mirror of https://github.com/gchq/CyberChef.git
68 lines
1.8 KiB
JavaScript
68 lines
1.8 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 Utils from "../Utils";
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import {fromHex} from "../lib/Hex";
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/**
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* From Hex Content operation
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*/
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class FromHexContent extends Operation {
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/**
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* FromHexContent constructor
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*/
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constructor() {
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super();
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this.name = "From Hex Content";
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this.module = "Default";
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this.description = "Translates hexadecimal bytes in text back to raw bytes. This format is used by SNORT for representing hex within ASCII text.<br><br>e.g. <code>foo|3d|bar</code> becomes <code>foo=bar</code>.";
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this.infoURL = "http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node32.html#SECTION00451000000000000000";
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this.inputType = "string";
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this.outputType = "byteArray";
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this.args = [];
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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 regex = /\|([a-f\d ]{2,})\|/gi,
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output = [];
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let m, i = 0;
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while ((m = regex.exec(input))) {
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// Add up to match
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for (; i < m.index;)
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output.push(Utils.ord(input[i++]));
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// Add match
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const bytes = fromHex(m[1]);
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if (bytes) {
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for (let a = 0; a < bytes.length;)
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output.push(bytes[a++]);
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} else {
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// Not valid hex, print as normal
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for (; i < regex.lastIndex;)
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output.push(Utils.ord(input[i++]));
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}
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i = regex.lastIndex;
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}
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// Add all after final match
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for (; i < input.length;)
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output.push(Utils.ord(input[i++]));
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return output;
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}
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}
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export default FromHexContent;
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