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