Move GetsOrCreateAsarArchive to asar_util.h

atom/common/asar/asar_util.cc

@@ -0,0 +1,35 @@
+// Copyright (c) 2015 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/asar/asar_util.h"
+
+#include <map>
+
+#include "atom/common/asar/archive.h"
+#include "base/files/file_path.h"
+#include "base/lazy_instance.h"
+#include "base/stl_util.h"
+
+namespace asar {
+
+typedef std::map<base::FilePath, std::shared_ptr<Archive>> ArchiveMap;
+
+namespace {
+
+static base::LazyInstance<ArchiveMap> g_archive_map = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+std::shared_ptr<Archive> GetOrCreateAsarArchive(const base::FilePath& path) {
+  ArchiveMap& archive_map = *g_archive_map.Pointer();
+  if (!ContainsKey(archive_map, path)) {
+    std::shared_ptr<Archive> archive(new Archive(path));
+    if (!archive->Init())
+      return nullptr;
+    archive_map[path] = archive;
+  }
+  return archive_map[path];
+}
+
+}  // namespace asar