RMG-Core: introduce & use ConvertStringEncoding

Source/RMG-Core/ConvertStringEncoding.hpp

@@ -0,0 +1,27 @@
+/*
+ * Rosalie's Mupen GUI - https://github.com/Rosalie241/RMG
+ *  Copyright (C) 2020 Rosalie Wanders <rosalie@mailbox.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 3.
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef CORE_CONVERTSTRINGENCODING_HPP
+#define CORE_CONVERTSTRINGENCODING_HPP
+#ifdef CORE_INTERNAL
+
+#include <string>
+
+enum class CoreStringEncoding : int
+{
+    EUC_JP = 0,
+    Shift_JIS = 1
+};
+
+// attempts to convert the string (which uses encoding) to UTF-8,
+// on failure, returns original string
+std::string CoreConvertStringEncoding(std::string str, CoreStringEncoding encoding);
+
+#endif // CORE_INTERNAL
+#endif // CORE_CONVERTSTRINGENCODING_HPP