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FileUtil: Add a class for Exists/IsDirectory/GetSize

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Some code was calling more than one of these functions in a row
(in particular, FileUtil.cpp itself did it a lot...), which is
a waste since it's possible to call stat a single time and then
read all three values from the stat struct. This commit adds a
File::FileInfo class that calls stat once on construction and
then lets Exists/IsDirectory/GetSize be executed very quickly.

The performance improvement mostly matters for functions that
can be handling a lot of files, such as File::ScanDirectoryTree.

I've also done some cleanup in code that uses these functions.
For instance, some code had checks like !Exists() || !IsDirectory(),
which is functionally equivalent to !IsDirectory(), and some
code was using File::GetSize even though there was an IOFile
object that the code could call GetSize on.
This commit is contained in:
JosJuice 2017-06-29 11:20:38 +02:00
commit 5ca3aee00a
21 changed files with 175 additions and 177 deletions
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3
Source/Core/Common/SysConf.cpp
View file

@ -56,8 +56,7 @@ void SysConf::Load()
{
Clear();
if (!File::Exists(m_file_name) || File::GetSize(m_file_name) != SYSCONF_SIZE ||
!LoadFromFile(m_file_name))
if (File::GetSize(m_file_name) != SYSCONF_SIZE || !LoadFromFile(m_file_name))
{
WARN_LOG(CORE, "No valid SYSCONF detected. Creating a new one.");
InsertDefaultEntries();