added barriers, started working on libraries

public/tier2/ifilesystem.h

@@ -3,6 +3,7 @@
 
 #include "iappsystem.h"
 #include "tier0/platform.h"
+#include "tier1/utlbuffer.h"
 
 enum EFileMode
 {
@@ -55,6 +56,9 @@ public:
 
 	virtual void Close( IFileHandle *pFile ) = 0;
 
+	// Some cool stuff
+	virtual CUtlBuffer<unsigned char> Read( IFileHandle *pFile ) = 0;
+
 	IFileSystem *m_pNext;
 	
 	void RegisterFileSystem();