[AVFS] internal uzip.c broken for zips with many entries

Ubuntu 14.04 here, avfs == 1.0.1-2:amd64. The internal uzip.c handler
seems broken for zips with many files:

# hint: use a tmpfs working directory for faster tests
tst$ find . -delete
tst$ perl -wle 'for (1..50000) { mkdir "$_$_"; open (my $f, ">",
"$_$_/$_"); close $f; }'
tst$ mountavfs
ls ~/.avfs/tmp/x.zip#
ls: cannot access /home/user/.avfs/tmp/x.zip#: No such file or directory

A strace shows
30384 sendto(5, "<14>Jun  9 21:22:01 avfs[26671]: UZIP: Broken
archive", 53, MSG_NOSIGNAL, NULL, 0) = 53

With x.zip#ext-uzip (on Ubuntu) it works. Also, for fewer zip entries
(e.g. 1..10000) the internal handler works too

BTW, what is the performance impact of using the external handler? I
really need to transparently mount archives, and need an archive
format with a central entry table for fast random access (zip and rar
are the most obvious choices I guess).

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