getimagesizefromstring($imageFile) returns false causing exception when loading presentation

[websuasive]

Exception thrown trying to load powerpoint presentation due getimagesizefromstring($imageFile) returning false, rather than a valid array.

(ErrorException(code: 0): Trying to access array offset on value of type bool at /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php:805)
[stacktrace]
#0 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(805): Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(1372): PhpOffice\PhpPresentation\Reader\PowerPoint2007->loadShapeDrawing()
#2 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(506): PhpOffice\PhpPresentation\Reader\PowerPoint2007->loadSlideShapes()
#3 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(396): PhpOffice\PhpPresentation\Reader\PowerPoint2007->loadMasterSlide()
#4 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(353): PhpOffice\PhpPresentation\Reader\PowerPoint2007->loadMasterSlides()
#5 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(169): PhpOffice\PhpPresentation\Reader\PowerPoint2007->loadSlides()
#6 /var/www/html/vendor/phpoffice/phppresentation/src/PhpPresentation/Reader/PowerPoint2007.php(136): PhpOffice\PhpPresentation\Reader\PowerPoint2007->loadFile()
#7 /var/www/html/app/Helpers/ParsePptx.php(35): PhpOffice\PhpPresentation\Reader\PowerPoint2007->load()

Code with issuein PowerPoint2007.php:

$pathImage = implode('/', $pathImage);
$imageFile = $this->oZip->getFromName($pathImage);
if (!empty($imageFile)) {
if ($oShape instanceof Gd) {
$info = getimagesizefromstring($imageFile); <=============================================
$oShape->setMimeType($info['mime']);
$oShape->setRenderingFunction(str_replace('/', '', $info['mime']));
$oShape->setImageResource(imagecreatefromstring($imageFile));
} elseif ($oShape instanceof Base64) {
$oShape->setData('data:image/svg+xml;base64,' . base64_encode($imageFile));
}
}

[websuasive]

It seems the image causing the problems is one on the slide master layer - and it's an .EMF image.

[websuasive]

See #490 - same problem/feature request.

In the short term, as more people are seeing this - a simple:

if ($info !== false) {
$oShape->setMimeType($info['mime']);
$oShape->setRenderingFunction(str_replace('/', '', $info['mime']));
$oShape->setImageResource(imagecreatefromstring($imageFile));
}

stops the code from breaking and enables the reader to get the rest of the file.

Is this a permissible fix?