/*
* Copyright (c) 2012, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name "TwelveMonkeys" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.alkacon.simapi.CmykJpegReader;
import javax.imageio.IIOException;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.lang.ref.SoftReference;
import java.util.Arrays;
/**
* EXIFThumbnail
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haraldk$
* @version $Id: EXIFThumbnail.java,v 1.0 18.04.12 12:19 haraldk Exp$
*/
final class EXIFThumbnailReader extends ThumbnailReader {
private final ImageReader reader;
private final Directory ifd;
private final ImageInputStream stream;
private final int compression;
private transient SoftReference<BufferedImage> cachedThumbnail;
public EXIFThumbnailReader(ThumbnailReadProgressListener progressListener, ImageReader jpegReader, int imageIndex, int thumbnailIndex, Directory ifd, ImageInputStream stream) {
super(progressListener, imageIndex, thumbnailIndex);
this.reader = Validate.notNull(jpegReader);
this.ifd = ifd;
this.stream = stream;
Entry compression = ifd.getEntryById(TIFF.TAG_COMPRESSION);
this.compression = compression != null ? ((Number) compression.getValue()).intValue() : 6;
}
@Override
public BufferedImage read() throws IOException {
if (compression == 1) { // 1 = no compression
processThumbnailStarted();
BufferedImage thumbnail = readUncompressed();
processThumbnailProgress(100f);
processThumbnailComplete();
return thumbnail;
}
else if (compression == 6) { // 6 = JPEG compression
processThumbnailStarted();
BufferedImage thumbnail = readJPEGCached(true);
processThumbnailProgress(100f);
processThumbnailComplete();
return thumbnail;
}
else {
throw new IIOException("Unsupported EXIF thumbnail compression: " + compression);
}
}
private BufferedImage readJPEGCached(boolean pixelsExposed) throws IOException {
BufferedImage thumbnail = cachedThumbnail != null ? cachedThumbnail.get() : null;
if (thumbnail == null) {
thumbnail = readJPEG();
}
cachedThumbnail = pixelsExposed ? null : new SoftReference<BufferedImage>(thumbnail);
return thumbnail;
}
private BufferedImage readJPEG() throws IOException {
// IFD1 should contain JPEG offset for JPEG thumbnail
Entry jpegOffset = ifd.getEntryById(TIFF.TAG_JPEG_INTERCHANGE_FORMAT);
if (jpegOffset != null) {
stream.seek(((Number) jpegOffset.getValue()).longValue());
InputStream input = IIOUtil.createStreamAdapter(stream);
// For certain EXIF files (encoded with TIFF.TAG_YCBCR_POSITIONING = 2?), we need
// EXIF information to read the thumbnail correctly (otherwise the colors are messed up).
// Probably related to: http://bugs.sun.com/view_bug.do?bug_id=4881314
// HACK: Splice empty EXIF information into the thumbnail stream
byte[] fakeEmptyExif = {
// SOI (from original data)
(byte) input.read(), (byte) input.read(),
// APP1 + len (016) + 'Exif' + 0-term + pad
(byte) 0xFF, (byte) 0xE1, 0, 16, 'E', 'x', 'i', 'f', 0, 0,
// Big-endian BOM (MM), TIFF magic (042), offset (0000)
'M', 'M', 0, 42, 0, 0, 0, 0,
};
input = new SequenceInputStream(new ByteArrayInputStream(fakeEmptyExif), input);
try {
MemoryCacheImageInputStream stream = new MemoryCacheImageInputStream(input);
try {
return readJPEGThumbnail(reader, stream);
}
finally {
stream.close();
}
}
finally {
input.close();
}
}
throw new IIOException("Missing JPEGInterchangeFormat tag for JPEG compressed EXIF thumbnail");
}
private BufferedImage readUncompressed() throws IOException {
// Read ImageWidth, ImageLength (height) and BitsPerSample (=8 8 8, always)
// PhotometricInterpretation (2=RGB, 6=YCbCr), SamplesPerPixel (=3, always),
Entry width = ifd.getEntryById(TIFF.TAG_IMAGE_WIDTH);
Entry height = ifd.getEntryById(TIFF.TAG_IMAGE_HEIGHT);
if (width == null || height == null) {
throw new IIOException("Missing dimensions for uncompressed EXIF thumbnail");
}
Entry bitsPerSample = ifd.getEntryById(TIFF.TAG_BITS_PER_SAMPLE);
Entry samplesPerPixel = ifd.getEntryById(TIFF.TAG_SAMPLES_PER_PIXEL);
Entry photometricInterpretation = ifd.getEntryById(TIFF.TAG_PHOTOMETRIC_INTERPRETATION);
// Required
int w = ((Number) width.getValue()).intValue();
int h = ((Number) height.getValue()).intValue();
if (bitsPerSample != null) {
int[] bpp = (int[]) bitsPerSample.getValue();
if (!Arrays.equals(bpp, new int[] {8, 8, 8})) {
throw new IIOException("Unknown BitsPerSample value for uncompressed EXIF thumbnail (expected [8, 8, 8]): " + bitsPerSample.getValueAsString());
}
}
if (samplesPerPixel != null && (Integer) samplesPerPixel.getValue() != 3) {
throw new IIOException("Unknown SamplesPerPixel value for uncompressed EXIF thumbnail (expected 3): " + samplesPerPixel.getValueAsString());
}
int interpretation = photometricInterpretation != null ? ((Number) photometricInterpretation.getValue()).intValue() : 2;
// IFD1 should contain strip offsets for uncompressed images
Entry offset = ifd.getEntryById(TIFF.TAG_STRIP_OFFSETS);
if (offset != null) {
stream.seek(((Number) offset.getValue()).longValue());
// Read raw image data, either RGB or YCbCr
int thumbSize = w * h * 3;
byte[] thumbData = JPEGImageReader.readFully(stream, thumbSize);
switch (interpretation) {
case 2:
// RGB
break;
case 6:
// YCbCr
for (int i = 0, thumbDataLength = thumbData.length; i < thumbDataLength; i += 3) {
JPEGImageReader.YCbCrConverter.convertYCbCr2RGB(thumbData, thumbData, i);
}
break;
default:
throw new IIOException("Unknown PhotometricInterpretation value for uncompressed EXIF thumbnail (expected 2 or 6): " + interpretation);
}
return ThumbnailReader.readRawThumbnail(thumbData, thumbData.length, 0, w, h);
}
throw new IIOException("Missing StripOffsets tag for uncompressed EXIF thumbnail");
}
@Override
public int getWidth() throws IOException {
if (compression == 1) { // 1 = no compression
Entry width = ifd.getEntryById(TIFF.TAG_IMAGE_WIDTH);
if (width == null) {
throw new IIOException("Missing dimensions for uncompressed EXIF thumbnail");
}
return ((Number) width.getValue()).intValue();
}
else if (compression == 6) { // 6 = JPEG compression
return readJPEGCached(false).getWidth();
}
else {
throw new IIOException("Unsupported EXIF thumbnail compression (expected 1 or 6): " + compression);
}
}
@Override
public int getHeight() throws IOException {
if (compression == 1) { // 1 = no compression
Entry height = ifd.getEntryById(TIFF.TAG_IMAGE_HEIGHT);
if (height == null) {
throw new IIOException("Missing dimensions for uncompressed EXIF thumbnail");
}
return ((Number) height.getValue()).intValue();
}
else if (compression == 6) { // 6 = JPEG compression
return readJPEGCached(false).getHeight();
}
else {
throw new IIOException("Unsupported EXIF thumbnail compression (expected 1 or 6): " + compression);
}
}
}