Class: Packet::BinParser

Inherits:
Object
  • Object
show all
Defined in:
lib/packet/packet_parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BinParser

Returns a new instance of BinParser.



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# File 'lib/packet/packet_parser.rb', line 5

def initialize
  @size = 0
  @data = []
  @remaining = ""
  # 0 => reading length
  # 1 => reading actual data
  @parser_state = 0
  @length_string = ""
  @numeric_length = 0
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/packet/packet_parser.rb', line 3

def data
  @data
end

#length_string ⇒ Object

Returns the value of attribute length_string.



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# File 'lib/packet/packet_parser.rb', line 3

def length_string
  @length_string
end

#numeric_length ⇒ Object

Returns the value of attribute numeric_length.



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# File 'lib/packet/packet_parser.rb', line 3

def numeric_length
  @numeric_length
end

#parser_state ⇒ Object

Returns the value of attribute parser_state.



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# File 'lib/packet/packet_parser.rb', line 4

def parser_state
  @parser_state
end

#remaining ⇒ Object

Returns the value of attribute remaining.



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# File 'lib/packet/packet_parser.rb', line 3

def remaining
  @remaining
end

Instance Method Details

#extract(new_data) ⇒ Object 



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# File 'lib/packet/packet_parser.rb', line 23

def extract new_data
  remaining = new_data

  loop do
    if @parser_state == 0
      length_to_read =  9 - @length_string.length
      len_str,remaining = remaining.unpack("a#{length_to_read}a*")
      break if len_str !~ /^\d+$/
      if len_str.length < length_to_read
        @length_string << len_str
        break
      else
        @length_string << len_str
        @numeric_length = @length_string.to_i
        @parser_state = 1
        if remaining.length < @numeric_length
          @data << remaining
          @numeric_length = @numeric_length - remaining.length
          break
        elsif remaining.length == @numeric_length
          @data << remaining
          yield(@data.join)
          reset
          break
        else
          pack_data,remaining = remaining.unpack("a#{@numeric_length}a*")
          @data << pack_data
          yield(@data.join)
          reset
        end
      end
    elsif @parser_state == 1
      pack_data,remaining = remaining.unpack("a#{@numeric_length}a*")
      if pack_data.length < @numeric_length
        @data << pack_data
        @numeric_length = @numeric_length - pack_data.length
        break
      elsif pack_data.length == @numeric_length
        @data << pack_data
        yield(@data.join)
        reset
        break
      else
        @data << pack_data
        yield(@data.join)
        reset
      end
    end # end of beginning if condition
  end # end of loop do
end

#reset ⇒ Object 



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# File 'lib/packet/packet_parser.rb', line 16

def reset
  @data = []
  @parser_state = 0
  @length_string = ""
  @numeric_length = 0
end