view miscutil/bitmanip.c @ 101:d86f866489e9

gsm-amr2efr utility written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Nov 2022 05:15:39 +0000
parents frtest/tidsp.c@7960744ba19c
children 41f1ae68d253
line wrap: on
line source

/*
 * This module provides two utility functions that serve as building blocks
 * for frame bit reordering operations.
 */

#include <stdint.h>

msb_get_bit(buf, bn)
	uint8_t *buf;
{
	int pos_byte = bn >> 3;
	int pos_bit  = 7 - (bn & 7);

	return (buf[pos_byte] >> pos_bit) & 1;
}

msb_set_bit(buf, bn, bit)
	uint8_t *buf;
{
	int pos_byte = bn >> 3;
	int pos_bit  = 7 - (bn & 7);

	buf[pos_byte] |= (bit << pos_bit);
}