typedef unsigned short WORD;
typedef unsigned char byte;


unsigned int get_crc_ccitt(unsigned int crc, unsigned int *buf, unsigned long size );
unsigned int get_crc_16(unsigned int crc,unsigned int *buf,unsigned long size );
unsigned int get_crc_16b(unsigned int crc,unsigned int *buf,unsigned long size );
int get_crc16(unsigned int *buf, int size );

unsigned int get_crc32(unsigned long *num);