请教关于 c语言 crc16转换成python语言的实现

#include <stdio.h>
#include <string>

unsigned int Getcrc16(unsigned char *r_data,unsigned int length, unsigned char cInhi, unsigned char cInlo)

{

    unsigned char cl,ch;

    unsigned char savehi,savelo;

    int ii,flag;
    unsigned short CRC;
    unsigned char crc16hi;
    unsigned char crc16lo;
   

    crc16hi=cInhi;//0xFF;

    crc16lo=cInlo;//0xFF;

    cl=0x21;

    ch=0x10;

    for (ii=0;ii<length;ii++)

    {

        printf("%d=%c  ",ii,r_data[ii]);
        crc16lo=(crc16lo ^ r_data[ii]);

        for (flag=0;flag<8;flag++)

        {

            savehi=crc16hi;

            savelo=crc16lo;

            crc16hi=(crc16hi>>1);

            crc16lo=(crc16lo>>1);

            if ((savehi & 0x01)==0x01)

                crc16lo=(crc16lo | 0x80);

            if ((savelo & 0x01)==0x01)

            {

                crc16hi = (crc16hi ^ ch);

                crc16lo = (crc16lo ^ cl);

            }        

        }

    }
    CRC = (crc16hi)+(crc16lo<<8);
    //    over_turn(2, (unsigned char*)&CRC);
    return CRC;
}
len

int mylen(char *s)
{
    int i=0;
    while (s[i]!='\0')
    {
        i++;
    }
    return i+1;
}

int main()
{
   const char* s;
    unsigned int len=0;
    int i=0;
    unsigned int rt;
    unsigned char cInhi=0xFF;
    unsigned char cInlo=0xFF;
    unsigned char* sv;
       char* s2="BDBDBD9000000110010100000900003C000000900000018888888820130117104601000000000000000000000000000000008888888800000000000000000000000000000000000000000000";
    printf("aaaaaa\n");

    len=mylen(s2);
    //sv=new unsigned char[len-1] ;
   

    for(i=0;i<len-1;i++)
    {
        printf("my%d=%c  ",i,s2[i]);
        sv[i]=s2[i];
    }
    printf("\n==============\n");
    rt=Getcrc16(sv,len-1,cInhi,cInlo);
    printf("\n==============\n");
    printf("%d\n",&rt);
    gets(s2);
    return 0;
}

from struct import pack,unpack
def Getcrc16(s,length):
    print s,length
    savehi=''
    savelo=''
    ii=0
    flag=0
    CRC=''
    crc16hi=0xFF;
    crc16lo=0xFF;
    cl=0x21;
    ch=0x10;
    for ii in range(0,length):
        crc16lo=(crc16lo ^ int(s[ii] , 16))
        for flag in range(0,8):
            savehi=crc16hi;
            savelo=crc16lo;
            crc16hi=(crc16hi>>1);
            crc16lo=(crc16lo>>1);
            if ((savehi & 0x01)==0x01):
                                crc16lo=(crc16lo | 0x80);
            if ((savelo & 0x01)==0x01):
                                crc16hi = (crc16hi ^ ch);
                                crc16lo = (crc16lo ^ cl);
    CRC = (crc16hi)+(crc16lo<<8);
    return CRC;

def main():
    s2='BDBDBD9000000110010100000900003C000000900000018888888820130117104601000000000000000000000000000000008888888800000000000000000000000000000000000000000000'
    s=Getcrc16(s2,len(s2))
    print s,repr(pack('>H',s))


if __name__ == "__main__":
    main()