crc16

最新推荐文章于 2024-05-31 00:12:45 发布

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最新推荐文章于 2024-05-31 00:12:45 发布

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分类专栏：算法设计文章标签： include c

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#include <cstdio>

using namespace std;

// x^16+x^12+x^5+1
unsigned short crc16(unsigned char *ptr, int len)
{
    unsigned short CRC = 0xFFFF; // vc++ sizeof(unsigned short) == 2
    unsigned char j, tmp = 0;
    int i;
    for (i = 0; i < len; i++)
    {    
        CRC ^= ptr[i];                     
        for (j = 0; j < 8; j++)                   
        {                                   
            tmp = CRC & 0x01;             
            CRC = CRC >> 1;                 
            if (tmp)
				CRC ^= 0xA001;    
        }                                   
    }
    return ((CRC >> 8) + (CRC << 8)) & 0xffff;
}

int main(int argc, char* argv[])
{
	unsigned char ptr[] = {0x01, 0x03, 0x0c, 0x43, 0x66, 0xcd, 0xc8, 0x40, 0x82, 0xdd, 0x6e, 0x44, 0x6b,0xf8, 0x45};
	int len = sizeof(ptr);
	printf("len=%d\n",len);
	printf("crc = %x", crc16(ptr,len));
	return 0;
}