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diff --git a/src/SftpNegotiationCommand.h b/src/SftpNegotiationCommand.h
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2015 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_SFTP_NEGOTIATION_COMMAND_H
+#define D_SFTP_NEGOTIATION_COMMAND_H
+
+#include "AbstractCommand.h"
+
+namespace aria2 {
+
+class SocketCore;
+class AuthConfig;
+
+class SftpNegotiationCommand : public AbstractCommand {
+public:
+  enum Seq {
+    SEQ_HANDSHAKE,
+    SEQ_AUTH_PASSWORD,
+    SEQ_SFTP_OPEN,
+    SEQ_SFTP_STAT,
+    SEQ_NEGOTIATION_COMPLETED,
+    SEQ_DOWNLOAD_ALREADY_COMPLETED,
+    SEQ_HEAD_OK,
+    SEQ_FILE_PREPARATION,
+    SEQ_EXIT,
+  };
+
+private:
+  void onFileSizeDetermined(int64_t totalLength);
+  void poolConnection() const;
+  void onDryRunFileFound();
+  std::string getPath() const;
+
+  std::shared_ptr<SocketCore> socket_;
+  Seq sequence_;
+  std::unique_ptr<AuthConfig> authConfig_;
+  // remote file path
+  std::string path_;
+
+protected:
+  virtual bool executeInternal() CXX11_OVERRIDE;
+
+public:
+  SftpNegotiationCommand(cuid_t cuid,
+                         const std::shared_ptr<Request>& req,
+                         const std::shared_ptr<FileEntry>& fileEntry,
+                         RequestGroup* requestGroup,
+                         DownloadEngine* e,
+                         const std::shared_ptr<SocketCore>& s,
+                         Seq seq = SEQ_HANDSHAKE);
+  virtual ~SftpNegotiationCommand();
+};
+
+} // namespace aria2
+
+#endif // D_SFTP_NEGOTIATION_COMMAND_H