001/*
002 * $RCSfile: TIFFLSBDecompressor.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 05:01:48 $
043 * $State: Exp $
044 */
045package com.github.jaiimageio.impl.plugins.tiff;
046
047import java.io.IOException;
048
049import com.github.jaiimageio.plugins.tiff.TIFFDecompressor;
050
051public class TIFFLSBDecompressor extends TIFFDecompressor {
052
053    /**
054     * Table for flipping bytes from LSB-to-MSB to MSB-to-LSB.
055     */
056    private static byte[] flipTable = TIFFFaxDecompressor.flipTable;
057
058    public TIFFLSBDecompressor() {}
059
060    public void decodeRaw(byte[] b,
061                          int dstOffset,
062                          int bitsPerPixel,
063                          int scanlineStride) throws IOException {
064        stream.seek(offset);
065
066        int bytesPerRow = (srcWidth*bitsPerPixel + 7)/8;
067        if(bytesPerRow == scanlineStride) {
068            int numBytes = bytesPerRow*srcHeight;
069            stream.readFully(b, dstOffset, numBytes);
070            int xMax = dstOffset + numBytes;
071            for (int x = dstOffset; x < xMax; x++) {
072                b[x] = flipTable[b[x]&0xff];
073            }
074        } else {
075            for (int y = 0; y < srcHeight; y++) {
076                stream.readFully(b, dstOffset, bytesPerRow);
077                int xMax = dstOffset + bytesPerRow;
078                for (int x = dstOffset; x < xMax; x++) {
079                    b[x] = flipTable[b[x]&0xff];
080                }
081                dstOffset += scanlineStride;
082            }
083        }
084    }
085}