1 /*
2 * $RCSfile: PNMImageReaderSpi.java,v $
3 *
4 *
5 * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * - Redistribution of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * - Redistribution in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * Neither the name of Sun Microsystems, Inc. or the names of
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * This software is provided "AS IS," without a warranty of any
24 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
25 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
27 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
28 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
29 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
30 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
31 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
32 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
33 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
34 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGES.
36 *
37 * You acknowledge that this software is not designed or intended for
38 * use in the design, construction, operation or maintenance of any
39 * nuclear facility.
40 *
41 * $Revision: 1.2 $
42 * $Date: 2006/03/31 19:43:40 $
43 * $State: Exp $
44 */
45 package com.github.jaiimageio.impl.plugins.pnm;
46
47 import java.io.IOException;
48 import java.util.Locale;
49
50 import javax.imageio.IIOException;
51 import javax.imageio.ImageReader;
52 import javax.imageio.spi.ImageReaderSpi;
53 import javax.imageio.spi.ServiceRegistry;
54 import javax.imageio.stream.ImageInputStream;
55
56 import com.github.jaiimageio.impl.common.PackageUtil;
57
58 public class PNMImageReaderSpi extends ImageReaderSpi {
59
60 private static String [] writerSpiNames =
61 {"com.github.jaiimageio.impl.plugins.pnm.PNMImageWriterSpi"};
62 private static String[] formatNames = {"pnm", "PNM"};
63 private static String[] entensions = {"pbm", "pgm", "ppm"};
64 private static String[] mimeType = {"image/x-portable-anymap",
65 "image/x-portable-bitmap",
66 "image/x-portable-graymap",
67 "image/x-portable-pixmap"};
68
69 private boolean registered = false;
70
71 public PNMImageReaderSpi() {
72 super(PackageUtil.getVendor(),
73 PackageUtil.getVersion(),
74 formatNames,
75 entensions,
76 mimeType,
77 "com.github.jaiimageio.impl.plugins.pnm.PNMImageReader",
78 STANDARD_INPUT_TYPE,
79 writerSpiNames,
80 true,
81 null, null, null, null,
82 true,
83 null, null, null, null);
84 }
85
86 public void onRegistration(ServiceRegistry registry,
87 Class category) {
88 if (registered) {
89 return;
90 }
91 registered = true;
92 }
93
94 public String getDescription(Locale locale) {
95 String desc = PackageUtil.getSpecificationTitle() +
96 " PNM Image Reader";
97 return desc;
98 }
99
100 public boolean canDecodeInput(Object source) throws IOException {
101 if (!(source instanceof ImageInputStream)) {
102 return false;
103 }
104
105 ImageInputStream stream = (ImageInputStream)source;
106 byte[] b = new byte[2];
107
108 stream.mark();
109 stream.readFully(b);
110 stream.reset();
111
112 return (b[0] == 0x50) && (b[1] >= 0x31) && (b[1] <= 0x36);
113 }
114
115 public ImageReader createReaderInstance(Object extension)
116 throws IIOException {
117 return new PNMImageReader(this);
118 }
119 }
120
121