Function gpgme_sys::gpgme_data_new_from_filepart

pub unsafe extern "C" fn gpgme_data_new_from_filepart(
    r_dh: *mut gpgme_data_t,
    fname: *const c_char,
    fp: *mut FILE,
    offset: off_t,
    length: size_t
) -> gpgme_error_t