001: /*
002: * $RCSfile: J2KImageReaderCodecLibSpi.java,v $
003: *
004: *
005: * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * - Redistribution of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * - Redistribution in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * Neither the name of Sun Microsystems, Inc. or the names of
020: * contributors may be used to endorse or promote products derived
021: * from this software without specific prior written permission.
022: *
023: * This software is provided "AS IS," without a warranty of any
024: * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
025: * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
026: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027: * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
028: * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
029: * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030: * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
031: * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032: * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033: * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034: * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035: * POSSIBILITY OF SUCH DAMAGES.
036: *
037: * You acknowledge that this software is not designed or intended for
038: * use in the design, construction, operation or maintenance of any
039: * nuclear facility.
040: *
041: * $Revision: 1.2 $
042: * $Date: 2006/03/31 19:43:39 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.plugins.jpeg2000;
046:
047: import java.util.Locale;
048: import javax.imageio.spi.ImageReaderSpi;
049: import javax.imageio.stream.ImageInputStream;
050: import javax.imageio.spi.IIORegistry;
051: import javax.imageio.spi.ServiceRegistry;
052: import java.io.IOException;
053: import javax.imageio.ImageReader;
054: import javax.imageio.IIOException;
055:
056: import com.sun.media.imageioimpl.common.PackageUtil;
057:
058: public class J2KImageReaderCodecLibSpi extends ImageReaderSpi {
059:
060: private static String[] writerSpiNames = { "com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageWriterCodecLibSpi" };
061: private static String[] formatNames = { "jpeg 2000", "JPEG 2000",
062: "jpeg2000", "JPEG2000" };
063: private static String[] extensions = { "jp2" }; // Should add jpx or jpm
064: private static String[] mimeTypes = { "image/jp2", "image/jpeg2000" };
065: private boolean registered = false;
066:
067: public J2KImageReaderCodecLibSpi() {
068: super (
069: PackageUtil.getVendor(),
070: PackageUtil.getVersion(),
071: formatNames,
072: extensions,
073: mimeTypes,
074: "com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReaderCodecLib",
075: STANDARD_INPUT_TYPE,
076: writerSpiNames,
077: false,
078: null,
079: null,
080: null,
081: null,
082: true,
083: "com_sun_media_imageio_plugins_jpeg2000_image_1.0",
084: "com.sun.media.imageioimpl.plugins.jpeg2000.J2KMetadataFormat",
085: null, null);
086: }
087:
088: public void onRegistration(ServiceRegistry registry, Class category) {
089: if (registered) {
090: return;
091: }
092:
093: registered = true;
094:
095: // Branch based on codecLib availability.
096: if (!PackageUtil.isCodecLibAvailable()) {
097: // Deregister provider.
098: registry.deregisterServiceProvider(this );
099: } else {
100: // Set pairwise ordering to give codecLib reader precedence.
101: Class javaReaderSPIClass = null;
102: try {
103: javaReaderSPIClass = Class
104: .forName("com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReaderSpi");
105: } catch (Throwable t) {
106: // Ignore it.
107: }
108:
109: if (javaReaderSPIClass != null) {
110: Object javaReaderSPI = registry
111: .getServiceProviderByClass(javaReaderSPIClass);
112: if (javaReaderSPI != null) {
113: registry.setOrdering(category, this , javaReaderSPI);
114: }
115: }
116: }
117: }
118:
119: public String getDescription(Locale locale) {
120: String desc = PackageUtil.getSpecificationTitle()
121: + " natively-accelerated JPEG 2000 Image Reader";
122: return desc;
123: }
124:
125: public boolean canDecodeInput(Object source) throws IOException {
126: if (!(source instanceof ImageInputStream)) {
127: return false;
128: }
129:
130: ImageInputStream stream = (ImageInputStream) source;
131:
132: //fix of 4938421
133: stream.mark();
134: int marker = (stream.read() << 8) | stream.read();
135:
136: if (marker == 0xFF4F) {
137: stream.reset();
138: return true;
139: }
140:
141: stream.reset();
142: stream.mark();
143: byte[] b = new byte[12];
144: stream.readFully(b);
145: stream.reset();
146:
147: //Verify the signature box
148:
149: // The length of the signature box is 12
150: if (b[0] != 0 || b[1] != 0 || b[2] != 0 || b[3] != 12)
151: return false;
152:
153: // The signature box type is "jP "
154: if ((b[4] & 0xff) != 0x6A || (b[5] & 0xFF) != 0x50
155: || (b[6] & 0xFF) != 0x20 || (b[7] & 0xFF) != 0x20)
156: return false;
157:
158: // The signture content is 0x0D0A870A
159: if ((b[8] & 0xFF) != 0x0D || (b[9] & 0xFF) != 0x0A
160: || (b[10] & 0xFF) != 0x87 || (b[11] & 0xFF) != 0x0A)
161: return false;
162:
163: return true;
164: }
165:
166: public ImageReader createReaderInstance(Object extension)
167: throws IIOException {
168: return new J2KImageReaderCodecLib(this);
169: }
170: }
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