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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 1997 Regents of the University of California.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Daedalus Research
* Group at the University of California Berkeley.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* Contributed by the Daedalus Research Group, UC Berkeley
* (http://daedalus.cs.berkeley.edu)
*
* Multi-state error model patches contributed by Jianping Pan
* (jpan@bbcr.uwaterloo.ca).
*
* @(#) $Header: /cvsroot/nsnam/ns-2/queue/fec.cc,v 1.1 2001/03/07 18:30:02 jahn Exp $ (UCB)
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/queue/fec.cc,v 1.1 2001/03/07 18:30:02 jahn Exp $ (UCB)";
#endif
#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include "packet.h"
#include "flags.h"
#include "mcast_ctrl.h"
#include "fec.h"
#include "srm-headers.h" // to get the hdr_srm structure
#include "classifier.h"
static class FECModelClass : public TclClass {
public:
FECModelClass() : TclClass("FECModel") {}
TclObject* create(int, const char*const*) {
return (new FECModel);
}
} class_fecmodel;
FECModel::FECModel() : firstTime_(1), FECstrength_(1)
{
}
int FECModel::command(int argc, const char*const* argv)
{
Tcl& tcl = Tcl::instance();
if (argc == 3) {
if (strcmp(argv[1], "FECstrength") == 0) {
FECstrength_ = atoi(argv[2]);
return (TCL_OK);
}
} else if (argc == 2) {
if (strcmp(argv[1], "FECstrength") == 0) {
tcl.resultf("%d", FECstrength_);
return (TCL_OK);
}
}
return BiConnector::command(argc, argv);
}
int fix_ = 0;
void FECModel::recv(Packet* p, Handler* h)
{
hdr_cmn* ch = hdr_cmn::access(p);
if(ch->direction() == hdr_cmn::DOWN) {
addfec(p);
downtarget_->recv(p, h);
return;
} else {
if(ch->errbitcnt() > FECstrength_) {
Packet::free(p);
return;
} else if (ch->errbitcnt() && (ch->errbitcnt() <= FECstrength_)) {
ch->errbitcnt() = 0;
ch->error() = 0;
printf("FEC: %d fixed\n", fix_++);
}
subfec(p);
uptarget_->recv(p, h);
}
}
void FECModel::addfec(Packet* p)
{
int bit = hdr_cmn::access(p)->size() * 8;
FECbyte_ = (int)(log(bit) / log(2));
FECbyte_ *= FECstrength_;
FECbyte_ = (FECbyte_ + 7) / 8;
// firstTime_ = 0;
// printf("FEC Down = %d \n", hdr_cmn::access(p)->size());
hdr_cmn::access(p)->size() += FECbyte_;
hdr_cmn::access(p)->fecsize() = FECbyte_;
}
void FECModel::subfec(Packet* p)
{
FECbyte_ = hdr_cmn::access(p)->fecsize();
hdr_cmn::access(p)->size() -= FECbyte_;
// printf("FEC Up = %d \n", hdr_cmn::access(p)->size());
}
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