lib/bitio.h

   1 /* bitio.h
   2    Generic object-oriented reading/writing.
   3
   4    Part of the swftools package.
   5
   6    Copyright (c) 2001 Matthias Kramm <kramm@quiss.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program 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
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  21
  22 #include <stdio.h>
  23
  24 #ifndef __rfxswf_bitio_h__
  25 #define __rfxswf_bitio_h__
  26
  27 #define READER_TYPE_FILE 0
  28 #define READER_TYPE_MEM  1
  29 #define READER_TYPE_ZLIB_U 2
  30 #define READER_TYPE_ZLIB_C 3
  31 #define READER_TYPE_ZLIB READER_TYPE_ZLIB_U
  32
  33 #define WRITER_TYPE_FILE 0
  34 #define WRITER_TYPE_MEM  1
  35 #define WRITER_TYPE_ZLIB_C 2
  36 #define WRITER_TYPE_ZLIB_U 3
  37 #define WRITER_TYPE_NULL 4
  38 #define WRITER_TYPE_ZLIB WRITER_TYPE_ZLIB_C
  39
  40 struct reader_t
  41 {
  42     int (*read)(struct reader_t*, void*data, int len);
  43
  44     void *internal;
  45     int type;
  46     unsigned char mybyte;
  47     unsigned char bitpos;
  48     int pos;
  49 };
  50
  51 struct writer_t
  52 {
  53     int (*write)(struct writer_t*, void*data, int len);
  54     void (*finish)(struct writer_t*);
  55
  56     void *internal;
  57     int type;
  58     unsigned char mybyte;
  59     unsigned char bitpos;
  60     int pos;
  61 };
  62
  63 void reader_resetbits(struct reader_t*r);
  64 unsigned int reader_readbit(struct reader_t*r);
  65 unsigned int reader_readbits(struct reader_t*r, int num);
  66
  67 void writer_resetbits(struct writer_t*w);
  68 void writer_writebit(struct writer_t*w, int bit);
  69 void writer_writebits(struct writer_t*w, unsigned int data, int bits);
  70
  71 /* standard readers / writers */
  72
  73 void reader_init_filereader(struct reader_t*r, int handle);
  74 void reader_init_zlibinflate(struct reader_t*r, struct reader_t*input);
  75 void reader_init_memreader(struct reader_t*r, void*data, int length);
  76
  77 void writer_init_filewriter(struct writer_t*w, int handle);
  78 void writer_init_filewriter2(struct writer_t*w, char*filename);
  79 void writer_init_zlibdeflate(struct writer_t*w, struct writer_t*output);
  80 void writer_init_memwriter(struct writer_t*r, void*data, int length);
  81 void writer_init_nullwriter(struct writer_t*w);
  82
  83 #endif //__rfxswf_bitio_h__