FreeCalypso > hg > gsm-codec-lib
view miscutil/bitmanip.c @ 122:b33f2168fdec
doc/EFR-rationale article written
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 10 Dec 2022 08:51:01 +0000 |
parents | 41f1ae68d253 |
children |
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/* * 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); }