Michael Jurka
349 lines
9.7 KiB
Java
349 lines
9.7 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.gallery3d.exif;
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import android.util.Log;
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import java.io.UnsupportedEncodingException;
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import java.nio.ByteOrder;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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/**
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* This class stores the EXIF header in IFDs according to the JPEG
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* specification. It is the result produced by {@link ExifReader}.
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*
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* @see ExifReader
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* @see IfdData
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*/
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class ExifData {
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private static final String TAG = "ExifData";
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private static final byte[] USER_COMMENT_ASCII = {
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0x41, 0x53, 0x43, 0x49, 0x49, 0x00, 0x00, 0x00
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};
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private static final byte[] USER_COMMENT_JIS = {
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0x4A, 0x49, 0x53, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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private static final byte[] USER_COMMENT_UNICODE = {
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0x55, 0x4E, 0x49, 0x43, 0x4F, 0x44, 0x45, 0x00
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};
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private final IfdData[] mIfdDatas = new IfdData[IfdId.TYPE_IFD_COUNT];
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private byte[] mThumbnail;
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private ArrayList<byte[]> mStripBytes = new ArrayList<byte[]>();
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private final ByteOrder mByteOrder;
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ExifData(ByteOrder order) {
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mByteOrder = order;
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}
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/**
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* Gets the compressed thumbnail. Returns null if there is no compressed
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* thumbnail.
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*
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* @see #hasCompressedThumbnail()
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*/
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protected byte[] getCompressedThumbnail() {
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return mThumbnail;
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}
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/**
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* Sets the compressed thumbnail.
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*/
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protected void setCompressedThumbnail(byte[] thumbnail) {
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mThumbnail = thumbnail;
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}
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/**
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* Returns true it this header contains a compressed thumbnail.
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*/
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protected boolean hasCompressedThumbnail() {
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return mThumbnail != null;
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}
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/**
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* Adds an uncompressed strip.
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*/
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protected void setStripBytes(int index, byte[] strip) {
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if (index < mStripBytes.size()) {
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mStripBytes.set(index, strip);
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} else {
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for (int i = mStripBytes.size(); i < index; i++) {
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mStripBytes.add(null);
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}
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mStripBytes.add(strip);
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}
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}
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/**
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* Gets the strip count.
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*/
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protected int getStripCount() {
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return mStripBytes.size();
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}
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/**
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* Gets the strip at the specified index.
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*
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* @exceptions #IndexOutOfBoundException
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*/
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protected byte[] getStrip(int index) {
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return mStripBytes.get(index);
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}
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/**
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* Returns true if this header contains uncompressed strip.
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*/
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protected boolean hasUncompressedStrip() {
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return mStripBytes.size() != 0;
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}
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/**
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* Gets the byte order.
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*/
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protected ByteOrder getByteOrder() {
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return mByteOrder;
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}
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/**
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* Returns the {@link IfdData} object corresponding to a given IFD if it
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* exists or null.
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*/
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protected IfdData getIfdData(int ifdId) {
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if (ExifTag.isValidIfd(ifdId)) {
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return mIfdDatas[ifdId];
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}
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return null;
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}
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/**
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* Adds IFD data. If IFD data of the same type already exists, it will be
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* replaced by the new data.
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*/
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protected void addIfdData(IfdData data) {
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mIfdDatas[data.getId()] = data;
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}
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/**
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* Returns the {@link IfdData} object corresponding to a given IFD or
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* generates one if none exist.
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*/
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protected IfdData getOrCreateIfdData(int ifdId) {
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IfdData ifdData = mIfdDatas[ifdId];
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if (ifdData == null) {
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ifdData = new IfdData(ifdId);
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mIfdDatas[ifdId] = ifdData;
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}
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return ifdData;
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}
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/**
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* Returns the tag with a given TID in the given IFD if the tag exists.
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* Otherwise returns null.
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*/
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protected ExifTag getTag(short tag, int ifd) {
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IfdData ifdData = mIfdDatas[ifd];
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return (ifdData == null) ? null : ifdData.getTag(tag);
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}
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/**
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* Adds the given ExifTag to its default IFD and returns an existing ExifTag
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* with the same TID or null if none exist.
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*/
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protected ExifTag addTag(ExifTag tag) {
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if (tag != null) {
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int ifd = tag.getIfd();
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return addTag(tag, ifd);
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}
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return null;
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}
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/**
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* Adds the given ExifTag to the given IFD and returns an existing ExifTag
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* with the same TID or null if none exist.
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*/
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protected ExifTag addTag(ExifTag tag, int ifdId) {
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if (tag != null && ExifTag.isValidIfd(ifdId)) {
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IfdData ifdData = getOrCreateIfdData(ifdId);
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return ifdData.setTag(tag);
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}
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return null;
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}
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protected void clearThumbnailAndStrips() {
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mThumbnail = null;
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mStripBytes.clear();
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}
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/**
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* Removes the thumbnail and its related tags. IFD1 will be removed.
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*/
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protected void removeThumbnailData() {
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clearThumbnailAndStrips();
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mIfdDatas[IfdId.TYPE_IFD_1] = null;
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}
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/**
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* Removes the tag with a given TID and IFD.
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*/
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protected void removeTag(short tagId, int ifdId) {
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IfdData ifdData = mIfdDatas[ifdId];
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if (ifdData == null) {
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return;
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}
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ifdData.removeTag(tagId);
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}
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/**
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* Decodes the user comment tag into string as specified in the EXIF
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* standard. Returns null if decoding failed.
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*/
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protected String getUserComment() {
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IfdData ifdData = mIfdDatas[IfdId.TYPE_IFD_0];
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if (ifdData == null) {
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return null;
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}
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ExifTag tag = ifdData.getTag(ExifInterface.getTrueTagKey(ExifInterface.TAG_USER_COMMENT));
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if (tag == null) {
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return null;
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}
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if (tag.getComponentCount() < 8) {
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return null;
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}
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byte[] buf = new byte[tag.getComponentCount()];
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tag.getBytes(buf);
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byte[] code = new byte[8];
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System.arraycopy(buf, 0, code, 0, 8);
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try {
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if (Arrays.equals(code, USER_COMMENT_ASCII)) {
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return new String(buf, 8, buf.length - 8, "US-ASCII");
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} else if (Arrays.equals(code, USER_COMMENT_JIS)) {
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return new String(buf, 8, buf.length - 8, "EUC-JP");
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} else if (Arrays.equals(code, USER_COMMENT_UNICODE)) {
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return new String(buf, 8, buf.length - 8, "UTF-16");
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} else {
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return null;
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}
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} catch (UnsupportedEncodingException e) {
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Log.w(TAG, "Failed to decode the user comment");
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return null;
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}
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}
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/**
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* Returns a list of all {@link ExifTag}s in the ExifData or null if there
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* are none.
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*/
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protected List<ExifTag> getAllTags() {
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ArrayList<ExifTag> ret = new ArrayList<ExifTag>();
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for (IfdData d : mIfdDatas) {
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if (d != null) {
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ExifTag[] tags = d.getAllTags();
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if (tags != null) {
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for (ExifTag t : tags) {
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ret.add(t);
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}
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}
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}
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}
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if (ret.size() == 0) {
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return null;
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}
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return ret;
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}
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/**
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* Returns a list of all {@link ExifTag}s in a given IFD or null if there
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* are none.
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*/
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protected List<ExifTag> getAllTagsForIfd(int ifd) {
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IfdData d = mIfdDatas[ifd];
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if (d == null) {
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return null;
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}
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ExifTag[] tags = d.getAllTags();
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if (tags == null) {
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return null;
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}
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ArrayList<ExifTag> ret = new ArrayList<ExifTag>(tags.length);
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for (ExifTag t : tags) {
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ret.add(t);
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}
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if (ret.size() == 0) {
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return null;
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}
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return ret;
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}
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/**
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* Returns a list of all {@link ExifTag}s with a given TID or null if there
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* are none.
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*/
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protected List<ExifTag> getAllTagsForTagId(short tag) {
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ArrayList<ExifTag> ret = new ArrayList<ExifTag>();
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for (IfdData d : mIfdDatas) {
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if (d != null) {
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ExifTag t = d.getTag(tag);
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if (t != null) {
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ret.add(t);
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}
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}
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}
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if (ret.size() == 0) {
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return null;
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}
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return ret;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj == null) {
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return false;
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}
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if (obj instanceof ExifData) {
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ExifData data = (ExifData) obj;
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if (data.mByteOrder != mByteOrder ||
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data.mStripBytes.size() != mStripBytes.size() ||
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!Arrays.equals(data.mThumbnail, mThumbnail)) {
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return false;
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}
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for (int i = 0; i < mStripBytes.size(); i++) {
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if (!Arrays.equals(data.mStripBytes.get(i), mStripBytes.get(i))) {
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return false;
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}
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}
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for (int i = 0; i < IfdId.TYPE_IFD_COUNT; i++) {
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IfdData ifd1 = data.getIfdData(i);
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IfdData ifd2 = getIfdData(i);
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if (ifd1 != ifd2 && ifd1 != null && !ifd1.equals(ifd2)) {
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return false;
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}
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}
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return true;
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}
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return false;
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}
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}
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