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diff --git a/src/core/function/CharsetOperator.h b/src/core/function/CharsetOperator.h
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+/**
+ * Copyright (C) 2021 Saturneric
+ *
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend 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.
+ *
+ * GpgFrontend 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 GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from
+ * the gpg4usb project, which is under GPL-3.0-or-later.
+ *
+ * All the source code of GpgFrontend was modified and released by
+ * Saturneric<[email protected]> starting on May 12, 2021.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#ifndef GPGFRONTEND_CHARSETDETECTOR_H
+#define GPGFRONTEND_CHARSETDETECTOR_H
+
+#include <string>
+
+#include "core/GpgFrontendCore.h"
+
+namespace GpgFrontend {
+
+class GPGFRONTEND_CORE_EXPORT CharsetOperator {
+ public:
+  using CharsetInfo = std::tuple<std::string, std::string, int>;
+
+  static CharsetInfo Detect(const std::string &buffer);
+
+  static bool Convert2Utf8(const std::string &buffer, std::string &out_buffer,
+                           std::string from_charset_name);
+};
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_CHARSETDETECTOR_H