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diff --git a/src/NullDecompressor.hpp b/src/NullDecompressor.hpp
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+// Copyright (C) 2019 Joel Rosdahl and other contributors
+//
+// See doc/AUTHORS.adoc for a complete list of contributors.
+//
+// This program 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.
+//
+// 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 General Public License for
+// more details.
+//
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the Free Software Foundation, Inc., 51
+// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+#pragma once
+
+#include "Decompressor.hpp"
+#include "NonCopyable.hpp"
+
+// A decompressor of an uncompressed stream.
+class NullDecompressor : public Decompressor, NonCopyable
+{
+public:
+  // Parameters:
+  // - stream: The file to read data from.
+  explicit NullDecompressor(FILE* stream);
+
+  void read(void* data, size_t count) override;
+  void finalize() override;
+
+private:
+  FILE* m_stream;
+};