add flatbuffers

commit 6da1cf79d90eb242e7da5318241d42279a3df3ba
Author: Max Burke <max@urbanlogiq.com>
Date:   Sun Jan 19 14:47:28 2020 -0800

    [rust] Add use declarations to Rust-generated bindings for imported FB definitions (#5645)

    * Bugfix for Rust generation of union fields named with language keywords

flatbuffers/samples/sample_bfbs.cpp

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2014 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 "flatbuffers/idl.h"
+#include "flatbuffers/util.h"
+#include "monster_generated.h"  // Already includes "flatbuffers/flatbuffers.h".
+
+using namespace MyGame::Sample;
+
+// This is an example of parsing text straight into a buffer and then
+// generating flatbuffer (JSON) text from the buffer.
+int main(int /*argc*/, const char * /*argv*/[]) {
+  // load FlatBuffer schema (.fbs) and JSON from disk
+  std::string schema_file;
+  std::string json_file;
+  std::string bfbs_file;
+  bool ok =
+      flatbuffers::LoadFile("tests/monster_test.fbs", false, &schema_file) &&
+      flatbuffers::LoadFile("tests/monsterdata_test.golden", false,
+                            &json_file) &&
+      flatbuffers::LoadFile("tests/monster_test.bfbs", true, &bfbs_file);
+  if (!ok) {
+    printf("couldn't load files!\n");
+    return 1;
+  }
+
+  const char *include_directories[] = { "samples", "tests",
+                                        "tests/include_test", nullptr };
+  // parse fbs schema
+  flatbuffers::Parser parser1;
+  ok = parser1.Parse(schema_file.c_str(), include_directories);
+  assert(ok);
+
+  // inizialize parser by deserializing bfbs schema
+  flatbuffers::Parser parser2;
+  ok = parser2.Deserialize((uint8_t *)bfbs_file.c_str(), bfbs_file.length());
+  assert(ok);
+
+  // parse json in parser from fbs and bfbs
+  ok = parser1.Parse(json_file.c_str(), include_directories);
+  assert(ok);
+  ok = parser2.Parse(json_file.c_str(), include_directories);
+  assert(ok);
+
+  // to ensure it is correct, we now generate text back from the binary,
+  // and compare the two:
+  std::string jsongen1;
+  if (!GenerateText(parser1, parser1.builder_.GetBufferPointer(), &jsongen1)) {
+    printf("Couldn't serialize parsed data to JSON!\n");
+    return 1;
+  }
+
+  std::string jsongen2;
+  if (!GenerateText(parser2, parser2.builder_.GetBufferPointer(), &jsongen2)) {
+    printf("Couldn't serialize parsed data to JSON!\n");
+    return 1;
+  }
+
+  if (jsongen1 != jsongen2) {
+    printf("%s----------------\n%s", jsongen1.c_str(), jsongen2.c_str());
+  }
+
+  printf("The FlatBuffer has been parsed from JSON successfully.\n");
+}