[pcsx_rearmed.git] / deps / libchdr / include / libchdr / bitstream.h

/* license:BSD-3-Clause
 * copyright-holders:Aaron Giles
***************************************************************************

    bitstream.h

    Helper classes for reading/writing at the bit level.

***************************************************************************/

#pragma once

#ifndef __BITSTREAM_H__
#define __BITSTREAM_H__

#include <stdint.h>

/***************************************************************************
 *  TYPE DEFINITIONS
 ***************************************************************************
 */

/* helper class for reading from a bit buffer */
struct bitstream
{
	uint32_t          buffer;       /* current bit accumulator */
	int               bits;         /* number of bits in the accumulator */
	const uint8_t *   read;         /* read pointer */
	uint32_t          doffset;      /* byte offset within the data */
	uint32_t          dlength;      /* length of the data */
};

struct bitstream* 	create_bitstream(const void *src, uint32_t srclength);
int 				bitstream_overflow(struct bitstream* bitstream);
uint32_t 			bitstream_read_offset(struct bitstream* bitstream);

uint32_t 			bitstream_read(struct bitstream* bitstream, int numbits);
uint32_t 			bitstream_peek(struct bitstream* bitstream, int numbits);
void 				bitstream_remove(struct bitstream* bitstream, int numbits);
uint32_t 			bitstream_flush(struct bitstream* bitstream);


#endif
Commit	Line	Data
9c659ffe	1	/* license:BSD-3-Clause
	2	* copyright-holders:Aaron Giles
	3	***************************************************************************
	4
	5	bitstream.h
	6
	7	Helper classes for reading/writing at the bit level.
	8
	9	***************************************************************************/
	10
	11	#pragma once
	12
	13	#ifndef __BITSTREAM_H__
	14	#define __BITSTREAM_H__
	15
	16	#include <stdint.h>
	17
	18	/***************************************************************************
	19	* TYPE DEFINITIONS
	20	***************************************************************************
	21	*/
	22
	23	/* helper class for reading from a bit buffer */
	24	struct bitstream
	25	{
	26	uint32_t buffer; /* current bit accumulator */
	27	int bits; /* number of bits in the accumulator */
	28	const uint8_t * read; /* read pointer */
	29	uint32_t doffset; /* byte offset within the data */
	30	uint32_t dlength; /* length of the data */
	31	};
	32
	33	struct bitstream* create_bitstream(const void *src, uint32_t srclength);
	34	int bitstream_overflow(struct bitstream* bitstream);
	35	uint32_t bitstream_read_offset(struct bitstream* bitstream);
	36
	37	uint32_t bitstream_read(struct bitstream* bitstream, int numbits);
	38	uint32_t bitstream_peek(struct bitstream* bitstream, int numbits);
	39	void bitstream_remove(struct bitstream* bitstream, int numbits);
	40	uint32_t bitstream_flush(struct bitstream* bitstream);
	41
	42
	43	#endif