/*      $NetBSD: packet.c,v 1.2 2009/05/02 20:07:51 plunky Exp $        */

/*-
* Copyright (c) 2008 Iain Hibbert
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: packet.c,v 1.2 2009/05/02 20:07:51 plunky Exp $");

#include "btpand.h"

packet_t *
packet_alloc(channel_t *chan)
{
       packet_t *pkt;

       pkt = malloc(sizeof(packet_t) + chan->mru);
       if (pkt == NULL) {
               log_err("%s() failed: %m", __func__);
               return NULL;
       }

       memset(pkt, 0, sizeof(packet_t));
       STAILQ_INIT(&pkt->extlist);
       pkt->ptr = pkt->buf;

       pkt->chan = chan;
       chan->refcnt++;

       return pkt;
}

void
packet_free(packet_t *pkt)
{
       exthdr_t *eh;

       if (pkt->refcnt-- > 0)
               return;

       while ((eh = STAILQ_FIRST(&pkt->extlist)) != NULL) {
               STAILQ_REMOVE_HEAD(&pkt->extlist, next);
               free(eh);
       }

       pkt->chan->refcnt--;
       if (pkt->chan->refcnt == 0)
               channel_free(pkt->chan);

       free(pkt);
}

void
packet_adj(packet_t *pkt, size_t size)
{

       assert(pkt->refcnt == 0);
       assert(pkt->len >= size);

       pkt->ptr += size;
       pkt->len -= size;
}

pkthdr_t *
pkthdr_alloc(packet_t *pkt)
{
       pkthdr_t *ph;

       ph = malloc(sizeof(pkthdr_t));
       if (ph == NULL) {
               log_err("%s() failed: %m", __func__);
               return NULL;
       }

       ph->data = pkt;
       pkt->refcnt++;

       return ph;
}

void
pkthdr_free(pkthdr_t *ph)
{

       packet_free(ph->data);
       free(ph);
}