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#include "pch.h"
#include "filesystem.h"
#include "hooks.h"
#include "hookutils.h"
#include "sourceinterface.h"
#include "modmanager.h"
#include <iostream>
#include <sstream>
using namespace R2FS;
bool bReadingOriginalFile = false;
std::string sCurrentModPath;
ConVar* Cvar_ns_fs_log_reads;
namespace R2FS
{
std::string ReadVPKFile(const char* path)
{
// read scripts.rson file, todo: check if this can be overwritten
FileHandle_t fileHandle = (*g_pFilesystem)->m_vtable2->Open(&(*g_pFilesystem)->m_vtable2, path, "rb", "GAME", 0);
std::stringstream fileStream;
int bytesRead = 0;
char data[4096];
do
{
bytesRead = (*g_pFilesystem)->m_vtable2->Read(&(*g_pFilesystem)->m_vtable2, data, (int)std::size(data), fileHandle);
fileStream.write(data, bytesRead);
} while (bytesRead == std::size(data));
(*g_pFilesystem)->m_vtable2->Close(*g_pFilesystem, fileHandle);
return fileStream.str();
}
std::string ReadVPKOriginalFile(const char* path)
{
bReadingOriginalFile = true;
std::string ret = ReadVPKFile(path);
bReadingOriginalFile = false;
return ret;
}
SourceInterface<IFileSystem>* g_pFilesystem;
}
typedef void (*AddSearchPathType)(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType);
AddSearchPathType AddSearchPath;
void AddSearchPathHook(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType)
{
AddSearchPath(fileSystem, pPath, pathID, addType);
// make sure current mod paths are at head
if (!strcmp(pathID, "GAME") && sCurrentModPath.compare(pPath) && addType == PATH_ADD_TO_HEAD)
{
AddSearchPath(fileSystem, sCurrentModPath.c_str(), "GAME", PATH_ADD_TO_HEAD);
AddSearchPath(fileSystem, GetCompiledAssetsPath().string().c_str(), "GAME", PATH_ADD_TO_HEAD);
}
}
void SetNewModSearchPaths(Mod* mod)
{
// put our new path to the head if we need to read from a different mod path
// in the future we could also determine whether the file we're setting paths for needs a mod dir, or compiled assets
if (mod != nullptr)
{
if ((fs::absolute(mod->ModDirectory) / MOD_OVERRIDE_DIR).string().compare(sCurrentModPath))
{
spdlog::info("changing mod search path from {} to {}", sCurrentModPath, mod->ModDirectory.string());
AddSearchPath(
&*(*g_pFilesystem), (fs::absolute(mod->ModDirectory) / MOD_OVERRIDE_DIR).string().c_str(), "GAME", PATH_ADD_TO_HEAD);
sCurrentModPath = (fs::absolute(mod->ModDirectory) / MOD_OVERRIDE_DIR).string();
}
}
else // push compiled to head
AddSearchPath(&*(*g_pFilesystem), fs::absolute(GetCompiledAssetsPath()).string().c_str(), "GAME", PATH_ADD_TO_HEAD);
}
bool TryReplaceFile(const char* pPath, bool shouldCompile)
{
if (bReadingOriginalFile)
return false;
if (shouldCompile)
g_ModManager->CompileAssetsForFile(pPath);
// idk how efficient the lexically normal check is
// can't just set all /s in path to \, since some paths aren't in writeable memory
auto file = g_ModManager->m_modFiles.find(g_ModManager->NormaliseModFilePath(fs::path(pPath)));
if (file != g_ModManager->m_modFiles.end())
{
SetNewModSearchPaths(file->second.owningMod);
return true;
}
return false;
}
typedef bool (*ReadFromCacheType)(IFileSystem* filesystem, char* path, void* result);
ReadFromCacheType ReadFromCache;
bool ReadFromCacheHook(IFileSystem* filesystem, char* pPath, void* result)
{
if (TryReplaceFile(pPath, false))
return false;
return ReadFromCache(filesystem, pPath, result);
}
typedef FileHandle_t (*ReadFileFromVPKType)(VPKData* vpkInfo, __int64* b, char* filename);
ReadFileFromVPKType ReadFileFromVPK;
FileHandle_t ReadFileFromVPKHook(VPKData* vpkInfo, __int64* b, char* filename)
{
// move this to a convar at some point when we can read them in native
//spdlog::info("ReadFileFromVPKHook {} {}", filename, vpkInfo->path);
// there is literally never any reason to compile here, since we'll always compile in ReadFileFromFilesystemHook in the same codepath
// this is called
if (TryReplaceFile(filename, false))
{
*b = -1;
return b;
}
return ReadFileFromVPK(vpkInfo, b, filename);
}
typedef FileHandle_t (*CBaseFileSystem__OpenExType)(
IFileSystem* filesystem, const char* pPath, const char* pOptions, uint32_t flags, const char* pPathID, char** ppszResolvedFilename);
CBaseFileSystem__OpenExType CBaseFileSystem__OpenEx;
FileHandle_t CBaseFileSystem__OpenExHook(IFileSystem* filesystem, const char* pPath, const char* pOptions, uint32_t flags, const char* pPathID, char **ppszResolvedFilename)
{
//if (Cvar_ns_fs_log_reads->GetBool())
// this isn't super efficient, but it's necessary, since calling addsearchpath in readfilefromvpk doesn't work, possibly refactor later
// it also might be possible to hook functions that are called later, idk look into callstack for ReadFileFromVPK
if (!bReadingOriginalFile)
TryReplaceFile(pPath, true);
return CBaseFileSystem__OpenEx(filesystem, pPath, pOptions, flags, pPathID, ppszResolvedFilename);
}
typedef VPKData* (*MountVPKType)(IFileSystem* fileSystem, const char* vpkPath);
MountVPKType MountVPK;
VPKData* MountVPKHook(IFileSystem* fileSystem, const char* vpkPath)
{
spdlog::info("MountVPK {}", vpkPath);
VPKData* ret = MountVPK(fileSystem, vpkPath);
for (Mod mod : g_ModManager->m_loadedMods)
{
if (!mod.Enabled)
continue;
for (ModVPKEntry& vpkEntry : mod.Vpks)
{
// if we're autoloading, just load no matter what
if (!vpkEntry.m_bAutoLoad)
{
// resolve vpk name and try to load one with the same name
// todo: we should be unloading these on map unload manually
std::string mapName(fs::path(vpkPath).filename().string());
std::string modMapName(fs::path(vpkEntry.m_sVpkPath.c_str()).filename().string());
if (mapName.compare(modMapName))
continue;
}
VPKData* loaded = MountVPK(fileSystem, vpkEntry.m_sVpkPath.c_str());
if (!ret) // this is primarily for map vpks and stuff, so the map's vpk is what gets returned from here
ret = loaded;
}
}
return ret;
}
ON_DLL_LOAD("filesystem_stdio.dll", Filesystem, [](HMODULE baseAddress)
{
R2FS::g_pFilesystem = new SourceInterface<IFileSystem>("filesystem_stdio.dll", "VFileSystem017");
// create hooks
HookEnabler hook;
ENABLER_CREATEHOOK(hook, (*g_pFilesystem)->m_vtable->ReadFromCache, &ReadFromCacheHook, reinterpret_cast<LPVOID*>(&ReadFromCache));
ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x5CBA0, &ReadFileFromVPKHook, reinterpret_cast<LPVOID*>(&ReadFileFromVPK));
ENABLER_CREATEHOOK(
hook, (char*)baseAddress + 0x15F50, &CBaseFileSystem__OpenExHook, reinterpret_cast<LPVOID*>(&CBaseFileSystem__OpenEx));
ENABLER_CREATEHOOK(hook, (*g_pFilesystem)->m_vtable->AddSearchPath, &AddSearchPathHook, reinterpret_cast<LPVOID*>(&AddSearchPath));
ENABLER_CREATEHOOK(hook, (*g_pFilesystem)->m_vtable->MountVPK, &MountVPKHook, reinterpret_cast<LPVOID*>(&MountVPK));
})
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