com.twelvemonkeys.imageio.plugins.jpeg.JFIFSegment Maven / Gradle / Ivy
/*
* 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.twelvemonkeys.imageio.plugins.jpeg;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* JFIFSegment
*
* @author Harald Kuhr
* @author last modified by $Author: haraldk$
* @version $Id: JFIFSegment.java,v 1.0 23.04.12 16:52 haraldk Exp$
*/
class JFIFSegment {
final int majorVersion;
final int minorVersion;
final int units;
final int xDensity;
final int yDensity;
final int xThumbnail;
final int yThumbnail;
final byte[] thumbnail;
private JFIFSegment(int majorVersion, int minorVersion, int units, int xDensity, int yDensity, int xThumbnail, int yThumbnail, byte[] thumbnail) {
this.majorVersion = majorVersion;
this.minorVersion = minorVersion;
this.units = units;
this.xDensity = xDensity;
this.yDensity = yDensity;
this.xThumbnail = xThumbnail;
this.yThumbnail = yThumbnail;
this.thumbnail = thumbnail;
}
@Override
public String toString() {
return String.format("JFIF v%d.%02d %dx%d %s (%s)", majorVersion, minorVersion, xDensity, yDensity, unitsAsString(), thumbnailToString());
}
private String unitsAsString() {
switch (units) {
case 0:
return "(aspect only)";
case 1:
return "dpi";
case 2:
return "dpcm";
default:
return "(unknown unit)";
}
}
private String thumbnailToString() {
if (xThumbnail == 0 || yThumbnail == 0) {
return "no thumbnail";
}
return String.format("thumbnail: %dx%d", xThumbnail, yThumbnail);
}
public static JFIFSegment read(final InputStream data) throws IOException {
DataInputStream stream = new DataInputStream(data);
int x, y;
return new JFIFSegment(
stream.readUnsignedByte(),
stream.readUnsignedByte(),
stream.readUnsignedByte(),
stream.readUnsignedShort(),
stream.readUnsignedShort(),
x = stream.readUnsignedByte(),
y = stream.readUnsignedByte(),
JPEGImageReader.readFully(stream, x * y * 3)
);
}
}
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