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QImageReader: Pass up information about resource errors on open

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If a system runs out of FDs, there is no sense in trying to autodetect
the format - as the real problem is the lack of FDs, not the
non-existent file.

Change-Id: I3302340859c3cc62995ac1b7b3c7b6e6326cb43e
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
This commit is contained in:
Robin Burchell 2017-03-15 17:49:20 +01:00
parent 108956b53e
commit 66e162e8f1
1 changed files with 10 additions and 1 deletions
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11
src/gui/image/qimagereader.cpp
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@ -564,6 +564,16 @@ bool QImageReaderPrivate::initHandler()
// probe the file extension
if (deleteDevice && !device->isOpen() && !device->open(QIODevice::ReadOnly) && autoDetectImageFormat) {
Q_ASSERT(qobject_cast<QFile*>(device) != 0); // future-proofing; for now this should always be the case, so...
QFile *file = static_cast<QFile *>(device);
if (file->error() == QFileDevice::ResourceError) {
// this is bad. we should abort the open attempt and note the failure.
imageReaderError = QImageReader::DeviceError;
errorString = file->errorString();
return false;
}
QList<QByteArray> extensions = QImageReader::supportedImageFormats();
if (!format.isEmpty()) {
// Try the most probable extension first
@ -574,7 +584,6 @@ bool QImageReaderPrivate::initHandler()
int currentExtension = 0;
QFile *file = static_cast<QFile *>(device);
QString fileName = file->fileName();
do {