1 /*
2 * $RCSfile: WBMPImageReaderSpi.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: 1.3 $
42 * $Date: 2006/04/21 00:02:53 $
43 * $State: Exp $
44 */
45 package com.github.jaiimageio.impl.plugins.wbmp;
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.ImageUtil;
57 import com.github.jaiimageio.impl.common.PackageUtil;
58
59 public class WBMPImageReaderSpi extends ImageReaderSpi {
60
61 private static String [] writerSpiNames =
62 {"com.github.jaiimageio.impl.plugins.wbmp.WBMPImageWriterSpi"};
63 private static String[] formatNames = {"wbmp", "WBMP"};
64 private static String[] entensions = {"wbmp"};
65 private static String[] mimeType = {"image/vnd.wap.wbmp"};
66
67 private boolean registered = false;
68
69 public WBMPImageReaderSpi() {
70 super(PackageUtil.getVendor(),
71 PackageUtil.getVersion(),
72 formatNames,
73 entensions,
74 mimeType,
75 "com.github.jaiimageio.impl.plugins.wbmp.WBMPImageReader",
76 STANDARD_INPUT_TYPE,
77 writerSpiNames,
78 true,
79 null, null, null, null,
80 true,
81 WBMPMetadata.nativeMetadataFormatName,
82 "com.github.jaiimageio.impl.plugins.wbmp.WBMPMetadataFormat",
83 null, null);
84 }
85
86 public void onRegistration(ServiceRegistry registry,
87 Class category) {
88 if (registered) {
89 return;
90 }
91 registered = true;
92
93 // By JDK 1.7, the WBMPImageReader will have been in JDK core for
94 // atleast two FCS releases, so we can set JIIO's to lower priority
95 // With JDK 1.8, we can entirely de-register the JIIO one
96 ImageUtil.processOnRegistration(registry, category, "WBMP", this,
97 8, 7); // JDK version 1.8, 1.7
98 }
99
100 public String getDescription(Locale locale) {
101 String desc = PackageUtil.getSpecificationTitle() +
102 " WBMP Image Reader";
103 return desc;
104 }
105
106 public boolean canDecodeInput(Object source) throws IOException {
107 if (!(source instanceof ImageInputStream)) {
108 return false;
109 }
110
111 ImageInputStream stream = (ImageInputStream)source;
112
113 stream.mark();
114 int type = stream.readByte(); // TypeField
115 byte fixHeaderField = stream.readByte();
116
117 int width = ImageUtil.readMultiByteInteger(stream);
118 int height = ImageUtil.readMultiByteInteger(stream);
119
120 long remainingBytes = stream.length() - stream.getStreamPosition();
121 stream.reset();
122
123 // check WBMP "header"
124 if (type != 0 || fixHeaderField != 0) {
125 // while WBMP reader does not support ext WBMP headers
126 return false;
127 }
128
129 // check image dimension
130 if (width <= 0 || height <= 0) {
131 return false;
132 }
133
134 long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);
135
136 return (remainingBytes == scanSize * height);
137 }
138
139 public ImageReader createReaderInstance(Object extension)
140 throws IIOException {
141 return new WBMPImageReader(this);
142 }
143 }
144
145