Add a read position variable to eliminate excessive memcpy'ing when
reading a partial buffer.
Specifically, fix performance issue of reading large files from
QNetworkDiskCache in QtWebKit2.
Task-number: QTBUG-27522
Change-Id: I21edc909bf9223971b2c3db5f1fa6b89c5b61c5f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Antti Harju <antti.harju@ixonos.com>
This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:
http://qt.gitorious.org/qt/pages/GitIntroductionWithQt
If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.
Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
