converting IPv4 string to uint32 (and back again)

[Michael Foord]

On 04/12/14 21:07, Gustavo Niemeyer wrote:
> I generally just "hand code" that sort of logic as well:
>
> http://play.golang.org/p/Hvi9t_ZFlw
>
> and yeah, big-endian is the "network byte order". Technically, 
> anything would work (XOR it with 42!), but it would be surprising.
>

Thanks guys.

Both those solutions are more elegant than mine, I was converting the 
decimal digits into a hex string and then into an integer using strconv 
functions. You can do that in one line of Python with list 
comprehensions, but it's a bit longer in Go. It also has a bug - the hex 
strings need zero padding:

http://pastebin.ubuntu.com/9370769/

Michael

>
>
>
>
> On Thu Dec 04 2014 at 5:50:13 PM Nate Finch <nate.finch at canonical.com 
> <mailto:nate.finch at canonical.com>> wrote:
>
>     http://play.golang.org/p/H1DI2Bw1OY
>
>     Michael was working on translating an ipv4 strings to uint32 (he
>     said int, but I hope he meant uint32).  He was hand coding it, but
>     I figured there was a better way using the built-in libraries. 
>     Turns out it's not too bad.  The code is in the link above.  I
>     thought it was interesting, so I'm cc'ing juju-dev.
>
>     The only thing I wasn't sure about was BigEndian vs.
>     LittleEndian.  IMO, 0.0.0.5 -> 5 makes the most sense, so I went
>     with BigEndian.  I suppose it doesn't matter as long as the
>     conversions are kept consistent in both directions.
>
>     -Nate
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