From: Todd Benson <caduceass@...>
Date: 2009-05-07T03:12:14+09:00
Subject: Re: Base62 encoding/decoding

On Wed, May 6, 2009 at 11:32 AM, Martin DeMello <martindemello@gmail.com> wrote:
>
> it's definitely possible, just inefficient. first you set up your lookup table:
>
>>  digits = (0..9).to_a.map(&:to_s) + ("a".."z").to_a + ("A".."Z").to_a
>>
>
> then you repeatedly find the lowest digit
>
>> out = ""
>> while n > 0
>>    rest, units = n.divmod(62)
>>    out = digits[units] + out
>>    n = rest
>> end
>
> martin
>
>

Isn't that just a simple cipher (i.e. map)?  I must be missing
something.  According to what I've read so far, base64 is not, and
base62 is, except for that paper written in a scientific journal that
I don't have access to (but, for the summary, of course).  I suppose
that is what the OP wanted anyway.

Todd