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Decompress QResources only when needed.

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In particular, just creating a QFileInfo (or a QDirIterator, which uses
QFileInfo internally) no longer triggers decompression. This doubles the
performance when using a QDirIterator/QFile combo for loading a bunch of
files.

Change-Id: I7f53354e890ad6360693b7848d21a0cd5d595628
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Volker Krause 2016-04-24 15:22:49 +02:00
parent 249cb94655
commit 5e059c6047
1 changed files with 18 additions and 9 deletions
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27
src/corelib/io/qresource.cpp
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@ -1194,9 +1194,10 @@ protected:
private:
uchar *map(qint64 offset, qint64 size, QFile::MemoryMapFlags flags);
bool unmap(uchar *ptr);
void uncompress() const;
qint64 offset;
QResource resource;
QByteArray uncompressed;
mutable QByteArray uncompressed;
protected:
QResourceFileEnginePrivate() : offset(0) { }
};
@ -1231,13 +1232,6 @@ QResourceFileEngine::QResourceFileEngine(const QString &file) :
{
Q_D(QResourceFileEngine);
d->resource.setFileName(file);
if(d->resource.isCompressed() && d->resource.size()) {
#ifndef QT_NO_COMPRESS
d->uncompressed = qUncompress(d->resource.data(), d->resource.size());
#else
Q_ASSERT(!"QResourceFileEngine::open: Qt built without support for compression");
#endif
}
}
QResourceFileEngine::~QResourceFileEngine()
@ -1259,6 +1253,7 @@ bool QResourceFileEngine::open(QIODevice::OpenMode flags)
}
if(flags & QIODevice::WriteOnly)
return false;
d->uncompress();
if (!d->resource.isValid()) {
d->errorString = qt_error_string(ENOENT);
return false;
@ -1324,8 +1319,10 @@ qint64 QResourceFileEngine::size() const
Q_D(const QResourceFileEngine);
if(!d->resource.isValid())
return 0;
if(d->resource.isCompressed())
if (d->resource.isCompressed()) {
d->uncompress();
return d->uncompressed.size();
}
return d->resource.size();
}
@ -1493,6 +1490,18 @@ bool QResourceFileEnginePrivate::unmap(uchar *ptr)
Q_UNUSED(ptr);
return true;
}
void QResourceFileEnginePrivate::uncompress() const
{
if (resource.isCompressed() && uncompressed.isEmpty() && resource.size()) {
#ifndef QT_NO_COMPRESS
uncompressed = qUncompress(resource.data(), resource.size());
#else
Q_ASSERT(!"QResourceFileEngine::open: Qt built without support for compression");
#endif
}
}
#endif // !defined(QT_BOOTSTRAPPED)
QT_END_NAMESPACE