Delay loading GetCurrentPackageFullName

MSIX only anyways

Author: K4sum1

browser/components/shell/WindowsUserChoice.cpp

@@ -28,6 +28,7 @@
 
 #include "nsDebug.h"
 #include "mozilla/ArrayUtils.h"
+#include "mozilla/DynamicallyLinkedFunctionPtr.h"
 #include "mozilla/UniquePtr.h"
 #include "nsWindowsHelpers.h"
 
@@ -429,12 +430,20 @@ nsresult GetMsixProgId(const wchar_t* assoc, UniquePtr<wchar_t[]>& aProgId) {
   // HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages\[Package Full Name]\App\Capabilities\[FileAssociations | URLAssociations]\[File | URL]
   // clang-format on
 
+  // `GetCurrentPackageFullName` added in Windows 8.
+  DynamicallyLinkedFunctionPtr<decltype(&GetCurrentPackageFullName)>
+      pGetCurrentPackageFullName(L"kernel32.dll",
+                                        "GetCurrentPackageFullName");
+  if (!pGetCurrentPackageFullName) {
+    return NS_OK;
+  }
+  
   UINT32 pfnLen = 0;
-  LONG rv = GetCurrentPackageFullName(&pfnLen, nullptr);
+  LONG rv = pGetCurrentPackageFullName(&pfnLen, nullptr);
   NS_ENSURE_TRUE(rv != APPMODEL_ERROR_NO_PACKAGE, NS_ERROR_FAILURE);
 
   auto pfn = mozilla::MakeUnique<wchar_t[]>(pfnLen);
-  rv = GetCurrentPackageFullName(&pfnLen, pfn.get());
+  rv = pGetCurrentPackageFullName(&pfnLen, pfn.get());
   NS_ENSURE_TRUE(rv == ERROR_SUCCESS, NS_ERROR_FAILURE);
 
   const wchar_t* assocSuffix;

toolkit/mozapps/defaultagent/SetDefaultBrowser.cpp

@@ -11,6 +11,7 @@
 
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/CmdLineAndEnvUtils.h"
+#include "mozilla/DynamicallyLinkedFunctionPtr.h"
 #include "mozilla/RefPtr.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/WindowsVersion.h"
@@ -301,10 +302,19 @@ nsresult SetDefaultExtensionHandlersUserChoice(
 nsresult SetDefaultExtensionHandlersUserChoiceImpl(
     const wchar_t* aAumi, const wchar_t* const aSid,
     const nsTArray<nsString>& aFileExtensions) {
+	
+  // `GetCurrentPackageFullName` added in Windows 8.
+  DynamicallyLinkedFunctionPtr<decltype(&GetCurrentPackageFullName)>
+      pGetCurrentPackageFullName(L"kernel32.dll",
+                                        "GetCurrentPackageFullName");
+  if (!pGetCurrentPackageFullName) {
+    return NS_OK;
+  }
+  
   UINT32 pfnLen = 0;
   bool inMsix =
-      GetCurrentPackageFullName(&pfnLen, nullptr) != APPMODEL_ERROR_NO_PACKAGE;
-
+      pGetCurrentPackageFullName(&pfnLen, nullptr) != APPMODEL_ERROR_NO_PACKAGE;
+	  
   if (inMsix) {
     // MSIX packages can not meaningfully modify the registry keys related to
     // default handlers