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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 built_in seek.ex
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lib/bin_struct/built_in/seek.ex 

defmodule BinStruct.BuiltIn.Seek do



  use BinStructCustomType



  def init_args(custom_type_args) do



    args = %{

      count: custom_type_args[:count]

    }



    case args do

      %{ count: count } when is_integer(count) -> { :ok, args }

      _ -> { :error, ":count argument required but not provided" }

    end



  end



  def parse_returning_options(bin, custom_type_args, opts) do



    %{

      count: count

    } = custom_type_args



    if byte_size(bin) >= count do



      <<seek::binary-size(count), _rest::binary>> = bin



      { :ok, seek, bin, opts  }



    else

      :not_enough_bytes

    end



  end



  def size(_data, _custom_type_args), do: 0

  def dump_binary(_data, _custom_type_args), do: <<>>



  def known_total_size_bytes(_custom_type_args), do: :unknown



  def from_unmanaged_to_managed(unmanaged, _custom_type_args), do: unmanaged

  def from_managed_to_unmanaged(managed, _custom_type_args), do: managed



end