+sub parse_size {
+ my ($value) = @_;
+
+ return undef if $value !~ m/^(\d+(\.\d+)?)([KMGT])?$/;
+ my ($size, $unit) = ($1, $3);
+ if ($unit) {
+ if ($unit eq 'K') {
+ $size = $size * 1024;
+ } elsif ($unit eq 'M') {
+ $size = $size * 1024 * 1024;
+ } elsif ($unit eq 'G') {
+ $size = $size * 1024 * 1024 * 1024;
+ } elsif ($unit eq 'T') {
+ $size = $size * 1024 * 1024 * 1024 * 1024;
+ }
+ }
+ return int($size);
+};
+
+sub format_size {
+ my ($size) = @_;
+
+ $size = int($size);
+
+ my $kb = int($size/1024);
+ return $size if $kb*1024 != $size;
+
+ my $mb = int($kb/1024);
+ return "${kb}K" if $mb*1024 != $kb;
+
+ my $gb = int($mb/1024);
+ return "${mb}M" if $gb*1024 != $mb;
+
+ my $tb = int($gb/1024);
+ return "${gb}G" if $tb*1024 != $gb;
+
+ return "${tb}T";
+};
+