| /* |
| * CRC16 (CCITT) Checksum Algorithm |
| * |
| * Copyright (c) 2021 Wind River Systems, Inc. |
| * |
| * Author: |
| * Bin Meng <bin.meng@windriver.com> |
| * |
| * From Linux kernel v5.10 include/linux/crc-ccitt.h |
| * |
| * SPDX-License-Identifier: GPL-2.0 |
| */ |
| |
| #ifndef CRC_CCITT_H |
| #define CRC_CCITT_H |
| |
| extern uint16_t const crc_ccitt_table[256]; |
| extern uint16_t const crc_ccitt_false_table[256]; |
| |
| extern uint16_t crc_ccitt(uint16_t crc, const uint8_t *buffer, size_t len); |
| extern uint16_t crc_ccitt_false(uint16_t crc, const uint8_t *buffer, size_t len); |
| |
| static inline uint16_t crc_ccitt_byte(uint16_t crc, const uint8_t c) |
| { |
| return (crc >> 8) ^ crc_ccitt_table[(crc ^ c) & 0xff]; |
| } |
| |
| static inline uint16_t crc_ccitt_false_byte(uint16_t crc, const uint8_t c) |
| { |
| return (crc << 8) ^ crc_ccitt_false_table[(crc >> 8) ^ c]; |
| } |
| |
| #endif /* CRC_CCITT_H */ |
