ruby bindata choice by two fields example

bindata_choice_sample.rb

require "bindata"

class D < BinData::Record
  endian :big
  uint8 :dd
end

class E < BinData::Record
  endian :big
  uint8 :ee
end

class F < BinData::Record
  endian :big
  uint8 :ff
end

class C < BinData::Record
  endian :big
  uint8 :a
  uint8 :b
  choice :f, selection: lambda { [a, b] } do
    d [0,0]
    e [0,1]
    f :default
  end
end

C.read("\x00\x00\x01")
C.read("\x00\x01\x01")
C.read("\x43\x21\x01")