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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 of the copyright holder 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 HOLDER 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 java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Serializable;
import java.util.Arrays;
/**
* Represents a JPEG segment.
*
* @author Harald Kuhr
* @author last modified by $Author: haraldk$
* @version $Id: JPEGSegment.java,v 1.0 02.03.11 10.44 haraldk Exp$
*/
public final class JPEGSegment implements Serializable {
final int marker;
final byte[] data;
private final int length;
private transient String id;
JPEGSegment(int marker, byte[] data, int length) {
this.marker = marker;
this.data = data;
this.length = length;
}
public int segmentLength() {
// This is the length field as read from the stream
return length;
}
public InputStream segmentData() {
return data != null ? new ByteArrayInputStream(data) : null;
}
public int marker() {
return marker;
}
public String identifier() {
if (id == null) {
if (isAppSegmentMarker(marker)) {
// Only for APPn markers
id = JPEGSegmentUtil.asNullTerminatedAsciiString(data, 0);
}
}
return id;
}
static boolean isAppSegmentMarker(final int marker) {
return marker >= 0xFFE0 && marker <= 0xFFEF;
}
// TODO: Consider returning an ImageInputStream and use ByteArrayImageInputStream directly, for less wrapping and better performance
// TODO: BUT: Must find a way to skip padding in/after segment identifier (eg: Exif has null-term + null-pad, ICC_PROFILE has only null-term). Is data always word-aligned?
public InputStream data() {
return data != null ? new ByteArrayInputStream(data, offset(), length()) : null;
}
public int length() {
return data != null ? data.length - offset() : 0;
}
int offset() {
String identifier = identifier();
return identifier == null ? 0 : identifier.length() + 1;
}
@Override
public String toString() {
String identifier = identifier();
if (identifier != null) {
return String.format("JPEGSegment[%04x/%s size: %d]", marker, identifier, segmentLength());
}
return String.format("JPEGSegment[%04x size: %d]", marker, segmentLength());
}
@Override
public int hashCode() {
String identifier = identifier();
return marker() << 16 | (identifier != null ? identifier.hashCode() : 0) & 0xFFFF;
}
@Override
public boolean equals(final Object other) {
return other instanceof JPEGSegment &&
((JPEGSegment) other).marker == marker && Arrays.equals(((JPEGSegment) other).data, data);
}
}