ppp_fcs.h

this is a linux pptp software

/* ppp_fcs.h ... header file for PPP-HDLC FCS 
 *               C. Scott Ananian <[e-mail]>
 *
 * $Id: ppp_fcs.h,v 1.1.1.1 2000/12/23 08:19:51 scott Exp $
 */ 

#define PPPINITFCS16    0xffff  /* Initial FCS value */
#define PPPGOODFCS16    0xf0b8  /* Good final FCS value */

u_int16_t pppfcs16(u_int16_t fcs, void *cp, int len);