Module: JekyllRemotePlantUMLPlugin::Utils::Encode

Included in:
Block
Defined in:
lib/jekyll_remote_plantuml_plugin/utils.rb

Instance Method Summary collapse

Instance Method Details

#append3bytes(bit1, bit2, bit3) ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/jekyll_remote_plantuml_plugin/utils.rb', line 43

def append3bytes(bit1, bit2, bit3)
  c1 = bit1 >> 2
  c2 = ((bit1 & 0x3) << 4) | (bit2 >> 4)
  c3 = ((bit2 & 0xF) << 2) | (bit3 >> 6)
  c4 = bit3 & 0x3F
  encode6bit(c1 & 0x3F).chr +
    encode6bit(c2 & 0x3F).chr +
    encode6bit(c3 & 0x3F).chr +
    encode6bit(c4 & 0x3F).chr
end

#encode(content) ⇒ Object 



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# File 'lib/jekyll_remote_plantuml_plugin/utils.rb', line 21

def encode(content)
  encoded = content.force_encoding("utf-8")
  encoded = Zlib::Deflate.new(nil, -Zlib::MAX_WBITS).deflate(encoded, Zlib::FINISH)
  encode64(encoded)
end

#encode64(content) ⇒ Object 



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# File 'lib/jekyll_remote_plantuml_plugin/utils.rb', line 27

def encode64(content)
  length = content.length
  ind = 0
  out = ""

  while ind < length
    i1 = ind + 1 < length ? content[ind + 1].ord : 0
    i2 = ind + 2 < length ? content[ind + 2].ord : 0
    out += append3bytes(content[ind].ord, i1, i2)
    ind += 3
  end

  out
end

#encode6bit(b) ⇒ Object

rubocop:disable Naming/MethodParameterName



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# File 'lib/jekyll_remote_plantuml_plugin/utils.rb', line 56

def encode6bit(b)
  return (48 + b).chr if b < 10

  b -= 10
  return (65 + b).chr if b < 26

  b -= 26
  return (97 + b).chr if b < 26

  b -= 26
  return "-" if b.zero?

  b == 1 ? "_" : "?"
end