/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef CRC_BYTE_H #define CRC_BYTE_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 */