem[3]\n  }\n\n  export const MetaSize = {\n    AUTH_REQ: getMetaSize( Meta.AUTH_REQ ),\n    AUTH_NONCE: getMetaSize( Meta.AUTH_NONCE ),\n    AUTH_HMAC: getMetaSize( Meta.AUTH_HMAC ),\n    AUTH_ACK: getMetaSize( Meta.AUTH_ACK ),\n    ENC_PACK: getMetaSize( Meta.ENC_PACK ),\n    ENC_488: getMetaSize( Meta.ENC_488 )\n  }\n\n// console.log( 'boho MetaSize', MetaSize )\n// boho MetaSize {\n//   AUTH_REQ: 2,\n//   AUTH_NONCE: 13,\n//   AUTH_HMAC: 45,\n//   AUTH_ACK: 33,\n//   ENC_PACK: 25,\n//   ENC_488: 21\n// }","import { sha256 } from './sha256-mbp.js'\nimport { MBP, Buffer } from 'meta-buffer-pack'\nexport { sha256, MBP, Buffer }\n\nimport { webcrypto } from 'crypto'\nimport { BohoMsg, Meta, MetaSize } from \"./constants.js\"\nexport { BohoMsg, Meta, MetaSize }\n\nlet isNode = false\ntry {\n  isNode = Object.prototype.toString.call(global.process) === '[object process]'\n} catch (e) { }\n\n\nexport function RAND(size) {\n  if( isNode ){\n    return webcrypto.getRandomValues(Buffer.alloc(size))\n  }else{\n    return self.crypto.getRandomValues(Buffer.alloc(size))\n  }\n}\n\n\n\nexport class Boho {\n  // A. Core\n  constructor() {\n\n    this._id8 = Buffer.alloc(8)\n    this._otpSrc44 = Buffer.alloc(44)\n    this._otp36 = Buffer.alloc(36)\n    this._hmac = Buffer.alloc(32)\n\n    this.auth_salt12 = Buffer.alloc(12)\n    this.localNonce = Buffer.alloc(4)\n    this.remoteNonce = Buffer.alloc(4)\n    this.isAuthorized = false\n\n  }\n\n  clearAuth(){\n    this._id8.fill(0)\n    this._otpSrc44.fill(0)\n    this._otp36.fill(0)\n    this._hmac.fill(0)\n    this.auth_salt12.fill(0)\n    this.localNonce.fill(0)\n    this.remoteNonce.fill(0)\n    this.isAuthorized = false\n  }\n\n  // for the self\n  set_id8(data) {\n    let encStr = MBP.B8(data)\n    this._id8.fill(0)\n    encStr.copy(this._id8, 0, 0, 8)\n  }\n\n  set_hash_id8(data) {\n    let idSum = MBP.B8(sha256.hash(data))\n    idSum.copy(this._id8, 0, 0, 8)\n  }\n\n\n  set_key(data) {\n    let keySum = MBP.B8(sha256.hash(data))\n    keySum.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n  // for the remote client.\n  copy_id8(data) {\n    data.copy(this._id8, 0, 0, 8)\n  }\n\n  // for the remote client.\n  copy_key(data) {\n    data.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n\n  sha256_n(srcData, n) {\n    let hashSum = sha256.hash(srcData)\n    for (let i = 0; i < n; i++) hashSum = sha256.hash(hashSum)\n    return hashSum\n  }\n\n\n  // useful general encryption  i.e. enc_pack\n  set_clock_rand() {\n\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      RAND(4)\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  // for secure communication sender. \n  set_clock_nonce(nonce) {\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      nonce\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n\n  set_salt12(salt12) {\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  resetOTP() {\n    let otp32 = MBP.B8(sha256.hash(this._otpSrc44))\n    otp32.copy(this._otp36, 0, 0, 32)\n  }\n\n  getIndexOTP(otpIndex) {\n    this._otp36.writeUInt32LE(otpIndex, 32)\n    return sha256.hash(this._otp36)\n  }\n\n\n  generateHMAC(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n  }\n\n  // return 8 bytes of hash\n  getHMAC8(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n    return this._hmac.subarray(0, 8)\n  }\n\n  xotp(data, otpStartIndex = 0, shareDataBuffer = false) {\n\n    data = MBP.B8(data, shareDataBuffer)\n\n    let len = data.byteLength\n    let otpIndex = otpStartIndex\n    let dataOffset = 0\n    let xorCalcLen = 0\n\n    while (len > 0) {\n      xorCalcLen = len < 32 ? len : 32\n      let iotp = this.getIndexOTP(++otpIndex);\n      for (let i = 0; i < xorCalcLen; i++) {\n        data[dataOffset++] ^= iotp[i]\n      }\n      len -= 32\n    }\n    return data\n  }\n\n  // B. AUTH process\n\n  // step 1\n  // client send AUTH_REQ\n  auth_req() {\n    return MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.AUTH_REQ),\n      MBP.MB('#reserved', '8', 0)\n    )\n  }\n\n  // step 2\n  // server send AUTH_NONCE\n  auth_nonce() {\n    let now = Date.now()\n    let unixTime = Math.floor(now / 1000)\n    let milTime = now % 1000\n    this.localNonce = RAND(4)\n    this.auth_salt12 = Buffer.concat([\n     MBP.NB('32L', unixTime),\n     MBP.NB('32L', milTime),\n      this.localNonce\n    ])\n\n    let infoPack = Buffer.concat([\n     MBP.NB('8', BohoMsg.AUTH_NONCE),\n      this.auth_salt12\n    ])\n    return infoPack\n  }\n\n\n  // step 3\n  // client send AUTH_HMAC\n  // input :  auth_nonce buffer\n  auth_hmac(buffer) {\n    let auth_nonce = MBP.unpack(buffer, Meta.AUTH_NONCE)\n    if (auth_nonce) {\n      // console.log(' auth nonce', auth_nonce )\n\n      // let now = Date.now()\n      // let localUTC= Math.floor( now/ 1000 )\n      // let localMilTime = now % 1000\n\n      // console.log('time server [sec]', auth_nonce.unixTime, auth_nonce.milTime )\n      // console.log('time client [sec]', localUTC , localMilTime )\n      // console.log('time diff client and server[sec]', auth_nonce.unixTime - localUTC )\n\n      // let serverSecMil = auth_nonce.unixTime * 1000 + auth_nonce.milTime\n      // console.log('time diff msec client and server[msec]', serverSecMil - now )\n\n      let salt12 = Buffer.concat([\n       MBP.NB('32L', auth_nonce.unixTime),\n       MBP.NB('32L', auth_nonce.milTime),\n        auth_nonce.nonce\n      ])\n\n      this.set_salt12(salt12)\n\n      this.localNonce = RAND(4)\n      // hmac( key, sec,mil,serverNonce, localNonce)\n      this.generateHMAC(this.localNonce)\n\n      // let hmac8 = this._hmac.subarray(0, 8)\n\n      this.remoteNonce = auth_nonce.nonce\n\n      let auth_hmac_buffer = MBP.pack( // 21 -> 45\n       MBP.MB('#header', '8', BohoMsg.AUTH_HMAC),\n       MBP.MB('#id8', this._id8),\n       MBP.MB('#nonce', this.localNonce),\n       MBP.MB('#hmac32', this._hmac ), //full 32bytes hash\n      )\n\n      return auth_hmac_buffer\n    }\n    return false\n  }\n\n  /*  \n      step 4.  for server\n  \n      step 4-1. check client's auth_hmac\n      step 4-2. reply result\n          send AUTH_ACK  with another HMAC for client.\n          or send AUTH_FAIL when fail.\n   */\n\n  // input: unpack object or buffer of auth_hmac\n  check_auth_hmac(data) {\n    let infoPack\n    if (data instanceof Uint8Array) {\n      infoPack = MBP.unpack(data, Meta.AUTH_HMAC)\n      if (!infoPack) {\n        // console.log('auth_hamc unpack fail.')\n        return\n      }\n    } else {\n      infoPack = data;\n\n    }\n    // console.log('auth_hamc infoObj', infoPack )\n\n    this.set_salt12(this.auth_salt12)\n\n    // hmac( key, sec,mil,serverNonce, clientNonce)\n    this.generateHMAC(infoPack.nonce)\n    // let hmac8 = this._hmac.subarray(0, 8)\n    let hmac32 = this._hmac\n\n    if (MBP.equal(infoPack.hmac32, hmac32)) {\n      //Auth success then store client nonce.\n      this.remoteNonce = infoPack.nonce\n\n      let salt12 = Buffer.concat([\n        this.localNonce,\n        this.remoteNonce,\n        this.localNonce\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(infoPack.nonce)\n      let replyHMAC = this._hmac\n\n      let auth_ack = MBP.rawPack( \n       MBP.MB('header', '8', BohoMsg.AUTH_ACK),\n       MBP.MB('hmac32', replyHMAC)\n      )\n      this.isAuthorized = true\n      return auth_ack\n    }\n    return false\n  }\n\n\n\n  // step 5.  cross check\n  // client check server's hmac.  \n  check_auth_ack_hmac(buffer) {\n    // server response has hmac ( key + clientNonce)\n    let auth_ack = MBP.unpack(buffer, Meta.AUTH_ACK)\n    if (auth_ack) {\n      let salt12 = Buffer.concat([\n        this.remoteNonce,\n        this.localNonce,\n        this.remoteNonce,\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(this.localNonce)\n      // let hmac8 = this._hmac.subarray(0, 8)\n      let hmac32 = this._hmac\n      //server side hmac using client nonce.\n      if (MBP.equal(hmac32, auth_ack.hmac32)) {\n        this.isAuthorized = true\n        return true\n      }\n    }\n    // server hmac error\n    return\n  }\n\n  // C. Secure Communication\n\n  // Must AUTH first.\n  encrypt_488(data) {  // payload max about 2^32 bytes.\n    if (!this.isAuthorized) return\n\n    data = MBP.B8(data)\n\n    this.set_clock_nonce(this.remoteNonce)\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_488),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#otpSrc8', this._otpSrc44.subarray(32, 40)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    // console.log('enc pack result', pack )\n    return pack\n  }\n\n\n  decrypt_488(data) {\n    data = MBP.B8(data)\n\n    let pack = MBP.unpack(data, Meta.ENC_488)\n\n    if (pack) {\n\n      let salt12 = Buffer.concat([\n        pack.otpSrc8,\n        this.localNonce\n      ])\n\n      this.set_salt12(salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS.subarray(0, pack.len)\n      let decData = this.xotp(xdata)\n\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(hmac8, pack.hmac8)) return decData\n\n      // console.log('hmac dismatch', decData )\n    } else {\n      // console.log('unpack fail')\n    }\n  }\n\n\n  // maxium data size is 2**32 -1 bytes.\n  encryptPack(data) {\n    data = MBP.B8(data)\n\n    this.set_clock_rand()\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_PACK),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#salt12', this._otpSrc44.subarray(32)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    return pack\n  }\n\n\n  decryptPack(data) {\n\n    if (data[0] !== BohoMsg.ENC_PACK) {\n      // console.log('Boho: Invalid packType')\n      return\n    }\n\n    // packLength\n    let readPackLen = data.readUint32LE(1);\n    if (readPackLen != data.byteLength - MetaSize.ENC_PACK) {\n      // console.log('Boho: Invalid LEN data_len: data.byteLen' , readPackLen, data.byteLength)\n      return\n    }\n\n    try {\n      let pack = MBP.unpack(data, Meta.ENC_PACK)\n      //  console.log('unpack result', pack )\n      if (!pack) return\n\n      this.set_salt12(pack.salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS\n      let decData = this.xotp(xdata)\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(pack.hmac, hmac8)) {\n        pack.data = decData\n        return pack\n      }\n      // console.log('Invalid HMAC', pack.hmac, hmac8 )\n\n    } catch (error) {\n      // console.log('Boho: unpack err', error )\n\n    }\n  }\n\n  encrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let pack = this.encryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return pack;\n  }\n\n  decrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let decPack = this.decryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return decPack\n  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\ No newline at end of file
+{"version":3,"file":"boho.esm.js","sources":["../lib/fast-sha256.js","../node_modules/base64-js/index.js","../node_modules/ieee754/index.js","../node_modules/buffer/index.js","../node_modules/meta-buffer-pack/src/meta-buffer-pack.js","../src/sha256-mbp.js","../src/constants.js","../src/boho.js"],"sourcesContent":["// SHA-256 (+ HMAC and PBKDF2) for JavaScript.\n//\n// Written in 2014-2016 by Dmitry Chestnykh.\n// Public domain, no warranty.\n//\n// Functions (accept and return Uint8Arrays):\n//\n//   sha256(message) -> hash\n//   sha256.hmac(key, message) -> mac\n//   sha256.pbkdf2(password, salt, rounds, dkLen) -> dk\n//\n//  Classes:\n//\n//   new sha256.Hash()\n//   new sha256.HMAC(key)\n//\nexport var digestLength = 32\nexport var blockSize = 64\n// SHA-256 constants\nconst K = new Uint32Array([\n  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,\n  0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,\n  0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,\n  0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,\n  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,\n  0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,\n  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,\n  0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\n  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,\n  0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,\n  0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,\n  0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,\n  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\n])\nfunction hashBlocks (w, v, p, pos, len) {\n  let a, b, c, d, e, f, g, h, u, i, j, t1, t2\n  while (len >= 64) {\n    a = v[0]\n    b = v[1]\n    c = v[2]\n    d = v[3]\n    e = v[4]\n    f = v[5]\n    g = v[6]\n    h = v[7]\n    for (i = 0; i < 16; i++) {\n      j = pos + i * 4\n      w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |\n                ((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff))\n    }\n    for (i = 16; i < 64; i++) {\n      u = w[i - 2]\n      t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10)\n      u = w[i - 15]\n      t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3)\n      w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0)\n    }\n    for (i = 0; i < 64; i++) {\n      t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^\n                (e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +\n                ((h + ((K[i] + w[i]) | 0)) | 0)) | 0\n      t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^\n                (a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 0\n      h = g\n      g = f\n      f = e\n      e = (d + t1) | 0\n      d = c\n      c = b\n      b = a\n      a = (t1 + t2) | 0\n    }\n    v[0] += a\n    v[1] += b\n    v[2] += c\n    v[3] += d\n    v[4] += e\n    v[5] += f\n    v[6] += g\n    v[7] += h\n    pos += 64\n    len -= 64\n  }\n  return pos\n}\n// Hash implements SHA256 hash algorithm.\nconst Hash = /** @class */ (function () {\n  function Hash () {\n    this.digestLength = digestLength\n    this.blockSize = blockSize\n    // Note: Int32Array is used instead of Uint32Array for performance reasons.\n    this.state = new Int32Array(8) // hash state\n    this.temp = new Int32Array(64) // temporary state\n    this.buffer = new Uint8Array(128) // buffer for data to hash\n    this.bufferLength = 0 // number of bytes in buffer\n    this.bytesHashed = 0 // number of total bytes hashed\n    this.finished = false // indicates whether the hash was finalized\n    this.reset()\n  }\n  // Resets hash state making it possible\n  // to re-use this instance to hash other data.\n  Hash.prototype.reset = function () {\n    this.state[0] = 0x6a09e667\n    this.state[1] = 0xbb67ae85\n    this.state[2] = 0x3c6ef372\n    this.state[3] = 0xa54ff53a\n    this.state[4] = 0x510e527f\n    this.state[5] = 0x9b05688c\n    this.state[6] = 0x1f83d9ab\n    this.state[7] = 0x5be0cd19\n    this.bufferLength = 0\n    this.bytesHashed = 0\n    this.finished = false\n    return this\n  }\n  // Cleans internal buffers and re-initializes hash state.\n  Hash.prototype.clean = function () {\n    for (var i = 0; i < this.buffer.length; i++) {\n      this.buffer[i] = 0\n    }\n    for (var i = 0; i < this.temp.length; i++) {\n      this.temp[i] = 0\n    }\n    this.reset()\n  }\n  // Updates hash state with the given data.\n  //\n  // Optionally, length of the data can be specified to hash\n  // fewer bytes than data.length.\n  //\n  // Throws error when trying to update already finalized hash:\n  // instance must be reset to use it again.\n  Hash.prototype.update = function (data, dataLength) {\n    if (dataLength === void 0) { dataLength = data.length }\n    if (this.finished) {\n      throw new Error(\"SHA256: can't update because hash was finished.\")\n    }\n    let dataPos = 0\n    this.bytesHashed += dataLength\n    if (this.bufferLength > 0) {\n      while (this.bufferLength < 64 && dataLength > 0) {\n        this.buffer[this.bufferLength++] = data[dataPos++]\n        dataLength--\n      }\n      if (this.bufferLength === 64) {\n        hashBlocks(this.temp, this.state, this.buffer, 0, 64)\n        this.bufferLength = 0\n      }\n    }\n    if (dataLength >= 64) {\n      dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength)\n      dataLength %= 64\n    }\n    while (dataLength > 0) {\n      this.buffer[this.bufferLength++] = data[dataPos++]\n      dataLength--\n    }\n    return this\n  }\n  // Finalizes hash state and puts hash into out.\n  //\n  // If hash was already finalized, puts the same value.\n  Hash.prototype.finish = function (out) {\n    if (!this.finished) {\n      const bytesHashed = this.bytesHashed\n      const left = this.bufferLength\n      const bitLenHi = (bytesHashed / 0x20000000) | 0\n      const bitLenLo = bytesHashed << 3\n      const padLength = (bytesHashed % 64 < 56) ? 64 : 128\n      this.buffer[left] = 0x80\n      for (var i = left + 1; i < padLength - 8; i++) {\n        this.buffer[i] = 0\n      }\n      this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff\n      this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff\n      this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff\n      this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff\n      this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff\n      this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff\n      this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff\n      this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff\n      hashBlocks(this.temp, this.state, this.buffer, 0, padLength)\n      this.finished = true\n    }\n    for (var i = 0; i < 8; i++) {\n      out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff\n      out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff\n      out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff\n      out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff\n    }\n    return this\n  }\n  // Returns the final hash digest.\n  Hash.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._saveState = function (out) {\n    for (let i = 0; i < this.state.length; i++) {\n      out[i] = this.state[i]\n    }\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._restoreState = function (from, bytesHashed) {\n    for (let i = 0; i < this.state.length; i++) {\n      this.state[i] = from[i]\n    }\n    this.bytesHashed = bytesHashed\n    this.finished = false\n    this.bufferLength = 0\n  }\n  return Hash\n}())\nexport { Hash }\n// HMAC implements HMAC-SHA256 message authentication algorithm.\nconst HMAC = /** @class */ (function () {\n  function HMAC (key) {\n    this.inner = new Hash()\n    this.outer = new Hash()\n    this.blockSize = this.inner.blockSize\n    this.digestLength = this.inner.digestLength\n    const pad = new Uint8Array(this.blockSize)\n    if (key.length > this.blockSize) {\n      (new Hash()).update(key).finish(pad).clean()\n    } else {\n      for (var i = 0; i < key.length; i++) {\n        pad[i] = key[i]\n      }\n    }\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36\n    }\n    this.inner.update(pad)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36 ^ 0x5c\n    }\n    this.outer.update(pad)\n    this.istate = new Uint32Array(8)\n    this.ostate = new Uint32Array(8)\n    this.inner._saveState(this.istate)\n    this.outer._saveState(this.ostate)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] = 0\n    }\n  }\n  // Returns HMAC state to the state initialized with key\n  // to make it possible to run HMAC over the other data with the same\n  // key without creating a new instance.\n  HMAC.prototype.reset = function () {\n    this.inner._restoreState(this.istate, this.inner.blockSize)\n    this.outer._restoreState(this.ostate, this.outer.blockSize)\n    return this\n  }\n  // Cleans HMAC state.\n  HMAC.prototype.clean = function () {\n    for (let i = 0; i < this.istate.length; i++) {\n      this.ostate[i] = this.istate[i] = 0\n    }\n    this.inner.clean()\n    this.outer.clean()\n  }\n  // Updates state with provided data.\n  HMAC.prototype.update = function (data) {\n    this.inner.update(data)\n    return this\n  }\n  // Finalizes HMAC and puts the result in out.\n  HMAC.prototype.finish = function (out) {\n    if (this.outer.finished) {\n      this.outer.finish(out)\n    } else {\n      this.inner.finish(out)\n      this.outer.update(out, this.digestLength).finish(out)\n    }\n    return this\n  }\n  // Returns message authentication code.\n  HMAC.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  return HMAC\n}())\nexport { HMAC }\n// Returns SHA256 hash of data.\nexport function hash (data) {\n  const h = (new Hash()).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Function hash is both available as module.hash and as default export.\nexport default hash\n// Returns HMAC-SHA256 of data under the key.\nexport function hmac (key, data) {\n  const h = (new HMAC(key)).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Fills hkdf buffer like this:\n// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)\nfunction fillBuffer (buffer, hmac, info, counter) {\n  // Counter is a byte value: check if it overflowed.\n  const num = counter[0]\n  if (num === 0) {\n    throw new Error('hkdf: cannot expand more')\n  }\n  // Prepare HMAC instance for new data with old key.\n  hmac.reset()\n  // Hash in previous output if it was generated\n  // (i.e. counter is greater than 1).\n  if (num > 1) {\n    hmac.update(buffer)\n  }\n  // Hash in info if it exists.\n  if (info) {\n    hmac.update(info)\n  }\n  // Hash in the counter.\n  hmac.update(counter)\n  // Output result to buffer and clean HMAC instance.\n  hmac.finish(buffer)\n  // Increment counter inside typed array, this works properly.\n  counter[0]++\n}\nconst hkdfSalt = new Uint8Array(digestLength) // Filled with zeroes.\nexport function hkdf (key, salt, info, length) {\n  if (salt === void 0) { salt = hkdfSalt }\n  if (length === void 0) { length = 32 }\n  const counter = new Uint8Array([1])\n  // HKDF-Extract uses salt as HMAC key, and key as data.\n  const okm = hmac(salt, key)\n  // Initialize HMAC for expanding with extracted key.\n  // Ensure no collisions with `hmac` function.\n  const hmac_ = new HMAC(okm)\n  // Allocate buffer.\n  const buffer = new Uint8Array(hmac_.digestLength)\n  let bufpos = buffer.length\n  const out = new Uint8Array(length)\n  for (let i = 0; i < length; i++) {\n    if (bufpos === buffer.length) {\n      fillBuffer(buffer, hmac_, info, counter)\n      bufpos = 0\n    }\n    out[i] = buffer[bufpos++]\n  }\n  hmac_.clean()\n  buffer.fill(0)\n  counter.fill(0)\n  return out\n}\n// Derives a key from password and salt using PBKDF2-HMAC-SHA256\n// with the given number of iterations.\n//\n// The number of bytes returned is equal to dkLen.\n//\n// (For better security, avoid dkLen greater than hash length - 32 bytes).\nexport function pbkdf2 (password, salt, iterations, dkLen) {\n  const prf = new HMAC(password)\n  const len = prf.digestLength\n  const ctr = new Uint8Array(4)\n  const t = new Uint8Array(len)\n  const u = new Uint8Array(len)\n  const dk = new Uint8Array(dkLen)\n  for (var i = 0; i * len < dkLen; i++) {\n    const c = i + 1\n    ctr[0] = (c >>> 24) & 0xff\n    ctr[1] = (c >>> 16) & 0xff\n    ctr[2] = (c >>> 8) & 0xff\n    ctr[3] = (c >>> 0) & 0xff\n    prf.reset()\n    prf.update(salt)\n    prf.update(ctr)\n    prf.finish(u)\n    for (var j = 0; j < len; j++) {\n      t[j] = u[j]\n    }\n    for (var j = 2; j <= iterations; j++) {\n      prf.reset()\n      prf.update(u).finish(u)\n      for (let k = 0; k < len; k++) {\n        t[k] ^= u[k]\n      }\n    }\n    for (var j = 0; j < len && i * len + j < dkLen; j++) {\n      dk[i * len + j] = t[j]\n    }\n  }\n  for (var i = 0; i < len; i++) {\n    t[i] = u[i] = 0\n  }\n  for (var i = 0; i < 4; i++) {\n    ctr[i] = 0\n  }\n  prf.clean()\n  return dk\n}\n","'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\n// Support decoding URL-safe base64 strings, as Node.js does.\n// See: https://en.wikipedia.org/wiki/Base64#URL_applications\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction getLens (b64) {\n  var len = b64.length\n\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // Trim off extra bytes after placeholder bytes are found\n  // See: https://github.com/beatgammit/base64-js/issues/42\n  var validLen = b64.indexOf('=')\n  if (validLen === -1) validLen = len\n\n  var placeHoldersLen = validLen === len\n    ? 0\n    : 4 - (validLen % 4)\n\n  return [validLen, placeHoldersLen]\n}\n\n// base64 is 4/3 + up to two characters of the original data\nfunction byteLength (b64) {\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction _byteLength (b64, validLen, placeHoldersLen) {\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction toByteArray (b64) {\n  var tmp\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n\n  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))\n\n  var curByte = 0\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  var len = placeHoldersLen > 0\n    ? validLen - 4\n    : validLen\n\n  var i\n  for (i = 0; i < len; i += 4) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 18) |\n      (revLookup[b64.charCodeAt(i + 1)] << 12) |\n      (revLookup[b64.charCodeAt(i + 2)] << 6) |\n      revLookup[b64.charCodeAt(i + 3)]\n    arr[curByte++] = (tmp >> 16) & 0xFF\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 2) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 2) |\n      (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 1) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 10) |\n      (revLookup[b64.charCodeAt(i + 1)] << 4) |\n      (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] +\n    lookup[num >> 12 & 0x3F] +\n    lookup[num >> 6 & 0x3F] +\n    lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp =\n      ((uint8[i] << 16) & 0xFF0000) +\n      ((uint8[i + 1] << 8) & 0xFF00) +\n      (uint8[i + 2] & 0xFF)\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 2] +\n      lookup[(tmp << 4) & 0x3F] +\n      '=='\n    )\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 10] +\n      lookup[(tmp >> 4) & 0x3F] +\n      lookup[(tmp << 2) & 0x3F] +\n      '='\n    )\n  }\n\n  return parts.join('')\n}\n","/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */\nexports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n","/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <https://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nconst base64 = require('base64-js')\nconst ieee754 = require('ieee754')\nconst customInspectSymbol =\n  (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation\n    ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation\n    : null\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\nconst K_MAX_LENGTH = 0x7fffffff\nexports.kMaxLength = K_MAX_LENGTH\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Print warning and recommend using `buffer` v4.x which has an Object\n *               implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * We report that the browser does not support typed arrays if the are not subclassable\n * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`\n * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support\n * for __proto__ and has a buggy typed array implementation.\n */\nBuffer.TYPED_ARRAY_SUPPORT = typedArraySupport()\n\nif (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&\n    typeof console.error === 'function') {\n  console.error(\n    'This browser lacks typed array (Uint8Array) support which is required by ' +\n    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'\n  )\n}\n\nfunction typedArraySupport () {\n  // Can typed array instances can be augmented?\n  try {\n    const arr = new Uint8Array(1)\n    const proto = { foo: function () { return 42 } }\n    Object.setPrototypeOf(proto, Uint8Array.prototype)\n    Object.setPrototypeOf(arr, proto)\n    return arr.foo() === 42\n  } catch (e) {\n    return false\n  }\n}\n\nObject.defineProperty(Buffer.prototype, 'parent', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.buffer\n  }\n})\n\nObject.defineProperty(Buffer.prototype, 'offset', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.byteOffset\n  }\n})\n\nfunction createBuffer (length) {\n  if (length > K_MAX_LENGTH) {\n    throw new RangeError('The value \"' + length + '\" is invalid for option \"size\"')\n  }\n  // Return an augmented `Uint8Array` instance\n  const buf = new Uint8Array(length)\n  Object.setPrototypeOf(buf, Buffer.prototype)\n  return buf\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new TypeError(\n        'The \"string\" argument must be of type string. Received type number'\n      )\n    }\n    return allocUnsafe(arg)\n  }\n  return from(arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\nfunction from (value, encodingOrOffset, length) {\n  if (typeof value === 'string') {\n    return fromString(value, encodingOrOffset)\n  }\n\n  if (ArrayBuffer.isView(value)) {\n    return fromArrayView(value)\n  }\n\n  if (value == null) {\n    throw new TypeError(\n      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n      'or Array-like Object. Received type ' + (typeof value)\n    )\n  }\n\n  if (isInstance(value, ArrayBuffer) ||\n      (value && isInstance(value.buffer, ArrayBuffer))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof SharedArrayBuffer !== 'undefined' &&\n      (isInstance(value, SharedArrayBuffer) ||\n      (value && isInstance(value.buffer, SharedArrayBuffer)))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'number') {\n    throw new TypeError(\n      'The \"value\" argument must not be of type number. Received type number'\n    )\n  }\n\n  const valueOf = value.valueOf && value.valueOf()\n  if (valueOf != null && valueOf !== value) {\n    return Buffer.from(valueOf, encodingOrOffset, length)\n  }\n\n  const b = fromObject(value)\n  if (b) return b\n\n  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&\n      typeof value[Symbol.toPrimitive] === 'function') {\n    return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)\n  }\n\n  throw new TypeError(\n    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n    'or Array-like Object. Received type ' + (typeof value)\n  )\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(value, encodingOrOffset, length)\n}\n\n// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:\n// https://github.com/feross/buffer/pull/148\nObject.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)\nObject.setPrototypeOf(Buffer, Uint8Array)\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be of type number')\n  } else if (size < 0) {\n    throw new RangeError('The value \"' + size + '\" is invalid for option \"size\"')\n  }\n}\n\nfunction alloc (size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpreted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(size).fill(fill, encoding)\n      : createBuffer(size).fill(fill)\n  }\n  return createBuffer(size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(size, fill, encoding)\n}\n\nfunction allocUnsafe (size) {\n  assertSize(size)\n  return createBuffer(size < 0 ? 0 : checked(size) | 0)\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(size)\n}\n\nfunction fromString (string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('Unknown encoding: ' + encoding)\n  }\n\n  const length = byteLength(string, encoding) | 0\n  let buf = createBuffer(length)\n\n  const actual = buf.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    buf = buf.slice(0, actual)\n  }\n\n  return buf\n}\n\nfunction fromArrayLike (array) {\n  const length = array.length < 0 ? 0 : checked(array.length) | 0\n  const buf = createBuffer(length)\n  for (let i = 0; i < length; i += 1) {\n    buf[i] = array[i] & 255\n  }\n  return buf\n}\n\nfunction fromArrayView (arrayView) {\n  if (isInstance(arrayView, Uint8Array)) {\n    const copy = new Uint8Array(arrayView)\n    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)\n  }\n  return fromArrayLike(arrayView)\n}\n\nfunction fromArrayBuffer (array, byteOffset, length) {\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\"offset\" is outside of buffer bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\"length\" is outside of buffer bounds')\n  }\n\n  let buf\n  if (byteOffset === undefined && length === undefined) {\n    buf = new Uint8Array(array)\n  } else if (length === undefined) {\n    buf = new Uint8Array(array, byteOffset)\n  } else {\n    buf = new Uint8Array(array, byteOffset, length)\n  }\n\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(buf, Buffer.prototype)\n\n  return buf\n}\n\nfunction fromObject (obj) {\n  if (Buffer.isBuffer(obj)) {\n    const len = checked(obj.length) | 0\n    const buf = createBuffer(len)\n\n    if (buf.length === 0) {\n      return buf\n    }\n\n    obj.copy(buf, 0, 0, len)\n    return buf\n  }\n\n  if (obj.length !== undefined) {\n    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {\n      return createBuffer(0)\n    }\n    return fromArrayLike(obj)\n  }\n\n  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {\n    return fromArrayLike(obj.data)\n  }\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= K_MAX_LENGTH) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return b != null && b._isBuffer === true &&\n    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false\n}\n\nBuffer.compare = function compare (a, b) {\n  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)\n  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError(\n      'The \"buf1\", \"buf2\" arguments must be one of type Buffer or Uint8Array'\n    )\n  }\n\n  if (a === b) return 0\n\n  let x = a.length\n  let y = b.length\n\n  for (let i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!Array.isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  let i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  const buffer = Buffer.allocUnsafe(length)\n  let pos = 0\n  for (i = 0; i < list.length; ++i) {\n    let buf = list[i]\n    if (isInstance(buf, Uint8Array)) {\n      if (pos + buf.length > buffer.length) {\n        if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)\n        buf.copy(buffer, pos)\n      } else {\n        Uint8Array.prototype.set.call(\n          buffer,\n          buf,\n          pos\n        )\n      }\n    } else if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    } else {\n      buf.copy(buffer, pos)\n    }\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    throw new TypeError(\n      'The \"string\" argument must be one of type string, Buffer, or ArrayBuffer. ' +\n      'Received type ' + typeof string\n    )\n  }\n\n  const len = string.length\n  const mustMatch = (arguments.length > 2 && arguments[2] === true)\n  if (!mustMatch && len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) {\n          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8\n        }\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  let loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)\n// to detect a Buffer instance. It's not possible to use `instanceof Buffer`\n// reliably in a browserify context because there could be multiple different\n// copies of the 'buffer' package in use. This method works even for Buffer\n// instances that were created from another copy of the `buffer` package.\n// See: https://github.com/feross/buffer/issues/154\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  const i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  const len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (let i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  const len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (let i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  const len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (let i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  const length = this.length\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.toLocaleString = Buffer.prototype.toString\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  let str = ''\n  const max = exports.INSPECT_MAX_BYTES\n  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()\n  if (this.length > max) str += ' ... '\n  return '<Buffer ' + str + '>'\n}\nif (customInspectSymbol) {\n  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (isInstance(target, Uint8Array)) {\n    target = Buffer.from(target, target.offset, target.byteLength)\n  }\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError(\n      'The \"target\" argument must be one of type Buffer or Uint8Array. ' +\n      'Received type ' + (typeof target)\n    )\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  let x = thisEnd - thisStart\n  let y = end - start\n  const len = Math.min(x, y)\n\n  const thisCopy = this.slice(thisStart, thisEnd)\n  const targetCopy = target.slice(start, end)\n\n  for (let i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset // Coerce to Number.\n  if (numberIsNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  let indexSize = 1\n  let arrLength = arr.length\n  let valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  let i\n  if (dir) {\n    let foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      let found = true\n      for (let j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  const remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  const strLen = string.length\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  let i\n  for (i = 0; i < length; ++i) {\n    const parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (numberIsNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset >>> 0\n    if (isFinite(length)) {\n      length = length >>> 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  const remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return asciiWrite(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  const res = []\n\n  let i = start\n  while (i < end) {\n    const firstByte = buf[i]\n    let codePoint = null\n    let bytesPerSequence = (firstByte > 0xEF)\n      ? 4\n      : (firstByte > 0xDF)\n          ? 3\n          : (firstByte > 0xBF)\n              ? 2\n              : 1\n\n    if (i + bytesPerSequence <= end) {\n      let secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nconst MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  const len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  let res = ''\n  let i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  const len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  let out = ''\n  for (let i = start; i < end; ++i) {\n    out += hexSliceLookupTable[buf[i]]\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  const bytes = buf.slice(start, end)\n  let res = ''\n  // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)\n  for (let i = 0; i < bytes.length - 1; i += 2) {\n    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  const len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  const newBuf = this.subarray(start, end)\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(newBuf, Buffer.prototype)\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUintLE =\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUintBE =\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  let val = this[offset + --byteLength]\n  let mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUint8 =\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUint16LE =\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUint16BE =\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUint32LE =\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUint32BE =\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const lo = first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24\n\n  const hi = this[++offset] +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    last * 2 ** 24\n\n  return BigInt(lo) + (BigInt(hi) << BigInt(32))\n})\n\nBuffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const hi = first * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  const lo = this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last\n\n  return (BigInt(hi) << BigInt(32)) + BigInt(lo)\n})\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let i = byteLength\n  let mul = 1\n  let val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = this[offset + 4] +\n    this[offset + 5] * 2 ** 8 +\n    this[offset + 6] * 2 ** 16 +\n    (last << 24) // Overflow\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24)\n})\n\nBuffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = (first << 24) + // Overflow\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last)\n})\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUintLE =\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let mul = 1\n  let i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUintBE =\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUint8 =\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeUint16LE =\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint16BE =\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint32LE =\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset + 3] = (value >>> 24)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 1] = (value >>> 8)\n  this[offset] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeUint32BE =\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nfunction wrtBigUInt64LE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  return offset\n}\n\nfunction wrtBigUInt64BE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset + 7] = lo\n  lo = lo >> 8\n  buf[offset + 6] = lo\n  lo = lo >> 8\n  buf[offset + 5] = lo\n  lo = lo >> 8\n  buf[offset + 4] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset + 3] = hi\n  hi = hi >> 8\n  buf[offset + 2] = hi\n  hi = hi >> 8\n  buf[offset + 1] = hi\n  hi = hi >> 8\n  buf[offset] = hi\n  return offset + 8\n}\n\nBuffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = 0\n  let mul = 1\n  let sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  let sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 3] = (value >>> 24)\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nBuffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  const len = end - start\n\n  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {\n    // Use built-in when available, missing from IE11\n    this.copyWithin(targetStart, start, end)\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, end),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n    if (val.length === 1) {\n      const code = val.charCodeAt(0)\n      if ((encoding === 'utf8' && code < 128) ||\n          encoding === 'latin1') {\n        // Fast path: If `val` fits into a single byte, use that numeric value.\n        val = code\n      }\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  } else if (typeof val === 'boolean') {\n    val = Number(val)\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  let i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    const bytes = Buffer.isBuffer(val)\n      ? val\n      : Buffer.from(val, encoding)\n    const len = bytes.length\n    if (len === 0) {\n      throw new TypeError('The value \"' + val +\n        '\" is invalid for argument \"value\"')\n    }\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// CUSTOM ERRORS\n// =============\n\n// Simplified versions from Node, changed for Buffer-only usage\nconst errors = {}\nfunction E (sym, getMessage, Base) {\n  errors[sym] = class NodeError extends Base {\n    constructor () {\n      super()\n\n      Object.defineProperty(this, 'message', {\n        value: getMessage.apply(this, arguments),\n        writable: true,\n        configurable: true\n      })\n\n      // Add the error code to the name to include it in the stack trace.\n      this.name = `${this.name} [${sym}]`\n      // Access the stack to generate the error message including the error code\n      // from the name.\n      this.stack // eslint-disable-line no-unused-expressions\n      // Reset the name to the actual name.\n      delete this.name\n    }\n\n    get code () {\n      return sym\n    }\n\n    set code (value) {\n      Object.defineProperty(this, 'code', {\n        configurable: true,\n        enumerable: true,\n        value,\n        writable: true\n      })\n    }\n\n    toString () {\n      return `${this.name} [${sym}]: ${this.message}`\n    }\n  }\n}\n\nE('ERR_BUFFER_OUT_OF_BOUNDS',\n  function (name) {\n    if (name) {\n      return `${name} is outside of buffer bounds`\n    }\n\n    return 'Attempt to access memory outside buffer bounds'\n  }, RangeError)\nE('ERR_INVALID_ARG_TYPE',\n  function (name, actual) {\n    return `The \"${name}\" argument must be of type number. Received type ${typeof actual}`\n  }, TypeError)\nE('ERR_OUT_OF_RANGE',\n  function (str, range, input) {\n    let msg = `The value of \"${str}\" is out of range.`\n    let received = input\n    if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {\n      received = addNumericalSeparator(String(input))\n    } else if (typeof input === 'bigint') {\n      received = String(input)\n      if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {\n        received = addNumericalSeparator(received)\n      }\n      received += 'n'\n    }\n    msg += ` It must be ${range}. Received ${received}`\n    return msg\n  }, RangeError)\n\nfunction addNumericalSeparator (val) {\n  let res = ''\n  let i = val.length\n  const start = val[0] === '-' ? 1 : 0\n  for (; i >= start + 4; i -= 3) {\n    res = `_${val.slice(i - 3, i)}${res}`\n  }\n  return `${val.slice(0, i)}${res}`\n}\n\n// CHECK FUNCTIONS\n// ===============\n\nfunction checkBounds (buf, offset, byteLength) {\n  validateNumber(offset, 'offset')\n  if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {\n    boundsError(offset, buf.length - (byteLength + 1))\n  }\n}\n\nfunction checkIntBI (value, min, max, buf, offset, byteLength) {\n  if (value > max || value < min) {\n    const n = typeof min === 'bigint' ? 'n' : ''\n    let range\n    if (byteLength > 3) {\n      if (min === 0 || min === BigInt(0)) {\n        range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`\n      } else {\n        range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +\n                `${(byteLength + 1) * 8 - 1}${n}`\n      }\n    } else {\n      range = `>= ${min}${n} and <= ${max}${n}`\n    }\n    throw new errors.ERR_OUT_OF_RANGE('value', range, value)\n  }\n  checkBounds(buf, offset, byteLength)\n}\n\nfunction validateNumber (value, name) {\n  if (typeof value !== 'number') {\n    throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)\n  }\n}\n\nfunction boundsError (value, length, type) {\n  if (Math.floor(value) !== value) {\n    validateNumber(value, type)\n    throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)\n  }\n\n  if (length < 0) {\n    throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()\n  }\n\n  throw new errors.ERR_OUT_OF_RANGE(type || 'offset',\n                                    `>= ${type ? 1 : 0} and <= ${length}`,\n                                    value)\n}\n\n// HELPER FUNCTIONS\n// ================\n\nconst INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node takes equal signs as end of the Base64 encoding\n  str = str.split('=')[0]\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = str.trim().replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  let codePoint\n  const length = string.length\n  let leadSurrogate = null\n  const bytes = []\n\n  for (let i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  let c, hi, lo\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  let i\n  for (i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\n// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass\n// the `instanceof` check but they should be treated as of that type.\n// See: https://github.com/feross/buffer/issues/166\nfunction isInstance (obj, type) {\n  return obj instanceof type ||\n    (obj != null && obj.constructor != null && obj.constructor.name != null &&\n      obj.constructor.name === type.name)\n}\nfunction numberIsNaN (obj) {\n  // For IE11 support\n  return obj !== obj // eslint-disable-line no-self-compare\n}\n\n// Create lookup table for `toString('hex')`\n// See: https://github.com/feross/buffer/issues/219\nconst hexSliceLookupTable = (function () {\n  const alphabet = '0123456789abcdef'\n  const table = new Array(256)\n  for (let i = 0; i < 16; ++i) {\n    const i16 = i * 16\n    for (let j = 0; j < 16; ++j) {\n      table[i16 + j] = alphabet[i] + alphabet[j]\n    }\n  }\n  return table\n})()\n\n// Return not function with Error if BigInt not supported\nfunction defineBigIntMethod (fn) {\n  return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn\n}\n\nfunction BufferBigIntNotDefined () {\n  throw new Error('BigInt not supported')\n}\n","import { Buffer } from 'buffer/index.js'\nexport { Buffer } // for iife reference MBP.Buffer\nconst encoder = new TextEncoder()\nconst decoder = new TextDecoder()\n\n\nexport const NB = numberBuffer\nexport function numberBuffer(type, initValue = 0) {\n  let buffer\n  if (type === undefined || typeof type !== 'string' || typeof initValue !== 'number') {\n    throw TypeError('invlaid init variablie type name. ')\n  }\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    buffer = Buffer.alloc(1)\n    if (type.includes('I')) buffer.writeInt8(initValue)\n    else buffer.writeUint8(initValue)\n  } else if (type.includes('16')) {\n    buffer = Buffer.alloc(2)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt16LE(initValue)\n      else buffer.writeInt16BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint16LE(initValue)\n      else buffer.writeUint16BE(initValue)\n    }\n  } else if (type.includes('32')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt32LE(initValue)\n      else buffer.writeInt32BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint32LE(initValue)\n      else buffer.writeUint32BE(initValue)\n    }\n  } else if (type.includes('F')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('L')) {\n      buffer.writeFloatLE(initValue)\n    } else {\n      buffer.writeFloatBE(initValue)\n    }\n  } else if (type.includes('N')) { // number as string\n    buffer = Buffer.from(String(initValue))\n  } else {\n    console.log(`invalid type: ${type} or initvalue: ${initValue}`)\n  }\n  return buffer\n}\n\n\nexport const MB = metaBuffer\nexport function metaBuffer(name, typeOrData, initValue) {\n  let buffer\n  let bufferType = 'B'\n  if (typeof typeOrData === 'number') {\n    if (typeof initValue === 'number') {  // initValue 0 should be passed.\n      buffer = Buffer.alloc(typeOrData)\n      if( initValue !== 0) buffer.fill(initValue)\n      bufferType = 'B'\n    } else {\n      buffer = Buffer.from(String(typeOrData))\n      bufferType = 'N'\n    }\n  } else if (typeof typeOrData === 'string' && typeof initValue === 'number') { // number with type.\n    bufferType = typeOrData.toUpperCase() // use explicit type name\n    buffer = numberBuffer(typeOrData, initValue) // notice.  two categories.  n: number string.  8, 16, 32: typed number.\n  } else if (typeof typeOrData === 'string' && initValue === undefined) { //  string buffer\n    buffer = Buffer.from(typeOrData)\n    bufferType = 'S'\n  } else if (typeOrData instanceof Uint8Array && initValue === undefined) { // buffer | Uint8Array\n    // Buffer.from:  Copies the passed buffer data onto a new Buffer instance.\n    // typecasting Uint8Array to Buffer.\n    buffer = (typeOrData instanceof Buffer) ? typeOrData : Buffer.from(typeOrData)\n  } else if (typeOrData instanceof ArrayBuffer && initValue === undefined) { // arrayBuffer\n    // Notice. typedArray is recommended instead of arrayBuffer\n    buffer = Buffer.from(typeOrData)\n  } else if (ArrayBuffer.isView(typeOrData)) { // typedarray buffer\n    buffer = Buffer.from(typeOrData.buffer, typeOrData.byteOffset, typeOrData.byteLength)\n  } else if (typeof typeOrData === 'object' && initValue === undefined) { //   object. like array. stringify\n    buffer = Buffer.from(JSON.stringify(typeOrData))\n    bufferType = 'O'\n  } else if (typeof typeOrData === 'boolean' && initValue === undefined) { //   object. like array. stringify\n    const v = typeOrData ? 1 : 0\n    buffer = Buffer.from([v])\n    bufferType = '!'\n  } else {\n    throw TypeError('invalid meta buffer type')\n  }\n\n  if (typeof name === 'string' && name.includes('#')) name = '' //\n\n  return [name, bufferType, buffer]\n}\n\nexport const MBA = metaBufferArguments\nexport function metaBufferArguments(...args) {\n  let i = 0\n  const mba = args.map(\n    data => {\n      const argsIndex = i++\n      // tip. MBA use index number as metabuffer's property name.\n      if (typeof data === 'number') {\n        // * JS's primitive Number stored as string.\n        return MB(argsIndex, 'N', data)\n      } else {\n        // typedarray, dataview, array, object, boolean\n        return MB(argsIndex, data)\n      }\n    })\n\n  return mba\n}\n\nexport function parseTypeName(type) {\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    if (type.includes('I')) {\n      return 'int8'\n    } else {\n      return 'uint8'\n    }\n  } else if (type.includes('16')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int16_le'\n      } else {\n        return 'int16_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint16_le'\n      } else {\n        return 'uint16_be'\n      }\n    }\n  } else if (type.includes('32')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int32_le'\n      } else {\n        return 'int32_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint32_le'\n      } else {\n        return 'uint32_be'\n      }\n    }\n  } else if (type.includes('F')) {\n    if (type.includes('L')) {\n      return 'float_le'\n    } else {\n      return 'float_be'\n    }\n  } else if (type === 'B') {\n    return 'buffer'\n  } else if (type === 'S') { // string or arguments\n    return 'string'\n  } else if (type === 'N') { // number encoded as string\n    return 'number'\n  } else if (type === 'O') { // object encoded string\n    return 'object'\n  } else if (type === '!') { // boolean  1:true 0:false\n    return 'boolean'\n  } else {\n    throw TypeError('invalid data type')\n  }\n\n}\n\nexport function readTypedBuffer(simpleType, buffer, offset, length) {\n\n  const type = parseTypeName(simpleType)\n\n  if (type == 'int8') return buffer.readInt8(offset)\n  else if (type === 'uint8') return buffer.readUint8(offset)\n  else if (type === 'int16_le') return buffer.readInt16LE(offset)\n  else if (type === 'int16_be') return buffer.readInt16BE(offset)\n  else if (type === 'uint16_le') return buffer.readUint16LE(offset)\n  else if (type === 'uint16_be') return buffer.readUint16BE(offset)\n  else if (type === 'int32_le') return buffer.readInt32LE(offset)\n  else if (type === 'int32_be') return buffer.readInt32BE(offset)\n  else if (type === 'uint32_le') return buffer.readUint32LE(offset)\n  else if (type === 'uint32_be') return buffer.readUint32BE(offset)\n  else if (type === 'float_le') return buffer.readFloatLE(offset)\n  else if (type === 'float_be') return buffer.readFloatBE(offset)\n\n  else if (type === 'buffer') {\n    return buffer.subarray(offset, offset + length)\n  } else if (type === 'string') {\n    const strBuffer = buffer.subarray(offset, offset + length)\n    return decoder.decode(strBuffer)\n  } else if (type === 'number') {\n    const strNumber = buffer.subarray(offset, offset + length)\n    return Number(decoder.decode(strNumber))\n  } else if (type === 'object') {\n    const objEncoded = buffer.subarray(offset, offset + length)\n    try {\n      return JSON.parse(decoder.decode(objEncoded))\n    } catch (error) {\n      console.log('err. obj parse')\n    }\n  } else if (type === 'boolean') {\n    const v = buffer.readInt8(offset)\n    return v === 1\n  } else {\n    throw TypeError('invalid data')\n  }\n}\n\nfunction flatSubArray(args) {\n  let subArr = []\n  const mainArr = args.filter(item => {\n    if (Array.isArray(item[0])) subArr = subArr.concat(item)\n    else return item\n  })\n  return mainArr.concat(subArr)\n}\n\nexport function pack(...args) {\n  const bufArr = flatSubArray(args)\n  let size = 0\n  const info = []\n  let offset = 0\n\n  bufArr.forEach(bufPack => {\n    const [name, type, data] = bufPack\n    size += data.byteLength\n\n    if (typeof name === 'number' || name.length > 0) {\n    // MBA item use number type name.\n    // MB item use string type name.   null string means omit.\n    \n    // change to store more informative meta info.  \n    info.push([name, type, offset, data.byteLength]) \n    \n    }\n    offset = size\n  })\n\n\n  let infoEncoded\n  let infoSize\n\n  if (info.length > 0) {\n    let infoStr = JSON.stringify(info)\n    // console.log('pack infoStr , size:', infoStr , infoStr.length )\n    infoEncoded = encoder.encode(infoStr)\n    infoSize = infoEncoded.byteLength\n    size = size + infoSize + 2\n  }\n\n  const buffer = Buffer.alloc(size)\n  offset = 0\n  bufArr.forEach(bufPack => {\n    const buf = bufPack[2]\n    buffer.set(buf, offset)\n    offset += buf.byteLength\n  })\n\n  if (info.length > 0) {\n    buffer.set(infoEncoded, offset)\n    const infoSizeBuff = NB('16', infoSize)\n    buffer.set(infoSizeBuff, offset + infoSize)\n    return buffer\n  } else {\n    return buffer\n  }\n}\n\n\n/**\n * unpack() will use embeded meta info from the binary pack.  \n * You can specify (optional) meta obejct. \n * (It's useful to read pure buffer data.)\n * \n * You can get the meta object from:  getFrame(pack) , meta()\n * @param {Buffer|Uint8Array} binPack binaryData\n * @param {Object} meta *OPTION*  \n * @returns {Object|undefined} success: return Object (include buffer data).   fail: return undefined\n */\nexport function unpack(binPack, meta) {\n\n  const infoArr = meta || getMeta(binPack)\n  if (!infoArr) return\n\n  const buffer = Buffer.from(binPack)\n  const binObj = {}\n  let readCounter = 0\n  infoArr.forEach(bufPack => {\n    const [name, type, offset, length] = bufPack\n    binObj[name] = readTypedBuffer(type, buffer, offset, length)\n    // console.log( '###3 len',length )\n    if( length) readCounter += length\n  })\n\n  // Can not define meta for variable size buffer \n  // unpacker support automatic property to read left(did't read) buffers.\n  // console.log(\"######, unpack: buffer \" , readCounter, buffer ,buffer.byteLength)\n  if(  meta && buffer.byteLength !== readCounter ){\n    let leftSize = buffer.byteLength - readCounter\n    // console.log('total,left buffer size', buffer.byteLength, leftSize )\n    binObj[\"$OTHERS\"] = readTypedBuffer('b', buffer, readCounter, leftSize)\n  }\n\n  // set args with values if exist.\n  let mbaIndex = 0;\n  let args = [];\n  while( binObj[mbaIndex]){\n    args.push( binObj[mbaIndex++])\n  }\n  \n  if( args.length > 0 ) {\n    binObj.args = args \n    binObj.$ = binObj.args \n  }\n\n  return binObj\n\n}\n\n\n\nexport const U8 = parseUint8Array   //alias\n/**\n * \n * @param {any} data \n * @param {Boolean} shareArrayBuffer false(default):  return new( or copied) ArrayBuffer.    true: share the input data's arrayBuffer.\n * @returns {Uint8Array}\n */\nexport function parseUint8Array(data, shareArrayBuffer = false) {\n  if (data === undefined) throw TypeError('Invalid data type: Undefined')\n  if (typeof data === 'string') {\n    return encoder.encode(data)\n  } else if (typeof data === 'number') { // number -> 1 byte uint8array(number)\n    return Uint8Array.from([data])\n  } else if (data instanceof ArrayBuffer) { // arraybuffer -> wrap uint8array(ab)\n    if (shareArrayBuffer) {\n      return new Uint8Array(data)\n    } else {\n      const originData = new Uint8Array(data)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else if (ArrayBuffer.isView(data)) { // accept Buffer too.\n    if (shareArrayBuffer) {\n      return new Uint8Array(data.buffer, data.byteOffset, data.byteLength) // DataView, TypedArray >  uint8array( use offset, length )\n    } else {\n      // new memory to protect origin arraybuffer.\n      const originData = new Uint8Array(data.buffer, data.byteOffset, data.byteLength)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else { // array, object\n    return encoder.encode(JSON.stringify(data)) // object(array.. )  > JSON.str > encode > unint8array\n  }\n}\n\nexport const B8 = parseBuffer\n\nexport function parseBuffer(data, shareArrayBuffer = false) {\n\n  const u8 = parseUint8Array(data, shareArrayBuffer)\n  if( shareArrayBuffer){\n    return Buffer.from( u8.buffer, u8.byteOffset, u8.byteLength )\n  }else{\n    return Buffer.from(u8)\n  }\n}\n\nexport const B8pack = parseBufferThenConcat\nexport function parseBufferThenConcat(...dataArray) {\n  const buffers = dataArray.map(data => parseBuffer(data))\n  return Buffer.concat( buffers)\n}\n\n\nexport const U8pack = parseUint8ThenConcat // alias\n/**\n * 1. parse list of data into U8 list\n * 2. return new Uint8Array merged.\n * @param  {...any} dataArray \n * @returns \n */\nexport function parseUint8ThenConcat(...dataArray) {\n  try {\n    let bufferSize = 0\n    let offset = 0\n    const buffers = dataArray.map(data => parseUint8Array(data))\n    buffers.forEach(buf => { bufferSize += buf.byteLength })\n    const buffer = new Uint8Array(bufferSize)\n    buffers.forEach(buf => {\n      buffer.set(buf, offset)\n      offset += buf.byteLength\n    })\n    return buffer\n  } catch (error) {\n    console.log(error)\n  }\n}\n\nexport function hex(buffer) {\n  return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('')\n}\n\nexport function equal(buf1, buf2) {\n  if (buf1.byteLength !== buf2.byteLength) return false\n  for (let i = 0; i < buf1.byteLength; i++) {\n    if (buf1[i] !== buf2[i]) return false\n  }\n  return true\n}\n\n\n\n\nexport function getBufferSize(binPack) {\n  if (getMetaSize(binPack) === 0) {\n    return binPack.byteLength\n  } else {\n    return binPack.byteLength - getMetaSize(binPack) - TAIL_LEN\n  }\n\n}\n\n// MB and MBA \nexport function parseMetaInfo(binPack, infoSize) {\n  let info;\n  try {\n    const buffer = new Uint8Array(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoFrom = buffer.byteLength - infoSize - 2\n    const infoEncoded = buffer.subarray(infoFrom, buffer.byteLength - 2)\n    const decoded = decoder.decode(infoEncoded)\n    const info = JSON.parse(decoded)\n\n    if (!Array.isArray(info) || !Array.isArray(info[0])) return\n\n    let firstItem = info[0]\n    if (!firstItem) return\n\n    if (firstItem.length < 3) return\n    const [name, type, offset] = firstItem\n\n    if ( typeof type !== 'string' || typeof offset !== 'number') return\n\n    return info\n  } catch (error) {\n    // return undefined\n  }\n}\n\n\n/** \n * Meta buffer pack Tail:\n * binary Pack include TAIL(two bytes size) info at the end if it has JSON info.\n * not include TAIL if it has not JSON.\n */\nexport const TAIL_LEN = 2\n\n/**\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @returns {Number} last two byte value( read Uint16 bigendian )\n */\nexport function readTail(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n    if (binPack.byteLength <= TAIL_LEN) return 0\n\n    const dv = new DataView(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoSize = dv.getUint16(binPack.byteLength - TAIL_LEN)  // last 2 bytes for json-info-length.\n    return infoSize\n\n  } else {\n    // throw TypeError('invalid data type.')\n    return 0\n  }\n\n}\n\n\n// binay data pack is not always Buffer.  \n// It should accept Uint8Array binPack.\n// This function don't use Buffer method.\n\nexport function getMetaSize(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n\n    const size = binPack.byteLength\n    if (size <= TAIL_LEN) return 0\n\n    //1. tail size check\n    const infoSize = readTail(binPack)\n    if (infoSize === 0 || infoSize > size) return 0\n    //2. try parse JSON \n    const success = parseMetaInfo(binPack, infoSize)\n    //3. return success: jsonInfoSize,  fail: 0\n    if (success) return infoSize\n    else return 0\n  }else{\n    return 0\n  }\n}\n\n\n/**\n * \n * @param {Buffer|Uint8Array} binPack \n * @returns {Buffer} \n */\nexport function getBuffer(binPack) {\n  const rawBufferSize = getBufferSize(binPack)\n  return binPack.subarray(0, rawBufferSize)\n}\n\n\n\n/**\n * extract Meta info object if it has.\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @param {Boolean} showDetail add additional item info: full data type name and bytelength.\n * @returns {Object|undefined} success: return MetaInfo Object.   fail: return undefined.(No valid JSON included.)\n */\nexport function getMeta(binPack, showDetail = false) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  const infoSize = readTail(binPack)\n  if (infoSize === 0) return\n\n  // check valid Meta\n  let metaInfo = parseMetaInfo(binPack, infoSize)\n  if (!metaInfo) return\n\n  if (!showDetail) {\n    return metaInfo\n  } else {\n    // add additional info\n    metaInfo.forEach(bufPack => {\n      const len = bufPack[3]\n      if (len == undefined) {  // add size info.\n        if (bufPack[1].includes('8')) bufPack[3] = 1\n        else if (bufPack[1].includes('16')) bufPack[3] = 2\n        else if (bufPack[1].includes('32')) bufPack[3] = 4\n        else if (bufPack[1].includes('F')) bufPack[3] = 4\n        else if (bufPack[1].includes('!')) bufPack[3] = 1\n      }\n      bufPack[4] = parseTypeName(bufPack[1])  // add full-type-name.\n    })\n    return metaInfo\n  }\n}\n\nexport function rawPack( ...args){\n  return getBuffer( pack(...args) )\n}\n\nexport function meta( ...args){\n  return getMeta( pack(...args) )\n}\n\nexport function metaDetail( ...args){\n  return getMeta( pack(...args) , true)\n}\n\n\n\nexport function getMetaDetail(binPack) {\n  return getMeta(binPack, true)\n}\n","import { hash as sha256, hmac } from '../lib/fast-sha256.js'\nimport { MBP } from 'meta-buffer-pack'\n\nsha256.hash = function (data) {\n  return sha256(MBP.U8(data))\n}\n\nsha256.hex = function (data) {\n  return MBP.hex(sha256.hash(data))\n}\n\nsha256.hmac = function (key, data) {\n  return hmac(MBP.U8(key), MBP.U8(data))\n}\n\nexport { sha256 }\n","import{ MBP, Buffer} from \"meta-buffer-pack\"\nconst MB = MBP.MB\n\n\n// remocon message pack one byte header. \nexport let BohoMsg = {\n  AUTH_REQ : 0xB0,  \n  AUTH_NONCE: 0xB1,\n  AUTH_HMAC: 0xB2,\n  AUTH_ACK: 0xB3,\n  AUTH_FAIL: 0xB4,\n  AUTH_EXT: 0xB5,\n  ENC_PACK : 0xB6,  \n  ENC_E2E : 0xB7,  \n  ENC_488 : 0xB8\n}\n\nfor (let c in BohoMsg) { BohoMsg[BohoMsg[c]] = c }\n\nexport const Meta = {\n\n  AUTH_REQ: MBP.meta(  // 2\n    MB('header','8', 0),\n    MB('reserved','8', 0)\n  ),\n\n  AUTH_NONCE: MBP.meta(  // 13\n    MB('header','8', 0),\n    MB('unixTime','32L', 0),\n    MB('milTime','32L', 0 ),\n    MB('nonce', Buffer.alloc(4))\n  ),\n\n  AUTH_HMAC: MBP.meta( // 45\n    MB('header','8', 0),\n    MB('id8',Buffer.alloc(8)),\n    MB('nonce', Buffer.alloc(4)),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n  AUTH_ACK: MBP.meta( // 33\n    MB('header','8', 0),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n\n  ENC_PACK: MBP.meta(  //25 + payload\n    MB('type','8',0),\n    MB('len','32L',0),  // pure xdata size.  \n    MB('salt12', Buffer.alloc(12)),  // sec,mil,rand\n    MB('hmac',8,0)\n    // MB( 'xdata', encData )\n    ),\n\n\n  ENC_488: MBP.meta(   // 21 + payload\n    MB('type','8', 0 ),\n    MB('len','32L', 0 ),\n    MB('otpSrc8', Buffer.alloc(8) ),\n    MB('hmac8', Buffer.alloc(8) )\n    // MB('xdata', encData ) \n    )\n\n\n  }\n\n\n  function getMetaSize(meta){\n    let lastItem = meta[ meta.length - 1]\n    return lastItem[2] + lastItem[3]\n  }\n\n  export const MetaSize = {\n    AUTH_REQ: getMetaSize( Meta.AUTH_REQ ),\n    AUTH_NONCE: getMetaSize( Meta.AUTH_NONCE ),\n    AUTH_HMAC: getMetaSize( Meta.AUTH_HMAC ),\n    AUTH_ACK: getMetaSize( Meta.AUTH_ACK ),\n    ENC_PACK: getMetaSize( Meta.ENC_PACK ),\n    ENC_488: getMetaSize( Meta.ENC_488 )\n  }\n\n// console.log( 'boho MetaSize', MetaSize )\n// boho MetaSize {\n//   AUTH_REQ: 2,\n//   AUTH_NONCE: 13,\n//   AUTH_HMAC: 45,\n//   AUTH_ACK: 33,\n//   ENC_PACK: 25,\n//   ENC_488: 21\n// }","import { sha256 } from './sha256-mbp.js'\nimport { MBP, Buffer } from 'meta-buffer-pack'\nexport { sha256, MBP, Buffer }\n\nimport { webcrypto } from 'crypto'\nimport { BohoMsg, Meta, MetaSize } from \"./constants.js\"\nexport { BohoMsg, Meta, MetaSize }\n\nlet isNode = false\ntry {\n  isNode = Object.prototype.toString.call(global.process) === '[object process]'\n} catch (e) { }\n\n\nexport function RAND(size) {\n  if( isNode ){\n    return webcrypto.getRandomValues(Buffer.alloc(size))\n  }else{\n    return self.crypto.getRandomValues(Buffer.alloc(size))\n  }\n}\n\n\n\nexport class Boho {\n  // A. Core\n  constructor() {\n\n    this._id8 = Buffer.alloc(8)\n    this._otpSrc44 = Buffer.alloc(44)\n    this._otp36 = Buffer.alloc(36)\n    this._hmac = Buffer.alloc(32)\n\n    this.auth_salt12 = Buffer.alloc(12)\n    this.localNonce = Buffer.alloc(4)\n    this.remoteNonce = Buffer.alloc(4)\n    this.isAuthorized = false\n\n  }\n\n  clearAuth(){\n    this._id8.fill(0)\n    this._otpSrc44.fill(0)\n    this._otp36.fill(0)\n    this._hmac.fill(0)\n    this.auth_salt12.fill(0)\n    this.localNonce.fill(0)\n    this.remoteNonce.fill(0)\n    this.isAuthorized = false\n  }\n\n  // for the self\n  set_id8(data) {\n    let encStr = MBP.B8(data)\n    this._id8.fill(0)\n    encStr.copy(this._id8, 0, 0, 8)\n  }\n\n  set_hash_id8(data) {\n    let idSum = MBP.B8(sha256.hash(data))\n    idSum.copy(this._id8, 0, 0, 8)\n  }\n\n\n  set_key(data) {\n    let keySum = MBP.B8(sha256.hash(data))\n    keySum.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n  // for the remote client.\n  copy_id8(data) {\n    data.copy(this._id8, 0, 0, 8)\n  }\n\n  // for the remote client.\n  copy_key(data) {\n    data.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n\n  sha256_n(srcData, n) {\n    let hashSum = sha256.hash(srcData)\n    for (let i = 0; i < n; i++) hashSum = sha256.hash(hashSum)\n    return hashSum\n  }\n\n\n  // useful general encryption  i.e. enc_pack\n  set_clock_rand() {\n\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      RAND(4)\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  // for secure communication sender. \n  set_clock_nonce(nonce) {\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      nonce\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n\n  set_salt12(salt12) {\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  resetOTP() {\n    let otp32 = MBP.B8(sha256.hash(this._otpSrc44))\n    otp32.copy(this._otp36, 0, 0, 32)\n  }\n\n  getIndexOTP(otpIndex) {\n    this._otp36.writeUInt32LE(otpIndex, 32)\n    return sha256.hash(this._otp36)\n  }\n\n\n  generateHMAC(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n  }\n\n  // return 8 bytes of hash\n  getHMAC8(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n    return this._hmac.subarray(0, 8)\n  }\n\n  xotp(data, otpStartIndex = 0, shareDataBuffer = false) {\n\n    data = MBP.B8(data, shareDataBuffer)\n\n    let len = data.byteLength\n    let otpIndex = otpStartIndex\n    let dataOffset = 0\n    let xorCalcLen = 0\n\n    while (len > 0) {\n      xorCalcLen = len < 32 ? len : 32\n      let iotp = this.getIndexOTP(++otpIndex);\n      for (let i = 0; i < xorCalcLen; i++) {\n        data[dataOffset++] ^= iotp[i]\n      }\n      len -= 32\n    }\n    return data\n  }\n\n  // B. AUTH process\n\n  // step 1\n  // client send AUTH_REQ\n  auth_req() {\n    return MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.AUTH_REQ),\n      MBP.MB('#reserved', '8', 0)\n    )\n  }\n\n  // step 2\n  // server send AUTH_NONCE\n  auth_nonce() {\n    let now = Date.now()\n    let unixTime = Math.floor(now / 1000)\n    let milTime = now % 1000\n    this.localNonce = RAND(4)\n    this.auth_salt12 = Buffer.concat([\n     MBP.NB('32L', unixTime),\n     MBP.NB('32L', milTime),\n      this.localNonce\n    ])\n\n    let infoPack = Buffer.concat([\n     MBP.NB('8', BohoMsg.AUTH_NONCE),\n      this.auth_salt12\n    ])\n    return infoPack\n  }\n\n\n  // step 3\n  // client send AUTH_HMAC\n  // input :  auth_nonce buffer\n  auth_hmac(buffer) {\n    let auth_nonce = MBP.unpack(buffer, Meta.AUTH_NONCE)\n    if (auth_nonce) {\n      // console.log(' auth nonce', auth_nonce )\n\n      // let now = Date.now()\n      // let localUTC= Math.floor( now/ 1000 )\n      // let localMilTime = now % 1000\n\n      // console.log('time server [sec]', auth_nonce.unixTime, auth_nonce.milTime )\n      // console.log('time client [sec]', localUTC , localMilTime )\n      // console.log('time diff client and server[sec]', auth_nonce.unixTime - localUTC )\n\n      // let serverSecMil = auth_nonce.unixTime * 1000 + auth_nonce.milTime\n      // console.log('time diff msec client and server[msec]', serverSecMil - now )\n\n      let salt12 = Buffer.concat([\n       MBP.NB('32L', auth_nonce.unixTime),\n       MBP.NB('32L', auth_nonce.milTime),\n        auth_nonce.nonce\n      ])\n\n      this.set_salt12(salt12)\n\n      this.localNonce = RAND(4)\n      // hmac( key, sec,mil,serverNonce, localNonce)\n      this.generateHMAC(this.localNonce)\n\n      // let hmac8 = this._hmac.subarray(0, 8)\n\n      this.remoteNonce = auth_nonce.nonce\n\n      let auth_hmac_buffer = MBP.pack( // 21 -> 45\n       MBP.MB('#header', '8', BohoMsg.AUTH_HMAC),\n       MBP.MB('#id8', this._id8),\n       MBP.MB('#nonce', this.localNonce),\n       MBP.MB('#hmac32', this._hmac ), //full 32bytes hash\n      )\n\n      return auth_hmac_buffer\n    }\n    return false\n  }\n\n  /*  \n      step 4.  for server\n  \n      step 4-1. check client's auth_hmac\n      step 4-2. reply result\n          send AUTH_ACK  with another HMAC for client.\n          or send AUTH_FAIL when fail.\n   */\n\n  // input: unpack object or buffer of auth_hmac\n  check_auth_hmac(data) {\n    let infoPack\n    if (data instanceof Uint8Array) {\n      infoPack = MBP.unpack(data, Meta.AUTH_HMAC)\n      if (!infoPack) {\n        // console.log('auth_hamc unpack fail.')\n        return\n      }\n    } else {\n      infoPack = data;\n\n    }\n    // console.log('auth_hamc infoObj', infoPack )\n\n    this.set_salt12(this.auth_salt12)\n\n    // hmac( key, sec,mil,serverNonce, clientNonce)\n    this.generateHMAC(infoPack.nonce)\n    // let hmac8 = this._hmac.subarray(0, 8)\n    let hmac32 = this._hmac\n\n    if (MBP.equal(infoPack.hmac32, hmac32)) {\n      //Auth success then store client nonce.\n      this.remoteNonce = infoPack.nonce\n\n      let salt12 = Buffer.concat([\n        this.localNonce,\n        this.remoteNonce,\n        this.localNonce\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(infoPack.nonce)\n      let replyHMAC = this._hmac\n\n      let auth_ack = MBP.rawPack( \n       MBP.MB('header', '8', BohoMsg.AUTH_ACK),\n       MBP.MB('hmac32', replyHMAC)\n      )\n      this.isAuthorized = true\n      return auth_ack\n    }\n    return false\n  }\n\n\n\n  // step 5.  cross check\n  // client check server's hmac.  \n  check_auth_ack_hmac(buffer) {\n    // server response has hmac ( key + clientNonce)\n    let auth_ack = MBP.unpack(buffer, Meta.AUTH_ACK)\n    if (auth_ack) {\n      let salt12 = Buffer.concat([\n        this.remoteNonce,\n        this.localNonce,\n        this.remoteNonce,\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(this.localNonce)\n      // let hmac8 = this._hmac.subarray(0, 8)\n      let hmac32 = this._hmac\n      //server side hmac using client nonce.\n      if (MBP.equal(hmac32, auth_ack.hmac32)) {\n        this.isAuthorized = true\n        return true\n      }\n    }\n    // server hmac error\n    return\n  }\n\n  // C. Secure Communication\n\n  // Must AUTH first.\n  encrypt_488(data) {  // payload max about 2^32 bytes.\n    if (!this.isAuthorized) return\n\n    data = MBP.B8(data)\n\n    this.set_clock_nonce(this.remoteNonce)\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_488),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#otpSrc8', this._otpSrc44.subarray(32, 40)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    // console.log('enc pack result', pack )\n    return pack\n  }\n\n\n  decrypt_488(data) {\n    data = MBP.B8(data)\n\n    let pack = MBP.unpack(data, Meta.ENC_488)\n\n    if (pack) {\n\n      let salt12 = Buffer.concat([\n        pack.otpSrc8,\n        this.localNonce\n      ])\n\n      this.set_salt12(salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS.subarray(0, pack.len)\n      let decData = this.xotp(xdata)\n\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(hmac8, pack.hmac8)) return decData\n\n      // console.log('hmac dismatch', decData )\n    } else {\n      // console.log('unpack fail')\n    }\n  }\n\n\n  // maxium data size is 2**32 -1 bytes.\n  encryptPack(data) {\n    data = MBP.B8(data)\n\n    this.set_clock_rand()\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_PACK),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#salt12', this._otpSrc44.subarray(32)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    return pack\n  }\n\n\n  decryptPack(data) {\n\n    if (data[0] !== BohoMsg.ENC_PACK) {\n      // console.log('Boho: Invalid packType')\n      return\n    }\n\n    // packLength\n    let readPackLen = data.readUint32LE(1);\n    if (readPackLen != data.byteLength - MetaSize.ENC_PACK) {\n      // console.log('Boho: Invalid LEN data_len: data.byteLen' , readPackLen, data.byteLength)\n      return\n    }\n\n    try {\n      let pack = MBP.unpack(data, Meta.ENC_PACK)\n      //  console.log('unpack result', pack )\n      if (!pack) return\n\n      this.set_salt12(pack.salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS\n      let decData = this.xotp(xdata)\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(pack.hmac, hmac8)) {\n        pack.data = decData\n        return pack\n      }\n      // console.log('Invalid HMAC', pack.hmac, hmac8 )\n\n    } catch (error) {\n      // console.log('Boho: unpack err', error )\n\n    }\n  }\n\n  encrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let pack = this.encryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return pack;\n  }\n\n  decrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let decPack = this.decryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return decPack\n  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\ No newline at end of file
diff --git a/dist/boho.min.js b/dist/boho.min.js
index fd5ed01..3b2d036 100644
--- a/dist/boho.min.js
+++ b/dist/boho.min.js
@@ -1,3 +1,3 @@
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o(t).update(e),n=r.digest();return r.clean(),n}(H(t),H(e))};const et=T;let rt={AUTH_REQ:176,AUTH_NONCE:177,AUTH_HMAC:178,AUTH_ACK:179,AUTH_FAIL:180,AUTH_EXT:181,ENC_PACK:182,ENC_E2E:183,ENC_488:184};for(let t in rt)rt[rt[t]]=t;const nt={AUTH_REQ:Z(et("header","8",0),et("reserved","8",0)),AUTH_NONCE:Z(et("header","8",0),et("unixTime","32L",0),et("milTime","32L",0),et("nonce",E.Buffer.alloc(4))),AUTH_HMAC:Z(et("header","8",0),et("id8",E.Buffer.alloc(8)),et("nonce",E.Buffer.alloc(4)),et("hmac32",E.Buffer.alloc(32))),AUTH_ACK:Z(et("header","8",0),et("hmac32",E.Buffer.alloc(32))),ENC_PACK:Z(et("type","8",0),et("len","32L",0),et("salt12",E.Buffer.alloc(12)),et("hmac",8,0)),ENC_488:Z(et("type","8",0),et("len","32L",0),et("otpSrc8",E.Buffer.alloc(8)),et("hmac8",E.Buffer.alloc(8)))};function it(t){let e=t[t.length-1];return e[2]+e[3]}const ot={AUTH_REQ:it(nt.AUTH_REQ),AUTH_NONCE:it(nt.AUTH_NONCE),AUTH_HMAC:it(nt.AUTH_HMAC),AUTH_ACK:it(nt.AUTH_ACK),ENC_PACK:it(nt.ENC_PACK),ENC_488:it(nt.ENC_488)};let ft=!1;try{ft="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function st(t){return ft?webcrypto.getRandomValues(E.Buffer.alloc(t)):self.crypto.getRandomValues(E.Buffer.alloc(t))}class ut{constructor(){this._id8=E.Buffer.alloc(8),this._otpSrc44=E.Buffer.alloc(44),this._otp36=E.Buffer.alloc(36),this._hmac=E.Buffer.alloc(32),this.auth_salt12=E.Buffer.alloc(12),this.localNonce=E.Buffer.alloc(4),this.remoteNonce=E.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=k(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){k(f.hash(t)).copy(this._id8,0,0,8)}set_key(t){k(f.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=f.hash(t);for(let t=0;t<e;t++)r=f.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;E.Buffer.concat([L("32L",e),L("32L",t),st(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;E.Buffer.concat([L("32L",r),L("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){k(f.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),f.hash(this._otp36)}generateHMAC(t){let e=E.Buffer.concat([this._otpSrc44,t]);this._hmac=k(f.hash(e))}getHMAC8(t){let e=E.Buffer.concat([this._otpSrc44,t]);return this._hmac=k(f.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let n=(t=k(t,r)).byteLength,i=e,o=0,f=0;for(;n>0;){f=n<32?n:32;let e=this.getIndexOTP(++i);for(let r=0;r<f;r++)t[o++]^=e[r];n-=32}return t}auth_req(){return R(T("#type","8",rt.AUTH_REQ),T("#reserved","8",0))}auth_nonce(){let t=Date.now(),e=Math.floor(t/1e3),r=t%1e3;return this.localNonce=st(4),this.auth_salt12=E.Buffer.concat([L("32L",e),L("32L",r),this.localNonce]),E.Buffer.concat([L("8",rt.AUTH_NONCE),this.auth_salt12])}auth_hmac(t){let e=M(t,nt.AUTH_NONCE);if(e){let t=E.Buffer.concat([L("32L",e.unixTime),L("32L",e.milTime),e.nonce]);return this.set_salt12(t),this.localNonce=st(4),this.generateHMAC(this.localNonce),this.remoteNonce=e.nonce,R(T("#header","8",rt.AUTH_HMAC),T("#id8",this._id8),T("#nonce",this.localNonce),T("#hmac32",this._hmac))}return!1}check_auth_hmac(t){let e;if(t instanceof Uint8Array){if(e=M(t,nt.AUTH_HMAC),!e)return}else e=t;this.set_salt12(this.auth_salt12),this.generateHMAC(e.nonce);let r=this._hmac;if(K(e.hmac32,r)){this.remoteNonce=e.nonce;let t=E.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=W(T("header","8",rt.AUTH_ACK),T("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=M(t,nt.AUTH_ACK);if(e){let t=E.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),K(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=k(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_488),T("#len","32L",t.byteLength),T("#otpSrc8",this._otpSrc44.subarray(32,40)),T("#hmac8",e),T("#xdata",r))}decrypt_488(t){let e=M(t=k(t),nt.ENC_488);if(e){let t=E.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(K(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=k(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_PACK),T("#len","32L",t.byteLength),T("#salt12",this._otpSrc44.subarray(32)),T("#hmac8",e),T("#xdata",r))}decryptPack(t){if(t[0]!==rt.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-ot.ENC_PACK)try{let e=M(t,nt.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(K(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=E.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=E.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}}return ut.RAND=st,ut.BohoMsg=rt,ut.Meta=nt,ut.MetaSize=ot,ut.sha256=f,ut.MBP=tt,ut.Buffer=E.Buffer,ut}();
 //# sourceMappingURL=boho.min.js.map
diff --git a/dist/boho.min.js.map b/dist/boho.min.js.map
index fc2ae92..f766c69 100644
--- a/dist/boho.min.js.map
+++ b/dist/boho.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"boho.min.js","sources":["../lib/fast-sha256.js","../node_modules/base64-js/index.js","../node_modules/ieee754/index.js","../node_modules/buffer/index.js","../node_modules/meta-buffer-pack/src/meta-buffer-pack.js","../src/sha256-mbp.js","../src/constants.js","../src/boho.js","../src/browserDefault.js"],"sourcesContent":["// SHA-256 (+ HMAC and PBKDF2) for JavaScript.\n//\n// Written in 2014-2016 by Dmitry Chestnykh.\n// Public domain, no warranty.\n//\n// Functions (accept and return Uint8Arrays):\n//\n//   sha256(message) -> hash\n//   sha256.hmac(key, message) -> mac\n//   sha256.pbkdf2(password, salt, rounds, dkLen) -> dk\n//\n//  Classes:\n//\n//   new sha256.Hash()\n//   new sha256.HMAC(key)\n//\nexport var digestLength = 32\nexport var blockSize = 64\n// SHA-256 constants\nconst K = new Uint32Array([\n  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,\n  0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,\n  0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,\n  0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,\n  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,\n  0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,\n  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,\n  0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\n  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,\n  0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,\n  0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,\n  0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,\n  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\n])\nfunction hashBlocks (w, v, p, pos, len) {\n  let a, b, c, d, e, f, g, h, u, i, j, t1, t2\n  while (len >= 64) {\n    a = v[0]\n    b = v[1]\n    c = v[2]\n    d = v[3]\n    e = v[4]\n    f = v[5]\n    g = v[6]\n    h = v[7]\n    for (i = 0; i < 16; i++) {\n      j = pos + i * 4\n      w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |\n                ((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff))\n    }\n    for (i = 16; i < 64; i++) {\n      u = w[i - 2]\n      t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10)\n      u = w[i - 15]\n      t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3)\n      w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0)\n    }\n    for (i = 0; i < 64; i++) {\n      t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^\n                (e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +\n                ((h + ((K[i] + w[i]) | 0)) | 0)) | 0\n      t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^\n                (a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 0\n      h = g\n      g = f\n      f = e\n      e = (d + t1) | 0\n      d = c\n      c = b\n      b = a\n      a = (t1 + t2) | 0\n    }\n    v[0] += a\n    v[1] += b\n    v[2] += c\n    v[3] += d\n    v[4] += e\n    v[5] += f\n    v[6] += g\n    v[7] += h\n    pos += 64\n    len -= 64\n  }\n  return pos\n}\n// Hash implements SHA256 hash algorithm.\nconst Hash = /** @class */ (function () {\n  function Hash () {\n    this.digestLength = digestLength\n    this.blockSize = blockSize\n    // Note: Int32Array is used instead of Uint32Array for performance reasons.\n    this.state = new Int32Array(8) // hash state\n    this.temp = new Int32Array(64) // temporary state\n    this.buffer = new Uint8Array(128) // buffer for data to hash\n    this.bufferLength = 0 // number of bytes in buffer\n    this.bytesHashed = 0 // number of total bytes hashed\n    this.finished = false // indicates whether the hash was finalized\n    this.reset()\n  }\n  // Resets hash state making it possible\n  // to re-use this instance to hash other data.\n  Hash.prototype.reset = function () {\n    this.state[0] = 0x6a09e667\n    this.state[1] = 0xbb67ae85\n    this.state[2] = 0x3c6ef372\n    this.state[3] = 0xa54ff53a\n    this.state[4] = 0x510e527f\n    this.state[5] = 0x9b05688c\n    this.state[6] = 0x1f83d9ab\n    this.state[7] = 0x5be0cd19\n    this.bufferLength = 0\n    this.bytesHashed = 0\n    this.finished = false\n    return this\n  }\n  // Cleans internal buffers and re-initializes hash state.\n  Hash.prototype.clean = function () {\n    for (var i = 0; i < this.buffer.length; i++) {\n      this.buffer[i] = 0\n    }\n    for (var i = 0; i < this.temp.length; i++) {\n      this.temp[i] = 0\n    }\n    this.reset()\n  }\n  // Updates hash state with the given data.\n  //\n  // Optionally, length of the data can be specified to hash\n  // fewer bytes than data.length.\n  //\n  // Throws error when trying to update already finalized hash:\n  // instance must be reset to use it again.\n  Hash.prototype.update = function (data, dataLength) {\n    if (dataLength === void 0) { dataLength = data.length }\n    if (this.finished) {\n      throw new Error(\"SHA256: can't update because hash was finished.\")\n    }\n    let dataPos = 0\n    this.bytesHashed += dataLength\n    if (this.bufferLength > 0) {\n      while (this.bufferLength < 64 && dataLength > 0) {\n        this.buffer[this.bufferLength++] = data[dataPos++]\n        dataLength--\n      }\n      if (this.bufferLength === 64) {\n        hashBlocks(this.temp, this.state, this.buffer, 0, 64)\n        this.bufferLength = 0\n      }\n    }\n    if (dataLength >= 64) {\n      dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength)\n      dataLength %= 64\n    }\n    while (dataLength > 0) {\n      this.buffer[this.bufferLength++] = data[dataPos++]\n      dataLength--\n    }\n    return this\n  }\n  // Finalizes hash state and puts hash into out.\n  //\n  // If hash was already finalized, puts the same value.\n  Hash.prototype.finish = function (out) {\n    if (!this.finished) {\n      const bytesHashed = this.bytesHashed\n      const left = this.bufferLength\n      const bitLenHi = (bytesHashed / 0x20000000) | 0\n      const bitLenLo = bytesHashed << 3\n      const padLength = (bytesHashed % 64 < 56) ? 64 : 128\n      this.buffer[left] = 0x80\n      for (var i = left + 1; i < padLength - 8; i++) {\n        this.buffer[i] = 0\n      }\n      this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff\n      this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff\n      this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff\n      this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff\n      this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff\n      this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff\n      this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff\n      this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff\n      hashBlocks(this.temp, this.state, this.buffer, 0, padLength)\n      this.finished = true\n    }\n    for (var i = 0; i < 8; i++) {\n      out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff\n      out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff\n      out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff\n      out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff\n    }\n    return this\n  }\n  // Returns the final hash digest.\n  Hash.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._saveState = function (out) {\n    for (let i = 0; i < this.state.length; i++) {\n      out[i] = this.state[i]\n    }\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._restoreState = function (from, bytesHashed) {\n    for (let i = 0; i < this.state.length; i++) {\n      this.state[i] = from[i]\n    }\n    this.bytesHashed = bytesHashed\n    this.finished = false\n    this.bufferLength = 0\n  }\n  return Hash\n}())\nexport { Hash }\n// HMAC implements HMAC-SHA256 message authentication algorithm.\nconst HMAC = /** @class */ (function () {\n  function HMAC (key) {\n    this.inner = new Hash()\n    this.outer = new Hash()\n    this.blockSize = this.inner.blockSize\n    this.digestLength = this.inner.digestLength\n    const pad = new Uint8Array(this.blockSize)\n    if (key.length > this.blockSize) {\n      (new Hash()).update(key).finish(pad).clean()\n    } else {\n      for (var i = 0; i < key.length; i++) {\n        pad[i] = key[i]\n      }\n    }\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36\n    }\n    this.inner.update(pad)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36 ^ 0x5c\n    }\n    this.outer.update(pad)\n    this.istate = new Uint32Array(8)\n    this.ostate = new Uint32Array(8)\n    this.inner._saveState(this.istate)\n    this.outer._saveState(this.ostate)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] = 0\n    }\n  }\n  // Returns HMAC state to the state initialized with key\n  // to make it possible to run HMAC over the other data with the same\n  // key without creating a new instance.\n  HMAC.prototype.reset = function () {\n    this.inner._restoreState(this.istate, this.inner.blockSize)\n    this.outer._restoreState(this.ostate, this.outer.blockSize)\n    return this\n  }\n  // Cleans HMAC state.\n  HMAC.prototype.clean = function () {\n    for (let i = 0; i < this.istate.length; i++) {\n      this.ostate[i] = this.istate[i] = 0\n    }\n    this.inner.clean()\n    this.outer.clean()\n  }\n  // Updates state with provided data.\n  HMAC.prototype.update = function (data) {\n    this.inner.update(data)\n    return this\n  }\n  // Finalizes HMAC and puts the result in out.\n  HMAC.prototype.finish = function (out) {\n    if (this.outer.finished) {\n      this.outer.finish(out)\n    } else {\n      this.inner.finish(out)\n      this.outer.update(out, this.digestLength).finish(out)\n    }\n    return this\n  }\n  // Returns message authentication code.\n  HMAC.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  return HMAC\n}())\nexport { HMAC }\n// Returns SHA256 hash of data.\nexport function hash (data) {\n  const h = (new Hash()).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Function hash is both available as module.hash and as default export.\nexport default hash\n// Returns HMAC-SHA256 of data under the key.\nexport function hmac (key, data) {\n  const h = (new HMAC(key)).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Fills hkdf buffer like this:\n// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)\nfunction fillBuffer (buffer, hmac, info, counter) {\n  // Counter is a byte value: check if it overflowed.\n  const num = counter[0]\n  if (num === 0) {\n    throw new Error('hkdf: cannot expand more')\n  }\n  // Prepare HMAC instance for new data with old key.\n  hmac.reset()\n  // Hash in previous output if it was generated\n  // (i.e. counter is greater than 1).\n  if (num > 1) {\n    hmac.update(buffer)\n  }\n  // Hash in info if it exists.\n  if (info) {\n    hmac.update(info)\n  }\n  // Hash in the counter.\n  hmac.update(counter)\n  // Output result to buffer and clean HMAC instance.\n  hmac.finish(buffer)\n  // Increment counter inside typed array, this works properly.\n  counter[0]++\n}\nconst hkdfSalt = new Uint8Array(digestLength) // Filled with zeroes.\nexport function hkdf (key, salt, info, length) {\n  if (salt === void 0) { salt = hkdfSalt }\n  if (length === void 0) { length = 32 }\n  const counter = new Uint8Array([1])\n  // HKDF-Extract uses salt as HMAC key, and key as data.\n  const okm = hmac(salt, key)\n  // Initialize HMAC for expanding with extracted key.\n  // Ensure no collisions with `hmac` function.\n  const hmac_ = new HMAC(okm)\n  // Allocate buffer.\n  const buffer = new Uint8Array(hmac_.digestLength)\n  let bufpos = buffer.length\n  const out = new Uint8Array(length)\n  for (let i = 0; i < length; i++) {\n    if (bufpos === buffer.length) {\n      fillBuffer(buffer, hmac_, info, counter)\n      bufpos = 0\n    }\n    out[i] = buffer[bufpos++]\n  }\n  hmac_.clean()\n  buffer.fill(0)\n  counter.fill(0)\n  return out\n}\n// Derives a key from password and salt using PBKDF2-HMAC-SHA256\n// with the given number of iterations.\n//\n// The number of bytes returned is equal to dkLen.\n//\n// (For better security, avoid dkLen greater than hash length - 32 bytes).\nexport function pbkdf2 (password, salt, iterations, dkLen) {\n  const prf = new HMAC(password)\n  const len = prf.digestLength\n  const ctr = new Uint8Array(4)\n  const t = new Uint8Array(len)\n  const u = new Uint8Array(len)\n  const dk = new Uint8Array(dkLen)\n  for (var i = 0; i * len < dkLen; i++) {\n    const c = i + 1\n    ctr[0] = (c >>> 24) & 0xff\n    ctr[1] = (c >>> 16) & 0xff\n    ctr[2] = (c >>> 8) & 0xff\n    ctr[3] = (c >>> 0) & 0xff\n    prf.reset()\n    prf.update(salt)\n    prf.update(ctr)\n    prf.finish(u)\n    for (var j = 0; j < len; j++) {\n      t[j] = u[j]\n    }\n    for (var j = 2; j <= iterations; j++) {\n      prf.reset()\n      prf.update(u).finish(u)\n      for (let k = 0; k < len; k++) {\n        t[k] ^= u[k]\n      }\n    }\n    for (var j = 0; j < len && i * len + j < dkLen; j++) {\n      dk[i * len + j] = t[j]\n    }\n  }\n  for (var i = 0; i < len; i++) {\n    t[i] = u[i] = 0\n  }\n  for (var i = 0; i < 4; i++) {\n    ctr[i] = 0\n  }\n  prf.clean()\n  return dk\n}\n","'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\n// Support decoding URL-safe base64 strings, as Node.js does.\n// See: https://en.wikipedia.org/wiki/Base64#URL_applications\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction getLens (b64) {\n  var len = b64.length\n\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // Trim off extra bytes after placeholder bytes are found\n  // See: https://github.com/beatgammit/base64-js/issues/42\n  var validLen = b64.indexOf('=')\n  if (validLen === -1) validLen = len\n\n  var placeHoldersLen = validLen === len\n    ? 0\n    : 4 - (validLen % 4)\n\n  return [validLen, placeHoldersLen]\n}\n\n// base64 is 4/3 + up to two characters of the original data\nfunction byteLength (b64) {\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction _byteLength (b64, validLen, placeHoldersLen) {\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction toByteArray (b64) {\n  var tmp\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n\n  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))\n\n  var curByte = 0\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  var len = placeHoldersLen > 0\n    ? validLen - 4\n    : validLen\n\n  var i\n  for (i = 0; i < len; i += 4) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 18) |\n      (revLookup[b64.charCodeAt(i + 1)] << 12) |\n      (revLookup[b64.charCodeAt(i + 2)] << 6) |\n      revLookup[b64.charCodeAt(i + 3)]\n    arr[curByte++] = (tmp >> 16) & 0xFF\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 2) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 2) |\n      (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 1) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 10) |\n      (revLookup[b64.charCodeAt(i + 1)] << 4) |\n      (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] +\n    lookup[num >> 12 & 0x3F] +\n    lookup[num >> 6 & 0x3F] +\n    lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp =\n      ((uint8[i] << 16) & 0xFF0000) +\n      ((uint8[i + 1] << 8) & 0xFF00) +\n      (uint8[i + 2] & 0xFF)\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 2] +\n      lookup[(tmp << 4) & 0x3F] +\n      '=='\n    )\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 10] +\n      lookup[(tmp >> 4) & 0x3F] +\n      lookup[(tmp << 2) & 0x3F] +\n      '='\n    )\n  }\n\n  return parts.join('')\n}\n","/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */\nexports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n","/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <https://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nconst base64 = require('base64-js')\nconst ieee754 = require('ieee754')\nconst customInspectSymbol =\n  (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation\n    ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation\n    : null\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\nconst K_MAX_LENGTH = 0x7fffffff\nexports.kMaxLength = K_MAX_LENGTH\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Print warning and recommend using `buffer` v4.x which has an Object\n *               implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * We report that the browser does not support typed arrays if the are not subclassable\n * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`\n * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support\n * for __proto__ and has a buggy typed array implementation.\n */\nBuffer.TYPED_ARRAY_SUPPORT = typedArraySupport()\n\nif (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&\n    typeof console.error === 'function') {\n  console.error(\n    'This browser lacks typed array (Uint8Array) support which is required by ' +\n    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'\n  )\n}\n\nfunction typedArraySupport () {\n  // Can typed array instances can be augmented?\n  try {\n    const arr = new Uint8Array(1)\n    const proto = { foo: function () { return 42 } }\n    Object.setPrototypeOf(proto, Uint8Array.prototype)\n    Object.setPrototypeOf(arr, proto)\n    return arr.foo() === 42\n  } catch (e) {\n    return false\n  }\n}\n\nObject.defineProperty(Buffer.prototype, 'parent', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.buffer\n  }\n})\n\nObject.defineProperty(Buffer.prototype, 'offset', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.byteOffset\n  }\n})\n\nfunction createBuffer (length) {\n  if (length > K_MAX_LENGTH) {\n    throw new RangeError('The value \"' + length + '\" is invalid for option \"size\"')\n  }\n  // Return an augmented `Uint8Array` instance\n  const buf = new Uint8Array(length)\n  Object.setPrototypeOf(buf, Buffer.prototype)\n  return buf\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new TypeError(\n        'The \"string\" argument must be of type string. Received type number'\n      )\n    }\n    return allocUnsafe(arg)\n  }\n  return from(arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\nfunction from (value, encodingOrOffset, length) {\n  if (typeof value === 'string') {\n    return fromString(value, encodingOrOffset)\n  }\n\n  if (ArrayBuffer.isView(value)) {\n    return fromArrayView(value)\n  }\n\n  if (value == null) {\n    throw new TypeError(\n      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n      'or Array-like Object. Received type ' + (typeof value)\n    )\n  }\n\n  if (isInstance(value, ArrayBuffer) ||\n      (value && isInstance(value.buffer, ArrayBuffer))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof SharedArrayBuffer !== 'undefined' &&\n      (isInstance(value, SharedArrayBuffer) ||\n      (value && isInstance(value.buffer, SharedArrayBuffer)))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'number') {\n    throw new TypeError(\n      'The \"value\" argument must not be of type number. Received type number'\n    )\n  }\n\n  const valueOf = value.valueOf && value.valueOf()\n  if (valueOf != null && valueOf !== value) {\n    return Buffer.from(valueOf, encodingOrOffset, length)\n  }\n\n  const b = fromObject(value)\n  if (b) return b\n\n  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&\n      typeof value[Symbol.toPrimitive] === 'function') {\n    return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)\n  }\n\n  throw new TypeError(\n    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n    'or Array-like Object. Received type ' + (typeof value)\n  )\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(value, encodingOrOffset, length)\n}\n\n// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:\n// https://github.com/feross/buffer/pull/148\nObject.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)\nObject.setPrototypeOf(Buffer, Uint8Array)\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be of type number')\n  } else if (size < 0) {\n    throw new RangeError('The value \"' + size + '\" is invalid for option \"size\"')\n  }\n}\n\nfunction alloc (size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpreted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(size).fill(fill, encoding)\n      : createBuffer(size).fill(fill)\n  }\n  return createBuffer(size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(size, fill, encoding)\n}\n\nfunction allocUnsafe (size) {\n  assertSize(size)\n  return createBuffer(size < 0 ? 0 : checked(size) | 0)\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(size)\n}\n\nfunction fromString (string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('Unknown encoding: ' + encoding)\n  }\n\n  const length = byteLength(string, encoding) | 0\n  let buf = createBuffer(length)\n\n  const actual = buf.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    buf = buf.slice(0, actual)\n  }\n\n  return buf\n}\n\nfunction fromArrayLike (array) {\n  const length = array.length < 0 ? 0 : checked(array.length) | 0\n  const buf = createBuffer(length)\n  for (let i = 0; i < length; i += 1) {\n    buf[i] = array[i] & 255\n  }\n  return buf\n}\n\nfunction fromArrayView (arrayView) {\n  if (isInstance(arrayView, Uint8Array)) {\n    const copy = new Uint8Array(arrayView)\n    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)\n  }\n  return fromArrayLike(arrayView)\n}\n\nfunction fromArrayBuffer (array, byteOffset, length) {\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\"offset\" is outside of buffer bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\"length\" is outside of buffer bounds')\n  }\n\n  let buf\n  if (byteOffset === undefined && length === undefined) {\n    buf = new Uint8Array(array)\n  } else if (length === undefined) {\n    buf = new Uint8Array(array, byteOffset)\n  } else {\n    buf = new Uint8Array(array, byteOffset, length)\n  }\n\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(buf, Buffer.prototype)\n\n  return buf\n}\n\nfunction fromObject (obj) {\n  if (Buffer.isBuffer(obj)) {\n    const len = checked(obj.length) | 0\n    const buf = createBuffer(len)\n\n    if (buf.length === 0) {\n      return buf\n    }\n\n    obj.copy(buf, 0, 0, len)\n    return buf\n  }\n\n  if (obj.length !== undefined) {\n    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {\n      return createBuffer(0)\n    }\n    return fromArrayLike(obj)\n  }\n\n  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {\n    return fromArrayLike(obj.data)\n  }\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= K_MAX_LENGTH) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return b != null && b._isBuffer === true &&\n    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false\n}\n\nBuffer.compare = function compare (a, b) {\n  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)\n  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError(\n      'The \"buf1\", \"buf2\" arguments must be one of type Buffer or Uint8Array'\n    )\n  }\n\n  if (a === b) return 0\n\n  let x = a.length\n  let y = b.length\n\n  for (let i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!Array.isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  let i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  const buffer = Buffer.allocUnsafe(length)\n  let pos = 0\n  for (i = 0; i < list.length; ++i) {\n    let buf = list[i]\n    if (isInstance(buf, Uint8Array)) {\n      if (pos + buf.length > buffer.length) {\n        if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)\n        buf.copy(buffer, pos)\n      } else {\n        Uint8Array.prototype.set.call(\n          buffer,\n          buf,\n          pos\n        )\n      }\n    } else if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    } else {\n      buf.copy(buffer, pos)\n    }\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    throw new TypeError(\n      'The \"string\" argument must be one of type string, Buffer, or ArrayBuffer. ' +\n      'Received type ' + typeof string\n    )\n  }\n\n  const len = string.length\n  const mustMatch = (arguments.length > 2 && arguments[2] === true)\n  if (!mustMatch && len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) {\n          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8\n        }\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  let loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)\n// to detect a Buffer instance. It's not possible to use `instanceof Buffer`\n// reliably in a browserify context because there could be multiple different\n// copies of the 'buffer' package in use. This method works even for Buffer\n// instances that were created from another copy of the `buffer` package.\n// See: https://github.com/feross/buffer/issues/154\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  const i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  const len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (let i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  const len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (let i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  const len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (let i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  const length = this.length\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.toLocaleString = Buffer.prototype.toString\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  let str = ''\n  const max = exports.INSPECT_MAX_BYTES\n  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()\n  if (this.length > max) str += ' ... '\n  return '<Buffer ' + str + '>'\n}\nif (customInspectSymbol) {\n  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (isInstance(target, Uint8Array)) {\n    target = Buffer.from(target, target.offset, target.byteLength)\n  }\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError(\n      'The \"target\" argument must be one of type Buffer or Uint8Array. ' +\n      'Received type ' + (typeof target)\n    )\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  let x = thisEnd - thisStart\n  let y = end - start\n  const len = Math.min(x, y)\n\n  const thisCopy = this.slice(thisStart, thisEnd)\n  const targetCopy = target.slice(start, end)\n\n  for (let i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset // Coerce to Number.\n  if (numberIsNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  let indexSize = 1\n  let arrLength = arr.length\n  let valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  let i\n  if (dir) {\n    let foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      let found = true\n      for (let j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  const remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  const strLen = string.length\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  let i\n  for (i = 0; i < length; ++i) {\n    const parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (numberIsNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset >>> 0\n    if (isFinite(length)) {\n      length = length >>> 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  const remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return asciiWrite(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  const res = []\n\n  let i = start\n  while (i < end) {\n    const firstByte = buf[i]\n    let codePoint = null\n    let bytesPerSequence = (firstByte > 0xEF)\n      ? 4\n      : (firstByte > 0xDF)\n          ? 3\n          : (firstByte > 0xBF)\n              ? 2\n              : 1\n\n    if (i + bytesPerSequence <= end) {\n      let secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nconst MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  const len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  let res = ''\n  let i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  const len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  let out = ''\n  for (let i = start; i < end; ++i) {\n    out += hexSliceLookupTable[buf[i]]\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  const bytes = buf.slice(start, end)\n  let res = ''\n  // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)\n  for (let i = 0; i < bytes.length - 1; i += 2) {\n    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  const len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  const newBuf = this.subarray(start, end)\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(newBuf, Buffer.prototype)\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUintLE =\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUintBE =\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  let val = this[offset + --byteLength]\n  let mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUint8 =\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUint16LE =\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUint16BE =\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUint32LE =\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUint32BE =\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const lo = first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24\n\n  const hi = this[++offset] +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    last * 2 ** 24\n\n  return BigInt(lo) + (BigInt(hi) << BigInt(32))\n})\n\nBuffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const hi = first * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  const lo = this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last\n\n  return (BigInt(hi) << BigInt(32)) + BigInt(lo)\n})\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let i = byteLength\n  let mul = 1\n  let val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = this[offset + 4] +\n    this[offset + 5] * 2 ** 8 +\n    this[offset + 6] * 2 ** 16 +\n    (last << 24) // Overflow\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24)\n})\n\nBuffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = (first << 24) + // Overflow\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last)\n})\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUintLE =\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let mul = 1\n  let i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUintBE =\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUint8 =\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeUint16LE =\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint16BE =\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint32LE =\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset + 3] = (value >>> 24)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 1] = (value >>> 8)\n  this[offset] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeUint32BE =\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nfunction wrtBigUInt64LE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  return offset\n}\n\nfunction wrtBigUInt64BE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset + 7] = lo\n  lo = lo >> 8\n  buf[offset + 6] = lo\n  lo = lo >> 8\n  buf[offset + 5] = lo\n  lo = lo >> 8\n  buf[offset + 4] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset + 3] = hi\n  hi = hi >> 8\n  buf[offset + 2] = hi\n  hi = hi >> 8\n  buf[offset + 1] = hi\n  hi = hi >> 8\n  buf[offset] = hi\n  return offset + 8\n}\n\nBuffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = 0\n  let mul = 1\n  let sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  let sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 3] = (value >>> 24)\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nBuffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  const len = end - start\n\n  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {\n    // Use built-in when available, missing from IE11\n    this.copyWithin(targetStart, start, end)\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, end),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n    if (val.length === 1) {\n      const code = val.charCodeAt(0)\n      if ((encoding === 'utf8' && code < 128) ||\n          encoding === 'latin1') {\n        // Fast path: If `val` fits into a single byte, use that numeric value.\n        val = code\n      }\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  } else if (typeof val === 'boolean') {\n    val = Number(val)\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  let i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    const bytes = Buffer.isBuffer(val)\n      ? val\n      : Buffer.from(val, encoding)\n    const len = bytes.length\n    if (len === 0) {\n      throw new TypeError('The value \"' + val +\n        '\" is invalid for argument \"value\"')\n    }\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// CUSTOM ERRORS\n// =============\n\n// Simplified versions from Node, changed for Buffer-only usage\nconst errors = {}\nfunction E (sym, getMessage, Base) {\n  errors[sym] = class NodeError extends Base {\n    constructor () {\n      super()\n\n      Object.defineProperty(this, 'message', {\n        value: getMessage.apply(this, arguments),\n        writable: true,\n        configurable: true\n      })\n\n      // Add the error code to the name to include it in the stack trace.\n      this.name = `${this.name} [${sym}]`\n      // Access the stack to generate the error message including the error code\n      // from the name.\n      this.stack // eslint-disable-line no-unused-expressions\n      // Reset the name to the actual name.\n      delete this.name\n    }\n\n    get code () {\n      return sym\n    }\n\n    set code (value) {\n      Object.defineProperty(this, 'code', {\n        configurable: true,\n        enumerable: true,\n        value,\n        writable: true\n      })\n    }\n\n    toString () {\n      return `${this.name} [${sym}]: ${this.message}`\n    }\n  }\n}\n\nE('ERR_BUFFER_OUT_OF_BOUNDS',\n  function (name) {\n    if (name) {\n      return `${name} is outside of buffer bounds`\n    }\n\n    return 'Attempt to access memory outside buffer bounds'\n  }, RangeError)\nE('ERR_INVALID_ARG_TYPE',\n  function (name, actual) {\n    return `The \"${name}\" argument must be of type number. Received type ${typeof actual}`\n  }, TypeError)\nE('ERR_OUT_OF_RANGE',\n  function (str, range, input) {\n    let msg = `The value of \"${str}\" is out of range.`\n    let received = input\n    if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {\n      received = addNumericalSeparator(String(input))\n    } else if (typeof input === 'bigint') {\n      received = String(input)\n      if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {\n        received = addNumericalSeparator(received)\n      }\n      received += 'n'\n    }\n    msg += ` It must be ${range}. Received ${received}`\n    return msg\n  }, RangeError)\n\nfunction addNumericalSeparator (val) {\n  let res = ''\n  let i = val.length\n  const start = val[0] === '-' ? 1 : 0\n  for (; i >= start + 4; i -= 3) {\n    res = `_${val.slice(i - 3, i)}${res}`\n  }\n  return `${val.slice(0, i)}${res}`\n}\n\n// CHECK FUNCTIONS\n// ===============\n\nfunction checkBounds (buf, offset, byteLength) {\n  validateNumber(offset, 'offset')\n  if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {\n    boundsError(offset, buf.length - (byteLength + 1))\n  }\n}\n\nfunction checkIntBI (value, min, max, buf, offset, byteLength) {\n  if (value > max || value < min) {\n    const n = typeof min === 'bigint' ? 'n' : ''\n    let range\n    if (byteLength > 3) {\n      if (min === 0 || min === BigInt(0)) {\n        range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`\n      } else {\n        range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +\n                `${(byteLength + 1) * 8 - 1}${n}`\n      }\n    } else {\n      range = `>= ${min}${n} and <= ${max}${n}`\n    }\n    throw new errors.ERR_OUT_OF_RANGE('value', range, value)\n  }\n  checkBounds(buf, offset, byteLength)\n}\n\nfunction validateNumber (value, name) {\n  if (typeof value !== 'number') {\n    throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)\n  }\n}\n\nfunction boundsError (value, length, type) {\n  if (Math.floor(value) !== value) {\n    validateNumber(value, type)\n    throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)\n  }\n\n  if (length < 0) {\n    throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()\n  }\n\n  throw new errors.ERR_OUT_OF_RANGE(type || 'offset',\n                                    `>= ${type ? 1 : 0} and <= ${length}`,\n                                    value)\n}\n\n// HELPER FUNCTIONS\n// ================\n\nconst INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node takes equal signs as end of the Base64 encoding\n  str = str.split('=')[0]\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = str.trim().replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  let codePoint\n  const length = string.length\n  let leadSurrogate = null\n  const bytes = []\n\n  for (let i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  let c, hi, lo\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  let i\n  for (i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\n// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass\n// the `instanceof` check but they should be treated as of that type.\n// See: https://github.com/feross/buffer/issues/166\nfunction isInstance (obj, type) {\n  return obj instanceof type ||\n    (obj != null && obj.constructor != null && obj.constructor.name != null &&\n      obj.constructor.name === type.name)\n}\nfunction numberIsNaN (obj) {\n  // For IE11 support\n  return obj !== obj // eslint-disable-line no-self-compare\n}\n\n// Create lookup table for `toString('hex')`\n// See: https://github.com/feross/buffer/issues/219\nconst hexSliceLookupTable = (function () {\n  const alphabet = '0123456789abcdef'\n  const table = new Array(256)\n  for (let i = 0; i < 16; ++i) {\n    const i16 = i * 16\n    for (let j = 0; j < 16; ++j) {\n      table[i16 + j] = alphabet[i] + alphabet[j]\n    }\n  }\n  return table\n})()\n\n// Return not function with Error if BigInt not supported\nfunction defineBigIntMethod (fn) {\n  return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn\n}\n\nfunction BufferBigIntNotDefined () {\n  throw new Error('BigInt not supported')\n}\n","import { Buffer } from 'buffer/index.js'\nexport { Buffer } // for iife reference MBP.Buffer\nconst encoder = new TextEncoder()\nconst decoder = new TextDecoder()\n\n\nexport const NB = numberBuffer\nexport function numberBuffer(type, initValue = 0) {\n  let buffer\n  if (type === undefined || typeof type !== 'string' || typeof initValue !== 'number') {\n    throw TypeError('invlaid init variablie type name. ')\n  }\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    buffer = Buffer.alloc(1)\n    if (type.includes('I')) buffer.writeInt8(initValue)\n    else buffer.writeUint8(initValue)\n  } else if (type.includes('16')) {\n    buffer = Buffer.alloc(2)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt16LE(initValue)\n      else buffer.writeInt16BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint16LE(initValue)\n      else buffer.writeUint16BE(initValue)\n    }\n  } else if (type.includes('32')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt32LE(initValue)\n      else buffer.writeInt32BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint32LE(initValue)\n      else buffer.writeUint32BE(initValue)\n    }\n  } else if (type.includes('F')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('L')) {\n      buffer.writeFloatLE(initValue)\n    } else {\n      buffer.writeFloatBE(initValue)\n    }\n  } else if (type.includes('N')) { // number as string\n    buffer = Buffer.from(String(initValue))\n  } else {\n    console.log(`invalid type: ${type} or initvalue: ${initValue}`)\n  }\n  return buffer\n}\n\n\nexport const MB = metaBuffer\nexport function metaBuffer(name, typeOrData, initValue) {\n  let buffer\n  let bufferType = 'B'\n  if (typeof typeOrData === 'number') {\n    if (typeof initValue === 'number') {  // initValue 0 should be passed.\n      buffer = Buffer.alloc(typeOrData)\n      if( initValue !== 0) buffer.fill(initValue)\n      bufferType = 'B'\n    } else {\n      buffer = Buffer.from(String(typeOrData))\n      bufferType = 'N'\n    }\n  } else if (typeof typeOrData === 'string' && typeof initValue === 'number') { // number with type.\n    bufferType = typeOrData.toUpperCase() // use explicit type name\n    buffer = numberBuffer(typeOrData, initValue) // notice.  two categories.  n: number string.  8, 16, 32: typed number.\n  } else if (typeof typeOrData === 'string' && initValue === undefined) { //  string buffer\n    buffer = Buffer.from(typeOrData)\n    bufferType = 'S'\n  } else if (typeOrData instanceof Uint8Array && initValue === undefined) { // buffer | Uint8Array\n    // Buffer.from:  Copies the passed buffer data onto a new Buffer instance.\n    // typecasting Uint8Array to Buffer.\n    buffer = (typeOrData instanceof Buffer) ? typeOrData : Buffer.from(typeOrData)\n  } else if (typeOrData instanceof ArrayBuffer && initValue === undefined) { // arrayBuffer\n    // Notice. typedArray is recommended instead of arrayBuffer\n    buffer = Buffer.from(typeOrData)\n  } else if (ArrayBuffer.isView(typeOrData)) { // typedarray buffer\n    buffer = Buffer.from(typeOrData.buffer, typeOrData.byteOffset, typeOrData.byteLength)\n  } else if (typeof typeOrData === 'object' && initValue === undefined) { //   object. like array. stringify\n    buffer = Buffer.from(JSON.stringify(typeOrData))\n    bufferType = 'O'\n  } else if (typeof typeOrData === 'boolean' && initValue === undefined) { //   object. like array. stringify\n    const v = typeOrData ? 1 : 0\n    buffer = Buffer.from([v])\n    bufferType = '!'\n  } else {\n    throw TypeError('invalid meta buffer type')\n  }\n\n  if (typeof name === 'string' && name.includes('#')) name = '' //\n\n  return [name, bufferType, buffer]\n}\n\nexport const MBA = metaBufferArguments\nexport function metaBufferArguments(...args) {\n  let i = 0\n  const mba = args.map(\n    data => {\n      const argsIndex = i++\n      // tip. MBA use index number as metabuffer's property name.\n      if (typeof data === 'number') {\n        // * JS's primitive Number stored as string.\n        return MB(argsIndex, 'N', data)\n      } else {\n        // typedarray, dataview, array, object, boolean\n        return MB(argsIndex, data)\n      }\n    })\n\n  return mba\n}\n\nexport function parseTypeName(type) {\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    if (type.includes('I')) {\n      return 'int8'\n    } else {\n      return 'uint8'\n    }\n  } else if (type.includes('16')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int16_le'\n      } else {\n        return 'int16_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint16_le'\n      } else {\n        return 'uint16_be'\n      }\n    }\n  } else if (type.includes('32')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int32_le'\n      } else {\n        return 'int32_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint32_le'\n      } else {\n        return 'uint32_be'\n      }\n    }\n  } else if (type.includes('F')) {\n    if (type.includes('L')) {\n      return 'float_le'\n    } else {\n      return 'float_be'\n    }\n  } else if (type === 'B') {\n    return 'buffer'\n  } else if (type === 'S') { // string or arguments\n    return 'string'\n  } else if (type === 'N') { // number encoded as string\n    return 'number'\n  } else if (type === 'O') { // object encoded string\n    return 'object'\n  } else if (type === '!') { // boolean  1:true 0:false\n    return 'boolean'\n  } else {\n    throw TypeError('invalid data type')\n  }\n\n}\n\nexport function readTypedBuffer(simpleType, buffer, offset, length) {\n\n  const type = parseTypeName(simpleType)\n\n  if (type == 'int8') return buffer.readInt8(offset)\n  else if (type === 'uint8') return buffer.readUint8(offset)\n  else if (type === 'int16_le') return buffer.readInt16LE(offset)\n  else if (type === 'int16_be') return buffer.readInt16BE(offset)\n  else if (type === 'uint16_le') return buffer.readUint16LE(offset)\n  else if (type === 'uint16_be') return buffer.readUint16BE(offset)\n  else if (type === 'int32_le') return buffer.readInt32LE(offset)\n  else if (type === 'int32_be') return buffer.readInt32BE(offset)\n  else if (type === 'uint32_le') return buffer.readUint32LE(offset)\n  else if (type === 'uint32_be') return buffer.readUint32BE(offset)\n  else if (type === 'float_le') return buffer.readFloatLE(offset)\n  else if (type === 'float_be') return buffer.readFloatBE(offset)\n\n  else if (type === 'buffer') {\n    return buffer.subarray(offset, offset + length)\n  } else if (type === 'string') {\n    const strBuffer = buffer.subarray(offset, offset + length)\n    return decoder.decode(strBuffer)\n  } else if (type === 'number') {\n    const strNumber = buffer.subarray(offset, offset + length)\n    return Number(decoder.decode(strNumber))\n  } else if (type === 'object') {\n    const objEncoded = buffer.subarray(offset, offset + length)\n    try {\n      return JSON.parse(decoder.decode(objEncoded))\n    } catch (error) {\n      console.log('err. obj parse')\n    }\n  } else if (type === 'boolean') {\n    const v = buffer.readInt8(offset)\n    return v === 1\n  } else {\n    throw TypeError('invalid data')\n  }\n}\n\nfunction flatSubArray(args) {\n  let subArr = []\n  const mainArr = args.filter(item => {\n    if (Array.isArray(item[0])) subArr = subArr.concat(item)\n    else return item\n  })\n  return mainArr.concat(subArr)\n}\n\nexport function pack(...args) {\n  const bufArr = flatSubArray(args)\n  let size = 0\n  const info = []\n  let offset = 0\n\n  bufArr.forEach(bufPack => {\n    const [name, type, data] = bufPack\n    size += data.byteLength\n\n    if (typeof name === 'number' || name.length > 0) {\n    // MBA item use number type name.\n    // MB item use string type name.   null string means omit.\n    \n    // change to store more informative meta info.  \n    info.push([name, type, offset, data.byteLength]) \n    \n    }\n    offset = size\n  })\n\n\n  let infoEncoded\n  let infoSize\n\n  if (info.length > 0) {\n    let infoStr = JSON.stringify(info)\n    // console.log('pack infoStr , size:', infoStr , infoStr.length )\n    infoEncoded = encoder.encode(infoStr)\n    infoSize = infoEncoded.byteLength\n    size = size + infoSize + 2\n  }\n\n  const buffer = Buffer.alloc(size)\n  offset = 0\n  bufArr.forEach(bufPack => {\n    const buf = bufPack[2]\n    buffer.set(buf, offset)\n    offset += buf.byteLength\n  })\n\n  if (info.length > 0) {\n    buffer.set(infoEncoded, offset)\n    const infoSizeBuff = NB('16', infoSize)\n    buffer.set(infoSizeBuff, offset + infoSize)\n    return buffer\n  } else {\n    return buffer\n  }\n}\n\n\n/**\n * unpack() will use embeded meta info from the binary pack.  \n * You can specify (optional) meta obejct. \n * (It's useful to read pure buffer data.)\n * \n * You can get the meta object from:  getFrame(pack) , meta()\n * @param {Buffer|Uint8Array} binPack binaryData\n * @param {Object} meta *OPTION*  \n * @returns {Object|undefined} success: return Object (include buffer data).   fail: return undefined\n */\nexport function unpack(binPack, meta) {\n\n  const infoArr = meta || getMeta(binPack)\n  if (!infoArr) return\n\n  const buffer = Buffer.from(binPack)\n  const binObj = {}\n  let readCounter = 0\n  infoArr.forEach(bufPack => {\n    const [name, type, offset, length] = bufPack\n    binObj[name] = readTypedBuffer(type, buffer, offset, length)\n    // console.log( '###3 len',length )\n    if( length) readCounter += length\n  })\n\n  // Can not define meta for variable size buffer \n  // unpacker support automatic property to read left(did't read) buffers.\n  // console.log(\"######, unpack: buffer \" , readCounter, buffer ,buffer.byteLength)\n  if(  meta && buffer.byteLength !== readCounter ){\n    let leftSize = buffer.byteLength - readCounter\n    // console.log('total,left buffer size', buffer.byteLength, leftSize )\n    binObj[\"$OTHERS\"] = readTypedBuffer('b', buffer, readCounter, leftSize)\n  }\n\n  // set args with values if exist.\n  let mbaIndex = 0;\n  let args = [];\n  while( binObj[mbaIndex]){\n    args.push( binObj[mbaIndex++])\n  }\n  \n  if( args.length > 0 ) {\n    binObj.args = args \n    binObj.$ = binObj.args \n  }\n\n  return binObj\n\n}\n\n\n\nexport const U8 = parseUint8Array   //alias\n/**\n * \n * @param {any} data \n * @param {Boolean} shareArrayBuffer false(default):  return new( or copied) ArrayBuffer.    true: share the input data's arrayBuffer.\n * @returns {Uint8Array}\n */\nexport function parseUint8Array(data, shareArrayBuffer = false) {\n  if (data === undefined) throw TypeError('Invalid data type: Undefined')\n  if (typeof data === 'string') {\n    return encoder.encode(data)\n  } else if (typeof data === 'number') { // number -> 1 byte uint8array(number)\n    return Uint8Array.from([data])\n  } else if (data instanceof ArrayBuffer) { // arraybuffer -> wrap uint8array(ab)\n    if (shareArrayBuffer) {\n      return new Uint8Array(data)\n    } else {\n      const originData = new Uint8Array(data)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else if (ArrayBuffer.isView(data)) { // accept Buffer too.\n    if (shareArrayBuffer) {\n      return new Uint8Array(data.buffer, data.byteOffset, data.byteLength) // DataView, TypedArray >  uint8array( use offset, length )\n    } else {\n      // new memory to protect origin arraybuffer.\n      const originData = new Uint8Array(data.buffer, data.byteOffset, data.byteLength)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else { // array, object\n    return encoder.encode(JSON.stringify(data)) // object(array.. )  > JSON.str > encode > unint8array\n  }\n}\n\nexport const B8 = parseBuffer\n\nexport function parseBuffer(data, shareArrayBuffer = false) {\n\n  const u8 = parseUint8Array(data, shareArrayBuffer)\n  if( shareArrayBuffer){\n    return Buffer.from( u8.buffer, u8.byteOffset, u8.byteLength )\n  }else{\n    return Buffer.from(u8)\n  }\n}\n\nexport const B8pack = parseBufferThenConcat\nexport function parseBufferThenConcat(...dataArray) {\n  const buffers = dataArray.map(data => parseBuffer(data))\n  return Buffer.concat( buffers)\n}\n\n\nexport const U8pack = parseUint8ThenConcat // alias\n/**\n * 1. parse list of data into U8 list\n * 2. return new Uint8Array merged.\n * @param  {...any} dataArray \n * @returns \n */\nexport function parseUint8ThenConcat(...dataArray) {\n  try {\n    let bufferSize = 0\n    let offset = 0\n    const buffers = dataArray.map(data => parseUint8Array(data))\n    buffers.forEach(buf => { bufferSize += buf.byteLength })\n    const buffer = new Uint8Array(bufferSize)\n    buffers.forEach(buf => {\n      buffer.set(buf, offset)\n      offset += buf.byteLength\n    })\n    return buffer\n  } catch (error) {\n    console.log(error)\n  }\n}\n\nexport function hex(buffer) {\n  return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('')\n}\n\nexport function equal(buf1, buf2) {\n  if (buf1.byteLength !== buf2.byteLength) return false\n  for (let i = 0; i < buf1.byteLength; i++) {\n    if (buf1[i] !== buf2[i]) return false\n  }\n  return true\n}\n\n\n\n\nexport function getBufferSize(binPack) {\n  if (getMetaSize(binPack) === 0) {\n    return binPack.byteLength\n  } else {\n    return binPack.byteLength - getMetaSize(binPack) - TAIL_LEN\n  }\n\n}\n\n// MB and MBA \nexport function parseMetaInfo(binPack, infoSize) {\n  let info;\n  try {\n    const buffer = new Uint8Array(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoFrom = buffer.byteLength - infoSize - 2\n    const infoEncoded = buffer.subarray(infoFrom, buffer.byteLength - 2)\n    const decoded = decoder.decode(infoEncoded)\n    const info = JSON.parse(decoded)\n\n    if (!Array.isArray(info) || !Array.isArray(info[0])) return\n\n    let firstItem = info[0]\n    if (!firstItem) return\n\n    if (firstItem.length < 3) return\n    const [name, type, offset] = firstItem\n\n    if ( typeof type !== 'string' || typeof offset !== 'number') return\n\n    return info\n  } catch (error) {\n    // return undefined\n  }\n}\n\n\n/** \n * Meta buffer pack Tail:\n * binary Pack include TAIL(two bytes size) info at the end if it has JSON info.\n * not include TAIL if it has not JSON.\n */\nexport const TAIL_LEN = 2\n\n/**\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @returns {Number} last two byte value( read Uint16 bigendian )\n */\nexport function readTail(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n    if (binPack.byteLength <= TAIL_LEN) return 0\n\n    const dv = new DataView(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoSize = dv.getUint16(binPack.byteLength - TAIL_LEN)  // last 2 bytes for json-info-length.\n    return infoSize\n\n  } else {\n    // throw TypeError('invalid data type.')\n    return 0\n  }\n\n}\n\n\n// binay data pack is not always Buffer.  \n// It should accept Uint8Array binPack.\n// This function don't use Buffer method.\n\nexport function getMetaSize(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n\n    const size = binPack.byteLength\n    if (size <= TAIL_LEN) return 0\n\n    //1. tail size check\n    const infoSize = readTail(binPack)\n    if (infoSize === 0 || infoSize > size) return 0\n    //2. try parse JSON \n    const success = parseMetaInfo(binPack, infoSize)\n    //3. return success: jsonInfoSize,  fail: 0\n    if (success) return infoSize\n    else return 0\n  }else{\n    return 0\n  }\n}\n\n\n/**\n * \n * @param {Buffer|Uint8Array} binPack \n * @returns {Buffer} \n */\nexport function getBuffer(binPack) {\n  const rawBufferSize = getBufferSize(binPack)\n  return binPack.subarray(0, rawBufferSize)\n}\n\n\n\n/**\n * extract Meta info object if it has.\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @param {Boolean} showDetail add additional item info: full data type name and bytelength.\n * @returns {Object|undefined} success: return MetaInfo Object.   fail: return undefined.(No valid JSON included.)\n */\nexport function getMeta(binPack, showDetail = false) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  const infoSize = readTail(binPack)\n  if (infoSize === 0) return\n\n  // check valid Meta\n  let metaInfo = parseMetaInfo(binPack, infoSize)\n  if (!metaInfo) return\n\n  if (!showDetail) {\n    return metaInfo\n  } else {\n    // add additional info\n    metaInfo.forEach(bufPack => {\n      const len = bufPack[3]\n      if (len == undefined) {  // add size info.\n        if (bufPack[1].includes('8')) bufPack[3] = 1\n        else if (bufPack[1].includes('16')) bufPack[3] = 2\n        else if (bufPack[1].includes('32')) bufPack[3] = 4\n        else if (bufPack[1].includes('F')) bufPack[3] = 4\n        else if (bufPack[1].includes('!')) bufPack[3] = 1\n      }\n      bufPack[4] = parseTypeName(bufPack[1])  // add full-type-name.\n    })\n    return metaInfo\n  }\n}\n\nexport function rawPack( ...args){\n  return getBuffer( pack(...args) )\n}\n\nexport function meta( ...args){\n  return getMeta( pack(...args) )\n}\n\nexport function metaDetail( ...args){\n  return getMeta( pack(...args) , true)\n}\n\n\n\nexport function getMetaDetail(binPack) {\n  return getMeta(binPack, true)\n}\n","import { hash as sha256, hmac } from '../lib/fast-sha256.js'\nimport { MBP } from 'meta-buffer-pack'\n\nsha256.hash = function (data) {\n  return sha256(MBP.U8(data))\n}\n\nsha256.hex = function (data) {\n  return MBP.hex(sha256.hash(data))\n}\n\nsha256.hmac = function (key, data) {\n  return hmac(MBP.U8(key), MBP.U8(data))\n}\n\nexport { sha256 }\n","import{ MBP, Buffer} from \"meta-buffer-pack\"\nconst MB = MBP.MB\n\n\n// remocon message pack one byte header. \nexport let BohoMsg = {\n  AUTH_REQ : 0xB0,  \n  AUTH_NONCE: 0xB1,\n  AUTH_HMAC: 0xB2,\n  AUTH_ACK: 0xB3,\n  AUTH_FAIL: 0xB4,\n  AUTH_EXT: 0xB5,\n  ENC_PACK : 0xB6,  \n  ENC_E2E : 0xB7,  \n  ENC_488 : 0xB8\n}\n\nfor (let c in BohoMsg) { BohoMsg[BohoMsg[c]] = c }\n\nexport const Meta = {\n\n  AUTH_REQ: MBP.meta(  // 2\n    MB('header','8', 0),\n    MB('reserved','8', 0)\n  ),\n\n  AUTH_NONCE: MBP.meta(  // 13\n    MB('header','8', 0),\n    MB('unixTime','32L', 0),\n    MB('milTime','32L', 0 ),\n    MB('nonce', Buffer.alloc(4))\n  ),\n\n  AUTH_HMAC: MBP.meta( // 45\n    MB('header','8', 0),\n    MB('id8',Buffer.alloc(8)),\n    MB('nonce', Buffer.alloc(4)),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n  AUTH_ACK: MBP.meta( // 33\n    MB('header','8', 0),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n\n  ENC_PACK: MBP.meta(  //25 + payload\n    MB('type','8',0),\n    MB('len','32L',0),  // pure xdata size.  \n    MB('salt12', Buffer.alloc(12)),  // sec,mil,rand\n    MB('hmac',8,0)\n    // MB( 'xdata', encData )\n    ),\n\n\n  ENC_488: MBP.meta(   // 21 + payload\n    MB('type','8', 0 ),\n    MB('len','32L', 0 ),\n    MB('otpSrc8', Buffer.alloc(8) ),\n    MB('hmac8', Buffer.alloc(8) )\n    // MB('xdata', encData ) \n    )\n\n\n  }\n\n\n  function getMetaSize(meta){\n    let lastItem = meta[ meta.length - 1]\n    return lastItem[2] + lastItem[3]\n  }\n\n  export const MetaSize = {\n    AUTH_REQ: getMetaSize( Meta.AUTH_REQ ),\n    AUTH_NONCE: getMetaSize( Meta.AUTH_NONCE ),\n    AUTH_HMAC: getMetaSize( Meta.AUTH_HMAC ),\n    AUTH_ACK: getMetaSize( Meta.AUTH_ACK ),\n    ENC_PACK: getMetaSize( Meta.ENC_PACK ),\n    ENC_488: getMetaSize( Meta.ENC_488 )\n  }\n\n// console.log( 'boho MetaSize', MetaSize )\n// boho MetaSize {\n//   AUTH_REQ: 2,\n//   AUTH_NONCE: 13,\n//   AUTH_HMAC: 45,\n//   AUTH_ACK: 33,\n//   ENC_PACK: 25,\n//   ENC_488: 21\n// }","import { sha256 } from './sha256-mbp.js'\nimport { MBP, Buffer } from 'meta-buffer-pack'\nexport { sha256, MBP, Buffer }\n\nimport { webcrypto } from 'crypto'\nimport { BohoMsg, Meta, MetaSize } from \"./constants.js\"\nexport { BohoMsg, Meta, MetaSize }\n\nlet isNode = false\ntry {\n  isNode = Object.prototype.toString.call(global.process) === '[object process]'\n} catch (e) { }\n\n\nexport function RAND(size) {\n  if( isNode ){\n    return webcrypto.getRandomValues(Buffer.alloc(size))\n  }else{\n    return self.crypto.getRandomValues(Buffer.alloc(size))\n  }\n}\n\n\n\nexport class Boho {\n  // A. Core\n  constructor() {\n\n    this._id8 = Buffer.alloc(8)\n    this._otpSrc44 = Buffer.alloc(44)\n    this._otp36 = Buffer.alloc(36)\n    this._hmac = Buffer.alloc(32)\n\n    this.auth_salt12 = Buffer.alloc(12)\n    this.localNonce = Buffer.alloc(4)\n    this.remoteNonce = Buffer.alloc(4)\n    this.isAuthorized = false\n\n  }\n\n  clearAuth(){\n    this._id8.fill(0)\n    this._otpSrc44.fill(0)\n    this._otp36.fill(0)\n    this._hmac.fill(0)\n    this.auth_salt12.fill(0)\n    this.localNonce.fill(0)\n    this.remoteNonce.fill(0)\n    this.isAuthorized = false\n  }\n\n  // for the self\n  set_id8(data) {\n    let encStr = MBP.B8(data)\n    this._id8.fill(0)\n    encStr.copy(this._id8, 0, 0, 8)\n  }\n\n  set_hash_id8(data) {\n    let idSum = MBP.B8(sha256.hash(data))\n    idSum.copy(this._id8, 0, 0, 8)\n  }\n\n\n  set_key(data) {\n    let keySum = MBP.B8(sha256.hash(data))\n    keySum.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n  // for the remote client.\n  copy_id8(data) {\n    data.copy(this._id8, 0, 0, 8)\n  }\n\n  // for the remote client.\n  copy_key(data) {\n    data.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n\n  sha256_n(srcData, n) {\n    let hashSum = sha256.hash(srcData)\n    for (let i = 0; i < n; i++) hashSum = sha256.hash(hashSum)\n    return hashSum\n  }\n\n\n  // useful general encryption  i.e. enc_pack\n  set_clock_rand() {\n\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      RAND(4)\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  // for secure communication sender. \n  set_clock_nonce(nonce) {\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      nonce\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n\n  set_salt12(salt12) {\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  resetOTP() {\n    let otp32 = MBP.B8(sha256.hash(this._otpSrc44))\n    otp32.copy(this._otp36, 0, 0, 32)\n  }\n\n  getIndexOTP(otpIndex) {\n    this._otp36.writeUInt32LE(otpIndex, 32)\n    return sha256.hash(this._otp36)\n  }\n\n\n  generateHMAC(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n  }\n\n  // return 8 bytes of hash\n  getHMAC8(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n    return this._hmac.subarray(0, 8)\n  }\n\n  xotp(data, otpStartIndex = 0, shareDataBuffer = false) {\n\n    data = MBP.B8(data, shareDataBuffer)\n\n    let len = data.byteLength\n    let otpIndex = otpStartIndex\n    let dataOffset = 0\n    let xorCalcLen = 0\n\n    while (len > 0) {\n      xorCalcLen = len < 32 ? len : 32\n      let iotp = this.getIndexOTP(++otpIndex);\n      for (let i = 0; i < xorCalcLen; i++) {\n        data[dataOffset++] ^= iotp[i]\n      }\n      len -= 32\n    }\n    return data\n  }\n\n  // B. AUTH process\n\n  // step 1\n  // client send AUTH_REQ\n  auth_req() {\n    return MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.AUTH_REQ),\n      MBP.MB('#reserved', '8', 0)\n    )\n  }\n\n  // step 2\n  // server send AUTH_NONCE\n  auth_nonce() {\n    let now = Date.now()\n    let unixTime = Math.floor(now / 1000)\n    let milTime = now % 1000\n    this.localNonce = RAND(4)\n    this.auth_salt12 = Buffer.concat([\n     MBP.NB('32L', unixTime),\n     MBP.NB('32L', milTime),\n      this.localNonce\n    ])\n\n    let infoPack = Buffer.concat([\n     MBP.NB('8', BohoMsg.AUTH_NONCE),\n      this.auth_salt12\n    ])\n    return infoPack\n  }\n\n\n  // step 3\n  // client send AUTH_HMAC\n  // input :  auth_nonce buffer\n  auth_hmac(buffer) {\n    let auth_nonce = MBP.unpack(buffer, Meta.AUTH_NONCE)\n    if (auth_nonce) {\n      // console.log(' auth nonce', auth_nonce )\n\n      // let now = Date.now()\n      // let localUTC= Math.floor( now/ 1000 )\n      // let localMilTime = now % 1000\n\n      // console.log('time server [sec]', auth_nonce.unixTime, auth_nonce.milTime )\n      // console.log('time client [sec]', localUTC , localMilTime )\n      // console.log('time diff client and server[sec]', auth_nonce.unixTime - localUTC )\n\n      // let serverSecMil = auth_nonce.unixTime * 1000 + auth_nonce.milTime\n      // console.log('time diff msec client and server[msec]', serverSecMil - now )\n\n      let salt12 = Buffer.concat([\n       MBP.NB('32L', auth_nonce.unixTime),\n       MBP.NB('32L', auth_nonce.milTime),\n        auth_nonce.nonce\n      ])\n\n      this.set_salt12(salt12)\n\n      this.localNonce = RAND(4)\n      // hmac( key, sec,mil,serverNonce, localNonce)\n      this.generateHMAC(this.localNonce)\n\n      // let hmac8 = this._hmac.subarray(0, 8)\n\n      this.remoteNonce = auth_nonce.nonce\n\n      let auth_hmac_buffer = MBP.pack( // 21 -> 45\n       MBP.MB('#header', '8', BohoMsg.AUTH_HMAC),\n       MBP.MB('#id8', this._id8),\n       MBP.MB('#nonce', this.localNonce),\n       MBP.MB('#hmac32', this._hmac ), //full 32bytes hash\n      )\n\n      return auth_hmac_buffer\n    }\n    return false\n  }\n\n  /*  \n      step 4.  for server\n  \n      step 4-1. check client's auth_hmac\n      step 4-2. reply result\n          send AUTH_ACK  with another HMAC for client.\n          or send AUTH_FAIL when fail.\n   */\n\n  // input: unpack object or buffer of auth_hmac\n  check_auth_hmac(data) {\n    let infoPack\n    if (data instanceof Uint8Array) {\n      infoPack = MBP.unpack(data, Meta.AUTH_HMAC)\n      if (!infoPack) {\n        // console.log('auth_hamc unpack fail.')\n        return\n      }\n    } else {\n      infoPack = data;\n\n    }\n    // console.log('auth_hamc infoObj', infoPack )\n\n    this.set_salt12(this.auth_salt12)\n\n    // hmac( key, sec,mil,serverNonce, clientNonce)\n    this.generateHMAC(infoPack.nonce)\n    // let hmac8 = this._hmac.subarray(0, 8)\n    let hmac32 = this._hmac\n\n    if (MBP.equal(infoPack.hmac32, hmac32)) {\n      //Auth success then store client nonce.\n      this.remoteNonce = infoPack.nonce\n\n      let salt12 = Buffer.concat([\n        this.localNonce,\n        this.remoteNonce,\n        this.localNonce\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(infoPack.nonce)\n      let replyHMAC = this._hmac\n\n      let auth_ack = MBP.rawPack( \n       MBP.MB('header', '8', BohoMsg.AUTH_ACK),\n       MBP.MB('hmac32', replyHMAC)\n      )\n      this.isAuthorized = true\n      return auth_ack\n    }\n    return false\n  }\n\n\n\n  // step 5.  cross check\n  // client check server's hmac.  \n  check_auth_ack_hmac(buffer) {\n    // server response has hmac ( key + clientNonce)\n    let auth_ack = MBP.unpack(buffer, Meta.AUTH_ACK)\n    if (auth_ack) {\n      let salt12 = Buffer.concat([\n        this.remoteNonce,\n        this.localNonce,\n        this.remoteNonce,\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(this.localNonce)\n      // let hmac8 = this._hmac.subarray(0, 8)\n      let hmac32 = this._hmac\n      //server side hmac using client nonce.\n      if (MBP.equal(hmac32, auth_ack.hmac32)) {\n        this.isAuthorized = true\n        return true\n      }\n    }\n    // server hmac error\n    return\n  }\n\n  // C. Secure Communication\n\n  // Must AUTH first.\n  encrypt_488(data) {  // payload max about 2^32 bytes.\n    if (!this.isAuthorized) return\n\n    data = MBP.B8(data)\n\n    this.set_clock_nonce(this.remoteNonce)\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_488),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#otpSrc8', this._otpSrc44.subarray(32, 40)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    // console.log('enc pack result', pack )\n    return pack\n  }\n\n\n  decrypt_488(data) {\n    data = MBP.B8(data)\n\n    let pack = MBP.unpack(data, Meta.ENC_488)\n\n    if (pack) {\n\n      let salt12 = Buffer.concat([\n        pack.otpSrc8,\n        this.localNonce\n      ])\n\n      this.set_salt12(salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS.subarray(0, pack.len)\n      let decData = this.xotp(xdata)\n\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(hmac8, pack.hmac8)) return decData\n\n      // console.log('hmac dismatch', decData )\n    } else {\n      // console.log('unpack fail')\n    }\n  }\n\n\n  // maxium data size is 2**32 -1 bytes.\n  encryptPack(data) {\n    data = MBP.B8(data)\n\n    this.set_clock_rand()\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_PACK),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#salt12', this._otpSrc44.subarray(32)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    return pack\n  }\n\n\n  decryptPack(data) {\n\n    if (data[0] !== BohoMsg.ENC_PACK) {\n      // console.log('Boho: Invalid packType')\n      return\n    }\n\n    // packLength\n    let readPackLen = data.readUint32LE(1);\n    if (readPackLen != data.byteLength - MetaSize.ENC_PACK) {\n      // console.log('Boho: Invalid LEN data_len: data.byteLen' , readPackLen, data.byteLength)\n      return\n    }\n\n    try {\n      let pack = MBP.unpack(data, Meta.ENC_PACK)\n      //  console.log('unpack result', pack )\n      if (!pack) return\n\n      this.set_salt12(pack.salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS\n      let decData = this.xotp(xdata)\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(pack.hmac, hmac8)) {\n        pack.data = decData\n        return pack\n      }\n      // console.log('Invalid HMAC', pack.hmac, hmac8 )\n\n    } catch (error) {\n      // console.log('Boho: unpack err', error )\n\n    }\n  }\n\n  encrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let pack = this.encryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return pack;\n  }\n\n  decrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let decPack = this.decryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return decPack\n  }\n\n}\n","import { Boho, RAND, MBP, BohoMsg, Meta, MetaSize , sha256, Buffer } from './boho.js'\n\nBoho.RAND = RAND;\nBoho.BohoMsg = BohoMsg;\nBoho.Meta = Meta;\nBoho.MetaSize = MetaSize;\nBoho.sha256 = sha256;\nBoho.MBP = MBP;\nBoho.Buffer = Buffer;\n\nexport default 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+{"version":3,"file":"boho.min.js","sources":["../lib/fast-sha256.js","../node_modules/base64-js/index.js","../node_modules/ieee754/index.js","../node_modules/buffer/index.js","../node_modules/meta-buffer-pack/src/meta-buffer-pack.js","../src/sha256-mbp.js","../src/constants.js","../src/boho.js","../src/browserDefault.js"],"sourcesContent":["// SHA-256 (+ HMAC and PBKDF2) for JavaScript.\n//\n// Written in 2014-2016 by Dmitry Chestnykh.\n// Public domain, no warranty.\n//\n// Functions (accept and return Uint8Arrays):\n//\n//   sha256(message) -> hash\n//   sha256.hmac(key, message) -> mac\n//   sha256.pbkdf2(password, salt, rounds, dkLen) -> dk\n//\n//  Classes:\n//\n//   new sha256.Hash()\n//   new sha256.HMAC(key)\n//\nexport var digestLength = 32\nexport var blockSize = 64\n// SHA-256 constants\nconst K = new Uint32Array([\n  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,\n  0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,\n  0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,\n  0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,\n  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,\n  0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,\n  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,\n  0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,\n  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,\n  0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,\n  0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,\n  0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,\n  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2\n])\nfunction hashBlocks (w, v, p, pos, len) {\n  let a, b, c, d, e, f, g, h, u, i, j, t1, t2\n  while (len >= 64) {\n    a = v[0]\n    b = v[1]\n    c = v[2]\n    d = v[3]\n    e = v[4]\n    f = v[5]\n    g = v[6]\n    h = v[7]\n    for (i = 0; i < 16; i++) {\n      j = pos + i * 4\n      w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |\n                ((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff))\n    }\n    for (i = 16; i < 64; i++) {\n      u = w[i - 2]\n      t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10)\n      u = w[i - 15]\n      t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3)\n      w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0)\n    }\n    for (i = 0; i < 64; i++) {\n      t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^\n                (e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +\n                ((h + ((K[i] + w[i]) | 0)) | 0)) | 0\n      t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^\n                (a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 0\n      h = g\n      g = f\n      f = e\n      e = (d + t1) | 0\n      d = c\n      c = b\n      b = a\n      a = (t1 + t2) | 0\n    }\n    v[0] += a\n    v[1] += b\n    v[2] += c\n    v[3] += d\n    v[4] += e\n    v[5] += f\n    v[6] += g\n    v[7] += h\n    pos += 64\n    len -= 64\n  }\n  return pos\n}\n// Hash implements SHA256 hash algorithm.\nconst Hash = /** @class */ (function () {\n  function Hash () {\n    this.digestLength = digestLength\n    this.blockSize = blockSize\n    // Note: Int32Array is used instead of Uint32Array for performance reasons.\n    this.state = new Int32Array(8) // hash state\n    this.temp = new Int32Array(64) // temporary state\n    this.buffer = new Uint8Array(128) // buffer for data to hash\n    this.bufferLength = 0 // number of bytes in buffer\n    this.bytesHashed = 0 // number of total bytes hashed\n    this.finished = false // indicates whether the hash was finalized\n    this.reset()\n  }\n  // Resets hash state making it possible\n  // to re-use this instance to hash other data.\n  Hash.prototype.reset = function () {\n    this.state[0] = 0x6a09e667\n    this.state[1] = 0xbb67ae85\n    this.state[2] = 0x3c6ef372\n    this.state[3] = 0xa54ff53a\n    this.state[4] = 0x510e527f\n    this.state[5] = 0x9b05688c\n    this.state[6] = 0x1f83d9ab\n    this.state[7] = 0x5be0cd19\n    this.bufferLength = 0\n    this.bytesHashed = 0\n    this.finished = false\n    return this\n  }\n  // Cleans internal buffers and re-initializes hash state.\n  Hash.prototype.clean = function () {\n    for (var i = 0; i < this.buffer.length; i++) {\n      this.buffer[i] = 0\n    }\n    for (var i = 0; i < this.temp.length; i++) {\n      this.temp[i] = 0\n    }\n    this.reset()\n  }\n  // Updates hash state with the given data.\n  //\n  // Optionally, length of the data can be specified to hash\n  // fewer bytes than data.length.\n  //\n  // Throws error when trying to update already finalized hash:\n  // instance must be reset to use it again.\n  Hash.prototype.update = function (data, dataLength) {\n    if (dataLength === void 0) { dataLength = data.length }\n    if (this.finished) {\n      throw new Error(\"SHA256: can't update because hash was finished.\")\n    }\n    let dataPos = 0\n    this.bytesHashed += dataLength\n    if (this.bufferLength > 0) {\n      while (this.bufferLength < 64 && dataLength > 0) {\n        this.buffer[this.bufferLength++] = data[dataPos++]\n        dataLength--\n      }\n      if (this.bufferLength === 64) {\n        hashBlocks(this.temp, this.state, this.buffer, 0, 64)\n        this.bufferLength = 0\n      }\n    }\n    if (dataLength >= 64) {\n      dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength)\n      dataLength %= 64\n    }\n    while (dataLength > 0) {\n      this.buffer[this.bufferLength++] = data[dataPos++]\n      dataLength--\n    }\n    return this\n  }\n  // Finalizes hash state and puts hash into out.\n  //\n  // If hash was already finalized, puts the same value.\n  Hash.prototype.finish = function (out) {\n    if (!this.finished) {\n      const bytesHashed = this.bytesHashed\n      const left = this.bufferLength\n      const bitLenHi = (bytesHashed / 0x20000000) | 0\n      const bitLenLo = bytesHashed << 3\n      const padLength = (bytesHashed % 64 < 56) ? 64 : 128\n      this.buffer[left] = 0x80\n      for (var i = left + 1; i < padLength - 8; i++) {\n        this.buffer[i] = 0\n      }\n      this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff\n      this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff\n      this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff\n      this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff\n      this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff\n      this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff\n      this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff\n      this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff\n      hashBlocks(this.temp, this.state, this.buffer, 0, padLength)\n      this.finished = true\n    }\n    for (var i = 0; i < 8; i++) {\n      out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff\n      out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff\n      out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff\n      out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff\n    }\n    return this\n  }\n  // Returns the final hash digest.\n  Hash.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._saveState = function (out) {\n    for (let i = 0; i < this.state.length; i++) {\n      out[i] = this.state[i]\n    }\n  }\n  // Internal function for use in HMAC for optimization.\n  Hash.prototype._restoreState = function (from, bytesHashed) {\n    for (let i = 0; i < this.state.length; i++) {\n      this.state[i] = from[i]\n    }\n    this.bytesHashed = bytesHashed\n    this.finished = false\n    this.bufferLength = 0\n  }\n  return Hash\n}())\nexport { Hash }\n// HMAC implements HMAC-SHA256 message authentication algorithm.\nconst HMAC = /** @class */ (function () {\n  function HMAC (key) {\n    this.inner = new Hash()\n    this.outer = new Hash()\n    this.blockSize = this.inner.blockSize\n    this.digestLength = this.inner.digestLength\n    const pad = new Uint8Array(this.blockSize)\n    if (key.length > this.blockSize) {\n      (new Hash()).update(key).finish(pad).clean()\n    } else {\n      for (var i = 0; i < key.length; i++) {\n        pad[i] = key[i]\n      }\n    }\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36\n    }\n    this.inner.update(pad)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] ^= 0x36 ^ 0x5c\n    }\n    this.outer.update(pad)\n    this.istate = new Uint32Array(8)\n    this.ostate = new Uint32Array(8)\n    this.inner._saveState(this.istate)\n    this.outer._saveState(this.ostate)\n    for (var i = 0; i < pad.length; i++) {\n      pad[i] = 0\n    }\n  }\n  // Returns HMAC state to the state initialized with key\n  // to make it possible to run HMAC over the other data with the same\n  // key without creating a new instance.\n  HMAC.prototype.reset = function () {\n    this.inner._restoreState(this.istate, this.inner.blockSize)\n    this.outer._restoreState(this.ostate, this.outer.blockSize)\n    return this\n  }\n  // Cleans HMAC state.\n  HMAC.prototype.clean = function () {\n    for (let i = 0; i < this.istate.length; i++) {\n      this.ostate[i] = this.istate[i] = 0\n    }\n    this.inner.clean()\n    this.outer.clean()\n  }\n  // Updates state with provided data.\n  HMAC.prototype.update = function (data) {\n    this.inner.update(data)\n    return this\n  }\n  // Finalizes HMAC and puts the result in out.\n  HMAC.prototype.finish = function (out) {\n    if (this.outer.finished) {\n      this.outer.finish(out)\n    } else {\n      this.inner.finish(out)\n      this.outer.update(out, this.digestLength).finish(out)\n    }\n    return this\n  }\n  // Returns message authentication code.\n  HMAC.prototype.digest = function () {\n    const out = new Uint8Array(this.digestLength)\n    this.finish(out)\n    return out\n  }\n  return HMAC\n}())\nexport { HMAC }\n// Returns SHA256 hash of data.\nexport function hash (data) {\n  const h = (new Hash()).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Function hash is both available as module.hash and as default export.\nexport default hash\n// Returns HMAC-SHA256 of data under the key.\nexport function hmac (key, data) {\n  const h = (new HMAC(key)).update(data)\n  const digest = h.digest()\n  h.clean()\n  return digest\n}\n// Fills hkdf buffer like this:\n// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)\nfunction fillBuffer (buffer, hmac, info, counter) {\n  // Counter is a byte value: check if it overflowed.\n  const num = counter[0]\n  if (num === 0) {\n    throw new Error('hkdf: cannot expand more')\n  }\n  // Prepare HMAC instance for new data with old key.\n  hmac.reset()\n  // Hash in previous output if it was generated\n  // (i.e. counter is greater than 1).\n  if (num > 1) {\n    hmac.update(buffer)\n  }\n  // Hash in info if it exists.\n  if (info) {\n    hmac.update(info)\n  }\n  // Hash in the counter.\n  hmac.update(counter)\n  // Output result to buffer and clean HMAC instance.\n  hmac.finish(buffer)\n  // Increment counter inside typed array, this works properly.\n  counter[0]++\n}\nconst hkdfSalt = new Uint8Array(digestLength) // Filled with zeroes.\nexport function hkdf (key, salt, info, length) {\n  if (salt === void 0) { salt = hkdfSalt }\n  if (length === void 0) { length = 32 }\n  const counter = new Uint8Array([1])\n  // HKDF-Extract uses salt as HMAC key, and key as data.\n  const okm = hmac(salt, key)\n  // Initialize HMAC for expanding with extracted key.\n  // Ensure no collisions with `hmac` function.\n  const hmac_ = new HMAC(okm)\n  // Allocate buffer.\n  const buffer = new Uint8Array(hmac_.digestLength)\n  let bufpos = buffer.length\n  const out = new Uint8Array(length)\n  for (let i = 0; i < length; i++) {\n    if (bufpos === buffer.length) {\n      fillBuffer(buffer, hmac_, info, counter)\n      bufpos = 0\n    }\n    out[i] = buffer[bufpos++]\n  }\n  hmac_.clean()\n  buffer.fill(0)\n  counter.fill(0)\n  return out\n}\n// Derives a key from password and salt using PBKDF2-HMAC-SHA256\n// with the given number of iterations.\n//\n// The number of bytes returned is equal to dkLen.\n//\n// (For better security, avoid dkLen greater than hash length - 32 bytes).\nexport function pbkdf2 (password, salt, iterations, dkLen) {\n  const prf = new HMAC(password)\n  const len = prf.digestLength\n  const ctr = new Uint8Array(4)\n  const t = new Uint8Array(len)\n  const u = new Uint8Array(len)\n  const dk = new Uint8Array(dkLen)\n  for (var i = 0; i * len < dkLen; i++) {\n    const c = i + 1\n    ctr[0] = (c >>> 24) & 0xff\n    ctr[1] = (c >>> 16) & 0xff\n    ctr[2] = (c >>> 8) & 0xff\n    ctr[3] = (c >>> 0) & 0xff\n    prf.reset()\n    prf.update(salt)\n    prf.update(ctr)\n    prf.finish(u)\n    for (var j = 0; j < len; j++) {\n      t[j] = u[j]\n    }\n    for (var j = 2; j <= iterations; j++) {\n      prf.reset()\n      prf.update(u).finish(u)\n      for (let k = 0; k < len; k++) {\n        t[k] ^= u[k]\n      }\n    }\n    for (var j = 0; j < len && i * len + j < dkLen; j++) {\n      dk[i * len + j] = t[j]\n    }\n  }\n  for (var i = 0; i < len; i++) {\n    t[i] = u[i] = 0\n  }\n  for (var i = 0; i < 4; i++) {\n    ctr[i] = 0\n  }\n  prf.clean()\n  return dk\n}\n","'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\n// Support decoding URL-safe base64 strings, as Node.js does.\n// See: https://en.wikipedia.org/wiki/Base64#URL_applications\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction getLens (b64) {\n  var len = b64.length\n\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // Trim off extra bytes after placeholder bytes are found\n  // See: https://github.com/beatgammit/base64-js/issues/42\n  var validLen = b64.indexOf('=')\n  if (validLen === -1) validLen = len\n\n  var placeHoldersLen = validLen === len\n    ? 0\n    : 4 - (validLen % 4)\n\n  return [validLen, placeHoldersLen]\n}\n\n// base64 is 4/3 + up to two characters of the original data\nfunction byteLength (b64) {\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction _byteLength (b64, validLen, placeHoldersLen) {\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction toByteArray (b64) {\n  var tmp\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n\n  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))\n\n  var curByte = 0\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  var len = placeHoldersLen > 0\n    ? validLen - 4\n    : validLen\n\n  var i\n  for (i = 0; i < len; i += 4) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 18) |\n      (revLookup[b64.charCodeAt(i + 1)] << 12) |\n      (revLookup[b64.charCodeAt(i + 2)] << 6) |\n      revLookup[b64.charCodeAt(i + 3)]\n    arr[curByte++] = (tmp >> 16) & 0xFF\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 2) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 2) |\n      (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 1) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 10) |\n      (revLookup[b64.charCodeAt(i + 1)] << 4) |\n      (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] +\n    lookup[num >> 12 & 0x3F] +\n    lookup[num >> 6 & 0x3F] +\n    lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp =\n      ((uint8[i] << 16) & 0xFF0000) +\n      ((uint8[i + 1] << 8) & 0xFF00) +\n      (uint8[i + 2] & 0xFF)\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 2] +\n      lookup[(tmp << 4) & 0x3F] +\n      '=='\n    )\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 10] +\n      lookup[(tmp >> 4) & 0x3F] +\n      lookup[(tmp << 2) & 0x3F] +\n      '='\n    )\n  }\n\n  return parts.join('')\n}\n","/*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */\nexports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n","/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <https://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nconst base64 = require('base64-js')\nconst ieee754 = require('ieee754')\nconst customInspectSymbol =\n  (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation\n    ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation\n    : null\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\nconst K_MAX_LENGTH = 0x7fffffff\nexports.kMaxLength = K_MAX_LENGTH\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Print warning and recommend using `buffer` v4.x which has an Object\n *               implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * We report that the browser does not support typed arrays if the are not subclassable\n * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`\n * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support\n * for __proto__ and has a buggy typed array implementation.\n */\nBuffer.TYPED_ARRAY_SUPPORT = typedArraySupport()\n\nif (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&\n    typeof console.error === 'function') {\n  console.error(\n    'This browser lacks typed array (Uint8Array) support which is required by ' +\n    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'\n  )\n}\n\nfunction typedArraySupport () {\n  // Can typed array instances can be augmented?\n  try {\n    const arr = new Uint8Array(1)\n    const proto = { foo: function () { return 42 } }\n    Object.setPrototypeOf(proto, Uint8Array.prototype)\n    Object.setPrototypeOf(arr, proto)\n    return arr.foo() === 42\n  } catch (e) {\n    return false\n  }\n}\n\nObject.defineProperty(Buffer.prototype, 'parent', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.buffer\n  }\n})\n\nObject.defineProperty(Buffer.prototype, 'offset', {\n  enumerable: true,\n  get: function () {\n    if (!Buffer.isBuffer(this)) return undefined\n    return this.byteOffset\n  }\n})\n\nfunction createBuffer (length) {\n  if (length > K_MAX_LENGTH) {\n    throw new RangeError('The value \"' + length + '\" is invalid for option \"size\"')\n  }\n  // Return an augmented `Uint8Array` instance\n  const buf = new Uint8Array(length)\n  Object.setPrototypeOf(buf, Buffer.prototype)\n  return buf\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new TypeError(\n        'The \"string\" argument must be of type string. Received type number'\n      )\n    }\n    return allocUnsafe(arg)\n  }\n  return from(arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\nfunction from (value, encodingOrOffset, length) {\n  if (typeof value === 'string') {\n    return fromString(value, encodingOrOffset)\n  }\n\n  if (ArrayBuffer.isView(value)) {\n    return fromArrayView(value)\n  }\n\n  if (value == null) {\n    throw new TypeError(\n      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n      'or Array-like Object. Received type ' + (typeof value)\n    )\n  }\n\n  if (isInstance(value, ArrayBuffer) ||\n      (value && isInstance(value.buffer, ArrayBuffer))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof SharedArrayBuffer !== 'undefined' &&\n      (isInstance(value, SharedArrayBuffer) ||\n      (value && isInstance(value.buffer, SharedArrayBuffer)))) {\n    return fromArrayBuffer(value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'number') {\n    throw new TypeError(\n      'The \"value\" argument must not be of type number. Received type number'\n    )\n  }\n\n  const valueOf = value.valueOf && value.valueOf()\n  if (valueOf != null && valueOf !== value) {\n    return Buffer.from(valueOf, encodingOrOffset, length)\n  }\n\n  const b = fromObject(value)\n  if (b) return b\n\n  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&\n      typeof value[Symbol.toPrimitive] === 'function') {\n    return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)\n  }\n\n  throw new TypeError(\n    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +\n    'or Array-like Object. Received type ' + (typeof value)\n  )\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(value, encodingOrOffset, length)\n}\n\n// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:\n// https://github.com/feross/buffer/pull/148\nObject.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)\nObject.setPrototypeOf(Buffer, Uint8Array)\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be of type number')\n  } else if (size < 0) {\n    throw new RangeError('The value \"' + size + '\" is invalid for option \"size\"')\n  }\n}\n\nfunction alloc (size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpreted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(size).fill(fill, encoding)\n      : createBuffer(size).fill(fill)\n  }\n  return createBuffer(size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(size, fill, encoding)\n}\n\nfunction allocUnsafe (size) {\n  assertSize(size)\n  return createBuffer(size < 0 ? 0 : checked(size) | 0)\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(size)\n}\n\nfunction fromString (string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('Unknown encoding: ' + encoding)\n  }\n\n  const length = byteLength(string, encoding) | 0\n  let buf = createBuffer(length)\n\n  const actual = buf.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    buf = buf.slice(0, actual)\n  }\n\n  return buf\n}\n\nfunction fromArrayLike (array) {\n  const length = array.length < 0 ? 0 : checked(array.length) | 0\n  const buf = createBuffer(length)\n  for (let i = 0; i < length; i += 1) {\n    buf[i] = array[i] & 255\n  }\n  return buf\n}\n\nfunction fromArrayView (arrayView) {\n  if (isInstance(arrayView, Uint8Array)) {\n    const copy = new Uint8Array(arrayView)\n    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)\n  }\n  return fromArrayLike(arrayView)\n}\n\nfunction fromArrayBuffer (array, byteOffset, length) {\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\"offset\" is outside of buffer bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\"length\" is outside of buffer bounds')\n  }\n\n  let buf\n  if (byteOffset === undefined && length === undefined) {\n    buf = new Uint8Array(array)\n  } else if (length === undefined) {\n    buf = new Uint8Array(array, byteOffset)\n  } else {\n    buf = new Uint8Array(array, byteOffset, length)\n  }\n\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(buf, Buffer.prototype)\n\n  return buf\n}\n\nfunction fromObject (obj) {\n  if (Buffer.isBuffer(obj)) {\n    const len = checked(obj.length) | 0\n    const buf = createBuffer(len)\n\n    if (buf.length === 0) {\n      return buf\n    }\n\n    obj.copy(buf, 0, 0, len)\n    return buf\n  }\n\n  if (obj.length !== undefined) {\n    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {\n      return createBuffer(0)\n    }\n    return fromArrayLike(obj)\n  }\n\n  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {\n    return fromArrayLike(obj.data)\n  }\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= K_MAX_LENGTH) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return b != null && b._isBuffer === true &&\n    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false\n}\n\nBuffer.compare = function compare (a, b) {\n  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)\n  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError(\n      'The \"buf1\", \"buf2\" arguments must be one of type Buffer or Uint8Array'\n    )\n  }\n\n  if (a === b) return 0\n\n  let x = a.length\n  let y = b.length\n\n  for (let i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!Array.isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  let i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  const buffer = Buffer.allocUnsafe(length)\n  let pos = 0\n  for (i = 0; i < list.length; ++i) {\n    let buf = list[i]\n    if (isInstance(buf, Uint8Array)) {\n      if (pos + buf.length > buffer.length) {\n        if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf)\n        buf.copy(buffer, pos)\n      } else {\n        Uint8Array.prototype.set.call(\n          buffer,\n          buf,\n          pos\n        )\n      }\n    } else if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    } else {\n      buf.copy(buffer, pos)\n    }\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    throw new TypeError(\n      'The \"string\" argument must be one of type string, Buffer, or ArrayBuffer. ' +\n      'Received type ' + typeof string\n    )\n  }\n\n  const len = string.length\n  const mustMatch = (arguments.length > 2 && arguments[2] === true)\n  if (!mustMatch && len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) {\n          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8\n        }\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  let loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coercion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)\n// to detect a Buffer instance. It's not possible to use `instanceof Buffer`\n// reliably in a browserify context because there could be multiple different\n// copies of the 'buffer' package in use. This method works even for Buffer\n// instances that were created from another copy of the `buffer` package.\n// See: https://github.com/feross/buffer/issues/154\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  const i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  const len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (let i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  const len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (let i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  const len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (let i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  const length = this.length\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.toLocaleString = Buffer.prototype.toString\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  let str = ''\n  const max = exports.INSPECT_MAX_BYTES\n  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()\n  if (this.length > max) str += ' ... '\n  return '<Buffer ' + str + '>'\n}\nif (customInspectSymbol) {\n  Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (isInstance(target, Uint8Array)) {\n    target = Buffer.from(target, target.offset, target.byteLength)\n  }\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError(\n      'The \"target\" argument must be one of type Buffer or Uint8Array. ' +\n      'Received type ' + (typeof target)\n    )\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  let x = thisEnd - thisStart\n  let y = end - start\n  const len = Math.min(x, y)\n\n  const thisCopy = this.slice(thisStart, thisEnd)\n  const targetCopy = target.slice(start, end)\n\n  for (let i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset // Coerce to Number.\n  if (numberIsNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  let indexSize = 1\n  let arrLength = arr.length\n  let valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  let i\n  if (dir) {\n    let foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      let found = true\n      for (let j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  const remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  const strLen = string.length\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  let i\n  for (i = 0; i < length; ++i) {\n    const parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (numberIsNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset >>> 0\n    if (isFinite(length)) {\n      length = length >>> 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  const remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  let loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return asciiWrite(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  const res = []\n\n  let i = start\n  while (i < end) {\n    const firstByte = buf[i]\n    let codePoint = null\n    let bytesPerSequence = (firstByte > 0xEF)\n      ? 4\n      : (firstByte > 0xDF)\n          ? 3\n          : (firstByte > 0xBF)\n              ? 2\n              : 1\n\n    if (i + bytesPerSequence <= end) {\n      let secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nconst MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  const len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  let res = ''\n  let i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  let ret = ''\n  end = Math.min(buf.length, end)\n\n  for (let i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  const len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  let out = ''\n  for (let i = start; i < end; ++i) {\n    out += hexSliceLookupTable[buf[i]]\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  const bytes = buf.slice(start, end)\n  let res = ''\n  // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)\n  for (let i = 0; i < bytes.length - 1; i += 2) {\n    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  const len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  const newBuf = this.subarray(start, end)\n  // Return an augmented `Uint8Array` instance\n  Object.setPrototypeOf(newBuf, Buffer.prototype)\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUintLE =\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUintBE =\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  let val = this[offset + --byteLength]\n  let mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUint8 =\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUint16LE =\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUint16BE =\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUint32LE =\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUint32BE =\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readBigUInt64LE = defineBigIntMethod(function readBigUInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const lo = first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24\n\n  const hi = this[++offset] +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    last * 2 ** 24\n\n  return BigInt(lo) + (BigInt(hi) << BigInt(32))\n})\n\nBuffer.prototype.readBigUInt64BE = defineBigIntMethod(function readBigUInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const hi = first * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  const lo = this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last\n\n  return (BigInt(hi) << BigInt(32)) + BigInt(lo)\n})\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let val = this[offset]\n  let mul = 1\n  let i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  let i = byteLength\n  let mul = 1\n  let val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  const val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readBigInt64LE = defineBigIntMethod(function readBigInt64LE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = this[offset + 4] +\n    this[offset + 5] * 2 ** 8 +\n    this[offset + 6] * 2 ** 16 +\n    (last << 24) // Overflow\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(first +\n    this[++offset] * 2 ** 8 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 24)\n})\n\nBuffer.prototype.readBigInt64BE = defineBigIntMethod(function readBigInt64BE (offset) {\n  offset = offset >>> 0\n  validateNumber(offset, 'offset')\n  const first = this[offset]\n  const last = this[offset + 7]\n  if (first === undefined || last === undefined) {\n    boundsError(offset, this.length - 8)\n  }\n\n  const val = (first << 24) + // Overflow\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    this[++offset]\n\n  return (BigInt(val) << BigInt(32)) +\n    BigInt(this[++offset] * 2 ** 24 +\n    this[++offset] * 2 ** 16 +\n    this[++offset] * 2 ** 8 +\n    last)\n})\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  offset = offset >>> 0\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUintLE =\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let mul = 1\n  let i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUintBE =\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  byteLength = byteLength >>> 0\n  if (!noAssert) {\n    const maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUint8 =\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeUint16LE =\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint16BE =\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeUint32LE =\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset + 3] = (value >>> 24)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 1] = (value >>> 8)\n  this[offset] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeUint32BE =\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nfunction wrtBigUInt64LE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  lo = lo >> 8\n  buf[offset++] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  hi = hi >> 8\n  buf[offset++] = hi\n  return offset\n}\n\nfunction wrtBigUInt64BE (buf, value, offset, min, max) {\n  checkIntBI(value, min, max, buf, offset, 7)\n\n  let lo = Number(value & BigInt(0xffffffff))\n  buf[offset + 7] = lo\n  lo = lo >> 8\n  buf[offset + 6] = lo\n  lo = lo >> 8\n  buf[offset + 5] = lo\n  lo = lo >> 8\n  buf[offset + 4] = lo\n  let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))\n  buf[offset + 3] = hi\n  hi = hi >> 8\n  buf[offset + 2] = hi\n  hi = hi >> 8\n  buf[offset + 1] = hi\n  hi = hi >> 8\n  buf[offset] = hi\n  return offset + 8\n}\n\nBuffer.prototype.writeBigUInt64LE = defineBigIntMethod(function writeBigUInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeBigUInt64BE = defineBigIntMethod(function writeBigUInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))\n})\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = 0\n  let mul = 1\n  let sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    const limit = Math.pow(2, (8 * byteLength) - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  let i = byteLength - 1\n  let mul = 1\n  let sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  this[offset] = (value >>> 8)\n  this[offset + 1] = (value & 0xff)\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  this[offset] = (value & 0xff)\n  this[offset + 1] = (value >>> 8)\n  this[offset + 2] = (value >>> 16)\n  this[offset + 3] = (value >>> 24)\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  this[offset] = (value >>> 24)\n  this[offset + 1] = (value >>> 16)\n  this[offset + 2] = (value >>> 8)\n  this[offset + 3] = (value & 0xff)\n  return offset + 4\n}\n\nBuffer.prototype.writeBigInt64LE = defineBigIntMethod(function writeBigInt64LE (value, offset = 0) {\n  return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nBuffer.prototype.writeBigInt64BE = defineBigIntMethod(function writeBigInt64BE (value, offset = 0) {\n  return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))\n})\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  value = +value\n  offset = offset >>> 0\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  const len = end - start\n\n  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {\n    // Use built-in when available, missing from IE11\n    this.copyWithin(targetStart, start, end)\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, end),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n    if (val.length === 1) {\n      const code = val.charCodeAt(0)\n      if ((encoding === 'utf8' && code < 128) ||\n          encoding === 'latin1') {\n        // Fast path: If `val` fits into a single byte, use that numeric value.\n        val = code\n      }\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  } else if (typeof val === 'boolean') {\n    val = Number(val)\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  let i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    const bytes = Buffer.isBuffer(val)\n      ? val\n      : Buffer.from(val, encoding)\n    const len = bytes.length\n    if (len === 0) {\n      throw new TypeError('The value \"' + val +\n        '\" is invalid for argument \"value\"')\n    }\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// CUSTOM ERRORS\n// =============\n\n// Simplified versions from Node, changed for Buffer-only usage\nconst errors = {}\nfunction E (sym, getMessage, Base) {\n  errors[sym] = class NodeError extends Base {\n    constructor () {\n      super()\n\n      Object.defineProperty(this, 'message', {\n        value: getMessage.apply(this, arguments),\n        writable: true,\n        configurable: true\n      })\n\n      // Add the error code to the name to include it in the stack trace.\n      this.name = `${this.name} [${sym}]`\n      // Access the stack to generate the error message including the error code\n      // from the name.\n      this.stack // eslint-disable-line no-unused-expressions\n      // Reset the name to the actual name.\n      delete this.name\n    }\n\n    get code () {\n      return sym\n    }\n\n    set code (value) {\n      Object.defineProperty(this, 'code', {\n        configurable: true,\n        enumerable: true,\n        value,\n        writable: true\n      })\n    }\n\n    toString () {\n      return `${this.name} [${sym}]: ${this.message}`\n    }\n  }\n}\n\nE('ERR_BUFFER_OUT_OF_BOUNDS',\n  function (name) {\n    if (name) {\n      return `${name} is outside of buffer bounds`\n    }\n\n    return 'Attempt to access memory outside buffer bounds'\n  }, RangeError)\nE('ERR_INVALID_ARG_TYPE',\n  function (name, actual) {\n    return `The \"${name}\" argument must be of type number. Received type ${typeof actual}`\n  }, TypeError)\nE('ERR_OUT_OF_RANGE',\n  function (str, range, input) {\n    let msg = `The value of \"${str}\" is out of range.`\n    let received = input\n    if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {\n      received = addNumericalSeparator(String(input))\n    } else if (typeof input === 'bigint') {\n      received = String(input)\n      if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {\n        received = addNumericalSeparator(received)\n      }\n      received += 'n'\n    }\n    msg += ` It must be ${range}. Received ${received}`\n    return msg\n  }, RangeError)\n\nfunction addNumericalSeparator (val) {\n  let res = ''\n  let i = val.length\n  const start = val[0] === '-' ? 1 : 0\n  for (; i >= start + 4; i -= 3) {\n    res = `_${val.slice(i - 3, i)}${res}`\n  }\n  return `${val.slice(0, i)}${res}`\n}\n\n// CHECK FUNCTIONS\n// ===============\n\nfunction checkBounds (buf, offset, byteLength) {\n  validateNumber(offset, 'offset')\n  if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {\n    boundsError(offset, buf.length - (byteLength + 1))\n  }\n}\n\nfunction checkIntBI (value, min, max, buf, offset, byteLength) {\n  if (value > max || value < min) {\n    const n = typeof min === 'bigint' ? 'n' : ''\n    let range\n    if (byteLength > 3) {\n      if (min === 0 || min === BigInt(0)) {\n        range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`\n      } else {\n        range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +\n                `${(byteLength + 1) * 8 - 1}${n}`\n      }\n    } else {\n      range = `>= ${min}${n} and <= ${max}${n}`\n    }\n    throw new errors.ERR_OUT_OF_RANGE('value', range, value)\n  }\n  checkBounds(buf, offset, byteLength)\n}\n\nfunction validateNumber (value, name) {\n  if (typeof value !== 'number') {\n    throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)\n  }\n}\n\nfunction boundsError (value, length, type) {\n  if (Math.floor(value) !== value) {\n    validateNumber(value, type)\n    throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)\n  }\n\n  if (length < 0) {\n    throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()\n  }\n\n  throw new errors.ERR_OUT_OF_RANGE(type || 'offset',\n                                    `>= ${type ? 1 : 0} and <= ${length}`,\n                                    value)\n}\n\n// HELPER FUNCTIONS\n// ================\n\nconst INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node takes equal signs as end of the Base64 encoding\n  str = str.split('=')[0]\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = str.trim().replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  let codePoint\n  const length = string.length\n  let leadSurrogate = null\n  const bytes = []\n\n  for (let i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  let c, hi, lo\n  const byteArray = []\n  for (let i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  let i\n  for (i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\n// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass\n// the `instanceof` check but they should be treated as of that type.\n// See: https://github.com/feross/buffer/issues/166\nfunction isInstance (obj, type) {\n  return obj instanceof type ||\n    (obj != null && obj.constructor != null && obj.constructor.name != null &&\n      obj.constructor.name === type.name)\n}\nfunction numberIsNaN (obj) {\n  // For IE11 support\n  return obj !== obj // eslint-disable-line no-self-compare\n}\n\n// Create lookup table for `toString('hex')`\n// See: https://github.com/feross/buffer/issues/219\nconst hexSliceLookupTable = (function () {\n  const alphabet = '0123456789abcdef'\n  const table = new Array(256)\n  for (let i = 0; i < 16; ++i) {\n    const i16 = i * 16\n    for (let j = 0; j < 16; ++j) {\n      table[i16 + j] = alphabet[i] + alphabet[j]\n    }\n  }\n  return table\n})()\n\n// Return not function with Error if BigInt not supported\nfunction defineBigIntMethod (fn) {\n  return typeof BigInt === 'undefined' ? BufferBigIntNotDefined : fn\n}\n\nfunction BufferBigIntNotDefined () {\n  throw new Error('BigInt not supported')\n}\n","import { Buffer } from 'buffer/index.js'\nexport { Buffer } // for iife reference MBP.Buffer\nconst encoder = new TextEncoder()\nconst decoder = new TextDecoder()\n\n\nexport const NB = numberBuffer\nexport function numberBuffer(type, initValue = 0) {\n  let buffer\n  if (type === undefined || typeof type !== 'string' || typeof initValue !== 'number') {\n    throw TypeError('invlaid init variablie type name. ')\n  }\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    buffer = Buffer.alloc(1)\n    if (type.includes('I')) buffer.writeInt8(initValue)\n    else buffer.writeUint8(initValue)\n  } else if (type.includes('16')) {\n    buffer = Buffer.alloc(2)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt16LE(initValue)\n      else buffer.writeInt16BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint16LE(initValue)\n      else buffer.writeUint16BE(initValue)\n    }\n  } else if (type.includes('32')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('I')) {\n      if (type.includes('L')) buffer.writeInt32LE(initValue)\n      else buffer.writeInt32BE(initValue)\n    } else {\n      if (type.includes('L')) buffer.writeUint32LE(initValue)\n      else buffer.writeUint32BE(initValue)\n    }\n  } else if (type.includes('F')) {\n    buffer = Buffer.alloc(4)\n    if (type.includes('L')) {\n      buffer.writeFloatLE(initValue)\n    } else {\n      buffer.writeFloatBE(initValue)\n    }\n  } else if (type.includes('N')) { // number as string\n    buffer = Buffer.from(String(initValue))\n  } else {\n    console.log(`invalid type: ${type} or initvalue: ${initValue}`)\n  }\n  return buffer\n}\n\n\nexport const MB = metaBuffer\nexport function metaBuffer(name, typeOrData, initValue) {\n  let buffer\n  let bufferType = 'B'\n  if (typeof typeOrData === 'number') {\n    if (typeof initValue === 'number') {  // initValue 0 should be passed.\n      buffer = Buffer.alloc(typeOrData)\n      if( initValue !== 0) buffer.fill(initValue)\n      bufferType = 'B'\n    } else {\n      buffer = Buffer.from(String(typeOrData))\n      bufferType = 'N'\n    }\n  } else if (typeof typeOrData === 'string' && typeof initValue === 'number') { // number with type.\n    bufferType = typeOrData.toUpperCase() // use explicit type name\n    buffer = numberBuffer(typeOrData, initValue) // notice.  two categories.  n: number string.  8, 16, 32: typed number.\n  } else if (typeof typeOrData === 'string' && initValue === undefined) { //  string buffer\n    buffer = Buffer.from(typeOrData)\n    bufferType = 'S'\n  } else if (typeOrData instanceof Uint8Array && initValue === undefined) { // buffer | Uint8Array\n    // Buffer.from:  Copies the passed buffer data onto a new Buffer instance.\n    // typecasting Uint8Array to Buffer.\n    buffer = (typeOrData instanceof Buffer) ? typeOrData : Buffer.from(typeOrData)\n  } else if (typeOrData instanceof ArrayBuffer && initValue === undefined) { // arrayBuffer\n    // Notice. typedArray is recommended instead of arrayBuffer\n    buffer = Buffer.from(typeOrData)\n  } else if (ArrayBuffer.isView(typeOrData)) { // typedarray buffer\n    buffer = Buffer.from(typeOrData.buffer, typeOrData.byteOffset, typeOrData.byteLength)\n  } else if (typeof typeOrData === 'object' && initValue === undefined) { //   object. like array. stringify\n    buffer = Buffer.from(JSON.stringify(typeOrData))\n    bufferType = 'O'\n  } else if (typeof typeOrData === 'boolean' && initValue === undefined) { //   object. like array. stringify\n    const v = typeOrData ? 1 : 0\n    buffer = Buffer.from([v])\n    bufferType = '!'\n  } else {\n    throw TypeError('invalid meta buffer type')\n  }\n\n  if (typeof name === 'string' && name.includes('#')) name = '' //\n\n  return [name, bufferType, buffer]\n}\n\nexport const MBA = metaBufferArguments\nexport function metaBufferArguments(...args) {\n  let i = 0\n  const mba = args.map(\n    data => {\n      const argsIndex = i++\n      // tip. MBA use index number as metabuffer's property name.\n      if (typeof data === 'number') {\n        // * JS's primitive Number stored as string.\n        return MB(argsIndex, 'N', data)\n      } else {\n        // typedarray, dataview, array, object, boolean\n        return MB(argsIndex, data)\n      }\n    })\n\n  return mba\n}\n\nexport function parseTypeName(type) {\n  type = type.toUpperCase()\n\n  if (type.includes('8')) {\n    if (type.includes('I')) {\n      return 'int8'\n    } else {\n      return 'uint8'\n    }\n  } else if (type.includes('16')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int16_le'\n      } else {\n        return 'int16_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint16_le'\n      } else {\n        return 'uint16_be'\n      }\n    }\n  } else if (type.includes('32')) {\n    if (type.includes('I')) {\n      if (type.includes('L')) {\n        return 'int32_le'\n      } else {\n        return 'int32_be'\n      }\n    } else {\n      if (type.includes('L')) {\n        return 'uint32_le'\n      } else {\n        return 'uint32_be'\n      }\n    }\n  } else if (type.includes('F')) {\n    if (type.includes('L')) {\n      return 'float_le'\n    } else {\n      return 'float_be'\n    }\n  } else if (type === 'B') {\n    return 'buffer'\n  } else if (type === 'S') { // string or arguments\n    return 'string'\n  } else if (type === 'N') { // number encoded as string\n    return 'number'\n  } else if (type === 'O') { // object encoded string\n    return 'object'\n  } else if (type === '!') { // boolean  1:true 0:false\n    return 'boolean'\n  } else {\n    throw TypeError('invalid data type')\n  }\n\n}\n\nexport function readTypedBuffer(simpleType, buffer, offset, length) {\n\n  const type = parseTypeName(simpleType)\n\n  if (type == 'int8') return buffer.readInt8(offset)\n  else if (type === 'uint8') return buffer.readUint8(offset)\n  else if (type === 'int16_le') return buffer.readInt16LE(offset)\n  else if (type === 'int16_be') return buffer.readInt16BE(offset)\n  else if (type === 'uint16_le') return buffer.readUint16LE(offset)\n  else if (type === 'uint16_be') return buffer.readUint16BE(offset)\n  else if (type === 'int32_le') return buffer.readInt32LE(offset)\n  else if (type === 'int32_be') return buffer.readInt32BE(offset)\n  else if (type === 'uint32_le') return buffer.readUint32LE(offset)\n  else if (type === 'uint32_be') return buffer.readUint32BE(offset)\n  else if (type === 'float_le') return buffer.readFloatLE(offset)\n  else if (type === 'float_be') return buffer.readFloatBE(offset)\n\n  else if (type === 'buffer') {\n    return buffer.subarray(offset, offset + length)\n  } else if (type === 'string') {\n    const strBuffer = buffer.subarray(offset, offset + length)\n    return decoder.decode(strBuffer)\n  } else if (type === 'number') {\n    const strNumber = buffer.subarray(offset, offset + length)\n    return Number(decoder.decode(strNumber))\n  } else if (type === 'object') {\n    const objEncoded = buffer.subarray(offset, offset + length)\n    try {\n      return JSON.parse(decoder.decode(objEncoded))\n    } catch (error) {\n      console.log('err. obj parse')\n    }\n  } else if (type === 'boolean') {\n    const v = buffer.readInt8(offset)\n    return v === 1\n  } else {\n    throw TypeError('invalid data')\n  }\n}\n\nfunction flatSubArray(args) {\n  let subArr = []\n  const mainArr = args.filter(item => {\n    if (Array.isArray(item[0])) subArr = subArr.concat(item)\n    else return item\n  })\n  return mainArr.concat(subArr)\n}\n\nexport function pack(...args) {\n  const bufArr = flatSubArray(args)\n  let size = 0\n  const info = []\n  let offset = 0\n\n  bufArr.forEach(bufPack => {\n    const [name, type, data] = bufPack\n    size += data.byteLength\n\n    if (typeof name === 'number' || name.length > 0) {\n    // MBA item use number type name.\n    // MB item use string type name.   null string means omit.\n    \n    // change to store more informative meta info.  \n    info.push([name, type, offset, data.byteLength]) \n    \n    }\n    offset = size\n  })\n\n\n  let infoEncoded\n  let infoSize\n\n  if (info.length > 0) {\n    let infoStr = JSON.stringify(info)\n    // console.log('pack infoStr , size:', infoStr , infoStr.length )\n    infoEncoded = encoder.encode(infoStr)\n    infoSize = infoEncoded.byteLength\n    size = size + infoSize + 2\n  }\n\n  const buffer = Buffer.alloc(size)\n  offset = 0\n  bufArr.forEach(bufPack => {\n    const buf = bufPack[2]\n    buffer.set(buf, offset)\n    offset += buf.byteLength\n  })\n\n  if (info.length > 0) {\n    buffer.set(infoEncoded, offset)\n    const infoSizeBuff = NB('16', infoSize)\n    buffer.set(infoSizeBuff, offset + infoSize)\n    return buffer\n  } else {\n    return buffer\n  }\n}\n\n\n/**\n * unpack() will use embeded meta info from the binary pack.  \n * You can specify (optional) meta obejct. \n * (It's useful to read pure buffer data.)\n * \n * You can get the meta object from:  getFrame(pack) , meta()\n * @param {Buffer|Uint8Array} binPack binaryData\n * @param {Object} meta *OPTION*  \n * @returns {Object|undefined} success: return Object (include buffer data).   fail: return undefined\n */\nexport function unpack(binPack, meta) {\n\n  const infoArr = meta || getMeta(binPack)\n  if (!infoArr) return\n\n  const buffer = Buffer.from(binPack)\n  const binObj = {}\n  let readCounter = 0\n  infoArr.forEach(bufPack => {\n    const [name, type, offset, length] = bufPack\n    binObj[name] = readTypedBuffer(type, buffer, offset, length)\n    // console.log( '###3 len',length )\n    if( length) readCounter += length\n  })\n\n  // Can not define meta for variable size buffer \n  // unpacker support automatic property to read left(did't read) buffers.\n  // console.log(\"######, unpack: buffer \" , readCounter, buffer ,buffer.byteLength)\n  if(  meta && buffer.byteLength !== readCounter ){\n    let leftSize = buffer.byteLength - readCounter\n    // console.log('total,left buffer size', buffer.byteLength, leftSize )\n    binObj[\"$OTHERS\"] = readTypedBuffer('b', buffer, readCounter, leftSize)\n  }\n\n  // set args with values if exist.\n  let mbaIndex = 0;\n  let args = [];\n  while( binObj[mbaIndex]){\n    args.push( binObj[mbaIndex++])\n  }\n  \n  if( args.length > 0 ) {\n    binObj.args = args \n    binObj.$ = binObj.args \n  }\n\n  return binObj\n\n}\n\n\n\nexport const U8 = parseUint8Array   //alias\n/**\n * \n * @param {any} data \n * @param {Boolean} shareArrayBuffer false(default):  return new( or copied) ArrayBuffer.    true: share the input data's arrayBuffer.\n * @returns {Uint8Array}\n */\nexport function parseUint8Array(data, shareArrayBuffer = false) {\n  if (data === undefined) throw TypeError('Invalid data type: Undefined')\n  if (typeof data === 'string') {\n    return encoder.encode(data)\n  } else if (typeof data === 'number') { // number -> 1 byte uint8array(number)\n    return Uint8Array.from([data])\n  } else if (data instanceof ArrayBuffer) { // arraybuffer -> wrap uint8array(ab)\n    if (shareArrayBuffer) {\n      return new Uint8Array(data)\n    } else {\n      const originData = new Uint8Array(data)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else if (ArrayBuffer.isView(data)) { // accept Buffer too.\n    if (shareArrayBuffer) {\n      return new Uint8Array(data.buffer, data.byteOffset, data.byteLength) // DataView, TypedArray >  uint8array( use offset, length )\n    } else {\n      // new memory to protect origin arraybuffer.\n      const originData = new Uint8Array(data.buffer, data.byteOffset, data.byteLength)\n      const dataCopy = new Uint8Array(data.byteLength)\n      dataCopy.set(originData)\n      return dataCopy\n    }\n  } else { // array, object\n    return encoder.encode(JSON.stringify(data)) // object(array.. )  > JSON.str > encode > unint8array\n  }\n}\n\nexport const B8 = parseBuffer\n\nexport function parseBuffer(data, shareArrayBuffer = false) {\n\n  const u8 = parseUint8Array(data, shareArrayBuffer)\n  if( shareArrayBuffer){\n    return Buffer.from( u8.buffer, u8.byteOffset, u8.byteLength )\n  }else{\n    return Buffer.from(u8)\n  }\n}\n\nexport const B8pack = parseBufferThenConcat\nexport function parseBufferThenConcat(...dataArray) {\n  const buffers = dataArray.map(data => parseBuffer(data))\n  return Buffer.concat( buffers)\n}\n\n\nexport const U8pack = parseUint8ThenConcat // alias\n/**\n * 1. parse list of data into U8 list\n * 2. return new Uint8Array merged.\n * @param  {...any} dataArray \n * @returns \n */\nexport function parseUint8ThenConcat(...dataArray) {\n  try {\n    let bufferSize = 0\n    let offset = 0\n    const buffers = dataArray.map(data => parseUint8Array(data))\n    buffers.forEach(buf => { bufferSize += buf.byteLength })\n    const buffer = new Uint8Array(bufferSize)\n    buffers.forEach(buf => {\n      buffer.set(buf, offset)\n      offset += buf.byteLength\n    })\n    return buffer\n  } catch (error) {\n    console.log(error)\n  }\n}\n\nexport function hex(buffer) {\n  return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('')\n}\n\nexport function equal(buf1, buf2) {\n  if (buf1.byteLength !== buf2.byteLength) return false\n  for (let i = 0; i < buf1.byteLength; i++) {\n    if (buf1[i] !== buf2[i]) return false\n  }\n  return true\n}\n\n\n\n\nexport function getBufferSize(binPack) {\n  if (getMetaSize(binPack) === 0) {\n    return binPack.byteLength\n  } else {\n    return binPack.byteLength - getMetaSize(binPack) - TAIL_LEN\n  }\n\n}\n\n// MB and MBA \nexport function parseMetaInfo(binPack, infoSize) {\n  let info;\n  try {\n    const buffer = new Uint8Array(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoFrom = buffer.byteLength - infoSize - 2\n    const infoEncoded = buffer.subarray(infoFrom, buffer.byteLength - 2)\n    const decoded = decoder.decode(infoEncoded)\n    const info = JSON.parse(decoded)\n\n    if (!Array.isArray(info) || !Array.isArray(info[0])) return\n\n    let firstItem = info[0]\n    if (!firstItem) return\n\n    if (firstItem.length < 3) return\n    const [name, type, offset] = firstItem\n\n    if ( typeof type !== 'string' || typeof offset !== 'number') return\n\n    return info\n  } catch (error) {\n    // return undefined\n  }\n}\n\n\n/** \n * Meta buffer pack Tail:\n * binary Pack include TAIL(two bytes size) info at the end if it has JSON info.\n * not include TAIL if it has not JSON.\n */\nexport const TAIL_LEN = 2\n\n/**\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @returns {Number} last two byte value( read Uint16 bigendian )\n */\nexport function readTail(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n    if (binPack.byteLength <= TAIL_LEN) return 0\n\n    const dv = new DataView(binPack.buffer, binPack.byteOffset, binPack.byteLength)\n    const infoSize = dv.getUint16(binPack.byteLength - TAIL_LEN)  // last 2 bytes for json-info-length.\n    return infoSize\n\n  } else {\n    // throw TypeError('invalid data type.')\n    return 0\n  }\n\n}\n\n\n// binay data pack is not always Buffer.  \n// It should accept Uint8Array binPack.\n// This function don't use Buffer method.\n\nexport function getMetaSize(binPack) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  if (binPack instanceof Uint8Array) {\n\n    const size = binPack.byteLength\n    if (size <= TAIL_LEN) return 0\n\n    //1. tail size check\n    const infoSize = readTail(binPack)\n    if (infoSize === 0 || infoSize > size) return 0\n    //2. try parse JSON \n    const success = parseMetaInfo(binPack, infoSize)\n    //3. return success: jsonInfoSize,  fail: 0\n    if (success) return infoSize\n    else return 0\n  }else{\n    return 0\n  }\n}\n\n\n/**\n * \n * @param {Buffer|Uint8Array} binPack \n * @returns {Buffer} \n */\nexport function getBuffer(binPack) {\n  const rawBufferSize = getBufferSize(binPack)\n  return binPack.subarray(0, rawBufferSize)\n}\n\n\n\n/**\n * extract Meta info object if it has.\n * \n * @param {Buffer|Uint8Array|ArrayBuffer} binPack \n * @param {Boolean} showDetail add additional item info: full data type name and bytelength.\n * @returns {Object|undefined} success: return MetaInfo Object.   fail: return undefined.(No valid JSON included.)\n */\nexport function getMeta(binPack, showDetail = false) {\n  if( binPack instanceof ArrayBuffer ){\n    binPack = Buffer.from(binPack) // creates a view for ArrayBuffer, without copying.\n  } \n  const infoSize = readTail(binPack)\n  if (infoSize === 0) return\n\n  // check valid Meta\n  let metaInfo = parseMetaInfo(binPack, infoSize)\n  if (!metaInfo) return\n\n  if (!showDetail) {\n    return metaInfo\n  } else {\n    // add additional info\n    metaInfo.forEach(bufPack => {\n      const len = bufPack[3]\n      if (len == undefined) {  // add size info.\n        if (bufPack[1].includes('8')) bufPack[3] = 1\n        else if (bufPack[1].includes('16')) bufPack[3] = 2\n        else if (bufPack[1].includes('32')) bufPack[3] = 4\n        else if (bufPack[1].includes('F')) bufPack[3] = 4\n        else if (bufPack[1].includes('!')) bufPack[3] = 1\n      }\n      bufPack[4] = parseTypeName(bufPack[1])  // add full-type-name.\n    })\n    return metaInfo\n  }\n}\n\nexport function rawPack( ...args){\n  return getBuffer( pack(...args) )\n}\n\nexport function meta( ...args){\n  return getMeta( pack(...args) )\n}\n\nexport function metaDetail( ...args){\n  return getMeta( pack(...args) , true)\n}\n\n\n\nexport function getMetaDetail(binPack) {\n  return getMeta(binPack, true)\n}\n","import { hash as sha256, hmac } from '../lib/fast-sha256.js'\nimport { MBP } from 'meta-buffer-pack'\n\nsha256.hash = function (data) {\n  return sha256(MBP.U8(data))\n}\n\nsha256.hex = function (data) {\n  return MBP.hex(sha256.hash(data))\n}\n\nsha256.hmac = function (key, data) {\n  return hmac(MBP.U8(key), MBP.U8(data))\n}\n\nexport { sha256 }\n","import{ MBP, Buffer} from \"meta-buffer-pack\"\nconst MB = MBP.MB\n\n\n// remocon message pack one byte header. \nexport let BohoMsg = {\n  AUTH_REQ : 0xB0,  \n  AUTH_NONCE: 0xB1,\n  AUTH_HMAC: 0xB2,\n  AUTH_ACK: 0xB3,\n  AUTH_FAIL: 0xB4,\n  AUTH_EXT: 0xB5,\n  ENC_PACK : 0xB6,  \n  ENC_E2E : 0xB7,  \n  ENC_488 : 0xB8\n}\n\nfor (let c in BohoMsg) { BohoMsg[BohoMsg[c]] = c }\n\nexport const Meta = {\n\n  AUTH_REQ: MBP.meta(  // 2\n    MB('header','8', 0),\n    MB('reserved','8', 0)\n  ),\n\n  AUTH_NONCE: MBP.meta(  // 13\n    MB('header','8', 0),\n    MB('unixTime','32L', 0),\n    MB('milTime','32L', 0 ),\n    MB('nonce', Buffer.alloc(4))\n  ),\n\n  AUTH_HMAC: MBP.meta( // 45\n    MB('header','8', 0),\n    MB('id8',Buffer.alloc(8)),\n    MB('nonce', Buffer.alloc(4)),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n  AUTH_ACK: MBP.meta( // 33\n    MB('header','8', 0),\n    MB('hmac32', Buffer.alloc(32))\n  ),\n    \n\n  ENC_PACK: MBP.meta(  //25 + payload\n    MB('type','8',0),\n    MB('len','32L',0),  // pure xdata size.  \n    MB('salt12', Buffer.alloc(12)),  // sec,mil,rand\n    MB('hmac',8,0)\n    // MB( 'xdata', encData )\n    ),\n\n\n  ENC_488: MBP.meta(   // 21 + payload\n    MB('type','8', 0 ),\n    MB('len','32L', 0 ),\n    MB('otpSrc8', Buffer.alloc(8) ),\n    MB('hmac8', Buffer.alloc(8) )\n    // MB('xdata', encData ) \n    )\n\n\n  }\n\n\n  function getMetaSize(meta){\n    let lastItem = meta[ meta.length - 1]\n    return lastItem[2] + lastItem[3]\n  }\n\n  export const MetaSize = {\n    AUTH_REQ: getMetaSize( Meta.AUTH_REQ ),\n    AUTH_NONCE: getMetaSize( Meta.AUTH_NONCE ),\n    AUTH_HMAC: getMetaSize( Meta.AUTH_HMAC ),\n    AUTH_ACK: getMetaSize( Meta.AUTH_ACK ),\n    ENC_PACK: getMetaSize( Meta.ENC_PACK ),\n    ENC_488: getMetaSize( Meta.ENC_488 )\n  }\n\n// console.log( 'boho MetaSize', MetaSize )\n// boho MetaSize {\n//   AUTH_REQ: 2,\n//   AUTH_NONCE: 13,\n//   AUTH_HMAC: 45,\n//   AUTH_ACK: 33,\n//   ENC_PACK: 25,\n//   ENC_488: 21\n// }","import { sha256 } from './sha256-mbp.js'\nimport { MBP, Buffer } from 'meta-buffer-pack'\nexport { sha256, MBP, Buffer }\n\nimport { webcrypto } from 'crypto'\nimport { BohoMsg, Meta, MetaSize } from \"./constants.js\"\nexport { BohoMsg, Meta, MetaSize }\n\nlet isNode = false\ntry {\n  isNode = Object.prototype.toString.call(global.process) === '[object process]'\n} catch (e) { }\n\n\nexport function RAND(size) {\n  if( isNode ){\n    return webcrypto.getRandomValues(Buffer.alloc(size))\n  }else{\n    return self.crypto.getRandomValues(Buffer.alloc(size))\n  }\n}\n\n\n\nexport class Boho {\n  // A. Core\n  constructor() {\n\n    this._id8 = Buffer.alloc(8)\n    this._otpSrc44 = Buffer.alloc(44)\n    this._otp36 = Buffer.alloc(36)\n    this._hmac = Buffer.alloc(32)\n\n    this.auth_salt12 = Buffer.alloc(12)\n    this.localNonce = Buffer.alloc(4)\n    this.remoteNonce = Buffer.alloc(4)\n    this.isAuthorized = false\n\n  }\n\n  clearAuth(){\n    this._id8.fill(0)\n    this._otpSrc44.fill(0)\n    this._otp36.fill(0)\n    this._hmac.fill(0)\n    this.auth_salt12.fill(0)\n    this.localNonce.fill(0)\n    this.remoteNonce.fill(0)\n    this.isAuthorized = false\n  }\n\n  // for the self\n  set_id8(data) {\n    let encStr = MBP.B8(data)\n    this._id8.fill(0)\n    encStr.copy(this._id8, 0, 0, 8)\n  }\n\n  set_hash_id8(data) {\n    let idSum = MBP.B8(sha256.hash(data))\n    idSum.copy(this._id8, 0, 0, 8)\n  }\n\n\n  set_key(data) {\n    let keySum = MBP.B8(sha256.hash(data))\n    keySum.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n  // for the remote client.\n  copy_id8(data) {\n    data.copy(this._id8, 0, 0, 8)\n  }\n\n  // for the remote client.\n  copy_key(data) {\n    data.copy(this._otpSrc44, 0, 0, 32)\n  }\n\n\n  sha256_n(srcData, n) {\n    let hashSum = sha256.hash(srcData)\n    for (let i = 0; i < n; i++) hashSum = sha256.hash(hashSum)\n    return hashSum\n  }\n\n\n  // useful general encryption  i.e. enc_pack\n  set_clock_rand() {\n\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      RAND(4)\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  // for secure communication sender. \n  set_clock_nonce(nonce) {\n    let milTime = Date.now()\n    let secTime = parseInt(milTime / 1000)\n    milTime = milTime % 0xffffffff\n    const salt12 = Buffer.concat([\n     MBP.NB('32L', secTime),\n     MBP.NB('32L', milTime),\n      nonce\n    ])\n\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n\n  set_salt12(salt12) {\n    salt12.copy(this._otpSrc44, 32)\n  }\n\n  resetOTP() {\n    let otp32 = MBP.B8(sha256.hash(this._otpSrc44))\n    otp32.copy(this._otp36, 0, 0, 32)\n  }\n\n  getIndexOTP(otpIndex) {\n    this._otp36.writeUInt32LE(otpIndex, 32)\n    return sha256.hash(this._otp36)\n  }\n\n\n  generateHMAC(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n  }\n\n  // return 8 bytes of hash\n  getHMAC8(data) {\n    let hmacSrc = Buffer.concat([this._otpSrc44, data])\n    this._hmac = MBP.B8(sha256.hash(hmacSrc))\n    return this._hmac.subarray(0, 8)\n  }\n\n  xotp(data, otpStartIndex = 0, shareDataBuffer = false) {\n\n    data = MBP.B8(data, shareDataBuffer)\n\n    let len = data.byteLength\n    let otpIndex = otpStartIndex\n    let dataOffset = 0\n    let xorCalcLen = 0\n\n    while (len > 0) {\n      xorCalcLen = len < 32 ? len : 32\n      let iotp = this.getIndexOTP(++otpIndex);\n      for (let i = 0; i < xorCalcLen; i++) {\n        data[dataOffset++] ^= iotp[i]\n      }\n      len -= 32\n    }\n    return data\n  }\n\n  // B. AUTH process\n\n  // step 1\n  // client send AUTH_REQ\n  auth_req() {\n    return MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.AUTH_REQ),\n      MBP.MB('#reserved', '8', 0)\n    )\n  }\n\n  // step 2\n  // server send AUTH_NONCE\n  auth_nonce() {\n    let now = Date.now()\n    let unixTime = Math.floor(now / 1000)\n    let milTime = now % 1000\n    this.localNonce = RAND(4)\n    this.auth_salt12 = Buffer.concat([\n     MBP.NB('32L', unixTime),\n     MBP.NB('32L', milTime),\n      this.localNonce\n    ])\n\n    let infoPack = Buffer.concat([\n     MBP.NB('8', BohoMsg.AUTH_NONCE),\n      this.auth_salt12\n    ])\n    return infoPack\n  }\n\n\n  // step 3\n  // client send AUTH_HMAC\n  // input :  auth_nonce buffer\n  auth_hmac(buffer) {\n    let auth_nonce = MBP.unpack(buffer, Meta.AUTH_NONCE)\n    if (auth_nonce) {\n      // console.log(' auth nonce', auth_nonce )\n\n      // let now = Date.now()\n      // let localUTC= Math.floor( now/ 1000 )\n      // let localMilTime = now % 1000\n\n      // console.log('time server [sec]', auth_nonce.unixTime, auth_nonce.milTime )\n      // console.log('time client [sec]', localUTC , localMilTime )\n      // console.log('time diff client and server[sec]', auth_nonce.unixTime - localUTC )\n\n      // let serverSecMil = auth_nonce.unixTime * 1000 + auth_nonce.milTime\n      // console.log('time diff msec client and server[msec]', serverSecMil - now )\n\n      let salt12 = Buffer.concat([\n       MBP.NB('32L', auth_nonce.unixTime),\n       MBP.NB('32L', auth_nonce.milTime),\n        auth_nonce.nonce\n      ])\n\n      this.set_salt12(salt12)\n\n      this.localNonce = RAND(4)\n      // hmac( key, sec,mil,serverNonce, localNonce)\n      this.generateHMAC(this.localNonce)\n\n      // let hmac8 = this._hmac.subarray(0, 8)\n\n      this.remoteNonce = auth_nonce.nonce\n\n      let auth_hmac_buffer = MBP.pack( // 21 -> 45\n       MBP.MB('#header', '8', BohoMsg.AUTH_HMAC),\n       MBP.MB('#id8', this._id8),\n       MBP.MB('#nonce', this.localNonce),\n       MBP.MB('#hmac32', this._hmac ), //full 32bytes hash\n      )\n\n      return auth_hmac_buffer\n    }\n    return false\n  }\n\n  /*  \n      step 4.  for server\n  \n      step 4-1. check client's auth_hmac\n      step 4-2. reply result\n          send AUTH_ACK  with another HMAC for client.\n          or send AUTH_FAIL when fail.\n   */\n\n  // input: unpack object or buffer of auth_hmac\n  check_auth_hmac(data) {\n    let infoPack\n    if (data instanceof Uint8Array) {\n      infoPack = MBP.unpack(data, Meta.AUTH_HMAC)\n      if (!infoPack) {\n        // console.log('auth_hamc unpack fail.')\n        return\n      }\n    } else {\n      infoPack = data;\n\n    }\n    // console.log('auth_hamc infoObj', infoPack )\n\n    this.set_salt12(this.auth_salt12)\n\n    // hmac( key, sec,mil,serverNonce, clientNonce)\n    this.generateHMAC(infoPack.nonce)\n    // let hmac8 = this._hmac.subarray(0, 8)\n    let hmac32 = this._hmac\n\n    if (MBP.equal(infoPack.hmac32, hmac32)) {\n      //Auth success then store client nonce.\n      this.remoteNonce = infoPack.nonce\n\n      let salt12 = Buffer.concat([\n        this.localNonce,\n        this.remoteNonce,\n        this.localNonce\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(infoPack.nonce)\n      let replyHMAC = this._hmac\n\n      let auth_ack = MBP.rawPack( \n       MBP.MB('header', '8', BohoMsg.AUTH_ACK),\n       MBP.MB('hmac32', replyHMAC)\n      )\n      this.isAuthorized = true\n      return auth_ack\n    }\n    return false\n  }\n\n\n\n  // step 5.  cross check\n  // client check server's hmac.  \n  check_auth_ack_hmac(buffer) {\n    // server response has hmac ( key + clientNonce)\n    let auth_ack = MBP.unpack(buffer, Meta.AUTH_ACK)\n    if (auth_ack) {\n      let salt12 = Buffer.concat([\n        this.remoteNonce,\n        this.localNonce,\n        this.remoteNonce,\n      ])\n      this.set_salt12(salt12)\n      this.generateHMAC(this.localNonce)\n      // let hmac8 = this._hmac.subarray(0, 8)\n      let hmac32 = this._hmac\n      //server side hmac using client nonce.\n      if (MBP.equal(hmac32, auth_ack.hmac32)) {\n        this.isAuthorized = true\n        return true\n      }\n    }\n    // server hmac error\n    return\n  }\n\n  // C. Secure Communication\n\n  // Must AUTH first.\n  encrypt_488(data) {  // payload max about 2^32 bytes.\n    if (!this.isAuthorized) return\n\n    data = MBP.B8(data)\n\n    this.set_clock_nonce(this.remoteNonce)\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_488),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#otpSrc8', this._otpSrc44.subarray(32, 40)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    // console.log('enc pack result', pack )\n    return pack\n  }\n\n\n  decrypt_488(data) {\n    data = MBP.B8(data)\n\n    let pack = MBP.unpack(data, Meta.ENC_488)\n\n    if (pack) {\n\n      let salt12 = Buffer.concat([\n        pack.otpSrc8,\n        this.localNonce\n      ])\n\n      this.set_salt12(salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS.subarray(0, pack.len)\n      let decData = this.xotp(xdata)\n\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(hmac8, pack.hmac8)) return decData\n\n      // console.log('hmac dismatch', decData )\n    } else {\n      // console.log('unpack fail')\n    }\n  }\n\n\n  // maxium data size is 2**32 -1 bytes.\n  encryptPack(data) {\n    data = MBP.B8(data)\n\n    this.set_clock_rand()\n    this.resetOTP()\n\n    let hmac8 = this.getHMAC8(data)\n    let encData = this.xotp(data)\n\n    let pack = MBP.pack(\n      MBP.MB('#type', '8', BohoMsg.ENC_PACK),\n      MBP.MB('#len', '32L', data.byteLength),\n      MBP.MB('#salt12', this._otpSrc44.subarray(32)),\n      MBP.MB('#hmac8', hmac8),\n      MBP.MB('#xdata', encData)\n    )\n    return pack\n  }\n\n\n  decryptPack(data) {\n\n    if (data[0] !== BohoMsg.ENC_PACK) {\n      // console.log('Boho: Invalid packType')\n      return\n    }\n\n    // packLength\n    let readPackLen = data.readUint32LE(1);\n    if (readPackLen != data.byteLength - MetaSize.ENC_PACK) {\n      // console.log('Boho: Invalid LEN data_len: data.byteLen' , readPackLen, data.byteLength)\n      return\n    }\n\n    try {\n      let pack = MBP.unpack(data, Meta.ENC_PACK)\n      //  console.log('unpack result', pack )\n      if (!pack) return\n\n      this.set_salt12(pack.salt12)\n      this.resetOTP()\n\n      let xdata = pack.$OTHERS\n      let decData = this.xotp(xdata)\n      let hmac8 = this.getHMAC8(decData)\n\n      if (MBP.equal(pack.hmac, hmac8)) {\n        pack.data = decData\n        return pack\n      }\n      // console.log('Invalid HMAC', pack.hmac, hmac8 )\n\n    } catch (error) {\n      // console.log('Boho: unpack err', error )\n\n    }\n  }\n\n  encrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let pack = this.encryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return pack;\n  }\n\n  decrypt_e2e(data, key) {\n    let baseKey = Buffer.alloc(32)\n    baseKey.set(this._otpSrc44.subarray(0, 32))\n    this.set_key(key)\n    let decPack = this.decryptPack(data)\n    this._otpSrc44.set(baseKey)\n    return decPack\n  }\n\n}\n","import { Boho, RAND, MBP, BohoMsg, Meta, MetaSize , sha256, Buffer } from './boho.js'\n\nBoho.RAND = RAND;\nBoho.BohoMsg = BohoMsg;\nBoho.Meta = Meta;\nBoho.MetaSize = MetaSize;\nBoho.sha256 = sha256;\nBoho.MBP = MBP;\nBoho.Buffer = Buffer;\n\nexport default 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\ No newline at end of file
diff --git a/dist/boho.mjs b/dist/boho.mjs
index 921436a..bfe2be4 100644
--- a/dist/boho.mjs
+++ b/dist/boho.mjs
@@ -1,2 +1,2 @@
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i(t).update(e),n=r.digest();return r.clean(),n}(H(t),H(e))};const et=T;let rt={AUTH_REQ:176,AUTH_NONCE:177,AUTH_HMAC:178,AUTH_ACK:179,AUTH_FAIL:180,AUTH_EXT:181,ENC_PACK:182,ENC_E2E:183,ENC_488:184};for(let t in rt)rt[rt[t]]=t;const nt={AUTH_REQ:Z(et("header","8",0),et("reserved","8",0)),AUTH_NONCE:Z(et("header","8",0),et("unixTime","32L",0),et("milTime","32L",0),et("nonce",A.Buffer.alloc(4))),AUTH_HMAC:Z(et("header","8",0),et("id8",A.Buffer.alloc(8)),et("nonce",A.Buffer.alloc(4)),et("hmac32",A.Buffer.alloc(32))),AUTH_ACK:Z(et("header","8",0),et("hmac32",A.Buffer.alloc(32))),ENC_PACK:Z(et("type","8",0),et("len","32L",0),et("salt12",A.Buffer.alloc(12)),et("hmac",8,0)),ENC_488:Z(et("type","8",0),et("len","32L",0),et("otpSrc8",A.Buffer.alloc(8)),et("hmac8",A.Buffer.alloc(8)))};function it(t){let e=t[t.length-1];return e[2]+e[3]}const ot={AUTH_REQ:it(nt.AUTH_REQ),AUTH_NONCE:it(nt.AUTH_NONCE),AUTH_HMAC:it(nt.AUTH_HMAC),AUTH_ACK:it(nt.AUTH_ACK),ENC_PACK:it(nt.ENC_PACK),ENC_488:it(nt.ENC_488)};let ft=!1;try{ft="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function st(e){return ft?t.getRandomValues(A.Buffer.alloc(e)):self.crypto.getRandomValues(A.Buffer.alloc(e))}class ut{constructor(){this._id8=A.Buffer.alloc(8),this._otpSrc44=A.Buffer.alloc(44),this._otp36=A.Buffer.alloc(36),this._hmac=A.Buffer.alloc(32),this.auth_salt12=A.Buffer.alloc(12),this.localNonce=A.Buffer.alloc(4),this.remoteNonce=A.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=k(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){k(o.hash(t)).copy(this._id8,0,0,8)}set_key(t){k(o.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=o.hash(t);for(let t=0;t<e;t++)r=o.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;A.Buffer.concat([L("32L",e),L("32L",t),st(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;A.Buffer.concat([L("32L",r),L("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){k(o.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),o.hash(this._otp36)}generateHMAC(t){let e=A.Buffer.concat([this._otpSrc44,t]);this._hmac=k(o.hash(e))}getHMAC8(t){let e=A.Buffer.concat([this._otpSrc44,t]);return this._hmac=k(o.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let n=(t=k(t,r)).byteLength,i=e,o=0,f=0;for(;n>0;){f=n<32?n:32;let e=this.getIndexOTP(++i);for(let r=0;r<f;r++)t[o++]^=e[r];n-=32}return t}auth_req(){return R(T("#type","8",rt.AUTH_REQ),T("#reserved","8",0))}auth_nonce(){let t=Date.now(),e=Math.floor(t/1e3),r=t%1e3;return this.localNonce=st(4),this.auth_salt12=A.Buffer.concat([L("32L",e),L("32L",r),this.localNonce]),A.Buffer.concat([L("8",rt.AUTH_NONCE),this.auth_salt12])}auth_hmac(t){let e=M(t,nt.AUTH_NONCE);if(e){let t=A.Buffer.concat([L("32L",e.unixTime),L("32L",e.milTime),e.nonce]);return this.set_salt12(t),this.localNonce=st(4),this.generateHMAC(this.localNonce),this.remoteNonce=e.nonce,R(T("#header","8",rt.AUTH_HMAC),T("#id8",this._id8),T("#nonce",this.localNonce),T("#hmac32",this._hmac))}return!1}check_auth_hmac(t){let e;if(t instanceof Uint8Array){if(e=M(t,nt.AUTH_HMAC),!e)return}else e=t;this.set_salt12(this.auth_salt12),this.generateHMAC(e.nonce);let r=this._hmac;if(K(e.hmac32,r)){this.remoteNonce=e.nonce;let t=A.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=W(T("header","8",rt.AUTH_ACK),T("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=M(t,nt.AUTH_ACK);if(e){let t=A.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),K(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=k(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_488),T("#len","32L",t.byteLength),T("#otpSrc8",this._otpSrc44.subarray(32,40)),T("#hmac8",e),T("#xdata",r))}decrypt_488(t){let e=M(t=k(t),nt.ENC_488);if(e){let t=A.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(K(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=k(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return R(T("#type","8",rt.ENC_PACK),T("#len","32L",t.byteLength),T("#salt12",this._otpSrc44.subarray(32)),T("#hmac8",e),T("#xdata",r))}decryptPack(t){if(t[0]!==rt.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-ot.ENC_PACK)try{let e=M(t,nt.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(K(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=A.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=A.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}}var ht=A.Buffer;export{ut as Boho,rt as BohoMsg,ht as Buffer,tt as MBP,nt as Meta,ot as MetaSize,st as RAND,o as sha256};
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f,s,u,h,a,c,l,p,y,g,d,b,w;for(;o>=64;){for(f=e[0],s=e[1],u=e[2],h=e[3],a=e[4],c=e[5],l=e[6],p=e[7],g=0;g<16;g++)d=i+4*g,t[g]=(255&r[d])<<24|(255&r[d+1])<<16|(255&r[d+2])<<8|255&r[d+3];for(g=16;g<64;g++)y=t[g-2],b=(y>>>17|y<<15)^(y>>>19|y<<13)^y>>>10,y=t[g-15],w=(y>>>7|y<<25)^(y>>>18|y<<14)^y>>>3,t[g]=(b+t[g-7]|0)+(w+t[g-16]|0);for(g=0;g<64;g++)b=(((a>>>6|a<<26)^(a>>>11|a<<21)^(a>>>25|a<<7))+(a&c^~a&l)|0)+(p+(n[g]+t[g]|0)|0)|0,w=((f>>>2|f<<30)^(f>>>13|f<<19)^(f>>>22|f<<10))+(f&s^f&u^s&u)|0,p=l,l=c,c=a,a=h+b|0,h=u,u=s,s=f,f=b+w|0;e[0]+=f,e[1]+=s,e[2]+=u,e[3]+=h,e[4]+=a,e[5]+=c,e[6]+=l,e[7]+=p,i+=64,o-=64}return i}const o=function(){function t(){this.digestLength=e,this.blockSize=r,this.state=new Int32Array(8),this.temp=new Int32Array(64),this.buffer=new Uint8Array(128),this.bufferLength=0,this.bytesHashed=0,this.finished=!1,this.reset()}return t.prototype.reset=function(){return this.state[0]=1779033703,this.state[1]=3144134277,this.state[2]=1013904242,this.state[3]=2773480762,this.state[4]=1359893119,this.state[5]=2600822924,this.state[6]=528734635,this.state[7]=1541459225,this.bufferLength=0,this.bytesHashed=0,this.finished=!1,this},t.prototype.clean=function(){for(var t=0;t<this.buffer.length;t++)this.buffer[t]=0;for(t=0;t<this.temp.length;t++)this.temp[t]=0;this.reset()},t.prototype.update=function(t,e){if(void 0===e&&(e=t.length),this.finished)throw new Error("SHA256: can't update because hash was finished.");let r=0;if(this.bytesHashed+=e,this.bufferLength>0){for(;this.bufferLength<64&&e>0;)this.buffer[this.bufferLength++]=t[r++],e--;64===this.bufferLength&&(i(this.temp,this.state,this.buffer,0,64),this.bufferLength=0)}for(e>=64&&(r=i(this.temp,this.state,t,r,e),e%=64);e>0;)this.buffer[this.bufferLength++]=t[r++],e--;return this},t.prototype.finish=function(t){if(!this.finished){const t=this.bytesHashed,r=this.bufferLength,n=t/536870912|0,o=t<<3,f=t%64<56?64:128;this.buffer[r]=128;for(var e=r+1;e<f-8;e++)this.buffer[e]=0;this.buffer[f-8]=n>>>24&255,this.buffer[f-7]=n>>>16&255,this.buffer[f-6]=n>>>8&255,this.buffer[f-5]=n>>>0&255,this.buffer[f-4]=o>>>24&255,this.buffer[f-3]=o>>>16&255,this.buffer[f-2]=o>>>8&255,this.buffer[f-1]=o>>>0&255,i(this.temp,this.state,this.buffer,0,f),this.finished=!0}for(e=0;e<8;e++)t[4*e+0]=this.state[e]>>>24&255,t[4*e+1]=this.state[e]>>>16&255,t[4*e+2]=this.state[e]>>>8&255,t[4*e+3]=this.state[e]>>>0&255;return this},t.prototype.digest=function(){const t=new Uint8Array(this.digestLength);return this.finish(t),t},t.prototype._saveState=function(t){for(let e=0;e<this.state.length;e++)t[e]=this.state[e]},t.prototype._restoreState=function(t,e){for(let e=0;e<this.state.length;e++)this.state[e]=t[e];this.bytesHashed=e,this.finished=!1,this.bufferLength=0},t}(),f=function(){function t(t){this.inner=new o,this.outer=new o,this.blockSize=this.inner.blockSize,this.digestLength=this.inner.digestLength;const e=new Uint8Array(this.blockSize);if(t.length>this.blockSize)(new o).update(t).finish(e).clean();else for(var r=0;r<t.length;r++)e[r]=t[r];for(r=0;r<e.length;r++)e[r]^=54;this.inner.update(e);for(r=0;r<e.length;r++)e[r]^=106;this.outer.update(e),this.istate=new Uint32Array(8),this.ostate=new Uint32Array(8),this.inner._saveState(this.istate),this.outer._saveState(this.ostate);for(r=0;r<e.length;r++)e[r]=0}return t.prototype.reset=function(){return this.inner._restoreState(this.istate,this.inner.blockSize),this.outer._restoreState(this.ostate,this.outer.blockSize),this},t.prototype.clean=function(){for(let t=0;t<this.istate.length;t++)this.ostate[t]=this.istate[t]=0;this.inner.clean(),this.outer.clean()},t.prototype.update=function(t){return this.inner.update(t),this},t.prototype.finish=function(t){return 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f(t).update(e),n=r.digest();return r.clean(),n}(x(t),x(e))};const rt=v;let nt={AUTH_REQ:176,AUTH_NONCE:177,AUTH_HMAC:178,AUTH_ACK:179,AUTH_FAIL:180,AUTH_EXT:181,ENC_PACK:182,ENC_E2E:183,ENC_488:184};for(let t in nt)nt[nt[t]]=t;const it={AUTH_REQ:tt(rt("header","8",0),rt("reserved","8",0)),AUTH_NONCE:tt(rt("header","8",0),rt("unixTime","32L",0),rt("milTime","32L",0),rt("nonce",_.Buffer.alloc(4))),AUTH_HMAC:tt(rt("header","8",0),rt("id8",_.Buffer.alloc(8)),rt("nonce",_.Buffer.alloc(4)),rt("hmac32",_.Buffer.alloc(32))),AUTH_ACK:tt(rt("header","8",0),rt("hmac32",_.Buffer.alloc(32))),ENC_PACK:tt(rt("type","8",0),rt("len","32L",0),rt("salt12",_.Buffer.alloc(12)),rt("hmac",8,0)),ENC_488:tt(rt("type","8",0),rt("len","32L",0),rt("otpSrc8",_.Buffer.alloc(8)),rt("hmac8",_.Buffer.alloc(8)))};function ot(t){let e=t[t.length-1];return e[2]+e[3]}const ft={AUTH_REQ:ot(it.AUTH_REQ),AUTH_NONCE:ot(it.AUTH_NONCE),AUTH_HMAC:ot(it.AUTH_HMAC),AUTH_ACK:ot(it.AUTH_ACK),ENC_PACK:ot(it.ENC_PACK),ENC_488:ot(it.ENC_488)};let st=!1;try{st="[object process]"===Object.prototype.toString.call(global.process)}catch(t){}function ut(e){return st?t.getRandomValues(_.Buffer.alloc(e)):self.crypto.getRandomValues(_.Buffer.alloc(e))}class ht{constructor(){this._id8=_.Buffer.alloc(8),this._otpSrc44=_.Buffer.alloc(44),this._otp36=_.Buffer.alloc(36),this._hmac=_.Buffer.alloc(32),this.auth_salt12=_.Buffer.alloc(12),this.localNonce=_.Buffer.alloc(4),this.remoteNonce=_.Buffer.alloc(4),this.isAuthorized=!1}clearAuth(){this._id8.fill(0),this._otpSrc44.fill(0),this._otp36.fill(0),this._hmac.fill(0),this.auth_salt12.fill(0),this.localNonce.fill(0),this.remoteNonce.fill(0),this.isAuthorized=!1}set_id8(t){let e=P(t);this._id8.fill(0),e.copy(this._id8,0,0,8)}set_hash_id8(t){P(s.hash(t)).copy(this._id8,0,0,8)}set_key(t){P(s.hash(t)).copy(this._otpSrc44,0,0,32)}copy_id8(t){t.copy(this._id8,0,0,8)}copy_key(t){t.copy(this._otpSrc44,0,0,32)}sha256_n(t,e){let r=s.hash(t);for(let t=0;t<e;t++)r=s.hash(r);return r}set_clock_rand(){let t=Date.now(),e=parseInt(t/1e3);t%=4294967295;_.Buffer.concat([I("32L",e),I("32L",t),ut(4)]).copy(this._otpSrc44,32)}set_clock_nonce(t){let e=Date.now(),r=parseInt(e/1e3);e%=4294967295;_.Buffer.concat([I("32L",r),I("32L",e),t]).copy(this._otpSrc44,32)}set_salt12(t){t.copy(this._otpSrc44,32)}resetOTP(){P(s.hash(this._otpSrc44)).copy(this._otp36,0,0,32)}getIndexOTP(t){return this._otp36.writeUInt32LE(t,32),s.hash(this._otp36)}generateHMAC(t){let e=_.Buffer.concat([this._otpSrc44,t]);this._hmac=P(s.hash(e))}getHMAC8(t){let e=_.Buffer.concat([this._otpSrc44,t]);return this._hmac=P(s.hash(e)),this._hmac.subarray(0,8)}xotp(t,e=0,r=!1){let n=(t=P(t,r)).byteLength,i=e,o=0,f=0;for(;n>0;){f=n<32?n:32;let e=this.getIndexOTP(++i);for(let r=0;r<f;r++)t[o++]^=e[r];n-=32}return t}auth_req(){return M(v("#type","8",nt.AUTH_REQ),v("#reserved","8",0))}auth_nonce(){let t=Date.now(),e=Math.floor(t/1e3),r=t%1e3;return this.localNonce=ut(4),this.auth_salt12=_.Buffer.concat([I("32L",e),I("32L",r),this.localNonce]),_.Buffer.concat([I("8",nt.AUTH_NONCE),this.auth_salt12])}auth_hmac(t){let e=H(t,it.AUTH_NONCE);if(e){let t=_.Buffer.concat([I("32L",e.unixTime),I("32L",e.milTime),e.nonce]);return this.set_salt12(t),this.localNonce=ut(4),this.generateHMAC(this.localNonce),this.remoteNonce=e.nonce,M(v("#header","8",nt.AUTH_HMAC),v("#id8",this._id8),v("#nonce",this.localNonce),v("#hmac32",this._hmac))}return!1}check_auth_hmac(t){let e;if(t instanceof Uint8Array){if(e=H(t,it.AUTH_HMAC),!e)return}else e=t;this.set_salt12(this.auth_salt12),this.generateHMAC(e.nonce);let r=this._hmac;if(V(e.hmac32,r)){this.remoteNonce=e.nonce;let t=_.Buffer.concat([this.localNonce,this.remoteNonce,this.localNonce]);this.set_salt12(t),this.generateHMAC(e.nonce);let r=this._hmac,n=Z(v("header","8",nt.AUTH_ACK),v("hmac32",r));return this.isAuthorized=!0,n}return!1}check_auth_ack_hmac(t){let e=H(t,it.AUTH_ACK);if(e){let t=_.Buffer.concat([this.remoteNonce,this.localNonce,this.remoteNonce]);if(this.set_salt12(t),this.generateHMAC(this.localNonce),V(this._hmac,e.hmac32))return this.isAuthorized=!0,!0}}encrypt_488(t){if(!this.isAuthorized)return;t=P(t),this.set_clock_nonce(this.remoteNonce),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return M(v("#type","8",nt.ENC_488),v("#len","32L",t.byteLength),v("#otpSrc8",this._otpSrc44.subarray(32,40)),v("#hmac8",e),v("#xdata",r))}decrypt_488(t){let e=H(t=P(t),it.ENC_488);if(e){let t=_.Buffer.concat([e.otpSrc8,this.localNonce]);this.set_salt12(t),this.resetOTP();let r=e.$OTHERS.subarray(0,e.len),n=this.xotp(r);if(V(this.getHMAC8(n),e.hmac8))return n}}encryptPack(t){t=P(t),this.set_clock_rand(),this.resetOTP();let e=this.getHMAC8(t),r=this.xotp(t);return M(v("#type","8",nt.ENC_PACK),v("#len","32L",t.byteLength),v("#salt12",this._otpSrc44.subarray(32)),v("#hmac8",e),v("#xdata",r))}decryptPack(t){if(t[0]!==nt.ENC_PACK)return;if(t.readUint32LE(1)==t.byteLength-ft.ENC_PACK)try{let e=H(t,it.ENC_PACK);if(!e)return;this.set_salt12(e.salt12),this.resetOTP();let r=e.$OTHERS,n=this.xotp(r),i=this.getHMAC8(n);if(V(e.hmac,i))return e.data=n,e}catch(t){}}encrypt_e2e(t,e){let r=_.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.encryptPack(t);return this._otpSrc44.set(r),n}decrypt_e2e(t,e){let r=_.Buffer.alloc(32);r.set(this._otpSrc44.subarray(0,32)),this.set_key(e);let n=this.decryptPack(t);return this._otpSrc44.set(r),n}}var at=_.Buffer;export{ht as Boho,nt as BohoMsg,at as Buffer,et as MBP,it as Meta,ft as MetaSize,ut as RAND,s as sha256};
diff --git a/lib/fast-sha256.d.ts b/lib/fast-sha256.d.ts
new file mode 100644
index 0000000..acd54e9
--- /dev/null
+++ b/lib/fast-sha256.d.ts
@@ -0,0 +1,39 @@
+export declare const digestLength: number;
+export declare const blockSize: number;
+export declare class Hash {
+    digestLength: number;
+    blockSize: number;
+    private state;
+    private temp;
+    private buffer;
+    private bufferLength;
+    private bytesHashed;
+    finished: boolean;
+    constructor();
+    reset(): this;
+    clean(): void;
+    update(data: Uint8Array, dataLength?: number): this;
+    finish(out: Uint8Array): this;
+    digest(): Uint8Array;
+    _saveState(out: Uint32Array): void;
+    _restoreState(from: Uint32Array, bytesHashed: number): void;
+}
+export declare class HMAC {
+    private inner;
+    private outer;
+    blockSize: number;
+    digestLength: number;
+    private istate;
+    private ostate;
+    constructor(key: Uint8Array);
+    reset(): this;
+    clean(): void;
+    update(data: Uint8Array): this;
+    finish(out: Uint8Array): this;
+    digest(): Uint8Array;
+}
+export declare function hash(data: Uint8Array): Uint8Array;
+export default hash;
+export declare function hmac(key: Uint8Array, data: Uint8Array): Uint8Array;
+export declare function hkdf(key: Uint8Array, salt?: Uint8Array, info?: Uint8Array, length?: number): Uint8Array;
+export declare function pbkdf2(password: Uint8Array, salt: Uint8Array, iterations: number, dkLen: number): Uint8Array;
diff --git a/lib/fast-sha256.js b/lib/fast-sha256.js
new file mode 100644
index 0000000..f4e7b42
--- /dev/null
+++ b/lib/fast-sha256.js
@@ -0,0 +1,401 @@
+// SHA-256 (+ HMAC and PBKDF2) for JavaScript.
+//
+// Written in 2014-2016 by Dmitry Chestnykh.
+// Public domain, no warranty.
+//
+// Functions (accept and return Uint8Arrays):
+//
+//   sha256(message) -> hash
+//   sha256.hmac(key, message) -> mac
+//   sha256.pbkdf2(password, salt, rounds, dkLen) -> dk
+//
+//  Classes:
+//
+//   new sha256.Hash()
+//   new sha256.HMAC(key)
+//
+export var digestLength = 32
+export var blockSize = 64
+// SHA-256 constants
+const K = new Uint32Array([
+  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
+  0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
+  0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
+  0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
+  0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+  0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
+  0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
+  0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
+  0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
+  0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+])
+function hashBlocks (w, v, p, pos, len) {
+  let a, b, c, d, e, f, g, h, u, i, j, t1, t2
+  while (len >= 64) {
+    a = v[0]
+    b = v[1]
+    c = v[2]
+    d = v[3]
+    e = v[4]
+    f = v[5]
+    g = v[6]
+    h = v[7]
+    for (i = 0; i < 16; i++) {
+      j = pos + i * 4
+      w[i] = (((p[j] & 0xff) << 24) | ((p[j + 1] & 0xff) << 16) |
+                ((p[j + 2] & 0xff) << 8) | (p[j + 3] & 0xff))
+    }
+    for (i = 16; i < 64; i++) {
+      u = w[i - 2]
+      t1 = (u >>> 17 | u << (32 - 17)) ^ (u >>> 19 | u << (32 - 19)) ^ (u >>> 10)
+      u = w[i - 15]
+      t2 = (u >>> 7 | u << (32 - 7)) ^ (u >>> 18 | u << (32 - 18)) ^ (u >>> 3)
+      w[i] = (t1 + w[i - 7] | 0) + (t2 + w[i - 16] | 0)
+    }
+    for (i = 0; i < 64; i++) {
+      t1 = (((((e >>> 6 | e << (32 - 6)) ^ (e >>> 11 | e << (32 - 11)) ^
+                (e >>> 25 | e << (32 - 25))) + ((e & f) ^ (~e & g))) | 0) +
+                ((h + ((K[i] + w[i]) | 0)) | 0)) | 0
+      t2 = (((a >>> 2 | a << (32 - 2)) ^ (a >>> 13 | a << (32 - 13)) ^
+                (a >>> 22 | a << (32 - 22))) + ((a & b) ^ (a & c) ^ (b & c))) | 0
+      h = g
+      g = f
+      f = e
+      e = (d + t1) | 0
+      d = c
+      c = b
+      b = a
+      a = (t1 + t2) | 0
+    }
+    v[0] += a
+    v[1] += b
+    v[2] += c
+    v[3] += d
+    v[4] += e
+    v[5] += f
+    v[6] += g
+    v[7] += h
+    pos += 64
+    len -= 64
+  }
+  return pos
+}
+// Hash implements SHA256 hash algorithm.
+const Hash = /** @class */ (function () {
+  function Hash () {
+    this.digestLength = digestLength
+    this.blockSize = blockSize
+    // Note: Int32Array is used instead of Uint32Array for performance reasons.
+    this.state = new Int32Array(8) // hash state
+    this.temp = new Int32Array(64) // temporary state
+    this.buffer = new Uint8Array(128) // buffer for data to hash
+    this.bufferLength = 0 // number of bytes in buffer
+    this.bytesHashed = 0 // number of total bytes hashed
+    this.finished = false // indicates whether the hash was finalized
+    this.reset()
+  }
+  // Resets hash state making it possible
+  // to re-use this instance to hash other data.
+  Hash.prototype.reset = function () {
+    this.state[0] = 0x6a09e667
+    this.state[1] = 0xbb67ae85
+    this.state[2] = 0x3c6ef372
+    this.state[3] = 0xa54ff53a
+    this.state[4] = 0x510e527f
+    this.state[5] = 0x9b05688c
+    this.state[6] = 0x1f83d9ab
+    this.state[7] = 0x5be0cd19
+    this.bufferLength = 0
+    this.bytesHashed = 0
+    this.finished = false
+    return this
+  }
+  // Cleans internal buffers and re-initializes hash state.
+  Hash.prototype.clean = function () {
+    for (var i = 0; i < this.buffer.length; i++) {
+      this.buffer[i] = 0
+    }
+    for (var i = 0; i < this.temp.length; i++) {
+      this.temp[i] = 0
+    }
+    this.reset()
+  }
+  // Updates hash state with the given data.
+  //
+  // Optionally, length of the data can be specified to hash
+  // fewer bytes than data.length.
+  //
+  // Throws error when trying to update already finalized hash:
+  // instance must be reset to use it again.
+  Hash.prototype.update = function (data, dataLength) {
+    if (dataLength === void 0) { dataLength = data.length }
+    if (this.finished) {
+      throw new Error("SHA256: can't update because hash was finished.")
+    }
+    let dataPos = 0
+    this.bytesHashed += dataLength
+    if (this.bufferLength > 0) {
+      while (this.bufferLength < 64 && dataLength > 0) {
+        this.buffer[this.bufferLength++] = data[dataPos++]
+        dataLength--
+      }
+      if (this.bufferLength === 64) {
+        hashBlocks(this.temp, this.state, this.buffer, 0, 64)
+        this.bufferLength = 0
+      }
+    }
+    if (dataLength >= 64) {
+      dataPos = hashBlocks(this.temp, this.state, data, dataPos, dataLength)
+      dataLength %= 64
+    }
+    while (dataLength > 0) {
+      this.buffer[this.bufferLength++] = data[dataPos++]
+      dataLength--
+    }
+    return this
+  }
+  // Finalizes hash state and puts hash into out.
+  //
+  // If hash was already finalized, puts the same value.
+  Hash.prototype.finish = function (out) {
+    if (!this.finished) {
+      const bytesHashed = this.bytesHashed
+      const left = this.bufferLength
+      const bitLenHi = (bytesHashed / 0x20000000) | 0
+      const bitLenLo = bytesHashed << 3
+      const padLength = (bytesHashed % 64 < 56) ? 64 : 128
+      this.buffer[left] = 0x80
+      for (var i = left + 1; i < padLength - 8; i++) {
+        this.buffer[i] = 0
+      }
+      this.buffer[padLength - 8] = (bitLenHi >>> 24) & 0xff
+      this.buffer[padLength - 7] = (bitLenHi >>> 16) & 0xff
+      this.buffer[padLength - 6] = (bitLenHi >>> 8) & 0xff
+      this.buffer[padLength - 5] = (bitLenHi >>> 0) & 0xff
+      this.buffer[padLength - 4] = (bitLenLo >>> 24) & 0xff
+      this.buffer[padLength - 3] = (bitLenLo >>> 16) & 0xff
+      this.buffer[padLength - 2] = (bitLenLo >>> 8) & 0xff
+      this.buffer[padLength - 1] = (bitLenLo >>> 0) & 0xff
+      hashBlocks(this.temp, this.state, this.buffer, 0, padLength)
+      this.finished = true
+    }
+    for (var i = 0; i < 8; i++) {
+      out[i * 4 + 0] = (this.state[i] >>> 24) & 0xff
+      out[i * 4 + 1] = (this.state[i] >>> 16) & 0xff
+      out[i * 4 + 2] = (this.state[i] >>> 8) & 0xff
+      out[i * 4 + 3] = (this.state[i] >>> 0) & 0xff
+    }
+    return this
+  }
+  // Returns the final hash digest.
+  Hash.prototype.digest = function () {
+    const out = new Uint8Array(this.digestLength)
+    this.finish(out)
+    return out
+  }
+  // Internal function for use in HMAC for optimization.
+  Hash.prototype._saveState = function (out) {
+    for (let i = 0; i < this.state.length; i++) {
+      out[i] = this.state[i]
+    }
+  }
+  // Internal function for use in HMAC for optimization.
+  Hash.prototype._restoreState = function (from, bytesHashed) {
+    for (let i = 0; i < this.state.length; i++) {
+      this.state[i] = from[i]
+    }
+    this.bytesHashed = bytesHashed
+    this.finished = false
+    this.bufferLength = 0
+  }
+  return Hash
+}())
+export { Hash }
+// HMAC implements HMAC-SHA256 message authentication algorithm.
+const HMAC = /** @class */ (function () {
+  function HMAC (key) {
+    this.inner = new Hash()
+    this.outer = new Hash()
+    this.blockSize = this.inner.blockSize
+    this.digestLength = this.inner.digestLength
+    const pad = new Uint8Array(this.blockSize)
+    if (key.length > this.blockSize) {
+      (new Hash()).update(key).finish(pad).clean()
+    } else {
+      for (var i = 0; i < key.length; i++) {
+        pad[i] = key[i]
+      }
+    }
+    for (var i = 0; i < pad.length; i++) {
+      pad[i] ^= 0x36
+    }
+    this.inner.update(pad)
+    for (var i = 0; i < pad.length; i++) {
+      pad[i] ^= 0x36 ^ 0x5c
+    }
+    this.outer.update(pad)
+    this.istate = new Uint32Array(8)
+    this.ostate = new Uint32Array(8)
+    this.inner._saveState(this.istate)
+    this.outer._saveState(this.ostate)
+    for (var i = 0; i < pad.length; i++) {
+      pad[i] = 0
+    }
+  }
+  // Returns HMAC state to the state initialized with key
+  // to make it possible to run HMAC over the other data with the same
+  // key without creating a new instance.
+  HMAC.prototype.reset = function () {
+    this.inner._restoreState(this.istate, this.inner.blockSize)
+    this.outer._restoreState(this.ostate, this.outer.blockSize)
+    return this
+  }
+  // Cleans HMAC state.
+  HMAC.prototype.clean = function () {
+    for (let i = 0; i < this.istate.length; i++) {
+      this.ostate[i] = this.istate[i] = 0
+    }
+    this.inner.clean()
+    this.outer.clean()
+  }
+  // Updates state with provided data.
+  HMAC.prototype.update = function (data) {
+    this.inner.update(data)
+    return this
+  }
+  // Finalizes HMAC and puts the result in out.
+  HMAC.prototype.finish = function (out) {
+    if (this.outer.finished) {
+      this.outer.finish(out)
+    } else {
+      this.inner.finish(out)
+      this.outer.update(out, this.digestLength).finish(out)
+    }
+    return this
+  }
+  // Returns message authentication code.
+  HMAC.prototype.digest = function () {
+    const out = new Uint8Array(this.digestLength)
+    this.finish(out)
+    return out
+  }
+  return HMAC
+}())
+export { HMAC }
+// Returns SHA256 hash of data.
+export function hash (data) {
+  const h = (new Hash()).update(data)
+  const digest = h.digest()
+  h.clean()
+  return digest
+}
+// Function hash is both available as module.hash and as default export.
+export default hash
+// Returns HMAC-SHA256 of data under the key.
+export function hmac (key, data) {
+  const h = (new HMAC(key)).update(data)
+  const digest = h.digest()
+  h.clean()
+  return digest
+}
+// Fills hkdf buffer like this:
+// T(1) = HMAC-Hash(PRK, T(0) | info | 0x01)
+function fillBuffer (buffer, hmac, info, counter) {
+  // Counter is a byte value: check if it overflowed.
+  const num = counter[0]
+  if (num === 0) {
+    throw new Error('hkdf: cannot expand more')
+  }
+  // Prepare HMAC instance for new data with old key.
+  hmac.reset()
+  // Hash in previous output if it was generated
+  // (i.e. counter is greater than 1).
+  if (num > 1) {
+    hmac.update(buffer)
+  }
+  // Hash in info if it exists.
+  if (info) {
+    hmac.update(info)
+  }
+  // Hash in the counter.
+  hmac.update(counter)
+  // Output result to buffer and clean HMAC instance.
+  hmac.finish(buffer)
+  // Increment counter inside typed array, this works properly.
+  counter[0]++
+}
+const hkdfSalt = new Uint8Array(digestLength) // Filled with zeroes.
+export function hkdf (key, salt, info, length) {
+  if (salt === void 0) { salt = hkdfSalt }
+  if (length === void 0) { length = 32 }
+  const counter = new Uint8Array([1])
+  // HKDF-Extract uses salt as HMAC key, and key as data.
+  const okm = hmac(salt, key)
+  // Initialize HMAC for expanding with extracted key.
+  // Ensure no collisions with `hmac` function.
+  const hmac_ = new HMAC(okm)
+  // Allocate buffer.
+  const buffer = new Uint8Array(hmac_.digestLength)
+  let bufpos = buffer.length
+  const out = new Uint8Array(length)
+  for (let i = 0; i < length; i++) {
+    if (bufpos === buffer.length) {
+      fillBuffer(buffer, hmac_, info, counter)
+      bufpos = 0
+    }
+    out[i] = buffer[bufpos++]
+  }
+  hmac_.clean()
+  buffer.fill(0)
+  counter.fill(0)
+  return out
+}
+// Derives a key from password and salt using PBKDF2-HMAC-SHA256
+// with the given number of iterations.
+//
+// The number of bytes returned is equal to dkLen.
+//
+// (For better security, avoid dkLen greater than hash length - 32 bytes).
+export function pbkdf2 (password, salt, iterations, dkLen) {
+  const prf = new HMAC(password)
+  const len = prf.digestLength
+  const ctr = new Uint8Array(4)
+  const t = new Uint8Array(len)
+  const u = new Uint8Array(len)
+  const dk = new Uint8Array(dkLen)
+  for (var i = 0; i * len < dkLen; i++) {
+    const c = i + 1
+    ctr[0] = (c >>> 24) & 0xff
+    ctr[1] = (c >>> 16) & 0xff
+    ctr[2] = (c >>> 8) & 0xff
+    ctr[3] = (c >>> 0) & 0xff
+    prf.reset()
+    prf.update(salt)
+    prf.update(ctr)
+    prf.finish(u)
+    for (var j = 0; j < len; j++) {
+      t[j] = u[j]
+    }
+    for (var j = 2; j <= iterations; j++) {
+      prf.reset()
+      prf.update(u).finish(u)
+      for (let k = 0; k < len; k++) {
+        t[k] ^= u[k]
+      }
+    }
+    for (var j = 0; j < len && i * len + j < dkLen; j++) {
+      dk[i * len + j] = t[j]
+    }
+  }
+  for (var i = 0; i < len; i++) {
+    t[i] = u[i] = 0
+  }
+  for (var i = 0; i < 4; i++) {
+    ctr[i] = 0
+  }
+  prf.clean()
+  return dk
+}
diff --git a/package.json b/package.json
index b3d7b25..f0eda70 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "boho",
-  "version": "0.2.1",
+  "version": "0.5.0",
   "description": "Ultra Light SSL without PKI.",
   "cjs": "dist/boho.cjs",
   "esm": "dist/boho.mjs",
@@ -12,13 +12,14 @@
     "require": "./dist/boho.cjs"
   },
   "scripts": {
+    "build": "rollup -c",
     "test": "mocha"
   },
   "keywords": [
     "SSL",
     "cipher",
     "crypto",
-    "encrypt",
+    "encryption",
     "보호",
     "암호"
   ],
@@ -33,7 +34,12 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "mocha": "^10.0.0"
+    "@rollup/plugin-commonjs": "^17.0.0",
+    "@rollup/plugin-node-resolve": "^11.1.0",
+    "@rollup/plugin-replace": "^4.0.0",
+    "@rollup/plugin-terser": "^0.4.0",
+    "mocha": "^10.0.0",
+    "rollup": "^2.74.1"
   },
   "dependencies": {
     "meta-buffer-pack": "^1.3.0"
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..8b9f4f1
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,62 @@
+import replace from '@rollup/plugin-replace'
+import resolve from '@rollup/plugin-node-resolve'
+import commonjs from '@rollup/plugin-commonjs'
+import terser from '@rollup/plugin-terser'
+import pkg from './package.json'
+
+export default [
+  {
+    input: 'src/browserDefault.js',
+    output: [
+      {
+        name: 'Boho',
+        file: pkg.browser,
+        format: 'iife',
+        sourcemap: true
+      }
+    ],
+    plugins: [
+      replace({
+        crypto: '',
+        delimiters: ['import { webcrypto } from \'', '\''],
+        preventAssignment: true
+      }),
+      resolve(),
+      commonjs()
+      , terser()
+    ]
+  },
+  {
+    input: 'src/boho.js',
+    output: [
+      {
+        file: pkg.browser_esm,
+        format: 'es',
+        sourcemap: true
+      }
+    ],
+    plugins: [
+      replace({
+        crypto: '',
+        delimiters: ['import { webcrypto } from \'', '\''],
+        preventAssignment: true
+      }),
+      resolve(),
+      commonjs()
+      , terser()
+    ]
+  },
+
+  {
+    input: 'src/boho.js',
+    output: [
+      { file: pkg.cjs, format: 'cjs' },
+      { file: pkg.esm, format: 'es' }
+    ],
+    plugins: [
+      resolve(),
+      commonjs()
+      , terser()
+    ]
+  }
+]
diff --git a/src/boho.js b/src/boho.js
new file mode 100644
index 0000000..990cf43
--- /dev/null
+++ b/src/boho.js
@@ -0,0 +1,457 @@
+import { sha256 } from './sha256-mbp.js'
+import { MBP, Buffer } from 'meta-buffer-pack'
+export { sha256, MBP, Buffer }
+
+import { webcrypto } from 'crypto'
+import { BohoMsg, Meta, MetaSize } from "./constants.js"
+export { BohoMsg, Meta, MetaSize }
+
+let isNode = false
+try {
+  isNode = Object.prototype.toString.call(global.process) === '[object process]'
+} catch (e) { }
+
+
+export function RAND(size) {
+  if( isNode ){
+    return webcrypto.getRandomValues(Buffer.alloc(size))
+  }else{
+    return self.crypto.getRandomValues(Buffer.alloc(size))
+  }
+}
+
+
+
+export class Boho {
+  // A. Core
+  constructor() {
+
+    this._id8 = Buffer.alloc(8)
+    this._otpSrc44 = Buffer.alloc(44)
+    this._otp36 = Buffer.alloc(36)
+    this._hmac = Buffer.alloc(32)
+
+    this.auth_salt12 = Buffer.alloc(12)
+    this.localNonce = Buffer.alloc(4)
+    this.remoteNonce = Buffer.alloc(4)
+    this.isAuthorized = false
+
+  }
+
+  clearAuth(){
+    this._id8.fill(0)
+    this._otpSrc44.fill(0)
+    this._otp36.fill(0)
+    this._hmac.fill(0)
+    this.auth_salt12.fill(0)
+    this.localNonce.fill(0)
+    this.remoteNonce.fill(0)
+    this.isAuthorized = false
+  }
+
+  // for the self
+  set_id8(data) {
+    let encStr = MBP.B8(data)
+    this._id8.fill(0)
+    encStr.copy(this._id8, 0, 0, 8)
+  }
+
+  set_hash_id8(data) {
+    let idSum = MBP.B8(sha256.hash(data))
+    idSum.copy(this._id8, 0, 0, 8)
+  }
+
+
+  set_key(data) {
+    let keySum = MBP.B8(sha256.hash(data))
+    keySum.copy(this._otpSrc44, 0, 0, 32)
+  }
+
+  // for the remote client.
+  copy_id8(data) {
+    data.copy(this._id8, 0, 0, 8)
+  }
+
+  // for the remote client.
+  copy_key(data) {
+    data.copy(this._otpSrc44, 0, 0, 32)
+  }
+
+
+  sha256_n(srcData, n) {
+    let hashSum = sha256.hash(srcData)
+    for (let i = 0; i < n; i++) hashSum = sha256.hash(hashSum)
+    return hashSum
+  }
+
+
+  // useful general encryption  i.e. enc_pack
+  set_clock_rand() {
+
+    let milTime = Date.now()
+    let secTime = parseInt(milTime / 1000)
+    milTime = milTime % 0xffffffff
+    const salt12 = Buffer.concat([
+     MBP.NB('32L', secTime),
+     MBP.NB('32L', milTime),
+      RAND(4)
+    ])
+
+    salt12.copy(this._otpSrc44, 32)
+  }
+
+  // for secure communication sender. 
+  set_clock_nonce(nonce) {
+    let milTime = Date.now()
+    let secTime = parseInt(milTime / 1000)
+    milTime = milTime % 0xffffffff
+    const salt12 = Buffer.concat([
+     MBP.NB('32L', secTime),
+     MBP.NB('32L', milTime),
+      nonce
+    ])
+
+    salt12.copy(this._otpSrc44, 32)
+  }
+
+
+  set_salt12(salt12) {
+    salt12.copy(this._otpSrc44, 32)
+  }
+
+  resetOTP() {
+    let otp32 = MBP.B8(sha256.hash(this._otpSrc44))
+    otp32.copy(this._otp36, 0, 0, 32)
+  }
+
+  getIndexOTP(otpIndex) {
+    this._otp36.writeUInt32LE(otpIndex, 32)
+    return sha256.hash(this._otp36)
+  }
+
+
+  generateHMAC(data) {
+    let hmacSrc = Buffer.concat([this._otpSrc44, data])
+    this._hmac = MBP.B8(sha256.hash(hmacSrc))
+  }
+
+  // return 8 bytes of hash
+  getHMAC8(data) {
+    let hmacSrc = Buffer.concat([this._otpSrc44, data])
+    this._hmac = MBP.B8(sha256.hash(hmacSrc))
+    return this._hmac.subarray(0, 8)
+  }
+
+  xotp(data, otpStartIndex = 0, shareDataBuffer = false) {
+
+    data = MBP.B8(data, shareDataBuffer)
+
+    let len = data.byteLength
+    let otpIndex = otpStartIndex
+    let dataOffset = 0
+    let xorCalcLen = 0
+
+    while (len > 0) {
+      xorCalcLen = len < 32 ? len : 32
+      let iotp = this.getIndexOTP(++otpIndex);
+      for (let i = 0; i < xorCalcLen; i++) {
+        data[dataOffset++] ^= iotp[i]
+      }
+      len -= 32
+    }
+    return data
+  }
+
+  // B. AUTH process
+
+  // step 1
+  // client send AUTH_REQ
+  auth_req() {
+    return MBP.pack(
+      MBP.MB('#type', '8', BohoMsg.AUTH_REQ),
+      MBP.MB('#reserved', '8', 0)
+    )
+  }
+
+  // step 2
+  // server send AUTH_NONCE
+  auth_nonce() {
+    let now = Date.now()
+    let unixTime = Math.floor(now / 1000)
+    let milTime = now % 1000
+    this.localNonce = RAND(4)
+    this.auth_salt12 = Buffer.concat([
+     MBP.NB('32L', unixTime),
+     MBP.NB('32L', milTime),
+      this.localNonce
+    ])
+
+    let infoPack = Buffer.concat([
+     MBP.NB('8', BohoMsg.AUTH_NONCE),
+      this.auth_salt12
+    ])
+    return infoPack
+  }
+
+
+  // step 3
+  // client send AUTH_HMAC
+  // input :  auth_nonce buffer
+  auth_hmac(buffer) {
+    let auth_nonce = MBP.unpack(buffer, Meta.AUTH_NONCE)
+    if (auth_nonce) {
+      // console.log(' auth nonce', auth_nonce )
+
+      // let now = Date.now()
+      // let localUTC= Math.floor( now/ 1000 )
+      // let localMilTime = now % 1000
+
+      // console.log('time server [sec]', auth_nonce.unixTime, auth_nonce.milTime )
+      // console.log('time client [sec]', localUTC , localMilTime )
+      // console.log('time diff client and server[sec]', auth_nonce.unixTime - localUTC )
+
+      // let serverSecMil = auth_nonce.unixTime * 1000 + auth_nonce.milTime
+      // console.log('time diff msec client and server[msec]', serverSecMil - now )
+
+      let salt12 = Buffer.concat([
+       MBP.NB('32L', auth_nonce.unixTime),
+       MBP.NB('32L', auth_nonce.milTime),
+        auth_nonce.nonce
+      ])
+
+      this.set_salt12(salt12)
+
+      this.localNonce = RAND(4)
+      // hmac( key, sec,mil,serverNonce, localNonce)
+      this.generateHMAC(this.localNonce)
+
+      // let hmac8 = this._hmac.subarray(0, 8)
+
+      this.remoteNonce = auth_nonce.nonce
+
+      let auth_hmac_buffer = MBP.pack( // 21 -> 45
+       MBP.MB('#header', '8', BohoMsg.AUTH_HMAC),
+       MBP.MB('#id8', this._id8),
+       MBP.MB('#nonce', this.localNonce),
+       MBP.MB('#hmac32', this._hmac ), //full 32bytes hash
+      )
+
+      return auth_hmac_buffer
+    }
+    return false
+  }
+
+  /*  
+      step 4.  for server
+  
+      step 4-1. check client's auth_hmac
+      step 4-2. reply result
+          send AUTH_ACK  with another HMAC for client.
+          or send AUTH_FAIL when fail.
+   */
+
+  // input: unpack object or buffer of auth_hmac
+  check_auth_hmac(data) {
+    let infoPack
+    if (data instanceof Uint8Array) {
+      infoPack = MBP.unpack(data, Meta.AUTH_HMAC)
+      if (!infoPack) {
+        // console.log('auth_hamc unpack fail.')
+        return
+      }
+    } else {
+      infoPack = data;
+
+    }
+    // console.log('auth_hamc infoObj', infoPack )
+
+    this.set_salt12(this.auth_salt12)
+
+    // hmac( key, sec,mil,serverNonce, clientNonce)
+    this.generateHMAC(infoPack.nonce)
+    // let hmac8 = this._hmac.subarray(0, 8)
+    let hmac32 = this._hmac
+
+    if (MBP.equal(infoPack.hmac32, hmac32)) {
+      //Auth success then store client nonce.
+      this.remoteNonce = infoPack.nonce
+
+      let salt12 = Buffer.concat([
+        this.localNonce,
+        this.remoteNonce,
+        this.localNonce
+      ])
+      this.set_salt12(salt12)
+      this.generateHMAC(infoPack.nonce)
+      let replyHMAC = this._hmac
+
+      let auth_ack = MBP.rawPack( 
+       MBP.MB('header', '8', BohoMsg.AUTH_ACK),
+       MBP.MB('hmac32', replyHMAC)
+      )
+      this.isAuthorized = true
+      return auth_ack
+    }
+    return false
+  }
+
+
+
+  // step 5.  cross check
+  // client check server's hmac.  
+  check_auth_ack_hmac(buffer) {
+    // server response has hmac ( key + clientNonce)
+    let auth_ack = MBP.unpack(buffer, Meta.AUTH_ACK)
+    if (auth_ack) {
+      let salt12 = Buffer.concat([
+        this.remoteNonce,
+        this.localNonce,
+        this.remoteNonce,
+      ])
+      this.set_salt12(salt12)
+      this.generateHMAC(this.localNonce)
+      // let hmac8 = this._hmac.subarray(0, 8)
+      let hmac32 = this._hmac
+      //server side hmac using client nonce.
+      if (MBP.equal(hmac32, auth_ack.hmac32)) {
+        this.isAuthorized = true
+        return true
+      }
+    }
+    // server hmac error
+    return
+  }
+
+  // C. Secure Communication
+
+  // Must AUTH first.
+  encrypt_488(data) {  // payload max about 2^32 bytes.
+    if (!this.isAuthorized) return
+
+    data = MBP.B8(data)
+
+    this.set_clock_nonce(this.remoteNonce)
+    this.resetOTP()
+
+    let hmac8 = this.getHMAC8(data)
+    let encData = this.xotp(data)
+
+    let pack = MBP.pack(
+      MBP.MB('#type', '8', BohoMsg.ENC_488),
+      MBP.MB('#len', '32L', data.byteLength),
+      MBP.MB('#otpSrc8', this._otpSrc44.subarray(32, 40)),
+      MBP.MB('#hmac8', hmac8),
+      MBP.MB('#xdata', encData)
+    )
+    // console.log('enc pack result', pack )
+    return pack
+  }
+
+
+  decrypt_488(data) {
+    data = MBP.B8(data)
+
+    let pack = MBP.unpack(data, Meta.ENC_488)
+
+    if (pack) {
+
+      let salt12 = Buffer.concat([
+        pack.otpSrc8,
+        this.localNonce
+      ])
+
+      this.set_salt12(salt12)
+      this.resetOTP()
+
+      let xdata = pack.$OTHERS.subarray(0, pack.len)
+      let decData = this.xotp(xdata)
+
+      let hmac8 = this.getHMAC8(decData)
+
+      if (MBP.equal(hmac8, pack.hmac8)) return decData
+
+      // console.log('hmac dismatch', decData )
+    } else {
+      // console.log('unpack fail')
+    }
+  }
+
+
+  // maxium data size is 2**32 -1 bytes.
+  encryptPack(data) {
+    data = MBP.B8(data)
+
+    this.set_clock_rand()
+    this.resetOTP()
+
+    let hmac8 = this.getHMAC8(data)
+    let encData = this.xotp(data)
+
+    let pack = MBP.pack(
+      MBP.MB('#type', '8', BohoMsg.ENC_PACK),
+      MBP.MB('#len', '32L', data.byteLength),
+      MBP.MB('#salt12', this._otpSrc44.subarray(32)),
+      MBP.MB('#hmac8', hmac8),
+      MBP.MB('#xdata', encData)
+    )
+    return pack
+  }
+
+
+  decryptPack(data) {
+
+    if (data[0] !== BohoMsg.ENC_PACK) {
+      // console.log('Boho: Invalid packType')
+      return
+    }
+
+    // packLength
+    let readPackLen = data.readUint32LE(1);
+    if (readPackLen != data.byteLength - MetaSize.ENC_PACK) {
+      // console.log('Boho: Invalid LEN data_len: data.byteLen' , readPackLen, data.byteLength)
+      return
+    }
+
+    try {
+      let pack = MBP.unpack(data, Meta.ENC_PACK)
+      //  console.log('unpack result', pack )
+      if (!pack) return
+
+      this.set_salt12(pack.salt12)
+      this.resetOTP()
+
+      let xdata = pack.$OTHERS
+      let decData = this.xotp(xdata)
+      let hmac8 = this.getHMAC8(decData)
+
+      if (MBP.equal(pack.hmac, hmac8)) {
+        pack.data = decData
+        return pack
+      }
+      // console.log('Invalid HMAC', pack.hmac, hmac8 )
+
+    } catch (error) {
+      // console.log('Boho: unpack err', error )
+
+    }
+  }
+
+  encrypt_e2e(data, key) {
+    let baseKey = Buffer.alloc(32)
+    baseKey.set(this._otpSrc44.subarray(0, 32))
+    this.set_key(key)
+    let pack = this.encryptPack(data)
+    this._otpSrc44.set(baseKey)
+    return pack;
+  }
+
+  decrypt_e2e(data, key) {
+    let baseKey = Buffer.alloc(32)
+    baseKey.set(this._otpSrc44.subarray(0, 32))
+    this.set_key(key)
+    let decPack = this.decryptPack(data)
+    this._otpSrc44.set(baseKey)
+    return decPack
+  }
+
+}
diff --git a/src/browserDefault.js b/src/browserDefault.js
new file mode 100644
index 0000000..25ab610
--- /dev/null
+++ b/src/browserDefault.js
@@ -0,0 +1,11 @@
+import { Boho, RAND, MBP, BohoMsg, Meta, MetaSize , sha256, Buffer } from './boho.js'
+
+Boho.RAND = RAND;
+Boho.BohoMsg = BohoMsg;
+Boho.Meta = Meta;
+Boho.MetaSize = MetaSize;
+Boho.sha256 = sha256;
+Boho.MBP = MBP;
+Boho.Buffer = Buffer;
+
+export default Boho;
\ No newline at end of file
diff --git a/src/constants.js b/src/constants.js
new file mode 100644
index 0000000..f95484b
--- /dev/null
+++ b/src/constants.js
@@ -0,0 +1,90 @@
+import{ MBP, Buffer} from "meta-buffer-pack"
+const MB = MBP.MB
+
+
+// remocon message pack one byte header. 
+export let BohoMsg = {
+  AUTH_REQ : 0xB0,  
+  AUTH_NONCE: 0xB1,
+  AUTH_HMAC: 0xB2,
+  AUTH_ACK: 0xB3,
+  AUTH_FAIL: 0xB4,
+  AUTH_EXT: 0xB5,
+  ENC_PACK : 0xB6,  
+  ENC_E2E : 0xB7,  
+  ENC_488 : 0xB8
+}
+
+for (let c in BohoMsg) { BohoMsg[BohoMsg[c]] = c }
+
+export const Meta = {
+
+  AUTH_REQ: MBP.meta(  // 2
+    MB('header','8', 0),
+    MB('reserved','8', 0)
+  ),
+
+  AUTH_NONCE: MBP.meta(  // 13
+    MB('header','8', 0),
+    MB('unixTime','32L', 0),
+    MB('milTime','32L', 0 ),
+    MB('nonce', Buffer.alloc(4))
+  ),
+
+  AUTH_HMAC: MBP.meta( // 45
+    MB('header','8', 0),
+    MB('id8',Buffer.alloc(8)),
+    MB('nonce', Buffer.alloc(4)),
+    MB('hmac32', Buffer.alloc(32))
+  ),
+    
+  AUTH_ACK: MBP.meta( // 33
+    MB('header','8', 0),
+    MB('hmac32', Buffer.alloc(32))
+  ),
+    
+
+  ENC_PACK: MBP.meta(  //25 + payload
+    MB('type','8',0),
+    MB('len','32L',0),  // pure xdata size.  
+    MB('salt12', Buffer.alloc(12)),  // sec,mil,rand
+    MB('hmac',8,0)
+    // MB( 'xdata', encData )
+    ),
+
+
+  ENC_488: MBP.meta(   // 21 + payload
+    MB('type','8', 0 ),
+    MB('len','32L', 0 ),
+    MB('otpSrc8', Buffer.alloc(8) ),
+    MB('hmac8', Buffer.alloc(8) )
+    // MB('xdata', encData ) 
+    )
+
+
+  }
+
+
+  function getMetaSize(meta){
+    let lastItem = meta[ meta.length - 1]
+    return lastItem[2] + lastItem[3]
+  }
+
+  export const MetaSize = {
+    AUTH_REQ: getMetaSize( Meta.AUTH_REQ ),
+    AUTH_NONCE: getMetaSize( Meta.AUTH_NONCE ),
+    AUTH_HMAC: getMetaSize( Meta.AUTH_HMAC ),
+    AUTH_ACK: getMetaSize( Meta.AUTH_ACK ),
+    ENC_PACK: getMetaSize( Meta.ENC_PACK ),
+    ENC_488: getMetaSize( Meta.ENC_488 )
+  }
+
+// console.log( 'boho MetaSize', MetaSize )
+// boho MetaSize {
+//   AUTH_REQ: 2,
+//   AUTH_NONCE: 13,
+//   AUTH_HMAC: 45,
+//   AUTH_ACK: 33,
+//   ENC_PACK: 25,
+//   ENC_488: 21
+// }
\ No newline at end of file
diff --git a/src/sha256-mbp.js b/src/sha256-mbp.js
new file mode 100644
index 0000000..c0fcd59
--- /dev/null
+++ b/src/sha256-mbp.js
@@ -0,0 +1,16 @@
+import { hash as sha256, hmac } from '../lib/fast-sha256.js'
+import { MBP } from 'meta-buffer-pack'
+
+sha256.hash = function (data) {
+  return sha256(MBP.U8(data))
+}
+
+sha256.hex = function (data) {
+  return MBP.hex(sha256.hash(data))
+}
+
+sha256.hmac = function (key, data) {
+  return hmac(MBP.U8(key), MBP.U8(data))
+}
+
+export { sha256 }