1 /* 2 * Copyright (C) 2016 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.dialer.callcomposer.camera.exif; 18 19 import com.android.dialer.common.LogUtil; 20 import java.io.IOException; 21 import java.io.InputStream; 22 23 /** This class reads the EXIF header of a JPEG file and stores it in {@link ExifData}. */ 24 class ExifReader { 25 26 private final ExifInterface mInterface; 27 ExifReader(ExifInterface iRef)28 ExifReader(ExifInterface iRef) { 29 mInterface = iRef; 30 } 31 32 /** 33 * Parses the inputStream and and returns the EXIF data in an {@link ExifData}. 34 * 35 * @throws ExifInvalidFormatException 36 * @throws java.io.IOException 37 */ read(InputStream inputStream)38 protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException, IOException { 39 ExifParser parser = ExifParser.parse(inputStream, mInterface); 40 ExifData exifData = new ExifData(); 41 ExifTag tag; 42 43 int event = parser.next(); 44 while (event != ExifParser.EVENT_END) { 45 switch (event) { 46 case ExifParser.EVENT_START_OF_IFD: 47 exifData.addIfdData(new IfdData(parser.getCurrentIfd())); 48 break; 49 case ExifParser.EVENT_NEW_TAG: 50 tag = parser.getTag(); 51 if (!tag.hasValue()) { 52 parser.registerForTagValue(tag); 53 } else { 54 exifData.getIfdData(tag.getIfd()).setTag(tag); 55 } 56 break; 57 case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG: 58 tag = parser.getTag(); 59 if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) { 60 parser.readFullTagValue(tag); 61 } 62 exifData.getIfdData(tag.getIfd()).setTag(tag); 63 break; 64 case ExifParser.EVENT_COMPRESSED_IMAGE: 65 byte[] buf = new byte[parser.getCompressedImageSize()]; 66 if (buf.length != parser.read(buf)) { 67 LogUtil.i("ExifReader.read", "Failed to read the compressed thumbnail"); 68 } 69 break; 70 case ExifParser.EVENT_UNCOMPRESSED_STRIP: 71 buf = new byte[parser.getStripSize()]; 72 if (buf.length != parser.read(buf)) { 73 LogUtil.i("ExifReader.read", "Failed to read the strip bytes"); 74 } 75 break; 76 } 77 event = parser.next(); 78 } 79 return exifData; 80 } 81 } 82