lzw.h 2.09 KB
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/*
 * LZW decoder
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 * Copyright (c) 2003 Fabrice Bellard
 * Copyright (c) 2006 Konstantin Shishkov
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; 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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 * @file
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 * @brief LZW decoding routines
 * @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
#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{
    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);
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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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const 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 */
struct LZWEncodeState;
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, enum FF_LZW_MODES mode,
                        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,
                        void (*lzw_flush_put_bits)(struct PutBitContext *));
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#endif /* AVCODEC_LZW_H */