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diff --git a/engines/sword25/kernel/callbackregistry.h b/engines/sword25/kernel/callbackregistry.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+/*
+ * This code is based on Broken Sword 2.5 engine
+ *
+ * Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
+ *
+ * Licensed under GNU GPL v2
+ *
+ */
+
+#ifndef SWORD25_CALLBACK_REGISTRY_H
+#define SWORD25_CALLBACK_REGISTRY_H
+
+// -----------------------------------------------------------------------------
+// Includes
+// -----------------------------------------------------------------------------
+
+#include "common/scummsys.h"
+#include "common/str.h"
+#include "common/hash-str.h"
+#include "common/hashmap.h"
+#include "sword25/kernel/bs_stdint.h"
+#include "sword25/kernel/common.h"
+
+namespace Sword25 {
+
+// -----------------------------------------------------------------------------
+// Klassendeklaration
+// -----------------------------------------------------------------------------
+
+typedef void (*CallbackPtr)(int command);
+
+class CallbackRegistry {
+public:
+	static CallbackRegistry &getInstance() {
+		static CallbackRegistry _instance;
+		return _instance;
+	}
+
+	bool        registerCallbackFunction(const Common::String &name, CallbackPtr ptr);
+	CallbackPtr     resolveCallbackFunction(const Common::String &name) const;
+	Common::String  resolveCallbackPointer(CallbackPtr ptr) const;
+
+private:
+	typedef Common::HashMap<Common::String, CallbackPtr, Common::CaseSensitiveString_Hash, Common::CaseSensitiveString_EqualTo> NameToPtrMap;
+	NameToPtrMap _nameToPtrMap;
+
+	struct CallbackPtr_EqualTo {
+		bool operator()(CallbackPtr x, CallbackPtr y) const {
+			return x == y;
+		}
+	};
+	struct CallbackPtr_Hash {
+		uint operator()(CallbackPtr x) const {
+			return static_cast<uint>((int64)x % ((int64)1 << sizeof(uint)));
+		}
+	};
+
+	typedef Common::HashMap<CallbackPtr, Common::String, CallbackPtr_Hash, CallbackPtr_EqualTo> PtrToNameMap;
+	PtrToNameMap _ptrToNameMap;
+
+	CallbackPtr     findPtrByName(const Common::String &name) const;
+	Common::String  findNameByPtr(CallbackPtr ptr) const;
+	void        storeCallbackFunction(const Common::String &name, CallbackPtr ptr);
+};
+
+} // End of namespace Sword25
+
+#endif