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diff --git a/vmime-master/src/vmime/utility/stream.hpp b/vmime-master/src/vmime/utility/stream.hpp
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+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
+//
+// 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 3 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.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library.  Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#ifndef VMIME_UTILITY_STREAM_HPP_INCLUDED
+#define VMIME_UTILITY_STREAM_HPP_INCLUDED
+
+
+#include <sstream>
+
+#include "vmime/config.hpp"
+#include "vmime/types.hpp"
+#include "vmime/base.hpp"
+
+
+namespace vmime {
+namespace utility {
+
+
+/** Base class for input/output stream.
+  */
+class VMIME_EXPORT stream : public object, private noncopyable {
+
+public:
+
+	virtual ~stream() { }
+
+	/** Return the preferred maximum block size when reading
+	  * from or writing to this stream.
+	  *
+	  * @return block size, in bytes
+	  */
+	virtual size_t getBlockSize();
+};
+
+
+} // utility
+} // vmime
+
+
+#endif // VMIME_UTILITY_STREAM_HPP_INCLUDED