/*
 *	    Written by Toshiharu OHNO (tony-o@iij.ad.jp)
 *
 *   Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the Internet Initiative Japan.  The name of the
 * IIJ may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * $Id:$
 *
 *	TODO:
 */

#ifndef _MBUF_H_
#define _MBUF_H_

struct mbuf {
  u_char *base;		/* pointer to top of buffer space */
  short size;		/* size allocated from base */
  short offset;		/* offset to start position */
  short cnt;		/* available byte count in buffer */
  short type;
  struct mbuf *next;	/* link to next mbuf */
  struct mbuf *pnext;	/* link to next packet */
};

struct mqueue {
  struct mbuf *top;
  struct mbuf *last;
  int qlen;
};

#define	NULLBUFF	((struct mbuf *)0)

#define MBUF_CTOP(bp)   (bp->base + bp->offset)

#define MB_ASYNC	1
#define MB_FSM		2
#define MB_HDLCOUT	3
#define MB_IPIN		4
#define MB_ECHO		5
#define MB_LQR		6
#define MB_MODEM	7
#define MB_VJCOMP	8
#define	MB_LOG		9
#define	MB_IPQ		10
#define	MB_MAX		MB_IPQ

extern int plength(struct mbuf *bp);
extern struct mbuf *mballoc(int cnt, int type);
extern struct mbuf *mbfree(struct mbuf *bp);
extern void pfree(struct mbuf *bp);
extern void mbwrite(struct mbuf *bp, u_char *ptr, int cnt);
extern struct mbuf *mbread(struct mbuf *bp, u_char *ptr, int cnt);
extern void DumpBp(struct mbuf *bp);
extern void Enqueue(struct mqueue *queue, struct mbuf *bp);
extern struct mbuf *Dequeue(struct mqueue *queue);
#endif