Method: RubyLabs::BitLab#encode

Defined in:
lib/bitlab.rb

#encode(s, type, opt = nil) ⇒ Object

Make a Message object for the characters in string s. The second parameter determines the code to use. It can be :ascii, :parity, a hash object that has code mappings for letters, or a Huffman tree. If a hash or tree is passed, the message type is set to :packed, otherwise it’s :unpacked. The encoding type is saved so it can be used later in decoding.

Example:

>> encode("atg", :ascii)
=> 01100001 01110100 01100111

>> nt_code
=> {"a"=>00, "c"=>10, "g"=>11, "t"=>01}
>> encode("atg", nt_code)
=> 000111



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# File 'lib/bitlab.rb', line 122

def encode(s, type, opt = nil)
  if (type.class == Hash || type.class == Node)
    code = (type.class == Node) ? assign_codes(type) : type
    msg = Message.new(:packed)
    s.each_byte do |ch|
      msg << code[ch.chr]
      printf("%s: %s\n", ch.chr, code[ch.chr]) if opt == :trace
    end
  else
    msg = Message.new(:unpacked)
    s.each_byte do |ch|
      code = ch.code(8)
      code.add_parity_bit if type == :parity
      msg << code
      printf("%s: %s\n", ch.chr, code) if opt == :trace
    end
  end
  return msg  
end