der_get_length
ret = der_get_length (buf, len, &length, &sz);
(generic_decode)der_get_length);
der_get_length (
e = der_get_length (p, len, &datalen, &l);
e = der_get_length (p, len, length_ret, &l);
e = der_get_length(p + l, len - l, &length, &len_len);
e = der_get_length (p, total_len - 1, &len, &len_len);
e = der_get_length (p, total_len - 1 - len_len - 1,