Avoid continually shuffling large output buffers down in memory,
it kills CPU caches, does nothing useful, and we can just advance
an offset instead. Of course, we do need to free memory - so do
that for lots of common cases.
Change-Id: I63240661ca87bdc0574acbce856771d9dde3fa94
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>
For large transfers eg. image previews, particularly with SSL's
protocol limit of 16k byte blocks, we see lots of inefficiency
repeatedly copying a 20Mb image and shuffling it down a
std::vector as we write data out.
Change-Id: I620568cad2e6f41684c35289b0ee77cf7f59c077
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>
