Fixed compatibility with old GnuTLS versions

src/microhttpd/connection_https.c

@@ -91,8 +91,13 @@ recv_tls_adapter (struct MHD_Connection *connection,
          (GNUTLS_E_CRYPTODEV_IOCTL_ERROR == res) ||
          (GNUTLS_E_CRYPTODEV_DEVICE_ERROR == res) )
       return MHD_ERR_PIPE_;
+#if defined(GNUTLS_E_PREMATURE_TERMINATION)
     if (GNUTLS_E_PREMATURE_TERMINATION == res)
       return MHD_ERR_CONNRESET_;
+#elif defined(GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
+    if (GNUTLS_E_UNEXPECTED_PACKET_LENGTH == res)
+      return MHD_ERR_CONNRESET_;
+#endif /* GNUTLS_E_UNEXPECTED_PACKET_LENGTH */
     if (GNUTLS_E_MEMORY_ERROR == res)
       return MHD_ERR_NOMEM_;
     /* Treat any other error as a hard error. */

src/microhttpd/daemon.c

@@ -2317,8 +2317,10 @@ psk_gnutls_adapter (gnutls_session_t session,
 {
   struct MHD_Connection *connection;
   struct MHD_Daemon *daemon;
+#if GNUTLS_VERSION_MAJOR >= 3
   void *app_psk;
   size_t app_psk_size;
+#endif /* GNUTLS_VERSION_MAJOR >= 3 */
 
   connection = gnutls_session_get_ptr (session);
   if (NULL == connection)
@@ -2371,6 +2373,7 @@ psk_gnutls_adapter (gnutls_session_t session,
   free (app_psk);
   return 0;
 #else
+  (void) username; (void) key; /* Mute compiler warning */
 #ifdef HAVE_MESSAGES
   MHD_DLOG (daemon,
             _ ("PSK not supported by this server.\n"));

src/microhttpd/mhd_send.c

@@ -799,8 +799,13 @@ MHD_send_data_ (struct MHD_Connection *connection,
          (GNUTLS_E_CRYPTODEV_IOCTL_ERROR == ret) ||
          (GNUTLS_E_CRYPTODEV_DEVICE_ERROR == ret) )
       return MHD_ERR_PIPE_;
+#if defined(GNUTLS_E_PREMATURE_TERMINATION)
     if (GNUTLS_E_PREMATURE_TERMINATION == ret)
       return MHD_ERR_CONNRESET_;
+#elif defined(GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
+    if (GNUTLS_E_UNEXPECTED_PACKET_LENGTH == ret)
+      return MHD_ERR_CONNRESET_;
+#endif /* GNUTLS_E_UNEXPECTED_PACKET_LENGTH */
     if (GNUTLS_E_MEMORY_ERROR == ret)
       return MHD_ERR_NOMEM_;
     if (ret < 0)