Elixir lazy iterate over byte string (aka "binary" type)

bitstringstream.ex

defmodule BitStringStream do

  def binary_to_stream(s) do
    Stream.unfold(s, fn
      <<next::8, rem::binary>> -> {next, rem}
      <<>> -> nil
    end)
  end

  def bitstring_to_stream(s, n) do
    Stream.unfold(s, fn
      <<next::bitstring-size(n), rem::bitstring>> -> {next, rem}
      <<>> -> nil
    end)
  end

end