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Added JPEG utils.

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Harald Kuhr 2011-02-14 16:59:38 +01:00
parent 8d5b775851
commit 4d9661f950
2 changed files with 247 additions and 0 deletions
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61
imageio/imageio-metadata/src/main/java/com/twelvemonkeys/imageio/metadata/jpeg/JPEG.java Normal file
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/*
* Copyright (c) 2011, 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.twelvemonkeys.imageio.metadata.jpeg;
/**
* JPEG
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haraldk$
* @version $Id: JPEG.java,v 1.0 11.02.11 15.51 haraldk Exp$
*/
public interface JPEG {
int SOS = 0xFFDA;
int SOI = 0xFFD8;
int EOI = 0xFFD9;
int APP0 = 0xFFE0;
int APP1 = 0xFFE1;
int APP2 = 0xFFE2;
int APP14 = 0xFFEE;
int SOF0 = 0xFFC0;
int SOF1 = 0xFFC1;
int SOF2 = 0xFFC2;
int SOF3 = 0xFFC3;
int SOF5 = 0xFFC5;
int SOF6 = 0xFFC6;
int SOF7 = 0xFFC7;
int SOF9 = 0xFFC9;
int SOF10 = 0xFFCA;
int SOF11 = 0xFFCB;
int SOF13 = 0xFFCD;
int SOF14 = 0xFFCE;
int SOF15 = 0xFFCF;
}

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imageio/imageio-metadata/src/main/java/com/twelvemonkeys/imageio/metadata/jpeg/JPEGSegmentUtil.java Normal file
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/*
* Copyright (c) 2011, 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.twelvemonkeys.imageio.metadata.jpeg;
import javax.imageio.IIOException;
import javax.imageio.stream.ImageInputStream;
import java.io.*;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* JPEGSegmentUtil
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haraldk$
* @version $Id: JPEGSegmentUtil.java,v 1.0 24.01.11 17.37 haraldk Exp$
*/
public final class JPEGSegmentUtil {
public static final Map<Integer, List<String>> ALL_SEGMENTS = Collections.emptyMap();
private JPEGSegmentUtil() {}
// TODO: Allow for multiple images (multiple SOI markers), using specified index?
public static List<Segment> readSegments(final ImageInputStream stream, final int appMarker, final String segmentName) throws IOException {
return readSegments(stream, Collections.singletonMap(appMarker, Collections.singletonList(segmentName)));
}
public static List<Segment> readSegments(final ImageInputStream stream, Map<Integer, List<String>> segmentIdentifiers) throws IOException {
readSOI(stream);
List<Segment> segments = Collections.emptyList();
Segment segment;
try {
while (!isImageDone(segment = readSegment(stream, segmentIdentifiers))) {
// while (!isImageDone(segment = readSegment(stream, ALL_SEGMENTS))) {
// System.err.println("segment: " + segment);
if (isRequested(segment, segmentIdentifiers)) {
if (segments == Collections.EMPTY_LIST) {
segments = new ArrayList<Segment>();
}
segments.add(segment);
}
}
}
catch (EOFException ignore) {
// Just end here, in case of malformed stream
}
return segments;
}
private static boolean isRequested(Segment segment, Map<Integer, List<String>> segmentIdentifiers) {
return segmentIdentifiers == ALL_SEGMENTS ||
(segmentIdentifiers.containsKey(segment.marker) &&
(segment.identifier() == null && segmentIdentifiers.get(segment.marker) == null || containsSafe(segment, segmentIdentifiers)));
}
private static boolean containsSafe(Segment segment, Map<Integer, List<String>> segmentIdentifiers) {
List<String> identifiers = segmentIdentifiers.get(segment.marker);
return identifiers != null && identifiers.contains(segment.identifier());
}
private static boolean isImageDone(final Segment segment) {
// We're done with this image if we encounter a SOS, EOI (or a new SOI, but that should never happen)
return segment.marker == JPEG.SOS || segment.marker == JPEG.EOI || segment.marker == JPEG.SOI;
}
static String asNullTerminatedAsciiString(final byte[] data, final int offset) {
for (int i = 0; i < data.length - offset; i++) {
if (data[i] == 0 || i > 255) {
return asAsciiString(data, offset, offset + i);
}
}
return null;
}
static String asAsciiString(final byte[] data, final int offset, final int length) {
return new String(data, offset, length, Charset.forName("ascii"));
}
static void readSOI(final ImageInputStream stream) throws IOException {
if (stream.readUnsignedShort() != JPEG.SOI) {
throw new IIOException("Not a JPEG stream");
}
}
static Segment readSegment(final ImageInputStream stream, Map<Integer, List<String>> segmentIdentifiers) throws IOException {
int marker = stream.readUnsignedShort();
int length = stream.readUnsignedShort(); // Length including length field itself
byte[] data;
if (segmentIdentifiers == ALL_SEGMENTS || segmentIdentifiers.containsKey(marker)) {
data = new byte[length - 2];
stream.readFully(data);
}
else {
data = null;
stream.skipBytes(length - 2);
}
return new Segment(marker, data);
}
public static final class Segment {
private final int marker;
private final byte[] data;
private String id;
Segment(int marker, byte[] data) {
this.marker = marker;
this.data = data;
}
int segmentLength() {
// This is the length field as read from the stream
return data.length + 2;
}
public int marker() {
return marker;
}
public String identifier() {
if (id == null) {
if (marker >= 0xFFE0 && marker <= 0xFFEF) {
// Only for APPn markers
id = asNullTerminatedAsciiString(data, 0);
}
}
return id;
}
public InputStream data() {
return new ByteArrayInputStream(data, offset(), length());
}
public int length() {
return data.length - offset();
}
private int offset() {
String identifier = identifier();
return identifier == null ? 0 : identifier.length() + 1;
}
@Override
public String toString() {
return String.format("Segment[%04x/%s size: %d]", marker, identifier(), segmentLength());
}
}
}