+
−/*
+
− * 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);
+
−}