Class: BookLab::Plantuml

Inherits:
Object
  • Object
show all
Defined in:
lib/booklab/plantuml.rb

Class Method Summary collapse

Class Method Details

.append3bytes(b1, b2, b3) ⇒ Object 



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# File 'lib/booklab/plantuml.rb', line 19

def append3bytes(b1, b2, b3)
  c1 = b1 >> 2
  c2 = ((b1 & 0x3) << 4) | (b2 >> 4)
  c3 = ((b2 & 0xF) << 2) | (b3 >> 6)
  c4 = b3 & 0x3F
  return encode6bit(c1 & 0x3F).chr +
         encode6bit(c2 & 0x3F).chr +
         encode6bit(c3 & 0x3F).chr +
         encode6bit(c4 & 0x3F).chr
end

.encode(text) ⇒ Object 



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# File 'lib/booklab/plantuml.rb', line 6

def encode(text)
  result = ""
  compressedData = Zlib::Deflate.deflate(text)
  compressedData.chars.each_slice(3) do |bytes|
    #print bytes[0], ' ' , bytes[1] , ' ' , bytes[2]
    b1 = bytes[0].nil? ? 0 : (bytes[0].ord & 0xFF)
    b2 = bytes[1].nil? ? 0 : (bytes[1].ord & 0xFF)
    b3 = bytes[2].nil? ? 0 : (bytes[2].ord & 0xFF)
    result += append3bytes(b1, b2, b3)
  end
  result
end

.encode6bit(b) ⇒ Object 



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# File 'lib/booklab/plantuml.rb', line 30

def encode6bit(b)
  if b < 10
    return ('0'.ord + b).chr
  end
  b = b - 10
  if b < 26
    return ('A'.ord + b).chr
  end
  b = b - 26
  if b < 26
    return ('a'.ord + b).chr
  end
  b = b - 26
  if b == 0
    return '-'
  end
  if b == 1
    return '_'
  end
  return '?'
end