1 files changed, 313 insertions, 0 deletions
diff --git a/NorthstarDLL/rpakfilesystem.cpp b/NorthstarDLL/rpakfilesystem.cpp
new file mode 100644
index 00000000..cb069b56
--- /dev/null
+++ b/NorthstarDLL/rpakfilesystem.cpp
@@ -0,0 +1,313 @@
+#include "pch.h"
+#include "rpakfilesystem.h"
+#include "hookutils.h"
+#include "modmanager.h"
+#include "dedicated.h"
+
+typedef void* (*LoadCommonPaksForMapType)(char* map);
+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* (*UnloadPakType)(int pakHandle, void* callback);
+typedef void* (*ReadFullFileFromDiskType)(const char* requestedPath, void* a2);
+
+// there are more i'm just too lazy to add
+struct PakLoadFuncs
+{
+	void* unk0[2];
+	LoadPakSyncType LoadPakSync;
+	LoadPakAsyncType LoadPakAsync;
+	void* unk1[2];
+	UnloadPakType UnloadPak;
+	void* unk2[17];
+	ReadFullFileFromDiskType ReadFullFileFromDisk;
+};
+
+PakLoadFuncs* g_pakLoadApi;
+void** pUnknownPakLoadSingleton;
+
+PakLoadManager* g_PakLoadManager;
+void PakLoadManager::LoadPakSync(const char* path)
+{
+	g_pakLoadApi->LoadPakSync(path, *pUnknownPakLoadSingleton, 0);
+}
+void PakLoadManager::LoadPakAsync(const char* path, bool bMarkForUnload)
+{
+	int handle = g_pakLoadApi->LoadPakAsync(path, *pUnknownPakLoadSingleton, 2, nullptr, nullptr);
+
+	if (bMarkForUnload)
+		m_pakHandlesToUnload.push_back(handle);
+}
+
+void PakLoadManager::UnloadPaks()
+{
+	for (int pakHandle : m_pakHandlesToUnload)
+	{
+		g_pakLoadApi->UnloadPak(pakHandle, nullptr);
+		// remove pak from loadedPaks and loadedPaksInv
+		RemoveLoadedPak(pakHandle);
+	}
+
+	m_pakHandlesToUnload.clear();
+}
+
+bool PakLoadManager::IsPakLoaded(int32_t pakHandle)
+{
+	return loadedPaks.find(pakHandle) != loadedPaks.end();
+}
+
+bool PakLoadManager::IsPakLoaded(size_t hash)
+{
+	return loadedPaksInv.find(hash) != loadedPaksInv.end();
+}
+
+void PakLoadManager::AddLoadedPak(int32_t pakHandle, size_t hash)
+{
+	loadedPaks[pakHandle] = hash;
+	loadedPaksInv[hash] = pakHandle;
+}
+
+void PakLoadManager::RemoveLoadedPak(int32_t pakHandle)
+{
+	loadedPaksInv.erase(loadedPaks[pakHandle]);
+	loadedPaks.erase(pakHandle);
+}
+
+void HandlePakAliases(char** map)
+{
+	// convert the pak being loaded to it's aliased one, e.g. aliasing mp_hub_timeshift => sp_hub_timeshift
+	for (int64_t i = g_ModManager->m_loadedMods.size() - 1; i > -1; i--)
+	{
+		Mod* mod = &g_ModManager->m_loadedMods[i];
+		if (!mod->Enabled)
+			continue;
+
+		if (mod->RpakAliases.find(*map) != mod->RpakAliases.end())
+		{
+			*map = &mod->RpakAliases[*map][0];
+			return;
+		}
+	}
+}
+
+void LoadPreloadPaks()
+{
+	// note, loading from ./ is necessary otherwise paks will load from gamedir/r2/paks
+	for (Mod& mod : g_ModManager->m_loadedMods)
+	{
+		if (!mod.Enabled)
+			continue;
+
+		// 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)
+				g_PakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str(), false);
+	}
+}
+
+void LoadPostloadPaks(char** map)
+{
+	// note, loading from ./ is necessary otherwise paks will load from gamedir/r2/paks
+	for (Mod& mod : g_ModManager->m_loadedMods)
+	{
+		if (!mod.Enabled)
+			continue;
+
+		// 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_sLoadAfterPak == *map)
+				g_PakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str(), false);
+	}
+}
+
+void LoadCustomMapPaks(char** pakName, bool* bNeedToFreePakName)
+{
+	// whether the vanilla game has this rpak
+	bool bHasOriginalPak = fs::exists(fs::path("./r2/paks/Win64/") / *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;
+
+		// 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)
+				{
+					std::string path = (modPakPath / pak.m_sPakName).string();
+					*pakName = new char[path.size() + 1];
+					strcpy(*pakName, &path[0]);
+					(*pakName)[path.size()] = '\0';
+
+					bHasOriginalPak = true;
+					*bNeedToFreePakName =
+						true; // we can't free this memory until we're done with the pak, so let whatever's calling this deal with it
+				}
+				else
+					g_PakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str(), true);
+			}
+		}
+	}
+}
+
+LoadPakSyncType LoadPakSyncOriginal;
+void* LoadPakSyncHook(char* path, void* unknownSingleton, int flags)
+{
+	HandlePakAliases(&path);
+
+	bool bNeedToFreePakName = false;
+
+	// note: we don't handle loading any preloaded custom paks synchronously since LoadPakSync is never actually called in retail, just load
+	// them async instead
+	static bool bShouldLoadPaks = true;
+	if (bShouldLoadPaks)
+	{
+		// disable preloading while we're doing this
+		bShouldLoadPaks = false;
+
+		LoadPreloadPaks();
+		LoadCustomMapPaks(&path, &bNeedToFreePakName);
+
+		bShouldLoadPaks = true;
+	}
+
+	spdlog::info("LoadPakSync {}", path);
+	void* ret = LoadPakSyncOriginal(path, unknownSingleton, flags);
+
+	if (bNeedToFreePakName)
+		delete[] path;
+
+	return ret;
+}
+
+LoadPakAsyncType LoadPakAsyncOriginal;
+int LoadPakAsyncHook(char* path, void* unknownSingleton, int flags, void* callback0, void* callback1)
+{
+	size_t hash = STR_HASH(path);
+	// if the hash is already in the map, dont load the pak, it has already been loaded
+	if (g_PakLoadManager->IsPakLoaded(hash))
+	{
+		return -1;
+	}
+
+	HandlePakAliases(&path);
+
+	bool bNeedToFreePakName = false;
+
+	static bool bShouldLoadPaks = true;
+	if (bShouldLoadPaks)
+	{
+		// disable preloading while we're doing this
+		bShouldLoadPaks = false;
+
+		LoadPreloadPaks();
+		LoadCustomMapPaks(&path, &bNeedToFreePakName);
+
+		bShouldLoadPaks = true;
+
+		// do this after custom paks load and in bShouldLoadPaks so we only ever call this on the root pakload call
+		// todo: could probably add some way to flag custom paks to not be loaded on dedicated servers in rpak.json
+		if (IsDedicated() && strncmp(path, "common", 6)) // dedicated only needs common and common_mp
+			return -1;
+	}
+
+	int ret = LoadPakAsyncOriginal(path, unknownSingleton, flags, callback0, callback1);
+	spdlog::info("LoadPakAsync {} {}", path, ret);
+
+	// add the hash to the map
+	g_PakLoadManager->AddLoadedPak(ret, hash);
+
+	LoadPostloadPaks(&path);
+
+	if (bNeedToFreePakName)
+		delete[] path;
+
+	return ret;
+}
+
+UnloadPakType UnloadPakOriginal;
+void* UnloadPakHook(int pakHandle, void* callback)
+{
+	if (g_PakLoadManager->IsPakLoaded(pakHandle))
+	{
+		// remove the entry
+		g_PakLoadManager->RemoveLoadedPak(pakHandle);
+	}
+
+	static bool bShouldUnloadPaks = true;
+	if (bShouldUnloadPaks)
+	{
+		bShouldUnloadPaks = false;
+		g_PakLoadManager->UnloadPaks();
+		bShouldUnloadPaks = true;
+	}
+
+	spdlog::info("UnloadPak {}", pakHandle);
+	return UnloadPakOriginal(pakHandle, callback);
+}
+
+// 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()] = '\0';
+			requestedPath = allocatedNewPath;
+		}
+	}
+
+	void* ret = ReadFullFileFromDiskOriginal(requestedPath, a2);
+	if (allocatedNewPath)
+		delete[] allocatedNewPath;
+
+	return ret;
+}
+
+void InitialiseEngineRpakFilesystem(HMODULE baseAddress)
+{
+	g_PakLoadManager = new PakLoadManager;
+
+	g_pakLoadApi = *(PakLoadFuncs**)((char*)baseAddress + 0x5BED78);
+	pUnknownPakLoadSingleton = (void**)((char*)baseAddress + 0x7C5E20);
+
+	HookEnabler hook;
+	ENABLER_CREATEHOOK(
+		hook, reinterpret_cast<void*>(g_pakLoadApi->LoadPakSync), &LoadPakSyncHook, reinterpret_cast<LPVOID*>(&LoadPakSyncOriginal));
+	ENABLER_CREATEHOOK(
+		hook, reinterpret_cast<void*>(g_pakLoadApi->LoadPakAsync), &LoadPakAsyncHook, reinterpret_cast<LPVOID*>(&LoadPakAsyncOriginal));
+	ENABLER_CREATEHOOK(
+		hook, reinterpret_cast<void*>(g_pakLoadApi->UnloadPak), &UnloadPakHook, reinterpret_cast<LPVOID*>(&UnloadPakOriginal));
+	ENABLER_CREATEHOOK(
+		hook,
+		reinterpret_cast<void*>(g_pakLoadApi->ReadFullFileFromDisk),
+		&ReadFullFileFromDiskHook,
+		reinterpret_cast<LPVOID*>(&ReadFullFileFromDiskOriginal));
+}