/*  File: crc.hh  */#ifndef __crc_hh__#define __crc_hh__// 16-Bit CRC checksum class:class Crc16 {  static const uint16 polynomial;  uint16 crc; public:  Crc16 (void){ crc = 0xFFFF; }  void add_bits(uint32 bitstring, uint32 length);  // feed a bitstring to the crc calculation (0 < length <= 32)  uint16 checksum (void){    // return the calculated checksum and erase it for next calls to add_bits()    register uint16 sum = crc;    crc = 0xFFFF;    return sum;  }};#endif