| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2019 HardenedLinux |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #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 */ |