<br>
use CGI;
use CGI::Carp qw ( fatalsToBrowser );
use File::Basename;

$CGI::DISABLE_UPLOADS=0; # Allow file uploads

my $query = new CGI;
my $filename = $query->param("datei");
my $kunde = $query->param("kunde");
my $upload_dir =$query->param("ziel");
my $groesse = $query->param("groesse");
my $action ="upload ".$filename;
undef $fehler;


$CGI::POST_MAX = 1024 * $groesse;

 $content_length = $ENV{'CONTENT_LENGTH'};

if ($content_length > $CGI::POST_MAX){
erlaubnis();
if ($sonder ne 'xxx'){
$fehler =" Datei groesser als erlaubt!";
goto Meldung;
# custom request entity too large error handling }
}

}
[download]

So if you can stand JavaScript, and most people can, you could do something like this to get the file size before uploading. If your application can keep track of how much free space you have, a very basic example would be either querying this when rendering the upload page, or via a call back before you begin the file upload. As a side note your closing code tag should be </code>, rather than <code>.

This is definetly pointing in into the right direction!
However, I guess it can't work on machines that block Java, can it ?
As an explanation : I am offering webspace to my students in order they can share project-related files,
but just those (meaning no Films, etc.) Only persons worth trusting (meaning me)
should be able to upload larger files. As a traveller I am working on different computers
which I can not alter...