https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5802
--- Comment #35 from Guy Harris <guy@xxxxxxxxxxxx> 2011-04-09 18:22:49 PDT ---
I have a very large gzipped file that is cut short, so that in zlib_read(), in
the
/* fill output buffer up to end of deflate stream */
loop, it fails in the
if (state->avail_in == 0) {
test.
If I then scroll to the end of the packet list, it tries to go back and reread
some of the packets that it managed to read before getting an EOF; the attempts
to reread them fail in that test, even though it was able to read them in the
sequential pass.
When doing the sequential read, the calls to raw_read() are, with the offsets
into the compressed file at the time raw_read() is called being:
...
265203712
265207808
265211904
...
265515008
265519104
265523200
265527296
265531392
265535488
with the call at the last offset returning 0 bytes, causing an EOF while
inflating.
The random reads after that start with a fast seek to an offset of 265260508,
followed by raw_read() calls with offsets of:
265260508
265264604
265268700
265272796
...
265522652
265526748
265530844
265534940
with the call at the last offset returning 0 bytes, causing an EOF while
inflating.
It did several other raw_read() calls at the same offset, as it's trying to get
the contents of the other packets; they all got 0 bytes back.
The problem isn't that it's getting a premature EOF; the problem is that the
random reads are aborting with a premature EOF when they're trying to read
packets for which it *didn't* get a premature EOF in the sequential read pass.
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