func NewDataReader(r io.Reader) (*Data, error) {
	d := newData()
	d.r = r
	d.cbs.read = C.gpgme_data_read_cb_t(C.gogpgme_readfunc)
	cbc := callbackAdd(d)
	d.cbc = cbc
	return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
func NewDataReader(r io.Reader) (*Data, error) {
	d := newData()
	d.r = r
	d.cbs.read = C.gpgme_data_read_cb_t(C.gogpgme_readfunc)
	cbc := callbackAdd(d)
	d.cbc = cbc
	return d, handleError(C.gogpgme_data_new_from_cbs(&d.dh, &d.cbs, C.uintptr_t(cbc)))
}
func NewDataReader ( r io . Reader ) ( * Data , error ) { d := newData ( ) d . r = r d . cbs . read = C . gpgme_data_read_cb_t ( C . gogpgme_readfunc ) cbc := callbackAdd ( d ) d . cbc = cbc return d , handleError ( C . gogpgme_data_new_from_cbs ( & d . dh , & d . cbs , C . uintptr_t ( cbc ) ) ) }
// NewDataReader returns a new callback based data buffer
NewDataReader returns a new callback based data buffer