
/*
 * rcvbuf.h
 * Copyright (C) 2001 by the University of Southern California
 * $Id: rcvbuf.h,v 1.2 2005/08/25 18:58:08 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.
 *
 */

/*
 * Pragmatic General Multicast (PGM), Reliable Multicast
 *
 * rcvbuf.h
 *
 * Class RcvBuffer: maintains information about what packets were received,
 * and keeps track of gaps in packet sequence number.
 *
 * Christos Papadopoulos
 */

#ifndef RCVBUF_H_
#define RCVBUF_H_
class Gap;

class RcvBuffer {
 public:
	RcvBuffer ();
	//	~RcvBuffer ();
	void	add_pkt (int, double);	// add packet with seq num n, received at time t
	int	exists_pkt (int);	// query the existence of packet n
	void	print ();
	int	nextpkt_;		// seq num of the next expected packet
	int	maxpkt_;		// packets received without gap
	int	pkts_recovered_;	// total number of recovered packets
	int	duplicates_;		// duplicate packets
	double	delay_sum_;		// total delay to recover lost packets
	double	max_delay_;		// max recovery delay
	double	min_delay_;		// min recovery delay

 protected:
	Gap	*gap_;
	Gap	*tail_;
};

//
// Class Gap: identifies a gap
// in packet reception sequence number
//
class Gap {
 public:
	int	start_;
	int	end_;
	double	time_;
	Gap	*next_;
};

#endif

