CCITT标准CRC16 C++版 用于交通部 808协议,809协议生成校验码

 

没什么好讲的.直接贴上代码:

 1 #include "StdAfx.h"
 2 #include "CRC16_CCITT.h"
 3 
 4 /*
 5    CRC-16
 6 
 7    16 bit, non-reflected CRC using the polynomial 0x1021
 8    and the initial and final xor values shown below.
 9    in other words, the CCITT standard CRC-16
10 */
11 
12 #define CRC16_INIT_VALUE    0xffff
13 #define CRC16_XOR_VALUE        0x0000
14 
15 static const unsigned short crctable[256] = {
16     0x0000,    0x1021,    0x2042,    0x3063,    0x4084,    0x50a5,    0x60c6,    0x70e7,
17     0x8108,    0x9129,    0xa14a,    0xb16b,    0xc18c,    0xd1ad,    0xe1ce,    0xf1ef,
18     0x1231,    0x0210,    0x3273,    0x2252,    0x52b5,    0x4294,    0x72f7,    0x62d6,
19     0x9339,    0x8318,    0xb37b,    0xa35a,    0xd3bd,    0xc39c,    0xf3ff,    0xe3de,
20     0x2462,    0x3443,    0x0420,    0x1401,    0x64e6,    0x74c7,    0x44a4,    0x5485,
21     0xa56a,    0xb54b,    0x8528,    0x9509,    0xe5ee,    0xf5cf,    0xc5ac,    0xd58d,
22     0x3653,    0x2672,    0x1611,    0x0630,    0x76d7,    0x66f6,    0x5695,    0x46b4,
23     0xb75b,    0xa77a,    0x9719,    0x8738,    0xf7df,    0xe7fe,    0xd79d,    0xc7bc,
24     0x48c4,    0x58e5,    0x6886,    0x78a7,    0x0840,    0x1861,    0x2802,    0x3823,
25     0xc9cc,    0xd9ed,    0xe98e,    0xf9af,    0x8948,    0x9969,    0xa90a,    0xb92b,
26     0x5af5,    0x4ad4,    0x7ab7,    0x6a96,    0x1a71,    0x0a50,    0x3a33,    0x2a12,
27     0xdbfd,    0xcbdc,    0xfbbf,    0xeb9e,    0x9b79,    0x8b58,    0xbb3b,    0xab1a,
28     0x6ca6,    0x7c87,    0x4ce4,    0x5cc5,    0x2c22,    0x3c03,    0x0c60,    0x1c41,
29     0xedae,    0xfd8f,    0xcdec,    0xddcd,    0xad2a,    0xbd0b,    0x8d68,    0x9d49,
30     0x7e97,    0x6eb6,    0x5ed5,    0x4ef4,    0x3e13,    0x2e32,    0x1e51,    0x0e70,
31     0xff9f,    0xefbe,    0xdfdd,    0xcffc,    0xbf1b,    0xaf3a,    0x9f59,    0x8f78,
32     0x9188,    0x81a9,    0xb1ca,    0xa1eb,    0xd10c,    0xc12d,    0xf14e,    0xe16f,
33     0x1080,    0x00a1,    0x30c2,    0x20e3,    0x5004,    0x4025,    0x7046,    0x6067,
34     0x83b9,    0x9398,    0xa3fb,    0xb3da,    0xc33d,    0xd31c,    0xe37f,    0xf35e,
35     0x02b1,    0x1290,    0x22f3,    0x32d2,    0x4235,    0x5214,    0x6277,    0x7256,
36     0xb5ea,    0xa5cb,    0x95a8,    0x8589,    0xf56e,    0xe54f,    0xd52c,    0xc50d,
37     0x34e2,    0x24c3,    0x14a0,    0x0481,    0x7466,    0x6447,    0x5424,    0x4405,
38     0xa7db,    0xb7fa,    0x8799,    0x97b8,    0xe75f,    0xf77e,    0xc71d,    0xd73c,
39     0x26d3,    0x36f2,    0x0691,    0x16b0,    0x6657,    0x7676,    0x4615,    0x5634,
40     0xd94c,    0xc96d,    0xf90e,    0xe92f,    0x99c8,    0x89e9,    0xb98a,    0xa9ab,
41     0x5844,    0x4865,    0x7806,    0x6827,    0x18c0,    0x08e1,    0x3882,    0x28a3,
42     0xcb7d,    0xdb5c,    0xeb3f,    0xfb1e,    0x8bf9,    0x9bd8,    0xabbb,    0xbb9a,
43     0x4a75,    0x5a54,    0x6a37,    0x7a16,    0x0af1,    0x1ad0,    0x2ab3,    0x3a92,
44     0xfd2e,    0xed0f,    0xdd6c,    0xcd4d,    0xbdaa,    0xad8b,    0x9de8,    0x8dc9,
45     0x7c26,    0x6c07,    0x5c64,    0x4c45,    0x3ca2,    0x2c83,    0x1ce0,    0x0cc1,
46     0xef1f,    0xff3e,    0xcf5d,    0xdf7c,    0xaf9b,    0xbfba,    0x8fd9,    0x9ff8,
47     0x6e17,    0x7e36,    0x4e55,    0x5e74,    0x2e93,    0x3eb2,    0x0ed1,    0x1ef0
48 };
49 
50 USHORT GetCrc16_CCITT(LPBYTE pData, int nLength)
51 {
52     unsigned short crc = CRC16_INIT_VALUE;
53     for(int i=0; i<nLength; i++)
54     {
55         crc = (crc << 8) ^ crctable[(crc >> 8) ^ pData[i]];
56     }
57     crc ^= CRC16_XOR_VALUE;
58     return crc;
59 }

 

posted on 2016-07-14 18:05  Sam.Richard  阅读(633)  评论(0)    收藏  举报

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