From: Robert Klemme <shortcutter@...>
Date: 2008-05-07T02:10:08+09:00
Subject: Re: Conversion mask in hex to bit mask

On 06.05.2008 13:29, Marcin Tyman wrote:
> 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

Not sure what exactly you mean by this.  Do you want to count 1's?

Here are some things you can do:

irb(main):001:0> c = 0xffff0000
=> 4294901760
irb(main):002:0> c.to_s(2)
=> "11111111111111110000000000000000"
irb(main):003:0> c.to_s(2).length
=> 32

Bit access:

irb(main):004:0> c[0]
=> 0
irb(main):005:0> c[20]
=> 1

> My question is how to convert such hexes to bit mask (the 16 in above
> example)

Cheers

	robert