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The MongoDB driver for Elixir

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mongodb_driver lib mongo compressor.ex
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lib/mongo/compressor.ex 

defmodule Mongo.Compressor do

  @moduledoc false



  @zlib_compressor_id 2

  if Code.ensure_loaded?(:ezstd) do

    @zstd_compressor_id 3

  end



  def compress(binary, :zlib) do

    {@zlib_compressor_id, :zlib.compress(binary)}

  end



  if Code.ensure_loaded?(:ezstd) do

    def compress(binary, :zstd) when is_binary(binary) do

      {@zstd_compressor_id, :ezstd.compress(binary)}

    end



    def compress(iodata, :zstd) when is_list(iodata) do

      {@zstd_compressor_id,

       iodata

       |> IO.iodata_to_binary()

       |> :ezstd.compress()}

    end

  end



  def uncompress(binary, @zlib_compressor_id) do

    :zlib.uncompress(binary)

  end



  if Code.ensure_loaded?(:ezstd) do

    def uncompress(binary, @zstd_compressor_id) do

      :ezstd.decompress(binary)

    end

  end



  def uncompress(binary, :zlib) do

    :zlib.uncompress(binary)

  end



  if Code.ensure_loaded?(:ezstd) do

    def uncompress(binary, :zstd) do

      :ezstd.decompress(binary)

    end

  end

end