CyberChef/src/core/operations/FromQuotedPrintable.mjs

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/**
* Some parts taken from mimelib (http://github.com/andris9/mimelib)
* @author Andris Reinman
* @license MIT
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation";
/**
* From Quoted Printable operation
*/
class FromQuotedPrintable extends Operation {
/**
* FromQuotedPrintable constructor
*/
constructor() {
super();
this.name = "From Quoted Printable";
this.module = "Default";
this.description = "Converts QP-encoded text back to standard text.";
this.inputType = "string";
this.outputType = "byteArray";
this.args = [];
this.patterns = [
{
match: "^[\\x21-\\x3d\\x3f-\\x7e \\t]*(?:=[\\da-f]{2}|=\\r?\\n)(?:[\\x21-\\x3d\\x3f-\\x7e \\t]|=[\\da-f]{2}|=\\r?\\n)*$",
flags: "i",
args: []
},
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {byteArray}
*/
run(input, args) {
const str = input.replace(/=(?:\r?\n|$)/g, "");
const encodedBytesCount = (str.match(/=[\da-fA-F]{2}/g) || []).length,
bufferLength = str.length - encodedBytesCount * 2,
buffer = new Array(bufferLength);
let chr, hex,
bufferPos = 0;
for (let i = 0, len = str.length; i < len; i++) {
chr = str.charAt(i);
if (chr === "=" && (hex = str.substr(i + 1, 2)) && /[\da-fA-F]{2}/.test(hex)) {
buffer[bufferPos++] = parseInt(hex, 16);
i += 2;
continue;
}
buffer[bufferPos++] = chr.charCodeAt(0);
}
return buffer;
}
}
export default FromQuotedPrintable;