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diff --git a/public/iservernetworkable.h b/public/iservernetworkable.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef ISERVERNETWORKABLE_H
+#define ISERVERNETWORKABLE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "ihandleentity.h"
+#include "basetypes.h"
+#include "bitvec.h"
+#include "const.h"
+#include "bspfile.h"
+
+
+
+// Entities can span this many clusters before we revert to a slower area checking algorithm
+#define	MAX_FAST_ENT_CLUSTERS	4
+#define	MAX_ENT_CLUSTERS	64
+#define MAX_WORLD_AREAS		8
+
+
+class ServerClass;
+class SendTable;
+struct edict_t;
+class CBaseEntity;
+class CSerialEntity;
+class CBaseNetworkable;
+
+
+class CCheckTransmitInfo
+{
+public:
+	edict_t	*m_pClientEnt;	// pointer to receiver edict
+	byte	m_PVS[PAD_NUMBER( MAX_MAP_CLUSTERS,8 ) / 8];
+	int		m_nPVSSize;		// PVS size in bytes
+
+	CBitVec<MAX_EDICTS>	*m_pTransmitEdict;	// entity n is already marked for transmission
+	CBitVec<MAX_EDICTS>	*m_pTransmitAlways; // entity n is always sent even if not in PVS (HLTV and Replay only)
+	
+	int 	m_AreasNetworked; // number of networked areas 
+	int		m_Areas[MAX_WORLD_AREAS]; // the areas
+	
+	// This is used to determine visibility, so if the previous state
+	// is the same as the current state (along with pvs and areas networked),
+	// then the parts of the map that the player can see haven't changed.
+	byte	m_AreaFloodNums[MAX_MAP_AREAS];
+	int		m_nMapAreas;
+};
+
+//-----------------------------------------------------------------------------
+// Stores information necessary to perform PVS testing.
+//-----------------------------------------------------------------------------
+struct PVSInfo_t
+{
+	// headnode for the entity's bounding box
+	short		m_nHeadNode;			
+
+	// number of clusters or -1 if too many
+	short		m_nClusterCount;		
+
+	// cluster indices
+	unsigned short *m_pClusters;	
+
+	// For dynamic "area portals"
+	short		m_nAreaNum;
+	short		m_nAreaNum2;
+
+	// current position
+	float		m_vCenter[3];
+
+private:
+	unsigned short m_pClustersInline[MAX_FAST_ENT_CLUSTERS];
+
+	friend class CVEngineServer;
+};
+
+
+// IServerNetworkable is the interface the engine uses for all networkable data.
+class IServerNetworkable
+{
+// These functions are handled automatically by the server_class macros and CBaseNetworkable.
+public:
+	// Gets at the entity handle associated with the collideable
+	virtual IHandleEntity	*GetEntityHandle() = 0;
+
+	// Tell the engine which class this object is.
+	virtual ServerClass*	GetServerClass() = 0;
+
+	virtual edict_t			*GetEdict() const = 0;
+
+	virtual const char*		GetClassName() const = 0;
+	virtual void			Release() = 0;
+
+	virtual int				AreaNum() const = 0;
+
+	// In place of a generic QueryInterface.
+	virtual CBaseNetworkable* GetBaseNetworkable() = 0;
+	virtual CBaseEntity*	GetBaseEntity() = 0; // Only used by game code.
+	virtual PVSInfo_t*		GetPVSInfo() = 0; // get current visibilty data
+
+protected:
+	// Should never call delete on this! 
+	virtual					~IServerNetworkable() {}
+};
+
+
+#endif // ISERVERNETWORKABLE_H