- /*
- * @(#)JPEGImageReaderSpi.java 1.6 03/01/23
- *
- * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
-
- package com.sun.imageio.plugins.jpeg;
-
- 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 JPEGImageReaderSpi extends ImageReaderSpi {
-
- private static String [] writerSpiNames =
- {"com.sun.imageio.plugins.jpeg.JPEGImageWriterSpi"};
-
- private boolean registered = false;
-
- public JPEGImageReaderSpi() {
- super(JPEG.vendor,
- JPEG.version,
- JPEG.names,
- JPEG.suffixes,
- JPEG.MIMETypes,
- "com.sun.imageio.plugins.jpeg.JPEGImageReader",
- STANDARD_INPUT_TYPE,
- writerSpiNames,
- true,
- JPEG.nativeStreamMetadataFormatName,
- JPEG.nativeStreamMetadataFormatClassName,
- null, null,
- true,
- JPEG.nativeImageMetadataFormatName,
- JPEG.nativeImageMetadataFormatClassName,
- null, null
- );
- }
-
- public void onRegistration(ServiceRegistry registry,
- Class category) {
- if (registered) {
- return;
- }
- try {
- java.security.AccessController.doPrivileged(
- new sun.security.action.LoadLibraryAction("jpeg"));
- // Stuff it all into one lib for first pass
- //java.security.AccessController.doPrivileged(
- //new sun.security.action.LoadLibraryAction("imageioIJG"));
- } catch (Throwable e) { // Fail on any Throwable
- // if it can't be loaded, deregister and return
- registry.deregisterServiceProvider(this);
- return;
- }
-
- registered = true;
- }
-
- public String getDescription(Locale locale) {
- return "Standard JPEG Image Reader";
- }
-
- public boolean canDecodeInput(Object source) throws IOException {
- if (!(source instanceof ImageInputStream)) {
- return false;
- }
- ImageInputStream iis = (ImageInputStream) source;
- iis.mark();
- // If the first two bytes are a JPEG SOI marker, it's probably
- // a JPEG file. If they aren't, it definitely isn't a JPEG file.
- int byte1 = iis.read();
- int byte2 = iis.read();
- iis.reset();
- if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
- return true;
- }
- return false;
- }
-
- public ImageReader createReaderInstance(Object extension)
- throws IIOException {
- return new JPEGImageReader(this);
- }
-
- }