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@snikch
Last active Jan 6, 2022
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Convert a UUID to UTF-8 encoding to visually shorten.
>> code = Urlcode.uuid_to_code("4c3559f0-cd95-482f-a27d-b2bbc68523ef")
=> "䰵姰축䠯ꉽ늻욅⏯"
>> Urlcode.code_to_uuid(code)
=> "4c3559f0-cd95-482f-a27d-b2bbc68523ef"
class Urlcode
OFFSET = 0
def self.uuid_to_code(uuid)
# Get each character code
bytes = uuid.gsub('-','').split('').map do |char|
charcode(char)
end
# Map into a single binary string map
bitmap = bytes.map{|b|
str = b.to_s(2)
while str.length < 4
str = "0" + str
end
str
}
chunkmap = bitmap.join('').scan(/.{1,16}/)
unicodemap = chunkmap.map do |chunk|
(chunk.to_i(2)+OFFSET).chr
end.join('').encode("UTF-8")
end
def self.code_to_uuid(string)
bitmap = []
string.each_codepoint do |code|
map = []
str = (code - OFFSET).to_s(2)
while str.length < 16
str = "0" + str
end
bitmap << (str)
end
chunkmap = bitmap.join('').scan(/.{1,4}/)
out = chunkmap.map do |chunk|
code = chunk.to_i(2)
if code < 10
(code + 48).chr
else
(code + 87).chr
end
end.
join('').
# Match the uuid portions and add the dashes back in
scan(/([0-9a-f]{8})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{12})/).
first.
join('-')
end
private
# Custom hex character set
# 0-9a-f
def self.charcode(char)
if char.match(/[0-9]/)
char.each_byte.first - 48
elsif char.match(/[a-f]/)
char.each_byte.first - 87
else
raise "Only 0-9 and a-f supported"
end
end
end
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