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diff --git a/src/SHA1IOFile.h b/src/SHA1IOFile.h
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+++ b/src/SHA1IOFile.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_SHA1_IO_FILE_H
+#define D_SHA1_IO_FILE_H
+
+#include "IOFile.h"
+#include "MessageDigest.h"
+
+#include <memory>
+
+namespace aria2 {
+
+// Class to calculate SHA1 hash value for data written into this
+// object.  No file I/O is done in this class.
+class SHA1IOFile : public IOFile {
+public:
+  SHA1IOFile();
+
+  std::string digest();
+
+protected:
+  // Not implemented
+  virtual size_t onRead(void* ptr, size_t count) CXX11_OVERRIDE;
+  virtual size_t onWrite(const void* ptr, size_t count) CXX11_OVERRIDE;
+  // Not implemented
+  virtual char* onGets(char* s, int size) CXX11_OVERRIDE;
+  virtual int onVprintf(const char* format, va_list va) CXX11_OVERRIDE;
+  virtual int onFlush() CXX11_OVERRIDE;
+  virtual int onClose() CXX11_OVERRIDE;
+  virtual bool onSupportsColor() CXX11_OVERRIDE;
+  virtual bool isError() const CXX11_OVERRIDE;
+  virtual bool isEOF() const CXX11_OVERRIDE;
+  virtual bool isOpen() const CXX11_OVERRIDE;
+
+private:
+  std::unique_ptr<MessageDigest> sha1_;
+};
+} // namespace aria2
+
+#endif // D_SHA1_IO_FILE_H