52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
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/**************************************************************************
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*
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* FILE bitfunc.h
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* Copyright (c) 2009-2011, 2013-2015 Daniel Kahlin <daniel@kahlin.net>
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* Written by Daniel Kahlin <daniel@kahlin.net>
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*
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* DESCRIPTION
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* bitstream read/write functions.
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*
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******/
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#ifndef BITFUNC_H
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#define BITFUNC_H
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#include <stdint.h>
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#define BITMODE_SIDEBYTE (1<<0)
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#define BITMODE_PRESHIFT (1<<1)
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//#define BITMODE_ROR (1<<2)
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/* bit writer */
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typedef struct {
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uint8_t *ptr;
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int pos;
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int bits;
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uint8_t buf;
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int bit;
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int bpos;
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unsigned int flags;
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} BitWriteState;
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void bitwr_init(BitWriteState *bws, uint8_t *destbuf, unsigned int flags);
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void bitwr_write(BitWriteState *bws, uint32_t data, int n);
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void bitwr_write8s(BitWriteState *bws, uint8_t data);
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int bitwr_flush(BitWriteState *bws);
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/* bit reader */
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typedef struct {
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uint8_t *ptr;
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int pos;
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int bits;
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uint8_t buf;
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int bit;
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unsigned int flags;
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} BitReadState;
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void bitrd_init(BitReadState *brs, uint8_t *srcbuf, unsigned int flags);
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uint32_t bitrd_read(BitReadState *brs, int n);
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uint8_t bitrd_read8s(BitReadState *brs);
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#endif /* BITFUNC_H */
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/* eof */
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