src/include/crc_byte.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef CRC_BYTE_H
   4 #define CRC_BYTE_H
   5
   6 #include <stddef.h>
   7 #include <stdint.h>
   8
   9 /* This function is used to calculate crc7 byte by byte, with polynomial
  10  * x^7 + x^3 + 1.
  11  *
  12  * prev_crc: old crc result (0 for first)
  13  * data: new byte
  14  * return value: new crc result
  15  */
  16 uint8_t crc7_byte(uint8_t prev_crc, uint8_t data);
  17
  18 /* This function is used to calculate crc16 byte by byte, with polynomial
  19  * x^16 + x^12 + x^5 + 1.
  20  *
  21  * prev_crc: old crc result (0 for first)
  22  * data: new byte
  23  * return value: new crc result
  24  */
  25 uint16_t crc16_byte(uint16_t prev_crc, uint8_t data);
  26
  27 /* This function is used to calculate crc32 byte by byte, with polynomial
  28  * x^32 + x^26 +  x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 +
  29  * x^5 + x^4 + x^2 + x + 1
  30  *
  31  * prev_crc: old crc result (0 for first)
  32  * data: new byte
  33  * return value: new crc result
  34  */
  35 uint32_t crc32_byte(uint32_t prev_crc, uint8_t data);
  36
  37 #define CRC(buf, size, crc_func) ({ \
  38         const uint8_t *_crc_local_buf = (const uint8_t *)buf; \
  39         size_t _crc_local_size = size; \
  40         __typeof__(crc_func(0, 0)) _crc_local_result = 0; \
  41         while (_crc_local_size--) { \
  42                 _crc_local_result = crc_func(_crc_local_result, *_crc_local_buf++); \
  43         } \
  44         _crc_local_result; \
  45 })
  46
  47 #endif /* CRC_BYTE_H */