Class: BitStruct::OctetField

Inherits:
CharField show all
Defined in:
lib/bit-struct/octet-field.rb

Overview

Class for char fields that can be accessed with values like “xxx.xxx.xxx.xxx”, where each xxx is up to 3 decimal digits representing a single octet. The original string-based accessors are still available with the _chars suffix.

Declared with BitStruct.octets.

Direct Known Subclasses

HexOctetField

Constant Summary collapse

SEPARATOR = 
"."
FORMAT = 
"%d"
BASE = 
10

Instance Attribute Summary

Attributes inherited from Field

#default, #display_name, #format, #length, #name, #offset, #options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Field

#class_name, default, #describe, #initialize, #inspect_in_object, #inspectable?

Constructor Details

This class inherits a constructor from BitStruct::Field

Class Method Details

.class_name ⇒ Object

Used in describe.



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# File 'lib/bit-struct/octet-field.rb', line 12

def self.class_name
  @class_name ||= "octets"
end

Instance Method Details

#add_accessors_to(cl, attr = name) ⇒ Object

:nodoc:



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# File 'lib/bit-struct/octet-field.rb', line 20

def add_accessors_to(cl, attr = name) # :nodoc:
  attr_chars = "#{attr}_chars"
  super(cl, attr_chars)
  sep   = self.class::SEPARATOR
  base  = self.class::BASE
  fmt   = self.class::FORMAT
  
  cl.class_eval do
    define_method attr do ||
      ary = []
      send(attr_chars).each_byte do  |c|
        ary << fmt % c
      end
      ary.join(sep)
    end
    
    old_writer = "#{attr_chars}="

    define_method "#{attr}=" do |val|
      data = val.split(sep).map{|s|s.to_i(base)}.pack("c*")
      send(old_writer, data)
    end
  end
end