001: /*
002: * $RCSfile: J2KImageReaderSpi.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: import com.sun.medialib.codec.jiio.Util;
059:
060: public class J2KImageReaderSpi extends ImageReaderSpi {
061:
062: private static String[] writerSpiNames = { "com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageWriterSpi" };
063: private static String[] formatNames = { "jpeg 2000", "JPEG 2000",
064: "jpeg2000", "JPEG2000" };
065: private static String[] extensions = { "jp2" }; // Should add jpx or jpm
066: private static String[] mimeTypes = { "image/jp2", "image/jpeg2000" };
067: private boolean registered = false;
068:
069: public J2KImageReaderSpi() {
070: super (
071: PackageUtil.getVendor(),
072: PackageUtil.getVersion(),
073: formatNames,
074: extensions,
075: mimeTypes,
076: "com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReader",
077: STANDARD_INPUT_TYPE,
078: writerSpiNames,
079: false,
080: null,
081: null,
082: null,
083: null,
084: true,
085: "com_sun_media_imageio_plugins_jpeg2000_image_1.0",
086: "com.sun.media.imageioimpl.plugins.jpeg2000.J2KMetadataFormat",
087: null, null);
088: }
089:
090: public void onRegistration(ServiceRegistry registry, Class category) {
091: if (registered) {
092: return;
093: }
094:
095: registered = true;
096:
097: // Set pairwise ordering to give codecLib reader precedence.
098: Class codecLibReaderSPIClass = null;
099: try {
100: codecLibReaderSPIClass = Class
101: .forName("com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReaderCodecLibSpi");
102: } catch (Throwable t) {
103: // Ignore it.
104: }
105:
106: if (codecLibReaderSPIClass != null) {
107: Object codecLibReaderSPI = registry
108: .getServiceProviderByClass(codecLibReaderSPIClass);
109: if (codecLibReaderSPI != null) {
110: registry.setOrdering(category, codecLibReaderSPI, this );
111: }
112: }
113: }
114:
115: public String getDescription(Locale locale) {
116: String desc = PackageUtil.getSpecificationTitle()
117: + " JPEG 2000 Image Reader";
118: return desc;
119: }
120:
121: public boolean canDecodeInput(Object source) throws IOException {
122: if (!(source instanceof ImageInputStream)) {
123: return false;
124: }
125:
126: ImageInputStream stream = (ImageInputStream) source;
127:
128: //fix of 4938421
129: stream.mark();
130: int marker = (stream.read() << 8) | stream.read();
131:
132: if (marker == 0xFF4F) {
133: stream.reset();
134: return true;
135: }
136:
137: stream.reset();
138: stream.mark();
139: byte[] b = new byte[12];
140: stream.readFully(b);
141: stream.reset();
142:
143: //Verify the signature box
144:
145: // The length of the signature box is 12
146: if (b[0] != 0 || b[1] != 0 || b[2] != 0 || b[3] != 12)
147: return false;
148:
149: // The signature box type is "jP "
150: if ((b[4] & 0xff) != 0x6A || (b[5] & 0xFF) != 0x50
151: || (b[6] & 0xFF) != 0x20 || (b[7] & 0xFF) != 0x20)
152: return false;
153:
154: // The signture content is 0x0D0A870A
155: if ((b[8] & 0xFF) != 0x0D || (b[9] & 0xFF) != 0x0A
156: || (b[10] & 0xFF) != 0x87 || (b[11] & 0xFF) != 0x0A)
157: return false;
158:
159: return true;
160: }
161:
162: public ImageReader createReaderInstance(Object extension)
163: throws IIOException {
164: return new J2KImageReader(this);
165: }
166: }
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