Okay, the C programmer in me rebelled against the inefficiency of my earlier reply. How about:
sub b5ToInt {
use integer;
return ($_[4]||0)
+ (($_[3]||0)<<6)
+ (($_[2]||0)<<12)
+ (($_[1]||0)<<18)
+ (($_[0]||0)<<24);
}
sub intToB5 {
use integer;
my $in = int(shift);
return map { $_ & 0b111111 }
(($in >> 24),
($in >> 18),
($in >> 12),
($in >> 6),
$in);
}
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