001/*
002 * $RCSfile: TIFFImageReaderSpi.java,v $
003 *
004 * 
005 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
006 * 
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions
009 * are met: 
010 * 
011 * - Redistribution of source code must retain the above copyright 
012 *   notice, this  list of conditions and the following disclaimer.
013 * 
014 * - Redistribution in binary form must reproduce the above copyright
015 *   notice, this list of conditions and the following disclaimer in 
016 *   the documentation and/or other materials provided with the
017 *   distribution.
018 * 
019 * Neither the name of Sun Microsystems, Inc. or the names of 
020 * contributors may be used to endorse or promote products derived 
021 * from this software without specific prior written permission.
022 * 
023 * This software is provided "AS IS," without a warranty of any 
024 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
025 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
026 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
028 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
029 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
031 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035 * POSSIBILITY OF SUCH DAMAGES. 
036 * 
037 * You acknowledge that this software is not designed or intended for 
038 * use in the design, construction, operation or maintenance of any 
039 * nuclear facility. 
040 *
041 * $Revision: 1.2 $
042 * $Date: 2006/03/31 19:43:41 $
043 * $State: Exp $
044 */
045package com.github.jaiimageio.impl.plugins.tiff;
046
047import java.io.IOException;
048import java.util.Locale;
049
050import javax.imageio.ImageReader;
051import javax.imageio.spi.ImageReaderSpi;
052import javax.imageio.spi.ServiceRegistry;
053import javax.imageio.stream.ImageInputStream;
054
055import com.github.jaiimageio.impl.common.PackageUtil;
056
057public class TIFFImageReaderSpi extends ImageReaderSpi {
058
059    private static final String[] names = { "tif", "TIF", "tiff", "TIFF" };
060
061    private static final String[] suffixes = { "tif", "tiff" };
062
063    private static final String[] MIMETypes = { "image/tiff" };
064
065    private static final String readerClassName =
066        "com.github.jaiimageio.impl.plugins.tiff.TIFFImageReader";
067
068    private static final String[] writerSpiNames = {
069        "com.github.jaiimageio.impl.plugins.tiff.TIFFImageWriterSpi"
070    };
071
072    private boolean registered = false;
073 
074    public TIFFImageReaderSpi() {
075        super(PackageUtil.getVendor(),
076              PackageUtil.getVersion(),
077              names,
078              suffixes,
079              MIMETypes,
080              readerClassName,
081              STANDARD_INPUT_TYPE,
082              writerSpiNames,
083              false,
084              TIFFStreamMetadata.nativeMetadataFormatName,
085              "com.github.jaiimageio.impl.plugins.tiff.TIFFStreamMetadataFormat",
086              null, null,
087              true,
088              TIFFImageMetadata.nativeMetadataFormatName,
089              "com.github.jaiimageio.impl.plugins.tiff.TIFFImageMetadataFormat",
090              null, null
091              );
092    }
093
094    public String getDescription(Locale locale) {
095        String desc = PackageUtil.getSpecificationTitle() + 
096            " TIFF Image Reader";
097        return desc;
098    }
099
100    public boolean canDecodeInput(Object input) throws IOException {
101        if (!(input instanceof ImageInputStream)) {
102            return false;
103        }
104        
105        ImageInputStream stream = (ImageInputStream)input;
106        byte[] b = new byte[4];
107        stream.mark();
108        stream.readFully(b);
109        stream.reset();
110
111        return ((b[0] == (byte)0x49 && b[1] == (byte)0x49 &&
112                 b[2] == (byte)0x2a && b[3] == (byte)0x00) ||
113                (b[0] == (byte)0x4d && b[1] == (byte)0x4d &&
114                 b[2] == (byte)0x00 && b[3] == (byte)0x2a));
115    }
116
117    public ImageReader createReaderInstance(Object extension) {
118        return new TIFFImageReader(this);
119    }
120
121    public void onRegistration(ServiceRegistry registry,
122                               Class category) {
123        if (registered) {
124            return;
125        }
126        
127        registered = true;
128    }
129}