mirror of https://github.com/gchq/CyberChef.git
74 lines
2.3 KiB
JavaScript
74 lines
2.3 KiB
JavaScript
/**
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* @author Matt C [me@mitt.dev]
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import Bzip2 from "libbzip2-wasm";
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import { isWorkerEnvironment } from "../Utils.mjs";
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/**
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* Bzip2 Compress operation
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*/
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class Bzip2Compress extends Operation {
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/**
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* Bzip2Compress constructor
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*/
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constructor() {
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super();
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this.name = "Bzip2 Compress";
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this.module = "Compression";
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this.description = "Bzip2 is a compression library developed by Julian Seward (of GHC fame) that uses the Burrows-Wheeler algorithm. It only supports compressing single files and its compression is slow, however is more effective than Deflate (.gz & .zip).";
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this.infoURL = "https://wikipedia.org/wiki/Bzip2";
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this.inputType = "ArrayBuffer";
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this.outputType = "ArrayBuffer";
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this.args = [
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{
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name: "Block size (100s of kb)",
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type: "number",
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value: 9,
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min: 1,
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max: 9
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},
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{
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name: "Work factor",
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type: "number",
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value: 30
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}
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];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {File}
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*/
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run(input, args) {
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const [blockSize, workFactor] = args;
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if (input.byteLength <= 0) {
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throw new OperationError("Please provide an input.");
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}
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if (isWorkerEnvironment()) self.sendStatusMessage("Loading Bzip2...");
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return new Promise((resolve, reject) => {
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Bzip2().then(bzip2 => {
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if (isWorkerEnvironment()) self.sendStatusMessage("Compressing data...");
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const inpArray = new Uint8Array(input);
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const bzip2cc = bzip2.compressBZ2(inpArray, blockSize, workFactor);
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if (bzip2cc.error !== 0) {
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reject(new OperationError(bzip2cc.error_msg));
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} else {
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const output = bzip2cc.output;
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resolve(output.buffer.slice(output.byteOffset, output.byteLength + output.byteOffset));
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}
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});
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});
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}
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}
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export default Bzip2Compress;
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