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89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/native_library.h"
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#include <windows.h>
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#include "base/files/file_util.h"
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#include "base/strings/stringprintf.h"
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#include "base/strings/utf_string_conversions.h"
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#include "base/threading/thread_restrictions.h"
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namespace base {
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typedef HMODULE (WINAPI* LoadLibraryFunction)(const wchar_t* file_name);
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namespace {
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NativeLibrary LoadNativeLibraryHelper(const FilePath& library_path,
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LoadLibraryFunction load_library_api,
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NativeLibraryLoadError* error) {
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// LoadLibrary() opens the file off disk.
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ThreadRestrictions::AssertIOAllowed();
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// Switch the current directory to the library directory as the library
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// may have dependencies on DLLs in this directory.
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bool restore_directory = false;
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FilePath current_directory;
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if (GetCurrentDirectory(¤t_directory)) {
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FilePath plugin_path = library_path.DirName();
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if (!plugin_path.empty()) {
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SetCurrentDirectory(plugin_path);
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restore_directory = true;
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}
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}
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HMODULE module = (*load_library_api)(library_path.value().c_str());
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if (!module && error) {
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// GetLastError() needs to be called immediately after |load_library_api|.
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error->code = GetLastError();
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}
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if (restore_directory)
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SetCurrentDirectory(current_directory);
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return module;
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}
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} // namespace
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std::string NativeLibraryLoadError::ToString() const {
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return StringPrintf("%u", code);
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}
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// static
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NativeLibrary LoadNativeLibrary(const FilePath& library_path,
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NativeLibraryLoadError* error) {
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return LoadNativeLibraryHelper(library_path, LoadLibraryW, error);
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}
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NativeLibrary LoadNativeLibraryDynamically(const FilePath& library_path) {
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typedef HMODULE (WINAPI* LoadLibraryFunction)(const wchar_t* file_name);
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LoadLibraryFunction load_library;
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load_library = reinterpret_cast<LoadLibraryFunction>(
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GetProcAddress(GetModuleHandle(L"kernel32.dll"), "LoadLibraryW"));
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return LoadNativeLibraryHelper(library_path, load_library, NULL);
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}
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// static
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void UnloadNativeLibrary(NativeLibrary library) {
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FreeLibrary(library);
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}
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// static
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void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
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const char* name) {
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return GetProcAddress(library, name);
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}
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// static
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string16 GetNativeLibraryName(const string16& name) {
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return name + ASCIIToUTF16(".dll");
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}
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} // namespace base
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