/*
* @(#)GIFImageReaderSpi.java 1.23 09/04/29
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.sun.imageio.plugins.gif;
import java.io.IOException;
import java.util.Locale;
import java.util.Iterator;
import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
/**
* @version 0.5
*/
public class GIFImageReaderSpi extends ImageReaderSpi {
private static final String vendorName = "Sun Microsystems, Inc.";
private static final String version = "1.0";
private static final String[] names = { "gif", "GIF" };
private static final String[] suffixes = { "gif" };
private static final String[] MIMETypes = { "image/gif" };
private static final String readerClassName =
"com.sun.imageio.plugins.gif.GIFImageReader";
private static final String[] writerSpiNames = {
"com.sun.imageio.plugins.gif.GIFImageWriterSpi"
};
public GIFImageReaderSpi() {
super(vendorName,
version,
names,
suffixes,
MIMETypes,
readerClassName,
new Class[] { ImageInputStream.class },
writerSpiNames,
true,
GIFStreamMetadata.nativeMetadataFormatName,
"com.sun.imageio.plugins.gif.GIFStreamMetadataFormat",
null, null,
true,
GIFImageMetadata.nativeMetadataFormatName,
"com.sun.imageio.plugins.gif.GIFImageMetadataFormat",
null, null
);
}
public String getDescription(Locale locale) {
return "Standard GIF image reader";
}
public boolean canDecodeInput(Object input) throws IOException {
if (!(input instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)input;
byte[] b = new byte[6];
stream.mark();
stream.readFully(b);
stream.reset();
return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8' &&
(b[4] == '7' || b[4] == '9') && b[5] == 'a';
}
public ImageReader createReaderInstance(Object extension) {
return new GIFImageReader(this);
}
}