1 files changed, 299 insertions, 0 deletions
diff --git a/NorthstarDLL/rpakfilesystem.cpp b/NorthstarDLL/rpakfilesystem.cpp
new file mode 100644
index 00000000..b1363589
--- /dev/null
+++ b/NorthstarDLL/rpakfilesystem.cpp
@@ -0,0 +1,299 @@
+#include "pch.h"
+#include "rpakfilesystem.h"
+#include "modmanager.h"
+#include "dedicated.h"
+#include "tier0.h"
+
+AUTOHOOK_INIT()
+
+// there are more i'm just too lazy to add
+struct PakLoadFuncs
+{
+	void* unk0[3];
+	int (*LoadPakAsync)(const char* pPath, void* unknownSingleton, int flags, void* callback0, void* callback1);
+	void* unk1[2];
+	void* (*UnloadPak)(int iPakHandle, void* callback);
+	void* unk2[6];
+	void* (*LoadFile)(const char* path); // unsure
+	void* unk3[10];
+	void* (*ReadFileAsync)(const char* pPath, void* a2);
+};
+
+PakLoadFuncs* g_pakLoadApi;
+
+PakLoadManager* g_pPakLoadManager;
+void** pUnknownPakLoadSingleton;
+
+int PakLoadManager::LoadPakAsync(const char* pPath, const ePakLoadSource nLoadSource)
+{
+	int nHandle = g_pakLoadApi->LoadPakAsync(pPath, *pUnknownPakLoadSingleton, 2, nullptr, nullptr);
+
+	// set the load source of the pak we just loaded
+	if (nHandle != -1)
+		GetPakInfo(nHandle)->m_nLoadSource = nLoadSource;
+
+	return nHandle;
+}
+
+void PakLoadManager::UnloadPak(const int nPakHandle)
+{
+	g_pakLoadApi->UnloadPak(nPakHandle, nullptr);
+}
+
+void PakLoadManager::UnloadMapPaks()
+{
+	for (auto& pair : m_vLoadedPaks)
+		if (pair.second.m_nLoadSource == ePakLoadSource::MAP)
+			UnloadPak(pair.first);
+}
+
+LoadedPak* PakLoadManager::TrackLoadedPak(ePakLoadSource nLoadSource, int nPakHandle, size_t nPakNameHash)
+{
+	LoadedPak pak;
+	pak.m_nLoadSource = nLoadSource;
+	pak.m_nPakHandle = nPakHandle;
+	pak.m_nPakNameHash = nPakNameHash;
+
+	m_vLoadedPaks.insert(std::make_pair(nPakHandle, pak));
+	return &m_vLoadedPaks.at(nPakHandle);
+}
+
+void PakLoadManager::RemoveLoadedPak(int nPakHandle)
+{
+	m_vLoadedPaks.erase(nPakHandle);
+}
+
+LoadedPak* PakLoadManager::GetPakInfo(const int nPakHandle)
+{
+	return &m_vLoadedPaks.at(nPakHandle);
+}
+
+int PakLoadManager::GetPakHandle(const size_t nPakNameHash)
+{
+	for (auto& pair : m_vLoadedPaks)
+		if (pair.second.m_nPakNameHash == nPakNameHash)
+			return pair.first;
+
+	return -1;
+}
+
+int PakLoadManager::GetPakHandle(const char* pPath)
+{
+	return GetPakHandle(STR_HASH(pPath));
+}
+
+void* PakLoadManager::LoadFile(const char* path)
+{
+	return g_pakLoadApi->LoadFile(path);
+}
+
+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_pModManager->m_LoadedMods.size() - 1; i > -1; i--)
+	{
+		Mod* mod = &g_pModManager->m_LoadedMods[i];
+		if (!mod->m_bEnabled)
+			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_pModManager->m_LoadedMods)
+	{
+		if (!mod.m_bEnabled)
+			continue;
+
+		// need to get a relative path of mod to mod folder
+		fs::path modPakPath("./" / mod.m_ModDirectory / "paks");
+
+		for (ModRpakEntry& pak : mod.Rpaks)
+			if (pak.m_bAutoLoad)
+				g_pPakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str(), ePakLoadSource::CONSTANT);
+	}
+}
+
+void LoadPostloadPaks(const char* pPath)
+{
+	// note, loading from ./ is necessary otherwise paks will load from gamedir/r2/paks
+	for (Mod& mod : g_pModManager->m_LoadedMods)
+	{
+		if (!mod.m_bEnabled)
+			continue;
+
+		// need to get a relative path of mod to mod folder
+		fs::path modPakPath("./" / mod.m_ModDirectory / "paks");
+
+		for (ModRpakEntry& pak : mod.Rpaks)
+			if (pak.m_sLoadAfterPak == pPath)
+				g_pPakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str(), ePakLoadSource::CONSTANT);
+	}
+}
+
+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_pModManager->m_LoadedMods)
+	{
+		if (!mod.m_bEnabled)
+			continue;
+
+		// need to get a relative path of mod to mod folder
+		fs::path modPakPath("./" / mod.m_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_pPakLoadManager->LoadPakAsync((modPakPath / pak.m_sPakName).string().c_str(), ePakLoadSource::MAP);
+			}
+		}
+	}
+}
+
+// clang-format off
+HOOK(LoadPakAsyncHook, LoadPakAsync,
+int, __fastcall, (char* pPath, void* unknownSingleton, int flags, void* pCallback0, void* pCallback1))
+// clang-format on
+{
+	HandlePakAliases(&pPath);
+
+	// dont load the pak if it's currently loaded already
+	size_t nPathHash = STR_HASH(pPath);
+	if (g_pPakLoadManager->GetPakHandle(nPathHash) != -1)
+		return -1;
+
+	bool bNeedToFreePakName = false;
+
+	static bool bShouldLoadPaks = true;
+	if (bShouldLoadPaks)
+	{
+		// make a copy of the path for comparing to determine whether we should load this pak on dedi, before it could get overwritten by
+		// LoadCustomMapPaks
+		std::string originalPath(pPath);
+
+		// disable preloading while we're doing this
+		bShouldLoadPaks = false;
+
+		LoadPreloadPaks();
+		LoadCustomMapPaks(&pPath, &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 (IsDedicatedServer() && (Tier0::CommandLine()->CheckParm("-nopakdedi") ||
+									strncmp(&originalPath[0], "common", 6))) // dedicated only needs common and common_mp
+		{
+			if (bNeedToFreePakName)
+				delete[] pPath;
+
+			spdlog::info("Not loading pak {} for dedicated server", originalPath);
+			return -1;
+		}
+	}
+
+	int iPakHandle = LoadPakAsync(pPath, unknownSingleton, flags, pCallback0, pCallback1);
+	spdlog::info("LoadPakAsync {} {}", pPath, iPakHandle);
+
+	// trak the pak
+	g_pPakLoadManager->TrackLoadedPak(ePakLoadSource::UNTRACKED, iPakHandle, nPathHash);
+	LoadPostloadPaks(pPath);
+
+	if (bNeedToFreePakName)
+		delete[] pPath;
+
+	return iPakHandle;
+}
+
+// clang-format off
+HOOK(UnloadPakHook, UnloadPak,
+void*, __fastcall, (int nPakHandle, void* pCallback))
+// clang-format on
+{
+	// stop tracking the pak
+	g_pPakLoadManager->RemoveLoadedPak(nPakHandle);
+
+	static bool bShouldUnloadPaks = true;
+	if (bShouldUnloadPaks)
+	{
+		bShouldUnloadPaks = false;
+		g_pPakLoadManager->UnloadMapPaks();
+		bShouldUnloadPaks = true;
+	}
+
+	spdlog::info("UnloadPak {}", nPakHandle);
+	return UnloadPak(nPakHandle, pCallback);
+}
+
+// we hook this exclusively for resolving stbsp paths, but seemingly it's also used for other stuff like vpk, rpak, mprj and starpak loads
+// tbh this actually might be for memory mapped files or something, would make sense i think
+// clang-format off
+HOOK(ReadFileAsyncHook, ReadFileAsync, 
+void*, __fastcall, (const char* pPath, void* pCallback))
+// clang-format on
+{
+	fs::path path(pPath);
+	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_pModManager->m_ModFiles.find(g_pModManager->NormaliseModFilePath(fs::path("maps" / filename)));
+		if (modFile != g_pModManager->m_ModFiles.end())
+		{
+			// need to allocate a new string for this
+			std::string newPath = (modFile->second.m_pOwningMod->m_ModDirectory / "mod" / modFile->second.m_Path).string();
+			allocatedNewPath = new char[newPath.size() + 1];
+			strncpy_s(allocatedNewPath, newPath.size() + 1, newPath.c_str(), newPath.size());
+			pPath = allocatedNewPath;
+		}
+	}
+
+	void* ret = ReadFileAsync(pPath, pCallback);
+	if (allocatedNewPath)
+		delete[] allocatedNewPath;
+
+	return ret;
+}
+
+ON_DLL_LOAD("engine.dll", RpakFilesystem, (CModule module))
+{
+	AUTOHOOK_DISPATCH();
+
+	g_pPakLoadManager = new PakLoadManager;
+
+	g_pakLoadApi = module.Offset(0x5BED78).Deref().As<PakLoadFuncs*>();
+	pUnknownPakLoadSingleton = module.Offset(0x7C5E20).As<void**>();
+
+	LoadPakAsyncHook.Dispatch(g_pakLoadApi->LoadPakAsync);
+	UnloadPakHook.Dispatch(g_pakLoadApi->UnloadPak);
+	ReadFileAsyncHook.Dispatch(g_pakLoadApi->ReadFileAsync);
+}