Class: BasedUUID::Base32UUID

Inherits:
Object
  • Object
show all
Defined in:
lib/based_uuid/base32_uuid.rb

Constant Summary collapse

CROCKFORDS_ALPHABET = 
"0123456789abcdefghjkmnpqrstvwxyz".freeze
CHARACTER_MAP = 
CROCKFORDS_ALPHABET.bytes.freeze
ENCODED_LENGTH = 
26
BITS_PER_CHAR = 
5
ZERO = 
"0".ord
MASK = 
0x1f
UUID_LENGTH = 
32
UUID_VALIDATION_REGEXP = 
/\A[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}\z/
UUID_REGEXP = 
/\A(.{8})(.{4})(.{4})(.{4})(.{12})\z/
BASE32_VALIDATION_REGEXP = 
/\A[#{CROCKFORDS_ALPHABET}]{26}\z/

Class Method Summary collapse

Class Method Details

.decode(str) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/based_uuid/base32_uuid.rb', line 33

def decode(str)
  raise ArgumentError, "Invalid base32 string" if str !~ BASE32_VALIDATION_REGEXP

  decoded = 0

  str.each_byte do |byte|
    value = CHARACTER_MAP.index(byte)
    decoded = (decoded << BITS_PER_CHAR) | value
  end

  uuid = decoded.to_s(16)
  uuid.rjust(UUID_LENGTH, "0").scan(UUID_REGEXP).join("-")
end

.encode(uuid) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/based_uuid/base32_uuid.rb', line 17

def encode(uuid)
  raise ArgumentError, "Invalid UUID" if uuid !~ UUID_VALIDATION_REGEXP

  input = uuid.delete("-").to_i(16)
  encoded = Array.new(ENCODED_LENGTH, ZERO)
  i = ENCODED_LENGTH - 1

  while input > 0
    encoded[i] = CHARACTER_MAP[input & MASK]
    input >>= BITS_PER_CHAR
    i -= 1
  end

  encoded.pack("c*")
end