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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef CRC_BYTE_H
#define CRC_BYTE_H
#include <stddef.h>
#include <stdint.h>
/* This function is used to calculate crc7 byte by byte, with polynomial
* x^7 + x^3 + 1.
*
* prev_crc: old crc result (0 for first)
* data: new byte
* return value: new crc result
*/
uint8_t crc7_byte(uint8_t prev_crc, uint8_t data);
/* This function is used to calculate crc16 byte by byte, with polynomial
* x^16 + x^12 + x^5 + 1.
*
* prev_crc: old crc result (0 for first)
* data: new byte
* return value: new crc result
*/
uint16_t crc16_byte(uint16_t prev_crc, uint8_t data);
/* This function is used to calculate crc32 byte by byte, with polynomial
* x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 +
* x^5 + x^4 + x^2 + x + 1
*
* prev_crc: old crc result (0 for first)
* data: new byte
* return value: new crc result
*/
uint32_t crc32_byte(uint32_t prev_crc, uint8_t data);
#define CRC(buf, size, crc_func) ({ \
const uint8_t *_crc_local_buf = (const uint8_t *)buf; \
size_t _crc_local_size = size; \
__typeof__(crc_func(0, 0)) _crc_local_result = 0; \
while (_crc_local_size--) { \
_crc_local_result = crc_func(_crc_local_result, *_crc_local_buf++); \
} \
_crc_local_result; \
})
#endif /* CRC_BYTE_H */
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