libavcodec/lzw.h

   1 /*
   2  * LZW decoder
   3  * Copyright (c) 2003 Fabrice Bellard
   4  * Copyright (c) 2006 Konstantin Shishkov
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * @brief LZW decoding routines
  26  * @author Fabrice Bellard
  27  * @author modified for use in TIFF by Konstantin Shishkov
  28  */
  29
  30 #ifndef AVCODEC_LZW_H
  31 #define AVCODEC_LZW_H
  32
  33 #include <stdint.h>
  34
  35 struct PutBitContext;
  36
  37 enum FF_LZW_MODES{
  38     FF_LZW_GIF,
  39     FF_LZW_TIFF
  40 };
  41
  42 /* clients should not know what LZWState is */
  43 typedef void LZWState;
  44
  45 /* first two functions de/allocate memory for LZWState */
  46 void ff_lzw_decode_open(LZWState **p);
  47 void ff_lzw_decode_close(LZWState **p);
  48 int ff_lzw_decode_init(LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode);
  49 int ff_lzw_decode(LZWState *s, uint8_t *buf, int len);
  50 const uint8_t* ff_lzw_cur_ptr(LZWState *lzw);
  51 void ff_lzw_decode_tail(LZWState *lzw);
  52
  53 /** LZW encode state */
  54 struct LZWEncodeState;
  55 extern const int ff_lzw_encode_state_size;
  56
  57 void ff_lzw_encode_init(struct LZWEncodeState *s, uint8_t *outbuf, int outsize,
  58                         int maxbits, enum FF_LZW_MODES mode,
  59                         void (*lzw_put_bits)(struct PutBitContext *, int, unsigned int));
  60 int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize);
  61 int ff_lzw_encode_flush(struct LZWEncodeState *s,
  62                         void (*lzw_flush_put_bits)(struct PutBitContext *));
  63
  64 #endif /* AVCODEC_LZW_H */