Wireshark-bugs: [Wireshark-bugs] [Bug 5109] Moving backwards in compressed captures is extremely
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5109
Guy Harris <guy@xxxxxxxxxxxx> changed:
What |Removed |Added
----------------------------------------------------------------------------
Platform|x86 |All
Summary|Backward searches (Find |Moving backwards in
|Previous, Find>Up) in |compressed captures is
|compressed captures is |extremely slow
|extremely slow |
OS/Version|Windows XP |All
--- Comment #1 from Guy Harris <guy@xxxxxxxxxxxx> 2010-08-12 15:17:40 PDT ---
We're currently using the I/O routines in zlib to read compressed captures;
seeking forward in a compressed file is implemented by reading forward in the
file, and seeking backward in the file is implemented by going back to the
beginning of the file and reading forward. This is not a recipe for fast
backward seeks....
Fixing that should be doable, but involves checkpointing the compression
information at various points in the file. The zlib source comes with some
sample code for this, which I've worked on to try to use it. It's not a quick
fix, so this is probably going to remain a problem until some unknown point in
the 1.5 development cycle.
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