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ImageIO plugin for Aldus/Adobe Tagged Image File Format (TIFF).
/*
* 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 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.plugins.tiff;
import com.twelvemonkeys.imageio.metadata.tiff.TIFF;
import com.twelvemonkeys.imageio.spi.ImageReaderSpiBase;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.spi.ServiceRegistry;
import javax.imageio.stream.ImageInputStream;
import java.io.IOException;
import java.nio.ByteOrder;
import java.util.Locale;
/**
* TIFFImageReaderSpi
*
* @author Harald Kuhr
* @author last modified by $Author: haraldk$
* @version $Id: TIFFImageReaderSpi.java,v 1.0 08.05.12 15:14 haraldk Exp$
*/
public final class TIFFImageReaderSpi extends ImageReaderSpiBase {
/**
* Creates a {@code TIFFImageReaderSpi}.
*/
public TIFFImageReaderSpi() {
super(new TIFFProviderInfo());
}
@SuppressWarnings("unchecked")
@Override
public void onRegistration(final ServiceRegistry registry, final Class> category) {
// Make sure we're ordered before the Apple-provided TIFF reader on OS X
try {
Class providerClass = (Class) Class.forName("com.sun.imageio.plugins.tiff.TIFFImageReaderSpi");
ImageReaderSpi appleSpi = registry.getServiceProviderByClass(providerClass);
if (appleSpi != null && appleSpi.getVendorName() != null && appleSpi.getVendorName().startsWith("Apple")) {
registry.setOrdering((Class) category, this, appleSpi);
}
}
catch (ClassNotFoundException ignore) {
// This is actually OK, now we don't have to do anything
}
}
public boolean canDecodeInput(final Object pSource) throws IOException {
return canDecodeAs(pSource, TIFF.TIFF_MAGIC);
}
static boolean canDecodeAs(final Object pSource, final int magic) throws IOException {
if (!(pSource instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream) pSource;
stream.mark();
try {
byte[] bom = new byte[2];
stream.readFully(bom);
ByteOrder originalOrder = stream.getByteOrder();
try {
if (bom[0] == 'I' && bom[1] == 'I') {
stream.setByteOrder(ByteOrder.LITTLE_ENDIAN);
}
else if (bom[0] == 'M' && bom[1] == 'M') {
stream.setByteOrder(ByteOrder.BIG_ENDIAN);
}
else {
return false;
}
return stream.readUnsignedShort() == magic;
}
finally {
stream.setByteOrder(originalOrder);
}
}
finally {
stream.reset();
}
}
public TIFFImageReader createReaderInstance(final Object pExtension) {
return new TIFFImageReader(this);
}
public String getDescription(final Locale pLocale) {
return "Aldus/Adobe Tagged Image File Format (TIFF) image reader";
}
}
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