/* $Id: sbuf.h 30045 2010-06-04 20:38:56Z vboxsync $ */
/** @file
 * NAT - sbuf declarations/defines.
 */

/*
 * Copyright (C) 2006-2010 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

/*
 * This code is based on:
 *
 * Copyright (c) 1995 Danny Gasparovski.
 *
 * Please read the file COPYRIGHT for the
 * terms and conditions of the copyright.
 */

#ifndef _SBUF_H_
#define _SBUF_H_

#ifndef VBOX_WITH_SLIRP_BSD_SBUF
# define sbflush(sb) sbdrop((sb),(sb)->sb_cc)
# define sbspace(sb) ((sb)->sb_datalen - (sb)->sb_cc)
# define SBUF_LEN(sb) ((sb)->sb_cc)
# define SBUF_SIZE(sb) ((sb)->sb_datalen)


struct sbuf
{
    u_int   sb_cc;          /* actual chars in buffer */
    u_int   sb_datalen;     /* Length of data  */
    char    *sb_wptr;       /* write pointer. points to where the next
                             * bytes should be written in the sbuf */
    char    *sb_rptr;       /* read pointer. points to where the next
                             * byte should be read from the sbuf */
    char    *sb_data;       /* Actual data */
};

void sbfree (struct sbuf *);
void sbdrop (struct sbuf *, int);
void sbreserve (PNATState, struct sbuf *, int);
void sbappend (PNATState, struct socket *, struct mbuf *);
void sbappendsb (PNATState, struct sbuf *, struct mbuf *);
void sbcopy (struct sbuf *, int, int, char *);
#else
void sbappend (PNATState, struct socket *, struct mbuf *);
# include "bsd/sys/sbuf.h"
# define SBUF_LEN(sb) (sbuf_len(sb))
/* XXX: @todo SBUF_SIZE is a hack both space and SIZE shouldn't be used out of subr_sbuf.c*/
# define SBUF_SIZE(sb) ((sb)->s_size)
/* see subr_sbuf.c to verify the formula */
# define sbspace(sb) (SBUF_SIZE(sb) - SBUF_LEN((sb)) - 1)
#endif
#endif