typedef unsigned char uchar;#define LOBYTE(x) ((uchar)((x) & 0xFF))#define HIBYTE(x) ((uchar)((x) >> 8))unsigned short icrc(unsigned short crc, unsigned char *bufptr,	unsigned long len, short jinit, int jrev){	unsigned short icrc1(unsigned short crc, unsigned char onech);	static unsigned short icrctb[256],init=0;	static uchar rchr[256];	unsigned short j,cword=crc;	static uchar it[16]={0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};	if (!init) {		init=1;		for (j=0;j<=255;j++) {			icrctb[j]=icrc1(j << 8,(uchar)0);			rchr[j]=(uchar)(it[j & 0xF] << 4 | it[j >> 4]);		}	}	if (jinit >= 0) cword=((uchar) jinit) | (((uchar) jinit) << 8);	else if (jrev < 0) cword=rchr[HIBYTE(cword)] | rchr[LOBYTE(cword)] << 8;	for (j=1;j<=len;j++)		cword=icrctb[(jrev < 0 ? rchr[bufptr[j]] :			bufptr[j]) ^ HIBYTE(cword)] ^ LOBYTE(cword) << 8;	return (jrev >= 0 ? cword : rchr[HIBYTE(cword)] | rchr[LOBYTE(cword)] << 8);}#undef LOBYTE#undef HIBYTE