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engine/sv_packedentities.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+
+#include "server_pch.h"
+#include "client.h"
+#include "sv_packedentities.h"
+#include "bspfile.h"
+#include "eiface.h"
+#include "dt_send_eng.h"
+#include "dt_common_eng.h"
+#include "changeframelist.h"
+#include "sv_main.h"
+#include "hltvserver.h"
+#if defined( REPLAY_ENABLED )
+#include "replayserver.h"
+#endif
+#include "dt_instrumentation_server.h"
+#include "LocalNetworkBackdoor.h"
+#include "tier0/vprof.h"
+#include "host.h"
+#include "networkstringtableserver.h"
+#include "networkstringtable.h"
+#include "utlbuffer.h"
+#include "dt.h"
+#include "con_nprint.h"
+#include "smooth_average.h"
+#include "vengineserver_impl.h"
+#include "tier0/vcrmode.h"
+#include "vstdlib/jobthread.h"
+#include "enginethreads.h"
+
+#ifdef SWDS
+IClientEntityList *entitylist = NULL;
+#endif
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+ConVar sv_debugmanualmode( "sv_debugmanualmode", "0", 0, "Make sure entities correctly report whether or not their network data has changed." );
+
+// Returns false and calls Host_Error if the edict's pvPrivateData is NULL.
+static inline bool SV_EnsurePrivateData(edict_t *pEdict)
+{
+	if(pEdict->GetUnknown())
+	{
+		return true;
+	}
+	else
+	{
+		Host_Error("SV_EnsurePrivateData: pEdict->pvPrivateData==NULL (ent %d).\n", pEdict - sv.edicts);
+		return false;
+	}
+}
+
+// This function makes sure that this entity class has an instance baseline.
+// If it doesn't have one yet, it makes a new one.
+void SV_EnsureInstanceBaseline( ServerClass *pServerClass, int iEdict, const void *pData, int nBytes )
+{
+	edict_t *pEnt = &sv.edicts[iEdict];
+	ErrorIfNot( pEnt->GetNetworkable(),
+		("SV_EnsureInstanceBaseline: edict %d missing ent", iEdict)
+	);
+
+	ServerClass *pClass = pEnt->GetNetworkable()->GetServerClass();
+
+	// See if we already have a baseline for this class.
+	if ( pClass->m_InstanceBaselineIndex == INVALID_STRING_INDEX )
+	{
+		AUTO_LOCK( g_svInstanceBaselineMutex );
+
+		// We need this second check in case multiple instances of the same class have grabbed the lock.
+		if ( pClass->m_InstanceBaselineIndex == INVALID_STRING_INDEX )
+		{
+			char idString[32];
+			Q_snprintf( idString, sizeof( idString ), "%d", pClass->m_ClassID );
+
+			// Ok, make a new instance baseline so they can reference it.
+			int temp = sv.GetInstanceBaselineTable()->AddString( 
+				true,
+				idString,	// Note we're sending a string with the ID number, not the class name.
+				nBytes,
+				pData );
+
+			// Insert a compiler and/or CPU memory barrier to ensure that all side-effects have
+			// been published before the index is published. Otherwise the string index may
+			// be visible before its initialization has finished. This potential problem is caused
+			// by the use of double-checked locking -- the problem is that the code outside of the
+			// lock is looking at the variable that is protected by the lock. See this article for details:
+			// http://en.wikipedia.org/wiki/Double-checked_locking
+			// Write-release barrier
+			ThreadMemoryBarrier();
+			pClass->m_InstanceBaselineIndex = temp;
+			Assert( pClass->m_InstanceBaselineIndex != INVALID_STRING_INDEX );
+		}
+	}
+	// Read-acquire barrier
+	ThreadMemoryBarrier();
+}
+
+//-----------------------------------------------------------------------------
+// Pack the entity....
+//-----------------------------------------------------------------------------
+
+static inline void SV_PackEntity( 
+	int edictIdx, 
+	edict_t* edict, 
+	ServerClass* pServerClass,
+	CFrameSnapshot *pSnapshot )
+{
+	Assert( edictIdx < pSnapshot->m_nNumEntities );
+	tmZoneFiltered( TELEMETRY_LEVEL0, 50, TMZF_NONE, "PackEntities_Normal%s", __FUNCTION__ );
+
+	int iSerialNum = pSnapshot->m_pEntities[ edictIdx ].m_nSerialNumber;
+
+	// Check to see if this entity specifies its changes.
+	// If so, then try to early out making the fullpack
+	bool bUsedPrev = false;
+
+	if ( !edict->HasStateChanged() )
+	{
+		// Now this may not work if we didn't previously send a packet;
+		// if not, then we gotta compute it
+		bUsedPrev = framesnapshotmanager->UsePreviouslySentPacket( pSnapshot, edictIdx, iSerialNum );
+	}
+		
+	if ( bUsedPrev && !sv_debugmanualmode.GetInt() )
+	{
+		edict->ClearStateChanged();
+		return;
+	}
+	
+	// First encode the entity's data.
+	ALIGN4 char packedData[MAX_PACKEDENTITY_DATA] ALIGN4_POST;
+	bf_write writeBuf( "SV_PackEntity->writeBuf", packedData, sizeof( packedData ) );
+
+	SendTable *pSendTable = pServerClass->m_pTable;
+	
+	// (avoid constructor overhead).
+	unsigned char tempData[ sizeof( CSendProxyRecipients ) * MAX_DATATABLE_PROXIES ];
+	CUtlMemory< CSendProxyRecipients > recip( (CSendProxyRecipients*)tempData, pSendTable->m_pPrecalc->GetNumDataTableProxies() );
+
+	if( !SendTable_Encode( pSendTable, edict->GetUnknown(), &writeBuf, edictIdx, &recip, false ) )
+	{							 
+		Host_Error( "SV_PackEntity: SendTable_Encode returned false (ent %d).\n", edictIdx );
+	}
+
+#ifndef NO_VCR
+	// VCR mode stuff..
+	if ( vcr_verbose.GetInt() && writeBuf.GetNumBytesWritten() > 0 )
+		VCRGenericValueVerify( "writebuf", writeBuf.GetBasePointer(), writeBuf.GetNumBytesWritten()-1 );
+#endif
+
+	SV_EnsureInstanceBaseline( pServerClass, edictIdx, packedData, writeBuf.GetNumBytesWritten() );
+		
+	int nFlatProps = SendTable_GetNumFlatProps( pSendTable );
+	IChangeFrameList *pChangeFrame = NULL;
+
+	// If this entity was previously in there, then it should have a valid IChangeFrameList 
+	// which we can delta against to figure out which properties have changed.
+	//
+	// If not, then we want to setup a new IChangeFrameList.
+
+	PackedEntity *pPrevFrame = framesnapshotmanager->GetPreviouslySentPacket( edictIdx, pSnapshot->m_pEntities[ edictIdx ].m_nSerialNumber );
+	if ( pPrevFrame )
+	{
+		// Calculate a delta.
+		Assert( !pPrevFrame->IsCompressed() );
+		
+		int deltaProps[MAX_DATATABLE_PROPS];
+
+		int nChanges = SendTable_CalcDelta(
+			pSendTable, 
+			pPrevFrame->GetData(), pPrevFrame->GetNumBits(),
+			packedData,	writeBuf.GetNumBitsWritten(),
+			
+			deltaProps,
+			ARRAYSIZE( deltaProps ),
+
+			edictIdx
+			);
+
+#ifndef NO_VCR
+		if ( vcr_verbose.GetInt() )
+			VCRGenericValueVerify( "nChanges", &nChanges, sizeof( nChanges ) );
+#endif
+
+		// If it's non-manual-mode, but we detect that there are no changes here, then just
+		// use the previous pSnapshot if it's available (as though the entity were manual mode).
+		// It would be interesting to hook here and see how many non-manual-mode entities 
+		// are winding up with no changes.
+		if ( nChanges == 0 )
+		{
+			if ( pPrevFrame->CompareRecipients( recip ) )
+			{
+				if ( framesnapshotmanager->UsePreviouslySentPacket( pSnapshot, edictIdx, iSerialNum ) )
+				{
+					edict->ClearStateChanged();
+					return;
+				}
+			}
+		}
+		else
+		{
+			if ( !edict->HasStateChanged() )
+			{
+				for ( int iDeltaProp=0; iDeltaProp < nChanges; iDeltaProp++ )
+				{
+					Assert( pSendTable->m_pPrecalc );
+					Assert( deltaProps[iDeltaProp] < pSendTable->m_pPrecalc->GetNumProps() );
+
+					const SendProp *pProp = pSendTable->m_pPrecalc->GetProp( deltaProps[iDeltaProp] );
+					// If a field changed, but it changed because it encoded against tickcount, 
+					//   then it's just like the entity changed the underlying field, not an error, that is.
+					if ( pProp->GetFlags() & SPROP_ENCODED_AGAINST_TICKCOUNT )
+						continue;
+
+					Msg( "Entity %d (class '%s') reported ENTITY_CHANGE_NONE but '%s' changed.\n", 
+						edictIdx,
+						edict->GetClassName(),
+						pProp->GetName() );
+
+				}
+			}
+		}
+
+#ifndef _XBOX	
+#if defined( REPLAY_ENABLED )
+		if ( (hltv && hltv->IsActive()) || (replay && replay->IsActive()) )
+#else
+		if ( hltv && hltv->IsActive() )
+#endif
+		{
+			// in HLTV or Replay mode every PackedEntity keeps it's own ChangeFrameList
+			// we just copy the ChangeFrameList from prev frame and update it
+			pChangeFrame = pPrevFrame->GetChangeFrameList();
+			pChangeFrame = pChangeFrame->Copy(); // allocs and copies ChangeFrameList
+		}
+		else
+#endif
+		{
+			// Ok, now snag the changeframe from the previous frame and update the 'last frame changed'
+			// for the properties in the delta.
+			pChangeFrame = pPrevFrame->SnagChangeFrameList();
+		}
+		
+		ErrorIfNot( pChangeFrame,
+			("SV_PackEntity: SnagChangeFrameList returned null") );
+		ErrorIfNot( pChangeFrame->GetNumProps() == nFlatProps,
+			("SV_PackEntity: SnagChangeFrameList mismatched number of props[%d vs %d]", nFlatProps, pChangeFrame->GetNumProps() ) );
+
+		pChangeFrame->SetChangeTick( deltaProps, nChanges, pSnapshot->m_nTickCount );
+	}
+	else
+	{
+		// Ok, init the change frames for the first time.
+		pChangeFrame = AllocChangeFrameList( nFlatProps, pSnapshot->m_nTickCount );
+	}
+
+	// Now make a PackedEntity and store the new packed data in there.
+	{
+		PackedEntity *pPackedEntity = framesnapshotmanager->CreatePackedEntity( pSnapshot, edictIdx );
+		pPackedEntity->SetChangeFrameList( pChangeFrame );
+		pPackedEntity->SetServerAndClientClass( pServerClass, NULL );
+		pPackedEntity->AllocAndCopyPadded( packedData, writeBuf.GetNumBytesWritten() );
+		pPackedEntity->SetRecipients( recip );
+	}
+
+	edict->ClearStateChanged();
+}
+
+// in HLTV mode we ALWAYS have to store position and PVS info, even if entity didnt change
+void SV_FillHLTVData( CFrameSnapshot *pSnapshot, edict_t *edict, int iValidEdict )
+{
+#if !defined( _XBOX )
+	if ( pSnapshot->m_pHLTVEntityData && edict )
+	{
+		CHLTVEntityData *pHLTVData = &pSnapshot->m_pHLTVEntityData[iValidEdict];
+
+		PVSInfo_t *pvsInfo = edict->GetNetworkable()->GetPVSInfo();
+
+		if ( pvsInfo->m_nClusterCount == 1 )
+		{
+			// store cluster, if entity spawns only over one cluster
+			pHLTVData->m_nNodeCluster = pvsInfo->m_pClusters[0];
+		}
+		else
+		{
+			// otherwise save PVS head node for larger entities
+			pHLTVData->m_nNodeCluster = pvsInfo->m_nHeadNode | (1<<31);
+		}
+
+		// remember origin
+		pHLTVData->origin[0] = pvsInfo->m_vCenter[0];
+		pHLTVData->origin[1] = pvsInfo->m_vCenter[1];
+		pHLTVData->origin[2] = pvsInfo->m_vCenter[2];
+	}
+#endif
+}
+
+// in Replay mode we ALWAYS have to store position and PVS info, even if entity didnt change
+void SV_FillReplayData( CFrameSnapshot *pSnapshot, edict_t *edict, int iValidEdict )
+{
+#if !defined( _XBOX )
+	if ( pSnapshot->m_pReplayEntityData && edict )
+	{
+		CReplayEntityData *pReplayData = &pSnapshot->m_pReplayEntityData[iValidEdict];
+
+		PVSInfo_t *pvsInfo = edict->GetNetworkable()->GetPVSInfo();
+
+		if ( pvsInfo->m_nClusterCount == 1 )
+		{
+			// store cluster, if entity spawns only over one cluster
+			pReplayData->m_nNodeCluster = pvsInfo->m_pClusters[0];
+		}
+		else
+		{
+			// otherwise save PVS head node for larger entities
+			pReplayData->m_nNodeCluster = pvsInfo->m_nHeadNode | (1<<31);
+		}
+
+		// remember origin
+		pReplayData->origin[0] = pvsInfo->m_vCenter[0];
+		pReplayData->origin[1] = pvsInfo->m_vCenter[1];
+		pReplayData->origin[2] = pvsInfo->m_vCenter[2];
+	}
+#endif
+}
+
+// Returns the SendTable that should be used with the specified edict.
+SendTable* GetEntSendTable(edict_t *pEdict)
+{
+	if ( pEdict->GetNetworkable() )
+	{
+		ServerClass *pClass = pEdict->GetNetworkable()->GetServerClass();
+		if ( pClass )
+		{
+			return pClass->m_pTable;
+		}
+	}
+
+	return NULL;
+}
+
+
+void PackEntities_NetworkBackDoor( 
+	int clientCount, 
+	CGameClient **clients,
+	CFrameSnapshot *snapshot )
+{
+	Assert( clientCount == 1 );
+
+	VPROF_BUDGET( "PackEntities_NetworkBackDoor", VPROF_BUDGETGROUP_OTHER_NETWORKING );
+
+	CGameClient *client = clients[0];	// update variables cl, pInfo, frame for current client
+	CCheckTransmitInfo *pInfo =  &client->m_PackInfo;
+
+	for ( int iValidEdict=0; iValidEdict < snapshot->m_nValidEntities; iValidEdict++ )
+	{
+		int index = snapshot->m_pValidEntities[iValidEdict];
+		edict_t* edict = &sv.edicts[ index ];
+		
+		// this is a bit of a hack to ensure that we get a "preview" of the
+		//  packet timstamp that the server will send so that things that
+		//  are encoded relative to packet time will be correct
+		Assert( edict->m_NetworkSerialNumber != -1 );
+
+		bool bShouldTransmit = pInfo->m_pTransmitEdict->Get( index ) ? true : false;
+
+		//CServerDTITimer timer( pSendTable, SERVERDTI_ENCODE );
+		// If we're using the fast path for a single-player game, just pass the entity
+		// directly over to the client.
+		Assert( index < snapshot->m_nNumEntities );
+		ServerClass *pSVClass = snapshot->m_pEntities[ index ].m_pClass;
+		g_pLocalNetworkBackdoor->EntState( index, edict->m_NetworkSerialNumber, 
+			pSVClass->m_ClassID, pSVClass->m_pTable, edict->GetUnknown(), edict->HasStateChanged(), bShouldTransmit );
+		edict->ClearStateChanged();
+	}
+	
+	// Tell the client about any entities that are now dormant.
+	g_pLocalNetworkBackdoor->ProcessDormantEntities();
+	InvalidateSharedEdictChangeInfos();
+}
+
+static ConVar sv_parallel_packentities( "sv_parallel_packentities", "1" );
+
+struct PackWork_t
+{
+	int				nIdx;
+	edict_t			*pEdict;
+	CFrameSnapshot	*pSnapshot;
+
+	static void Process( PackWork_t &item )
+	{
+		SV_PackEntity( item.nIdx, item.pEdict, item.pSnapshot->m_pEntities[ item.nIdx ].m_pClass, item.pSnapshot );
+	}
+};
+
+void PackEntities_Normal( 
+	int clientCount, 
+	CGameClient **clients,
+	CFrameSnapshot *snapshot )
+{
+	Assert( snapshot->m_nValidEntities >= 0 && snapshot->m_nValidEntities <= MAX_EDICTS );
+	tmZoneFiltered( TELEMETRY_LEVEL0, 50, TMZF_NONE, "%s %d", __FUNCTION__, snapshot->m_nValidEntities );
+
+	CUtlVectorFixed< PackWork_t, MAX_EDICTS > workItems;
+
+	// check for all active entities, if they are seen by at least on client, if
+	// so, bit pack them 
+	for ( int iValidEdict=0; iValidEdict < snapshot->m_nValidEntities; ++iValidEdict )
+	{
+		int index = snapshot->m_pValidEntities[ iValidEdict ];
+		
+		Assert( index < snapshot->m_nNumEntities );
+
+		edict_t* edict = &sv.edicts[ index ];
+
+		// if HLTV is running save PVS info for each entity
+		SV_FillHLTVData( snapshot, edict, iValidEdict );
+		
+		// if Replay is running save PVS info for each entity
+		SV_FillReplayData( snapshot, edict, iValidEdict );
+
+		// Check to see if the entity changed this frame...
+		//ServerDTI_RegisterNetworkStateChange( pSendTable, ent->m_bStateChanged );
+
+		for ( int iClient = 0; iClient < clientCount; ++iClient )
+		{
+			// entities is seen by at least this client, pack it and exit loop
+			CGameClient *client = clients[iClient];	// update variables cl, pInfo, frame for current client
+			CClientFrame *frame = client->m_pCurrentFrame;
+
+			if( frame->transmit_entity.Get( index ) )
+			{	
+				PackWork_t w;
+				w.nIdx = index;
+				w.pEdict = edict;
+				w.pSnapshot = snapshot;
+
+				workItems.AddToTail( w );
+				break;
+			}
+		}
+	}
+
+	// Process work
+	if ( sv_parallel_packentities.GetBool() )
+	{
+		ParallelProcess( "PackWork_t::Process", workItems.Base(), workItems.Count(), &PackWork_t::Process );
+	}
+	else
+	{
+		int c = workItems.Count();
+		for ( int i = 0; i < c; ++i )
+		{
+			PackWork_t &w = workItems[ i ];
+			SV_PackEntity( w.nIdx, w.pEdict, w.pSnapshot->m_pEntities[ w.nIdx ].m_pClass, w.pSnapshot );
+		}
+	}
+
+	InvalidateSharedEdictChangeInfos();
+}
+
+
+//-----------------------------------------------------------------------------
+// Writes the compressed packet of entities to all clients
+//-----------------------------------------------------------------------------
+
+void SV_ComputeClientPacks( 
+	int clientCount, 
+	CGameClient **clients,
+	CFrameSnapshot *snapshot )
+{
+	tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s", __FUNCTION__ );
+
+	MDLCACHE_CRITICAL_SECTION_(g_pMDLCache);
+	// Do some setup for each client
+	{
+		VPROF_BUDGET_FLAGS( "SV_ComputeClientPacks", "CheckTransmit", BUDGETFLAG_SERVER );
+
+		for (int iClient = 0; iClient < clientCount; ++iClient)
+		{
+			CCheckTransmitInfo *pInfo = &clients[iClient]->m_PackInfo;
+			clients[iClient]->SetupPackInfo( snapshot );
+			serverGameEnts->CheckTransmit( pInfo, snapshot->m_pValidEntities, snapshot->m_nValidEntities );
+			clients[iClient]->SetupPrevPackInfo();
+		}
+	}
+
+	VPROF_BUDGET_FLAGS( "SV_ComputeClientPacks", "ComputeClientPacks", BUDGETFLAG_SERVER );
+
+	if ( g_pLocalNetworkBackdoor )
+	{
+		// This will force network string table updates for local client to go through the backdoor if it's active
+#ifdef SHARED_NET_STRING_TABLES
+		sv.m_StringTables->TriggerCallbacks( clients[0]->m_nDeltaTick );
+#else
+		sv.m_StringTables->DirectUpdate( clients[0]->GetMaxAckTickCount() );
+#endif
+		
+		g_pLocalNetworkBackdoor->StartEntityStateUpdate();
+
+#ifndef SWDS
+		int saveClientTicks = cl.GetClientTickCount();
+		int saveServerTicks = cl.GetServerTickCount();
+		bool bSaveSimulation = cl.insimulation;
+		float flSaveLastServerTickTime = cl.m_flLastServerTickTime;
+
+		cl.insimulation = true;
+		cl.SetClientTickCount( sv.m_nTickCount );
+		cl.SetServerTickCount( sv.m_nTickCount );
+
+		cl.m_flLastServerTickTime = sv.m_nTickCount * host_state.interval_per_tick;
+		g_ClientGlobalVariables.tickcount = cl.GetClientTickCount();
+		g_ClientGlobalVariables.curtime = cl.GetTime();
+#endif
+
+		PackEntities_NetworkBackDoor( clientCount, clients, snapshot );
+
+		g_pLocalNetworkBackdoor->EndEntityStateUpdate();
+
+#ifndef SWDS
+		cl.SetClientTickCount( saveClientTicks );
+		cl.SetServerTickCount( saveServerTicks );
+		cl.insimulation = bSaveSimulation;
+		cl.m_flLastServerTickTime = flSaveLastServerTickTime;
+
+		g_ClientGlobalVariables.tickcount = cl.GetClientTickCount();
+		g_ClientGlobalVariables.curtime = cl.GetTime();
+#endif
+
+		PrintPartialChangeEntsList();
+	}
+	else
+	{
+		PackEntities_Normal( clientCount, clients, snapshot );
+	}
+}
+
+
+
+// If the table's ID is -1, writes its info into the buffer and increments curID.
+void SV_MaybeWriteSendTable( SendTable *pTable, bf_write &pBuf, bool bNeedDecoder )
+{
+	// Already sent?
+	if ( pTable->GetWriteFlag() )
+		return;
+
+	pTable->SetWriteFlag( true );
+
+	SVC_SendTable sndTbl;
+
+	byte	tmpbuf[4096];
+	sndTbl.m_DataOut.StartWriting( tmpbuf, sizeof(tmpbuf) );
+	
+	// write send table properties into message buffer
+	SendTable_WriteInfos(pTable, &sndTbl.m_DataOut );
+
+	sndTbl.m_bNeedsDecoder = bNeedDecoder;
+
+	// write message to stream
+	sndTbl.WriteToBuffer( pBuf );
+}
+
+// Calls SV_MaybeWriteSendTable recursively.
+void SV_MaybeWriteSendTable_R( SendTable *pTable, bf_write &pBuf )
+{
+	SV_MaybeWriteSendTable( pTable, pBuf, false );
+
+	// Make sure we send child send tables..
+	for(int i=0; i < pTable->m_nProps; i++)
+	{
+		SendProp *pProp = &pTable->m_pProps[i];
+
+		if( pProp->m_Type == DPT_DataTable )
+			SV_MaybeWriteSendTable_R( pProp->GetDataTable(), pBuf );
+	}
+}
+
+
+// Sets up SendTable IDs and sends an svc_sendtable for each table.
+void SV_WriteSendTables( ServerClass *pClasses, bf_write &pBuf )
+{
+	ServerClass *pCur;
+
+	DataTable_ClearWriteFlags( pClasses );
+
+	// First, we send all the leaf classes. These are the ones that will need decoders
+	// on the client.
+	for ( pCur=pClasses; pCur; pCur=pCur->m_pNext )
+	{
+		SV_MaybeWriteSendTable( pCur->m_pTable, pBuf, true );
+	}
+
+	// Now, we send their base classes. These don't need decoders on the client
+	// because we will never send these SendTables by themselves.
+	for ( pCur=pClasses; pCur; pCur=pCur->m_pNext )
+	{
+		SV_MaybeWriteSendTable_R( pCur->m_pTable, pBuf );
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : crc - 
+//-----------------------------------------------------------------------------
+void SV_ComputeClassInfosCRC( CRC32_t* crc )
+{
+	ServerClass *pClasses = serverGameDLL->GetAllServerClasses();
+
+	for ( ServerClass *pClass=pClasses; pClass; pClass=pClass->m_pNext )
+	{
+		CRC32_ProcessBuffer( crc, (void *)pClass->m_pNetworkName, Q_strlen( pClass->m_pNetworkName ) );
+		CRC32_ProcessBuffer( crc, (void *)pClass->m_pTable->GetName(), Q_strlen(pClass->m_pTable->GetName() ) );
+	}
+}
+
+void CGameServer::AssignClassIds()
+{
+	ServerClass *pClasses = serverGameDLL->GetAllServerClasses();
+
+	// Count the number of classes.
+	int nClasses = 0;
+	for ( ServerClass *pCount=pClasses; pCount; pCount=pCount->m_pNext )
+	{
+		++nClasses;
+	}
+	
+	// These should be the same! If they're not, then it should detect an explicit create message.
+	ErrorIfNot( nClasses <= MAX_SERVER_CLASSES,
+		("CGameServer::AssignClassIds: too many server classes (%i, MAX = %i).\n", nClasses, MAX_SERVER_CLASSES );
+	);
+
+	serverclasses = nClasses;
+	serverclassbits = Q_log2( serverclasses ) + 1;
+
+	bool bSpew = CommandLine()->FindParm( "-netspike" ) != 0;
+
+	int curID = 0;
+	for ( ServerClass *pClass=pClasses; pClass; pClass=pClass->m_pNext )
+	{
+		pClass->m_ClassID = curID++;
+
+		if ( bSpew )
+		{
+			Msg( "%d == '%s'\n", pClass->m_ClassID, pClass->GetName() );
+		}
+	}
+}
+
+// Assign each class and ID and write an svc_classinfo for each one.
+void SV_WriteClassInfos(ServerClass *pClasses, bf_write &pBuf)
+{
+	// Assert( sv.serverclasses < MAX_SERVER_CLASSES );
+	
+	SVC_ClassInfo classinfomsg;
+
+	classinfomsg.m_bCreateOnClient = false;
+	
+	for ( ServerClass *pClass=pClasses; pClass; pClass=pClass->m_pNext )
+	{
+		SVC_ClassInfo::class_t svclass;
+
+		svclass.classID = pClass->m_ClassID;
+		Q_strncpy( svclass.datatablename, pClass->m_pTable->GetName(), sizeof(svclass.datatablename) );
+		Q_strncpy( svclass.classname, pClass->m_pNetworkName, sizeof(svclass.classname) );
+				
+		classinfomsg.m_Classes.AddToTail( svclass );  // add all known classes to message
+	}
+
+	classinfomsg.WriteToBuffer( pBuf );
+}
+
+// This is implemented for the datatable code so its warnings can include an object's classname.
+const char* GetObjectClassName( int objectID )
+{
+	if ( objectID >= 0 && objectID < sv.num_edicts )
+	{
+		return sv.edicts[objectID].GetClassName();
+	}
+	else
+	{
+		return "[unknown]";
+	}
+}
+
+
+