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// 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, ®ion);
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);
}
HINSTANCE SimpleResourceLoader::GetResourceModuleHandle() {
return locale_dll_handle_;
}
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