add launcher.dll proxy option

1 files changed, 114 insertions, 0 deletions

diff --git a/loader_launcher_proxy/dllmain.cpp b/loader_launcher_proxy/dllmain.cpp
new file mode 100644
index 00000000..6e0d1f07
--- /dev/null
+++ b/loader_launcher_proxy/dllmain.cpp
@@ -0,0 +1,114 @@
+#include "pch.h"
+#include <stdio.h>
+#include <string>
+#include <system_error>
+#include <Shlwapi.h>
+
+HMODULE hLauncherModule;
+HMODULE hHookModule;
+
+using CreateInterfaceFn = void* (*)(const char* pName, int* pReturnCode);
+
+// does not seem to ever be used
+extern "C" _declspec(dllexport) void* __fastcall CreateInterface(const char* pName, int* pReturnCode)
+{
+    //AppSystemCreateInterfaceFn(pName, pReturnCode);
+    printf("external CreateInterface: name: %s\n", pName);
+
+    static CreateInterfaceFn launcher_CreateInterface = (CreateInterfaceFn)GetProcAddress(hLauncherModule, "CreateInterface");
+    auto res = launcher_CreateInterface(pName, pReturnCode);
+
+    printf("external CreateInterface: return code: %p\n", res);
+    return res;
+}
+
+bool GetExePathWide(wchar_t* dest, size_t destSize)
+{
+    if (!dest) return NULL;
+    if (destSize < MAX_PATH) return NULL;
+
+    DWORD length = GetModuleFileNameW(NULL, dest, destSize);
+    return length && PathRemoveFileSpecW(dest);
+}
+
+FARPROC GetLauncherMain()
+{
+    static FARPROC Launcher_LauncherMain;
+    if (!Launcher_LauncherMain)
+        Launcher_LauncherMain = GetProcAddress(hLauncherModule, "LauncherMain");
+    return Launcher_LauncherMain;
+}
+
+void LibraryLoadError(DWORD dwMessageId, const wchar_t* libName, const wchar_t* location)
+{
+    char text[2048];
+    std::string message = std::system_category().message(dwMessageId); 
+    sprintf_s(text, "Failed to load the %ls at \"%ls\" (%lu):\n\n%hs", libName, location, dwMessageId, message.c_str());
+    MessageBoxA(GetForegroundWindow(), text, "Launcher Error", 0);
+}
+
+BOOL APIENTRY DllMain( HMODULE hModule,
+                       DWORD  ul_reason_for_call,
+                       LPVOID lpReserved
+                     )
+{
+    switch (ul_reason_for_call)
+    {
+    case DLL_PROCESS_ATTACH:
+    case DLL_THREAD_ATTACH:
+    case DLL_THREAD_DETACH:
+    case DLL_PROCESS_DETACH:
+        break;
+    }
+    return TRUE;
+}
+
+wchar_t exePath[4096];
+wchar_t dllPath[4096];
+
+extern "C" _declspec(dllexport) void LauncherMain(__int64, __int64, __int64, uint32_t)
+{
+    {
+
+        if (!GetExePathWide(exePath, 4096))
+        {
+            MessageBoxA(GetForegroundWindow(), "Failed getting game directory.\nThe game cannot continue and has to exit.", "Launcher Error", 0);
+            return;
+        }
+
+        FARPROC Hook_Init = nullptr;
+        {
+            swprintf_s(dllPath, L"%s\\Northstar.dll", exePath);
+            hHookModule = LoadLibraryExW(dllPath, 0i64, 8u);
+            if (hHookModule) Hook_Init = GetProcAddress(hHookModule, "InitialiseNorthstar");
+            if (!hHookModule || Hook_Init == nullptr)
+            {
+                LibraryLoadError(GetLastError(), L"Northstar.dll", dllPath);
+                return;
+            }
+        }
+
+        ((void (*)()) Hook_Init)();
+    }
+
+    {
+        swprintf_s(dllPath, L"%s\\bin\\x64_retail\\launcher.org.dll", exePath);
+        hLauncherModule = LoadLibraryExW(dllPath, 0i64, 8u);
+        if (!hLauncherModule)
+        {
+            LibraryLoadError(GetLastError(), L"launcher.org.dll", dllPath);
+            return;
+        }
+    }
+
+    auto LauncherMain = GetLauncherMain();
+    //auto result = ((__int64(__fastcall*)())LauncherMain)();
+    //auto result = ((signed __int64(__fastcall*)(__int64))LauncherMain)(0i64);
+    auto result = ((signed __int64(__fastcall*)(__int64, __int64, __int64, uint32_t))LauncherMain)(0i64, 0i64, 0i64, 0);
+}
+
+// doubt that will help us here (in launcher.dll) though
+extern "C" {
+    __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 0x00000001;
+    __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
+}