Function PEM_bytes_read_bio 

pub unsafe extern "C" fn PEM_bytes_read_bio(
    out_data: *mut *mut u8,
    out_len: *mut c_long,
    out_name: *mut *mut c_char,
    expected_name: *const c_char,
    bio: *mut BIO,
    cb: pem_password_cb,
    userdata: *mut c_void,
) -> c_int