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Alex Trotsenko 6e8fcab7e0 Improve QIODevice::peek() performance on buffered devices
Since 5.7, QIODevice::peek() implementation is based on transaction
mechanism. While technically it's correct, seeking backward on a
buffered random-access device clears the internal buffer that affects
the performance of reading.

To solve the problem, this patch implements peek mode directly inside
the reading procedure.

Task-number: QTBUG-56032
Change-Id: Ic5269f76e44c491a0309e13aba87fa7cf7b9259f
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
2017-02-09 18:46:24 +00:00
bin don't include injected headers into linker version script 2016-10-14 09:00:29 +00:00
config.tests Fix MIPS DSP configuration 2017-01-27 15:08:57 +00:00
dist Add changes file for 5.8.0 2017-01-02 06:50:47 +00:00
doc Doc: Ignore QML/JavaScript parsing errors 2017-02-07 08:34:39 +00:00
examples QXmlStream{Reader,Writer} don't need QtXml 2017-01-31 17:54:35 +00:00
lib Purge all fonts 2015-08-18 19:59:14 +00:00
mkspecs Remove out of date comments related to Xorg and GCC 2017-02-08 23:41:35 +00:00
qmake rename qvector.cpp => qvector.qdoc 2017-02-09 14:56:01 +00:00
src Improve QIODevice::peek() performance on buffered devices 2017-02-09 18:46:24 +00:00
tests Improve QIODevice::peek() performance on buffered devices 2017-02-09 18:46:24 +00:00
util Also release winmain, qopenglextensions under commercial licenses 2016-11-18 16:19:56 +00:00
.gitattributes Update the git-archive export options 2012-09-07 15:39:31 +02:00
.gitignore Update .gitignore 2017-01-18 10:58:02 +00:00
.qmake.conf Bump version 2017-01-03 13:25:46 +01:00
.tag Update the git-archive export options 2012-09-07 15:39:31 +02:00
config_help.txt Remove the -no-rtti option from configure 2017-01-26 07:44:39 +00:00
configure complain about various invalid configuration attempts 2017-01-06 20:10:10 +00:00
configure.bat reduce nesting in configure.bat 2017-01-10 12:44:21 +00:00
configure.json Remove outdated check for Apple Clang 2.x and 3.x 2017-02-08 05:28:01 +00:00
configure.pri Remove outdated check for Apple Clang 2.x and 3.x 2017-02-08 05:28:01 +00:00
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INSTALL Doc: Update links in INSTALL file 2015-02-16 09:06:41 +00:00
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qtbase.pro nuke configure -host-option 2016-12-13 18:55:59 +00:00
sync.profile Merge remote-tracking branch 'origin/5.7' into 5.8 2016-11-16 12:35:36 +01:00