Module: PacketGen::Header::MLDv2

Defined in:
lib/packetgen/header/mldv2.rb,
lib/packetgen/header/mldv2/mlq.rb,
lib/packetgen/header/mldv2/mlr.rb,
lib/packetgen/header/mldv2/mcast_address_record.rb

Overview

This module contains all MLDv2 specific classes.

Author:

  • Sylvain Daubert

Since:

  • 2.4.0

Defined Under Namespace

Classes: MLQ, MLR, McastAddressRecord, McastAddressRecords

Class Method Summary collapse

Class Method Details

.decode(value) ⇒ Integer

Decode value for MLDv2 Max Resp Code. See RFC 3810 §5.1.3

Parameters:

  • value (Integer) —

    value to decode

Returns:

  • (Integer)

Since:

  • 2.4.0



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# File 'lib/packetgen/header/mldv2.rb', line 40

def self.decode(value)
  if value < 32_768
    value
  else
    mant = value & 0xfff
    exp = (value >> 12) & 0x7
    (0x1000 | mant) << (exp + 3)
  end
end

.encode(value) ⇒ Integer

Encode value for MLDv2 Max Resp Code. Value may be encoded as a float, so some error may occur. See RFC 3810 §5.1.3

Parameters:

  • value (Integer) —

    value to encode

Returns:

  • (Integer)

Since:

  • 2.4.0



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# File 'lib/packetgen/header/mldv2.rb', line 20

def self.encode(value)
  if value < 32_768
    value
  elsif value > 8_387_583
    0xffff
  else
    exp = 0
    value >>= 3
    while value > 8_191
      exp += 1
      value >>= 1
    end
    0x8000 | ((exp & 7) << 12) | (value & 0xfff)
  end
end