/*******************************************************************************
Copyright (C), 2010-2012,SMT.
FileName:crc16.h
Author: 施锦峰
Date: 2012-3-26
Description: CRC16校验相关的接口实现
History:
* <author> <date> <desc>
* 施锦峰 2012-3-26 新建
*******************************************************************************/
#include<string.h>
#include "crc16.h"
#include "const.h"
#define LTBS(X) ((((UINT16)(X) & 0xff00) >> 8) | (((UINT16)(X) & 0x00ff) <<8 ))
const UINT16 gCRCTable[256] = { 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, 0x8108, 0x9129,
0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, 0x9339,
0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695,
0x46B4, 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861,
0x2802, 0x3823, 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71,
0x0A50, 0x3A33, 0x2A12, 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5,
0x2C22, 0x3C03, 0x0C60, 0x1C41, 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, 0x7E97, 0x6EB6, 0x5ED5,
0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, 0x9188, 0x81A9,
0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83B9,
0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424,
0x4405, 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676,
0x4615, 0x5634, 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0,
0x08E1, 0x3882, 0x28A3, 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, 0x4A75, 0x5A54, 0x6A37, 0x7A16,
0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, 0x7C26, 0x6C07, 0x5C64,
0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, 0x6E17, 0x7E36,
0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 };
/*********************************************************************
Function: GetCRC16
Description: 获得CRC16校验数据
Input: data:待校验数据、len:数据长度
Output: 无
Return: ERROR:函数异常结束;CRC校验数据
Author: 施锦峰
Date: 2012-3-26
Others:
*********************************************************************/
INT32 GetCRC16(const UINT8 data[], UINT32 len)
{
UINT16 crc16 = 0;
UINT16 mid_buf = 0;
if (NULL == data)
{
return ERROR;
}
while (len > 0)
{
mid_buf = ((crc16 >> 8) ^ (*data)) & 0xff;
crc16 = gCRCTable[mid_buf] ^ (crc16 << 8);
data++;
len--;
}
return crc16 ^ 0xFFFF;
}
/*********************************************************************
Function: CheckCRC16
Description: CRC16校验
Input: check_data:待校验数据;check_len:待校验数据长度;crc_data:报文中CRC字段数据;crc_len:报文中CRC字段数据长度
Output: 无
Return: ERROR:校验失败;OK:函数正常结束
Author: 施锦峰
Date: 2012-3-26
Others:
*********************************************************************/
INT32 CheckCRC16(const UINT8 *check_data, UINT16 check_len, const UINT8 *crc_data, UINT16 crc_len)
{
INT32 ret = 0;
UINT16 cal_crcdata = 0;/*计算得到的CRC数据*/
UINT16 msg_crcdata = 0;/*报文中的CRC数据*/
if ((NULL == check_data) || (NULL == crc_data))
{
return ERROR;
}
/*CRC16 校验*/
ret = GetCRC16(check_data, check_len);
if (ERROR == ret)
{
return ERROR;
}
cal_crcdata = (UINT16) ret;
memcpy(&msg_crcdata, crc_data, crc_len);
msg_crcdata = LTBS(msg_crcdata);
if (cal_crcdata != msg_crcdata)
{
return ERROR;
}
return OK;
}
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