From 4e39c824e07f192c35afa88dcceee863528dbd32 Mon Sep 17 00:00:00 2001 From: Xiang Wang Date: Tue, 5 Nov 2019 12:00:39 +0800 Subject: lib: add calculate crc byte by byte Change-Id: I5cab1f90452b08a464ad7a2d7e75d97187452992 Signed-off-by: Xiang Wang Reviewed-on: https://review.coreboot.org/c/coreboot/+/36624 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner Reviewed-by: Patrick Georgi --- src/include/crc_byte.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/include/crc_byte.h (limited to 'src/include') diff --git a/src/include/crc_byte.h b/src/include/crc_byte.h new file mode 100644 index 0000000000..9315277d23 --- /dev/null +++ b/src/include/crc_byte.h @@ -0,0 +1,40 @@ +/* + * 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 + +/* 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); + + +#endif /* CRC_BYTE_H */ -- cgit v1.2.3