1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 // AdbWinApi.cpp : Implementation of DLL Exports.
18
19 #include "stdafx.h"
20 #include "adb_api.h"
21 #include "adb_winusb_api.h"
22
23 extern "C" {
24 int _forceCRTManifest;
25 int _forceMFCManifest;
26 int _forceAtlDllManifest;
27 };
28
29 /// References InstantiateWinUsbInterface declared in adb_api.cpp
30 extern PFN_INSTWINUSBINTERFACE InstantiateWinUsbInterface;
31
32 class CAdbWinApiModule : public CAtlDllModuleT< CAdbWinApiModule > {
33 public:
CAdbWinApiModule()34 CAdbWinApiModule()
35 : CAtlDllModuleT< CAdbWinApiModule >(),
36 adbwinusbapi_handle_(NULL),
37 is_initialized_(false) {
38 }
39
~CAdbWinApiModule()40 ~CAdbWinApiModule() {
41 // Unload AdbWinUsbApi.dll before we exit
42 if (NULL != adbwinusbapi_handle_) {
43 FreeLibrary(adbwinusbapi_handle_);
44 }
45 }
46
47 /** \brief Loads AdbWinUsbApi.dll and caches its InstantiateWinUsbInterface
48 export.
49
50 This method is called from DllMain on DLL_PROCESS_ATTACH event. In this
51 method we will check if WINUSB.DLL required by AdbWinUsbApi.dll is
52 installed, and if it is we will load AdbWinUsbApi.dll and cache address of
53 InstantiateWinUsbInterface routine exported from AdbWinUsbApi.dll
54 */
AttachToAdbWinUsbApi()55 void AttachToAdbWinUsbApi() {
56 // We only need to run this only once.
57 if (is_initialized_) {
58 return;
59 }
60
61 // Just mark that we have ran initialization.
62 is_initialized_ = true;
63
64 // Before we can load AdbWinUsbApi.dll we must make sure that WINUSB.DLL
65 // has been installed. Build path to the file.
66 wchar_t path_to_winusb_dll[MAX_PATH+1];
67 if (!GetSystemDirectory(path_to_winusb_dll, MAX_PATH)) {
68 return;
69 }
70 wcscat(path_to_winusb_dll, L"\\WINUSB.DLL");
71
72 if (0xFFFFFFFF == GetFileAttributes(path_to_winusb_dll)) {
73 // WINUSB.DLL is not installed. We don't (in fact, can't) load
74 // AdbWinUsbApi.dll
75 return;
76 }
77
78 // WINUSB.DLL is installed. Lets load AdbWinUsbApi.dll and cache its
79 // InstantiateWinUsbInterface export.
80 // We require that AdbWinUsbApi.dll is located in the same folder
81 // where AdbWinApi.dll and adb.exe are located, so by Windows
82 // conventions we can pass just module name, and not the full path.
83 adbwinusbapi_handle_ = LoadLibrary(L"AdbWinUsbApi.dll");
84 if (NULL != adbwinusbapi_handle_) {
85 InstantiateWinUsbInterface = reinterpret_cast<PFN_INSTWINUSBINTERFACE>
86 (GetProcAddress(adbwinusbapi_handle_, "InstantiateWinUsbInterface"));
87 }
88 }
89
90 protected:
91 /// Handle to the loaded AdbWinUsbApi.dll
92 HINSTANCE adbwinusbapi_handle_;
93
94 /// Flags whether or not this module has been initialized.
95 bool is_initialized_;
96 };
97
98 CAdbWinApiModule _AtlModule;
99
100 // DLL Entry Point
DllMain(HINSTANCE instance,DWORD reason,LPVOID reserved)101 extern "C" BOOL WINAPI DllMain(HINSTANCE instance,
102 DWORD reason,
103 LPVOID reserved) {
104 // Lets see if we need to initialize InstantiateWinUsbInterface
105 // variable. We do that only once, on condition that this DLL is
106 // being attached to the process and InstantiateWinUsbInterface
107 // address has not been calculated yet.
108 if (DLL_PROCESS_ATTACH == reason) {
109 _AtlModule.AttachToAdbWinUsbApi();
110 }
111 return _AtlModule.DllMain(reason, reserved);
112 }
113