/*------------------------------------------------------------------------------

    File    :	BitStream.h

    Author  :	Stéphane TAVENARD

    $VER:   BitStream.h  1.0  (23/06/1995)

    (C) Copyright 1995-1995 Stéphane TAVENARD
	All Rights Reserved

    #Rev|   Date   |			  Comment
    ----|----------|--------------------------------------------------------
    0	|12/04/1995| Initial revision					  ST
    1	|03/06/1995| First release (no more C code)                       ST
    2	|23/06/1995| Aminet release					  ST

    ------------------------------------------------------------------------

    C Defintion of BitStream files handling

------------------------------------------------------------------------------*/

#ifndef BITSTREAM_H
#define BITSTREAM_H

#include <dos/dos.h>

typedef struct {
   BPTR file_ptr;
   int mode;
   int buffer_size;
   char *buffer;
   int current_bit_index;
   int remaining_bits;
   unsigned long bitstream_size;
   int end_of_stream;
} BITSTREAM;

#define BSTR_MAX_BITS	      32

#define BSTR_MODE_READ	0
#define BSTR_MODE_WRITE 1

#ifndef ASM
#ifdef __SASC
#define ASM_A0 register __a0
#define ASM_A1 register __a1
#define ASM_A2 register __a2
#define ASM_A3 register __a3
#define ASM_A4 register __a4
#define ASM_A5 register __a5
#define ASM_A6 register __a6
#define ASM_D0 register __d0
#define ASM_D1 register __d1
#define ASM_D2 register __d2
#define ASM_D3 register __d3
#define ASM_D4 register __d4
#define ASM_D5 register __d5
#define ASM_D6 register __d6
#define ASM_D7 register __d7
#define ASM __asm
#else
#define ASM_A0 __A0
#define ASM_A1 __A1
#define ASM_A2 __A2
#define ASM_A3 __A3
#define ASM_A4 __A4
#define ASM_A5 __A5
#define ASM_A6 __A6
#define ASM_D0 __D0
#define ASM_D1 __D1
#define ASM_D2 __D2
#define ASM_D3 __D3
#define ASM_D4 __D4
#define ASM_D5 __D5
#define ASM_D6 __D6
#define ASM_D7 __D7
#define ASM
#endif
#endif

void BSTR_close( ASM_A0 BITSTREAM *bitstream );
BITSTREAM *BSTR_open( ASM_A0 char *filename,
		      ASM_D0 unsigned int buffer_size,
		      ASM_D1 int mode );

int BSTR_rewind( ASM_A0 BITSTREAM *bitstream );
int BSTR_end( ASM_A0 BITSTREAM *bitstream );
unsigned int BSTR_seek_tell( ASM_A0 BITSTREAM *bitstream );

unsigned int ASM BSTR_read_bit( ASM_A0 BITSTREAM *bitstream );
unsigned int ASM BSTR_read_bits( ASM_A0 BITSTREAM *bitstream,
				 ASM_D1 unsigned int bit_count );
int ASM BSTR_read_signed_bits( ASM_A0 BITSTREAM *bitstream,
			       ASM_D1 unsigned int bit_count );
unsigned int ASM BSTR_skip_bits( ASM_A0 BITSTREAM *bitstream,
				 ASM_D1 unsigned int bit_count );

int ASM BSTR_seek_sync( ASM_A0 BITSTREAM *bitstream,
			ASM_D0 unsigned int sync_value,
			ASM_D1 unsigned int sync_length );

#endif