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networksystem/networksystem.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#ifndef NETWORKSYSTEM_H
+#define NETWORKSYSTEM_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "networksystem/inetworksystem.h"
+#include "tier1/utlvector.h"
+#include "tier1/bitbuf.h"
+#include "sm_protocol.h"
+#include "networksystem/inetworkmessage.h"
+#include "tier1/netadr.h"
+#include "tier1/utlstring.h"
+#include "tier2/tier2.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class CNetworkServer;
+class CNetworkClient;
+class IConnectionlessPacketHandler;
+class CNetChannel;
+enum SystemNetworkMessageType_t;
+
+
+//-----------------------------------------------------------------------------
+// Global interfaces
+//-----------------------------------------------------------------------------
+class CNetworkSystem;
+extern CNetworkSystem *g_pNetworkSystemImp;
+
+
+//-----------------------------------------------------------------------------
+// Implementation of the network system
+//-----------------------------------------------------------------------------
+class CNetworkSystem : public CTier2AppSystem< INetworkSystem >
+{
+	typedef CTier2AppSystem< INetworkSystem > BaseClass;
+
+public:
+	// Constructor, destructor
+	CNetworkSystem();
+	virtual ~CNetworkSystem();
+
+	// Inherited from IAppSystem
+	virtual bool Connect( CreateInterfaceFn factory );
+	virtual InitReturnVal_t Init();
+	virtual void Shutdown();
+
+	// Inherited from INetworkSystem
+	virtual bool RegisterMessage( INetworkMessage *msg );
+	virtual bool StartServer( unsigned short nServerListenPort );
+	virtual void ShutdownServer( );
+	virtual void ServerReceiveMessages();
+	virtual void ServerSendMessages();
+
+	virtual bool StartClient( unsigned short nClientListenPort );
+	virtual void ShutdownClient( );
+	virtual void ClientSendMessages();
+	virtual void ClientReceiveMessages();
+	virtual INetChannel* ConnectClientToServer( const char *pServer, int nServerListenPort );
+	virtual void DisconnectClientFromServer( INetChannel* pChan );
+	virtual NetworkEvent_t *FirstNetworkEvent( );
+	virtual NetworkEvent_t *NextNetworkEvent( );
+	virtual const char* GetLocalHostName( void ) const;
+	virtual const char* GetLocalAddress( void ) const;
+
+	// Methods internal for use in networksystem library
+
+	// Method to allow systems to add network events received
+	NetworkEvent_t* CreateNetworkEvent( int nSizeInBytes );
+	template< class T > T* CreateNetworkEvent();
+	bool IsNetworkEventCreated();
+
+	// Finds a network message given a particular message type
+	INetworkMessage* FindNetworkMessage( int group, int type );
+
+	// Returns the number of bits to encode the type + group with
+	int GetTypeBitCount() const;
+	int GetGroupBitCount() const;
+
+	// Returns the current time
+	float GetTime( void );
+
+	// Converts a string to a socket address 
+	bool StringToSockaddr( const char *s, struct sockaddr *sadr );
+
+	// Queues up a network packet
+	void EnqueueConnectionlessNetworkPacket( CNetPacket *pPacket, IConnectionlessPacketHandler *pHandler );
+	void EnqueueNetworkPacket( CNetPacket *pPacket, CNetChannel *pNetChannel );
+
+private:
+	struct PacketInfo_t
+	{
+		CNetPacket *m_pPacket;
+		IConnectionlessPacketHandler *m_pHandler;
+		CNetChannel *m_pNetChannel;
+	};
+
+	// Network event iteration helpers
+	bool StartProcessingNewPacket();
+	bool AdvanceProcessingNetworkPacket( );
+	void CleanupNetworkMessages( );
+
+	bool m_bWinsockInitialized : 1;
+	bool m_bNetworkEventCreated : 1;
+	bool m_bInMidPacket : 1;
+	int m_nTypeBits;
+	int m_nGroupBits;
+	netadr_t m_LocalAddress;
+	CUtlString m_LocalAddressString;
+	CUtlString m_LocalHostName;
+	CNetworkServer *m_pServer;
+	CNetworkClient *m_pClient;
+	unsigned char m_EventMessageBuffer[256];
+	CUtlVector<PacketInfo_t> m_PacketQueue;
+	int m_nProcessingPacket;
+	CUtlVector<INetworkMessage*> m_NetworkMessages;
+};
+
+
+//-----------------------------------------------------------------------------
+// Inline methods
+//-----------------------------------------------------------------------------
+template< class T > 
+T* CNetworkSystem::CreateNetworkEvent()
+{
+	// Increase the size of m_EventMessageBuffer if this assertion fails
+	COMPILE_TIME_ASSERT( sizeof(T) <= sizeof( m_EventMessageBuffer ) );
+	return (T*)CreateNetworkEvent( sizeof(T) );
+}
+
+	
+//-----------------------------------------------------------------------------
+// Returns the number of bits to encode the type + group with
+//-----------------------------------------------------------------------------
+inline int CNetworkSystem::GetTypeBitCount() const
+{
+	return m_nTypeBits;
+}
+
+inline int CNetworkSystem::GetGroupBitCount() const
+{
+	return m_nGroupBits;
+}
+
+	
+//-----------------------------------------------------------------------------
+// Writes a system network message
+//-----------------------------------------------------------------------------
+inline void WriteSystemNetworkMessage( bf_write &msg, SystemNetworkMessageType_t type )
+{
+	msg.WriteUBitLong( net_group_networksystem, g_pNetworkSystemImp->GetGroupBitCount() );
+	msg.WriteUBitLong( type, g_pNetworkSystemImp->GetTypeBitCount() );
+}
+
+inline void WriteNetworkMessage( bf_write &msg, INetworkMessage *pNetworkMessage )
+{
+	msg.WriteUBitLong( pNetworkMessage->GetGroup(), g_pNetworkSystemImp->GetGroupBitCount() );
+	msg.WriteUBitLong( pNetworkMessage->GetType(), g_pNetworkSystemImp->GetTypeBitCount() );
+}
+
+#endif // NETWORKSYSTEM_H
+