1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.exif; 18 19 import org.xmlpull.v1.XmlPullParser; 20 import org.xmlpull.v1.XmlPullParserException; 21 22 import java.io.IOException; 23 import java.util.HashMap; 24 25 public class ExifXmlReader { 26 27 private static final String XML_EXIF_TAG = "exif"; 28 private static final String XML_IFD_TAG = "ifd"; 29 private static final String XML_IFD_NAME = "name"; 30 private static final String XML_TAG = "tag"; 31 private static final String XML_IFD0 = "ifd0"; 32 private static final String XML_IFD1 = "ifd1"; 33 private static final String XML_EXIF_IFD = "exif-ifd"; 34 private static final String XML_INTEROPERABILITY_IFD = "interoperability-ifd"; 35 private static final String XML_TAG_ID = "id"; 36 readXml(XmlPullParser parser, HashMap<Short, String> ifd0, HashMap<Short, String> ifd1, HashMap<Short, String> exifIfd, HashMap<Short, String> interoperabilityIfd)37 public static void readXml(XmlPullParser parser, HashMap<Short, String> ifd0, 38 HashMap<Short, String> ifd1, HashMap<Short, String> exifIfd, 39 HashMap<Short, String> interoperabilityIfd) throws XmlPullParserException, 40 IOException { 41 42 while (parser.next() != XmlPullParser.END_DOCUMENT) { 43 if (parser.getEventType() == XmlPullParser.START_TAG) { 44 break; 45 } 46 } 47 48 assert(parser.getName().equals(XML_EXIF_TAG)); 49 50 parser.require(XmlPullParser.START_TAG, null, XML_EXIF_TAG); 51 while (parser.next() != XmlPullParser.END_TAG) { 52 if (parser.getEventType() == XmlPullParser.START_TAG) { 53 readXmlIfd(parser, ifd0, ifd1, exifIfd, interoperabilityIfd); 54 } 55 } 56 parser.require(XmlPullParser.END_TAG, null, XML_EXIF_TAG); 57 } 58 readXmlIfd(XmlPullParser parser, HashMap<Short, String> ifd0, HashMap<Short, String> ifd1, HashMap<Short, String> exifIfd, HashMap<Short, String> interoperabilityIfd)59 private static void readXmlIfd(XmlPullParser parser, HashMap<Short, String> ifd0, 60 HashMap<Short, String> ifd1, HashMap<Short, String> exifIfd, 61 HashMap<Short, String> interoperabilityIfd) throws XmlPullParserException, 62 IOException { 63 parser.require(XmlPullParser.START_TAG, null, XML_IFD_TAG); 64 String name = parser.getAttributeValue(null, XML_IFD_NAME); 65 HashMap<Short, String> ifdData = null; 66 if (XML_IFD0.equals(name)) { 67 ifdData = ifd0; 68 } else if (XML_IFD1.equals(name)) { 69 ifdData = ifd1; 70 } else if (XML_EXIF_IFD.equals(name)) { 71 ifdData = exifIfd; 72 } else if (XML_INTEROPERABILITY_IFD.equals(name)) { 73 ifdData = interoperabilityIfd; 74 } else { 75 throw new RuntimeException("Unknown IFD name in xml file: " + name); 76 } 77 while (parser.next() != XmlPullParser.END_TAG) { 78 if (parser.getEventType() == XmlPullParser.START_TAG) { 79 readXmlTag(parser, ifdData); 80 } 81 } 82 parser.require(XmlPullParser.END_TAG, null, XML_IFD_TAG); 83 } 84 readXmlTag(XmlPullParser parser, HashMap<Short, String> data)85 private static void readXmlTag(XmlPullParser parser, HashMap<Short, String> data) 86 throws XmlPullParserException, IOException { 87 parser.require(XmlPullParser.START_TAG, null, XML_TAG); 88 short id = Integer.decode(parser.getAttributeValue(null, XML_TAG_ID)).shortValue(); 89 String value = ""; 90 if (parser.next() == XmlPullParser.TEXT) { 91 value = parser.getText(); 92 parser.next(); 93 } 94 data.put(id, value); 95 parser.require(XmlPullParser.END_TAG, null, XML_TAG); 96 } 97 }