mirror of https://github.com/gchq/CyberChef.git
110 lines
3.2 KiB
JavaScript
110 lines
3.2 KiB
JavaScript
/**
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* @author tlwr [toby@toby.codes]
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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 Utils from "../Utils.mjs";
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import Stream from "../lib/Stream.mjs";
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/**
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* Untar operation
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*/
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class Untar extends Operation {
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/**
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* Untar constructor
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*/
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constructor() {
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super();
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this.name = "Untar";
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this.module = "Compression";
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this.description = "Unpacks a tarball and displays it per file.";
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this.infoURL = "https://wikipedia.org/wiki/Tar_(computing)";
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this.inputType = "ArrayBuffer";
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this.outputType = "List<File>";
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this.presentType = "html";
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this.args = [];
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this.checks = [
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{
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"pattern": "^.{257}\\x75\\x73\\x74\\x61\\x72",
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"flags": "",
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"args": []
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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 {List<File>}
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*/
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run(input, args) {
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input = new Uint8Array(input);
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const stream = new Stream(input),
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files = [];
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while (stream.hasMore()) {
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const dataPosition = stream.position + 512;
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const file = {
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fileName: stream.readString(100),
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fileMode: stream.readString(8),
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ownerUID: stream.readString(8),
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ownerGID: stream.readString(8),
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size: parseInt(stream.readString(12), 8), // Octal
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lastModTime: new Date(1000 * parseInt(stream.readString(12), 8)), // Octal
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checksum: stream.readString(8),
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type: stream.readString(1),
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linkedFileName: stream.readString(100),
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USTARFormat: stream.readString(6).indexOf("ustar") >= 0,
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};
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if (file.USTARFormat) {
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file.version = stream.readString(2);
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file.ownerUserName = stream.readString(32);
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file.ownerGroupName = stream.readString(32);
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file.deviceMajor = stream.readString(8);
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file.deviceMinor = stream.readString(8);
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file.filenamePrefix = stream.readString(155);
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}
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stream.position = dataPosition;
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if (file.type === "0") {
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// File
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let endPosition = stream.position + file.size;
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if (file.size % 512 !== 0) {
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endPosition += 512 - (file.size % 512);
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}
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file.bytes = stream.getBytes(file.size);
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files.push(new File([new Uint8Array(file.bytes)], file.fileName));
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stream.position = endPosition;
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} else if (file.type === "5") {
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// Directory
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files.push(new File([new Uint8Array(file.bytes)], file.fileName));
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} else {
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// Symlink or empty bytes
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}
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}
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return files;
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}
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/**
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* Displays the files in HTML for web apps.
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*
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* @param {File[]} files
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* @returns {html}
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*/
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async present(files) {
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return await Utils.displayFilesAsHTML(files);
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}
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}
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export default Untar;
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