2017-09-06 19:07:42 +02:00
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/* license:BSD-3-Clause
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* copyright-holders:Aaron Giles
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***************************************************************************
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2017-08-27 16:42:31 +02:00
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bitstream.h
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Helper classes for reading/writing at the bit level.
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***************************************************************************/
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#pragma once
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#ifndef __BITSTREAM_H__
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#define __BITSTREAM_H__
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#include <stdint.h>
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2017-09-06 19:07:42 +02:00
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/***************************************************************************
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* TYPE DEFINITIONS
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***************************************************************************
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*/
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2017-08-27 16:42:31 +02:00
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2017-09-06 19:07:42 +02:00
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/* helper class for reading from a bit buffer */
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2017-08-27 16:42:31 +02:00
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struct bitstream
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{
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2017-09-06 19:07:42 +02:00
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uint32_t buffer; /* current bit accumulator */
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int bits; /* number of bits in the accumulator */
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const uint8_t * read; /* read pointer */
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uint32_t doffset; /* byte offset within the data */
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uint32_t dlength; /* length of the data */
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2017-08-27 16:42:31 +02:00
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};
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struct bitstream* create_bitstream(const void *src, uint32_t srclength);
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int bitstream_overflow(struct bitstream* bitstream);
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uint32_t bitstream_read_offset(struct bitstream* bitstream);
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uint32_t bitstream_read(struct bitstream* bitstream, int numbits);
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uint32_t bitstream_peek(struct bitstream* bitstream, int numbits);
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void bitstream_remove(struct bitstream* bitstream, int numbits);
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uint32_t bitstream_flush(struct bitstream* bitstream);
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#endif
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