初始化fy

uni_modules/UniDevTools/node_modules/exif-parser/lib/jpeg.js

@@ -0,0 +1,66 @@
+/*jslint browser: true, devel: true, bitwise: false, debug: true, eqeq: false, es5: true, evil: false, forin: false, newcap: false, nomen: true, plusplus: true, regexp: false, unparam: false, sloppy: true, stupid: false, sub: false, todo: true, vars: true, white: true */
+
+module.exports = {
+	parseSections: function(stream, iterator) {
+		var len, markerType;
+		stream.setBigEndian(true);
+		//stop reading the stream at the SOS (Start of Stream) marker,
+		//because its length is not stored in the header so we can't
+		//know where to jump to. The only marker after that is just EOI (End Of Image) anyway
+		while(stream.remainingLength() > 0 && markerType !== 0xDA) {
+			if(stream.nextUInt8() !== 0xFF) {
+				throw new Error('Invalid JPEG section offset');
+			}
+			markerType = stream.nextUInt8();
+			//don't read size from markers that have no datas
+			if((markerType >= 0xD0 && markerType <= 0xD9) || markerType === 0xDA) {
+				len = 0;
+			} else {
+				len = stream.nextUInt16() - 2;
+			}
+			iterator(markerType, stream.branch(0, len));
+			stream.skip(len);
+		}
+	},
+	//stream should be located after SOF section size and in big endian mode, like passed to parseSections iterator
+	getSizeFromSOFSection: function(stream) {
+		stream.skip(1);
+		return {
+			height: stream.nextUInt16(),
+			width: stream.nextUInt16()
+		};
+	},
+	getSectionName: function(markerType) {
+		var name, index;
+		switch(markerType) {
+			case 0xD8: name = 'SOI'; break;
+			case 0xC4: name = 'DHT'; break;
+			case 0xDB: name = 'DQT'; break;
+			case 0xDD: name = 'DRI'; break;
+			case 0xDA: name = 'SOS'; break;
+			case 0xFE: name = 'COM'; break;
+			case 0xD9: name = 'EOI'; break;
+			default:
+				if(markerType >= 0xE0 && markerType <= 0xEF) {
+					name = 'APP';
+					index = markerType - 0xE0;
+				}
+				else if(markerType >= 0xC0 && markerType <= 0xCF && markerType !== 0xC4 && markerType !== 0xC8 && markerType !== 0xCC) {
+					name = 'SOF';
+					index = markerType - 0xC0;
+				}
+				else if(markerType >= 0xD0 && markerType <= 0xD7) {
+					name = 'RST';
+					index = markerType - 0xD0;
+				}
+				break;
+		}
+		var nameStruct = {
+			name: name
+		};
+		if(typeof index === 'number') {
+			nameStruct.index = index;
+		}
+		return nameStruct;
+	}
+};