use strict;
use warnings;

use Archive::Zip qw/AZ_OK/;
use File::Temp qw/tempfile/;

use constant MB => 1024 * 1024;

my $dir = '/allfiletozip/';
my @files = do {
 opendir my $fd, "$dir" or die $! or die $!;
 grep -f, map  "$dir$_", readdir $fd;
};

my $zip = Archive::Zip->new;
my $total;
my $limit = 50*MB;

foreach my $file (@files) {

 my $temp = Archive::Zip->new;

 my $member = $temp->addFile($file);
 next unless $member->compressedSize;

 my $fh = tempfile();
 $temp->writeToFileHandle($fh) == AZ_OK or die $!;
 
 $zip->addMember($member);
 $total += $member->compressedSize;
 die "$total bytes exceeds archive size limit" if $total > $limit;
}

print "Total archive size: $total bytes\n\n";

$zip->writeToFileNamed('zipped.zip') == AZ_OK or die $!;