Fix issue #44, make decompress work in NodeJS (use Worker only where possible).

Author: codedread

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.1.7] - 2023-12-11
+
+### Changed
+
+- decompress: Allow unarchiving in Node.
+
 ## [1.1.6] - 2023-10-25
 
 ### Changed

README.md

@@ -6,21 +6,25 @@
 
 A set of dependency-free JavaScript modules to handle binary data in JS (using Typed Arrays).  Includes:
 
-  * bitjs/archive: Unarchiving files (unzip, unrar, untar) in the browser, implemented as Web Workers and allowing progressively unarchiving while streaming.
-  * bitjs/codecs: Get the codec info of media containers in a ISO RFC6381 MIME type string
+  * bitjs/archive: Unarchiving files (unzip, unrar, untar) in JavaScript,
+    implemented as Web Workers where supported, and allowing progressive
+    unarchiving while streaming.
+  * bitjs/codecs: Get the codec info of media containers in a ISO RFC6381
+    MIME type string
   * bitjs/file: Detect the type of file from its binary signature.
   * bitjs/image: Conversion of WebP images to PNG or JPEG.
-  * bitjs/io: Low-level classes for interpreting binary data (BitStream, ByteStream).  For example, reading or peeking at N bits at a time.
+  * bitjs/io: Low-level classes for interpreting binary data (BitStream
+    ByteStream).  For example, reading or peeking at N bits at a time.
 
 ## Installation
 
 Install it using your favourite package manager, the package is registered under `@codedread/bitjs`. 
 ```bash
-$ npm install @codedread/bitjs
+npm install @codedread/bitjs
 ```
 or
 ```bash
-$ yarn add @codedread/bitjs
+yarn add @codedread/bitjs
 ```
 
 ### Using in Node
@@ -44,7 +48,7 @@ const { getFullMIMEString } = await import('@codedread/bitjs');
 
 ### bitjs.archive
 
-This package includes objects for unarchiving binary data in popular archive formats (zip, rar, tar) providing unzip, unrar and untar capabilities via JavaScript in the browser. A prototype version of a compressor that creates Zip files is also present. The decompression/compression actually happens inside a Web Worker.
+This package includes objects for unarchiving binary data in popular archive formats (zip, rar, tar) providing unzip, unrar and untar capabilities via JavaScript in the browser. A prototype version of a compressor that creates Zip files is also present. The decompression/compression actually happens inside a Web Worker, when the runtime supports it (browsers, deno).
 
 #### Decompressing
 
@@ -88,6 +92,24 @@ unzipper.update(anArrayBufferWithMoreBytes);
 unzipper.update(anArrayBufferWithYetMoreBytes);
 ```
 
+##### A NodeJS Example
+
+```javascript
+  import * as fs from 'fs';
+  import { getUnarchiver } from './archive/decompress.js';
+
+  const nodeBuffer = fs.readFileSync('comic.cbz');
+  const ab = nodeBuffer.buffer.slice(nodeBuffer.byteOffset, nodeBuffer.byteOffset + nodeBuffer.length);
+  const unarchiver = getUnarchiver(ab, { pathToBitJS: './' });
+  unarchiver.addEventListener('progress', () => process.stdout.write('.'));
+  unarchiver.addEventListener('extract', (evt) => {
+    const extractedFile = evt.unarchivedFile;
+    console.log(`${extractedFile.filename} (${extractedFile.fileData.byteLength} bytes)`);
+  });
+  unarchiver.addEventListener('finish', () => console.log(`Done!`));
+  unarchiver.start();
+```
+
 #### Compressing
 
 The Zipper only supports creating zip files without compression (store only) for now. The interface

archive/decompress-internal.js

@@ -20,13 +20,6 @@ import { findMimeType } from '../file/sniffer.js';
  * @property {Uint8Array} fileData
  */
 
-/**
- * An enum for threading mode. Currently supporting only WebWorkers.
- */
-export const ThreadingMode = {
-  WEB_WORKER: 'WEB_WORKER',
-}
-
 /**
  * @typedef UnarchiverOptions
  * @property {string} pathToBitJS The path to the bitjs folder.
@@ -232,7 +225,7 @@ export class UnzipperInternal extends Unarchiver {
   }
 
   getMIMEType() { return 'application/zip'; }
-  getScriptFileName() { return 'archive/unzip.js'; }
+  getScriptFileName() { return './unzip.js'; }
 }
 
 export class UnrarrerInternal extends Unarchiver {
@@ -241,7 +234,7 @@ export class UnrarrerInternal extends Unarchiver {
   }
 
   getMIMEType() { return 'application/x-rar-compressed'; }
-  getScriptFileName() { return 'archive/unrar.js'; }
+  getScriptFileName() { return './unrar.js'; }
 }
 
 export class UntarrerInternal extends Unarchiver {
@@ -250,7 +243,7 @@ export class UntarrerInternal extends Unarchiver {
   }
 
   getMIMEType() { return 'application/x-tar'; }
-  getScriptFileName() { return 'archive/untar.js'; };
+  getScriptFileName() { return './untar.js'; };
 }
 
 /**

archive/decompress.js

@@ -28,9 +28,9 @@ export {
 } 
 
 /**
-* All extracted files returned by an Unarchiver will implement
-* the following interface:
-*/
+ * All extracted files returned by an Unarchiver will implement
+ * the following interface:
+ */
 
 /**
  * @typedef UnarchivedFile
@@ -43,23 +43,27 @@ export {
  */
 
 /**
- * Creates a WebWorker with the given decompressor implementation (e.g. unzip.js)
- * and transfers a MessagePort for communication. Returns a Promise to the Worker.
+ * Connects the MessagePort to the unarchiver implementation (e.g. unzip.js). If Workers exist
+ * (e.g. web browsers or deno), imports the implementation inside a Web Worker. Otherwise, it
+ * dynamically imports the implementation inside the current JS context.
+ * The MessagePort is used for communication between host and implementation.
  * @param {string} pathToBitJS The path to the bitjs folder.
- * @param {string} implFilename The decompressor implementation filename
- *     relative to this path (e.g. './unzip.js').
- * @param {MessagePort} implPort The MessagePort to connect to the decompressor
- *     implementation.
- * @returns {Promise<*>} Returns a Promise that resolves to the Worker object.
+ * @param {string} implFilename The decompressor implementation filename relative to this path
+ *     (e.g. './unzip.js').
+ * @param {MessagePort} implPort The MessagePort to connect to the decompressor implementation.
+ * @returns {Promise<void>} The Promise resolves once the ports are connected.
  */
-const connectPortFn = (pathToBitJS, implFilename, implPort) => {
-  return new Promise((resolve, reject) => {
-    const worker = new Worker(pathToBitJS + 'archive/unarchiver-webworker.js', {
-      type: 'module'
+const connectPortFn = async (pathToBitJS, implFilename, implPort) => {
+  if (typeof Worker === 'undefined') {
+    return import(`${implFilename}`).then(implModule => {
+      implModule.connect(implPort)
     });
+  }
 
-    worker.postMessage({ implSrc: (pathToBitJS + implFilename), }, [implPort]);
-    resolve(worker);
+  return new Promise((resolve, reject) => {
+    const worker = new Worker(pathToBitJS + 'archive/unarchiver-webworker.js', { type: 'module' });
+    worker.postMessage({ implSrc: implFilename }, [implPort]);
+    resolve();
   });
 };
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@codedread/bitjs",
-  "version": "1.1.6",
+  "version": "1.1.7",
   "description": "Binary Tools for JavaScript",
   "homepage": "https://github.com/codedread/bitjs",
   "author": "Jeff Schiller",