mirror of https://github.com/gchq/CyberChef.git
68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
/**
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* @author sg5506844 [sg5506844@gmail.com]
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* @copyright Crown Copyright 2021
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* @license Apache-2.0
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*/
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import { base92Chr } from "../lib/Base92.mjs";
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import Operation from "../Operation.mjs";
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/**
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* To Base92 operation
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*/
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class ToBase92 extends Operation {
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/**
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* ToBase92 constructor
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*/
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constructor() {
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super();
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this.name = "To Base92";
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this.module = "Default";
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this.description = "Base92 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers.";
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this.infoURL = "https://wikipedia.org/wiki/List_of_numeral_systems";
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this.inputType = "string";
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this.outputType = "byteArray";
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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 res = [];
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let bitString = "";
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while (input.length > 0) {
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while (bitString.length < 13 && input.length > 0) {
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bitString += input[0].charCodeAt(0).toString(2).padStart(8, "0");
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input = input.slice(1);
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}
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if (bitString.length < 13)
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break;
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const i = parseInt(bitString.slice(0, 13), 2);
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res.push(base92Chr(Math.floor(i / 91)));
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res.push(base92Chr(i % 91));
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bitString = bitString.slice(13);
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}
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if (bitString.length > 0) {
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if (bitString.length < 7) {
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bitString = bitString.padEnd(6, "0");
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res.push(base92Chr(parseInt(bitString, 2)));
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} else {
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bitString = bitString.padEnd(13, "0");
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const i = parseInt(bitString.slice(0, 13), 2);
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res.push(base92Chr(Math.floor(i / 91)));
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res.push(base92Chr(i % 91));
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}
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}
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return res;
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}
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}
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export default ToBase92;
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