@param Utf8Char Return VT-UTF8 character set.\r
@param ValidBytes The count of valid VT-UTF8 characters. If\r
ValidBytes is zero, no valid VT-UTF8 returned.\r
@param Utf8Char Return VT-UTF8 character set.\r
@param ValidBytes The count of valid VT-UTF8 characters. If\r
ValidBytes is zero, no valid VT-UTF8 returned.\r