Added compressToCustom and decompressFromCustom function (#183)

src/custom/compressToCustom.ts

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2013 Pieroxy <pieroxy@pieroxy.net>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { compress } from "../stock/compress";
+
+export function compressToCustom (uncompressed: string | null, dict: string): string {
+    if (uncompressed == null) return "";
+
+    const compressed: string = compress(uncompressed);
+    const charsPerUnicodeChar: number = Math.ceil(Math.log(65536) / Math.log(dict.length));
+    let res: string = "";
+
+    for (let i = 0, TotalLen = compressed.length; i < TotalLen; i++) {
+      let current_value = compressed.charCodeAt(i);
+
+      for (let j = charsPerUnicodeChar-1; j >= 0; j--) {
+        const selector = Math.floor(current_value / Math.pow(dict.length, j));
+        current_value = current_value % Math.pow(dict.length, j);
+        res += dict.charAt(selector);
+      }
+    }
+
+    return res;
+}

src/custom/custom.test.ts

@@ -0,0 +1,35 @@
+/*
+ * SPDX-FileCopyrightText: 2013 Pieroxy <pieroxy@pieroxy.net>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { describe } from "vitest";
+import { compressToCustom, decompressFromCustom } from ".";
+import { runTestSet } from "../__tests__/testFunctions";
+
+describe("custom", () => {
+    describe("hex", () => {
+        const hex = "0123456789ABCDEF";
+        const compress = (input: string | null) => compressToCustom(input, hex);
+        const decompress = (input: string | null) => decompressFromCustom(input, hex);
+
+        runTestSet<string>(compress, decompress, "");
+    });
+
+    describe("23 letter heterogram", () => {
+        const heterogram = "BlockyDwarfZingsTheJump";
+        const compress = (input: string | null) => compressToCustom(input, heterogram);
+        const decompress = (input: string | null) => decompressFromCustom(input, heterogram);
+
+        runTestSet<string>(compress, decompress, "");
+    });
+
+    describe("base62", () => {
+        const base62 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+        const compress = (input: string | null) => compressToCustom(input, base62);
+        const decompress = (input: string | null) => decompressFromCustom(input, base62);
+
+        runTestSet<string>(compress, decompress, "");
+    });
+});

src/custom/decompressFromCustom.ts

@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: 2013 Pieroxy <pieroxy@pieroxy.net>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { decompress } from "../stock/decompress";
+
+export function decompressFromCustom (compressed: string | null, dict: string): string | null {
+    if (compressed == null) return "";
+    if (compressed == "") return null;
+    if (dict.length < 2) return null;
+
+    const charsPerUnicodeChar: number = Math.ceil(Math.log(65536) / Math.log(dict.length));
+
+    if (compressed.length % charsPerUnicodeChar != 0) return null;
+
+    let res: string = "";
+    let current_value;
+    let index;
+
+    for (let i = 0, TotalLen = compressed.length; i < TotalLen; i=i+charsPerUnicodeChar) {
+      current_value = 0;
+
+      for (let j = 0; j < charsPerUnicodeChar; j++) {
+        index = dict.indexOf(compressed[i+j]);
+        current_value = current_value + (index * Math.pow(dict.length, charsPerUnicodeChar - 1 - j));
+      }
+
+      res = res + String.fromCharCode(current_value);
+    }
+
+    return decompress(res);
+}

src/custom/index.ts

@@ -0,0 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: 2013 Pieroxy <pieroxy@pieroxy.net>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+export { compressToCustom } from "./compressToCustom";
+export { decompressFromCustom } from "./decompressFromCustom";

src/index.ts

@@ -11,6 +11,7 @@ import { compressToEncodedURIComponent, decompressFromEncodedURIComponent } from
 import { compress, decompress } from "./stock";
 import { compressToUint8Array, decompressFromUint8Array } from "./Uint8Array";
 import { compressToUTF16, decompressFromUTF16 } from "./UTF16";
+import { compressToCustom, decompressFromCustom } from "./custom";
 
 export default {
     _compress,
@@ -30,4 +31,7 @@ export default {
 
     compressToUTF16,
     decompressFromUTF16,
+
+    compressToCustom,
+    decompressFromCustom,
 };

tests/testValues.ts

@@ -118,3 +118,16 @@ export const test_tattooUint8Array = new Uint8Array([
 /** Known output for UTF16 compression */
 export const test_tattooUTF16 =
     "\u0462\u5C33\u414C\u0780\u7320\u1025\u6063\u0230\u3DBB\u51A0\u3496\u40F6\u3C26\u3A05K\u00C6\u01AC\u0870\u04F4\u7AA8\u00D0\u5731\u7DC5\u6D24\u0441\u25AE\u0934\u1E20\u5B71\u1070\u6CE0\u2930\u0093\u22A4\u2177\u1863\u152AV\u4D44\u54B3\u37F3\u4024\u2534\u456C\u0D3C\u7344\u18D2\u4702\u45C0\u0393\u36A4\u60B5\u486C\u5241\u282C\u4648\u2890\u1059\u3DA7\u55EA\u0FA0\u03C3\u4020\u555D\u2706\u4B8B\u2DCE\u492C\u0620\u0517\u31C2\u44F8\u6820\u3336\u0481\u1DF3\u6024\u3363\u5284\u01E8\u24BA\u4CF1\u15BC\u0A2A\u5B4B\u4749@\u7312\u2C61\u74D6\u0164\u00E1\u402E\u7606\u32B2\u08A9\u48F9\u394E\u6E25\u147C\u5F67\u2456\u4337\u5958\u5051\u78B4\u1D7C\u149A\u6DFA\u37E5\u4A8F\u1170\u1890\u2728\u1124\u1CD3\u26E9\u137B\u028C\u39C0\u31E0\u7D86\u1A28\u1F0D\u4022\u5440\u1738\u0F90\u218A\u1220\u0844\u7970\u7020\u0C7F\u2359\u20F6\u28B8\u43A1\u564E\u26B2\u6430\u7D08\u1CA2\u03F2\u3490\u39B0\u1364\u3C61\u28ED\u0323\u7044\u397B\u1661\u40D6\u1F36\u04FA\u1236\u15A6\u6758\u29FD\u35A5\u63A0\u64C6\u3430\u622B\u430C\u2F3F\u1249\u45B7\u3A2D\u01A8\u0092\u0A48\u6103\u1859\u14D9\u6907\u7256\u2635\u08C2\u1060\u5EB8\u5741\u498E\u3FB1\u00F3\u4029\u183E\u2520\u2020\u5A41\u4482\u5545\u1CF4\u57E0\u63A4\u2271\u0223\u01A0\u2856\u0CC6\u6054\u4D69\u55C6\u5931\u0B37\u16F2\u0408\u1704\u1B8F\u02E7\u1B8A\u4DAE\u1899\u4571\u0644\u3021\u6ACC\u08B7\u2A8B\u52A2\u2F31\u0361\u60BA\u1239\u2321\u6E05\u2590\u61B7\u2EA2\u73BF\u2700\u4467\u2152\u34E9\u7F0C\u0520\u18CB\u406A\u2E2C\u2A41\u7439\u1628\u38CA\u3497\u2D2C\u0D8C\u5897\u094E\u5DE2\u4634\u0D7F\u4F2C\u7D72\u0327\u63C1\u4040\u3C27\u48E5\u50D2\u1426\u570B\u3CFA\u366F\u4B80\u2474\u24F0\u5049\u6DAC\u734E\u00C0\u0A25\u3521\u06E3\u6CBE\u1129\u00A1\u684C\u6DBA\u5739\u02F1\u508E\u4D18\u2836\u28B9\u208C\u4872\u3676\u4622\u4C82\u2213\u734D\u03C2\u7042\u0679\u3B30\u0892\u1453\u63F9\u583F\u0DAB\u3A98\u1D20\u0A2A\u6E40\u0465\u0330i\u08A0\u28EC\u1807\u018B\u32A0\u6134\u26EC\u34F0\u06A4\u2068\u2202\u5C8A\u2834\u6283\u260C\u0A0E\u2C2C\u5CF8\u1D2F\u4240\u7320\u21AA\u283E\u19D4\u0B34\u2380\u6921\u22B0\u1537\u6058\u7F6C\u52F4\u1E2D\u68C9\u0829\u51D7\u0D22\u124D\u0AEB\u7118\u1DCE\u2348\u69AE\u40D2\u1464\u0020\u0020";
+
+/** A longer lorem ipsum text */
+export const test_complicated = `Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.   
+    Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.   
+    Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.   
+    Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.   
+    Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis.   
+    At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, At accusam aliquyam diam diam dolore dolores duo eirmod eos erat, et nonumy sed tempor et et invidunt justo labore Stet clita ea et gubergren, kasd magna no rebum. sanctus sea sed takimata ut vero voluptua. est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat.   
+    Consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus.   
+    Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.   
+    Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.   
+    Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.   
+    Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo.`;