add image decode

server.js

@@ -0,0 +1,85 @@
+var fs = require('fs')
+var imgDecode = require('./src/imageDecode')
+var imgType = require('image-type')
+var qrDecode = require('./')
+// var jpg = require('./src/imageDecode/jpg');
+
+
+function decode(buffer) {
+	var type;
+	return new Promise(function (res, rej) {
+		type = (imgType(buffer) || {}).ext;
+		switch (type) {
+			case 'bmp':
+				res(imgDecode.bmp(buffer));
+				break;
+			case 'jpg':
+				res(imgDecode.jpg(buffer));
+				break;
+			case 'png':
+				res(imgDecode.png(buffer));
+				break;
+			case 'gif':
+				// var t1 = Date.now();
+				res(imgDecode.gif1(buffer));
+				// console.log('gif: ',Date.now() - t1);
+				break;
+			default:
+				if (type) {
+					throw 'Support for this type! type as ' + type
+				}
+				throw 'not image!'
+		}
+	}).then(function (imageData) {
+		if (type == 'gif') {
+			return new Promise(function (res, rej) {
+				var errList = [];
+				var images = imageData;
+				var onerr = function (e) {
+					errList.push(e);
+					if (errList.length < images.length) return;
+					rej('解码失败!')
+				}
+				// console.log('length',imageData.length)
+				if (imageData.length <= 0) {
+					rej('解码失败!')
+				} else if (imageData.length > 3) {
+					images = [];
+					var l = 1;
+					var i = 0;
+					while ( Math.pow(2,++l) < imageData.length){
+					}
+					// console.log('l:',l)
+					var sp = (imageData.length-1)/l;
+					// console.log('sp:',sp)
+					do{
+						// console.log(Math.floor(i*sp));
+						images.push(imageData[Math.floor(i*sp)])
+					}while(i++<l)
+				}
+				// console.log(images.length)
+				images.forEach(function (v) {
+					setTimeout(function () {
+						try {
+							res(qrDecode(v));
+						} catch (e) {
+							console.log(e);
+							onerr(e)
+						}
+					}, 0)
+				})
+			})
+		}
+		return qrDecode(imageData);
+	})
+}
+exports.decodeQRFile = function (path) {
+	return new Promise(function (res, rej) {
+		fs.readFile(path, function (err, buffer) {
+			if (err) { return rej(err) }
+			res(decode(buffer));
+		})
+	})
+}
+
+exports.decode = decode;