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diff --git a/gr-trellis/lib/permutation_impl.h b/gr-trellis/lib/permutation_impl.h
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+++ b/gr-trellis/lib/permutation_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2012 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_TRELLIS_PERMUTATION_IMPL_H
+#define INCLUDED_TRELLIS_PERMUTATION_IMPL_H
+
+#include <trellis/api.h>
+#include <trellis/permutation.h>
+
+namespace gr {
+  namespace trellis {
+
+    class permutation_impl : public permutation
+    {
+    private:
+      int d_K;
+      std::vector<int> d_TABLE;
+      int d_SYMS_PER_BLOCK;
+      size_t d_BYTES_PER_SYMBOL;
+
+    public:
+      permutation_impl(int K, const std::vector<int> &TABLE,
+		  int SYMS_PER_BLOCK, size_t NBYTES);
+      ~permutation_impl();
+
+      int K() const { return d_K; }
+      const std::vector<int> & TABLE() const { return d_TABLE; }
+      int SYMS_PER_BLOCK() const { return d_SYMS_PER_BLOCK; }
+      size_t BYTES_PER_SYMBOL() const { return d_BYTES_PER_SYMBOL; }
+
+      int work(int noutput_items,
+	       gr_vector_const_void_star &input_items,
+	       gr_vector_void_star &output_items);
+    };
+
+  } /* namespace trellis */
+} /* namespace gr */
+
+#endif /* INCLUDED_TRELLIS_PERMUTATION_IMPL_H */