001/*
002 * $RCSfile: TIFFPackBitsDecompressor.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 05:01:49 $
043 * $State: Exp $
044 */
045package com.github.jaiimageio.impl.plugins.tiff;
046
047import java.awt.Rectangle;
048import java.io.IOException;
049
050import javax.imageio.ImageReader;
051
052import com.github.jaiimageio.plugins.tiff.BaselineTIFFTagSet;
053import com.github.jaiimageio.plugins.tiff.TIFFDecompressor;
054import com.github.jaiimageio.plugins.tiff.TIFFTag;
055
056public class TIFFPackBitsDecompressor extends TIFFDecompressor {
057
058    private static final boolean DEBUG = false;
059
060    public TIFFPackBitsDecompressor() {
061    }
062
063    public int decode(byte[] srcData, int srcOffset,
064                      byte[] dstData, int dstOffset)
065        throws IOException {
066
067        int srcIndex = srcOffset;
068        int dstIndex = dstOffset;
069
070        int dstArraySize = dstData.length;
071        int srcArraySize = srcData.length;
072        try {
073            while (dstIndex < dstArraySize && srcIndex < srcArraySize) {
074                byte b = srcData[srcIndex++];
075            
076                if (b >= 0 && b <= 127) { // second test not needed?
077                    // Literal run packet
078                
079                    for (int i = 0; i < b + 1; i++) {
080                        dstData[dstIndex++] = srcData[srcIndex++];
081                    }
082                } else if (b <= -1 && b >= -127) {
083                    // 2-byte encoded run packet
084                    byte repeat = srcData[srcIndex++];
085                    for (int i = 0; i < (-b + 1); i++) {
086                        dstData[dstIndex++] = repeat;
087                    }
088                } else {
089                    // No-op packet, do nothing
090                    ++srcIndex;
091                }
092            }
093        } catch(ArrayIndexOutOfBoundsException e) {
094            if(reader instanceof TIFFImageReader) {
095                ((TIFFImageReader)reader).forwardWarningMessage
096                    ("ArrayIndexOutOfBoundsException ignored in TIFFPackBitsDecompressor.decode()");
097            }
098        }
099        
100        return dstIndex - dstOffset;
101    }
102
103    public void decodeRaw(byte[] b,
104                          int dstOffset,
105                          int bitsPerPixel,
106                          int scanlineStride) throws IOException {
107        stream.seek(offset);
108            
109        byte[] srcData = new byte[byteCount];
110        stream.readFully(srcData);
111
112        int bytesPerRow = (srcWidth*bitsPerPixel + 7)/8;
113        byte[] buf;
114        int bufOffset;
115        if(bytesPerRow == scanlineStride) {
116            buf = b;
117            bufOffset = dstOffset;
118        } else {
119            buf = new byte[bytesPerRow*srcHeight];
120            bufOffset = 0;
121        }
122
123        decode(srcData, 0, buf, bufOffset);
124
125        if(bytesPerRow != scanlineStride) {
126            if(DEBUG) {
127                System.out.println("bytesPerRow != scanlineStride");
128            }
129            int off = 0;
130            for (int y = 0; y < srcHeight; y++) {
131                System.arraycopy(buf, off, b, dstOffset, bytesPerRow);
132                off += bytesPerRow;
133                dstOffset += scanlineStride;
134            }
135        }
136    }
137}
138