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diff --git a/lib/common_impl.hpp b/lib/common_impl.hpp
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+//
+// Copyright 2012 Josh Blum
+//
+// This program 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.
+//
+// This program 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 io_sig program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef INCLUDED_LIBGNURADIO_COMMON_IMPL_HPP
+#define INCLUDED_LIBGNURADIO_COMMON_IMPL_HPP
+
+#include <tsbe/buffer.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/dynamic_bitset.hpp>
+#include <vector>
+#include <iostream>
+
+#define HERE() std::cerr << __FILE__ << ":" << __LINE__ << std::endl << std::flush;
+#define VAR(x) std::cerr << #x << " = " << (x) << std::endl << std::flush;
+#define ASSERT(x) if(not (x)){HERE(); std::cerr << "assert failed: " << #x << std::endl << std::flush;}
+
+static inline unsigned long myulround(const double x)
+{
+    return (unsigned long)(x + 0.5);
+}
+
+static inline unsigned long long myullround(const double x)
+{
+    return (unsigned long long)(x + 0.5);
+}
+
+namespace gnuradio
+{
+
+typedef boost::dynamic_bitset<> BitSet;
+
+struct Token : boost::shared_ptr<int>
+{
+    static Token make(void)
+    {
+        Token tok;
+        tok.reset(new int(0));
+        return tok;
+    }
+};
+
+struct TopBlockMessage
+{
+    enum
+    {
+        ACTIVE,
+        INERT,
+        HINT,
+    } what;
+    size_t hint;
+    Token token;
+};
+
+struct CheckTokensMessage
+{
+    //empty
+};
+
+struct BufferReturnMessage
+{
+    size_t index;
+    tsbe::Buffer buffer;
+};
+
+} //namespace gnuradio
+
+#endif /*INCLUDED_LIBGNURADIO_COMMON_IMPL_HPP*/