Class: Resolv::DNS::Message::MessageDecoder

Inherits:
Object
  • Object
show all
Defined in:
lib/spf/ext/resolv.rb

Instance Method Summary collapse

Instance Method Details

#get_labels(limit = nil) ⇒ Object 



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# File 'lib/spf/ext/resolv.rb', line 77

def get_labels(limit=nil)
  limit = @index if !limit || @index < limit
  d = []
  while true
    case @data[@index] && @data[@index].ord                             # PATCH
    when nil                                                            # PATCH
      raise DecodeError.new("truncated or malformed packet")            # PATCH
    when 0
      @index += 1
      return d
    when 192..255
      idx = self.get_unpack('n')[0] & 0x3fff
      if limit <= idx
        raise DecodeError.new("non-backward name pointer")
      end
      save_index = @index
      @index = idx
      d += self.get_labels(limit)
      @index = save_index
      return d
    else
      d << self.get_label
    end
  end
  return d
end