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diff --git a/src/StructParserStateMachine.h b/src/StructParserStateMachine.h
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2012 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_STRUCT_PARSER_STATE_MACHINE_H
+#define D_STRUCT_PARSER_STATE_MACHINE_H
+
+#include "common.h"
+
+namespace aria2 {
+
+enum StructElementType {
+  STRUCT_DICT_T,
+  STRUCT_DICT_KEY_T,
+  STRUCT_DICT_DATA_T,
+  STRUCT_ARRAY_T,
+  STRUCT_ARRAY_DATA_T,
+  STRUCT_STRING_T,
+  STRUCT_NUMBER_T,
+  STRUCT_BOOL_T,
+  STRUCT_NULL_T
+};
+
+// Interface for streaming parser of structured data format (e.g.,
+// JSON, Bencode).
+class StructParserStateMachine {
+public:
+  virtual ~StructParserStateMachine() {}
+
+  virtual void beginElement(int elementType) = 0;
+  virtual void endElement(int elementType) = 0;
+  virtual void reset() = 0;
+  virtual void charactersCallback(const char* data, size_t len) = 0;
+  virtual void numberCallback(int64_t number, int frac, int exp) = 0;
+  virtual void boolCallback(bool bval) = 0;
+};
+
+} //  namespace aria2
+
+#endif // D_STRUCT_PARSER_STATE_MACHINE_H