coap_pdu_t *
coap_pdu_init(unsigned char type, unsigned char code,
unsigned short id, size_t size) {
coap_pdu_t *pdu;
#ifdef WITH_LWIP
struct pbuf *p;
#endif
assert(size <= COAP_MAX_PDU_SIZE);
/* Size must be large enough to fit the header. */
if (size < sizeof(coap_hdr_t) || size > COAP_MAX_PDU_SIZE)
return NULL;
/* size must be large enough for hdr */
#if defined(WITH_POSIX) || defined(WITH_CONTIKI)
pdu = coap_malloc_type(COAP_PDU, sizeof(coap_pdu_t));
if (!pdu) return NULL;
pdu->hdr = coap_malloc_type(COAP_PDU_BUF, size);
if (pdu->hdr == NULL) {
coap_free_type(COAP_PDU, pdu);
pdu = NULL;
}
#endif /* WITH_POSIX or WITH_CONTIKI */
#ifdef WITH_LWIP
pdu = (coap_pdu_t*)coap_malloc_type(COAP_PDU, sizeof(coap_pdu_t));
if (!pdu) return NULL;
p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);
if (p == NULL) {
coap_free_type(COAP_PDU, pdu);
pdu = NULL;
}
#endif
if (pdu) {
#ifdef WITH_LWIP
pdu->pbuf = p;
#endif
coap_pdu_clear(pdu, size);
pdu->hdr->id = id;
pdu->hdr->type = type;
pdu->hdr->code = code;
}
return pdu;
}
void
coap_delete_pdu(coap_pdu_t *pdu) {
#if defined(WITH_POSIX) || defined(WITH_CONTIKI)
if (pdu != NULL) {
if (pdu->hdr != NULL) {
coap_free_type(COAP_PDU_BUF, pdu->hdr);
}
coap_free_type(COAP_PDU, pdu);
}
#endif
#ifdef WITH_LWIP
if (pdu != NULL) /* accepting double free as the other implementation accept that too */
pbuf_free(pdu->pbuf);
coap_free_type(COAP_PDU, pdu);
#endif
}
