001: /*
002: * $RCSfile: TIFFDeflateDecompressor.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: 1.1 $
042: * $Date: 2005/02/11 05:01:45 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.plugins.tiff;
046:
047: import java.io.IOException;
048: import java.util.zip.DataFormatException;
049: import java.util.zip.Inflater;
050: import javax.imageio.IIOException;
051: import com.sun.media.imageio.plugins.tiff.BaselineTIFFTagSet;
052: import com.sun.media.imageio.plugins.tiff.TIFFDecompressor;
053:
054: public class TIFFDeflateDecompressor extends TIFFDecompressor {
055:
056: private static final boolean DEBUG = false;
057:
058: Inflater inflater = null;
059: int predictor;
060:
061: public TIFFDeflateDecompressor(int predictor) throws IIOException {
062: inflater = new Inflater();
063:
064: if (predictor != BaselineTIFFTagSet.PREDICTOR_NONE
065: && predictor != BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) {
066: throw new IIOException("Illegal value for Predictor in "
067: + "TIFF file");
068: }
069:
070: if (DEBUG) {
071: System.out
072: .println("Using horizontal differencing predictor");
073: }
074:
075: this .predictor = predictor;
076: }
077:
078: public synchronized void decodeRaw(byte[] b, int dstOffset,
079: int bitsPerPixel, int scanlineStride) throws IOException {
080:
081: // Check bitsPerSample.
082: if (predictor == BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) {
083: int len = bitsPerSample.length;
084: for (int i = 0; i < len; i++) {
085: if (bitsPerSample[i] != 8) {
086: throw new IIOException(bitsPerSample[i]
087: + "-bit samples "
088: + "are not supported for Horizontal "
089: + "differencing Predictor");
090: }
091: }
092: }
093:
094: // Seek to current tile data offset.
095: stream.seek(offset);
096:
097: // Read the deflated data.
098: byte[] srcData = new byte[byteCount];
099: stream.readFully(srcData);
100:
101: int bytesPerRow = (srcWidth * bitsPerPixel + 7) / 8;
102: byte[] buf;
103: int bufOffset;
104: if (bytesPerRow == scanlineStride) {
105: buf = b;
106: bufOffset = dstOffset;
107: } else {
108: buf = new byte[bytesPerRow * srcHeight];
109: bufOffset = 0;
110: }
111:
112: // Set the input to the Inflater.
113: inflater.setInput(srcData);
114:
115: // Inflate the data.
116: try {
117: inflater.inflate(buf, bufOffset, bytesPerRow * srcHeight);
118: } catch (DataFormatException dfe) {
119: throw new IIOException(I18N
120: .getString("TIFFDeflateDecompressor0"), dfe);
121: }
122:
123: // Reset the Inflater.
124: inflater.reset();
125:
126: if (predictor == BaselineTIFFTagSet.PREDICTOR_HORIZONTAL_DIFFERENCING) {
127:
128: for (int j = 0; j < srcHeight; j++) {
129: int count = bufOffset + samplesPerPixel
130: * (j * srcWidth + 1);
131: for (int i = samplesPerPixel; i < srcWidth
132: * samplesPerPixel; i++) {
133: buf[count] += buf[count - samplesPerPixel];
134: count++;
135: }
136: }
137: }
138:
139: if (bytesPerRow != scanlineStride) {
140: if (DEBUG) {
141: System.out.println("bytesPerRow != scanlineStride");
142: }
143: int off = 0;
144: for (int y = 0; y < srcHeight; y++) {
145: System.arraycopy(buf, off, b, dstOffset, bytesPerRow);
146: off += bytesPerRow;
147: dstOffset += scanlineStride;
148: }
149: }
150: }
151: }
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