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      1 // Copyright (c) 2011 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 // This class implements a simplified and much stripped down version of
      6 // Chrome's app/resource_bundle machinery. It notably avoids unwanted
      7 // dependencies on things like Skia.
      8 //
      9 
     10 #ifndef CHROME_FRAME_SIMPLE_RESOURCE_LOADER_H_
     11 #define CHROME_FRAME_SIMPLE_RESOURCE_LOADER_H_
     12 
     13 #include <windows.h>
     14 #include <string>
     15 #include <vector>
     16 
     17 #include "base/files/file_path.h"
     18 #include "base/gtest_prod_util.h"
     19 #include "base/memory/singleton.h"
     20 
     21 namespace ui {
     22 class DataPack;
     23 }  // namespace ui
     24 
     25 class SimpleResourceLoader {
     26  public:
     27 
     28   static SimpleResourceLoader* GetInstance();
     29 
     30   // Returns the language tag for the active language.
     31   static std::wstring GetLanguage();
     32 
     33   // Helper method to return the string resource identified by message_id
     34   // from the currently loaded locale dll.
     35   static std::wstring Get(int message_id);
     36 
     37   // Retrieves the HINSTANCE of the loaded module handle. May be NULL if a
     38   // resource DLL could not be loaded.
     39   HMODULE GetResourceModuleHandle();
     40 
     41   // Retrieves the preferred languages for the current thread, adding them to
     42   // |language_tags|.
     43   static void GetPreferredLanguages(std::vector<std::wstring>* language_tags);
     44 
     45   // Populates |locales_path| with the path to the "Locales" directory.
     46   static void DetermineLocalesDirectory(base::FilePath* locales_path);
     47 
     48   // Returns false if |language_tag| is malformed.
     49   static bool IsValidLanguageTag(const std::wstring& language_tag);
     50 
     51  private:
     52   SimpleResourceLoader();
     53   ~SimpleResourceLoader();
     54 
     55   // Finds the most-preferred resource dll and language pack for the laguages
     56   // in |language_tags|
     57   // in |locales_path|.
     58   //
     59   // Returns true on success with a handle to the DLL that was loaded in
     60   // |dll_handle|, the data pack in |data_pack| and the locale language in
     61   // the |language| parameter.
     62   static bool LoadLocalePack(const std::vector<std::wstring>& language_tags,
     63                              const base::FilePath& locales_path,
     64                              HMODULE* dll_handle,
     65                              ui::DataPack** data_pack,
     66                              std::wstring* language);
     67 
     68   // Returns the string resource identified by message_id from the currently
     69   // loaded locale dll.
     70   std::wstring GetLocalizedResource(int message_id);
     71 
     72   friend struct DefaultSingletonTraits<SimpleResourceLoader>;
     73 
     74   FRIEND_TEST_ALL_PREFIXES(SimpleResourceLoaderTest, LoadLocaleDll);
     75 
     76   std::wstring language_;
     77   ui::DataPack* data_pack_;
     78 
     79   HINSTANCE locale_dll_handle_;
     80 };
     81 
     82 #endif  // CHROME_FRAME_SIMPLE_RESOURCE_LOADER_H_
     83