private static int Get_imap_idx(Bry_err_wkr err_wkr, Gfh_tag img_tag) { byte[] val = img_tag.Atrs__get_as_bry(Imap_xtn_mgr.Bry__usemap__name); if (Bry_.Len_eq_0(val)) return -1; int rv = Bry_.To_int_or(val, Imap_xtn_mgr.Bry__usemap__prefix.length, val.length, -1); if (rv == -1) { err_wkr.Warn("invalid imap_idx", "val", val); return rv; } return rv; }