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Tidied up Steganography operations. FileType and toBase64 functions now accept ArrayBuffers.

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This commit is contained in:
n1474335 2019-09-04 13:54:59 +01:00
parent 5bc5c0df90
commit eb769c7fb4
28 changed files with 81 additions and 75 deletions
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30
src/core/operations/RandomizeColourPalette.mjs
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@ -6,12 +6,12 @@
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils";
import PseudoRandomNumberGenerator from "./PseudoRandomNumberGenerator.mjs";
import { isImage } from "../lib/FileType";
import Utils from "../Utils.mjs";
import { isImage } from "../lib/FileType.mjs";
import { runHash } from "../lib/Hash.mjs";
import { toBase64 } from "../lib/Base64";
import { toBase64 } from "../lib/Base64.mjs";
import jimp from "jimp";
import { toHex } from "../lib/Hex.mjs";
/**
* Randomize Colour Palette operation
@ -26,10 +26,10 @@ class RandomizeColourPalette extends Operation {
this.name = "Randomize Colour Palette";
this.module = "Image";
this.description = "Randomize's each colour in an image's colour palette. This can often reveal text or symbols that were previously a very similar colour to their surroundings.";
this.infoURL = "https://en.wikipedia.org/wiki/Indexed_color";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.description = "Randomizes each colour in an image's colour palette. This can often reveal text or symbols that were previously a very similar colour to their surroundings, a technique sometimes used in Steganography.";
this.infoURL = "https://wikipedia.org/wiki/Indexed_color";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.presentType = "html";
this.args = [
{
@ -41,15 +41,15 @@ class RandomizeColourPalette extends Operation {
}
/**
* @param {byteArray} input
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
* @returns {ArrayBuffer}
*/
async run(input, args) {
if (!isImage(input)) throw new OperationError("Please enter a valid image file.");
const seed = args[0] || (new PseudoRandomNumberGenerator()).run("", [5, "Hex"]),
parsedImage = await jimp.read(Buffer.from(input)),
const seed = args[0] || (Math.random().toString().substr(2)),
parsedImage = await jimp.read(input),
width = parsedImage.bitmap.width,
height = parsedImage.bitmap.height;
@ -64,16 +64,16 @@ class RandomizeColourPalette extends Operation {
const imageBuffer = await parsedImage.getBufferAsync(jimp.AUTO);
return Array.from(imageBuffer);
return new Uint8Array(imageBuffer).buffer;
}
/**
* Displays the extracted data as an image for web apps.
* @param {byteArray} data
* @param {ArrayBuffer} data
* @returns {html}
*/
present(data) {
if (!data.length) return "";
if (!data.byteLength) return "";
const type = isImage(data);
return `<img src="data:${type};base64,${toBase64(data)}">`;