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diff --git a/src/StreamFilter.h b/src/StreamFilter.h
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 Tatsuhiro Tsujikawa
+ *
+ * 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 2 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
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef D_STREAM_FILTER_H
+#define D_STREAM_FILTER_H
+
+#include "common.h"
+#include <string>
+#include "SharedHandle.h"
+
+namespace aria2 {
+
+class BinaryStream;
+class Segment;
+
+// Interface for basic decoding functionality.
+class StreamFilter {
+private:
+  SharedHandle<StreamFilter> delegate_;
+public:
+  StreamFilter
+  (const SharedHandle<StreamFilter>& delegate = SharedHandle<StreamFilter>());
+
+  virtual ~StreamFilter() {}
+
+  // init() must be called before calling decode().
+  virtual void init() = 0;
+
+  virtual ssize_t transform(const SharedHandle<BinaryStream>& out,
+                            const SharedHandle<Segment>& segment,
+                            const unsigned char* inbuf, size_t inlen) = 0;
+
+  virtual bool finished() = 0;
+
+  // The call of release() will free allocated resources.
+  // After calling release(), the object can be reused by calling init().
+  virtual void release() = 0;
+
+  virtual const std::string& getName() const = 0;
+
+  virtual size_t getBytesProcessed() const = 0;
+
+  virtual bool installDelegate(const SharedHandle<StreamFilter>& filter);
+
+  SharedHandle<StreamFilter> getDelegate() const
+  {
+    return delegate_;
+  }
+};
+
+} // namespace aria2
+
+#endif // D_STREAM_FILTER_H