diff --git a/tools/dissect/dissector.hpp b/tools/dissect/dissector.hpp
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+++ b/tools/dissect/dissector.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2021,  Regents of the University of California.
+ *
+ * This file is part of ndn-tools (Named Data Networking Essential Tools).
+ * See AUTHORS.md for complete list of ndn-tools authors and contributors.
+ *
+ * ndn-tools 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 of the License, or (at your option) any later version.
+ *
+ * ndn-tools 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
+ * ndn-tools, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NDN_TOOLS_DISSECT_DISSECTOR_HPP
+#define NDN_TOOLS_DISSECT_DISSECTOR_HPP
+
+#include "core/common.hpp"
+
+#include <ndn-cxx/encoding/block.hpp>
+
+namespace ndn {
+namespace dissect {
+
+struct Options
+{
+  bool dissectContent = false;
+};
+
+class Dissector : noncopyable
+{
+public:
+  Dissector(std::istream& input, std::ostream& output, const Options& options);
+
+  void
+  dissect();
+
+private:
+  void
+  printBranches();
+
+  void
+  printType(uint32_t type);
+
+  void
+  printBlock(const Block& block);
+
+private:
+  const Options& m_options;
+  std::istream& m_in;
+  std::ostream& m_out;
+
+  // m_branches[i] is true iff the i-th level of the tree has more branches after the current one
+  std::vector<bool> m_branches;
+};
+
+} // namespace dissect
+} // namespace ndn
+
+#endif // NDN_TOOLS_DISSECT_DISSECTOR_HPP