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  1. /*
  2.  * LZW decoder
  3.  * Copyright (c) 2003 Fabrice Bellard
  4.  * Copyright (c) 2006 Konstantin Shishkov
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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. void ff_lzw_decode_tail(LZWState *lzw);
  51.  
  52. /** LZW encode state */
  53. struct LZWEncodeState;
  54. extern const int ff_lzw_encode_state_size;
  55.  
  56. void ff_lzw_encode_init(struct LZWEncodeState *s, uint8_t *outbuf, int outsize,
  57.                         int maxbits, enum FF_LZW_MODES mode,
  58.                         void (*lzw_put_bits)(struct PutBitContext *, int, unsigned int));
  59. int ff_lzw_encode(struct LZWEncodeState * s, const uint8_t * inbuf, int insize);
  60. int ff_lzw_encode_flush(struct LZWEncodeState *s,
  61.                         void (*lzw_flush_put_bits)(struct PutBitContext *));
  62.  
  63. #endif /* AVCODEC_LZW_H */
  64.