mirror of https://github.com/gchq/CyberChef.git
90 lines
2.3 KiB
JavaScript
90 lines
2.3 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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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 {COMPRESSION_TYPE, ZLIB_COMPRESSION_TYPE_LOOKUP} from "../lib/Zlib.mjs";
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import gzip from "zlibjs/bin/gzip.min.js";
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const Zlib = gzip.Zlib;
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/**
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* Gzip operation
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*/
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class Gzip extends Operation {
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/**
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* Gzip constructor
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*/
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constructor() {
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super();
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this.name = "Gzip";
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this.module = "Compression";
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this.description = "Compresses data using the deflate algorithm with gzip headers.";
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this.infoURL = "https://wikipedia.org/wiki/Gzip";
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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: "Compression type",
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type: "option",
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value: COMPRESSION_TYPE
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},
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{
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name: "Filename (optional)",
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type: "string",
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value: ""
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},
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{
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name: "Comment (optional)",
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type: "string",
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value: ""
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},
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{
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name: "Include file checksum",
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type: "boolean",
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value: false
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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 {ArrayBuffer}
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*/
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run(input, args) {
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const filename = args[1],
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comment = args[2],
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options = {
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deflateOptions: {
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compressionType: ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]]
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},
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flags: {
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fhcrc: args[3]
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}
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};
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if (filename.length) {
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options.flags.fname = true;
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options.filename = filename;
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}
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if (comment.length) {
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options.flags.comment = true;
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options.comment = comment;
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}
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const gzipObj = new Zlib.Gzip(new Uint8Array(input), options);
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const compressed = new Uint8Array(gzipObj.compress());
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if (options.flags.comment && !(compressed[3] & 0x10)) {
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compressed[3] |= 0x10;
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}
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return compressed.buffer;
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}
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}
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export default Gzip;
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