native_library_win.cc revision 4a5e2dc747d50c653511c68ccb2cfbfb740bd5a7 
1// Copyright (c) 2009 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/native_library.h"
6
7#include <windows.h>
8
9#include "base/file_util.h"
10#include "base/thread_restrictions.h"
11#include "base/utf_string_conversions.h"
12
13namespace base {
14
15// static
16NativeLibrary LoadNativeLibrary(const FilePath& library_path) {
17  // LoadLibrary() opens the file off disk.
18  base::ThreadRestrictions::AssertIOAllowed();
19
20  // Switch the current directory to the library directory as the library
21  // may have dependencies on DLLs in this directory.
22  bool restore_directory = false;
23  FilePath current_directory;
24  if (file_util::GetCurrentDirectory(&current_directory)) {
25    FilePath plugin_path = library_path.DirName();
26    if (!plugin_path.empty()) {
27      file_util::SetCurrentDirectory(plugin_path);
28      restore_directory = true;
29    }
30  }
31
32  HMODULE module = LoadLibrary(library_path.value().c_str());
33  if (restore_directory)
34    file_util::SetCurrentDirectory(current_directory);
35
36  return module;
37}
38
39// static
40void UnloadNativeLibrary(NativeLibrary library) {
41  FreeLibrary(library);
42}
43
44// static
45void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
46                                          const char* name) {
47  return GetProcAddress(library, name);
48}
49
50// static
51string16 GetNativeLibraryName(const string16& name) {
52  return name + ASCIIToUTF16(".dll");
53}
54
55}  // namespace base
56