aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* LZW decoder
* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* @brief LZW decoding routines
* @author Fabrice Bellard
* @author modified for use in TIFF by Konstantin Shishkov
*/
#ifndef AVCODEC_LZW_H
#define AVCODEC_LZW_H
#include <stdint.h>
struct PutBitContext;
enum FF_LZW_MODES{
FF_LZW_GIF,
FF_LZW_TIFF
};
/* clients should not know what LZWState is */
typedef void LZWState;
/* first two functions de/allocate memory for LZWState */
void ff_lzw_decode_open(LZWState **p);
void ff_lzw_decode_close(LZWState **p);
int ff_lzw_decode_init(LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode);
int ff_lzw_decode(LZWState *s, uint8_t *buf, int len);
int ff_lzw_decode_tail(LZWState *lzw);
/** LZW encode state */
struct LZWEncodeState;
extern const int ff_lzw_encode_state_size;
void ff_lzw_encode_init(struct LZWEncodeState *s, uint8_t *outbuf, int outsize,
int maxbits, enum FF_LZW_MODES mode,
void (*lzw_put_bits)(struct PutBitContext *, int, unsigned int));
int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize);
int ff_lzw_encode_flush(struct LZWEncodeState *s,
void (*lzw_flush_put_bits)(struct PutBitContext *));
#endif /* AVCODEC_LZW_H */
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