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Added JPEG utils.
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Harald Kuhr
parent
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4d9661f950
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/*
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* Copyright (c) 2011, Harald Kuhr
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name "TwelveMonkeys" nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.twelvemonkeys.imageio.metadata.jpeg;
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/**
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* JPEG
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*
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* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
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* @author last modified by $Author: haraldk$
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* @version $Id: JPEG.java,v 1.0 11.02.11 15.51 haraldk Exp$
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*/
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public interface JPEG {
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int SOS = 0xFFDA;
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int SOI = 0xFFD8;
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int EOI = 0xFFD9;
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int APP0 = 0xFFE0;
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int APP1 = 0xFFE1;
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int APP2 = 0xFFE2;
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int APP14 = 0xFFEE;
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int SOF0 = 0xFFC0;
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int SOF1 = 0xFFC1;
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int SOF2 = 0xFFC2;
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int SOF3 = 0xFFC3;
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int SOF5 = 0xFFC5;
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int SOF6 = 0xFFC6;
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int SOF7 = 0xFFC7;
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int SOF9 = 0xFFC9;
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int SOF10 = 0xFFCA;
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int SOF11 = 0xFFCB;
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int SOF13 = 0xFFCD;
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int SOF14 = 0xFFCE;
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int SOF15 = 0xFFCF;
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}
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@ -0,0 +1,186 @@
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/*
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* Copyright (c) 2011, Harald Kuhr
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* Neither the name "TwelveMonkeys" nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.twelvemonkeys.imageio.metadata.jpeg;
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import javax.imageio.IIOException;
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import javax.imageio.stream.ImageInputStream;
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import java.io.*;
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import java.nio.charset.Charset;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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/**
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* JPEGSegmentUtil
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*
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* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
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* @author last modified by $Author: haraldk$
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* @version $Id: JPEGSegmentUtil.java,v 1.0 24.01.11 17.37 haraldk Exp$
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*/
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public final class JPEGSegmentUtil {
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public static final Map<Integer, List<String>> ALL_SEGMENTS = Collections.emptyMap();
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private JPEGSegmentUtil() {}
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// TODO: Allow for multiple images (multiple SOI markers), using specified index?
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public static List<Segment> readSegments(final ImageInputStream stream, final int appMarker, final String segmentName) throws IOException {
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return readSegments(stream, Collections.singletonMap(appMarker, Collections.singletonList(segmentName)));
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}
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public static List<Segment> readSegments(final ImageInputStream stream, Map<Integer, List<String>> segmentIdentifiers) throws IOException {
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readSOI(stream);
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List<Segment> segments = Collections.emptyList();
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Segment segment;
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try {
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while (!isImageDone(segment = readSegment(stream, segmentIdentifiers))) {
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// while (!isImageDone(segment = readSegment(stream, ALL_SEGMENTS))) {
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// System.err.println("segment: " + segment);
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if (isRequested(segment, segmentIdentifiers)) {
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if (segments == Collections.EMPTY_LIST) {
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segments = new ArrayList<Segment>();
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}
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segments.add(segment);
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}
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}
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}
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catch (EOFException ignore) {
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// Just end here, in case of malformed stream
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}
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return segments;
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}
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private static boolean isRequested(Segment segment, Map<Integer, List<String>> segmentIdentifiers) {
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return segmentIdentifiers == ALL_SEGMENTS ||
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(segmentIdentifiers.containsKey(segment.marker) &&
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(segment.identifier() == null && segmentIdentifiers.get(segment.marker) == null || containsSafe(segment, segmentIdentifiers)));
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}
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private static boolean containsSafe(Segment segment, Map<Integer, List<String>> segmentIdentifiers) {
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List<String> identifiers = segmentIdentifiers.get(segment.marker);
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return identifiers != null && identifiers.contains(segment.identifier());
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}
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private static boolean isImageDone(final Segment segment) {
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// We're done with this image if we encounter a SOS, EOI (or a new SOI, but that should never happen)
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return segment.marker == JPEG.SOS || segment.marker == JPEG.EOI || segment.marker == JPEG.SOI;
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}
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static String asNullTerminatedAsciiString(final byte[] data, final int offset) {
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for (int i = 0; i < data.length - offset; i++) {
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if (data[i] == 0 || i > 255) {
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return asAsciiString(data, offset, offset + i);
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}
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}
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return null;
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}
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static String asAsciiString(final byte[] data, final int offset, final int length) {
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return new String(data, offset, length, Charset.forName("ascii"));
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}
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static void readSOI(final ImageInputStream stream) throws IOException {
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if (stream.readUnsignedShort() != JPEG.SOI) {
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throw new IIOException("Not a JPEG stream");
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}
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}
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static Segment readSegment(final ImageInputStream stream, Map<Integer, List<String>> segmentIdentifiers) throws IOException {
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int marker = stream.readUnsignedShort();
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int length = stream.readUnsignedShort(); // Length including length field itself
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byte[] data;
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if (segmentIdentifiers == ALL_SEGMENTS || segmentIdentifiers.containsKey(marker)) {
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data = new byte[length - 2];
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stream.readFully(data);
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}
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else {
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data = null;
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stream.skipBytes(length - 2);
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}
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return new Segment(marker, data);
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}
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public static final class Segment {
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private final int marker;
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private final byte[] data;
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private String id;
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Segment(int marker, byte[] data) {
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this.marker = marker;
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this.data = data;
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}
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int segmentLength() {
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// This is the length field as read from the stream
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return data.length + 2;
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}
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public int marker() {
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return marker;
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}
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public String identifier() {
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if (id == null) {
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if (marker >= 0xFFE0 && marker <= 0xFFEF) {
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// Only for APPn markers
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id = asNullTerminatedAsciiString(data, 0);
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}
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}
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return id;
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}
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public InputStream data() {
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return new ByteArrayInputStream(data, offset(), length());
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}
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public int length() {
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return data.length - offset();
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}
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private int offset() {
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String identifier = identifier();
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return identifier == null ? 0 : identifier.length() + 1;
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}
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@Override
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public String toString() {
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return String.format("Segment[%04x/%s size: %d]", marker, identifier(), segmentLength());
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}
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}
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}
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