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 * 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 35struct PutBitContext; 36 37enum FF_LZW_MODES{ 38 FF_LZW_GIF, 39 FF_LZW_TIFF 40}; 41 42/* clients should not know what LZWState is */ 43typedef void LZWState; 44 45/* first two functions de/allocate memory for LZWState */ 46void ff_lzw_decode_open(LZWState **p); 47void ff_lzw_decode_close(LZWState **p); 48int ff_lzw_decode_init(LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode); 49int ff_lzw_decode(LZWState *s, uint8_t *buf, int len); 50const uint8_t* ff_lzw_cur_ptr(LZWState *lzw); 51void ff_lzw_decode_tail(LZWState *lzw); 52 53/** LZW encode state */ 54struct LZWEncodeState; 55extern const int ff_lzw_encode_state_size; 56 57void ff_lzw_encode_init(struct LZWEncodeState *s, uint8_t *outbuf, int outsize, 58 int maxbits, enum FF_LZW_MODES mode, 59 void (*lzw_put_bits)(struct PutBitContext *, int, unsigned int)); 60int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize); 61int ff_lzw_encode_flush(struct LZWEncodeState *s, 62 void (*lzw_flush_put_bits)(struct PutBitContext *)); 63 64#endif /* AVCODEC_LZW_H */ 65