src/main/common/crc.h

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #pragma once
  22
  23 struct sbuf_s;
  24
  25 uint16_t crc16_ccitt(uint16_t crc, unsigned char a);
  26 uint16_t crc16_ccitt_update(uint16_t crc, const void *data, uint32_t length);
  27 struct sbuf_s;
  28 void crc16_ccitt_sbuf_append(struct sbuf_s *dst, uint8_t *start);
  29
  30 uint8_t crc8_calc(uint8_t crc, unsigned char a, uint8_t poly);
  31 uint8_t crc8_update(uint8_t crc, const void *data, uint32_t length, uint8_t poly);
  32 void crc8_sbuf_append(struct sbuf_s *dst, uint8_t *start, uint8_t poly);
  33 #define crc8_dvb_s2(crc, a)                         crc8_calc(crc, a, 0xD5)
  34 #define crc8_dvb_s2_update(crc, data, length)       crc8_update(crc, data, length, 0xD5)
  35 #define crc8_dvb_s2_sbuf_append(dst, start)         crc8_sbuf_append(dst, start, 0xD5)
  36 #define crc8_poly_0xba(crc, a)                      crc8_calc(crc, a, 0xBA)
  37 #define crc8_poly_0xba_sbuf_append(dst, start)      crc8_sbuf_append(dst, start, 0xBA)
  38
  39 uint8_t crc8_xor_update(uint8_t crc, const void *data, uint32_t length);
  40 void crc8_xor_sbuf_append(struct sbuf_s *dst, uint8_t *start);
  41
  42 #define FNV_PRIME           16777619
  43 #define FNV_OFFSET_BASIS    2166136261
  44
  45 uint32_t fnv_update(uint32_t hash, const void *data, uint32_t length);