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https://github.com/electronicarts/CnC_Renegade.git
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Initial commit of Command & Conquer Renegade source code.
This commit is contained in:
LFeenanEA
234
Code/Commando/natsock.h
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234
Code/Commando/natsock.h
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/*
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** Command & Conquer Renegade(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/***********************************************************************************************
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*** 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 ***
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***********************************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* $Archive:: /Commando/Code/Commando/natsock.h $*
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* *
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* $Author:: Steve_t $*
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* *
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* $Modtime:: 9/17/01 4:09p $*
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* *
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* $Revision:: 2 $*
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#pragma once
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#ifndef NATSOCK_H
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#define NATSOCK_H
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#include "always.h"
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#include "assert.h"
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#include "vector.h"
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#include <winsock.h>
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#ifndef DebugString
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#include "wwdebug.h"
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#ifdef WWDEBUG_SAY
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#define DebugString WWDEBUG_SAY
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#endif
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#endif
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#ifdef WWASSERT
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#ifndef fw_assert
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#define fw_assert WWASSERT
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#endif //fw_assert
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#else //WWASSERT
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#define fw_assert assert
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#endif //WWASSERT
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#ifdef errno
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#undef errno
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#endif //errno
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#define errno (WSAGetLastError())
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#define LAST_ERROR errno
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#define TIMER_SECOND 1000
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/*
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** Length of winsocks internal buffer.
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*/
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#define SOCKET_BUFFER_SIZE 1024*512
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/*
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** Length of our temporary receive buffer. Needs to be more that the max packet size which is about 550 bytes.
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*/
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#define RECEIVE_BUFFER_LEN 640
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/*
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** Number of statically allocated packet buffers for the class
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*/
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#define MAX_STATIC_BUFFERS 32
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//#define PACKET_LOSS_PERCENTAGE 15
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/*
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** Class to manage low level comms for talking to Mangler Servers.
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**
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** Can't use the Renegade packet comms since the packet format is different - Mangler servers expect C&C packet format.
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*/
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class SocketHandlerClass
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{
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public:
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/*
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** Constructor, destructor.
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*/
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SocketHandlerClass(void);
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~SocketHandlerClass(void);
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/*
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** Startup, shutdown.
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*/
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bool Open(int inport, int outport);
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void Close(void);
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void Discard_In_Buffers(void);
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void Discard_Out_Buffers(void);
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/*
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** Read, write.
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*/
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int Peek(void *buffer, int buffer_len, void *address, unsigned short *port, int packetnum = 0);
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int Read(void *buffer, int buffer_len, void *address, unsigned short *port, int packetnum = 0);
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void Write(void *buffer, int buffer_len, void *address, unsigned short port = 0);
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/*
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** Service.
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*/
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void Service(void);
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static void Service_All(void);
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inline void Service_Never(void) {CanService = false;};
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/*
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** Error handling.
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*/
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void Clear_Socket_Error(void);
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/*
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** Query functions.
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*/
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int Get_Num_Queued_Receive_Packets(void) {return(InBuffers.Count());};
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int Get_Num_Queued_Outgoing_Packets(void) {return(OutBuffers.Count());};
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int Get_Num_Local_Addresses(void) {return (LocalAddresses.Count());};
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unsigned char * Get_Local_Address (int a) {return (LocalAddresses[a]);};
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int Get_Incoming_Port(void) {return(IncomingPort);};
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SOCKET Get_Socket(void) {return(Socket);};
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private:
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/*
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** The socket associated with this class.
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*/
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SOCKET Socket;
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/*
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** The port that this class listens on.
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*/
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int IncomingPort;
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/*
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** The port that the class writes to.
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*/
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int OutgoingPort;
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/*
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** List of local addresses.
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*/
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DynamicVectorClass <unsigned char *> LocalAddresses;
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/*
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** This struct contains the information needed for each incoming and outgoing packet.
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** It acts as a temporary control for these packets.
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*/
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struct WinsockBufferType {
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unsigned char Address[4]; // Address. IN_ADDR
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int BufferLen; // Length of data in buffer
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bool IsBroadcast; // Flag to broadcast this packet
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bool InUse; // Useage state of buffer
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bool IsAllocated; // false means statically allocated.
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unsigned short Port; // Override port. Send to this port if not 0. Save incoming port number.
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unsigned long CRC; // CRC of packet for extra sanity.
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unsigned char Buffer[RECEIVE_BUFFER_LEN]; // Buffer to store packet in.
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};
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/*
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** Packet buffer allocation.
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*/
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void *Get_New_Out_Buffer(void);
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void *Get_New_In_Buffer(void);
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/*
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** Packet CRCs.
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*/
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void Add_CRC(unsigned long *crc, unsigned long val);
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virtual void Build_Packet_CRC(WinsockBufferType *packet);
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virtual bool Passes_CRC_Check(WinsockBufferType *packet);
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/*
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** Array of buffers to temporarily store incoming and outgoing packets.
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*/
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DynamicVectorClass<WinsockBufferType*> InBuffers;
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DynamicVectorClass<WinsockBufferType*> OutBuffers;
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/*
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** Array of buffers that are always available for incoming packets.
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*/
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WinsockBufferType StaticInBuffers[MAX_STATIC_BUFFERS];
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WinsockBufferType StaticOutBuffers[MAX_STATIC_BUFFERS];
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/*
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** Pointers to allow circular use of the buffer arrays.
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*/
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int InBufferArrayPos;
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int OutBufferArrayPos;
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/*
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** Usage count for each array.
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*/
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int InBuffersUsed;
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int OutBuffersUsed;
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/*
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** Temporary receive buffer to use when querying Winsock for incoming packets.
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*/
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unsigned char ReceiveBuffer[RECEIVE_BUFFER_LEN];
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/*
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** All instances of this class.
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*/
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static DynamicVectorClass<SocketHandlerClass*> AllSocketHandlers;
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/*
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** Can the regular service code be called for this class?
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*/
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bool CanService;
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};
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#endif //NATSOCK_H
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