Merge branch 'feature/ocr' of https://github.com/MShwed/CyberChef into MShwed-feature/ocr
This commit is contained in:
n1474335
commit
a8ad10757c
79
package-lock.json
generated
79
package-lock.json
generated
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@ -143,6 +143,7 @@
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@ -405,7 +405,8 @@
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"Hex Density chart",
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"Scatter chart",
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"Series chart",
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"Heatmap chart"
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"Heatmap chart",
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"OCR"
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]
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},
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{
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72
src/core/operations/OCR.mjs
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72
src/core/operations/OCR.mjs
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/**
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* @author mshwed [m@ttshwed.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 { isWorkerEnvironment } from "../Utils.mjs";
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import jimp from "jimp";
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import Tesseract from "tesseract.js";
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const { TesseractWorker } = Tesseract;
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/**
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* OCR operation
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*/
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class OCR extends Operation {
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/**
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* OCR constructor
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*/
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constructor() {
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super();
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this.name = "OCR";
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this.module = "Default";
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this.description = "Optical character recognition or optical character reader (OCR) is the mechanical or electronic conversion of images of typed, handwritten or printed text into machine-encoded text.";
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this.infoURL = "https://en.wikipedia.org/wiki/Optical_character_recognition";
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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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/**
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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)) {
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throw new OperationError("Invalid File Type");
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}
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try {
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if (isWorkerEnvironment())
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self.sendStatusMessage("Performing OCR on image...");
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let image;
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try {
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image = await jimp.read(input);
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image = await image.getBase64Async(jimp.AUTO);
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} catch (err) {
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throw new OperationError(`Error loading image. (${err})`);
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}
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const worker = new TesseractWorker();
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const result = await worker.recognize(image)
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.progress(progress => {
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if (isWorkerEnvironment()) self.sendStatusMessage(`${progress.status} - ${(parseFloat(progress.progress)*100).toFixed(2)}%`);
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});
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return result.text;
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} catch (err) {
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throw new OperationError(`Error performing OCR on image. (${err})`);
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}
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}
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}
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export default OCR;
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