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Diffstat (limited to 'WallpaperPicker/src/com/android/gallery3d/exif/ExifParser.java')
-rw-r--r--WallpaperPicker/src/com/android/gallery3d/exif/ExifParser.java916
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diff --git a/WallpaperPicker/src/com/android/gallery3d/exif/ExifParser.java b/WallpaperPicker/src/com/android/gallery3d/exif/ExifParser.java
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+++ b/WallpaperPicker/src/com/android/gallery3d/exif/ExifParser.java
@@ -0,0 +1,916 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.gallery3d.exif;
+
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteOrder;
+import java.nio.charset.Charset;
+import java.util.Map.Entry;
+import java.util.TreeMap;
+
+/**
+ * This class provides a low-level EXIF parsing API. Given a JPEG format
+ * InputStream, the caller can request which IFD's to read via
+ * {@link #parse(InputStream, int)} with given options.
+ * <p>
+ * Below is an example of getting EXIF data from IFD 0 and EXIF IFD using the
+ * parser.
+ *
+ * <pre>
+ * void parse() {
+ * ExifParser parser = ExifParser.parse(mImageInputStream,
+ * ExifParser.OPTION_IFD_0 | ExifParser.OPTIONS_IFD_EXIF);
+ * int event = parser.next();
+ * while (event != ExifParser.EVENT_END) {
+ * switch (event) {
+ * case ExifParser.EVENT_START_OF_IFD:
+ * break;
+ * case ExifParser.EVENT_NEW_TAG:
+ * ExifTag tag = parser.getTag();
+ * if (!tag.hasValue()) {
+ * parser.registerForTagValue(tag);
+ * } else {
+ * processTag(tag);
+ * }
+ * break;
+ * case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG:
+ * tag = parser.getTag();
+ * if (tag.getDataType() != ExifTag.TYPE_UNDEFINED) {
+ * processTag(tag);
+ * }
+ * break;
+ * }
+ * event = parser.next();
+ * }
+ * }
+ *
+ * void processTag(ExifTag tag) {
+ * // process the tag as you like.
+ * }
+ * </pre>
+ */
+class ExifParser {
+ private static final boolean LOGV = false;
+ private static final String TAG = "ExifParser";
+ /**
+ * When the parser reaches a new IFD area. Call {@link #getCurrentIfd()} to
+ * know which IFD we are in.
+ */
+ public static final int EVENT_START_OF_IFD = 0;
+ /**
+ * When the parser reaches a new tag. Call {@link #getTag()}to get the
+ * corresponding tag.
+ */
+ public static final int EVENT_NEW_TAG = 1;
+ /**
+ * When the parser reaches the value area of tag that is registered by
+ * {@link #registerForTagValue(ExifTag)} previously. Call {@link #getTag()}
+ * to get the corresponding tag.
+ */
+ public static final int EVENT_VALUE_OF_REGISTERED_TAG = 2;
+
+ /**
+ * When the parser reaches the compressed image area.
+ */
+ public static final int EVENT_COMPRESSED_IMAGE = 3;
+ /**
+ * When the parser reaches the uncompressed image strip. Call
+ * {@link #getStripIndex()} to get the index of the strip.
+ *
+ * @see #getStripIndex()
+ * @see #getStripCount()
+ */
+ public static final int EVENT_UNCOMPRESSED_STRIP = 4;
+ /**
+ * When there is nothing more to parse.
+ */
+ public static final int EVENT_END = 5;
+
+ /**
+ * Option bit to request to parse IFD0.
+ */
+ public static final int OPTION_IFD_0 = 1 << 0;
+ /**
+ * Option bit to request to parse IFD1.
+ */
+ public static final int OPTION_IFD_1 = 1 << 1;
+ /**
+ * Option bit to request to parse Exif-IFD.
+ */
+ public static final int OPTION_IFD_EXIF = 1 << 2;
+ /**
+ * Option bit to request to parse GPS-IFD.
+ */
+ public static final int OPTION_IFD_GPS = 1 << 3;
+ /**
+ * Option bit to request to parse Interoperability-IFD.
+ */
+ public static final int OPTION_IFD_INTEROPERABILITY = 1 << 4;
+ /**
+ * Option bit to request to parse thumbnail.
+ */
+ public static final int OPTION_THUMBNAIL = 1 << 5;
+
+ protected static final int EXIF_HEADER = 0x45786966; // EXIF header "Exif"
+ protected static final short EXIF_HEADER_TAIL = (short) 0x0000; // EXIF header in APP1
+
+ // TIFF header
+ protected static final short LITTLE_ENDIAN_TAG = (short) 0x4949; // "II"
+ protected static final short BIG_ENDIAN_TAG = (short) 0x4d4d; // "MM"
+ protected static final short TIFF_HEADER_TAIL = 0x002A;
+
+ protected static final int TAG_SIZE = 12;
+ protected static final int OFFSET_SIZE = 2;
+
+ private static final Charset US_ASCII = Charset.forName("US-ASCII");
+
+ protected static final int DEFAULT_IFD0_OFFSET = 8;
+
+ private final CountedDataInputStream mTiffStream;
+ private final int mOptions;
+ private int mIfdStartOffset = 0;
+ private int mNumOfTagInIfd = 0;
+ private int mIfdType;
+ private ExifTag mTag;
+ private ImageEvent mImageEvent;
+ private int mStripCount;
+ private ExifTag mStripSizeTag;
+ private ExifTag mJpegSizeTag;
+ private boolean mNeedToParseOffsetsInCurrentIfd;
+ private boolean mContainExifData = false;
+ private int mApp1End;
+ private int mOffsetToApp1EndFromSOF = 0;
+ private byte[] mDataAboveIfd0;
+ private int mIfd0Position;
+ private int mTiffStartPosition;
+ private final ExifInterface mInterface;
+
+ private static final short TAG_EXIF_IFD = ExifInterface
+ .getTrueTagKey(ExifInterface.TAG_EXIF_IFD);
+ private static final short TAG_GPS_IFD = ExifInterface.getTrueTagKey(ExifInterface.TAG_GPS_IFD);
+ private static final short TAG_INTEROPERABILITY_IFD = ExifInterface
+ .getTrueTagKey(ExifInterface.TAG_INTEROPERABILITY_IFD);
+ private static final short TAG_JPEG_INTERCHANGE_FORMAT = ExifInterface
+ .getTrueTagKey(ExifInterface.TAG_JPEG_INTERCHANGE_FORMAT);
+ private static final short TAG_JPEG_INTERCHANGE_FORMAT_LENGTH = ExifInterface
+ .getTrueTagKey(ExifInterface.TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
+ private static final short TAG_STRIP_OFFSETS = ExifInterface
+ .getTrueTagKey(ExifInterface.TAG_STRIP_OFFSETS);
+ private static final short TAG_STRIP_BYTE_COUNTS = ExifInterface
+ .getTrueTagKey(ExifInterface.TAG_STRIP_BYTE_COUNTS);
+
+ private final TreeMap<Integer, Object> mCorrespondingEvent = new TreeMap<Integer, Object>();
+
+ private boolean isIfdRequested(int ifdType) {
+ switch (ifdType) {
+ case IfdId.TYPE_IFD_0:
+ return (mOptions & OPTION_IFD_0) != 0;
+ case IfdId.TYPE_IFD_1:
+ return (mOptions & OPTION_IFD_1) != 0;
+ case IfdId.TYPE_IFD_EXIF:
+ return (mOptions & OPTION_IFD_EXIF) != 0;
+ case IfdId.TYPE_IFD_GPS:
+ return (mOptions & OPTION_IFD_GPS) != 0;
+ case IfdId.TYPE_IFD_INTEROPERABILITY:
+ return (mOptions & OPTION_IFD_INTEROPERABILITY) != 0;
+ }
+ return false;
+ }
+
+ private boolean isThumbnailRequested() {
+ return (mOptions & OPTION_THUMBNAIL) != 0;
+ }
+
+ private ExifParser(InputStream inputStream, int options, ExifInterface iRef)
+ throws IOException, ExifInvalidFormatException {
+ if (inputStream == null) {
+ throw new IOException("Null argument inputStream to ExifParser");
+ }
+ if (LOGV) {
+ Log.v(TAG, "Reading exif...");
+ }
+ mInterface = iRef;
+ mContainExifData = seekTiffData(inputStream);
+ mTiffStream = new CountedDataInputStream(inputStream);
+ mOptions = options;
+ if (!mContainExifData) {
+ return;
+ }
+
+ parseTiffHeader();
+ long offset = mTiffStream.readUnsignedInt();
+ if (offset > Integer.MAX_VALUE) {
+ throw new ExifInvalidFormatException("Invalid offset " + offset);
+ }
+ mIfd0Position = (int) offset;
+ mIfdType = IfdId.TYPE_IFD_0;
+ if (isIfdRequested(IfdId.TYPE_IFD_0) || needToParseOffsetsInCurrentIfd()) {
+ registerIfd(IfdId.TYPE_IFD_0, offset);
+ if (offset != DEFAULT_IFD0_OFFSET) {
+ mDataAboveIfd0 = new byte[(int) offset - DEFAULT_IFD0_OFFSET];
+ read(mDataAboveIfd0);
+ }
+ }
+ }
+
+ /**
+ * Parses the the given InputStream with the given options
+ *
+ * @exception IOException
+ * @exception ExifInvalidFormatException
+ */
+ protected static ExifParser parse(InputStream inputStream, int options, ExifInterface iRef)
+ throws IOException, ExifInvalidFormatException {
+ return new ExifParser(inputStream, options, iRef);
+ }
+
+ /**
+ * Parses the the given InputStream with default options; that is, every IFD
+ * and thumbnaill will be parsed.
+ *
+ * @exception IOException
+ * @exception ExifInvalidFormatException
+ * @see #parse(InputStream, int)
+ */
+ protected static ExifParser parse(InputStream inputStream, ExifInterface iRef)
+ throws IOException, ExifInvalidFormatException {
+ return new ExifParser(inputStream, OPTION_IFD_0 | OPTION_IFD_1
+ | OPTION_IFD_EXIF | OPTION_IFD_GPS | OPTION_IFD_INTEROPERABILITY
+ | OPTION_THUMBNAIL, iRef);
+ }
+
+ /**
+ * Moves the parser forward and returns the next parsing event
+ *
+ * @exception IOException
+ * @exception ExifInvalidFormatException
+ * @see #EVENT_START_OF_IFD
+ * @see #EVENT_NEW_TAG
+ * @see #EVENT_VALUE_OF_REGISTERED_TAG
+ * @see #EVENT_COMPRESSED_IMAGE
+ * @see #EVENT_UNCOMPRESSED_STRIP
+ * @see #EVENT_END
+ */
+ protected int next() throws IOException, ExifInvalidFormatException {
+ if (!mContainExifData) {
+ return EVENT_END;
+ }
+ int offset = mTiffStream.getReadByteCount();
+ int endOfTags = mIfdStartOffset + OFFSET_SIZE + TAG_SIZE * mNumOfTagInIfd;
+ if (offset < endOfTags) {
+ mTag = readTag();
+ if (mTag == null) {
+ return next();
+ }
+ if (mNeedToParseOffsetsInCurrentIfd) {
+ checkOffsetOrImageTag(mTag);
+ }
+ return EVENT_NEW_TAG;
+ } else if (offset == endOfTags) {
+ // There is a link to ifd1 at the end of ifd0
+ if (mIfdType == IfdId.TYPE_IFD_0) {
+ long ifdOffset = readUnsignedLong();
+ if (isIfdRequested(IfdId.TYPE_IFD_1) || isThumbnailRequested()) {
+ if (ifdOffset != 0) {
+ registerIfd(IfdId.TYPE_IFD_1, ifdOffset);
+ }
+ }
+ } else {
+ int offsetSize = 4;
+ // Some camera models use invalid length of the offset
+ if (mCorrespondingEvent.size() > 0) {
+ offsetSize = mCorrespondingEvent.firstEntry().getKey() -
+ mTiffStream.getReadByteCount();
+ }
+ if (offsetSize < 4) {
+ Log.w(TAG, "Invalid size of link to next IFD: " + offsetSize);
+ } else {
+ long ifdOffset = readUnsignedLong();
+ if (ifdOffset != 0) {
+ Log.w(TAG, "Invalid link to next IFD: " + ifdOffset);
+ }
+ }
+ }
+ }
+ while (mCorrespondingEvent.size() != 0) {
+ Entry<Integer, Object> entry = mCorrespondingEvent.pollFirstEntry();
+ Object event = entry.getValue();
+ try {
+ skipTo(entry.getKey());
+ } catch (IOException e) {
+ Log.w(TAG, "Failed to skip to data at: " + entry.getKey() +
+ " for " + event.getClass().getName() + ", the file may be broken.");
+ continue;
+ }
+ if (event instanceof IfdEvent) {
+ mIfdType = ((IfdEvent) event).ifd;
+ mNumOfTagInIfd = mTiffStream.readUnsignedShort();
+ mIfdStartOffset = entry.getKey();
+
+ if (mNumOfTagInIfd * TAG_SIZE + mIfdStartOffset + OFFSET_SIZE > mApp1End) {
+ Log.w(TAG, "Invalid size of IFD " + mIfdType);
+ return EVENT_END;
+ }
+
+ mNeedToParseOffsetsInCurrentIfd = needToParseOffsetsInCurrentIfd();
+ if (((IfdEvent) event).isRequested) {
+ return EVENT_START_OF_IFD;
+ } else {
+ skipRemainingTagsInCurrentIfd();
+ }
+ } else if (event instanceof ImageEvent) {
+ mImageEvent = (ImageEvent) event;
+ return mImageEvent.type;
+ } else {
+ ExifTagEvent tagEvent = (ExifTagEvent) event;
+ mTag = tagEvent.tag;
+ if (mTag.getDataType() != ExifTag.TYPE_UNDEFINED) {
+ readFullTagValue(mTag);
+ checkOffsetOrImageTag(mTag);
+ }
+ if (tagEvent.isRequested) {
+ return EVENT_VALUE_OF_REGISTERED_TAG;
+ }
+ }
+ }
+ return EVENT_END;
+ }
+
+ /**
+ * Skips the tags area of current IFD, if the parser is not in the tag area,
+ * nothing will happen.
+ *
+ * @throws IOException
+ * @throws ExifInvalidFormatException
+ */
+ protected void skipRemainingTagsInCurrentIfd() throws IOException, ExifInvalidFormatException {
+ int endOfTags = mIfdStartOffset + OFFSET_SIZE + TAG_SIZE * mNumOfTagInIfd;
+ int offset = mTiffStream.getReadByteCount();
+ if (offset > endOfTags) {
+ return;
+ }
+ if (mNeedToParseOffsetsInCurrentIfd) {
+ while (offset < endOfTags) {
+ mTag = readTag();
+ offset += TAG_SIZE;
+ if (mTag == null) {
+ continue;
+ }
+ checkOffsetOrImageTag(mTag);
+ }
+ } else {
+ skipTo(endOfTags);
+ }
+ long ifdOffset = readUnsignedLong();
+ // For ifd0, there is a link to ifd1 in the end of all tags
+ if (mIfdType == IfdId.TYPE_IFD_0
+ && (isIfdRequested(IfdId.TYPE_IFD_1) || isThumbnailRequested())) {
+ if (ifdOffset > 0) {
+ registerIfd(IfdId.TYPE_IFD_1, ifdOffset);
+ }
+ }
+ }
+
+ private boolean needToParseOffsetsInCurrentIfd() {
+ switch (mIfdType) {
+ case IfdId.TYPE_IFD_0:
+ return isIfdRequested(IfdId.TYPE_IFD_EXIF) || isIfdRequested(IfdId.TYPE_IFD_GPS)
+ || isIfdRequested(IfdId.TYPE_IFD_INTEROPERABILITY)
+ || isIfdRequested(IfdId.TYPE_IFD_1);
+ case IfdId.TYPE_IFD_1:
+ return isThumbnailRequested();
+ case IfdId.TYPE_IFD_EXIF:
+ // The offset to interoperability IFD is located in Exif IFD
+ return isIfdRequested(IfdId.TYPE_IFD_INTEROPERABILITY);
+ default:
+ return false;
+ }
+ }
+
+ /**
+ * If {@link #next()} return {@link #EVENT_NEW_TAG} or
+ * {@link #EVENT_VALUE_OF_REGISTERED_TAG}, call this function to get the
+ * corresponding tag.
+ * <p>
+ * For {@link #EVENT_NEW_TAG}, the tag may not contain the value if the size
+ * of the value is greater than 4 bytes. One should call
+ * {@link ExifTag#hasValue()} to check if the tag contains value. If there
+ * is no value,call {@link #registerForTagValue(ExifTag)} to have the parser
+ * emit {@link #EVENT_VALUE_OF_REGISTERED_TAG} when it reaches the area
+ * pointed by the offset.
+ * <p>
+ * When {@link #EVENT_VALUE_OF_REGISTERED_TAG} is emitted, the value of the
+ * tag will have already been read except for tags of undefined type. For
+ * tags of undefined type, call one of the read methods to get the value.
+ *
+ * @see #registerForTagValue(ExifTag)
+ * @see #read(byte[])
+ * @see #read(byte[], int, int)
+ * @see #readLong()
+ * @see #readRational()
+ * @see #readString(int)
+ * @see #readString(int, Charset)
+ */
+ protected ExifTag getTag() {
+ return mTag;
+ }
+
+ /**
+ * Gets number of tags in the current IFD area.
+ */
+ protected int getTagCountInCurrentIfd() {
+ return mNumOfTagInIfd;
+ }
+
+ /**
+ * Gets the ID of current IFD.
+ *
+ * @see IfdId#TYPE_IFD_0
+ * @see IfdId#TYPE_IFD_1
+ * @see IfdId#TYPE_IFD_GPS
+ * @see IfdId#TYPE_IFD_INTEROPERABILITY
+ * @see IfdId#TYPE_IFD_EXIF
+ */
+ protected int getCurrentIfd() {
+ return mIfdType;
+ }
+
+ /**
+ * When receiving {@link #EVENT_UNCOMPRESSED_STRIP}, call this function to
+ * get the index of this strip.
+ *
+ * @see #getStripCount()
+ */
+ protected int getStripIndex() {
+ return mImageEvent.stripIndex;
+ }
+
+ /**
+ * When receiving {@link #EVENT_UNCOMPRESSED_STRIP}, call this function to
+ * get the number of strip data.
+ *
+ * @see #getStripIndex()
+ */
+ protected int getStripCount() {
+ return mStripCount;
+ }
+
+ /**
+ * When receiving {@link #EVENT_UNCOMPRESSED_STRIP}, call this function to
+ * get the strip size.
+ */
+ protected int getStripSize() {
+ if (mStripSizeTag == null)
+ return 0;
+ return (int) mStripSizeTag.getValueAt(0);
+ }
+
+ /**
+ * When receiving {@link #EVENT_COMPRESSED_IMAGE}, call this function to get
+ * the image data size.
+ */
+ protected int getCompressedImageSize() {
+ if (mJpegSizeTag == null) {
+ return 0;
+ }
+ return (int) mJpegSizeTag.getValueAt(0);
+ }
+
+ private void skipTo(int offset) throws IOException {
+ mTiffStream.skipTo(offset);
+ while (!mCorrespondingEvent.isEmpty() && mCorrespondingEvent.firstKey() < offset) {
+ mCorrespondingEvent.pollFirstEntry();
+ }
+ }
+
+ /**
+ * When getting {@link #EVENT_NEW_TAG} in the tag area of IFD, the tag may
+ * not contain the value if the size of the value is greater than 4 bytes.
+ * When the value is not available here, call this method so that the parser
+ * will emit {@link #EVENT_VALUE_OF_REGISTERED_TAG} when it reaches the area
+ * where the value is located.
+ *
+ * @see #EVENT_VALUE_OF_REGISTERED_TAG
+ */
+ protected void registerForTagValue(ExifTag tag) {
+ if (tag.getOffset() >= mTiffStream.getReadByteCount()) {
+ mCorrespondingEvent.put(tag.getOffset(), new ExifTagEvent(tag, true));
+ }
+ }
+
+ private void registerIfd(int ifdType, long offset) {
+ // Cast unsigned int to int since the offset is always smaller
+ // than the size of APP1 (65536)
+ mCorrespondingEvent.put((int) offset, new IfdEvent(ifdType, isIfdRequested(ifdType)));
+ }
+
+ private void registerCompressedImage(long offset) {
+ mCorrespondingEvent.put((int) offset, new ImageEvent(EVENT_COMPRESSED_IMAGE));
+ }
+
+ private void registerUncompressedStrip(int stripIndex, long offset) {
+ mCorrespondingEvent.put((int) offset, new ImageEvent(EVENT_UNCOMPRESSED_STRIP
+ , stripIndex));
+ }
+
+ private ExifTag readTag() throws IOException, ExifInvalidFormatException {
+ short tagId = mTiffStream.readShort();
+ short dataFormat = mTiffStream.readShort();
+ long numOfComp = mTiffStream.readUnsignedInt();
+ if (numOfComp > Integer.MAX_VALUE) {
+ throw new ExifInvalidFormatException(
+ "Number of component is larger then Integer.MAX_VALUE");
+ }
+ // Some invalid image file contains invalid data type. Ignore those tags
+ if (!ExifTag.isValidType(dataFormat)) {
+ Log.w(TAG, String.format("Tag %04x: Invalid data type %d", tagId, dataFormat));
+ mTiffStream.skip(4);
+ return null;
+ }
+ // TODO: handle numOfComp overflow
+ ExifTag tag = new ExifTag(tagId, dataFormat, (int) numOfComp, mIfdType,
+ ((int) numOfComp) != ExifTag.SIZE_UNDEFINED);
+ int dataSize = tag.getDataSize();
+ if (dataSize > 4) {
+ long offset = mTiffStream.readUnsignedInt();
+ if (offset > Integer.MAX_VALUE) {
+ throw new ExifInvalidFormatException(
+ "offset is larger then Integer.MAX_VALUE");
+ }
+ // Some invalid images put some undefined data before IFD0.
+ // Read the data here.
+ if ((offset < mIfd0Position) && (dataFormat == ExifTag.TYPE_UNDEFINED)) {
+ byte[] buf = new byte[(int) numOfComp];
+ System.arraycopy(mDataAboveIfd0, (int) offset - DEFAULT_IFD0_OFFSET,
+ buf, 0, (int) numOfComp);
+ tag.setValue(buf);
+ } else {
+ tag.setOffset((int) offset);
+ }
+ } else {
+ boolean defCount = tag.hasDefinedCount();
+ // Set defined count to 0 so we can add \0 to non-terminated strings
+ tag.setHasDefinedCount(false);
+ // Read value
+ readFullTagValue(tag);
+ tag.setHasDefinedCount(defCount);
+ mTiffStream.skip(4 - dataSize);
+ // Set the offset to the position of value.
+ tag.setOffset(mTiffStream.getReadByteCount() - 4);
+ }
+ return tag;
+ }
+
+ /**
+ * Check the tag, if the tag is one of the offset tag that points to the IFD
+ * or image the caller is interested in, register the IFD or image.
+ */
+ private void checkOffsetOrImageTag(ExifTag tag) {
+ // Some invalid formattd image contains tag with 0 size.
+ if (tag.getComponentCount() == 0) {
+ return;
+ }
+ short tid = tag.getTagId();
+ int ifd = tag.getIfd();
+ if (tid == TAG_EXIF_IFD && checkAllowed(ifd, ExifInterface.TAG_EXIF_IFD)) {
+ if (isIfdRequested(IfdId.TYPE_IFD_EXIF)
+ || isIfdRequested(IfdId.TYPE_IFD_INTEROPERABILITY)) {
+ registerIfd(IfdId.TYPE_IFD_EXIF, tag.getValueAt(0));
+ }
+ } else if (tid == TAG_GPS_IFD && checkAllowed(ifd, ExifInterface.TAG_GPS_IFD)) {
+ if (isIfdRequested(IfdId.TYPE_IFD_GPS)) {
+ registerIfd(IfdId.TYPE_IFD_GPS, tag.getValueAt(0));
+ }
+ } else if (tid == TAG_INTEROPERABILITY_IFD
+ && checkAllowed(ifd, ExifInterface.TAG_INTEROPERABILITY_IFD)) {
+ if (isIfdRequested(IfdId.TYPE_IFD_INTEROPERABILITY)) {
+ registerIfd(IfdId.TYPE_IFD_INTEROPERABILITY, tag.getValueAt(0));
+ }
+ } else if (tid == TAG_JPEG_INTERCHANGE_FORMAT
+ && checkAllowed(ifd, ExifInterface.TAG_JPEG_INTERCHANGE_FORMAT)) {
+ if (isThumbnailRequested()) {
+ registerCompressedImage(tag.getValueAt(0));
+ }
+ } else if (tid == TAG_JPEG_INTERCHANGE_FORMAT_LENGTH
+ && checkAllowed(ifd, ExifInterface.TAG_JPEG_INTERCHANGE_FORMAT_LENGTH)) {
+ if (isThumbnailRequested()) {
+ mJpegSizeTag = tag;
+ }
+ } else if (tid == TAG_STRIP_OFFSETS && checkAllowed(ifd, ExifInterface.TAG_STRIP_OFFSETS)) {
+ if (isThumbnailRequested()) {
+ if (tag.hasValue()) {
+ for (int i = 0; i < tag.getComponentCount(); i++) {
+ if (tag.getDataType() == ExifTag.TYPE_UNSIGNED_SHORT) {
+ registerUncompressedStrip(i, tag.getValueAt(i));
+ } else {
+ registerUncompressedStrip(i, tag.getValueAt(i));
+ }
+ }
+ } else {
+ mCorrespondingEvent.put(tag.getOffset(), new ExifTagEvent(tag, false));
+ }
+ }
+ } else if (tid == TAG_STRIP_BYTE_COUNTS
+ && checkAllowed(ifd, ExifInterface.TAG_STRIP_BYTE_COUNTS)
+ &&isThumbnailRequested() && tag.hasValue()) {
+ mStripSizeTag = tag;
+ }
+ }
+
+ private boolean checkAllowed(int ifd, int tagId) {
+ int info = mInterface.getTagInfo().get(tagId);
+ if (info == ExifInterface.DEFINITION_NULL) {
+ return false;
+ }
+ return ExifInterface.isIfdAllowed(info, ifd);
+ }
+
+ protected void readFullTagValue(ExifTag tag) throws IOException {
+ // Some invalid images contains tags with wrong size, check it here
+ short type = tag.getDataType();
+ if (type == ExifTag.TYPE_ASCII || type == ExifTag.TYPE_UNDEFINED ||
+ type == ExifTag.TYPE_UNSIGNED_BYTE) {
+ int size = tag.getComponentCount();
+ if (mCorrespondingEvent.size() > 0) {
+ if (mCorrespondingEvent.firstEntry().getKey() < mTiffStream.getReadByteCount()
+ + size) {
+ Object event = mCorrespondingEvent.firstEntry().getValue();
+ if (event instanceof ImageEvent) {
+ // Tag value overlaps thumbnail, ignore thumbnail.
+ Log.w(TAG, "Thumbnail overlaps value for tag: \n" + tag.toString());
+ Entry<Integer, Object> entry = mCorrespondingEvent.pollFirstEntry();
+ Log.w(TAG, "Invalid thumbnail offset: " + entry.getKey());
+ } else {
+ // Tag value overlaps another tag, shorten count
+ if (event instanceof IfdEvent) {
+ Log.w(TAG, "Ifd " + ((IfdEvent) event).ifd
+ + " overlaps value for tag: \n" + tag.toString());
+ } else if (event instanceof ExifTagEvent) {
+ Log.w(TAG, "Tag value for tag: \n"
+ + ((ExifTagEvent) event).tag.toString()
+ + " overlaps value for tag: \n" + tag.toString());
+ }
+ size = mCorrespondingEvent.firstEntry().getKey()
+ - mTiffStream.getReadByteCount();
+ Log.w(TAG, "Invalid size of tag: \n" + tag.toString()
+ + " setting count to: " + size);
+ tag.forceSetComponentCount(size);
+ }
+ }
+ }
+ }
+ switch (tag.getDataType()) {
+ case ExifTag.TYPE_UNSIGNED_BYTE:
+ case ExifTag.TYPE_UNDEFINED: {
+ byte buf[] = new byte[tag.getComponentCount()];
+ read(buf);
+ tag.setValue(buf);
+ }
+ break;
+ case ExifTag.TYPE_ASCII:
+ tag.setValue(readString(tag.getComponentCount()));
+ break;
+ case ExifTag.TYPE_UNSIGNED_LONG: {
+ long value[] = new long[tag.getComponentCount()];
+ for (int i = 0, n = value.length; i < n; i++) {
+ value[i] = readUnsignedLong();
+ }
+ tag.setValue(value);
+ }
+ break;
+ case ExifTag.TYPE_UNSIGNED_RATIONAL: {
+ Rational value[] = new Rational[tag.getComponentCount()];
+ for (int i = 0, n = value.length; i < n; i++) {
+ value[i] = readUnsignedRational();
+ }
+ tag.setValue(value);
+ }
+ break;
+ case ExifTag.TYPE_UNSIGNED_SHORT: {
+ int value[] = new int[tag.getComponentCount()];
+ for (int i = 0, n = value.length; i < n; i++) {
+ value[i] = readUnsignedShort();
+ }
+ tag.setValue(value);
+ }
+ break;
+ case ExifTag.TYPE_LONG: {
+ int value[] = new int[tag.getComponentCount()];
+ for (int i = 0, n = value.length; i < n; i++) {
+ value[i] = readLong();
+ }
+ tag.setValue(value);
+ }
+ break;
+ case ExifTag.TYPE_RATIONAL: {
+ Rational value[] = new Rational[tag.getComponentCount()];
+ for (int i = 0, n = value.length; i < n; i++) {
+ value[i] = readRational();
+ }
+ tag.setValue(value);
+ }
+ break;
+ }
+ if (LOGV) {
+ Log.v(TAG, "\n" + tag.toString());
+ }
+ }
+
+ private void parseTiffHeader() throws IOException,
+ ExifInvalidFormatException {
+ short byteOrder = mTiffStream.readShort();
+ if (LITTLE_ENDIAN_TAG == byteOrder) {
+ mTiffStream.setByteOrder(ByteOrder.LITTLE_ENDIAN);
+ } else if (BIG_ENDIAN_TAG == byteOrder) {
+ mTiffStream.setByteOrder(ByteOrder.BIG_ENDIAN);
+ } else {
+ throw new ExifInvalidFormatException("Invalid TIFF header");
+ }
+
+ if (mTiffStream.readShort() != TIFF_HEADER_TAIL) {
+ throw new ExifInvalidFormatException("Invalid TIFF header");
+ }
+ }
+
+ private boolean seekTiffData(InputStream inputStream) throws IOException,
+ ExifInvalidFormatException {
+ CountedDataInputStream dataStream = new CountedDataInputStream(inputStream);
+ if (dataStream.readShort() != JpegHeader.SOI) {
+ throw new ExifInvalidFormatException("Invalid JPEG format");
+ }
+
+ short marker = dataStream.readShort();
+ while (marker != JpegHeader.EOI
+ && !JpegHeader.isSofMarker(marker)) {
+ int length = dataStream.readUnsignedShort();
+ // Some invalid formatted image contains multiple APP1,
+ // try to find the one with Exif data.
+ if (marker == JpegHeader.APP1) {
+ int header = 0;
+ short headerTail = 0;
+ if (length >= 8) {
+ header = dataStream.readInt();
+ headerTail = dataStream.readShort();
+ length -= 6;
+ if (header == EXIF_HEADER && headerTail == EXIF_HEADER_TAIL) {
+ mTiffStartPosition = dataStream.getReadByteCount();
+ mApp1End = length;
+ mOffsetToApp1EndFromSOF = mTiffStartPosition + mApp1End;
+ return true;
+ }
+ }
+ }
+ if (length < 2 || (length - 2) != dataStream.skip(length - 2)) {
+ Log.w(TAG, "Invalid JPEG format.");
+ return false;
+ }
+ marker = dataStream.readShort();
+ }
+ return false;
+ }
+
+ protected int getOffsetToExifEndFromSOF() {
+ return mOffsetToApp1EndFromSOF;
+ }
+
+ protected int getTiffStartPosition() {
+ return mTiffStartPosition;
+ }
+
+ /**
+ * Reads bytes from the InputStream.
+ */
+ protected int read(byte[] buffer, int offset, int length) throws IOException {
+ return mTiffStream.read(buffer, offset, length);
+ }
+
+ /**
+ * Equivalent to read(buffer, 0, buffer.length).
+ */
+ protected int read(byte[] buffer) throws IOException {
+ return mTiffStream.read(buffer);
+ }
+
+ /**
+ * Reads a String from the InputStream with US-ASCII charset. The parser
+ * will read n bytes and convert it to ascii string. This is used for
+ * reading values of type {@link ExifTag#TYPE_ASCII}.
+ */
+ protected String readString(int n) throws IOException {
+ return readString(n, US_ASCII);
+ }
+
+ /**
+ * Reads a String from the InputStream with the given charset. The parser
+ * will read n bytes and convert it to string. This is used for reading
+ * values of type {@link ExifTag#TYPE_ASCII}.
+ */
+ protected String readString(int n, Charset charset) throws IOException {
+ if (n > 0) {
+ return mTiffStream.readString(n, charset);
+ } else {
+ return "";
+ }
+ }
+
+ /**
+ * Reads value of type {@link ExifTag#TYPE_UNSIGNED_SHORT} from the
+ * InputStream.
+ */
+ protected int readUnsignedShort() throws IOException {
+ return mTiffStream.readShort() & 0xffff;
+ }
+
+ /**
+ * Reads value of type {@link ExifTag#TYPE_UNSIGNED_LONG} from the
+ * InputStream.
+ */
+ protected long readUnsignedLong() throws IOException {
+ return readLong() & 0xffffffffL;
+ }
+
+ /**
+ * Reads value of type {@link ExifTag#TYPE_UNSIGNED_RATIONAL} from the
+ * InputStream.
+ */
+ protected Rational readUnsignedRational() throws IOException {
+ long nomi = readUnsignedLong();
+ long denomi = readUnsignedLong();
+ return new Rational(nomi, denomi);
+ }
+
+ /**
+ * Reads value of type {@link ExifTag#TYPE_LONG} from the InputStream.
+ */
+ protected int readLong() throws IOException {
+ return mTiffStream.readInt();
+ }
+
+ /**
+ * Reads value of type {@link ExifTag#TYPE_RATIONAL} from the InputStream.
+ */
+ protected Rational readRational() throws IOException {
+ int nomi = readLong();
+ int denomi = readLong();
+ return new Rational(nomi, denomi);
+ }
+
+ private static class ImageEvent {
+ int stripIndex;
+ int type;
+
+ ImageEvent(int type) {
+ this.stripIndex = 0;
+ this.type = type;
+ }
+
+ ImageEvent(int type, int stripIndex) {
+ this.type = type;
+ this.stripIndex = stripIndex;
+ }
+ }
+
+ private static class IfdEvent {
+ int ifd;
+ boolean isRequested;
+
+ IfdEvent(int ifd, boolean isInterestedIfd) {
+ this.ifd = ifd;
+ this.isRequested = isInterestedIfd;
+ }
+ }
+
+ private static class ExifTagEvent {
+ ExifTag tag;
+ boolean isRequested;
+
+ ExifTagEvent(ExifTag tag, boolean isRequireByUser) {
+ this.tag = tag;
+ this.isRequested = isRequireByUser;
+ }
+ }
+
+ /**
+ * Gets the byte order of the current InputStream.
+ */
+ protected ByteOrder getByteOrder() {
+ return mTiffStream.getByteOrder();
+ }
+}