mirror of https://github.com/gchq/CyberChef.git
141 lines
4.4 KiB
JavaScript
141 lines
4.4 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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* Tar operation
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*/
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class Tar extends Operation {
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/**
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* Tar constructor
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*/
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constructor() {
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super();
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this.name = "Tar";
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this.module = "Compression";
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this.description = "Packs the input into a tarball.<br><br>No support for multiple files at this time.";
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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 = "File";
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this.args = [
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{
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"name": "Filename",
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"type": "string",
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"value": "file.txt"
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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 {byteArray}
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*/
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run(input, args) {
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const Tarball = function() {
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this.bytes = new Array(512);
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this.position = 0;
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};
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Tarball.prototype.addEmptyBlock = function() {
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const filler = new Array(512);
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filler.fill(0);
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this.bytes = this.bytes.concat(filler);
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};
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Tarball.prototype.writeBytes = function(bytes) {
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const self = this;
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if (this.position + bytes.length > this.bytes.length) {
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this.addEmptyBlock();
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}
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Array.prototype.forEach.call(bytes, function(b, i) {
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if (typeof b.charCodeAt !== "undefined") {
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b = b.charCodeAt();
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}
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self.bytes[self.position] = b;
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self.position += 1;
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});
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};
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Tarball.prototype.writeEndBlocks = function() {
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const numEmptyBlocks = 2;
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for (let i = 0; i < numEmptyBlocks; i++) {
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this.addEmptyBlock();
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}
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};
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const fileSize = input.length.toString(8).padStart(11, "0");
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const currentUnixTimestamp = Math.floor(Date.now() / 1000);
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const lastModTime = currentUnixTimestamp.toString(8).padStart(11, "0");
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const file = {
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fileName: Utils.padBytesRight(args[0], 100),
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fileMode: Utils.padBytesRight("0000664", 8),
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ownerUID: Utils.padBytesRight("0", 8),
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ownerGID: Utils.padBytesRight("0", 8),
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size: Utils.padBytesRight(fileSize, 12),
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lastModTime: Utils.padBytesRight(lastModTime, 12),
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checksum: " ",
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type: "0",
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linkedFileName: Utils.padBytesRight("", 100),
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USTARFormat: Utils.padBytesRight("ustar", 6),
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version: "00",
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ownerUserName: Utils.padBytesRight("", 32),
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ownerGroupName: Utils.padBytesRight("", 32),
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deviceMajor: Utils.padBytesRight("", 8),
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deviceMinor: Utils.padBytesRight("", 8),
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fileNamePrefix: Utils.padBytesRight("", 155),
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};
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let checksum = 0;
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for (const key in file) {
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const bytes = file[key];
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Array.prototype.forEach.call(bytes, function(b) {
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if (typeof b.charCodeAt !== "undefined") {
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checksum += b.charCodeAt();
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} else {
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checksum += b;
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}
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});
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}
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checksum = Utils.padBytesRight(checksum.toString(8).padStart(7, "0"), 8);
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file.checksum = checksum;
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const tarball = new Tarball();
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tarball.writeBytes(file.fileName);
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tarball.writeBytes(file.fileMode);
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tarball.writeBytes(file.ownerUID);
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tarball.writeBytes(file.ownerGID);
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tarball.writeBytes(file.size);
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tarball.writeBytes(file.lastModTime);
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tarball.writeBytes(file.checksum);
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tarball.writeBytes(file.type);
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tarball.writeBytes(file.linkedFileName);
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tarball.writeBytes(file.USTARFormat);
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tarball.writeBytes(file.version);
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tarball.writeBytes(file.ownerUserName);
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tarball.writeBytes(file.ownerGroupName);
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tarball.writeBytes(file.deviceMajor);
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tarball.writeBytes(file.deviceMinor);
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tarball.writeBytes(file.fileNamePrefix);
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tarball.writeBytes(Utils.padBytesRight("", 12));
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tarball.writeBytes(input);
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tarball.writeEndBlocks();
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return new File([new Uint8Array(tarball.bytes)], args[0]);
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}
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}
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export default Tar;
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