Elixir: gunzip

gunzip.ex

@spec gunzip(binary) :: {:ok, binary} | {:error, term}
def gunzip(data) when is_binary(data) do
  try do
    z = :zlib.open()
    :ok = :zlib.inflateInit(z, 16 + 15)

    result =
      z
      |> :zlib.inflate(data)
      |> List.flatten()
      |> Enum.join()

    :ok = :zlib.inflateEnd(z)
    :ok = :zlib.close(z)

    {:ok, result}
  rescue
    e -> {:error, inspect(e)}
  end
end

see also:

• https://stackoverflow.com/questions/33038846/how-to-zlib-inflate-an-list-of-bytes-in-elixir
• benoitc/hackney#155 (comment)
• https://ikiikinyuusankin.hatenablog.com/entry/2020/04/20/120621