coap_session.c: Use existing constants for L4-specific header sizes

obgm · Sep 17, 2024 · 0814fe0 · 0814fe0
1 parent fde7193
commit 0814fe0
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/src/coap_session.c b/src/coap_session.c
@@ -604,10 +604,14 @@ coap_session_max_pdu_size_internal(const coap_session_t *session,
                                    size_t max_with_header) {
 #if COAP_DISABLE_TCP
   (void)session;
-  return max_with_header > 4 ? max_with_header - 4 : 0;
+  return max_with_header > COAP_PDU_MAX_UDP_HEADER_SIZE
+         ? max_with_header - COAP_PDU_MAX_UDP_HEADER_SIZE
+         : 0;
 #else /* !COAP_DISABLE_TCP */
   if (COAP_PROTO_NOT_RELIABLE(session->proto))
-    return max_with_header > 4 ? max_with_header - 4 : 0;
+    return max_with_header > COAP_PDU_MAX_UDP_HEADER_SIZE
+           ? max_with_header - COAP_PDU_MAX_UDP_HEADER_SIZE
+           : 0;
   /* we must assume there is no token to be on the safe side */
   if (max_with_header <= 2)
     return 0;
@@ -618,7 +622,7 @@ coap_session_max_pdu_size_internal(const coap_session_t *session,
   else if (max_with_header <= COAP_MAX_MESSAGE_SIZE_TCP16 + 4)
     return max_with_header - 4;
   else
-    return max_with_header - 6;
+    return max_with_header - COAP_PDU_MAX_TCP_HEADER_SIZE;
 #endif /* !COAP_DISABLE_TCP */
 }