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diff --git a/src/utility/stringProxy.hpp b/src/utility/stringProxy.hpp
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+++ b/src/utility/stringProxy.hpp
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+//
+// VMime library (http://vmime.sourceforge.net)
+// Copyright (C) 2002-2004 Vincent Richard <[email protected]>
+//
+// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#ifndef VMIME_UTILITY_STRINGPROXY_HPP_INCLUDED
+#define VMIME_UTILITY_STRINGPROXY_HPP_INCLUDED
+
+
+#include <limits>
+
+#include "../types.hpp"
+#include "stream.hpp"
+
+
+namespace vmime {
+namespace utility {
+
+
+/** This class is a proxy for the string class. This takes
+  * advantage of the COW (copy-on-write) system that might
+  * be used in "std::string" implementation.
+  */
+
+class stringProxy
+{
+public:
+
+	typedef string::size_type size_type;
+	typedef string string_type;
+
+
+	// Consruction
+	stringProxy();
+	stringProxy(const stringProxy& s);
+	stringProxy(const string_type& s, const size_type start = 0, const size_type end = std::numeric_limits <size_type>::max());
+
+	// Assignment
+	void set(const string_type& s, const size_type start = 0, const size_type end = std::numeric_limits <size_type>::max());
+	void detach();
+
+	stringProxy& operator=(const stringProxy& s);
+	stringProxy& operator=(const string_type& s);
+
+	// Extract some portion (or whole) of the string
+	// and output it into a stream.
+	void extract(outputStream& os, const size_type start = 0, const size_type end = std::numeric_limits <size_type>::max()) const;
+
+	// Return the "virtual" length of the string
+	const size_type length() const;
+
+	// Return the boundaries of the "virtual" string
+	const size_type start() const;
+	const size_type end() const;
+
+	string::const_iterator it_begin() const { return (m_buffer.begin() + m_start); }
+	string::const_iterator it_end() const { return (m_buffer.begin() + m_end); }
+
+private:
+
+	string_type m_buffer;
+
+	size_type m_start;
+	size_type m_end;
+};
+
+
+std::ostream& operator<<(std::ostream& os, const stringProxy& s);
+outputStream& operator<<(outputStream& os, const stringProxy& s);
+
+
+} // utility
+} // vmime
+
+
+#endif // VMIME_UTILITY_STRINGPROXY_HPP_INCLUDED