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diff --git a/src/i_decoder.hpp b/src/i_decoder.hpp
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+/*
+    Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_I_DECODER_HPP_INCLUDED__
+#define __ZMQ_I_DECODER_HPP_INCLUDED__
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    class msg_t;
+
+    //  Interface to be implemented by message decoder.
+
+    class i_decoder
+    {
+    public:
+        virtual ~i_decoder () {}
+
+        virtual void get_buffer (unsigned char **data_, size_t *size_) = 0;
+
+        //  Decodes data pointed to by data_.
+        //  When a message is decoded, 1 is returned.
+        //  When the decoder needs more data, 0 is returnd.
+        //  On error, -1 is returned and errno is set accordingly.
+        virtual int decode (const unsigned char *data_, size_t size_,
+                            size_t &processed) = 0;
+
+        virtual msg_t *msg () = 0;
+    };
+
+}
+
+#endif