001/*
002 * $RCSfile: WBMPImageReaderSpi.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: 1.3 $
042 * $Date: 2006/04/21 00:02:53 $
043 * $State: Exp $
044 */
045package com.github.jaiimageio.impl.plugins.wbmp;
046
047import java.io.IOException;
048import java.util.Locale;
049
050import javax.imageio.IIOException;
051import javax.imageio.ImageReader;
052import javax.imageio.spi.ImageReaderSpi;
053import javax.imageio.spi.ServiceRegistry;
054import javax.imageio.stream.ImageInputStream;
055
056import com.github.jaiimageio.impl.common.ImageUtil;
057import com.github.jaiimageio.impl.common.PackageUtil;
058
059public class WBMPImageReaderSpi extends ImageReaderSpi {
060
061    private static String [] writerSpiNames =
062        {"com.github.jaiimageio.impl.plugins.wbmp.WBMPImageWriterSpi"};
063    private static String[] formatNames = {"wbmp", "WBMP"};
064    private static String[] entensions = {"wbmp"};
065    private static String[] mimeType = {"image/vnd.wap.wbmp"};
066
067    private boolean registered = false;
068
069    public WBMPImageReaderSpi() {
070        super(PackageUtil.getVendor(),
071              PackageUtil.getVersion(),
072              formatNames,
073              entensions,
074              mimeType,
075              "com.github.jaiimageio.impl.plugins.wbmp.WBMPImageReader",
076              STANDARD_INPUT_TYPE,
077              writerSpiNames,
078              true,
079              null, null, null, null,
080              true,
081              WBMPMetadata.nativeMetadataFormatName,
082              "com.github.jaiimageio.impl.plugins.wbmp.WBMPMetadataFormat",
083              null, null);
084    }
085
086    public void onRegistration(ServiceRegistry registry,
087                               Class category) {
088        if (registered) {
089            return;
090        }
091        registered = true;
092        
093        // By JDK 1.7, the WBMPImageReader will have been in JDK core for 
094        // atleast two FCS releases, so we can set JIIO's to lower priority
095        // With JDK 1.8, we can entirely de-register the JIIO one
096        ImageUtil.processOnRegistration(registry, category, "WBMP", this,
097                                        8, 7); // JDK version 1.8, 1.7
098    }
099
100    public String getDescription(Locale locale) {
101        String desc = PackageUtil.getSpecificationTitle() + 
102            " WBMP Image Reader";  
103        return desc;
104    }
105
106    public boolean canDecodeInput(Object source) throws IOException {
107        if (!(source instanceof ImageInputStream)) {
108            return false;
109        }
110
111        ImageInputStream stream = (ImageInputStream)source;
112
113        stream.mark();
114        int type = stream.readByte();   // TypeField
115        byte fixHeaderField = stream.readByte();
116
117        int width = ImageUtil.readMultiByteInteger(stream);
118        int height = ImageUtil.readMultiByteInteger(stream);
119
120        long remainingBytes = stream.length() - stream.getStreamPosition();
121        stream.reset();
122
123        // check WBMP "header"
124        if (type != 0 || fixHeaderField != 0) {
125            // while WBMP reader does not support ext WBMP headers
126            return false;
127        }
128        
129        // check image dimension
130        if (width <= 0 || height <= 0) {
131            return false;
132        }
133
134        long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);
135        
136        return (remainingBytes == scanSize * height);
137    }
138
139    public ImageReader createReaderInstance(Object extension)
140        throws IIOException {
141        return new WBMPImageReader(this);
142    }
143}
144