various rpak loading changes (#135)

* various rpak loading changes

* format rpakfilesystem.cpp

3 files changed, 94 insertions, 11 deletions

diff --git a/NorthstarDedicatedTest/modmanager.cpp b/NorthstarDedicatedTest/modmanager.cpp
index 0ac7e4b6..f28f87c6 100644
--- a/NorthstarDedicatedTest/modmanager.cpp
+++ b/NorthstarDedicatedTest/modmanager.cpp
@@ -380,7 +380,7 @@ void ModManager::LoadMods()
 					modPak.m_bAutoLoad =
 						!bUseRpakJson || (dRpakJson.HasMember("Preload") && dRpakJson["Preload"].IsObject() &&
 										  dRpakJson["Preload"].HasMember(pakName) && dRpakJson["Preload"][pakName].IsTrue());
-					modPak.m_sPakPath = pakName;
+					modPak.m_sPakName = pakName;
 
 					// not using atm because we need to resolve path to rpak
 					// if (m_hasLoadedMods && modPak.m_bAutoLoad)
diff --git a/NorthstarDedicatedTest/modmanager.h b/NorthstarDedicatedTest/modmanager.h
index 7f12559f..798c2306 100644
--- a/NorthstarDedicatedTest/modmanager.h
+++ b/NorthstarDedicatedTest/modmanager.h
@@ -56,7 +56,7 @@ struct ModRpakEntry
 {
   public:
 	bool m_bAutoLoad;
-	std::string m_sPakPath;
+	std::string m_sPakName;
 };
 
 class Mod
diff --git a/NorthstarDedicatedTest/rpakfilesystem.cpp b/NorthstarDedicatedTest/rpakfilesystem.cpp
index 6853029b..e9d5f0c6 100644
--- a/NorthstarDedicatedTest/rpakfilesystem.cpp
+++ b/NorthstarDedicatedTest/rpakfilesystem.cpp
@@ -8,13 +8,16 @@ LoadCommonPaksForMapType LoadCommonPaksForMap;
 
 typedef void* (*LoadPakSyncType)(const char* path, void* unknownSingleton, int flags);
 typedef int (*LoadPakAsyncType)(const char* path, void* unknownSingleton, int flags, void* callback0, void* callback1);
+typedef void* (*ReadFullFileFromDiskType)(const char* requestedPath, void* a2);
 
 // there are more i'm just too lazy to add
 struct PakLoadFuncs
 {
-	void* unknown[2];
+	void* unk0[2];
 	LoadPakSyncType LoadPakSync;
 	LoadPakAsyncType LoadPakAsync;
+	void* unk1[20];
+	ReadFullFileFromDiskType ReadFullFileFromDisk;
 };
 
 PakLoadFuncs* g_pakLoadApi;
@@ -41,12 +44,8 @@ void HandlePakAliases(char** map)
 	}
 }
 
-bool bShouldPreload = true;
 void LoadPreloadPaks()
 {
-	// disable preloading while we're doing this
-	bShouldPreload = false;
-
 	// note, loading from ./ is necessary otherwise paks will load from gamedir/r2/paks
 	for (Mod& mod : g_ModManager->m_loadedMods)
 	{
@@ -58,19 +57,59 @@ void LoadPreloadPaks()
 
 		for (ModRpakEntry& pak : mod.Rpaks)
 			if (pak.m_bAutoLoad)
-				g_PakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakPath).string().c_str());
+				g_PakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str());
 	}
+}
+
+void LoadCustomMapPaks(char** pakName)
+{
+	// whether the vanilla game has this rpak
+	bool bHasOriginalPak = fs::exists(fs::path("./r2/paks") / *pakName);
+
+	// note, loading from ./ is necessary otherwise paks will load from gamedir/r2/paks
+	for (Mod& mod : g_ModManager->m_loadedMods)
+	{
+		if (!mod.Enabled)
+			continue;
 
-	bShouldPreload = true;
+		// need to get a relative path of mod to mod folder
+		fs::path modPakPath("./" / mod.ModDirectory / "paks");
+
+		for (ModRpakEntry& pak : mod.Rpaks)
+		{
+			if (!pak.m_bAutoLoad && !pak.m_sPakName.compare(*pakName))
+			{
+				// if the game doesn't have the original pak, let it handle loading this one as if it was the one it was loading originally
+				if (!bHasOriginalPak)
+				{
+					*pakName = &pak.m_sPakName[0];
+					bHasOriginalPak = true;
+				}
+				else
+					g_PakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str());
+			}
+		}
+	}
 }
 
 LoadPakSyncType LoadPakSyncOriginal;
 void* LoadPakSyncHook(char* path, void* unknownSingleton, int flags)
 {
 	HandlePakAliases(&path);
+
 	// note: we don't handle loading any preloaded custom paks synchronously since LoadPakSync is never actually called in retail, just load
 	// them async instead
-	LoadPreloadPaks();
+	static bool bShouldLoadPaks = true;
+	if (bShouldLoadPaks)
+	{
+		// disable preloading while we're doing this
+		bShouldLoadPaks = false;
+
+		LoadPreloadPaks();
+		LoadCustomMapPaks(&path);
+
+		bShouldLoadPaks = true;
+	}
 
 	spdlog::info("LoadPakSync {}", path);
 	return LoadPakSyncOriginal(path, unknownSingleton, flags);
@@ -81,14 +120,56 @@ int LoadPakAsyncHook(char* path, void* unknownSingleton, int flags, void* callba
 {
 	HandlePakAliases(&path);
 
-	if (bShouldPreload)
+	static bool bShouldLoadPaks = true;
+	if (bShouldLoadPaks)
+	{
+		// disable preloading while we're doing this
+		bShouldLoadPaks = false;
+
 		LoadPreloadPaks();
+		LoadCustomMapPaks(&path);
+
+		bShouldLoadPaks = true;
+	}
 
 	int ret = LoadPakAsyncOriginal(path, unknownSingleton, flags, callback0, callback1);
 	spdlog::info("LoadPakAsync {} {}", path, ret);
 	return ret;
 }
 
+// we hook this exclusively for resolving stbsp paths, but seemingly it's also used for other stuff like vpk and rpak loads
+// possibly just async loading all together?
+ReadFullFileFromDiskType ReadFullFileFromDiskOriginal;
+void* ReadFullFileFromDiskHook(const char* requestedPath, void* a2)
+{
+	fs::path path(requestedPath);
+	char* allocatedNewPath = nullptr;
+
+	if (path.extension() == ".stbsp")
+	{
+		fs::path filename = path.filename();
+		spdlog::info("LoadStreamBsp: {}", filename.string());
+
+		// resolve modded stbsp path so we can load mod stbsps
+		auto modFile = g_ModManager->m_modFiles.find(fs::path("maps" / filename).lexically_normal().string());
+		if (modFile != g_ModManager->m_modFiles.end())
+		{
+			// need to allocate a new string for this
+			std::string newPath = (modFile->second.owningMod->ModDirectory / "mod" / modFile->second.path).string();
+			allocatedNewPath = new char[newPath.size() + 1];
+			strncpy(allocatedNewPath, newPath.c_str(), newPath.size());
+			allocatedNewPath[newPath.size() + 1] = '\0';
+			requestedPath = allocatedNewPath;
+		}
+	}
+
+	void* ret = ReadFullFileFromDiskOriginal(requestedPath, a2);
+	if (allocatedNewPath)
+		delete[] allocatedNewPath;
+
+	return ret;
+}
+
 void InitialiseEngineRpakFilesystem(HMODULE baseAddress)
 {
 	g_PakLoadManager = new PakLoadManager;
@@ -99,4 +180,6 @@ void InitialiseEngineRpakFilesystem(HMODULE baseAddress)
 	HookEnabler hook;
 	ENABLER_CREATEHOOK(hook, g_pakLoadApi->LoadPakSync, &LoadPakSyncHook, reinterpret_cast<LPVOID*>(&LoadPakSyncOriginal));
 	ENABLER_CREATEHOOK(hook, g_pakLoadApi->LoadPakAsync, &LoadPakAsyncHook, reinterpret_cast<LPVOID*>(&LoadPakAsyncOriginal));
+	ENABLER_CREATEHOOK(
+		hook, g_pakLoadApi->ReadFullFileFromDisk, &ReadFullFileFromDiskHook, reinterpret_cast<LPVOID*>(&ReadFullFileFromDiskOriginal));
 }
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