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diff --git a/gr-fec/lib/async_encoder_impl.h b/gr-fec/lib/async_encoder_impl.h
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+++ b/gr-fec/lib/async_encoder_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2014 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_FEC_ASYNC_ENCODER_IMPL_H
+#define INCLUDED_FEC_ASYNC_ENCODER_IMPL_H
+
+#include <gnuradio/fec/async_encoder.h>
+#include <gnuradio/blocks/unpack_k_bits.h>
+#include <gnuradio/blocks/pack_k_bits.h>
+
+namespace gr {
+  namespace fec {
+
+    class FEC_API async_encoder_impl : public async_encoder
+    {
+    private:
+      generic_encoder::sptr d_encoder;
+      size_t d_input_item_size;
+      size_t d_output_item_size;
+
+      pmt::pmt_t d_in_port;
+      pmt::pmt_t d_out_port;
+
+      blocks::kernel::unpack_k_bits *d_unpack;
+      blocks::kernel::pack_k_bits   *d_pack;
+
+      bool d_packed;
+      bool d_rev_unpack;
+      bool d_rev_pack;
+
+      uint8_t* d_bits_in;
+      uint8_t* d_bits_out;
+
+      void encode_packed(pmt::pmt_t msg);
+      void encode_unpacked(pmt::pmt_t msg);
+
+    public:
+      async_encoder_impl(generic_encoder::sptr my_encoder,
+                         bool packed=false,
+                         bool rev_unpack=true, bool rev_pack=true);
+      ~async_encoder_impl();
+
+      int general_work(int noutput_items,
+                       gr_vector_int& ninput_items,
+                       gr_vector_const_void_star &input_items,
+                       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace fec */
+} /* namespace gr */
+
+#endif /* INCLUDED_FEC_ASYNC_ENCODER_IMPL_H */