mirror of https://github.com/gchq/CyberChef.git
66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
/**
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* @author Ge0rg3 [georgeomnet+cyberchef@gmail.com]
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import OperationError from "../errors/OperationError.mjs";
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import { isImage } from "../lib/FileType.mjs";
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import jimp from "jimp";
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import {RGBA_DELIM_OPTIONS} from "../lib/Delim.mjs";
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/**
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* Extract RGBA operation
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*/
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class ExtractRGBA extends Operation {
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/**
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* ExtractRGBA constructor
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*/
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constructor() {
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super();
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this.name = "Extract RGBA";
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this.module = "Image";
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this.description = "Extracts each pixel's RGBA value in an image. These are sometimes used in Steganography to hide text or data.";
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this.infoURL = "https://wikipedia.org/wiki/RGBA_color_space";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = [
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{
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name: "Delimiter",
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type: "editableOption",
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value: RGBA_DELIM_OPTIONS
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},
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{
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name: "Include Alpha",
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type: "boolean",
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value: true
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}
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];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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async run(input, args) {
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if (!isImage(input)) throw new OperationError("Please enter a valid image file.");
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const delimiter = args[0],
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includeAlpha = args[1],
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parsedImage = await jimp.read(input);
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let bitmap = parsedImage.bitmap.data;
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bitmap = includeAlpha ? bitmap : bitmap.filter((val, idx) => idx % 4 !== 3);
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return bitmap.join(delimiter);
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}
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}
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export default ExtractRGBA;
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