FFmpeg/libavcodec/lzw.h
Steinar H. Gunderson 80286671c5 avcodec/put_bits: Fix LZW warning
lzwenc stores a function pointer to either put_bits or put_bits_le;
however, after the recent change, the function pointer's prototype
would depend on BitBuf. BitBuf is defined in put_bits.h, whose
definition depends on whether BITSTREAM_WRITER_LE is #defined or not.
For safety, we set a boolean flag for little/big endian instead,
which also allows the definition to be inlined.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2020-07-20 18:41:09 +02:00

62 lines
1.9 KiB
C

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