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diff --git a/src/i_decoder.hpp b/src/i_decoder.hpp
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+/*
+    Copyright (c) 2007-2012 iMatix Corporation
+    Copyright (c) 2007-2012 Other 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 i_msg_sink;
+
+    //  Interface to be implemented by message decoder.
+
+    struct i_decoder
+    {
+        virtual ~i_decoder () {}
+
+        virtual void set_msg_sink (i_msg_sink *msg_sink_) = 0;
+
+        virtual void get_buffer (unsigned char **data_, size_t *size_) = 0;
+
+        virtual size_t process_buffer (unsigned char *data_, size_t size_) = 0;
+
+        virtual bool stalled () = 0;
+
+    };
+
+}
+
+#endif