Modified UTF16BEUTF8 to just convert the UTF-16 C-string into a std::u16string, and pass it into CodeToUTF8 with the 'from' parameter being "UTF-16BE", rather than manually performing the big endian to little endian encoding.

Source/Core/Common/StringUtil.cpp

@@ -570,9 +570,7 @@ std::string UTF16ToUTF8(const std::wstring& input)
 std::string UTF16BEToUTF8(const char16_t* str, size_t max_size)
 {
   const char16_t* str_end = std::find(str, str + max_size, '\0');
-  std::u16string result(static_cast<size_t>(str_end - str), '\0');
-  std::transform(str, str_end, result.begin(), static_cast<u16 (&)(u16)>(Common::swap16));
-  return CodeToUTF8("UTF-16LE", result);
+  return CodeToUTF8("UTF-16BE", std::u16string(str, static_cast<size_t>(str_end - str)));
 }
 
 #endif