K 10
svn:author
V 8
kientzle
K 8
svn:date
V 27
2007-10-27T22:45:40.000000Z
K 7
svn:log
V 495
When skipping input data, don't overflow a 32-bit size_t.
This can only happen on 32-bit systems when you're reading
an uncompressed archive and the skip request is an exact
multiple of 4G (e.g., skipping a tar entry with an 8G body).

The symptom is that the read_ahead() ends up returning zero
bytes, and the extraction stops with a premature end-of-file.

Using '1' here is more correct anyway, as it allows read_ahead()
to function opportunistically and minimize copying.

MFC after: 5 days

END