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#include "filesystem.h"
#include "core/tier1.h"
#include "mods/modmanager.h"
#include <iostream>
#include <sstream>
bool bReadingOriginalFile = false;
std::string sCurrentModPath;
ConVar* Cvar_ns_fs_log_reads;
IFileSystem* g_pFilesystem;
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)
{
// todo: should probably set search path to be g_pModName here also
bReadingOriginalFile = true;
std::string ret = ReadVPKFile(path);
bReadingOriginalFile = false;
return ret;
}
static void(__fastcall* o_pAddSearchPath)(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType) =
nullptr;
static void __fastcall h_AddSearchPath(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType)
{
o_pAddSearchPath(fileSystem, pPath, pathID, addType);
// make sure current mod paths are at head
if (!strcmp(pathID, "GAME") && sCurrentModPath.compare(pPath) && addType == PATH_ADD_TO_HEAD)
{
o_pAddSearchPath(fileSystem, sCurrentModPath.c_str(), "GAME", PATH_ADD_TO_HEAD);
o_pAddSearchPath(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->m_ModDirectory) / MOD_OVERRIDE_DIR).string().compare(sCurrentModPath))
{
o_pAddSearchPath(
g_pFilesystem, (fs::absolute(mod->m_ModDirectory) / MOD_OVERRIDE_DIR).string().c_str(), "GAME", PATH_ADD_TO_HEAD);
sCurrentModPath = (fs::absolute(mod->m_ModDirectory) / MOD_OVERRIDE_DIR).string();
}
}
else // push compiled to head
o_pAddSearchPath(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_pModManager->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_pModManager->m_ModFiles.find(g_pModManager->NormaliseModFilePath(fs::path(pPath)));
if (file != g_pModManager->m_ModFiles.end())
{
SetNewModSearchPaths(file->second.m_pOwningMod);
return true;
}
return false;
}
// force modded files to be read from mods, not cache
static bool(__fastcall* o_pReadFromCache)(IFileSystem* filesystem, char* pPath, void* result) = nullptr;
static bool __fastcall h_ReadFromCache(IFileSystem* filesystem, char* pPath, void* result)
{
if (TryReplaceFile(pPath, true))
return false;
return o_pReadFromCache(filesystem, pPath, result);
}
static FileHandle_t(__fastcall* o_pReadFileFromVPK)(VPKData* vpkInfo, uint64_t* b, char* filename) = nullptr;
static FileHandle_t __fastcall h_ReadFileFromVPK(VPKData* vpkInfo, uint64_t* b, char* filename)
{
// don't compile here because this is only ever called from OpenEx, which already compiles
if (TryReplaceFile(filename, false))
{
*b = -1;
return b;
}
return o_pReadFileFromVPK(vpkInfo, b, filename);
}
static FileHandle_t(__fastcall* o_pCBaseFileSystem__OpenEx)(
IFileSystem* filesystem, const char* pPath, const char* pOptions, uint32_t flags, const char* pPathID, char** ppszResolvedFilename) =
nullptr;
static FileHandle_t __fastcall h_CBaseFileSystem__OpenEx(
IFileSystem* filesystem, const char* pPath, const char* pOptions, uint32_t flags, const char* pPathID, char** ppszResolvedFilename)
{
TryReplaceFile(pPath, true);
return o_pCBaseFileSystem__OpenEx(filesystem, pPath, pOptions, flags, pPathID, ppszResolvedFilename);
}
static VPKData* (*o_pMountVPK)(IFileSystem* fileSystem, const char* pVpkPath) = nullptr;
static VPKData* h_MountVPK(IFileSystem* fileSystem, const char* pVpkPath)
{
NS::log::fs->info("MountVPK {}", pVpkPath);
VPKData* ret = o_pMountVPK(fileSystem, pVpkPath);
for (Mod mod : g_pModManager->m_LoadedMods)
{
if (!mod.m_bEnabled)
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(pVpkPath).filename().string());
std::string modMapName(fs::path(vpkEntry.m_sVpkPath.c_str()).filename().string());
if (mapName.compare(modMapName))
continue;
}
VPKData* loaded = o_pMountVPK(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, (CModule module))
{
o_pReadFileFromVPK = module.Offset(0x5CBA0).RCast<decltype(o_pReadFileFromVPK)>();
HookAttach(&(PVOID&)o_pReadFileFromVPK, (PVOID)h_ReadFileFromVPK);
o_pCBaseFileSystem__OpenEx = module.Offset(0x15F50).RCast<decltype(o_pCBaseFileSystem__OpenEx)>();
HookAttach(&(PVOID&)o_pCBaseFileSystem__OpenEx, (PVOID)h_CBaseFileSystem__OpenEx);
g_pFilesystem = Sys_GetFactoryPtr("filesystem_stdio.dll", "VFileSystem017").RCast<IFileSystem*>();
o_pAddSearchPath = reinterpret_cast<decltype(o_pAddSearchPath)>(g_pFilesystem->m_vtable->AddSearchPath);
HookAttach(&(PVOID&)o_pAddSearchPath, (PVOID)h_AddSearchPath);
o_pReadFromCache = reinterpret_cast<decltype(o_pReadFromCache)>(g_pFilesystem->m_vtable->ReadFromCache);
HookAttach(&(PVOID&)o_pReadFromCache, (PVOID)h_ReadFromCache);
o_pMountVPK = reinterpret_cast<decltype(o_pMountVPK)>(g_pFilesystem->m_vtable->MountVPK);
HookAttach(&(PVOID&)o_pMountVPK, (PVOID)h_MountVPK);
}
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