com.github.jaiimageio.impl.plugins.wbmp.WBMPImageReaderSpi Maven / Gradle / Ivy

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Java Advanced Imaging Image I/O Tools API core, but without the classes involved with javax.media.jai dependencies, JPEG2000 or codecLibJIIO, meaning that this library can be distributed under the modified BSD license and should be GPL compatible.
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/*
 * $RCSfile: WBMPImageReaderSpi.java,v $
 *
 * 
 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 
 * 
 * - Redistribution of source code must retain the above copyright 
 *   notice, this  list of conditions and the following disclaimer.
 * 
 * - Redistribution 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 Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any 
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES. 
 * 
 * You acknowledge that this software is not designed or intended for 
 * use in the design, construction, operation or maintenance of any 
 * nuclear facility. 
 *
 * $Revision: 1.3 $
 * $Date: 2006/04/21 00:02:53 $
 * $State: Exp $
 */
package com.github.jaiimageio.impl.plugins.wbmp;

import java.io.IOException;
import java.util.Locale;

import javax.imageio.IIOException;
import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.spi.ServiceRegistry;
import javax.imageio.stream.ImageInputStream;

import com.github.jaiimageio.impl.common.ImageUtil;
import com.github.jaiimageio.impl.common.PackageUtil;

public class WBMPImageReaderSpi extends ImageReaderSpi {

    private static String [] writerSpiNames =
        {"com.github.jaiimageio.impl.plugins.wbmp.WBMPImageWriterSpi"};
    private static String[] formatNames = {"wbmp", "WBMP"};
    private static String[] entensions = {"wbmp"};
    private static String[] mimeType = {"image/vnd.wap.wbmp"};

    private boolean registered = false;

    public WBMPImageReaderSpi() {
        super(PackageUtil.getVendor(),
              PackageUtil.getVersion(),
              formatNames,
              entensions,
              mimeType,
              "com.github.jaiimageio.impl.plugins.wbmp.WBMPImageReader",
              STANDARD_INPUT_TYPE,
              writerSpiNames,
              true,
              null, null, null, null,
              true,
              WBMPMetadata.nativeMetadataFormatName,
	      "com.github.jaiimageio.impl.plugins.wbmp.WBMPMetadataFormat",
	      null, null);
    }

    public void onRegistration(ServiceRegistry registry,
                               Class category) {
        if (registered) {
            return;
        }
        registered = true;
	
	// By JDK 1.7, the WBMPImageReader will have been in JDK core for 
	// atleast two FCS releases, so we can set JIIO's to lower priority
	// With JDK 1.8, we can entirely de-register the JIIO one
	ImageUtil.processOnRegistration(registry, category, "WBMP", this,
					8, 7); // JDK version 1.8, 1.7
    }

    public String getDescription(Locale locale) {
	String desc = PackageUtil.getSpecificationTitle() + 
	    " WBMP Image Reader";  
	return desc;
    }

    public boolean canDecodeInput(Object source) throws IOException {
        if (!(source instanceof ImageInputStream)) {
            return false;
        }

        ImageInputStream stream = (ImageInputStream)source;

        stream.mark();
        int type = stream.readByte();   // TypeField
        byte fixHeaderField = stream.readByte();

        int width = ImageUtil.readMultiByteInteger(stream);
        int height = ImageUtil.readMultiByteInteger(stream);

        long remainingBytes = stream.length() - stream.getStreamPosition();
        stream.reset();

        // check WBMP "header"
        if (type != 0 || fixHeaderField != 0) {
            // while WBMP reader does not support ext WBMP headers
            return false;
        }
        
        // check image dimension
        if (width <= 0 || height <= 0) {
            return false;
        }

        long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);
        
        return (remainingBytes == scanSize * height);
    }

    public ImageReader createReaderInstance(Object extension)
        throws IIOException {
        return new WBMPImageReader(this);
    }
}