/*
 * 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);

	if (bit)
		buf[pos_byte] |= (1 << pos_bit);
	else
		buf[pos_byte] &= ~(1 << pos_bit);
}