mirror of https://github.com/gchq/CyberChef.git
112 lines
2.5 KiB
JavaScript
112 lines
2.5 KiB
JavaScript
/**
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* Hexadecimal functions.
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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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import Utils from "../Utils";
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/**
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* Convert a byte array into a hex string.
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*
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* @param {byteArray|Uint8Array|ArrayBuffer} data
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* @param {string} [delim=" "]
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* @param {number} [padding=2]
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* @returns {string}
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*
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* @example
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* // returns "0a 14 1e"
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* toHex([10,20,30]);
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*
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* // returns "0a:14:1e"
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* toHex([10,20,30], ":");
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*/
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export function toHex(data, delim=" ", padding=2) {
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if (!data) return "";
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if (data instanceof ArrayBuffer) data = new Uint8Array(data);
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let output = "";
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for (let i = 0; i < data.length; i++) {
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output += data[i].toString(16).padStart(padding, "0") + delim;
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}
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// Add \x or 0x to beginning
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if (delim === "0x") output = "0x" + output;
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if (delim === "\\x") output = "\\x" + output;
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if (delim.length)
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return output.slice(0, -delim.length);
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else
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return output;
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}
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/**
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* Convert a byte array into a hex string as efficiently as possible with no options.
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*
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* @param {byteArray|Uint8Array|ArrayBuffer} data
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* @returns {string}
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*
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* @example
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* // returns "0a141e"
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* toHex([10,20,30]);
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*/
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export function toHexFast(data) {
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if (!data) return "";
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if (data instanceof ArrayBuffer) data = new Uint8Array(data);
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const output = [];
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for (let i = 0; i < data.length; i++) {
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output.push((data[i] >>> 4).toString(16));
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output.push((data[i] & 0x0f).toString(16));
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}
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return output.join("");
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}
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/**
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* Convert a hex string into a byte array.
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*
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* @param {string} data
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* @param {string} [delim]
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* @param {number} [byteLen=2]
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* @returns {byteArray}
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*
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* @example
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* // returns [10,20,30]
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* fromHex("0a 14 1e");
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*
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* // returns [10,20,30]
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* fromHex("0a:14:1e", "Colon");
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*/
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export function fromHex(data, delim="Auto", byteLen=2) {
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if (delim !== "None") {
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const delimRegex = delim === "Auto" ? /[^a-f\d]/gi : Utils.regexRep(delim);
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data = data.replace(delimRegex, "");
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}
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const output = [];
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for (let i = 0; i < data.length; i += byteLen) {
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output.push(parseInt(data.substr(i, byteLen), 16));
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}
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return output;
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}
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/**
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* To Hexadecimal delimiters.
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*/
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export const TO_HEX_DELIM_OPTIONS = ["Space", "Percent", "Comma", "Semi-colon", "Colon", "Line feed", "CRLF", "0x", "\\x", "None"];
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/**
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* From Hexadecimal delimiters.
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*/
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export const FROM_HEX_DELIM_OPTIONS = ["Auto"].concat(TO_HEX_DELIM_OPTIONS);
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