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Read and update image metadata

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exiffer lib exiffer binary rewrite.ex
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lib/exiffer/binary/rewrite.ex 

defmodule Exiffer.Binary.Rewrite do

  @moduledoc """

  Rewrite an image file, adding and removing arbitrary metadata

  """



  alias Exiffer.Binary.Buffer

  alias Exiffer.{GPS, JPEG, Rewrite}



  def set_gps(source, %{longitude: longitude, latitude: latitude, altitude: altitude}) when is_binary(source) do

    input = Buffer.new(source)



    gps = %GPS{longitude: longitude, latitude: latitude, altitude: altitude}



    {:ok, metadata, input} = Rewrite.set_gps(input, gps)



    header_binary = Exiffer.Serialize.binary(metadata)

    remainder = input.size - input.position

    <<_before::binary-size(input.position), rest::binary-size(remainder)>> = input.original



    <<

      JPEG.magic()::binary,

      header_binary::binary,

      rest::binary

    >>

  end

end