| /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| * Very simple 8-bit CRC function. |
| */ |
| #ifndef __CROS_EC_CRC8_H |
| #define __CROS_EC_CRC8_H |
| |
| /** |
| * crc8 |
| * Return CRC-8 of the data, using x^8 + x^2 + x + 1 polynomial. A table-based |
| * algorithm would be faster, but for only a few bytes it isn't worth the code |
| * size. |
| * @param data uint8_t *, input, a pointer to input data |
| * @param len int, input, size of input data in bytes |
| * @return the crc-8 of the input data. |
| */ |
| uint8_t crc8(const uint8_t *data, int len); |
| |
| /** |
| * crc8_arg |
| * Return CRC-8 of the data, based upon pre-calculated partial CRC of previous |
| * data. |
| * @param data uint8_t *, input, a pointer to input data |
| * @param len int, input, size of input data in bytes |
| * @param previous_crc uint8_t, input, pre-calculated CRC of previous data. |
| * Seed with zero for a new calculation (or use the result of crc8()). |
| * @return the crc-8 of the input data. |
| */ |
| uint8_t crc8_arg(const uint8_t *data, int len, uint8_t previous_crc); |
| |
| #endif /* __CROS_EC_CRC8_H */ |
