diff options
Diffstat (limited to 'gallerycommon/src/com/android/gallery3d/exif/ExifParser.java')
| -rw-r--r-- | gallerycommon/src/com/android/gallery3d/exif/ExifParser.java | 916 |
1 files changed, 0 insertions, 916 deletions
diff --git a/gallerycommon/src/com/android/gallery3d/exif/ExifParser.java b/gallerycommon/src/com/android/gallery3d/exif/ExifParser.java deleted file mode 100644 index 5467d423d..000000000 --- a/gallerycommon/src/com/android/gallery3d/exif/ExifParser.java +++ /dev/null @@ -1,916 +0,0 @@ -/* - * 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(); - } -} |