Support FILETRANSFER command

Author: chrisdambrosio

lib/jeff/command.ex

@@ -48,6 +48,7 @@ defmodule Jeff.Command do
     ComSettings,
     EncryptionKey,
     EncryptionServer,
+    FileTransfer,
     LedSettings,
     OutputSettings,
     TextSettings
@@ -117,6 +118,7 @@ defmodule Jeff.Command do
   defp encode(KEYSET, params), do: EncryptionKey.encode(params)
   defp encode(CHLNG, params), do: ChallengeData.encode(params)
   defp encode(SCRYPT, params), do: EncryptionServer.encode(params)
+  defp encode(FILETRANSFER, params), do: FileTransfer.encode(params)
   defp encode(ACURXSIZE, size: size), do: <<size::size(16)-little>>
   defp encode(ABORT, _params), do: nil
 

lib/jeff/command/file_transfer.ex

@@ -0,0 +1,46 @@
+defmodule Jeff.Command.FileTransfer do
+  @moduledoc """
+  File Transfer Command Settings
+
+  OSDP v2.2 Specification Reference: 6.26
+  """
+
+  defstruct type: 1,
+            total_size: 0,
+            offset: 0,
+            fragment_size: 0,
+            data: <<>>
+
+  @type t :: %__MODULE__{
+          type: 1..255,
+          total_size: non_neg_integer(),
+          offset: non_neg_integer(),
+          data: binary(),
+        }
+
+  @type param() ::
+          {:type, 1..255}
+          | {:total_size, non_neg_integer()}
+          | {:offset, non_neg_integer()}
+          | {:fragment_size, non_neg_integer()}
+          | {:data, binary()}
+  @type params() :: t() | [param()]
+
+  @spec new(params()) :: t()
+  def new(params) do
+    struct(__MODULE__, params)
+  end
+
+  @spec encode(params()) :: binary()
+  def encode(params) do
+    settings = new(params)
+
+    <<
+      settings.type,
+      settings.total_size::size(4)-unit(8)-little,
+      settings.offset::size(4)-unit(8)-little,
+      settings.fragment_size::size(2)-unit(8)-little,
+      settings.data::binary
+    >>
+  end
+end