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diff --git a/vmime-master/src/vmime/utility/progressListener.hpp b/vmime-master/src/vmime/utility/progressListener.hpp
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+++ b/vmime-master/src/vmime/utility/progressListener.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_PROGRESSLISTENER_HPP_INCLUDED
+#define VMIME_UTILITY_PROGRESSLISTENER_HPP_INCLUDED
+
+
+#include "vmime/config.hpp"
+#include "vmime/types.hpp"
+
+
+namespace vmime {
+namespace utility {
+
+
+/** An interface to implement if you want to be notified
+  * of a state of progress by some objects.
+  */
+class VMIME_EXPORT progressListener {
+
+protected:
+
+	virtual ~progressListener() { }
+
+public:
+
+	/** Called at the beginning of the operation.
+	  *
+	  * @param predictedTotal predicted amount of units (this has
+	  * no concrete meaning: these are not bytes, nor percentage...)
+	  */
+	virtual void start(const size_t predictedTotal) = 0;
+
+	/** Called during the operation (can be called several times).
+	  *
+	  * @param current current position
+	  * @param currentTotal adjusted total amount of units
+	  */
+	virtual void progress(const size_t current, const size_t currentTotal) = 0;
+
+	/** Called at the end of the operation.
+	  *
+	  * @param total final total amount of units
+	  */
+	virtual void stop(const size_t total) = 0;
+};
+
+
+
+/** A progress listener used when total size is known by the
+  * receiver, but not by the notifier.
+  */
+class VMIME_EXPORT progressListenerSizeAdapter : public progressListener {
+
+public:
+
+	/** Construct a new progressListenerSizeAdapter object.
+	  *
+	  * @param list wrapped progress listener (can be NULL)
+	  * @param total predicted total
+	  */
+	progressListenerSizeAdapter(progressListener* list, const size_t total);
+
+	void start(const size_t predictedTotal);
+	void progress(const size_t current, const size_t currentTotal);
+	void stop(const size_t total);
+
+private:
+
+	progressListener* m_wrapped;
+	size_t m_total;
+};
+
+
+} // utility
+} // vmime
+
+
+#endif // VMIME_UTILITY_PROGRESSLISTENER_HPP_INCLUDED