Method: Gruesome::Z::ZSCII.encode

Defined in:

lib/gruesome/z/zscii.rb

.encode(string, version) ⇒ Object

# File 'lib/gruesome/z/zscii.rb', line 215

def ZSCII.encode(string, version)
  codes = []
  string.each_char do |chr|
    subcodes = ZSCII.translate_char(chr, version)
    subcodes.each do |code|
      codes << code
    end
  end

  # pad codes to be divisible by three
  # and pad with '5' shift code
  (codes.length % 3).times do 
    codes << 5
  end
  
  # encode the z-codes
  words = []

  word = 0
  codes.each_with_index do |code, i|
    if (i % 3) == 0
      word = (code & 0b11111) << 10
    elsif (i % 3) == 1
      word |= (code & 0b11111) << 5
    else
      word |= code & 0b11111
      words << word
    end
  end

  # Give single that it is the last word
  words[-1] |= 0b10000000_00000000

  words
end