/*
 * Decapsulator.cc
 * Copyright (C) 2000 by the University of Southern California
 * $Id: Decapsulator.cc,v 1.4 2005/08/25 18:58:02 johnh Exp $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 *
 * The copyright of this module includes the following
 * linking-with-specific-other-licenses addition:
 *
 * In addition, as a special exception, the copyright holders of
 * this module give you permission to combine (via static or
 * dynamic linking) this module with free software programs or
 * libraries that are released under the GNU LGPL and with code
 * included in the standard release of ns-2 under the Apache 2.0
 * license or under otherwise-compatible licenses with advertising
 * requirements (or modified versions of such code, with unchanged
 * license).  You may copy and distribute such a system following the
 * terms of the GNU GPL for this module and the licenses of the
 * other code concerned, provided that you include the source code of
 * that other code when and as the GNU GPL requires distribution of
 * source code.
 *
 * Note that people who make modified versions of this module
 * are not obligated to grant this special exception for their
 * modified versions; it is their choice whether to do so.  The GNU
 * General Public License gives permission to release a modified
 * version without this exception; this exception also makes it
 * possible to release a modified version which carries forward this
 * exception.
 *
 */
//
// $Header: /nfs/jade/vint/CVSROOT/ns-2/common/Decapsulator.cc,v 1.4 2005/08/25 18:58:02 johnh Exp $

#include "Decapsulator.h"
#include "ip.h"
#include "packet.h"
#include "encap.h"

static class DecapsulatorClass : public TclClass {
public:
	DecapsulatorClass() : TclClass("Agent/Decapsulator") {}
	TclObject* create(int, const char*const*) {
		return (new Decapsulator());
	}
} class_decapsulator;

Decapsulator::Decapsulator()  : Agent(PT_ENCAPSULATED)
{ 
}

Packet* const Decapsulator::decapPacket(Packet* const p) 
{
	hdr_cmn* ch= hdr_cmn::access(p);
	if (ch->ptype() == PT_ENCAPSULATED) {
		hdr_encap* eh= hdr_encap::access(p);
		return eh->decap();
	}
	return 0;
}
void Decapsulator::recv(Packet* p, Handler* h)
{
        Packet *decap_p= decapPacket(p);
	if (decap_p) {
		send(decap_p, h);
		Packet::free(p);
		return;
	}
	send(p, h);
}