2 * Copyright © 2024 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
19 #ifndef _AO_CRC_CCITT_H_
20 #define _AO_CRC_CCITT_H_
24 extern const uint16_t ao_crc16_ccitt_table[256];
26 static inline uint16_t ao_crc16_ccitt(uint16_t crc, uint8_t byte)
28 uint16_t high = crc << 8;
29 uint8_t low = (uint8_t) (crc >> 8) ^ byte;
30 return high ^ ao_crc16_ccitt_table[low];
33 #endif /* _AO_CRC_CCITT_H_ */