jdk/src/share/classes/com/sun/imageio/plugins/png/PNGImageReaderSpi.java
author ohair
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/*
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 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package com.sun.imageio.plugins.png;
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import java.io.IOException;
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import java.util.Locale;
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import java.util.Iterator;
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import javax.imageio.ImageReader;
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import javax.imageio.spi.ImageReaderSpi;
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import javax.imageio.metadata.IIOMetadataFormat;
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import javax.imageio.metadata.IIOMetadataFormatImpl;
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import javax.imageio.stream.ImageInputStream;
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public class PNGImageReaderSpi extends ImageReaderSpi {
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    private static final String vendorName = "Oracle Corporation";
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    private static final String version = "1.0";
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    private static final String[] names = { "png", "PNG" };
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    private static final String[] suffixes = { "png" };
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    private static final String[] MIMETypes = { "image/png", "image/x-png" };
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    private static final String readerClassName =
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        "com.sun.imageio.plugins.png.PNGImageReader";
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    private static final String[] writerSpiNames = {
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        "com.sun.imageio.plugins.png.PNGImageWriterSpi"
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    };
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    public PNGImageReaderSpi() {
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        super(vendorName,
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              version,
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              names,
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              suffixes,
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              MIMETypes,
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              readerClassName,
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              new Class[] { ImageInputStream.class },
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              writerSpiNames,
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              false,
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              null, null,
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              null, null,
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              true,
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              PNGMetadata.nativeMetadataFormatName,
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              "com.sun.imageio.plugins.png.PNGMetadataFormat",
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              null, null
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              );
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    }
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    public String getDescription(Locale locale) {
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        return "Standard PNG image reader";
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    }
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    public boolean canDecodeInput(Object input) throws IOException {
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        if (!(input instanceof ImageInputStream)) {
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            return false;
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        }
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        ImageInputStream stream = (ImageInputStream)input;
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        byte[] b = new byte[8];
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        stream.mark();
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        stream.readFully(b);
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        stream.reset();
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        return (b[0] == (byte)137 &&
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                b[1] == (byte)80 &&
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                b[2] == (byte)78 &&
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                b[3] == (byte)71 &&
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                b[4] == (byte)13 &&
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                b[5] == (byte)10 &&
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                b[6] == (byte)26 &&
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                b[7] == (byte)10);
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    }
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    public ImageReader createReaderInstance(Object extension) {
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        return new PNGImageReader(this);
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    }
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}