Is there any clever way to encode the uuid string with base64?

ruby-talk
1

I've got the uuid string using uuid.rb just like this:

ree-1.8.7-2010.02 > uuid = UUID.new()
=> MAC: 34:15:9e:33:f8:3c Sequence: 19368
ree-1.8.7-2010.02 > uuid.generate(:compact)
=> "d52553808dda012d4ba834159e33f83c"

But the string is too long for me, i want to encode it with base64.
Is any clever way to do this?

2

If anything, base64 encoding will make it *longer*.

What are you trying to accomplish?

cr

···

On Aug 19, 2010, at 11:19 AM, Cyril.Liu wrote:

I've got the uuid string using uuid.rb just like this:

ree-1.8.7-2010.02 > uuid = UUID.new()
=> MAC: 34:15:9e:33:f8:3c Sequence: 19368
ree-1.8.7-2010.02 > uuid.generate(:compact)
=> "d52553808dda012d4ba834159e33f83c"

But the string is too long for me, i want to encode it with base64.
Is any clever way to do this?

3

Cyril.Liu wrote:

I've got the uuid string using uuid.rb just like this:

ree-1.8.7-2010.02 > uuid = UUID.new()
=> MAC: 34:15:9e:33:f8:3c Sequence: 19368
ree-1.8.7-2010.02 > uuid.generate(:compact)
=> "d52553808dda012d4ba834159e33f83c"

But the string is too long for me, i want to encode it with base64.
Is any clever way to do this?

str = "d52553808dda012d4ba834159e33f83c"
puts [[str].pack("H*")].pack("m")
# => "1SVTgI3aAS1LqDQVnjP4PA==\n"

···

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Posted via http://www.ruby-forum.com/\.

4

Chuck Remes 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.

···

On Aug 19, 2010, at 11:19 AM, Cyril.Liu wrote:

5

it's cool! thx Clifford :slight_smile:

···

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.