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CONNECT.CPP
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/*
** Command & Conquer(tm)
** Copyright 2025 Electronic Arts Inc.
**
** 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* $Header: F:\projects\c&c\vcs\code\connect.cpv 1.9 16 Oct 1995 16:48:56 JOE_BOSTIC $ */
/***************************************************************************
** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
***************************************************************************
* *
* Project Name : Command & Conquer *
* *
* File Name : CONNECT.CPP *
* *
* Programmer : Bill Randolph *
* *
* Start Date : December 20, 1994 *
* *
* Last Update : May 31, 1995 [BRR] *
*-------------------------------------------------------------------------*
* Functions: *
* ConnectionClass::ConnectionClass -- class constructor *
* ConnectionClass::~ConnectionClass -- class destructor *
* ConnectionClass::Service -- main polling routine; services packets *
* ConnectionClass::Time -- gets current time *
* ConnectionClass::Command_Name -- returns name for a packet command *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "function.h"
#ifdef WWLIB32_H
#else
#include <sys\timeb.h>
#endif
/*
********************************* Globals ***********************************
*/
static char *ConnectionClass::Commands[PACKET_COUNT] = {
"ADATA",
"NDATA",
"ACK"
};
/***************************************************************************
* ConnectionClass::ConnectionClass -- class constructor *
* *
* If either max_retries or timeout is -1, that parameter is ignored in *
* timeout computations. If both are -1, the connection will just keep *
* retrying forever. *
* *
* INPUT: *
* numsend desired # of entries for the send queue *
* numreceive desired # of entries for the recieve queue *
* maxlen max length of an application packet *
* magicnum the packet "magic number" for this connection *
* retry_delta the time to wait between sends *
* max_retries the max # of retries allowed for a packet *
* (-1 means retry forever, based on this parameter) *
* timeout the max amount of time before we give up on a packet *
* (-1 means retry forever, based on this parameter) *
* *
* OUTPUT: *
* none. *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 12/20/1994 BR : Created. *
*=========================================================================*/
ConnectionClass::ConnectionClass (int maxlen, unsigned short magicnum,
unsigned long retry_delta, unsigned long max_retries, unsigned long timeout)
{
/*------------------------------------------------------------------------
Compute our maximum packet length
------------------------------------------------------------------------*/
MaxPacketLen = maxlen + sizeof(CommHeaderType);
/*------------------------------------------------------------------------
Assign the magic number
------------------------------------------------------------------------*/
MagicNum = magicnum;
/*------------------------------------------------------------------------
Initialize the retry time. This is the time that t2 - t1 must be greater
than before a retry will occur.
------------------------------------------------------------------------*/
RetryDelta = retry_delta;
/*------------------------------------------------------------------------
Set the maximum allowable retries.
------------------------------------------------------------------------*/
MaxRetries = max_retries;
/*------------------------------------------------------------------------
Set the timeout for this connection.
------------------------------------------------------------------------*/
Timeout = timeout;
/*------------------------------------------------------------------------
Allocate the packet staging buffer. This will be used to
------------------------------------------------------------------------*/
PacketBuf = new char[ MaxPacketLen ];
} /* end of ConnectionClass */
/***************************************************************************
* ConnectionClass::~ConnectionClass -- class destructor *
* *
* INPUT: *
* none. *
* *
* OUTPUT: *
* none. *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 12/20/1994 BR : Created. *
*=========================================================================*/
ConnectionClass::~ConnectionClass ()
{
/*------------------------------------------------------------------------
Free memory.
------------------------------------------------------------------------*/
delete [] PacketBuf;
} /* end of ~ConnectionClass */
/***************************************************************************
* ConnectionClass::Service -- main polling routine; services packets *
* *
* INPUT: *
* none. *
* *
* OUTPUT: *
* 1 = OK, 0 = error (connection is broken!) *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 12/20/1994 BR : Created. *
*=========================================================================*/
int ConnectionClass::Service (void)
{
/*------------------------------------------------------------------------
Service the Send Queue. This [re]sends packets in the Send Queue which
haven't been ACK'd yet, and if their retry timeout has expired, and
updates the FirstTime, LastTime & SendCount values in the Queue entry.
Entries that have been ACK'd should be removed.
------------------------------------------------------------------------*/
// if (!Service_Send_Queue())
// return(0);
/*------------------------------------------------------------------------
Service the Receive Queue. This sends ACKs for packets that haven't
been ACK'd yet. Entries that the app has read, and have been ACK'd,
should be removed.
------------------------------------------------------------------------*/
// if (!Service_Receive_Queue())
// return(0);
// return(1);
if ( Service_Send_Queue() && Service_Receive_Queue() ) {
return(1);
} else {
return(0);
}
} /* end of Service */
/***************************************************************************
* ConnectionClass::Time -- gets current time *
* *
* INPUT: *
* *
* OUTPUT: *
* none. *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 12/20/1994 BR : Created. *
*=========================================================================*/
unsigned long ConnectionClass::Time (void)
{
#ifdef WWLIB32_H
return(TickCount.Time()); // Westwood Library time
#else
static struct timeb mytime; // DOS time
unsigned long msec;
ftime(&mytime);
msec = (unsigned long)mytime.time * 1000L + (unsigned long)mytime.millitm;
return((msec / 100) * 6);
#endif
} /* end of Time */
/***************************************************************************
* ConnectionClass::Command_Name -- returns name for given packet command *
* *
* INPUT: *
* command packet Command value to get name for *
* *
* OUTPUT: *
* ptr to command name, NULL if invalid *
* *
* WARNINGS: *
* none. *
* *
* HISTORY: *
* 05/31/1995 BRR : Created. *
*=========================================================================*/
char *ConnectionClass::Command_Name(int command)
{
if (command >= 0 && command < PACKET_COUNT) {
return(Commands[command]);
} else {
return(NULL);
}
}