mirror of https://github.com/gchq/CyberChef.git
70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
/**
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* Some parts taken from mimelib (http://github.com/andris9/mimelib)
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* @author Andris Reinman
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* @license MIT
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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 Operation from "../Operation";
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/**
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* From Quoted Printable operation
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*/
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class FromQuotedPrintable extends Operation {
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/**
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* FromQuotedPrintable constructor
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*/
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constructor() {
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super();
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this.name = "From Quoted Printable";
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this.module = "Default";
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this.description = "Converts QP-encoded text back to standard text.";
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this.infoURL = "https://wikipedia.org/wiki/Quoted-printable";
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this.inputType = "string";
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this.outputType = "byteArray";
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this.args = [];
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this.patterns = [
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{
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match: "^[\\x21-\\x3d\\x3f-\\x7e \\t]*(?:=[\\da-f]{2}|=\\r?\\n)(?:[\\x21-\\x3d\\x3f-\\x7e \\t]|=[\\da-f]{2}|=\\r?\\n)*$",
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flags: "i",
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args: []
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},
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {byteArray}
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*/
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run(input, args) {
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const str = input.replace(/=(?:\r?\n|$)/g, "");
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const encodedBytesCount = (str.match(/=[\da-fA-F]{2}/g) || []).length,
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bufferLength = str.length - encodedBytesCount * 2,
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buffer = new Array(bufferLength);
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let chr, hex,
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bufferPos = 0;
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for (let i = 0, len = str.length; i < len; i++) {
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chr = str.charAt(i);
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if (chr === "=" && (hex = str.substr(i + 1, 2)) && /[\da-fA-F]{2}/.test(hex)) {
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buffer[bufferPos++] = parseInt(hex, 16);
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i += 2;
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continue;
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}
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buffer[bufferPos++] = chr.charCodeAt(0);
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}
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return buffer;
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}
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}
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export default FromQuotedPrintable;
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