Class: Arpie::ListBinaryType

Inherits:
BinaryType show all
Defined in:
lib/arpie/binary/list_type.rb

Constant Summary

Constants included from Arpie

MTU

Instance Method Summary collapse

Methods inherited from BinaryType

#check_limit, #required_opts

Methods included from Arpie

#bogon!, #incomplete!

Instance Method Details

#binary_size(opts) ⇒ Object 



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# File 'lib/arpie/binary/list_type.rb', line 4

def binary_size opts
  if opts[:sizeof]
    len_handler = Binary.get_type_handler(opts[:sizeof])
    len_handler.binary_size(opts[:sizeof_opts])
  elsif opts[:length]
    case opts[:length]
      when Symbol
        opts[:object] ? opts[:object].send(opts[:length]) : nil
      else
        opts[:length]
    end
  else
    nil
  end
end

#from(binary, opts) ⇒ Object 



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# File 'lib/arpie/binary/list_type.rb', line 20

def from binary, opts
  type_of = Binary.get_type_handler(opts[:of])
  type_of_binary_size = nil
  if type_of.respond_to?(:binary_size)
    type_of_binary_size = type_of.binary_size(opts[:of_opts]) rescue nil
  end

  list = []
  consumed = 0
  length = nil

  if opts[:sizeof]
    len_handler = Binary.get_type_handler(opts[:sizeof])
    length, ate = len_handler.from(binary, opts[:sizeof_opts])
    consumed += ate

  elsif opts[:length]
    length = case opts[:length]
      when :all
        if type_of_binary_size
          binary.size / type_of_binary_size
        else
          nil
        end

      when Symbol
        opts[:object].send(opts[:length])

      else
        opts[:length]

      end
  else
    raise ArgumentError, "need one of [:sizeof, :length]"
  end

  cc, ate = nil, nil



  if length.nil?
    loop do
      nextdata = binary[consumed .. -1]
      break if !nextdata || nextdata == ""
      cc, ate = type_of.from(binary[consumed .. -1], opts[:of_opts])
      list << cc
      consumed += ate
    end

  else
    for i in 0...length do
      cc, ate = type_of.from(binary[consumed .. -1], opts[:of_opts])
      list << cc
      consumed += ate
    end
  end

  [list, consumed]
end

#to(object, opts) ⇒ Object 



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# File 'lib/arpie/binary/list_type.rb', line 80

def to object, opts
  object.is_a?(Array) or bogon! object, "require Array"

  type_of = Binary.get_type_handler(opts[:of])

  if opts[:sizeof]
    len_handler = Binary.get_type_handler(opts[:sizeof])
    ([len_handler.to(object.size, opts[:sizeof_opts])] + object.map {|o|
      type_of.to(o, opts[:of_opts])
    }).join('')

  elsif opts[:length]
    length = case opts[:length]
      when :all
        object.size
      when Symbol
        object.size
      else
        opts[:length]
    end

    object.size == length or bogon! object,
      "Array#size does not match required fixed width: " +
      "have #{object.size}, require #{length.inspect}"

    object.map {|o|
      type_of.to(o, opts[:of_opts])
    }.join('')

  else
    raise ArgumentError, "need one of [:sizeof, :length]"
  end

end