tests/pkg_flattbuffers: add sample application

tests/pkg_flatbuffers/.gitignore

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+monster_generated.h

tests/pkg_flatbuffers/Makefile

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+include ../Makefile.tests_common
+
+USEPKG += flatbuffers
+
+# Skip warning raised when building monster_generated.h
+CXXEXFLAGS += -Wno-type-limits
+
+BUILDDEPS += monster_generated.h
+
+include $(RIOTBASE)/Makefile.include
+
+monster_generated.h: $(FLATC)
+	$(Q)$(FLATC) --cpp $(CURDIR)/monster.fbs

tests/pkg_flatbuffers/Makefile.ci

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+BOARD_INSUFFICIENT_MEMORY := \
+    stm32f030f4-demo \
+    #

tests/pkg_flatbuffers/README.md

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+FlatBuffer sample application
+=============================
+
+This application shows how to use the FlatBuffer library from Google for
+serializing/deserializing a runtime C++ object to/from a binary buffer.
+
+The application is
+[taken as is from the upstream repository](https://github.com/google/flatbuffers/blob/master/samples/sample_binary.cpp).
+
+More details are available on
+[the FlatBuffers website](http://google.github.io/flatbuffers/).
+
+Usage
+-----
+
+Simply flash and run the application on the board of your choice using:
+
+    make BOARD=<board of your choice> -C tests/pkg_flatbuffers flash term
+
+Expected result
+---------------
+
+The application creates an object, serialize it in a FlatBuffer and after
+reloading the serialized object it displays:
+
+    "The FlatBuffer was successfully created and verified!"

tests/pkg_flatbuffers/main.cpp

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+/*
+ * Copyright 2015 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include "monster_generated.h"  // Already includes "flatbuffers/flatbuffers.h".
+
+using namespace MyGame::Sample;
+
+// Example how to use FlatBuffers to create and read binary buffers.
+
+int main(int /*argc*/, const char * /*argv*/[]) {
+  // Build up a serialized buffer algorithmically:
+  flatbuffers::FlatBufferBuilder builder;
+
+  // First, lets serialize some weapons for the Monster: A 'sword' and an 'axe'.
+  auto weapon_one_name = builder.CreateString("Sword");
+  short weapon_one_damage = 3;
+
+  auto weapon_two_name = builder.CreateString("Axe");
+  short weapon_two_damage = 5;
+
+  // Use the `CreateWeapon` shortcut to create Weapons with all fields set.
+  auto sword = CreateWeapon(builder, weapon_one_name, weapon_one_damage);
+  auto axe = CreateWeapon(builder, weapon_two_name, weapon_two_damage);
+
+  // Create a FlatBuffer's `vector` from the `std::vector`.
+  std::vector<flatbuffers::Offset<Weapon>> weapons_vector;
+  weapons_vector.push_back(sword);
+  weapons_vector.push_back(axe);
+  auto weapons = builder.CreateVector(weapons_vector);
+
+  // Second, serialize the rest of the objects needed by the Monster.
+  auto position = Vec3(1.0f, 2.0f, 3.0f);
+
+  auto name = builder.CreateString("MyMonster");
+
+  unsigned char inv_data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+  auto inventory = builder.CreateVector(inv_data, 10);
+
+  // Shortcut for creating monster with all fields set:
+  auto orc = CreateMonster(builder, &position, 150, 80, name, inventory,
+                           Color_Red, weapons, Equipment_Weapon, axe.Union());
+
+  builder.Finish(orc);  // Serialize the root of the object.
+
+  // We now have a FlatBuffer we can store on disk or send over a network.
+
+  // ** file/network code goes here :) **
+  // access builder.GetBufferPointer() for builder.GetSize() bytes
+
+  // Instead, we're going to access it right away (as if we just received it).
+
+  // Get access to the root:
+  auto monster = GetMonster(builder.GetBufferPointer());
+
+  // Get and test some scalar types from the FlatBuffer.
+  assert(monster->hp() == 80);
+  assert(monster->mana() == 150);  // default
+  assert(monster->name()->str() == "MyMonster");
+
+  // Get and test a field of the FlatBuffer's `struct`.
+  auto pos = monster->pos();
+  assert(pos);
+  assert(pos->z() == 3.0f);
+  (void)pos;
+
+  // Get a test an element from the `inventory` FlatBuffer's `vector`.
+  auto inv = monster->inventory();
+  assert(inv);
+  assert(inv->Get(9) == 9);
+  (void)inv;
+
+  // Get and test the `weapons` FlatBuffers's `vector`.
+  std::string expected_weapon_names[] = { "Sword", "Axe" };
+  short expected_weapon_damages[] = { 3, 5 };
+  auto weps = monster->weapons();
+  for (unsigned int i = 0; i < weps->size(); i++) {
+    assert(weps->Get(i)->name()->str() == expected_weapon_names[i]);
+    assert(weps->Get(i)->damage() == expected_weapon_damages[i]);
+  }
+  (void)expected_weapon_names;
+  (void)expected_weapon_damages;
+
+  // Get and test the `Equipment` union (`equipped` field).
+  assert(monster->equipped_type() == Equipment_Weapon);
+  auto equipped = static_cast<const Weapon *>(monster->equipped());
+  assert(equipped->name()->str() == "Axe");
+  assert(equipped->damage() == 5);
+  (void)equipped;
+
+  printf("The FlatBuffer was successfully created and verified!\n");
+}

tests/pkg_flatbuffers/monster.fbs

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+// Example IDL file for our monster's schema.
+
+namespace MyGame.Sample;
+
+enum Color:byte { Red = 0, Green, Blue = 2 }
+
+union Equipment { Weapon } // Optionally add more tables.
+
+struct Vec3 {
+  x:float;
+  y:float;
+  z:float;
+}
+
+table Monster {
+  pos:Vec3;
+  mana:short = 150;
+  hp:short = 100;
+  name:string;
+  friendly:bool = false (deprecated);
+  inventory:[ubyte];
+  color:Color = Blue;
+  weapons:[Weapon];
+  equipped:Equipment;
+  path:[Vec3];
+}
+
+table Weapon {
+  name:string;
+  damage:short;
+}
+
+root_type Monster;

tests/pkg_flatbuffers/tests/01-run.py

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+#!/usr/bin/env python3
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    child.expect_exact('The FlatBuffer was successfully created and verified!')
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))