DWORD off0 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_CURRENT);
DWORD off1 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_END);
if (off0 == off1)
DWORD off0 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_CURRENT);
DWORD off1 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_END);
if (off0 == off1)