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Merge with qr-improvements.

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Change QR code ops to use ArrayBuffer.
Add new function to Utils to convert a string to arraybuffer.
This commit is contained in:
j433866 2019-04-01 14:11:37 +01:00
commit c97e77c765
5 changed files with 148 additions and 98 deletions
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16
src/core/Utils.mjs
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@ -529,6 +529,22 @@ class Utils {
}
/**
* Converts a string to an ArrayBuffer.
*
* @param {string} string
*/
static strToArrayBuffer(string) {
const arrayBuffer = new ArrayBuffer(string.length * 2);
const arrayBufferView = new Uint8Array(arrayBuffer);
for (let i = 0; i < string.length; i++) {
arrayBufferView[i] = string.charCodeAt(i);
}
return arrayBuffer;
}
/**
* Parses CSV data and returns it as a two dimensional array or strings.
*

12
src/core/lib/Magic.mjs
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@ -312,6 +312,11 @@ class Magic {
return;
}
// If the recipe returned an empty buffer, do not continue
if (_buffersEqual(output, new ArrayBuffer())) {
return;
}
const magic = new Magic(output, this.opPatterns),
speculativeResults = await magic.speculativeExecution(
depth-1, extLang, intensive, [...recipeConfig, opConfig], op.useful, crib);
@ -395,7 +400,12 @@ class Magic {
const recipe = new Recipe(recipeConfig);
try {
await recipe.execute(dish);
return dish.get(Dish.ARRAY_BUFFER);
// Return an empty buffer if the recipe did not run to completion
if (recipe.lastRunOp === recipe.opList[recipe.opList.length - 1]) {
return dish.get(Dish.ARRAY_BUFFER);
} else {
return new ArrayBuffer();
}
} catch (err) {
// If there are errors, return an empty buffer
return new ArrayBuffer();

91
src/core/lib/QRCode.mjs Normal file
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@ -0,0 +1,91 @@
/**
* QR code resources
*
* @author j433866 [j433866@gmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import OperationError from "../errors/OperationError";
import jsQR from "jsqr";
import qr from "qr-image";
import jimp from "jimp";
import Utils from "../Utils";
/**
* Parses a QR code image from an image
*
* @param {ArrayBuffer} input
* @param {boolean} normalise
* @returns {string}
*/
export async function parseQrCode(input, normalise) {
let image;
try {
image = await jimp.read(input);
} catch (err) {
throw new OperationError(`Error opening image. (${err})`);
}
try {
if (normalise) {
image.rgba(false);
image.background(0xFFFFFFFF);
image.normalize();
image.greyscale();
}
} catch (err) {
throw new OperationError(`Error normalising iamge. (${err})`);
}
const qrData = jsQR(image.bitmap.data, image.getWidth(), image.getHeight());
if (qrData) {
return qrData.data;
} else {
throw new OperationError("Could not read a QR code from the image.");
}
}
/**
* Generates a QR code from the input string
*
* @param {string} input
* @param {string} format
* @param {number} moduleSize
* @param {number} margin
* @param {string} errorCorrection
* @returns {ArrayBuffer}
*/
export function generateQrCode(input, format, moduleSize, margin, errorCorrection) {
const formats = ["SVG", "EPS", "PDF", "PNG"];
if (!formats.includes(format.toUpperCase())) {
throw new OperationError("Unsupported QR code format.");
}
let qrImage;
try {
qrImage = qr.imageSync(input, {
type: format,
size: moduleSize,
margin: margin,
"ec_level": errorCorrection.charAt(0).toUpperCase()
});
} catch (err) {
throw new OperationError(`Error generating QR code. (${err})`);
}
if (!qrImage) {
throw new OperationError("Error generating QR code.");
}
switch (format) {
case "SVG":
case "EPS":
case "PDF":
return Utils.strToArrayBuffer(qrImage);
case "PNG":
return qrImage.buffer;
default:
throw new OperationError("Unsupported QR code format.");
}
}

59
src/core/operations/GenerateQRCode.mjs
View File

@ -6,7 +6,7 @@
import Operation from "../Operation";
import OperationError from "../errors/OperationError";
import qr from "qr-image";
import { generateQrCode } from "../lib/QRCode";
import { toBase64 } from "../lib/Base64";
import { isImage } from "../lib/FileType";
import Utils from "../Utils";
@ -27,7 +27,7 @@ class GenerateQRCode extends Operation {
this.description = "Generates a Quick Response (QR) code from the input text.<br><br>A QR code is a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached.";
this.infoURL = "https://wikipedia.org/wiki/QR_code";
this.inputType = "string";
this.outputType = "byteArray";
this.outputType = "ArrayBuffer";
this.presentType = "html";
this.args = [
{
@ -38,12 +38,14 @@ class GenerateQRCode extends Operation {
{
"name": "Module size (px)",
"type": "number",
"value": 5
"value": 5,
"min": 1
},
{
"name": "Margin (num modules)",
"type": "number",
"value": 2
"value": 2,
"min": 0
},
{
"name": "Error correction",
@ -57,61 +59,34 @@ class GenerateQRCode extends Operation {
/**
* @param {string} input
* @param {Object[]} args
* @returns {byteArray}
* @returns {ArrayBuffer}
*/
run(input, args) {
const [format, size, margin, errorCorrection] = args;
// Create new QR image from the input data, and convert it to a buffer
const qrImage = qr.imageSync(input, {
type: format,
size: size,
margin: margin,
"ec_level": errorCorrection.charAt(0).toUpperCase()
});
if (qrImage == null) {
throw new OperationError("Error generating QR code.");
}
switch (format) {
case "SVG":
case "EPS":
case "PDF":
return [...Buffer.from(qrImage)];
case "PNG":
// Return the QR image buffer as a byte array
return [...qrImage];
default:
throw new OperationError("Unsupported QR code format.");
}
return generateQrCode(input, format, size, margin, errorCorrection);
}
/**
* Displays the QR image using HTML for web apps
*
* @param {byteArray} data
* @param {ArrayBuffer} data
* @returns {html}
*/
present(data, args) {
if (!data.length) return "";
const [format] = args;
if (!data.byteLength && !data.length) return "";
const dataArray = new Uint8Array(data),
[format] = args;
if (format === "PNG") {
let dataURI = "data:";
const mime = isImage(data);
if (mime){
dataURI += mime + ";";
} else {
throw new OperationError("Invalid PNG file generated by QR image");
const type = isImage(dataArray);
if (!type) {
throw new OperationError("Invalid file type.");
}
dataURI += "base64," + toBase64(data);
return `<img src="${dataURI}">`;
return `<img src="data:${type};base64,${toBase64(dataArray)}">`;
}
return Utils.byteArrayToChars(data);
return Utils.arrayBufferToStr(data);
}
}

68
src/core/operations/ParseQRCode.mjs
View File

@ -6,9 +6,8 @@
import Operation from "../Operation";
import OperationError from "../errors/OperationError";
import { isImage } from "../lib/FileType";
import jsqr from "jsqr";
import jimp from "jimp";
import { isImage } from "../lib/FileType.mjs";
import { parseQrCode } from "../lib/QRCode";
/**
* Parse QR Code operation
@ -34,6 +33,14 @@ class ParseQRCode extends Operation {
"value": false
}
];
this.patterns = [
{
"match": "^(?:\\xff\\xd8\\xff|\\x89\\x50\\x4e\\x47|\\x47\\x49\\x46|.{8}\\x57\\x45\\x42\\x50|\\x42\\x4d)",
"flags": "",
"args": [false],
"useful": true
}
];
}
/**
@ -44,59 +51,10 @@ class ParseQRCode extends Operation {
async run(input, args) {
const [normalise] = args;
// Make sure that the input is an image
if (!isImage(new Uint8Array(input))) throw new OperationError("Invalid file type.");
let image = input;
if (normalise) {
// Process the image to be easier to read by jsqr
// Disables the alpha channel
// Sets the image default background to white
// Normalises the image colours
// Makes the image greyscale
// Converts image to a JPEG
image = await new Promise((resolve, reject) => {
jimp.read(input)
.then(image => {
image
.rgba(false)
.background(0xFFFFFFFF)
.normalize()
.greyscale()
.getBuffer(jimp.MIME_JPEG, (error, result) => {
resolve(result);
});
})
.catch(err => {
reject(new OperationError("Error reading the image file."));
});
});
if (!isImage(input)) {
throw new OperationError("Invalid file type.");
}
if (image instanceof OperationError) {
throw image;
}
return new Promise((resolve, reject) => {
jimp.read(Buffer.from(image))
.then(image => {
if (image.bitmap != null) {
const qrData = jsqr(image.bitmap.data, image.getWidth(), image.getHeight());
if (qrData != null) {
resolve(qrData.data);
} else {
reject(new OperationError("Couldn't read a QR code from the image."));
}
} else {
reject(new OperationError("Error reading the image file."));
}
})
.catch(err => {
reject(new OperationError("Error reading the image file."));
});
});
return await parseQrCode(input, normalise);
}
}