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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_ENCODER_HPP_INCLUDED
+#define VMIME_ENCODER_HPP_INCLUDED
+
+
+#include "base.hpp"
+#include "propertySet.hpp"
+#include "exception.hpp"
+
+
+namespace vmime
+{
+
+
+class encoder
+{
+public:
+
+	encoder();
+	virtual ~encoder();
+
+	/** Encode data.
+	  *
+	  * @param in input data (decoded)
+	  * @param out output stream for encoded data
+	  * @return number of bytes written into output stream
+	  */
+	virtual const utility::stream::size_type encode(utility::inputStream& in, utility::outputStream& out) = 0;
+
+	/** Decode data.
+	  *
+	  * @param in input data (encoded)
+	  * @param out output stream for decoded data
+	  * @return number of bytes written into output stream
+	  */
+	virtual const utility::stream::size_type decode(utility::inputStream& in, utility::outputStream& out) = 0;
+
+	/** Return the properties of the encoder.
+	  *
+	  * @return properties of the encoder
+	  */
+	const propertySet& properties() const;
+
+	/** Return the properties of the encoder.
+	  *
+	  * @return properties of the encoder
+	  */
+	propertySet& properties();
+
+	/** Return a list of property names that can be set for
+	  * this encoder.
+	  *
+	  * @return list of property names
+	  */
+	virtual const std::vector <string> availableProperties() const;
+
+	/** Return the results returned by this encoder.
+	  *
+	  * @return results returned by the encoder
+	  */
+	const propertySet& results() const;
+
+protected:
+
+	propertySet& results();
+
+private:
+
+	propertySet m_props;
+	propertySet m_results;
+};
+
+
+} // vmime
+
+
+#endif // VMIME_ENCODER_HPP_INCLUDED