Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 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 | |
ztenghui | a16e7b5 | 2013-08-23 11:47:56 -0700 | [diff] [blame] | 17 | package com.android.camera.exif; |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 18 | |
Angus Kong | 2bca210 | 2014-03-11 16:27:30 -0700 | [diff] [blame^] | 19 | import com.android.camera.debug.Log; |
Earl Ou | 0490334 | 2012-10-19 23:27:44 +0800 | [diff] [blame] | 20 | |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 21 | import java.io.IOException; |
| 22 | import java.io.InputStream; |
| 23 | |
| 24 | /** |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 25 | * This class reads the EXIF header of a JPEG file and stores it in |
| 26 | * {@link ExifData}. |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 27 | */ |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 28 | class ExifReader { |
Angus Kong | 2bca210 | 2014-03-11 16:27:30 -0700 | [diff] [blame^] | 29 | private static final Log.Tag TAG = new Log.Tag("ExifReader"); |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 30 | |
| 31 | private final ExifInterface mInterface; |
| 32 | |
| 33 | ExifReader(ExifInterface iRef) { |
| 34 | mInterface = iRef; |
| 35 | } |
| 36 | |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 37 | /** |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 38 | * Parses the inputStream and and returns the EXIF data in an |
| 39 | * {@link ExifData}. |
| 40 | * |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 41 | * @throws ExifInvalidFormatException |
| 42 | * @throws IOException |
| 43 | */ |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 44 | protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException, |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 45 | IOException { |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 46 | ExifParser parser = ExifParser.parse(inputStream, mInterface); |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 47 | ExifData exifData = new ExifData(parser.getByteOrder()); |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 48 | ExifTag tag = null; |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 49 | |
| 50 | int event = parser.next(); |
| 51 | while (event != ExifParser.EVENT_END) { |
| 52 | switch (event) { |
| 53 | case ExifParser.EVENT_START_OF_IFD: |
| 54 | exifData.addIfdData(new IfdData(parser.getCurrentIfd())); |
| 55 | break; |
| 56 | case ExifParser.EVENT_NEW_TAG: |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 57 | tag = parser.getTag(); |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 58 | if (!tag.hasValue()) { |
| 59 | parser.registerForTagValue(tag); |
| 60 | } else { |
| 61 | exifData.getIfdData(tag.getIfd()).setTag(tag); |
| 62 | } |
| 63 | break; |
| 64 | case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG: |
| 65 | tag = parser.getTag(); |
| 66 | if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) { |
Earl Ou | 0490334 | 2012-10-19 23:27:44 +0800 | [diff] [blame] | 67 | parser.readFullTagValue(tag); |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 68 | } |
| 69 | exifData.getIfdData(tag.getIfd()).setTag(tag); |
| 70 | break; |
| 71 | case ExifParser.EVENT_COMPRESSED_IMAGE: |
| 72 | byte buf[] = new byte[parser.getCompressedImageSize()]; |
Earl Ou | 0490334 | 2012-10-19 23:27:44 +0800 | [diff] [blame] | 73 | if (buf.length == parser.read(buf)) { |
| 74 | exifData.setCompressedThumbnail(buf); |
| 75 | } else { |
| 76 | Log.w(TAG, "Failed to read the compressed thumbnail"); |
| 77 | } |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 78 | break; |
| 79 | case ExifParser.EVENT_UNCOMPRESSED_STRIP: |
| 80 | buf = new byte[parser.getStripSize()]; |
Earl Ou | 0490334 | 2012-10-19 23:27:44 +0800 | [diff] [blame] | 81 | if (buf.length == parser.read(buf)) { |
| 82 | exifData.setStripBytes(parser.getStripIndex(), buf); |
Ruben Brunk | c274ded | 2013-03-11 19:00:12 -0700 | [diff] [blame] | 83 | } else { |
Earl Ou | 0490334 | 2012-10-19 23:27:44 +0800 | [diff] [blame] | 84 | Log.w(TAG, "Failed to read the strip bytes"); |
| 85 | } |
Hung-ying Tyan | 2523f43 | 2012-10-19 20:50:50 +0800 | [diff] [blame] | 86 | break; |
| 87 | } |
| 88 | event = parser.next(); |
| 89 | } |
| 90 | return exifData; |
| 91 | } |
Earl Ou | 0490334 | 2012-10-19 23:27:44 +0800 | [diff] [blame] | 92 | } |