mirror of
https://github.com/gchq/CyberChef.git
synced 2024-09-07 12:11:35 +02:00
165 lines
5.2 KiB
JavaScript
165 lines
5.2 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";
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import {fromHex} from "../lib/Hex";
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/**
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* From Hexdump operation
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*/
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class FromHexdump extends Operation {
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/**
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* FromHexdump constructor
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*/
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constructor() {
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super();
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this.name = "From Hexdump";
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this.module = "Default";
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this.description = "Attempts to convert a hexdump back into raw data. This operation supports many different hexdump variations, but probably not all. Make sure you verify that the data it gives you is correct before continuing analysis.";
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this.infoURL = "https://wikipedia.org/wiki/Hex_dump";
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this.inputType = "string";
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this.outputType = "byteArray";
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this.args = [];
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this.patterns = [
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{
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match: "^(?:(?:[\\dA-F]{4,16}h?:?)?[ \\t]*((?:[\\dA-F]{2} ){1,8}(?:[ \\t]|[\\dA-F]{2}-)(?:[\\dA-F]{2} ){1,8}|(?:[\\dA-F]{4} )*[\\dA-F]{4}|(?:[\\dA-F]{2} )*[\\dA-F]{2})[^\\n]*\\n?){2,}$",
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flags: "i",
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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 {string} 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 output = [],
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regex = /^\s*(?:[\dA-F]{4,16}h?:?)?[ \t]+((?:[\dA-F]{2} ){1,8}(?:[ \t]|[\dA-F]{2}-)(?:[\dA-F]{2} ){1,8}|(?:[\dA-F]{4} )*[\dA-F]{4}|(?:[\dA-F]{2} )*[\dA-F]{2})/igm;
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let block, line;
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while ((block = regex.exec(input))) {
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line = fromHex(block[1].replace(/-/g, " "));
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for (let i = 0; i < line.length; i++) {
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output.push(line[i]);
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}
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}
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// Is this a CyberChef hexdump or is it from a different tool?
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const width = input.indexOf("\n");
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const w = (width - 13) / 4;
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// w should be the specified width of the hexdump and therefore a round number
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if (Math.floor(w) !== w || input.indexOf("\r") !== -1 || output.indexOf(13) !== -1) {
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if (ENVIRONMENT_IS_WORKER()) self.setOption("attemptHighlight", false);
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}
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return output;
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}
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/**
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* Highlight From Hexdump
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*
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* @param {Object[]} pos
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* @param {number} pos[].start
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* @param {number} pos[].end
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* @param {Object[]} args
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* @returns {Object[]} pos
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*/
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highlight(pos, args) {
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const w = args[0] || 16;
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const width = 14 + (w*4);
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let line = Math.floor(pos[0].start / width);
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let offset = pos[0].start % width;
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if (offset < 10) { // In line number section
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pos[0].start = line*w;
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} else if (offset > 10+(w*3)) { // In ASCII section
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pos[0].start = (line+1)*w;
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} else { // In byte section
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pos[0].start = line*w + Math.floor((offset-10)/3);
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}
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line = Math.floor(pos[0].end / width);
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offset = pos[0].end % width;
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if (offset < 10) { // In line number section
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pos[0].end = line*w;
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} else if (offset > 10+(w*3)) { // In ASCII section
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pos[0].end = (line+1)*w;
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} else { // In byte section
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pos[0].end = line*w + Math.ceil((offset-10)/3);
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}
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return pos;
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}
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/**
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* Highlight From Hexdump in reverse
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*
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* @param {Object[]} pos
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* @param {number} pos[].start
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* @param {number} pos[].end
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* @param {Object[]} args
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* @returns {Object[]} pos
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*/
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highlightReverse(pos, args) {
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// Calculate overall selection
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const w = args[0] || 16,
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width = 14 + (w*4);
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let line = Math.floor(pos[0].start / w),
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offset = pos[0].start % w,
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start = 0,
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end = 0;
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pos[0].start = line*width + 10 + offset*3;
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line = Math.floor(pos[0].end / w);
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offset = pos[0].end % w;
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if (offset === 0) {
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line--;
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offset = w;
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}
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pos[0].end = line*width + 10 + offset*3 - 1;
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// Set up multiple selections for bytes
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let startLineNum = Math.floor(pos[0].start / width);
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const endLineNum = Math.floor(pos[0].end / width);
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if (startLineNum === endLineNum) {
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pos.push(pos[0]);
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} else {
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start = pos[0].start;
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end = (startLineNum+1) * width - w - 5;
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pos.push({ start: start, end: end });
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while (end < pos[0].end) {
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startLineNum++;
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start = startLineNum * width + 10;
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end = (startLineNum+1) * width - w - 5;
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if (end > pos[0].end) end = pos[0].end;
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pos.push({ start: start, end: end });
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}
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}
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// Set up multiple selections for ASCII
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const len = pos.length;
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let lineNum = 0;
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start = 0;
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end = 0;
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for (let i = 1; i < len; i++) {
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lineNum = Math.floor(pos[i].start / width);
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start = (((pos[i].start - (lineNum * width)) - 10) / 3) + (width - w -2) + (lineNum * width);
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end = (((pos[i].end + 1 - (lineNum * width)) - 10) / 3) + (width - w -2) + (lineNum * width);
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pos.push({ start: start, end: end });
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}
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return pos;
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}
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}
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export default FromHexdump;
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