mirror of https://github.com/gchq/CyberChef.git
86 lines
2.3 KiB
JavaScript
86 lines
2.3 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.mjs";
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import Utils from "../Utils.mjs";
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import { DELIM_OPTIONS } from "../lib/Delim.mjs";
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import { isWorkerEnvironment } from "../Utils.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* From Charcode operation
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*/
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class FromCharcode extends Operation {
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/**
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* FromCharcode constructor
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*/
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constructor() {
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super();
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this.name = "From Charcode";
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this.module = "Default";
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this.description = "Converts unicode character codes back into text.<br><br>e.g. <code>0393 03b5 03b9 03ac 20 03c3 03bf 03c5</code> becomes <code>Γειά σου</code>";
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this.infoURL = "https://wikipedia.org/wiki/Plane_(Unicode)";
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this.inputType = "string";
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this.outputType = "ArrayBuffer";
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this.args = [
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{
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"name": "Delimiter",
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"type": "option",
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"value": DELIM_OPTIONS
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},
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{
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"name": "Base",
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"type": "number",
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"value": 16
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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 {ArrayBuffer}
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*
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* @throws {OperationError} if base out of range
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*/
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run(input, args) {
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const delim = Utils.charRep(args[0] || "Space"),
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base = args[1];
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let bites = input.split(delim),
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i = 0;
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if (base < 2 || base > 36) {
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throw new OperationError("Error: Base argument must be between 2 and 36");
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}
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if (input.length === 0) {
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return new ArrayBuffer;
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}
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if (base !== 16 && isWorkerEnvironment()) self.setOption("attemptHighlight", false);
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// Split into groups of 2 if the whole string is concatenated and
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// too long to be a single character
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if (bites.length === 1 && input.length > 17) {
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bites = [];
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for (i = 0; i < input.length; i += 2) {
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bites.push(input.slice(i, i+2));
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}
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}
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let latin1 = "";
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for (i = 0; i < bites.length; i++) {
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latin1 += Utils.chr(parseInt(bites[i], base));
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}
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return Utils.strToArrayBuffer(latin1);
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}
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}
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export default FromCharcode;
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