зеркало из https://github.com/mono/ikvm-fork.git
113 строки
3.9 KiB
Java
113 строки
3.9 KiB
Java
/*
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* Copyright 2000-2004 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.imageio.plugins.jpeg;
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import java.util.Locale;
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import javax.imageio.spi.ImageReaderSpi;
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import javax.imageio.stream.ImageInputStream;
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import javax.imageio.spi.IIORegistry;
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import javax.imageio.spi.ServiceRegistry;
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import java.io.IOException;
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import javax.imageio.ImageReader;
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import javax.imageio.IIOException;
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public class JPEGImageReaderSpi extends ImageReaderSpi {
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private static String [] writerSpiNames =
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{"com.sun.imageio.plugins.jpeg.JPEGImageWriterSpi"};
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private boolean registered = false;
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public JPEGImageReaderSpi() {
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super(JPEG.vendor,
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JPEG.version,
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JPEG.names,
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JPEG.suffixes,
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JPEG.MIMETypes,
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"com.sun.imageio.plugins.jpeg.JPEGImageReader",
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STANDARD_INPUT_TYPE,
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writerSpiNames,
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true,
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JPEG.nativeStreamMetadataFormatName,
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JPEG.nativeStreamMetadataFormatClassName,
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null, null,
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true,
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JPEG.nativeImageMetadataFormatName,
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JPEG.nativeImageMetadataFormatClassName,
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null, null
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);
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}
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public void onRegistration(ServiceRegistry registry,
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Class<?> category) {
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if (registered) {
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return;
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}
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/*
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try {
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java.security.AccessController.doPrivileged(
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new sun.security.action.LoadLibraryAction("jpeg"));
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// Stuff it all into one lib for first pass
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//java.security.AccessController.doPrivileged(
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//new sun.security.action.LoadLibraryAction("imageioIJG"));
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} catch (Throwable e) { // Fail on any Throwable
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// if it can't be loaded, deregister and return
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registry.deregisterServiceProvider(this);
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return;
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}
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*/
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registered = true;
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}
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public String getDescription(Locale locale) {
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return "Standard JPEG Image Reader";
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}
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public boolean canDecodeInput(Object source) throws IOException {
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if (!(source instanceof ImageInputStream)) {
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return false;
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}
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ImageInputStream iis = (ImageInputStream) source;
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iis.mark();
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// If the first two bytes are a JPEG SOI marker, it's probably
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// a JPEG file. If they aren't, it definitely isn't a JPEG file.
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int byte1 = iis.read();
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int byte2 = iis.read();
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iis.reset();
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if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
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return true;
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}
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return false;
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}
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public ImageReader createReaderInstance(Object extension)
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throws IIOException {
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return new JPEGImageReader(this);
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}
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}
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