60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
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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 lzw.h
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* @brief LZW decoding routines
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* @author Fabrice Bellard
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* Modified for use in TIFF by Konstantin Shishkov
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*/
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#ifndef FFMPEG_LZW_H
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#define FFMPEG_LZW_H
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#include "bitstream.h"
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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, 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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uint8_t* ff_lzw_cur_ptr(LZWState *lzw);
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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, int maxbits);
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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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#endif /* FFMPEG_LZW_H */
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