unsigned short crc16 (const void *data, unsigned data_size)
{
 if (!data || !data_size)
 return 0;
 unsigned short crc = 0;
 unsigned char* buf = (unsigned char*)data;
 while (data_size--)
 crc = (crc >> 8) ^ crc16_table[(unsigned char)crc ^ *buf++];
 return crc;
}