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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/module_utils.h"
#include <atlbase.h>
#include "base/logging.h"
const wchar_t kBeaconWindowClassName[] =
L"ChromeFrameBeaconWindowClass826C5D01-E355-4b23-8AC2-40650E0B7843";
// static
ATOM DllRedirector::atom_ = 0;
bool DllRedirector::RegisterAsFirstCFModule() {
// This would imply that this module had already registered a window class
// which should never happen.
if (atom_) {
NOTREACHED();
return true;
}
WNDCLASSEX wnd_class = {0};
wnd_class.cbSize = sizeof(WNDCLASSEX);
wnd_class.style = CS_GLOBALCLASS;
wnd_class.hCursor = LoadCursor(NULL, IDC_ARROW);
wnd_class.lpszClassName = kBeaconWindowClassName;
HMODULE this_module = reinterpret_cast<HMODULE>(&__ImageBase);
wnd_class.lpfnWndProc = reinterpret_cast<WNDPROC>(this_module);
atom_ = RegisterClassEx(&wnd_class);
return (atom_ != 0);
}
void DllRedirector::UnregisterAsFirstCFModule() {
if (atom_) {
UnregisterClass(MAKEINTATOM(atom_), NULL);
atom_ = NULL;
}
}
HMODULE DllRedirector::GetFirstCFModule() {
WNDCLASSEX wnd_class = {0};
HMODULE oldest_module = NULL;
if (GetClassInfoEx(GetModuleHandle(NULL), kBeaconWindowClassName,
&wnd_class)) {
oldest_module = reinterpret_cast<HMODULE>(wnd_class.lpfnWndProc);
// Handle older versions that store module pointer in a class info.
// TODO(amit): Remove this in future versions.
if (reinterpret_cast<HMODULE>(DefWindowProc) == oldest_module) {
WNDCLASSEX wnd_class = {0};
HWND hwnd = CreateWindow(kBeaconWindowClassName, L"temp_window",
WS_POPUP, 0, 0, 0, 0, NULL, NULL, NULL, NULL);
DCHECK(IsWindow(hwnd));
if (hwnd) {
oldest_module = reinterpret_cast<HMODULE>(GetClassLongPtr(hwnd, 0));
DestroyWindow(hwnd);
}
}
}
return oldest_module;
}
LPFNGETCLASSOBJECT DllRedirector::GetDllGetClassObjectPtr(HMODULE module) {
LPFNGETCLASSOBJECT proc_ptr = NULL;
HMODULE temp_handle = 0;
// Increment the module ref count while we have an pointer to its
// DllGetClassObject function.
if (GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
reinterpret_cast<LPCTSTR>(module),
&temp_handle)) {
proc_ptr = reinterpret_cast<LPFNGETCLASSOBJECT>(
GetProcAddress(temp_handle, "DllGetClassObject"));
if (!proc_ptr) {
FreeLibrary(temp_handle);
LOG(ERROR) << "Module Scan: Couldn't get address of "
<< "DllGetClassObject: "
<< GetLastError();
}
} else {
LOG(ERROR) << "Module Scan: Could not increment module count: "
<< GetLastError();
}
return proc_ptr;
}
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