coap_opt_t *
coap_option_next(coap_opt_iterator_t *oi) {
assert(oi);
if (opt_finished(oi))
return NULL;
/* proceed to next option */
if (oi->n++) {
oi->option = options_next(oi->option);
oi->type += COAP_OPT_DELTA(oi->option);
}
/* Skip subsequent options if it is an empty no-op (used for
* fence-posting) or the filter bit is not set. */
while (!opt_finished(oi) &&
(IS_EMPTY_NOOP(oi->type, oi->option)
|| coap_option_getb(oi->filter, oi->type) == 0)) {
oi->n++;
oi->option = options_next(oi->option);
if (opt_finished(oi))
break;
oi->type += COAP_OPT_DELTA(oi->option);
}
return opt_finished(oi) ? NULL : oi->option;
}
coap_opt_iterator_t *
coap_option_iterator_init(coap_pdu_t *pdu, coap_opt_iterator_t *oi,
const coap_opt_filter_t filter) {
assert(pdu); assert(oi);
memset(oi, 0, sizeof(coap_opt_iterator_t));
if (pdu->hdr->optcnt) {
oi->optcnt = pdu->hdr->optcnt;
oi->option = options_start(pdu);
oi->type = COAP_OPT_DELTA(oi->option);
memcpy(oi->filter, filter, sizeof(coap_opt_filter_t));
return oi;
}
return NULL;
}
void
for_each_option(coap_pdu_t *pdu,
void (*f)(coap_opt_t *, unsigned char, unsigned int, const unsigned char *) ) {
unsigned char cnt;
coap_opt_t *opt;
unsigned char opt_code = 0;
if (! pdu )
return;
opt = options_start( pdu );
for ( cnt = pdu->hdr->optcnt; cnt; --cnt ) {
opt_code += COAP_OPT_DELTA(*opt);
f ( opt, opt_code, COAP_OPT_LENGTH(*opt), COAP_OPT_VALUE(*opt) );
opt = (coap_opt_t *)( (unsigned char *)opt + COAP_OPT_SIZE(*opt) );
}
}
