Is there a more efficient way to get a checksum of all files in a directory?

sub print_dir {
  my $dir_name = shift;
  print "DIR: $dir_name\n";
  opendir ( my $dir_h , "$dir_name")  or die "Unable to open dir :$dir
+_name: $!\n";
  while ( my $path = readdir($dir_h) ) {
    next if ($path eq "." or $path eq "..");
    my $full_path = "$dir_name/$path";
    if ( -l $full_path) {
      my $linkref = readlink($full_path);
      print "  LINK: $full_path ==> $linkref\n" if $opt_debug;
      push(@bom_data, { Type => "symlink", Name => "$full_path", LinkR
+ef => "$linkref" });
    } elsif ( -d $full_path ) {
      push(@bom_data, { Type => "dir", Name => "$full_path" });
      print_dir ( $full_path );
    } else {
      my $ctx = Digest::Adler32::XS->new();
      my $file_h = IO::File->new($full_path, "r");
      die "? Error: Unable to open $full_path for read: $!" if (not de
+fined($file_h));
      binmode($file_h) || "? Error: Unable to set binmode on $file_h: 
+$!\n";
      $ctx->addfile($file_h);
      $file_h->close;
      my $cksum = $ctx->hexdigest;
      print "  FILE: $full_path ==> $cksum\n" if $opt_debug;
      push(@bom_data, { Type => "file", Name => "$full_path", Checksum
+ => "$cksum"});
    }
  }
  close $dir_h;
}
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Thanks for any suggestions.