mirror of https://github.com/gchq/CyberChef.git
45 lines
987 B
JavaScript
45 lines
987 B
JavaScript
/**
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* Base92 resources.
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*
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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 OperationError from "../errors/OperationError.mjs";
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/**
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* Base92 alphabet char
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*
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* @param {number} val
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* @returns {number}
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*/
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export function base92Chr(val) {
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if (val < 0 || val >= 91) {
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throw new OperationError("Invalid value");
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}
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if (val === 0)
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return "!".charCodeAt(0);
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else if (val <= 61)
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return "#".charCodeAt(0) + val - 1;
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else
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return "a".charCodeAt(0) + val - 62;
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}
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/**
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* Base92 alphabet ord
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*
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* @param {string} val
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* @returns {number}
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*/
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export function base92Ord(val) {
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if (val === "!")
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return 0;
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else if ("#" <= val && val <= "_")
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return val.charCodeAt(0) - "#".charCodeAt(0) + 1;
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else if ("a" <= val && val <= "}")
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return val.charCodeAt(0) - "a".charCodeAt(0) + 62;
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throw new OperationError(`${val} is not a base92 character`);
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}
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