diff --git a/src/util.cpp b/src/util.cpp
new file mode 100644
index 0000000..5483cee
--- /dev/null
+++ b/src/util.cpp
@@ -0,0 +1,275 @@
+/*
+ * Copyright 2016 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.
+ */
+
+// clang-format off
+// Dont't remove `format off`, it prevent reordering of win-includes.
+#ifdef _WIN32
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#  ifndef NOMINMAX
+#    define NOMINMAX
+#  endif
+#  ifdef _MSC_VER
+#    include <crtdbg.h>
+#  endif
+#  include <windows.h>  // Must be included before <direct.h>
+#  include <direct.h>
+#  include <winbase.h>
+#  undef interface  // This is also important because of reasons
+#else
+#  include <limits.h>
+#endif
+// clang-format on
+
+#include "flatbuffers/base.h"
+#include "flatbuffers/util.h"
+
+#include <sys/stat.h>
+#include <clocale>
+#include <fstream>
+
+namespace flatbuffers {
+
+bool FileExistsRaw(const char *name) {
+  std::ifstream ifs(name);
+  return ifs.good();
+}
+
+bool LoadFileRaw(const char *name, bool binary, std::string *buf) {
+  if (DirExists(name)) return false;
+  std::ifstream ifs(name, binary ? std::ifstream::binary : std::ifstream::in);
+  if (!ifs.is_open()) return false;
+  if (binary) {
+    // The fastest way to read a file into a string.
+    ifs.seekg(0, std::ios::end);
+    auto size = ifs.tellg();
+    (*buf).resize(static_cast<size_t>(size));
+    ifs.seekg(0, std::ios::beg);
+    ifs.read(&(*buf)[0], (*buf).size());
+  } else {
+    // This is slower, but works correctly on all platforms for text files.
+    std::ostringstream oss;
+    oss << ifs.rdbuf();
+    *buf = oss.str();
+  }
+  return !ifs.bad();
+}
+
+static LoadFileFunction g_load_file_function = LoadFileRaw;
+static FileExistsFunction g_file_exists_function = FileExistsRaw;
+
+bool LoadFile(const char *name, bool binary, std::string *buf) {
+  FLATBUFFERS_ASSERT(g_load_file_function);
+  return g_load_file_function(name, binary, buf);
+}
+
+bool FileExists(const char *name) {
+  FLATBUFFERS_ASSERT(g_file_exists_function);
+  return g_file_exists_function(name);
+}
+
+bool DirExists(const char *name) {
+  // clang-format off
+
+  #ifdef _WIN32
+    #define flatbuffers_stat _stat
+    #define FLATBUFFERS_S_IFDIR _S_IFDIR
+  #else
+    #define flatbuffers_stat stat
+    #define FLATBUFFERS_S_IFDIR S_IFDIR
+  #endif
+  // clang-format on
+  struct flatbuffers_stat file_info;
+  if (flatbuffers_stat(name, &file_info) != 0) return false;
+  return (file_info.st_mode & FLATBUFFERS_S_IFDIR) != 0;
+}
+
+LoadFileFunction SetLoadFileFunction(LoadFileFunction load_file_function) {
+  LoadFileFunction previous_function = g_load_file_function;
+  g_load_file_function = load_file_function ? load_file_function : LoadFileRaw;
+  return previous_function;
+}
+
+FileExistsFunction SetFileExistsFunction(
+    FileExistsFunction file_exists_function) {
+  FileExistsFunction previous_function = g_file_exists_function;
+  g_file_exists_function =
+      file_exists_function ? file_exists_function : FileExistsRaw;
+  return previous_function;
+}
+
+bool SaveFile(const char *name, const char *buf, size_t len, bool binary) {
+  std::ofstream ofs(name, binary ? std::ofstream::binary : std::ofstream::out);
+  if (!ofs.is_open()) return false;
+  ofs.write(buf, len);
+  return !ofs.bad();
+}
+
+// We internally store paths in posix format ('/'). Paths supplied
+// by the user should go through PosixPath to ensure correct behavior
+// on Windows when paths are string-compared.
+
+static const char kPathSeparatorWindows = '\\';
+static const char *PathSeparatorSet = "\\/";  // Intentionally no ':'
+
+std::string StripExtension(const std::string &filepath) {
+  size_t i = filepath.find_last_of('.');
+  return i != std::string::npos ? filepath.substr(0, i) : filepath;
+}
+
+std::string GetExtension(const std::string &filepath) {
+  size_t i = filepath.find_last_of('.');
+  return i != std::string::npos ? filepath.substr(i + 1) : "";
+}
+
+std::string StripPath(const std::string &filepath) {
+  size_t i = filepath.find_last_of(PathSeparatorSet);
+  return i != std::string::npos ? filepath.substr(i + 1) : filepath;
+}
+
+std::string StripFileName(const std::string &filepath) {
+  size_t i = filepath.find_last_of(PathSeparatorSet);
+  return i != std::string::npos ? filepath.substr(0, i) : "";
+}
+
+std::string ConCatPathFileName(const std::string &path,
+                               const std::string &filename) {
+  std::string filepath = path;
+  if (filepath.length()) {
+    char &filepath_last_character = string_back(filepath);
+    if (filepath_last_character == kPathSeparatorWindows) {
+      filepath_last_character = kPathSeparator;
+    } else if (filepath_last_character != kPathSeparator) {
+      filepath += kPathSeparator;
+    }
+  }
+  filepath += filename;
+  // Ignore './' at the start of filepath.
+  if (filepath[0] == '.' && filepath[1] == kPathSeparator) {
+    filepath.erase(0, 2);
+  }
+  return filepath;
+}
+
+std::string PosixPath(const char *path) {
+  std::string p = path;
+  std::replace(p.begin(), p.end(), '\\', '/');
+  return p;
+}
+
+void EnsureDirExists(const std::string &filepath) {
+  auto parent = StripFileName(filepath);
+  if (parent.length()) EnsureDirExists(parent);
+    // clang-format off
+
+  #ifdef _WIN32
+    (void)_mkdir(filepath.c_str());
+  #else
+    mkdir(filepath.c_str(), S_IRWXU|S_IRGRP|S_IXGRP);
+  #endif
+  // clang-format on
+}
+
+std::string AbsolutePath(const std::string &filepath) {
+  // clang-format off
+
+  #ifdef FLATBUFFERS_NO_ABSOLUTE_PATH_RESOLUTION
+    return filepath;
+  #else
+    #ifdef _WIN32
+      char abs_path[MAX_PATH];
+      return GetFullPathNameA(filepath.c_str(), MAX_PATH, abs_path, nullptr)
+    #else
+      char abs_path[PATH_MAX];
+      return realpath(filepath.c_str(), abs_path)
+    #endif
+      ? abs_path
+      : filepath;
+  #endif // FLATBUFFERS_NO_ABSOLUTE_PATH_RESOLUTION
+  // clang-format on
+}
+
+// Locale-independent code.
+#if defined(FLATBUFFERS_LOCALE_INDEPENDENT) && \
+    (FLATBUFFERS_LOCALE_INDEPENDENT > 0)
+
+// clang-format off
+// Allocate locale instance at startup of application.
+ClassicLocale ClassicLocale::instance_;
+
+#ifdef _MSC_VER
+  ClassicLocale::ClassicLocale()
+    : locale_(_create_locale(LC_ALL, "C")) {}
+  ClassicLocale::~ClassicLocale() { _free_locale(locale_); }
+#else
+  ClassicLocale::ClassicLocale()
+    : locale_(newlocale(LC_ALL, "C", nullptr)) {}
+  ClassicLocale::~ClassicLocale() { freelocale(locale_); }
+#endif
+// clang-format on
+
+#endif  // !FLATBUFFERS_LOCALE_INDEPENDENT
+
+std::string RemoveStringQuotes(const std::string &s) {
+  auto ch = *s.c_str();
+  return ((s.size() >= 2) && (ch == '\"' || ch == '\'') &&
+          (ch == string_back(s)))
+             ? s.substr(1, s.length() - 2)
+             : s;
+}
+
+bool SetGlobalTestLocale(const char *locale_name, std::string *_value) {
+  const auto the_locale = setlocale(LC_ALL, locale_name);
+  if (!the_locale) return false;
+  if (_value) *_value = std::string(the_locale);
+  return true;
+}
+
+bool ReadEnvironmentVariable(const char *var_name, std::string *_value) {
+  #ifdef _MSC_VER
+  __pragma(warning(disable : 4996)); // _CRT_SECURE_NO_WARNINGS
+  #endif
+  auto env_str = std::getenv(var_name);
+  if (!env_str) return false;
+  if (_value) *_value = std::string(env_str);
+  return true;
+}
+
+void SetupDefaultCRTReportMode() {
+  // clang-format off
+
+  #ifdef _MSC_VER
+    // By default, send all reports to STDOUT to prevent CI hangs.
+    // Enable assert report box [Abort|Retry|Ignore] if a debugger is present.
+    const int dbg_mode = (_CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG) |
+                         (IsDebuggerPresent() ? _CRTDBG_MODE_WNDW : 0);
+    (void)dbg_mode; // release mode fix
+    // CrtDebug reports to _CRT_WARN channel.
+    _CrtSetReportMode(_CRT_WARN, dbg_mode);
+    _CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDOUT);
+    // The assert from <assert.h> reports to _CRT_ERROR channel
+    _CrtSetReportMode(_CRT_ERROR, dbg_mode);
+    _CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDOUT);
+    // Internal CRT assert channel?
+    _CrtSetReportMode(_CRT_ASSERT, dbg_mode);
+    _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDOUT);
+  #endif
+
+  // clang-format on
+}
+
+}  // namespace flatbuffers