Add a simple resource loader to Chrome Frame that is capable of finding, loading and extracting resources from the Chrome locale DLLs.

Add the Chrome Frame resource strings to the Chrome .grds so they get built directly into the Chrome locale dlls.

There is one remaining todo here, which is to load the dialog template into a grd + rc somewhere (probably in generated_resources.grd) and then get CF to load dialog templates from a different module. Will do that in another patch.

BUG=24305
TEST=Chrome Frame when loaded on machines whose locales are not US English will display strings appropriate to those locales.

Review URL: http://codereview.chromium.org/1240001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42423 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 136 insertions, 0 deletions

diff --git a/chrome_frame/simple_resource_loader.cc b/chrome_frame/simple_resource_loader.cc
new file mode 100644
index 0000000..2eb2167
--- /dev/null
+++ b/chrome_frame/simple_resource_loader.cc
@@ -0,0 +1,136 @@
+// Copyright (c) 2010 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 "chrome_frame/simple_resource_loader.h"
+
+#include <atlbase.h>
+#include <string>
+
+#include "base/base_paths.h"
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/path_service.h"
+#include "base/i18n/rtl.h"
+#include "base/string_util.h"
+#include "base/win_util.h"
+
+const wchar_t kLocalesDirName[] = L"Locales";
+
+HINSTANCE SimpleResourceLoader::locale_dll_handle_;
+
+SimpleResourceLoader::SimpleResourceLoader() {
+  // Find and load the resource DLL.
+  std::wstring locale = GetSystemLocale();
+  std::wstring locale_dll_path;
+
+  if (GetLocaleFilePath(locale, &locale_dll_path)) {
+    DCHECK(locale_dll_handle_ == NULL) << "Locale DLL is already loaded!";
+    locale_dll_handle_ = LoadLocaleDll(locale_dll_path);
+    DCHECK(locale_dll_handle_ != NULL) << "Failed to load locale dll!";
+  }
+}
+
+
+std::wstring SimpleResourceLoader::GetSystemLocale() {
+  std::string language, region;
+  base::i18n::GetLanguageAndRegionFromOS(&language, &region);
+  std::string ret;
+  if (!language.empty())
+    ret.append(language);
+  if (!region.empty()) {
+    ret.append("-");
+    ret.append(region);
+  }
+  return ASCIIToWide(ret);
+}
+
+bool SimpleResourceLoader::GetLocaleFilePath(const std::wstring& locale,
+                                             std::wstring* file_path) {
+  DCHECK(file_path);
+
+  FilePath module_path;
+  PathService::Get(base::DIR_MODULE, &module_path);
+  FilePath locales_path = module_path.Append(kLocalesDirName);
+
+  // We may be residing in the "locales" directory's parent, or we might be
+  // in a sibling directory. Move up one and look for Locales again in the
+  // latter case.
+  if (!file_util::DirectoryExists(locales_path)) {
+    locales_path = module_path.DirName();
+    locales_path = locales_path.Append(kLocalesDirName);
+  }
+
+  bool found_dll = false;
+  if (file_util::DirectoryExists(locales_path)) {
+    std::wstring dll_name(locale);
+    dll_name += L".dll";
+
+    // First look for the named locale DLL.
+    FilePath look_path(locales_path.Append(dll_name));
+    if (file_util::PathExists(look_path)) {
+      *file_path = look_path.value();
+      found_dll = true;
+    } else {
+
+      // If we didn't find it, try defaulting to en-US.dll.
+      dll_name = L"en-US.dll";
+      look_path = locales_path.Append(dll_name);
+      if (file_util::PathExists(look_path)) {
+        *file_path = look_path.value();
+        found_dll = true;
+      }
+    }
+  } else {
+    NOTREACHED() << "Could not locate locales DLL directory.";
+  }
+
+  return found_dll;
+}
+
+HINSTANCE SimpleResourceLoader::LoadLocaleDll(const std::wstring& dll_path) {
+  DWORD load_flags = 0;
+  if (win_util::GetWinVersion() >= win_util::WINVERSION_VISTA) {
+    load_flags = LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE |
+                 LOAD_LIBRARY_AS_IMAGE_RESOURCE;
+  } else {
+    load_flags = DONT_RESOLVE_DLL_REFERENCES;
+  }
+
+  // The dll should only have resources, not executable code.
+  HINSTANCE locale_dll_handle = LoadLibraryEx(dll_path.c_str(), NULL,
+                                              load_flags);
+  DCHECK(locale_dll_handle != NULL) << "unable to load generated resources: "
+                                     << GetLastError();
+
+  return locale_dll_handle;
+}
+
+std::wstring SimpleResourceLoader::GetLocalizedResource(int message_id) {
+  if (!locale_dll_handle_) {
+    LOG(WARNING) << "locale resources are not loaded";
+    return std::wstring();
+  }
+
+  DCHECK(IS_INTRESOURCE(message_id));
+
+  const ATLSTRINGRESOURCEIMAGE* image = AtlGetStringResourceImage(
+      locale_dll_handle_, message_id);
+  if (!image) {
+    // Fall back on the current module (shouldn't be any strings here except
+    // in unittests).
+    image = AtlGetStringResourceImage(_AtlBaseModule.GetModuleInstance(),
+                                      message_id);
+    if (!image) {
+      NOTREACHED() << "unable to find resource: " << message_id;
+      return std::wstring();
+    }
+  }
+  return std::wstring(image->achString, image->nLength);
+}
+
+// static
+std::wstring SimpleResourceLoader::Get(int message_id) {
+  SimpleResourceLoader* loader = SimpleResourceLoader::instance();
+  return loader->GetLocalizedResource(message_id);
+}