settimestamp.cc

COPE the first practical network coding scheme which is developped on click

// -*- c-basic-offset: 4 -*-
/*
 * settimestamp.{cc,hh} -- set timestamp annotations
 * Douglas S. J. De Couto, Eddie Kohler
 * based on setperfcount.{cc,hh}
 *
 * Copyright (c) 1999-2000 Massachusetts Institute of Technology
 * Copyright (c) 2005 Regents of the University of California
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, subject to the conditions
 * listed in the Click LICENSE file. These conditions include: you must
 * preserve this copyright notice, and you cannot mention the copyright
 * holders in advertising related to the Software without their permission.
 * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
 * notice is a summary of the Click LICENSE file; the license in that file is
 * legally binding.
 */

#include <click/config.h>
#include "settimestamp.hh"
#include <click/confparse.hh>
#include <click/packet_anno.hh>
#include <click/error.hh>
CLICK_DECLS

SetTimestamp::SetTimestamp()
    : Element(1, 1)
{
}

SetTimestamp::~SetTimestamp()
{
}

int
SetTimestamp::configure(Vector<String> &conf, ErrorHandler *errh)
{
    bool first = false, delta = false;
    _tv._sec = -1;
    _action = ACT_NOW;
    if (cp_va_parse(conf, this, errh,
		    cpOptional,
		    cpTimestamp, "timestamp", &_tv,
		    cpKeywords,
		    "FIRST", cpBool, "set first timestamp?", &first,
		    "DELTA", cpBool, "set timestamp delta?", &delta,
		    cpEnd) < 0)
	return -1;
    if ((first && delta) || (_tv._sec >= 0 && delta))
	return errh->error("must specify at most one of 'FIRST' and 'DELTA'");
    _action = (delta ? ACT_DELTA : (_tv._sec < 0 ? ACT_NOW : ACT_TIME) + (first ? ACT_FIRST_NOW : ACT_NOW));
    return 0;
}

Packet *
SetTimestamp::simple_action(Packet *p)
{
    if (_action == ACT_NOW)
	p->timestamp_anno().set_now();
    else if (_action == ACT_TIME)
	p->timestamp_anno() = _tv;
    else if (_action == ACT_FIRST_NOW)
	FIRST_TIMESTAMP_ANNO(p).set_now();
    else if (_action == ACT_FIRST_TIME)
	FIRST_TIMESTAMP_ANNO(p) = _tv;
    else
	p->timestamp_anno() -= FIRST_TIMESTAMP_ANNO(p);
    return p;
}

CLICK_ENDDECLS
EXPORT_ELEMENT(SetTimestamp)