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diff --git a/engines/sword25/kernel/persistenceblock.h b/engines/sword25/kernel/persistenceblock.h
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+++ b/engines/sword25/kernel/persistenceblock.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_PERSISTENCEBLOCK_H
+#define SWORD25_PERSISTENCEBLOCK_H
+
+// -----------------------------------------------------------------------------
+// Includes
+// -----------------------------------------------------------------------------
+
+#include "sword25/kernel/common.h"
+
+namespace Sword25 {
+
+// -----------------------------------------------------------------------------
+// Class definition
+// -----------------------------------------------------------------------------
+
+class PersistenceBlock {
+public:
+	static uint GetSInt32Size() {
+		return sizeof(signed int) + sizeof(byte);
+	}
+	static uint GetUInt32Size() {
+		return sizeof(uint) + sizeof(byte);
+	}
+	static uint GetFloat32Size() {
+		return sizeof(float) + sizeof(byte);
+	}
+	static uint GetBoolSize() {
+		return sizeof(byte) + sizeof(byte);
+	}
+	static uint GetStringSize(const Common::String &String) {
+		return static_cast<uint>(sizeof(uint) + String.size() + sizeof(byte));
+	}
+
+protected:
+	enum {
+		SINT_MARKER,
+		UINT_MARKER,
+		FLOAT_MARKER,
+		STRING_MARKER,
+		BOOL_MARKER,
+		BLOCK_MARKER
+	};
+
+	// -----------------------------------------------------------------------------
+	// Endianess Conversions
+	// -----------------------------------------------------------------------------
+	//
+	// Everything is stored in Little Endian
+	// Big Endian Systems will need to be byte swapped during both saving and reading of saved values
+	//
+
+	template<typename T>
+	static T ConvertEndianessFromSystemToStorage(T Value) {
+		if (IsBigEndian()) ReverseByteOrder(&Value);
+		return Value;
+	}
+
+	template<typename T>
+	static T ConvertEndianessFromStorageToSystem(T Value) {
+		if (IsBigEndian()) ReverseByteOrder(&Value);
+		return Value;
+	}
+
+private:
+	static bool IsBigEndian() {
+		uint Dummy = 1;
+		byte *DummyPtr = reinterpret_cast<byte *>(&Dummy);
+		return DummyPtr[0] == 0;
+	}
+
+	template<typename T>
+	static void Swap(T &One, T &Two) {
+		T Temp = One;
+		One = Two;
+		Two = Temp;
+	}
+
+	static void ReverseByteOrder(void *Ptr) {
+		// Reverses the byte order of the 32-bit word pointed to by Ptr
+		byte *CharPtr = static_cast<byte *>(Ptr);
+		Swap(CharPtr[0], CharPtr[3]);
+		Swap(CharPtr[1], CharPtr[2]);
+	}
+};
+
+// -----------------------------------------------------------------------------
+// Compile time asserts
+// -----------------------------------------------------------------------------
+
+#define CTASSERT(ex) typedef char ctassert_type[(ex) ? 1 : -1]
+CTASSERT(sizeof(byte) == 1);
+CTASSERT(sizeof(signed int) == 4);
+CTASSERT(sizeof(uint) == 4);
+CTASSERT(sizeof(float) == 4);
+#undef CTASSERT
+
+} // End of namespace Sword25
+
+#endif