1e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka/* 2e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * Copyright (C) 2012 The Android Open Source Project 3e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * 4e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * Licensed under the Apache License, Version 2.0 (the "License"); 5e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * you may not use this file except in compliance with the License. 6e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * You may obtain a copy of the License at 7e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * 8e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * http://www.apache.org/licenses/LICENSE-2.0 9e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * 10e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * Unless required by applicable law or agreed to in writing, software 11e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * distributed under the License is distributed on an "AS IS" BASIS, 12e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * See the License for the specific language governing permissions and 14e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * limitations under the License. 15e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka */ 16e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 17e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurkapackage com.android.gallery3d.exif; 18e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 19e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurkaimport android.util.Log; 20e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 21e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurkaimport java.io.IOException; 22e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurkaimport java.io.InputStream; 23e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 24e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka/** 25e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * This class reads the EXIF header of a JPEG file and stores it in 26e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * {@link ExifData}. 27e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka */ 28e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurkaclass ExifReader { 29e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka private static final String TAG = "ExifReader"; 30e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 31e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka private final ExifInterface mInterface; 32e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 33e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka ExifReader(ExifInterface iRef) { 34e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka mInterface = iRef; 35e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 36e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 37e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka /** 38e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * Parses the inputStream and and returns the EXIF data in an 39e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * {@link ExifData}. 40e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * 41e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * @throws ExifInvalidFormatException 42e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka * @throws IOException 43e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka */ 44e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException, 45e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka IOException { 46e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka ExifParser parser = ExifParser.parse(inputStream, mInterface); 47e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka ExifData exifData = new ExifData(parser.getByteOrder()); 48e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka ExifTag tag = null; 49e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka 50e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka int event = parser.next(); 51e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka while (event != ExifParser.EVENT_END) { 52e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka switch (event) { 53e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka case ExifParser.EVENT_START_OF_IFD: 54e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka exifData.addIfdData(new IfdData(parser.getCurrentIfd())); 55e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka break; 56e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka case ExifParser.EVENT_NEW_TAG: 57e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka tag = parser.getTag(); 58e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka if (!tag.hasValue()) { 59e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka parser.registerForTagValue(tag); 60e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } else { 61e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka exifData.getIfdData(tag.getIfd()).setTag(tag); 62e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 63e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka break; 64e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG: 65e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka tag = parser.getTag(); 66e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) { 67e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka parser.readFullTagValue(tag); 68e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 69e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka exifData.getIfdData(tag.getIfd()).setTag(tag); 70e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka break; 71e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka case ExifParser.EVENT_COMPRESSED_IMAGE: 72e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka byte buf[] = new byte[parser.getCompressedImageSize()]; 73e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka if (buf.length == parser.read(buf)) { 74e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka exifData.setCompressedThumbnail(buf); 75e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } else { 76e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka Log.w(TAG, "Failed to read the compressed thumbnail"); 77e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 78e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka break; 79e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka case ExifParser.EVENT_UNCOMPRESSED_STRIP: 80e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka buf = new byte[parser.getStripSize()]; 81e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka if (buf.length == parser.read(buf)) { 82e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka exifData.setStripBytes(parser.getStripIndex(), buf); 83e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } else { 84e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka Log.w(TAG, "Failed to read the strip bytes"); 85e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 86e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka break; 87e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 88e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka event = parser.next(); 89e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 90e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka return exifData; 91e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka } 92e8d1bf7a439450b9979701909164a6baffbe8baeMichael Jurka} 93