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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>
This commit is contained in:
AndersBroman 2014-05-13 10:28:09 +02:00 committed by Anders Broman
parent f9647404e3
commit cd8188ddb8
1 changed files with 25 additions and 15 deletions
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40
epan/dissectors/packet-sip.c
View File

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