wbmpimagereaderspi.java

JAVA 所有包

/*
 * @(#)WBMPImageReaderSpi.java	1.7 05/11/17 14:15:07
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.imageio.plugins.wbmp;

import java.util.Locale;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.spi.IIORegistry;
import javax.imageio.spi.ServiceRegistry;
import java.io.IOException;
import javax.imageio.ImageReader;
import javax.imageio.IIOException;

public class WBMPImageReaderSpi extends ImageReaderSpi {

    private static String [] writerSpiNames =
        {"com.sun.imageio.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("Sun Microsystems, Inc.",
              "1.0",
              formatNames,
              entensions,
              mimeType,
              "com.sun.imageio.plugins.wbmp.WBMPImageReader",
              STANDARD_INPUT_TYPE,
              writerSpiNames,
              true,
              null, null, null, null,
              true,
              WBMPMetadata.nativeMetadataFormatName,
              "com.sun.imageio.plugins.wbmp.WBMPMetadataFormat",
              null, null);
    }

    public void onRegistration(ServiceRegistry registry,
                               Class<?> category) {
        if (registered) {
            return;
        }
        registered = true;
    }

    public String getDescription(Locale locale) {
        return "Standard WBMP Image Reader";
    }

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

        ImageInputStream stream = (ImageInputStream)source;
        byte[] b = new byte[3];

        stream.mark();
        stream.readFully(b);
        stream.reset();

        return ((b[0] == (byte)0) &&  // TypeField == 0
                b[1] == 0 && // FixHeaderField == 0xxx00000; not support ext header
                ((b[2] & 0x8f) != 0 || (b[2] & 0x7f) != 0));  // First width byte
                //XXX: b[2] & 0x8f) != 0 for the bug in Sony Ericsson encoder.
    }

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