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diff --git a/public/tier1/kvpacker.h b/public/tier1/kvpacker.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef KVPACKER_H
+#define KVPACKER_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "KeyValues.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: Handles packing KeyValues binary packing and unpacking in a a
+//			consistent way across all branches, including Steam. If you change
+//			this packing format you need to do so in a backward compatible way
+//			so that the Steam servers and all the various GCs can still talk to
+//			each other.
+//-----------------------------------------------------------------------------
+class KVPacker
+{
+public:
+	bool WriteAsBinary( KeyValues *pNode, CUtlBuffer &buffer );
+	bool ReadAsBinary( KeyValues *pNode, CUtlBuffer &buffer );
+
+private:
+	// These types are used for serialization of KeyValues nodes.
+	// Do not renumber them or you will break serialization across
+	// branches.
+	enum EPackType
+	{
+		PACKTYPE_NONE = 0,
+		PACKTYPE_STRING,
+		PACKTYPE_INT,
+		PACKTYPE_FLOAT,
+		PACKTYPE_PTR,
+		PACKTYPE_WSTRING,
+		PACKTYPE_COLOR,
+		PACKTYPE_UINT64,
+		PACKTYPE_NULLMARKER,				// used to mark the end of a block in the binary format
+	};
+};
+
+
+#endif // KVPACKER_H