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, int little_endian); 58 int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize); 59 int ff_lzw_encode_flush(struct LZWEncodeState *s); 60 61 #endif /* AVCODEC_LZW_H */ 62