forked from osmocom/wireshark
Reduce the number of calls to tvb_reported_lenght_remaining().
Change-Id: I717572d403b38a33ccd5e390ace3742f3d296250 Reviewed-on: https://code.wireshark.org/review/1622 Reviewed-by: Anders Broman <a.broman58@gmail.com>
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@ -822,7 +822,7 @@ static dissector_table_t ext_hdr_subdissector_table;
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/* Forward declaration we need below */
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void proto_reg_handoff_sip(void);
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static gboolean dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo,
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static gboolean dissect_sip_common(tvbuff_t *tvb, int offset, int remaining_length, packet_info *pinfo,
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proto_tree *tree, gboolean is_heur, gboolean use_reassembly);
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static line_type_t sip_parse_line(tvbuff_t *tvb, int offset, gint linelen,
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guint *token_1_len);
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@ -2243,6 +2243,7 @@ dissect_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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guint8 octet;
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int len;
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int remaining_length;
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octet = tvb_get_guint8(tvb,0);
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if ((octet & 0xf8) == 0xf8){
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@ -2250,7 +2251,8 @@ dissect_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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return tvb_reported_length(tvb);
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}
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len = dissect_sip_common(tvb, 0, pinfo, tree, FALSE, FALSE);
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remaining_length = tvb_reported_length(tvb);
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len = dissect_sip_common(tvb, 0, remaining_length, pinfo, tree, FALSE, FALSE);
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if (len < 0)
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return 0; /* not SIP */
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else
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@ -2263,6 +2265,7 @@ dissect_sip_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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guint8 octet;
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int offset = 0;
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int len;
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int remaining_length;
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octet = tvb_get_guint8(tvb,0);
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if ((octet & 0xf8) == 0xf8){
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@ -2270,11 +2273,13 @@ dissect_sip_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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return;
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}
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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len = dissect_sip_common(tvb, offset, pinfo, tree, TRUE, TRUE);
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remaining_length = tvb_reported_length(tvb);
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while (remaining_length > 0) {
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len = dissect_sip_common(tvb, offset, remaining_length, pinfo, tree, TRUE, TRUE);
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if (len <= 0)
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break;
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offset += len;
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remaining_length = remaining_length - len;
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}
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}
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@ -2284,9 +2289,11 @@ dissect_sip_tcp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *
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int offset = 0;
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int len;
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gboolean first = TRUE;
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int remaining_length;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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len = dissect_sip_common(tvb, offset, pinfo, tree, !first, TRUE);
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remaining_length = tvb_reported_length(tvb);
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while (remaining_length > 0) {
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len = dissect_sip_common(tvb, offset, remaining_length, pinfo, tree, !first, TRUE);
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if (len == -2) {
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if (first) {
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/*
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@ -2301,6 +2308,7 @@ dissect_sip_tcp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *
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if (len == -1)
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break; /* need more data */
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offset += len;
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remaining_length = remaining_length - len;
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first = FALSE;
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}
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return TRUE;
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@ -2309,11 +2317,13 @@ dissect_sip_tcp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *
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static gboolean
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dissect_sip_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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return dissect_sip_common(tvb, 0, pinfo, tree, FALSE, FALSE) > 0;
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int remaining_length = tvb_reported_length(tvb);
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return dissect_sip_common(tvb, 0, remaining_length, pinfo, tree, FALSE, FALSE) > 0;
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}
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static int
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dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
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dissect_sip_common(tvbuff_t *tvb, int offset, int remaining_length, packet_info *pinfo, proto_tree *tree,
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gboolean dissect_other_as_continuation, gboolean use_reassembly)
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{
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int orig_offset;
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@ -2343,17 +2353,15 @@ dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tr
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guint request_for_response = 0;
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guint32 response_time = 0;
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int strlen_to_copy;
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int reported_length;
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/*
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* If this should be a request of response, do this quick check to see if
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* it begins with a string...
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* Otherwise, SIP heuristics are expensive...
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*
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*/
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reported_length = tvb_reported_length_remaining(tvb, offset);
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if (!dissect_other_as_continuation &&
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((reported_length < 1) || !g_ascii_isprint(tvb_get_guint8(tvb, offset))))
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((remaining_length < 1) || !g_ascii_isprint(tvb_get_guint8(tvb, offset))))
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{
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return -2;
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}
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@ -2367,7 +2375,7 @@ dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tr
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* "sip_parse_line()" won't throw an exception.
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*/
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orig_offset = offset;
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linelen = tvb_find_line_end(tvb, offset, reported_length, &next_offset, FALSE);
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linelen = tvb_find_line_end(tvb, offset, remaining_length, &next_offset, FALSE);
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if(linelen==0){
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return -2;
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}
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@ -2487,13 +2495,14 @@ dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tr
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/* XXX: Is adding to 'reqresp_tree as intended ? Changed from original 'sip_tree' */
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proto_tree_add_text(reqresp_tree, tvb, offset, -1, "Continuation data");
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}
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return reported_length;
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return remaining_length;
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}
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remaining_length = remaining_length - (next_offset - offset);
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offset = next_offset;
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if (sip_tree) {
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th = proto_tree_add_item(sip_tree, hf_sip_msg_hdr, tvb, offset,
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tvb_reported_length_remaining(tvb, offset), ENC_UTF_8|ENC_NA);
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remaining_length, ENC_UTF_8|ENC_NA);
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proto_item_set_text(th, "Message Header");
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hdr_tree = proto_item_add_subtree(th, ett_sip_hdr);
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}
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@ -2505,7 +2514,7 @@ dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tr
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*/
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next_offset = offset;
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content_length = -1;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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while (remaining_length > 0) {
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gint line_end_offset;
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gint colon_offset;
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gint semi_colon_offset;
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@ -3369,6 +3378,7 @@ dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tr
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proto_tree_add_expert(hdr_tree, pinfo, &ei_sip_header_not_terminated,
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tvb, line_end_offset, -1);
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}
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remaining_length = remaining_length - (next_offset - offset);
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offset = next_offset;
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}/* End while */
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