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.messaging.util.exif; 18 19 import android.util.Log; 20 import com.android.messaging.util.LogUtil; 21 22 import java.io.IOException; 23 import java.io.InputStream; 24 25 /** 26 * This class reads the EXIF header of a JPEG file and stores it in 27 * {@link ExifData}. 28 */ 29 class ExifReader { 30 private static final String TAG = LogUtil.BUGLE_TAG; 31 32 private final ExifInterface mInterface; 33 ExifReader(ExifInterface iRef)34 ExifReader(ExifInterface iRef) { 35 mInterface = iRef; 36 } 37 38 /** 39 * Parses the inputStream and and returns the EXIF data in an 40 * {@link ExifData}. 41 * 42 * @throws ExifInvalidFormatException 43 * @throws java.io.IOException 44 */ read(InputStream inputStream)45 protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException, 46 IOException { 47 ExifParser parser = ExifParser.parse(inputStream, mInterface); 48 ExifData exifData = new ExifData(parser.getByteOrder()); 49 ExifTag tag = null; 50 51 int event = parser.next(); 52 while (event != ExifParser.EVENT_END) { 53 switch (event) { 54 case ExifParser.EVENT_START_OF_IFD: 55 exifData.addIfdData(new IfdData(parser.getCurrentIfd())); 56 break; 57 case ExifParser.EVENT_NEW_TAG: 58 tag = parser.getTag(); 59 if (!tag.hasValue()) { 60 parser.registerForTagValue(tag); 61 } else { 62 exifData.getIfdData(tag.getIfd()).setTag(tag); 63 } 64 break; 65 case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG: 66 tag = parser.getTag(); 67 if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) { 68 parser.readFullTagValue(tag); 69 } 70 exifData.getIfdData(tag.getIfd()).setTag(tag); 71 break; 72 case ExifParser.EVENT_COMPRESSED_IMAGE: 73 byte buf[] = new byte[parser.getCompressedImageSize()]; 74 if (buf.length == parser.read(buf)) { 75 exifData.setCompressedThumbnail(buf); 76 } else { 77 Log.w(TAG, "Failed to read the compressed thumbnail"); 78 } 79 break; 80 case ExifParser.EVENT_UNCOMPRESSED_STRIP: 81 buf = new byte[parser.getStripSize()]; 82 if (buf.length == parser.read(buf)) { 83 exifData.setStripBytes(parser.getStripIndex(), buf); 84 } else { 85 Log.w(TAG, "Failed to read the strip bytes"); 86 } 87 break; 88 } 89 event = parser.next(); 90 } 91 return exifData; 92 } 93 } 94