exim-users at spodhuis
Dec 31, 2011, 1:39 PM
Post #3 of 5
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On 2011-12-31 at 06:28 -0500, Phil Pennock wrote:
> I'm assuming you're after decoding the time from the first part of the
> message id, per "3.4 Message identification", and are not concerned
> about portability to MacOS?
If you do care about MacOS, then this, but I suggest coming up with a
better name for the function and constants.
----------------------------8< cut here >8------------------------------
#!/usr/bin/perl
use warnings;
use strict;
use constant BASE62DICT => join('', 0..9, 'A'..'Z', 'a'..'z');
# The approach of redefining "62" is what Exim uses. :)
use constant BASE62SIZE => $^O eq "darwin" ? 36 : 62;
sub base62_to_num {
my @input = split(//, $_[0]);
my $result = 0;
foreach my $b62digit (@input) {
my $offset = index BASE62DICT, $b62digit;
if ($offset == -1 or $offset >= BASE62SIZE) {
die "exception/base62_to_num: invalid base62 digit: $b62digit";
}
$result *= BASE62SIZE;
$result += $offset;
}
return $result;
}
foreach my $arg (@ARGV) {
if ($arg =~ /-/) {
print "$arg :\n";
foreach my $x (split(/-/, $arg)) {
print "\t$x\t", base62_to_num($x), "\n";
}
} else {
print $arg, "\t", base62_to_num($arg), "\n";
}
}
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