30 lines
804 B
Elixir
30 lines
804 B
Elixir
defmodule Openflow.Instruction do
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def read(instruction_bin) do
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do_read([], instruction_bin)
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end
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def to_binary(instructions) when is_list(instructions) do
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to_binary(<<>>, instructions)
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end
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def to_binary(instruction) do
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to_binary([instruction])
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end
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# private functions
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defp do_read(acc, <<>>), do: Enum.reverse(acc)
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defp do_read(acc, <<type::16, length::16, _::bytes>> = binary) do
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<<instruction_bin::size(length)-bytes, rest::bytes>> = binary
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codec = Openflow.Enums.to_atom(type, :instruction_type)
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do_read([codec.read(instruction_bin) | acc], rest)
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end
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defp to_binary(acc, []), do: acc
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defp to_binary(acc, [instruction | rest]) do
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codec = instruction.__struct__
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to_binary(<<acc::bytes, codec.to_binary(instruction)::bytes>>, rest)
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end
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end
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