module Net
  module NTLM

    class SecurityBuffer < FieldSet

      int16LE   :length,        {:value => 0}
      int16LE   :allocated,     {:value => 0}
      int32LE   :offset,        {:value => 0}

      attr_accessor :active
      def initialize(opts={})
        super()
        @value  = opts[:value]
        @active = opts[:active].nil? ? true : opts[:active]
        @size = 8
      end

      def parse(str, offset=0)
        if @active and str.size >= offset + @size
          super(str, offset)
          @value = str[self.offset, self.length]
          @size
        else
          0
        end
      end

      def serialize
        super if @active
      end

      def value
        @value
      end

      def value=(val)
        @value = val
        self.length = self.allocated = val.size
      end

      def data_size
        @active ? @value.size : 0
      end
    end

  end
end