001: /*
002: * $RCSfile: WBMPImageReaderSpi.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: 1.3 $
042: * $Date: 2006/04/21 00:02:53 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.plugins.wbmp;
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: import com.sun.media.imageioimpl.common.PackageUtil;
056: import com.sun.media.imageioimpl.common.ImageUtil;
057:
058: public class WBMPImageReaderSpi extends ImageReaderSpi {
059:
060: private static String[] writerSpiNames = { "com.sun.media.imageioimpl.plugins.wbmp.WBMPImageWriterSpi" };
061: private static String[] formatNames = { "wbmp", "WBMP" };
062: private static String[] entensions = { "wbmp" };
063: private static String[] mimeType = { "image/vnd.wap.wbmp" };
064:
065: private boolean registered = false;
066:
067: public WBMPImageReaderSpi() {
068: super (
069: PackageUtil.getVendor(),
070: PackageUtil.getVersion(),
071: formatNames,
072: entensions,
073: mimeType,
074: "com.sun.media.imageioimpl.plugins.wbmp.WBMPImageReader",
075: STANDARD_INPUT_TYPE,
076: writerSpiNames,
077: true,
078: null,
079: null,
080: null,
081: null,
082: true,
083: WBMPMetadata.nativeMetadataFormatName,
084: "com.sun.media.imageioimpl.plugins.wbmp.WBMPMetadataFormat",
085: null, null);
086: }
087:
088: public void onRegistration(ServiceRegistry registry, Class category) {
089: if (registered) {
090: return;
091: }
092: registered = true;
093:
094: // By JDK 1.7, the WBMPImageReader will have been in JDK core for
095: // atleast two FCS releases, so we can set JIIO's to lower priority
096: // With JDK 1.8, we can entirely de-register the JIIO one
097: ImageUtil.processOnRegistration(registry, category, "WBMP",
098: this , 8, 7); // JDK version 1.8, 1.7
099: }
100:
101: public String getDescription(Locale locale) {
102: String desc = PackageUtil.getSpecificationTitle()
103: + " WBMP Image Reader";
104: return desc;
105: }
106:
107: public boolean canDecodeInput(Object source) throws IOException {
108: if (!(source instanceof ImageInputStream)) {
109: return false;
110: }
111:
112: ImageInputStream stream = (ImageInputStream) source;
113:
114: stream.mark();
115: int type = stream.readByte(); // TypeField
116: byte fixHeaderField = stream.readByte();
117:
118: int width = ImageUtil.readMultiByteInteger(stream);
119: int height = ImageUtil.readMultiByteInteger(stream);
120:
121: long remainingBytes = stream.length()
122: - stream.getStreamPosition();
123: stream.reset();
124:
125: // check WBMP "header"
126: if (type != 0 || fixHeaderField != 0) {
127: // while WBMP reader does not support ext WBMP headers
128: return false;
129: }
130:
131: // check image dimension
132: if (width <= 0 || height <= 0) {
133: return false;
134: }
135:
136: long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);
137:
138: return (remainingBytes == scanSize * height);
139: }
140:
141: public ImageReader createReaderInstance(Object extension)
142: throws IIOException {
143: return new WBMPImageReader(this);
144: }
145: }
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