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diff --git a/external/vpc/public/vstdlib/ikeyvaluessystem.h b/external/vpc/public/vstdlib/ikeyvaluessystem.h
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+++ b/external/vpc/public/vstdlib/ikeyvaluessystem.h
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+//========= Copyright � 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#ifndef VSTDLIB_IKEYVALUESSYSTEM_H
+#define VSTDLIB_IKEYVALUESSYSTEM_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "vstdlib/vstdlib.h"
+
+// handle to a KeyValues key name symbol
+typedef int HKeySymbol;
+#define INVALID_KEY_SYMBOL (-1)
+
+//-----------------------------------------------------------------------------
+// Purpose: Interface to shared data repository for KeyValues (included in vgui_controls.lib)
+//			allows for central data storage point of KeyValues symbol table
+//-----------------------------------------------------------------------------
+class IKeyValuesSystem
+{
+public:
+	// registers the size of the KeyValues in the specified instance
+	// so it can build a properly sized memory pool for the KeyValues objects
+	// the sizes will usually never differ but this is for versioning safety
+	virtual void RegisterSizeofKeyValues(int size) = 0;
+
+	// allocates/frees a KeyValues object from the shared mempool
+	virtual void *AllocKeyValuesMemory(int size) = 0;
+	virtual void FreeKeyValuesMemory(void *pMem) = 0;
+
+	// symbol table access (used for key names)
+	virtual HKeySymbol GetSymbolForString( const char *name, bool bCreate = true ) = 0;
+	virtual const char *GetStringForSymbol(HKeySymbol symbol) = 0;
+
+	// for debugging, adds KeyValues record into global list so we can track memory leaks
+	virtual void AddKeyValuesToMemoryLeakList(void *pMem, HKeySymbol name) = 0;
+	virtual void RemoveKeyValuesFromMemoryLeakList(void *pMem) = 0;
+
+	// set/get a value for keyvalues resolution symbol
+	// e.g.: SetKeyValuesExpressionSymbol( "LOWVIOLENCE", true ) - enables [$LOWVIOLENCE]
+	virtual void SetKeyValuesExpressionSymbol( const char *name, bool bValue ) = 0;
+	virtual bool GetKeyValuesExpressionSymbol( const char *name ) = 0;
+
+	// symbol table access from code with case-preserving requirements (used for key names)
+	virtual HKeySymbol GetSymbolForStringCaseSensitive( HKeySymbol &hCaseInsensitiveSymbol, const char *name, bool bCreate = true ) = 0;
+};
+
+VSTDLIB_INTERFACE IKeyValuesSystem *KeyValuesSystem();
+
+// #define KEYVALUESSYSTEM_INTERFACE_VERSION "KeyValuesSystem002"
+
+#endif // VSTDLIB_IKEYVALUESSYSTEM_H