From: "Cyril.Liu" <terry6394@...>
Date: 2010-08-20T12:08:36+09:00
Subject: Re: Is there any clever way to encode the uuid string with base64?

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it's cool! thx Clifford :)

On Fri, Aug 20, 2010 at 9:25 AM, Clifford Heath <no@spam.please.net> wrote:

> Chuck Remes wrote:
>
>> On Aug 19, 2010, at 11:19 AM, Cyril.Liu wrote:
>>
>>> But the string is too long for me, i want to encode it with base64.
>>> Is any clever way to do this?
>>>
>> If anything, base64 encoding will make it *longer*.
>>
>
> Not if he converts it to binary first.
>
> Here's one I made earlier, not base64 though; this is base91.
> It turns UUIDs into 20 printable ASCII bytes.
> You can change the reference string to whatever you like.
> I use sysuuid (gem install it), but you make get uuids elsewhere.
>
> require 'sysuuid'
>
> class Integer
>  def base(b)
>   self < b ? [self] : (self/b).base(b) + [self%b]
>  end
> end
>
> # If we only used upper, lower and digits (base 62), it'd need 22
> characters and be more easily copy-pastable
> BASE91 =
> '!#$%&()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~'
>
> uuid = sysuuid.gsub(/-/,'').hex
> uuid20 = uuid.base(91).map{|i| BASE91[i].chr }*''
> uuid_again = uuid20.split(//).inject(0){|i,e| i*91 + BASE91.index(e[0]) }
>
> Clifford Heath.
>
>

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