icrc.c

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unsigned short icrc1(unsigned short crc, unsigned char onech)
{
    int i;
    unsigned short ans=(crc^onech << 8);
    
    for (i=0;i<8;i++) {
        if (ans & 0x8000)
            ans = (ans <<= 1) ^ 4129;
        else
            ans <<= 1;
    }
    return ans;
}