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diff --git a/gr-blocks/lib/packed_to_unpacked_impl.h b/gr-blocks/lib/packed_to_unpacked_impl.h
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+++ b/gr-blocks/lib/packed_to_unpacked_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006,2013,2018 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 PACKED_TO_UNPACKED_IMPL_H
+#define PACKED_TO_UNPACKED_IMPL_H
+
+#include <gnuradio/blocks/packed_to_unpacked.h>
+#include <gnuradio/blocks/log2_const.h>
+
+namespace gr {
+  namespace blocks {
+
+template<class T>
+    class packed_to_unpacked_impl : public  packed_to_unpacked<T>
+    {
+    private:
+      unsigned int    d_bits_per_chunk;
+      endianness_t d_endianness;
+      unsigned int    d_index;
+      const unsigned int d_bits_per_type = sizeof(T) * 8;
+      const unsigned int d_log2_l_type = log2_const<sizeof(T) * 8>();
+      unsigned int get_bit_le(const T *in_vector, unsigned int bit_addr);
+      unsigned int get_bit_be(const T *in_vector, unsigned int bit_addr);
+
+    public:
+      packed_to_unpacked_impl (unsigned int bits_per_chunk,
+                  endianness_t endianness);
+      ~packed_to_unpacked_impl ();
+
+      void forecast(int noutput_items,
+                    gr_vector_int &ninput_items_required);
+      int general_work(int noutput_items,
+                       gr_vector_int &ninput_items,
+                       gr_vector_const_void_star &input_items,
+                       gr_vector_void_star &output_items);
+
+      bool check_topology(int ninputs, int noutputs)
+      { return ninputs == noutputs; }
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* PACKED_TO_UNPACKED_IMPL_H */