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 {INFLATE_BUFFER_TYPE} from "../lib/Zlib.mjs";
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import zlibAndGzip from "zlibjs/bin/zlib_and_gzip.min.js";
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const Zlib = zlibAndGzip.Zlib;
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const ZLIB_BUFFER_TYPE_LOOKUP = {
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"Adaptive": Zlib.Inflate.BufferType.ADAPTIVE,
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"Block": Zlib.Inflate.BufferType.BLOCK,
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};
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/**
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* Zlib Inflate operation
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*/
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class ZlibInflate extends Operation {
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/**
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* ZlibInflate constructor
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*/
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constructor() {
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super();
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this.name = "Zlib Inflate";
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this.module = "Compression";
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this.description = "Decompresses data which has been compressed using the deflate algorithm with zlib headers.";
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this.infoURL = "https://wikipedia.org/wiki/Zlib";
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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: "Start index",
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type: "number",
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value: 0
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},
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{
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name: "Initial output buffer size",
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type: "number",
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value: 0
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},
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{
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name: "Buffer expansion type",
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type: "option",
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value: INFLATE_BUFFER_TYPE
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},
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{
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name: "Resize buffer after decompression",
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type: "boolean",
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value: false
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},
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{
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name: "Verify result",
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type: "boolean",
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value: false
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}
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];
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this.checks = [
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{
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pattern: "^\\x78(\\x01|\\x9c|\\xda|\\x5e)",
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flags: "",
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args: [0, 0, "Adaptive", false, 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 inflate = new Zlib.Inflate(new Uint8Array(input), {
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index: args[0],
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bufferSize: args[1],
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bufferType: ZLIB_BUFFER_TYPE_LOOKUP[args[2]],
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resize: args[3],
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verify: args[4]
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});
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return new Uint8Array(inflate.decompress()).buffer;
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}
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}
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export default ZlibInflate;
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