Jeff Morriss skrev 2011-09-27 21:56:
Anders Broman wrote:
Anders Broman skrev 2011-09-26 18:25:
Stig Bj�rlykke skrev 2011-09-26 18:14:
On Mon, Sep 26, 2011 at 4:51 PM,<etxrab@xxxxxxxxxxxxx> wrote:
Log:
Get rid of check_col, while at it set ENC.
Directory: /trunk/epan/dissectors/
Changes Path Action
+35 -37 packet-dmp.c Modified
The remaining check_col in packet-dmp.c was left on purpose, because
we do not need this calculations if not having COL_INFO.
Should we really remove all occurrences of check_col?
Perhaps not, but how often isn't the info column present?
Thinking about it this raises the question
- is check_col deprecated or not?
Should lengthy code to compute column info be protected in some other
manner?
fd->visited? (!tree)? We only fill in the column info on the first
pass before the tree is built, right?
Actually a quick test indicates that we only build the column info on
the 2nd pass (for those frames which are currently displayed).
In other words, if you've got 10,000 frames of which 25 are displayed
in your Wireshark window, your dissector is called 10,000 times with
check_col(COL_INFO)==0 and 25 times with check_col(COL_INFO)==1. As
you scroll down the dissector is called again for the newly-visible
frames with check_col(COL_INFO)==1. (It does appear that Wireshark
does cache the column information; scrolling back or clicking on
earlier packets does not result in the column info being rebuilt, even
if the dissector is called again.)
Actually another case when column info won't be present is tshark when
doing statistics, etc., but not printing the packet details.
This suggests that check_col()'s should be left in--at least if they
are protecting us from doing some work, including val_to_str()'s.
Even though the check_col is built into the function calls them self s?
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