plugins: move NativeLibrary into base.

NativeLibrary is used by some plugin code under chrome/.
Rather than including webkit/glue there, this relocation is the smallest
logical bite to take.  :\

Review URL: http://codereview.chromium.org/87012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14071 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 46 insertions, 0 deletions

diff --git a/base/native_library_win.cc b/base/native_library_win.cc
new file mode 100644
index 0000000..cf477fe
--- /dev/null
+++ b/base/native_library_win.cc
@@ -0,0 +1,46 @@
+// Copyright (c) 2009 The Chromium 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 "base/native_library.h"
+
+#include <windows.h>
+
+#include "base/file_path.h"
+#include "base/path_service.h"
+
+namespace base {
+
+// static
+NativeLibrary LoadNativeLibrary(const FilePath& library_path) {
+  // Switch the current directory to the library directory as the library
+  // may have dependencies on DLLs in this directory.
+  bool restore_directory = false;
+  std::wstring current_directory;
+  if (PathService::Get(base::DIR_CURRENT, &current_directory)) {
+    FilePath plugin_path = library_path.DirName();
+    if (!plugin_path.value().empty()) {
+      PathService::SetCurrentDirectory(plugin_path.value());
+      restore_directory = true;
+    }
+  }
+
+  HMODULE module = LoadLibrary(library_path.value().c_str());
+  if (restore_directory)
+    PathService::SetCurrentDirectory(current_directory);
+
+  return module;
+}
+
+// static
+void UnloadNativeLibrary(NativeLibrary library) {
+  FreeLibrary(library);
+}
+
+// static
+void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
+                                          NativeLibraryFunctionNameType name) {
+  return GetProcAddress(library, name);
+}
+
+}  // namespace base