Class: Simatic::Types::S7String

Inherits:
SimaticType show all
Defined in:
lib/simatic/types/s7_string.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from SimaticType

parse

Constructor Details

#initialize(value, size = nil) ⇒ S7String

Returns a new instance of S7String.



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# File 'lib/simatic/types/s7_string.rb', line 6

def initialize value, size = nil
  @size = size
  @value = value
end

Class Method Details

.parse_one(raw_value) ⇒ Object 



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# File 'lib/simatic/types/s7_string.rb', line 25

def self.parse_one raw_value
  res = raw_value.unpack('CCa*')

  buf_size = res[0]
  string_size = res[1]
  string = res[2]

  raise "S7String is broken, cant parse" if buf_size.nil? || string_size.nil? || string.nil? || buf_size < string_size

  string[0, string_size]
end

.serialize(value, size) ⇒ Object 



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# File 'lib/simatic/types/s7_string.rb', line 11

def self.serialize value, size
  raise "Value must be String class" unless value.kind_of? String
  size = size || value.length
  [size, value.length, value].pack("CCa#{size}x")
end

Instance Method Details

#serialize ⇒ Object 



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# File 'lib/simatic/types/s7_string.rb', line 17

def serialize
  if @value.kind_of? Array
    @value.map { |single_val| self.class.serialize single_val, @size }
  else
    self.class.serialize @value, @size
  end
end