Added original SDK code for Alien Swarm.

public/stringregistry.h

@@ -0,0 +1,57 @@
+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose:		A registry of strings and associated ints
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef STRINGREGISTRY_H
+#define STRINGREGISTRY_H
+#pragma once
+
+struct StringTable_t;
+
+//-----------------------------------------------------------------------------
+// Purpose: Just a convenience/legacy wrapper for CUtlDict<> .
+//-----------------------------------------------------------------------------
+class CStringRegistry
+{
+private:
+	StringTable_t	*m_pStringList;
+
+public:
+	// returns a key for a given string
+	unsigned short AddString(const char *stringText, int stringID);
+
+	// This is optimized.  It will do 2 O(logN) searches
+	// Only one of the searches needs to compare strings, the other compares symbols (ints)
+	// returns -1 if the string is not present in the registry.
+	int		GetStringID(const char *stringText);
+
+	// This is unoptimized.  It will linearly search (but only compares ints, not strings)
+	const char	*GetStringText(int stringID);
+
+	// This is O(1).  It will not search.  key MUST be a value that was returned by AddString
+	const char *GetStringForKey(unsigned short key);
+	// This is O(1).  It will not search.  key MUST be a value that was returned by AddString
+	int		GetIDForKey(unsigned short key);
+
+	void	ClearStrings(void);
+
+
+	// Iterate all the keys.
+	unsigned short First() const;
+	unsigned short Next( unsigned short key ) const;
+	unsigned short InvalidIndex() const;
+
+	~CStringRegistry(void);			// Need to free allocated memory
+	CStringRegistry(void);
+};
+
+#endif // STRINGREGISTRY_H