mirror of https://github.com/gchq/CyberChef.git
102 lines
2.2 KiB
JavaScript
Executable File
102 lines
2.2 KiB
JavaScript
Executable File
import Utils from "../Utils.js";
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/**
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* Unicode operations.
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*
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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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* @namespace
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*/
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const Unicode = {
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/**
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* @constant
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* @default
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*/
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PREFIXES: ["\\u", "%u", "U+"],
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/**
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* Unescape Unicode Characters operation.
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*
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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runUnescape: function(input, args) {
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let prefix = Unicode._prefixToRegex[args[0]],
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regex = new RegExp(prefix+"([a-f\\d]{4})", "ig"),
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output = "",
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m,
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i = 0;
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while ((m = regex.exec(input))) {
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// Add up to match
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output += input.slice(i, m.index);
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i = m.index;
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// Add match
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output += Utils.chr(parseInt(m[1], 16));
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i = regex.lastIndex;
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}
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// Add all after final match
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output += input.slice(i, input.length);
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return output;
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},
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/**
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* Escape Unicode Characters operation.
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*
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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runEscape: function(input, args) {
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const regexWhitelist = /[ -~]/i,
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prefix = args[0],
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encodeAll = args[1],
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padding = args[2],
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uppercaseHex = args[3];
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let output = "",
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character = "";
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for (let i = 0; i < input.length; i++) {
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character = input[i];
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if (!encodeAll && regexWhitelist.test(character)) {
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// It’s a printable ASCII character so don’t escape it.
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output += character;
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continue;
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}
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let cp = character.codePointAt(0).toString(16);
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if (uppercaseHex) cp = cp.toUpperCase();
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output += prefix + cp.padStart(padding, "0");
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}
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return output;
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},
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/**
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* Lookup table to add prefixes to unicode delimiters so that they can be used in a regex.
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*
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* @private
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* @constant
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*/
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_prefixToRegex: {
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"\\u": "\\\\u",
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"%u": "%u",
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"U+": "U\\+"
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},
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};
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export default Unicode;
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