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91 lines
2.2 KiB
JavaScript
91 lines
2.2 KiB
JavaScript
var fs = require('fs')
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var imgType = require('image-type')
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var imgDecode = require('./src/imageDecode')
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var qrDecode = require('./src/QRDecode')
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/**
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* 通过Buffer识别二维码
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* @param {buufer} buffer 文件的Buffer
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*/
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function decodeByBuffer(buffer, options) {
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options || (options = {});
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var debug = options.debug;
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var type;
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return new Promise(function (res, rej) {
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type = (imgType(buffer) || {}).ext;
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switch (type) {
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case 'bmp':
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res(imgDecode.bmp(buffer));
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break;
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case 'jpg':
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res(imgDecode.jpg(buffer));
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break;
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case 'png':
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res(imgDecode.png(buffer));
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break;
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case 'gif':
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res(imgDecode.gif(buffer));
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break;
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default:
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if (type) {
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throw 'Support for this type! type as ' + type
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}
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throw 'not image!'
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}
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}).then(function (imageData) {
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//可能有多帧图片处理
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if (type == 'gif' || type == 'png') {
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return new Promise(function (res, rej) {
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var errList = [];
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var images = imageData;
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var onerr = function (e) {
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errList.push(e);
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if (errList.length < images.length) return;
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rej(errList);
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}
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debug && console.log('gif_length: ', imageData.length)
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if (imageData.length <= 0) {
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rej('解码失败!')
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} else if (imageData.length > 5 && !options.allFrames) {
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var l = 1, i = 0, sp;
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images = [];
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while (Math.pow(2, ++l) < imageData.length) {s}
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sp = (imageData.length - 1) / l;
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do {
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images.push(imageData[Math.floor(i * sp)])
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} while (i++ < l)
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}
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debug && console.log('gif_decode_length: ',images.length)
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images.forEach(function (v) {
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setTimeout(function () {
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try {
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res(qrDecode(v));
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} catch (e) {
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debug && console.log(e);
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onerr(e)
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}
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}, 0)
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})
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})
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}
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return qrDecode(imageData);
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})
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}
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/**
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* 识别二维码图片文件
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* @param {String} path 文件路径
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*/
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function decodeByPath(path,options) {
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return new Promise(function (res, rej) {
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fs.readFile(path, function (err, buffer) {
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if (err) { return rej(err) }
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res(decodeByBuffer(buffer,options));
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})
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})
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}
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qrDecode.decodeByBuffer = decodeByBuffer;
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qrDecode.decodeByPath = decodeByPath;
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module.exports = qrDecode; |