From: Todd Benson <caduceass@...>
Date: 2008-05-06T23:54:00+09:00
Subject: Re: Conversion mask in hex to bit mask

On Tue, May 6, 2008 at 6:29 AM, Marcin Tyman <m.tyman@interia.pl> wrote:
> Hi,
>  The issue is: how to convert hex mask to bit mask? For instance:
>
>  I have 0xffff0000   ->  it can be represent by 255.255.0.0 or by string
>  of bits - 16
>
>  My question is how to convert such hexes to bit mask (the 16 in above
>  example)
>
>
>  Thanks in advance,
>  Have a nice day

irb(main):001:0> 0xffff0000.to_s(2) =~ /0*$/
=> 16

Untested for other masks.

hth,
Todd