Hi,

Clam AV handle compressed file that exceeds default compression ratio as virus (see question 36 in http://www.clamav.net/faq.html)

If you run clamscan from command line, you can disable this behavior using option --max-ratio=0

So, can be useful passing options when clam is invoked by Moodle too.

Following patch in lib/uploadlib.php allow to pass option to clam.

Just replace:

if (!$CFG->pathtoclam // !file_exists($CFG-pathtoclam) // !is_executable($CFG->pathtoclam)) {

whith:

$optpos = strpos($CFG->pathtoclam, -);

if ($optpos === false)

{ $clampath = trim($CFG->pathtoclam); }

else

{ $clampath = trim(substr($CFG->pathtoclam, 0, $optpos)); }

if (!$clampath // !file_exists($clampath) // !is_executable($clampath)) {