| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "win32/base/input_dll.h" |
| |
| #include "base/logging.h" |
| #include "base/util.h" |
| #include "base/win_util.h" |
| |
| namespace mozc { |
| namespace win32 { |
| |
| const wchar_t kInputDllName[] = L"input.dll"; |
| |
| const char kEnumEnabledLayoutOrTipName[] = "EnumEnabledLayoutOrTip"; |
| const char kEnumLayoutOrTipForSetup[] = "EnumLayoutOrTipForSetup"; |
| const char kInstallLayoutOrTipName[] = "InstallLayoutOrTip"; |
| const char kInstallLayoutOrTipUserRegName[] = "InstallLayoutOrTipUserReg"; |
| const char kSetDefaultLayoutOrTipName[] = "SetDefaultLayoutOrTip"; |
| |
| bool InputDll::EnsureInitialized() { |
| if (not_found_) { |
| // Previous trial was not successful. give up. |
| return false; |
| } |
| |
| if (module_ != nullptr) { |
| // Already initialized. |
| return true; |
| } |
| |
| bool lock_held = false; |
| if (!WinUtil::IsDLLSynchronizationHeld(&lock_held)) { |
| LOG(ERROR) << "IsDLLSynchronizationHeld failed."; |
| return false; |
| } |
| if (lock_held) { |
| LOG(INFO) << "This thread has loader lock. " |
| << "LoadLibrary should not be called."; |
| return false; |
| } |
| |
| const HMODULE input_dll = WinUtil::LoadSystemLibrary(kInputDllName); |
| if (input_dll == nullptr) { |
| const int last_error = ::GetLastError(); |
| DLOG(INFO) << "LoadSystemLibrary(\"" << kInputDllName << "\") failed. " |
| << "error = " << last_error; |
| if (last_error == ERROR_MOD_NOT_FOUND) { |
| not_found_ = true; |
| } |
| return false; |
| } |
| |
| enum_enabled_layout_or_tip_ = |
| reinterpret_cast<FPEnumEnabledLayoutOrTip>( |
| ::GetProcAddress(input_dll, kEnumEnabledLayoutOrTipName)); |
| |
| enum_layout_or_tip_for_setup_ = |
| reinterpret_cast<FPEnumLayoutOrTipForSetup>( |
| ::GetProcAddress(input_dll, kEnumLayoutOrTipForSetup)); |
| |
| install_layout_or_tip_ = |
| reinterpret_cast<FPInstallLayoutOrTip>( |
| ::GetProcAddress(input_dll, kInstallLayoutOrTipName)); |
| |
| install_layout_or_tip_user_reg_ = |
| reinterpret_cast<FPInstallLayoutOrTipUserReg>( |
| ::GetProcAddress(input_dll, kInstallLayoutOrTipUserRegName)); |
| |
| set_default_layout_or_tip_ = |
| reinterpret_cast<FPSetDefaultLayoutOrTip>( |
| ::GetProcAddress(input_dll, kSetDefaultLayoutOrTipName)); |
| |
| // Other threads may load the same DLL concurrently. |
| // Check if this thread is the first thread which updated the |module_|. |
| const HMODULE original = static_cast<HMODULE>( |
| ::InterlockedCompareExchangePointer( |
| reinterpret_cast<volatile PVOID *>(&module_), input_dll, nullptr)); |
| if (original == nullptr) { |
| // This is the first thread which updated the |module_| with valid handle. |
| // Do not call FreeLibrary to keep the reference count positive. |
| } else { |
| // |module_| has already been updated by another thread. Call FreeLibrary |
| // to decrement the reference count which this thread owns. |
| ::FreeLibrary(input_dll); |
| } |
| |
| return true; |
| } |
| |
| InputDll::FPEnumEnabledLayoutOrTip InputDll::enum_enabled_layout_or_tip() { |
| return enum_enabled_layout_or_tip_; |
| } |
| |
| InputDll::FPEnumLayoutOrTipForSetup InputDll::enum_layout_or_tip_for_setup() { |
| return enum_layout_or_tip_for_setup_; |
| } |
| |
| InputDll::FPInstallLayoutOrTip InputDll::install_layout_or_tip() { |
| return install_layout_or_tip_; |
| } |
| |
| InputDll::FPInstallLayoutOrTipUserReg |
| InputDll::install_layout_or_tip_user_reg() { |
| return install_layout_or_tip_user_reg_; |
| } |
| |
| InputDll::FPSetDefaultLayoutOrTip InputDll::set_default_layout_or_tip() { |
| return set_default_layout_or_tip_; |
| } |
| |
| bool InputDll::not_found_; |
| |
| volatile HMODULE InputDll::module_; |
| InputDll::FPEnumEnabledLayoutOrTip InputDll::enum_enabled_layout_or_tip_; |
| InputDll::FPEnumLayoutOrTipForSetup InputDll::enum_layout_or_tip_for_setup_; |
| InputDll::FPInstallLayoutOrTip InputDll::install_layout_or_tip_; |
| InputDll::FPInstallLayoutOrTipUserReg |
| InputDll::install_layout_or_tip_user_reg_; |
| InputDll::FPSetDefaultLayoutOrTip InputDll::set_default_layout_or_tip_; |
| |
| } // namespace win32 |
| } // namespace mozc |