From 85982c4033da4d54937078f8ae1d9c8fde072372 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Thu, 6 Aug 2015 16:25:29 +0200
Subject: Add tlv.erl.

Also, add test/check.erl for unit tests (make check).
---
 src/tlv.erl    | 34 ++++++++++++++++++++++++++++++++++
 test/check.erl | 13 +++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 src/tlv.erl
 create mode 100755 test/check.erl

diff --git a/src/tlv.erl b/src/tlv.erl
new file mode 100644
index 0000000..b1d3428
--- /dev/null
+++ b/src/tlv.erl
@@ -0,0 +1,34 @@
+%%% Copyright (c) 2015, NORDUnet A/S.
+%%% See LICENSE for licensing information.
+
+-module(tlv).
+
+-export([encode/2, decode/1]).
+
+-spec encode(binary(), binary()) -> binary().
+encode(Type, Value) ->
+    4 = byte_size(Type),           % FIXME: make Type a 4 octet binary
+    Len = byte_size(Value) + 8,
+    <<Len:32, Type/binary, Value/binary>>.
+
+-spec decode(binary()) -> {binary(), binary(), binary()}.
+decode(Data) ->
+    <<TotalLength:32, Rest1/binary>> = Data,
+    Length = TotalLength - 8,
+    <<Type:4/binary-unit:8, Rest2/binary>> = Rest1,
+    <<Value:Length/binary-unit:8, Rest3/binary>> = Rest2,
+    {Type, Value, Rest3}.
+
+%%%%%%%%%%%%%%%%%%%%
+
+-include_lib("eunit/include/eunit.hrl").
+-define(TESTDATA1, {<<"DATA">>, <<"some data">>}).
+-define(TESTDATA2, {<<"DAT2">>, <<"some other data">>}).
+
+the_test_() ->
+    {setup,
+     fun() -> [?TESTDATA1, ?TESTDATA2] end,
+     fun(_) -> ok end,
+     fun(TestVectors) ->
+             [?_assertEqual({T, V, <<>>}, decode(encode(T, V))) ||
+                 {T, V} <- TestVectors] end}.
diff --git a/test/check.erl b/test/check.erl
new file mode 100755
index 0000000..f4fdb8d
--- /dev/null
+++ b/test/check.erl
@@ -0,0 +1,13 @@
+#! /usr/bin/env escript
+%% -*- erlang -*- mode
+%%! -pa ebin -pa ../lager/ebin -pa ../lager/deps/goldrush/ebin -pa ../mochiweb/ebin -config test/check.config
+
+%% To enable logging, pass `-s lager' by adding it to the line above.
+%% Tweak the amount of logging by changing `lager_console_backend' in
+%% check.config.
+
+main(_) ->
+    ok = ht:test(),
+    ok = ts:test(),
+    ok = tlv:test().
+
-- 
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