fix(return) change to i32[]

assembly/__tests__/example.spec.ts

@@ -23,7 +23,8 @@ describe("rabin degree", (): void => {
   it("fingerprint", (): void => {
     let r = new Rabin(14, 1 * 8, 2 * 8, 64)
     let file = getFile()
-    r.fingerprint(file, new Int32Array(file.length/8))
+    let result = r.fingerprint(file)
+    // todo: inspect result
   });
 
 });

assembly/index.ts

@@ -175,10 +175,11 @@ export class Rabin {
     rabin_init(this)
   }
 
-  fingerprint(buf: Uint8Array, lengths: Int32Array): void {
+  fingerprint(buf: Uint8Array): i32[] {
     let len = buf.length;
-    let chunk_idx = 0;
     let ptr = changetype<usize>(buf.buffer)
+    let result = new Array<i32>(0);
+
     while (1) {
       var remaining = rabin_next_chunk(this, ptr, len);
       if (remaining < 0) {
@@ -187,16 +188,12 @@ export class Rabin {
 
       len -= remaining;
       ptr += remaining;
-      let c = chunk_idx++
-      unchecked(lengths[c] = <i32>this.chunk_length)
+      result.push(<i32>this.chunk_length);
     }
+    return result;
   }
 }
 
 export function getUint8ArrayTypeId(): i32 {
   return idof<Uint8Array>();
 }
-
-export function getInt32ArrayTypeId(): i32 {
-  return idof<Int32Array>();
-}

src/rabin.js

@@ -28,34 +28,19 @@ class Rabin {
      * @memberof Rabin
      */
     fingerprint(buf) {
-        const lengths = new Int32Array(Math.ceil(buf.length/this.min))
         const u8arraytype = this.asModule.getUint8ArrayTypeId()
-        const i32arraytype = this.asModule.getInt32ArrayTypeId()
-        const lengthsPtr = this.asModule.__retain(this.asModule.__allocArray(i32arraytype, lengths))
         const pointer = this.asModule.__retain(this.asModule.__allocArray(u8arraytype, buf))
 
         // run finderprint
-        this.rabin.fingerprint(pointer, lengthsPtr)
+        const processedPointer = this.rabin.fingerprint(pointer)
 
-        const processed = this.asModule.__getArray(lengthsPtr)
-
-        //free memory
-        this.asModule.freeArray(lengthsPtr)
-        this.asModule.freeArray(pointer)
-
-        // TODO: remove this. @see https://github.com/ipfs/js-ipfs/issues/2118#issuecomment-497722625
-        // clean extra 0s in the array
-        const cleanArr = []
-        for (let i = 0; i < processed.length; i++) {
-            if (processed[i] === 0) break
-            cleanArr[i] = processed[i];
-        }
+        const processed = this.asModule.__getArray(processedPointer)
 
         // release memory
-        this.asModule.__release(lengthsPtr)
         this.asModule.__release(pointer)
+        this.asModule.__release(processedPointer)
 
-        return cleanArr
+        return processed
     }
 }