deps/libchdr/bitstream.h

   1 // license:BSD-3-Clause\r
   2 // copyright-holders:Aaron Giles\r
   3 /***************************************************************************\r
   4 \r
   5     bitstream.h\r
   6 \r
   7     Helper classes for reading/writing at the bit level.\r
   8 \r
   9 ***************************************************************************/\r
  10 \r
  11 #pragma once\r
  12 \r
  13 #ifndef __BITSTREAM_H__\r
  14 #define __BITSTREAM_H__\r
  15 \r
  16 #include <stdint.h>\r
  17 \r
  18 //**************************************************************************\r
  19 //  TYPE DEFINITIONS\r
  20 //**************************************************************************\r
  21 \r
  22 // helper class for reading from a bit buffer\r
  23 struct bitstream\r
  24 {\r
  25         uint32_t          buffer;       // current bit accumulator\r
  26         int               bits;         // number of bits in the accumulator\r
  27         const uint8_t *   read;         // read pointer\r
  28         uint32_t          doffset;      // byte offset within the data\r
  29         uint32_t          dlength;      // length of the data\r
  30 };\r
  31 \r
  32 struct bitstream*       create_bitstream(const void *src, uint32_t srclength);\r
  33 int                             bitstream_overflow(struct bitstream* bitstream);\r
  34 uint32_t                        bitstream_read_offset(struct bitstream* bitstream);\r
  35 \r
  36 uint32_t                        bitstream_read(struct bitstream* bitstream, int numbits);\r
  37 uint32_t                        bitstream_peek(struct bitstream* bitstream, int numbits);\r
  38 void                            bitstream_remove(struct bitstream* bitstream, int numbits);\r
  39 uint32_t                        bitstream_flush(struct bitstream* bitstream);\r
  40 \r
  41 \r
  42 #endif\r