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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 | |
25 | * @brief LZW decoding routines | |
26 | * @author Fabrice Bellard | |
27 | * @author modified for use in TIFF by Konstantin Shishkov | |
28 | */ | |
29 | ||
30 | #ifndef AVCODEC_LZW_H | |
31 | #define AVCODEC_LZW_H | |
32 | ||
33 | #include <stdint.h> | |
34 | ||
35 | struct PutBitContext; | |
36 | ||
37 | enum FF_LZW_MODES{ | |
38 | FF_LZW_GIF, | |
39 | FF_LZW_TIFF | |
40 | }; | |
41 | ||
42 | /* clients should not know what LZWState is */ | |
43 | typedef void LZWState; | |
44 | ||
45 | /* first two functions de/allocate memory for LZWState */ | |
46 | void ff_lzw_decode_open(LZWState **p); | |
47 | void ff_lzw_decode_close(LZWState **p); | |
48 | int ff_lzw_decode_init(LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode); | |
49 | int ff_lzw_decode(LZWState *s, uint8_t *buf, int len); | |
50 | void ff_lzw_decode_tail(LZWState *lzw); | |
51 | ||
52 | /** LZW encode state */ | |
53 | struct LZWEncodeState; | |
54 | extern const int ff_lzw_encode_state_size; | |
55 | ||
56 | void ff_lzw_encode_init(struct LZWEncodeState *s, uint8_t *outbuf, int outsize, | |
57 | int maxbits, enum FF_LZW_MODES mode, | |
58 | void (*lzw_put_bits)(struct PutBitContext *, int, unsigned int)); | |
59 | int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize); | |
60 | int ff_lzw_encode_flush(struct LZWEncodeState *s, | |
61 | void (*lzw_flush_put_bits)(struct PutBitContext *)); | |
62 | ||
63 | #endif /* AVCODEC_LZW_H */ |