+ // get current file length
+ wxFileOffset Length() const { return m_file.Length(); }
+ // move ptr ofs bytes related to start/current offset/end of file
+ wxFileOffset Seek(wxFileOffset ofs, wxSeekMode mode = wxFromStart)
+ { return m_file.Seek(ofs, mode); }
+ // get current offset
+ wxFileOffset Tell() const { return m_file.Tell(); }