1/*
2 * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package com.sun.imageio.plugins.tiff;
26
27import java.io.IOException;
28
29public class TIFFLSBDecompressor extends TIFFDecompressor {
30
31    /**
32     * Table for flipping bytes from LSB-to-MSB to MSB-to-LSB.
33     */
34    private static final byte[] flipTable = TIFFFaxDecompressor.flipTable;
35
36    public TIFFLSBDecompressor() {}
37
38    public void decodeRaw(byte[] b,
39                          int dstOffset,
40                          int bitsPerPixel,
41                          int scanlineStride) throws IOException {
42        stream.seek(offset);
43
44        int bytesPerRow = (srcWidth*bitsPerPixel + 7)/8;
45        if(bytesPerRow == scanlineStride) {
46            int numBytes = bytesPerRow*srcHeight;
47            stream.readFully(b, dstOffset, numBytes);
48            int xMax = dstOffset + numBytes;
49            for (int x = dstOffset; x < xMax; x++) {
50                b[x] = flipTable[b[x]&0xff];
51            }
52        } else {
53            for (int y = 0; y < srcHeight; y++) {
54                stream.readFully(b, dstOffset, bytesPerRow);
55                int xMax = dstOffset + bytesPerRow;
56                for (int x = dstOffset; x < xMax; x++) {
57                    b[x] = flipTable[b[x]&0xff];
58                }
59                dstOffset += scanlineStride;
60            }
61        }
62    }
63}
64