Move Updater to WinUpdater

Source/Core/WinUpdater/Main.cpp

@@ -0,0 +1,82 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <windows.h>
+#include <ShlObj.h>
+#include <shellapi.h>
+
+#include <string>
+#include <vector>
+
+#include "Common/StringUtil.h"
+
+#include "UpdaterCommon/UI.h"
+#include "UpdaterCommon/UpdaterCommon.h"
+
+namespace
+{
+std::vector<std::string> CommandLineToUtf8Argv(PCWSTR command_line)
+{
+  int nargs;
+  LPWSTR* tokenized = CommandLineToArgvW(command_line, &nargs);
+  if (!tokenized)
+    return {};
+
+  std::vector<std::string> argv(nargs);
+  for (int i = 0; i < nargs; ++i)
+  {
+    argv[i] = UTF16ToUTF8(tokenized[i]);
+  }
+
+  LocalFree(tokenized);
+  return argv;
+}
+};  // namespace
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow)
+{
+  if (lstrlenW(pCmdLine) == 0)
+  {
+    MessageBox(nullptr,
+               L"This updater is not meant to be launched directly. Configure Auto-Update in "
+               "Dolphin's settings instead.",
+               L"Error", MB_ICONERROR);
+    return 1;
+  }
+
+  // Test for write permissions
+  bool need_admin = false;
+
+  FILE* test_fh = fopen("Updater.log", "w");
+
+  if (test_fh == nullptr)
+    need_admin = true;
+  else
+    fclose(test_fh);
+
+  if (need_admin)
+  {
+    if (IsUserAnAdmin())
+    {
+      MessageBox(nullptr, L"Failed to write to directory despite administrator priviliges.",
+                 L"Error", MB_ICONERROR);
+      return 1;
+    }
+
+    wchar_t path[MAX_PATH];
+    if (GetModuleFileName(hInstance, path, sizeof(path)) == 0)
+    {
+      MessageBox(nullptr, L"Failed to get updater filename.", L"Error", MB_ICONERROR);
+      return 1;
+    }
+
+    // Relaunch the updater as administrator
+    ShellExecuteW(nullptr, L"runas", path, pCmdLine, NULL, SW_SHOW);
+    return 0;
+  }
+
+  std::vector<std::string> args = CommandLineToUtf8Argv(pCmdLine);
+
+  return RunUpdater(args) ? 0 : 1;
+}