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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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27
src/core/operations/ViewBitPlane.mjs
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@ -4,11 +4,11 @@
* @license Apache-2.0
*/
import Operation from "../Operation";
import OperationError from "../errors/OperationError";
import Utils from "../Utils";
import { isImage } from "../lib/FileType";
import { toBase64 } from "../lib/Base64";
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils.mjs";
import { isImage } from "../lib/FileType.mjs";
import { toBase64 } from "../lib/Base64.mjs";
import jimp from "jimp";
/**
@ -24,10 +24,10 @@ class ViewBitPlane extends Operation {
this.name = "View Bit Plane";
this.module = "Image";
this.description = "Extracts and displays a bit plane of any given image. These show only a single bit from each pixel, and so are often used to hide messages in Steganography.";
this.description = "Extracts and displays a bit plane of any given image. These show only a single bit from each pixel, and can be used to hide messages in Steganography.";
this.infoURL = "https://wikipedia.org/wiki/Bit_plane";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.presentType = "html";
this.args = [
{
@ -44,15 +44,15 @@ class ViewBitPlane extends Operation {
}
/**
* @param {File} input
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {File}
* @returns {ArrayBuffer}
*/
async run(input, args) {
if (!isImage(input)) throw new OperationError("Please enter a valid image file.");
const [colour, bit] = args,
parsedImage = await jimp.read(Buffer.from(input)),
parsedImage = await jimp.read(input),
width = parsedImage.bitmap.width,
height = parsedImage.bitmap.height,
colourIndex = COLOUR_OPTIONS.indexOf(colour),
@ -62,7 +62,6 @@ class ViewBitPlane extends Operation {
throw new OperationError("Error: Bit argument must be between 0 and 7");
}
let pixel, bin, newPixelValue;
parsedImage.scan(0, 0, width, height, function(x, y, idx) {
@ -81,12 +80,12 @@ class ViewBitPlane 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) {