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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>
// hook forward declares
typedef FileHandle_t(*ReadFileFromVPKType)(VPKData* vpkInfo, __int64* b, char* filename);
ReadFileFromVPKType readFileFromVPK;
FileHandle_t ReadFileFromVPKHook(VPKData* vpkInfo, __int64* b, char* filename);
typedef bool(*ReadFromCacheType)(IFileSystem* filesystem, char* path, void* result);
ReadFromCacheType readFromCache;
bool ReadFromCacheHook(IFileSystem* filesystem, char* path, void* result);
typedef void(*AddSearchPathType)(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType);
AddSearchPathType addSearchPathOriginal;
void AddSearchPathHook(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType);
bool readingOriginalFile;
std::string currentModPath;
SourceInterface<IFileSystem>* g_Filesystem;
void InitialiseFilesystem(HMODULE baseAddress)
{
g_Filesystem = new SourceInterface<IFileSystem>("filesystem_stdio.dll", "VFileSystem017");
// create hooks
HookEnabler hook;
ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x5CBA0, &ReadFileFromVPKHook, reinterpret_cast<LPVOID*>(&readFileFromVPK));
ENABLER_CREATEHOOK(hook, (*g_Filesystem)->m_vtable->ReadFromCache, &ReadFromCacheHook, reinterpret_cast<LPVOID*>(&readFromCache));
ENABLER_CREATEHOOK(hook, (*g_Filesystem)->m_vtable->AddSearchPath, &AddSearchPathHook, reinterpret_cast<LPVOID*>(&addSearchPathOriginal));
}
std::string ReadVPKFile(const char* path)
{
// read scripts.rson file, todo: check if this can be overwritten
FileHandle_t fileHandle = (*g_Filesystem)->m_vtable2->Open(&(*g_Filesystem)->m_vtable2, path, "rb", "GAME", 0);
std::stringstream fileStream;
int bytesRead = 0;
char data[4096];
do
{
bytesRead = (*g_Filesystem)->m_vtable2->Read(&(*g_Filesystem)->m_vtable2, data, std::size(data), fileHandle);
fileStream.write(data, bytesRead);
} while (bytesRead == std::size(data));
(*g_Filesystem)->m_vtable2->Close(*g_Filesystem, fileHandle);
return fileStream.str();
}
std::string ReadVPKOriginalFile(const char* path)
{
readingOriginalFile = true;
std::string ret = ReadVPKFile(path);
readingOriginalFile = false;
return ret;
}
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(currentModPath))
{
spdlog::info("changing mod search path from {} to {}", currentModPath, mod->ModDirectory.string());
addSearchPathOriginal(&*(*g_Filesystem), (fs::absolute(mod->ModDirectory) / MOD_OVERRIDE_DIR).string().c_str(), "GAME", PATH_ADD_TO_HEAD);
currentModPath = (fs::absolute(mod->ModDirectory) / MOD_OVERRIDE_DIR).string();
}
}
else // push compiled to head
addSearchPathOriginal(&*(*g_Filesystem), fs::absolute(COMPILED_ASSETS_PATH).string().c_str(), "GAME", PATH_ADD_TO_HEAD);
}
bool TryReplaceFile(char* path)
{
if (readingOriginalFile)
return false;
(*g_ModManager).CompileAssetsForFile(path);
// 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(fs::path(path).lexically_normal().string());
if (file != g_ModManager->m_modFiles.end())
{
SetNewModSearchPaths(file->second->owningMod);
return true;
}
return false;
}
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);
if (TryReplaceFile(filename))
{
*b = -1;
return b;
}
return readFileFromVPK(vpkInfo, b, filename);
}
bool ReadFromCacheHook(IFileSystem* filesystem, char* path, void* result)
{
// move this to a convar at some point when we can read them in native
//spdlog::info("ReadFromCacheHook {}", path);
if (TryReplaceFile(path))
return false;
return readFromCache(filesystem, path, result);
}
void AddSearchPathHook(IFileSystem* fileSystem, const char* pPath, const char* pathID, SearchPathAdd_t addType)
{
addSearchPathOriginal(fileSystem, pPath, pathID, addType);
// make sure current mod paths are at head
if (!strcmp(pathID, "GAME") && currentModPath.compare(pPath) && addType == PATH_ADD_TO_HEAD)
{
addSearchPathOriginal(fileSystem, currentModPath.c_str(), "GAME", PATH_ADD_TO_HEAD);
addSearchPathOriginal(fileSystem, COMPILED_ASSETS_PATH.string().c_str(), "GAME", PATH_ADD_TO_HEAD);
}
}
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