1 files changed, 119 insertions, 0 deletions
diff --git a/onlineupdate/source/update/updater/loaddlls.cxx b/onlineupdate/source/update/updater/loaddlls.cxx
new file mode 100644
index 000000000..6a0c8a61e
--- /dev/null
+++ b/onlineupdate/source/update/updater/loaddlls.cxx
@@ -0,0 +1,119 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+#ifdef _WIN32
+#ifndef UNICODE
+#define UNICODE
+#endif
+#include <windows.h>
+
+// Delayed load libraries are loaded when the first symbol is used.
+// The following ensures that we load the delayed loaded libraries from the
+// system directory.
+struct AutoLoadSystemDependencies
+{
+    AutoLoadSystemDependencies()
+    {
+        // Remove the current directory from the search path for dynamically loaded
+        // DLLs as a precaution.  This call has no effect for delay load DLLs.
+        SetDllDirectory(L"");
+
+        HMODULE module = ::GetModuleHandleW(L"kernel32.dll");
+        if (module)
+        {
+            // SetDefaultDllDirectories is always available on Windows 8 and above. It
+            // is also available on Windows Vista, Windows Server 2008, and
+            // Windows 7 when MS KB2533623 has been applied.
+            decltype(SetDefaultDllDirectories)* setDefaultDllDirectories =
+                (decltype(SetDefaultDllDirectories)*) GetProcAddress(module, "SetDefaultDllDirectories");
+            if (setDefaultDllDirectories)
+            {
+                setDefaultDllDirectories(LOAD_LIBRARY_SEARCH_SYSTEM32);
+                return;
+            }
+        }
+
+        // TODO: moggi: do we need all that code?
+        // When SetDefaultDllDirectories is not available, fallback to preloading
+        // dlls. The order that these are loaded does not matter since they are
+        // loaded using the LOAD_WITH_ALTERED_SEARCH_PATH flag.
+#ifdef HAVE_64BIT_BUILD
+        // DLLs for Firefox x64 on Windows 7 (x64).
+        // Note: dwmapi.dll is preloaded since a crash will try to load it from the
+        // application's directory.
+        static LPCWSTR delayDLLs[] = { L"apphelp.dll",
+                                       L"cryptbase.dll",
+                                       L"cryptsp.dll",
+                                       L"dwmapi.dll",
+                                       L"mpr.dll",
+                                       L"ntmarta.dll",
+                                       L"profapi.dll",
+                                       L"propsys.dll",
+                                       L"sspicli.dll",
+                                       L"wsock32.dll"
+                                     };
+
+#else
+        // DLLs for Firefox x86 on Windows XP through Windows 7 (x86 and x64).
+        // Note: dwmapi.dll is preloaded since a crash will try to load it from the
+        // application's directory.
+        static LPCWSTR delayDLLs[] = { L"apphelp.dll",
+                                       L"crypt32.dll",
+                                       L"cryptbase.dll",
+                                       L"cryptsp.dll",
+                                       L"dwmapi.dll",
+                                       L"mpr.dll",
+                                       L"msasn1.dll",
+                                       L"ntmarta.dll",
+                                       L"profapi.dll",
+                                       L"propsys.dll",
+                                       L"psapi.dll",
+                                       L"secur32.dll",
+                                       L"sspicli.dll",
+                                       L"userenv.dll",
+                                       L"uxtheme.dll",
+                                       L"ws2_32.dll",
+                                       L"ws2help.dll",
+                                       L"wsock32.dll"
+                                     };
+#endif
+
+        WCHAR systemDirectory[MAX_PATH + 1] = { L'\0' };
+        // If GetSystemDirectory fails we accept that we'll load the DLLs from the
+        // normal search path.
+        GetSystemDirectoryW(systemDirectory, MAX_PATH + 1);
+        size_t systemDirLen = wcslen(systemDirectory);
+
+        // Make the system directory path terminate with a slash
+        if (systemDirectory[systemDirLen - 1] != L'\\' && systemDirLen)
+        {
+            systemDirectory[systemDirLen] = L'\\';
+            ++systemDirLen;
+            // No need to re-null terminate
+        }
+
+        // For each known DLL ensure it is loaded from the system32 directory
+        for (size_t i = 0; i < sizeof(delayDLLs) / sizeof(delayDLLs[0]); ++i)
+        {
+            size_t fileLen = wcslen(delayDLLs[i]);
+            wcsncpy(systemDirectory + systemDirLen, delayDLLs[i],
+                    MAX_PATH - systemDirLen);
+            if (systemDirLen + fileLen <= MAX_PATH)
+            {
+                systemDirectory[systemDirLen + fileLen] = L'\0';
+            }
+            else
+            {
+                systemDirectory[MAX_PATH] = L'\0';
+            }
+            LPCWSTR fullModulePath = systemDirectory; // just for code readability
+            // LOAD_WITH_ALTERED_SEARCH_PATH makes a dll look in its own directory for
+            // dependencies and is only available on Win 7 and below.
+            LoadLibraryExW(fullModulePath, nullptr, LOAD_WITH_ALTERED_SEARCH_PATH);
+        }
+    }
+} loadDLLs;
+#endif