/*
* @(#)PNGImageReaderSpi.java 1.28 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.png;
import java.io.IOException;
import java.util.Locale;
import java.util.Iterator;
import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;
import javax.imageio.stream.ImageInputStream;
/**
* @version 0.5
*/
public class PNGImageReaderSpi extends ImageReaderSpi {
private static final String vendorName = "Sun Microsystems, Inc.";
private static final String version = "1.0";
private static final String[] names = { "png", "PNG" };
private static final String[] suffixes = { "png" };
private static final String[] MIMETypes = { "image/png", "image/x-png" };
private static final String readerClassName =
"com.sun.imageio.plugins.png.PNGImageReader";
private static final String[] writerSpiNames = {
"com.sun.imageio.plugins.png.PNGImageWriterSpi"
};
public PNGImageReaderSpi() {
super(vendorName,
version,
names,
suffixes,
MIMETypes,
readerClassName,
new Class[] { ImageInputStream.class },
writerSpiNames,
false,
null, null,
null, null,
true,
PNGMetadata.nativeMetadataFormatName,
"com.sun.imageio.plugins.png.PNGMetadataFormat",
null, null
);
}
public String getDescription(Locale locale) {
return "Standard PNG image reader";
}
public boolean canDecodeInput(Object input) throws IOException {
if (!(input instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)input;
byte[] b = new byte[8];
stream.mark();
stream.readFully(b);
stream.reset();
return (b[0] == (byte)137 &&
b[1] == (byte)80 &&
b[2] == (byte)78 &&
b[3] == (byte)71 &&
b[4] == (byte)13 &&
b[5] == (byte)10 &&
b[6] == (byte)26 &&
b[7] == (byte)10);
}
public ImageReader createReaderInstance(Object extension) {
return new PNGImageReader(this);
}
}