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BinStruct is a library which provides you rich set of tools for parsing/encoding binaries

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bin_struct lib bin_struct flags_reader.ex
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lib/bin_struct/flags_reader.ex 

defmodule BinStruct.FlagsReader do



  @moduledoc """

  Useful in `registered_callbacks` when library can't achieve automatic type conversion.



  ```elixir

  iex> flags = [{0x01, :flag_a}, {0x02, :flag_b}]

  ...> BinStruct.FlagsReader.read_flags_from_integer(flags, 0x01)

  [:flag_a]

  ```

  """



  def read_flags_from_integer([], _integer), do: []



  def read_flags_from_integer([{flag_mask, flag} | rest], integer) do



    is_set = Bitwise.band(integer, flag_mask) > 0



    if is_set do

      [ flag | read_flags_from_integer(rest, integer)]

    else

      read_flags_from_integer(rest, integer)

    end



  end



end