static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) {
     (*(pkeys+0)) = CRC32((*(pkeys+0)), c);
     (*(pkeys+1)) += (*(pkeys+0)) & 0xff;
     (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;
     {
        register int keyshift = (int)((*(pkeys+1)) >> 24);
        (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift);
     }
     return c;
}