1 /*
2 * Copyright (c) 2021 Bestechnic (Shanghai) Co., Ltd. All rights reserved.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #ifndef __CRC16_H
16 #define __CRC16_H
17
18 extern unsigned short const crc16_table[256];
19
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23
24 unsigned short _crc16(unsigned short crc, const unsigned char *buffer, unsigned int len);
25 int crc16ccitt(int crc, unsigned char * bytes, int start, int len);
26 #ifdef __cplusplus
27 }
28 #endif
29
crc16_byte(unsigned short crc,const unsigned char data)30 static inline unsigned short crc16_byte(unsigned short crc, const unsigned char data)
31 {
32 return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
33 }
34
35 #endif /* __CRC16_H */
36