mirror of https://github.com/gchq/CyberChef.git
140 lines
4.1 KiB
JavaScript
140 lines
4.1 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";
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import Utils from "../Utils";
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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 = "byteArray";
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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.patterns = [
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{
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"match": "^.{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 {byteArray} 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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const Stream = function(input) {
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this.bytes = input;
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this.position = 0;
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};
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Stream.prototype.getBytes = function(bytesToGet) {
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const newPosition = this.position + bytesToGet;
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const bytes = this.bytes.slice(this.position, newPosition);
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this.position = newPosition;
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return bytes;
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};
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Stream.prototype.readString = function(numBytes) {
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let result = "";
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for (let i = this.position; i < this.position + numBytes; i++) {
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const currentByte = this.bytes[i];
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if (currentByte === 0) break;
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result += String.fromCharCode(currentByte);
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}
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this.position += numBytes;
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return result;
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};
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Stream.prototype.readInt = function(numBytes, base) {
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const string = this.readString(numBytes);
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return parseInt(string, base);
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};
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Stream.prototype.hasMore = function() {
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return this.position < this.bytes.length;
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};
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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 * stream.readInt(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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