Determining the file size using the exec() method is implemented for Linux, BSD, and Windows. However, on systems matching neither platform name (like SunOS), the fall-through path will return a file size result constituting a zero size instead of an invalid null return value.
if (\OC_Helper::is_function_enabled('exec')) {
$os = strtolower(php_uname('s'));
$arg = escapeshellarg($filename);
- $result = '';
+ $result = null;
if (strpos($os, 'linux') !== false) {
$result = $this->exec("stat -c %s $arg");
} else if (strpos($os, 'bsd') !== false || strpos($os, 'darwin') !== false) {