Function mpg123_sys::mpg123_replace_reader

pub unsafe extern fn mpg123_replace_reader(mh: *mut mpg123_handle,
                                           r_read: unsafe extern fn(_: c_int, _: *mut c_void, _: size_t) -> ssize_t,
                                           r_lseek: unsafe extern fn(_: c_int, _: off_t, _: c_int) -> off_t)
                                           -> c_int