161f0dce5615c079df98a51f61c13625b8475b90
[libav.git] / libavcodec / lzw.h
1 /*
2 * LZW decoder
3 * Copyright (c) 2003 Fabrice Bellard.
4 * Copyright (c) 2006 Konstantin Shishkov.
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file lzw.h
25 * @brief LZW decoding routines
26 * @author Fabrice Bellard
27 * Modified for use in TIFF by Konstantin Shishkov
28 */
29
30 #ifndef FFMPEG_LZW_H
31 #define FFMPEG_LZW_H
32
33 #include "bitstream.h"
34
35 enum FF_LZW_MODES{
36 FF_LZW_GIF,
37 FF_LZW_TIFF
38 };
39
40 /* clients should not know what LZWState is */
41 typedef void LZWState;
42
43 /* first two functions de/allocate memory for LZWState */
44 void ff_lzw_decode_open(LZWState **p);
45 void ff_lzw_decode_close(LZWState **p);
46 int ff_lzw_decode_init(LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode);
47 int ff_lzw_decode(LZWState *s, uint8_t *buf, int len);
48 const uint8_t* ff_lzw_cur_ptr(LZWState *lzw);
49 void ff_lzw_decode_tail(LZWState *lzw);
50
51 /** LZW encode state */
52 struct LZWEncodeState;
53 extern const int ff_lzw_encode_state_size;
54
55 void ff_lzw_encode_init(struct LZWEncodeState * s, uint8_t * outbuf, int outsize, int maxbits);
56 int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize);
57 int ff_lzw_encode_flush(struct LZWEncodeState * s);
58
59 #endif /* FFMPEG_LZW_H */