1/*
2 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.imageio.plugins.jpeg;
27
28import java.util.Locale;
29import javax.imageio.spi.ImageReaderSpi;
30import javax.imageio.stream.ImageInputStream;
31import javax.imageio.spi.IIORegistry;
32import javax.imageio.spi.ServiceRegistry;
33import java.io.IOException;
34import javax.imageio.ImageReader;
35import javax.imageio.IIOException;
36
37public class JPEGImageReaderSpi extends ImageReaderSpi {
38
39    private static String [] writerSpiNames =
40        {"com.sun.imageio.plugins.jpeg.JPEGImageWriterSpi"};
41
42    public JPEGImageReaderSpi() {
43        super(JPEG.vendor,
44              JPEG.version,
45              JPEG.names,
46              JPEG.suffixes,
47              JPEG.MIMETypes,
48              "com.sun.imageio.plugins.jpeg.JPEGImageReader",
49              new Class<?>[] { ImageInputStream.class },
50              writerSpiNames,
51              true,
52              JPEG.nativeStreamMetadataFormatName,
53              JPEG.nativeStreamMetadataFormatClassName,
54              null, null,
55              true,
56              JPEG.nativeImageMetadataFormatName,
57              JPEG.nativeImageMetadataFormatClassName,
58              null, null
59              );
60    }
61
62    public String getDescription(Locale locale) {
63        return "Standard JPEG Image Reader";
64    }
65
66    public boolean canDecodeInput(Object source) throws IOException {
67        if (!(source instanceof ImageInputStream)) {
68            return false;
69        }
70        ImageInputStream iis = (ImageInputStream) source;
71        iis.mark();
72        // If the first two bytes are a JPEG SOI marker, it's probably
73        // a JPEG file.  If they aren't, it definitely isn't a JPEG file.
74        int byte1 = iis.read();
75        int byte2 = iis.read();
76        iis.reset();
77        if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
78            return true;
79        }
80        return false;
81    }
82
83    public ImageReader createReaderInstance(Object extension)
84        throws IIOException {
85        return new JPEGImageReader(this);
86    }
87
88}
89