// NewDataWriter returns a new callback based data buffer
func NewDataWriter(w io.Writer) (*Data, error) {
d := newData()
d.w = w
d.cbs.write = C.gpgme_data_write_cb_t(C.gogpgme_writefunc)
cbc := callbackAdd(d)
d.cbc = cbc
return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
// NewDataReadWriteSeeker returns a new callback based data buffer
func NewDataReadWriteSeeker(rw io.ReadWriteSeeker) (*Data, error) {
d := newData()
d.r = rw
d.w = rw
d.s = rw
d.cbs.read = C.gpgme_data_read_cb_t(C.gogpgme_readfunc)
d.cbs.write = C.gpgme_data_write_cb_t(C.gogpgme_writefunc)
d.cbs.seek = C.gpgme_data_seek_cb_t(C.gogpgme_seekfunc)
cbc := callbackAdd(d)
d.cbc = cbc
return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}