Function libraw_open_bayer 

pub unsafe extern "C" fn libraw_open_bayer(
    lr: *mut libraw_data_t,
    data: *mut c_uchar,
    datalen: c_uint,
    _raw_width: ushort,
    _raw_height: ushort,
    _left_margin: ushort,
    _top_margin: ushort,
    _right_margin: ushort,
    _bottom_margin: ushort,
    procflags: c_uchar,
    bayer_battern: c_uchar,
    unused_bits: c_uint,
    otherflags: c_uint,
    black_level: c_uint,
) -> c_int