On 32-bit systems, the non-sequential device could be pointing to a
device of 2 GB or more in size. If so, we should allow reading up to
the limit (2 GB - overhead), like we do for sequential devices in the
block above.
It could also happen on 64-bit systems, but the chance that you do have
a file bigger than 8 EB is remote.
[ChangeLog][QtCore][QIODevice] Changed readAll() handling of large
non-sequential devices like files that are bigger than the maximum
QByteArray size (on 32-bit systems, just under 2 GB). Previously,
readAll() always returned empty; now it will attempt to read from the
device.
Task-number: QTBUG-100546
Pick-to: 6.3
Change-Id: I74249c52dc02478ba93cfffd16d1a14ac92c77bb
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
b2a9646be9