blob: 6af8a6b83a65efb8dbed5550016cf261e785a189
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 | int 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 */ |
64 |