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//
// PLP - An implementation of the PSION link protocol
//
// Copyright (C) 1999 Philip Proudman
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// 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
//
// e-mail philip.proudman@btinternet.com
#include <stream.h>
#include <stdlib.h>
#include <stdio.h>
#include "defs.h"
#include "bool.h"
#include "link.h"
#include "packet.h"
#include "bufferstore.h"
#include "bufferarray.h"
link::link(const char *fname, int baud, IOWatch & iow, unsigned short _verbose)
{
p = new packet(fname, baud, iow);
verbose = _verbose;
idSent = 0;
idLastGot = -1;
newLink = true;
somethingToSend = false;
timesSent = 0;
failed = false;
}
link::~link()
{
delete p;
}
void link::
reset() {
idSent = 0;
idLastGot = -1;
newLink = true;
somethingToSend = false;
timesSent = 0;
failed = false;
}
short int link::
getVerbose()
{
return verbose;
}
void link::
setVerbose(short int _verbose)
{
verbose = _verbose;
}
short int link::
getPktVerbose()
{
return p->getVerbose();
}
void link::
setPktVerbose(short int _verbose)
{
p->setVerbose(_verbose);
}
void link::
send(const bufferStore & buff)
{
if (buff.getLen() > 300)
failed = true;
else
sendQueue.pushBuffer(buff);
}
bufferArray link::
poll()
{
bufferArray ret;
bufferStore buff;
unsigned char type;
while (p->get(type, buff)) {
int seq = type & 0x0f;
bufferStore blank;
type &= 0xf0;
switch (type) {
case 0x30:
if (verbose & LNK_DEBUG_LOG) {
cout << "link: << dat seq=" << seq ;
if (verbose & LNK_DEBUG_DUMP)
cout << " " << buff << endl;
else
cout << " len=" << buff.getLen() << endl;
}
// Send ack
if (idLastGot != seq) {
idLastGot = seq;
ret.pushBuffer(buff);
} else {
if (verbose & LNK_DEBUG_LOG)
cout << "link: DUP\n";
}
if (verbose & LNK_DEBUG_LOG)
cout << "link: >> ack seq=" << seq << endl;
blank.init();
p->send(seq, blank);
break;
case 0x00:
// Ack
if (seq == idSent) {
if (verbose & LNK_DEBUG_LOG) {
cout << "link: << ack seq=" << seq ;
if (verbose & LNK_DEBUG_DUMP)
cout << " " << buff;
cout << endl;
}
somethingToSend = false;
timesSent = 0;
}
break;
case 0x20:
// New link
if (verbose & LNK_DEBUG_LOG) {
cout << "link: << lrq seq=" << seq;
if (verbose & LNK_DEBUG_DUMP)
cout << " " << buff;
cout << endl;
}
idLastGot = 0;
if (verbose & LNK_DEBUG_LOG)
cout << "link: >> lack seq=" << seq << endl;
somethingToSend = false;
blank.init();
p->send(idLastGot, blank);
break;
case 0x10:
// Disconnect
if (verbose & LNK_DEBUG_LOG)
cout << "link: << DISC" << endl;
failed = true;
return ret;
}
}
if (p->linkFailed()) {
failed = true;
return ret;
}
if (!somethingToSend) {
countToResend = 0;
if (newLink) {
somethingToSend = true;
toSend.init();
newLink = false;
idSent = 0;
} else {
if (!sendQueue.empty()) {
somethingToSend = true;
toSend = sendQueue.popBuffer();
idSent++;
if (idSent > 7)
idSent = 0;
}
}
}
if (somethingToSend) {
if (countToResend == 0) {
timesSent++;
if (timesSent == 5) {
failed = true;
} else {
if (toSend.empty()) {
// Request for new link
if (verbose & LNK_DEBUG_LOG)
cout << "link: >> lrq seq=" << idSent << endl;
p->send(0x20 + idSent, toSend);
} else {
if (verbose & LNK_DEBUG_LOG) {
cout << "link: >> data seq=" << idSent;
if (verbose & LNK_DEBUG_DUMP)
cout << " " << toSend;
cout << endl;
}
p->send(0x30 + idSent, toSend);
}
countToResend = 5;
}
} else
countToResend--;
}
return ret;
}
bool link::
stuffToSend()
{
return (somethingToSend || !sendQueue.empty());
}
bool link::
hasFailed()
{
return failed;
}
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