Resurrect the cloud printer driver.

cloud_print/virtual_driver/win/port_monitor/port_monitor_dll.cc

Index: cloud_print/virtual_driver/win/port_monitor/port_monitor_dll.cc
diff --git a/cloud_print/virtual_driver/win/port_monitor/port_monitor_dll.cc b/cloud_print/virtual_driver/win/port_monitor/port_monitor_dll.cc
new file mode 100644
index 0000000000000000000000000000000000000000..66039bc986caff63380319774023e069ef2f5849
--- /dev/null
+++ b/cloud_print/virtual_driver/win/port_monitor/port_monitor_dll.cc
@@ -0,0 +1,96 @@
+// Copyright (c) 2012 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 "cloud_print/virtual_driver/win/port_monitor/port_monitor.h"
+
+#include <windows.h>
+#include <lmcons.h>
+#include <shellapi.h>
+#include <shlobj.h>
+#include <strsafe.h>
+#include <userenv.h>
+#include <winspool.h>
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/process/process_info.h"
+#include "base/strings/string16.h"
+#include "base/win/registry.h"
+#include "base/win/scoped_handle.h"
+#include "base/win/windows_version.h"
+#include "chrome/common/chrome_switches.h"
+#include "cloud_print/common/win/cloud_print_utils.h"
+#include "cloud_print/virtual_driver/win/port_monitor/spooler_win.h"
+#include "cloud_print/virtual_driver/win/virtual_driver_consts.h"
+#include "cloud_print/virtual_driver/win/virtual_driver_helpers.h"
+
+namespace cloud_print {
+
+const wchar_t kChromeExePath[] = L"google\\chrome\\application\\chrome.exe";
+const wchar_t kChromeExePathRegValue[] = L"PathToChromeExe";
+const wchar_t kChromeProfilePathRegValue[] = L"PathToChromeProfile";
+const wchar_t kPrintCommandRegValue[] = L"PrintCommand";
+const bool kIsUnittest = false;
+
+namespace {
+
+// Returns true if Xps support is installed.
+bool XpsIsInstalled() {
+  base::FilePath xps_path;
+  if (!SUCCEEDED(GetPrinterDriverDir(&xps_path))) {
+    return false;
+  }
+  xps_path = xps_path.Append(L"mxdwdrv.dll");
+  if (!base::PathExists(xps_path)) {
+    return false;
+  }
+  return true;
+}
+
+// Returns true if registration/unregistration can be attempted.
+bool CanRegister() {
+  if (!XpsIsInstalled()) {
+    return false;
+  }
+  if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
+    if (base::GetCurrentProcessIntegrityLevel() != base::HIGH_INTEGRITY)
+      return false;
+  }
+  return true;
+}
+
+}  // namespace
+
+}  // namespace cloud_print
+
+HRESULT WINAPI DllRegisterServer(void) {
+  base::AtExitManager at_exit_manager;
+  if (!cloud_print::CanRegister()) {
+    return E_ACCESSDENIED;
+  }
+  MONITOR_INFO_2 monitor_info = {0};
+  // YUCK!!!  I can either copy the constant, const_cast, or define my own
+  // MONITOR_INFO_2 that will take const strings.
+  base::FilePath dll_path(L"gcp_portmon.dll");
+  monitor_info.pDLLName = const_cast<LPWSTR>(dll_path.value().c_str());
+  monitor_info.pName = const_cast<LPWSTR>(dll_path.value().c_str());
+  if (AddMonitor(NULL, 2, reinterpret_cast<BYTE*>(&monitor_info))) {
+    return S_OK;
+  }
+  return cloud_print::GetLastHResult();
+}
+
+HRESULT WINAPI DllUnregisterServer(void) {
+  base::AtExitManager at_exit_manager;
+  if (!cloud_print::CanRegister()) {
+    return E_ACCESSDENIED;
+  }
+  base::FilePath dll_path(L"gcp_portmon.dll");
+  if (DeleteMonitor(NULL, NULL, const_cast<LPWSTR>(dll_path.value().c_str()))) {
+    return S_OK;
+  }
+  return cloud_print::GetLastHResult();
+}