#ifndef _NRS_H
#define _NRS_H
  
#ifndef _GLOBAL_H
#include "global.h"
#endif
  
#ifndef _MBUF_H
#include "mbuf.h"
#endif
  
#ifndef _IFACE_H
#include "iface.h"
#endif
  
#define NRS_MAX 5       /* Maximum number of Nrs channels */
  
/* SLIP definitions */
#define NRS_ALLOC   40  /* Receiver allocation increment */
  
/*#define STX 0x02        /* frame start */
#define STX       2
#define ETX 0x03        /* frame end */
#define DLE 0x10        /* data link escape */
#define NUL 0x0         /* null character */
  
/* packet unstuffing state machine */
#define NRS_INTER   0       /* in between packets */
#define NRS_INPACK  1       /* we've seen STX, and are in a the packet */
#define NRS_ESCAPE  2       /* we've seen a DLE while in NRS_INPACK */
#define NRS_CSUM    3       /* we've seen an ETX, and are waiting for the checksum */
  
/* net/rom serial protocol control structure */
struct nrs {
    char state;     /* Receiver State control flag */
    unsigned char csum; /* Accumulating checksum */
    struct mbuf *rbp;   /* Head of mbuf chain being filled */
    struct mbuf *rbp1;  /* Pointer to mbuf currently being written */
    char *rcp;      /* Write pointer */
    int16 rcnt;     /* Length of mbuf chain */
    struct mbuf *tbp;   /* Transmit mbuf being sent */
    long errors;        /* Checksum errors detected */
    long packets ;      /* Number of packets received successfully */
    struct iface *iface ;   /* Associated interface structure */
    int (*send) __ARGS((int,struct mbuf *));/* Routine to send mbufs */
    int (*get) __ARGS((int));/* Routine to fetch input chars */
};
  
extern struct nrs Nrs[];
/* In nrs.c: */
int nrs_raw __ARGS((struct iface *iface,struct mbuf *bp));
void nrs_recv __ARGS((int dev,void *v1,void *v2));
  
#endif  /* _NRS_H */
