When uploading the file, the file isn't saved, but the data within the file is processed. Here's the code for processing the uploaded file (I've cleaned it up and simplified. It's a program I inherited.):

sub upload {
        my $self = shift;
        my $q = $self->query;
        if(untaintFile($q->param('file')) && $q->upload('file')) {
                my $filename=untaintFile($q->param('file'));
                ($filename) = $filename =~ /([[:ascii:]]+)/;
                my $file = $q->upload('file');
                my $data;
                while(<$file>) {
                        $data .= $_;
                }
                if($data) {
                        my $thisfile = File->parse($data);
                        
                        if(my $format_error = $thisfile->check_formatt
+ing()) {
                                ...warn the user if there are any file
+ format errors...
                                return;
                        }
                        my $file_id = $self->file_upload({name => $fil
+ename, data => $data});
                }
        }

        $self->header_type('redirect');
        $self->header_props(-url => "$CONFIG{userbase}/user.pl");
        return;
}

sub parse {
        my $proto = shift;
        my $origfile = shift;
        my @lines = ();
        my $file = $origfile;
        LINE: while(length($file) >= 94) {
                $file =~ s/^\D*//;
                push @lines, substr($file, 0, 94, '');
                if(@lines && substr($lines[-1], 0, 1) eq '9') {
                        last LINE; # Don't need to parse any more afte
+r the file control record
                }
        }

        my @batches = ();
        for(my $i = 0; $i < @lines; $i++) {
                if(substr($lines[$i], 0, 1) eq '5') { # Batch Header
                        my @tempbatch = ();
                        for(; $i < @lines; $i++) {
                                push @tempbatch, $lines[$i];
                                if(substr($lines[$i], 0, 1) eq '8') { 
+# Batch Control
                                        last;
                                }
                        }
                        push @batches, File::Batches->new(\@tempbatch)
+;
                }
        }

        my $self = {
                file            => $origfile,
                lines           => \@lines,
                batches         => \@batches,
                total_subtract     => substr($lines[-1], 31, 12),
                total_add    => substr($lines[-1], 43, 12),
        };

        bless $self, $proto;
        return $self;
}
sub file_upload {
        my $self = shift;

        my %params = validate(@_, {
                name    => { type => SCALAR },
                data    => { type => SCALAR },
        });

        my $thisFile = File->parse($params{data});

        my @effective_dates;
        tie @effective_dates, 'Array::Unique';

        @effective_dates = $thisFile->get_effective_dates;

        ...insert data into database...

        return $id; #return the primary key
}
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