Michael Jurka | e8d1bf7 | 2013-09-09 15:58:54 +0200 | [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 | |
| 17 | package com.android.gallery3d.exif; |
| 18 | |
| 19 | import android.util.Log; |
| 20 | |
Michael Jurka | e8d1bf7 | 2013-09-09 15:58:54 +0200 | [diff] [blame] | 21 | import java.io.IOException; |
| 22 | import java.io.InputStream; |
| 23 | import java.nio.ByteBuffer; |
| 24 | import java.nio.ByteOrder; |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.List; |
| 27 | |
| 28 | class ExifModifier { |
| 29 | public static final String TAG = "ExifModifier"; |
| 30 | public static final boolean DEBUG = false; |
| 31 | private final ByteBuffer mByteBuffer; |
| 32 | private final ExifData mTagToModified; |
| 33 | private final List<TagOffset> mTagOffsets = new ArrayList<TagOffset>(); |
| 34 | private final ExifInterface mInterface; |
| 35 | private int mOffsetBase; |
| 36 | |
| 37 | private static class TagOffset { |
| 38 | final int mOffset; |
| 39 | final ExifTag mTag; |
| 40 | |
| 41 | TagOffset(ExifTag tag, int offset) { |
| 42 | mTag = tag; |
| 43 | mOffset = offset; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | protected ExifModifier(ByteBuffer byteBuffer, ExifInterface iRef) throws IOException, |
| 48 | ExifInvalidFormatException { |
| 49 | mByteBuffer = byteBuffer; |
| 50 | mOffsetBase = byteBuffer.position(); |
| 51 | mInterface = iRef; |
| 52 | InputStream is = null; |
| 53 | try { |
| 54 | is = new ByteBufferInputStream(byteBuffer); |
| 55 | // Do not require any IFD; |
| 56 | ExifParser parser = ExifParser.parse(is, mInterface); |
| 57 | mTagToModified = new ExifData(parser.getByteOrder()); |
| 58 | mOffsetBase += parser.getTiffStartPosition(); |
| 59 | mByteBuffer.position(0); |
| 60 | } finally { |
| 61 | ExifInterface.closeSilently(is); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | protected ByteOrder getByteOrder() { |
| 66 | return mTagToModified.getByteOrder(); |
| 67 | } |
| 68 | |
| 69 | protected boolean commit() throws IOException, ExifInvalidFormatException { |
| 70 | InputStream is = null; |
| 71 | try { |
| 72 | is = new ByteBufferInputStream(mByteBuffer); |
| 73 | int flag = 0; |
| 74 | IfdData[] ifdDatas = new IfdData[] { |
| 75 | mTagToModified.getIfdData(IfdId.TYPE_IFD_0), |
| 76 | mTagToModified.getIfdData(IfdId.TYPE_IFD_1), |
| 77 | mTagToModified.getIfdData(IfdId.TYPE_IFD_EXIF), |
| 78 | mTagToModified.getIfdData(IfdId.TYPE_IFD_INTEROPERABILITY), |
| 79 | mTagToModified.getIfdData(IfdId.TYPE_IFD_GPS) |
| 80 | }; |
| 81 | |
| 82 | if (ifdDatas[IfdId.TYPE_IFD_0] != null) { |
| 83 | flag |= ExifParser.OPTION_IFD_0; |
| 84 | } |
| 85 | if (ifdDatas[IfdId.TYPE_IFD_1] != null) { |
| 86 | flag |= ExifParser.OPTION_IFD_1; |
| 87 | } |
| 88 | if (ifdDatas[IfdId.TYPE_IFD_EXIF] != null) { |
| 89 | flag |= ExifParser.OPTION_IFD_EXIF; |
| 90 | } |
| 91 | if (ifdDatas[IfdId.TYPE_IFD_GPS] != null) { |
| 92 | flag |= ExifParser.OPTION_IFD_GPS; |
| 93 | } |
| 94 | if (ifdDatas[IfdId.TYPE_IFD_INTEROPERABILITY] != null) { |
| 95 | flag |= ExifParser.OPTION_IFD_INTEROPERABILITY; |
| 96 | } |
| 97 | |
| 98 | ExifParser parser = ExifParser.parse(is, flag, mInterface); |
| 99 | int event = parser.next(); |
| 100 | IfdData currIfd = null; |
| 101 | while (event != ExifParser.EVENT_END) { |
| 102 | switch (event) { |
| 103 | case ExifParser.EVENT_START_OF_IFD: |
| 104 | currIfd = ifdDatas[parser.getCurrentIfd()]; |
| 105 | if (currIfd == null) { |
| 106 | parser.skipRemainingTagsInCurrentIfd(); |
| 107 | } |
| 108 | break; |
| 109 | case ExifParser.EVENT_NEW_TAG: |
| 110 | ExifTag oldTag = parser.getTag(); |
| 111 | ExifTag newTag = currIfd.getTag(oldTag.getTagId()); |
| 112 | if (newTag != null) { |
| 113 | if (newTag.getComponentCount() != oldTag.getComponentCount() |
| 114 | || newTag.getDataType() != oldTag.getDataType()) { |
| 115 | return false; |
| 116 | } else { |
| 117 | mTagOffsets.add(new TagOffset(newTag, oldTag.getOffset())); |
| 118 | currIfd.removeTag(oldTag.getTagId()); |
| 119 | if (currIfd.getTagCount() == 0) { |
| 120 | parser.skipRemainingTagsInCurrentIfd(); |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | break; |
| 125 | } |
| 126 | event = parser.next(); |
| 127 | } |
| 128 | for (IfdData ifd : ifdDatas) { |
| 129 | if (ifd != null && ifd.getTagCount() > 0) { |
| 130 | return false; |
| 131 | } |
| 132 | } |
| 133 | modify(); |
| 134 | } finally { |
| 135 | ExifInterface.closeSilently(is); |
| 136 | } |
| 137 | return true; |
| 138 | } |
| 139 | |
| 140 | private void modify() { |
| 141 | mByteBuffer.order(getByteOrder()); |
| 142 | for (TagOffset tagOffset : mTagOffsets) { |
| 143 | writeTagValue(tagOffset.mTag, tagOffset.mOffset); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | private void writeTagValue(ExifTag tag, int offset) { |
| 148 | if (DEBUG) { |
| 149 | Log.v(TAG, "modifying tag to: \n" + tag.toString()); |
| 150 | Log.v(TAG, "at offset: " + offset); |
| 151 | } |
| 152 | mByteBuffer.position(offset + mOffsetBase); |
| 153 | switch (tag.getDataType()) { |
| 154 | case ExifTag.TYPE_ASCII: |
| 155 | byte buf[] = tag.getStringByte(); |
| 156 | if (buf.length == tag.getComponentCount()) { |
| 157 | buf[buf.length - 1] = 0; |
| 158 | mByteBuffer.put(buf); |
| 159 | } else { |
| 160 | mByteBuffer.put(buf); |
| 161 | mByteBuffer.put((byte) 0); |
| 162 | } |
| 163 | break; |
| 164 | case ExifTag.TYPE_LONG: |
| 165 | case ExifTag.TYPE_UNSIGNED_LONG: |
| 166 | for (int i = 0, n = tag.getComponentCount(); i < n; i++) { |
| 167 | mByteBuffer.putInt((int) tag.getValueAt(i)); |
| 168 | } |
| 169 | break; |
| 170 | case ExifTag.TYPE_RATIONAL: |
| 171 | case ExifTag.TYPE_UNSIGNED_RATIONAL: |
| 172 | for (int i = 0, n = tag.getComponentCount(); i < n; i++) { |
| 173 | Rational v = tag.getRational(i); |
| 174 | mByteBuffer.putInt((int) v.getNumerator()); |
| 175 | mByteBuffer.putInt((int) v.getDenominator()); |
| 176 | } |
| 177 | break; |
| 178 | case ExifTag.TYPE_UNDEFINED: |
| 179 | case ExifTag.TYPE_UNSIGNED_BYTE: |
| 180 | buf = new byte[tag.getComponentCount()]; |
| 181 | tag.getBytes(buf); |
| 182 | mByteBuffer.put(buf); |
| 183 | break; |
| 184 | case ExifTag.TYPE_UNSIGNED_SHORT: |
| 185 | for (int i = 0, n = tag.getComponentCount(); i < n; i++) { |
| 186 | mByteBuffer.putShort((short) tag.getValueAt(i)); |
| 187 | } |
| 188 | break; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | public void modifyTag(ExifTag tag) { |
| 193 | mTagToModified.addTag(tag); |
| 194 | } |
| 195 | } |