Openflow parser

lib/openflow/meter_band.ex

@@ -0,0 +1,28 @@
+defmodule Openflow.MeterBand do
+
+  def read(meter_band_bin) do
+    do_read([], meter_band_bin)
+  end
+
+  def to_binary(meter_bands) when is_list(meter_bands) do
+    to_binary(<<>>, meter_bands)
+  end
+  def to_binary(meter_band) do
+    to_binary([meter_band])
+  end
+
+  # private functions
+
+  defp do_read(acc, <<>>), do: Enum.reverse(acc)
+  defp do_read(acc, <<type::16, length::16, _::bytes>> = binary) do
+    <<meter_band_bin::size(length)-bytes, rest::bytes>> = binary
+    codec = Openflow.Enums.to_atom(type, :meter_band_type)
+    do_read([codec.read(meter_band_bin)|acc], rest)
+  end
+
+  defp to_binary(acc, []), do: acc
+  defp to_binary(acc, [meter_band|rest]) do
+    codec = meter_band.__struct__
+    to_binary(<<acc::bytes, (codec.to_binary(meter_band))::bytes>>, rest)
+  end
+end