diff --git a/src/startup-data-util.cc b/src/startup-data-util.cc
new file mode 100644
index 0000000..4e0ad97
--- /dev/null
+++ b/src/startup-data-util.cc
@@ -0,0 +1,125 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/startup-data-util.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "src/base/logging.h"
+#include "src/base/platform/platform.h"
+#include "src/utils.h"
+
+
+namespace v8 {
+namespace internal {
+
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+
+namespace {
+
+v8::StartupData g_natives;
+v8::StartupData g_snapshot;
+
+
+void ClearStartupData(v8::StartupData* data) {
+  data->data = nullptr;
+  data->raw_size = 0;
+}
+
+
+void DeleteStartupData(v8::StartupData* data) {
+  delete[] data->data;
+  ClearStartupData(data);
+}
+
+
+void FreeStartupData() {
+  DeleteStartupData(&g_natives);
+  DeleteStartupData(&g_snapshot);
+}
+
+
+void Load(const char* blob_file, v8::StartupData* startup_data,
+          void (*setter_fn)(v8::StartupData*)) {
+  ClearStartupData(startup_data);
+
+  CHECK(blob_file);
+
+  FILE* file = fopen(blob_file, "rb");
+  if (!file) {
+    PrintF(stderr, "Failed to open startup resource '%s'.\n", blob_file);
+    return;
+  }
+
+  fseek(file, 0, SEEK_END);
+  startup_data->raw_size = static_cast<int>(ftell(file));
+  rewind(file);
+
+  startup_data->data = new char[startup_data->raw_size];
+  int read_size = static_cast<int>(fread(const_cast<char*>(startup_data->data),
+                                         1, startup_data->raw_size, file));
+  fclose(file);
+
+  if (startup_data->raw_size == read_size) {
+    (*setter_fn)(startup_data);
+  } else {
+    PrintF(stderr, "Corrupted startup resource '%s'.\n", blob_file);
+  }
+}
+
+
+void LoadFromFiles(const char* natives_blob, const char* snapshot_blob) {
+  Load(natives_blob, &g_natives, v8::V8::SetNativesDataBlob);
+  Load(snapshot_blob, &g_snapshot, v8::V8::SetSnapshotDataBlob);
+
+  atexit(&FreeStartupData);
+}
+
+
+char* RelativePath(char** buffer, const char* exec_path, const char* name) {
+  DCHECK(exec_path);
+  int path_separator = static_cast<int>(strlen(exec_path)) - 1;
+  while (path_separator >= 0 &&
+         !base::OS::isDirectorySeparator(exec_path[path_separator])) {
+    path_separator--;
+  }
+  if (path_separator >= 0) {
+    int name_length = static_cast<int>(strlen(name));
+    *buffer =
+        reinterpret_cast<char*>(calloc(path_separator + name_length + 2, 1));
+    *buffer[0] = '\0';
+    strncat(*buffer, exec_path, path_separator + 1);
+    strncat(*buffer, name, name_length);
+  } else {
+    *buffer = strdup(name);
+  }
+  return *buffer;
+}
+
+}  // namespace
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
+
+void InitializeExternalStartupData(const char* directory_path) {
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  char* natives;
+  char* snapshot;
+  LoadFromFiles(RelativePath(&natives, directory_path, "natives_blob.bin"),
+                RelativePath(&snapshot, directory_path, "snapshot_blob.bin"));
+  free(natives);
+  free(snapshot);
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+}
+
+
+void InitializeExternalStartupData(const char* natives_blob,
+                                   const char* snapshot_blob) {
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  LoadFromFiles(natives_blob, snapshot_blob);
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+}
+
+}  // namespace internal
+}  // namespace v8