Re: Base 31 Conversion

Michael,

The code for my Base64 and Base32 routines is at
http://code.midrange.com/685fec73b1.html. I know it uses some old-looking
fixed-format code in the bitform() and charform() routines, but it is
(easily) the fastest implementation of Base64 encoding/decoding I've found.
I haven't benchmarked the Base32 routines, but I'd assume they are equally
as fast.

Although theBase32 routines work fine as-is, you can change data in
Base32Str (lines 107-138) to specify a different order/set of characters -
this version uses the RFC4648 character set: A-Z and 2-7). Just ensure that
there is a space between each 5-character hex string and the related
character (so as to ensure that each array element is 7 characters long).

As I say there, the Base16 routines haven't been written - that's an
exercise for you :)

Rory

On Wed, Jul 28, 2010 at 2:51 PM, Rory Hewitt <rory.hewitt@xxxxxxxxx> wrote:

OK, so they don't want 0 or O (too similar) or 1, I or L (too similar).

Will this be used on one machine? The reason I ask is that there is a
standard Base32 alphabet (well, there are several, actually), so if they
plan on sending this data to another server (especially a non-i) there may
be problems...

Anyway, I'll post the code asap.


On Wed, Jul 28, 2010 at 12:10 PM, Michael Ryan <michaelrtr@xxxxxxxxx>wrote:

This was odd (IMO) Rory...here are the digits they wanted to use:

'23456789ABCDEFGHJKMNPQRSTUVWXYZ'

with these characters removed - 0,1,I,L,O.

On Wed, Jul 28, 2010 at 3:05 PM, Rory Hewitt <rory.hewitt@xxxxxxxxx>
wrote:

Oh wait - I have a Base *32 *converter. How does Base 31 differ - is it

A-Z

+ 2-6 (instead of A-Z + 2-7)?

On Wed, Jul 28, 2010 at 12:00 PM, Rory Hewitt <rory.hewitt@xxxxxxxxx>
wrote:

Michael,

Yeah, I've got some code. I'll post it as soon as I can dig it out.

Rory


On Wed, Jul 28, 2010 at 11:35 AM, Michael Ryan <michaelrtr@xxxxxxxxx
wrote:

A double secret code for a vendor survey. Maybe other things too, but
that's
my application.

On Wed, Jul 28, 2010 at 2:25 PM, David Gibbs <david@xxxxxxxxxxxx>

wrote:

Michael Ryan wrote:

Anyone have a Base 31 converter? I could write one, but if

someone

has

one

that's already working, I'd appreciate it.

What's base 31 used for?

david
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