//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================//

#ifndef FILESYSTEM_PASSTHRU_H
#define FILESYSTEM_PASSTHRU_H
#ifdef _WIN32
#pragma once
#endif

#include <stdarg.h>
#include <stdio.h>
#include "filesystem.h"

#ifdef AsyncRead
#undef AsyncRead
#undef AsyncReadMutiple
#endif

//
// These classes pass all filesystem interface calls through to another
// filesystem interface. They can be used anytime you want to override a couple
// things in a filesystem. VMPI uses this to override the base filesystem calls
// while allowing the rest of the filesystem functionality to work on the
// master.
//

template <class Base>
class CInternalFileSystemPassThru : public Base {
   public:
    CInternalFileSystemPassThru() { m_pBaseFileSystemPassThru = NULL; }
    virtual void InitPassThru(IBaseFileSystem *pBaseFileSystemPassThru) {
        m_pBaseFileSystemPassThru = pBaseFileSystemPassThru;
    }
    virtual int Read(void *pOutput, int size, FileHandle_t file) {
        return m_pBaseFileSystemPassThru->Read(pOutput, size, file);
    }
    virtual int Write(void const *pInput, int size, FileHandle_t file) {
        return m_pBaseFileSystemPassThru->Write(pInput, size, file);
    }
    virtual FileHandle_t Open(const char *pFileName, const char *pOptions,
                              const char *pathID) {
        return m_pBaseFileSystemPassThru->Open(pFileName, pOptions, pathID);
    }
    virtual void Close(FileHandle_t file) {
        m_pBaseFileSystemPassThru->Close(file);
    }
    virtual void Seek(FileHandle_t file, int pos, FileSystemSeek_t seekType) {
        m_pBaseFileSystemPassThru->Seek(file, pos, seekType);
    }
    virtual unsigned int Tell(FileHandle_t file) {
        return m_pBaseFileSystemPassThru->Tell(file);
    }
    virtual unsigned int Size(FileHandle_t file) {
        return m_pBaseFileSystemPassThru->Size(file);
    }
    virtual unsigned int Size(const char *pFileName, const char *pPathID) {
        return m_pBaseFileSystemPassThru->Size(pFileName, pPathID);
    }
    virtual void Flush(FileHandle_t file) {
        m_pBaseFileSystemPassThru->Flush(file);
    }
    virtual bool Precache(const char *pFileName, const char *pPathID) {
        return m_pBaseFileSystemPassThru->Precache(pFileName, pPathID);
    }
    virtual bool FileExists(const char *pFileName, const char *pPathID) {
        return m_pBaseFileSystemPassThru->FileExists(pFileName, pPathID);
    }
    virtual bool IsFileWritable(char const *pFileName, const char *pPathID) {
        return m_pBaseFileSystemPassThru->IsFileWritable(pFileName, pPathID);
    }
    virtual bool SetFileWritable(char const *pFileName, bool writable,
                                 const char *pPathID) {
        return m_pBaseFileSystemPassThru->SetFileWritable(pFileName, writable,
                                                          pPathID);
    }
    virtual long GetFileTime(const char *pFileName, const char *pPathID) {
        return m_pBaseFileSystemPassThru->GetFileTime(pFileName, pPathID);
    }
    virtual bool ReadFile(const char *pFileName, const char *pPath,
                          CUtlBuffer &buf, int nMaxBytes = 0,
                          int nStartingByte = 0,
                          FSAllocFunc_t pfnAlloc = NULL) {
        return m_pBaseFileSystemPassThru->ReadFile(
            pFileName, pPath, buf, nMaxBytes, nStartingByte, pfnAlloc);
    }
    virtual bool WriteFile(const char *pFileName, const char *pPath,
                           CUtlBuffer &buf) {
        return m_pBaseFileSystemPassThru->WriteFile(pFileName, pPath, buf);
    }
    virtual bool UnzipFile(const char *pFileName, const char *pPath,
                           const char *pDestination) {
        return m_pBaseFileSystemPassThru->UnzipFile(pFileName, pPath,
                                                    pDestination);
    }

   protected:
    IBaseFileSystem *m_pBaseFileSystemPassThru;
};

class CBaseFileSystemPassThru
    : public CInternalFileSystemPassThru<IBaseFileSystem> {
   public:
};

class CFileSystemPassThru : public CInternalFileSystemPassThru<IFileSystem> {
   public:
    typedef CInternalFileSystemPassThru<IFileSystem> BaseClass;

    CFileSystemPassThru() { m_pFileSystemPassThru = NULL; }
    virtual void InitPassThru(IFileSystem *pFileSystemPassThru,
                              bool bBaseOnly) {
        if (!bBaseOnly) m_pFileSystemPassThru = pFileSystemPassThru;

        BaseClass::InitPassThru(pFileSystemPassThru);
    }

    // IAppSystem stuff.
    // Here's where the app systems get to learn about each other
    virtual bool Connect(CreateInterfaceFn factory) {
        return m_pFileSystemPassThru->Connect(factory);
    }
    virtual void Disconnect() { m_pFileSystemPassThru->Disconnect(); }
    virtual void *QueryInterface(const char *pInterfaceName) {
        return m_pFileSystemPassThru->QueryInterface(pInterfaceName);
    }
    virtual InitReturnVal_t Init() { return m_pFileSystemPassThru->Init(); }
    virtual void Shutdown() { m_pFileSystemPassThru->Shutdown(); }

    virtual void RemoveAllSearchPaths(void) {
        m_pFileSystemPassThru->RemoveAllSearchPaths();
    }
    virtual void AddSearchPath(const char *pPath, const char *pathID,
                               SearchPathAdd_t addType) {
        m_pFileSystemPassThru->AddSearchPath(pPath, pathID, addType);
    }
    virtual bool RemoveSearchPath(const char *pPath, const char *pathID) {
        return m_pFileSystemPassThru->RemoveSearchPath(pPath, pathID);
    }
    virtual void RemoveFile(char const *pRelativePath, const char *pathID) {
        m_pFileSystemPassThru->RemoveFile(pRelativePath, pathID);
    }
    virtual bool RenameFile(char const *pOldPath, char const *pNewPath,
                            const char *pathID) {
        return m_pFileSystemPassThru->RenameFile(pOldPath, pNewPath, pathID);
    }
    virtual void CreateDirHierarchy(const char *path, const char *pathID) {
        m_pFileSystemPassThru->CreateDirHierarchy(path, pathID);
    }
    virtual bool IsDirectory(const char *pFileName, const char *pathID) {
        return m_pFileSystemPassThru->IsDirectory(pFileName, pathID);
    }
    virtual void FileTimeToString(char *pStrip, int maxCharsIncludingTerminator,
                                  long fileTime) {
        m_pFileSystemPassThru->FileTimeToString(
            pStrip, maxCharsIncludingTerminator, fileTime);
    }
    virtual void SetBufferSize(FileHandle_t file, unsigned nBytes) {
        m_pFileSystemPassThru->SetBufferSize(file, nBytes);
    }
    virtual bool IsOk(FileHandle_t file) {
        return m_pFileSystemPassThru->IsOk(file);
    }
    virtual bool EndOfFile(FileHandle_t file) {
        return m_pFileSystemPassThru->EndOfFile(file);
    }
    virtual char *ReadLine(char *pOutput, int maxChars, FileHandle_t file) {
        return m_pFileSystemPassThru->ReadLine(pOutput, maxChars, file);
    }
    virtual int FPrintf(FileHandle_t file,
                        PRINTF_FORMAT_STRING const char *pFormat, ...) {
        char str[8192];
        va_list marker;
        va_start(marker, pFormat);
        _vsnprintf(str, sizeof(str), pFormat, marker);
        va_end(marker);
        return m_pFileSystemPassThru->FPrintf(file, "%s", str);
    }
    virtual CSysModule *LoadModule(const char *pFileName, const char *pPathID,
                                   bool bValidatedDllOnly) {
        return m_pFileSystemPassThru->LoadModule(pFileName, pPathID,
                                                 bValidatedDllOnly);
    }
    virtual void UnloadModule(CSysModule *pModule) {
        m_pFileSystemPassThru->UnloadModule(pModule);
    }
    virtual const char *FindFirst(const char *pWildCard,
                                  FileFindHandle_t *pHandle) {
        return m_pFileSystemPassThru->FindFirst(pWildCard, pHandle);
    }
    virtual const char *FindNext(FileFindHandle_t handle) {
        return m_pFileSystemPassThru->FindNext(handle);
    }
    virtual bool FindIsDirectory(FileFindHandle_t handle) {
        return m_pFileSystemPassThru->FindIsDirectory(handle);
    }
    virtual void FindClose(FileFindHandle_t handle) {
        m_pFileSystemPassThru->FindClose(handle);
    }
    virtual const char *GetLocalPath(const char *pFileName,
                                     OUT_Z_CAP(maxLenInChars) char *pDest,
                                     int maxLenInChars) {
        return m_pFileSystemPassThru->GetLocalPath(pFileName, pDest,
                                                   maxLenInChars);
    }
    virtual bool FullPathToRelativePath(const char *pFullpath,
                                        OUT_Z_CAP(maxLenInChars) char *pDest,
                                        int maxLenInChars) {
        return m_pFileSystemPassThru->FullPathToRelativePath(pFullpath, pDest,
                                                             maxLenInChars);
    }
    virtual bool GetCaseCorrectFullPath_Ptr(
        const char *pFullPath, OUT_Z_CAP(maxLenInChars) char *pDest,
        int maxLenInChars) {
        return m_pFileSystemPassThru->GetCaseCorrectFullPath_Ptr(
            pFullPath, pDest, maxLenInChars);
    }
    virtual bool GetCurrentDirectory(char *pDirectory, int maxlen) {
        return m_pFileSystemPassThru->GetCurrentDirectory(pDirectory, maxlen);
    }
    virtual void PrintOpenedFiles(void) {
        m_pFileSystemPassThru->PrintOpenedFiles();
    }
    virtual void PrintSearchPaths(void) {
        m_pFileSystemPassThru->PrintSearchPaths();
    }
    virtual void SetWarningFunc(
        void (*pfnWarning)(PRINTF_FORMAT_STRING const char *fmt, ...)) {
        m_pFileSystemPassThru->SetWarningFunc(pfnWarning);
    }
    virtual void SetWarningLevel(FileWarningLevel_t level) {
        m_pFileSystemPassThru->SetWarningLevel(level);
    }
    virtual void AddLoggingFunc(void (*pfnLogFunc)(const char *fileName,
                                                   const char *accessType)) {
        m_pFileSystemPassThru->AddLoggingFunc(pfnLogFunc);
    }
    virtual void RemoveLoggingFunc(FileSystemLoggingFunc_t logFunc) {
        m_pFileSystemPassThru->RemoveLoggingFunc(logFunc);
    }
    virtual FSAsyncStatus_t AsyncReadMultiple(
        const FileAsyncRequest_t *pRequests, int nRequests,
        FSAsyncControl_t *pControls) {
        return m_pFileSystemPassThru->AsyncReadMultiple(pRequests, nRequests,
                                                        pControls);
    }
    virtual FSAsyncStatus_t AsyncReadMultipleCreditAlloc(
        const FileAsyncRequest_t *pRequests, int nRequests, const char *pszFile,
        int line, FSAsyncControl_t *pControls) {
        return m_pFileSystemPassThru->AsyncReadMultipleCreditAlloc(
            pRequests, nRequests, pszFile, line, pControls);
    }
    virtual FSAsyncStatus_t AsyncFinish(FSAsyncControl_t hControl, bool wait) {
        return m_pFileSystemPassThru->AsyncFinish(hControl, wait);
    }
    virtual FSAsyncStatus_t AsyncGetResult(FSAsyncControl_t hControl,
                                           void **ppData, int *pSize) {
        return m_pFileSystemPassThru->AsyncGetResult(hControl, ppData, pSize);
    }
    virtual FSAsyncStatus_t AsyncAbort(FSAsyncControl_t hControl) {
        return m_pFileSystemPassThru->AsyncAbort(hControl);
    }
    virtual FSAsyncStatus_t AsyncStatus(FSAsyncControl_t hControl) {
        return m_pFileSystemPassThru->AsyncStatus(hControl);
    }
    virtual FSAsyncStatus_t AsyncFlush() {
        return m_pFileSystemPassThru->AsyncFlush();
    }
    virtual void AsyncAddRef(FSAsyncControl_t hControl) {
        m_pFileSystemPassThru->AsyncAddRef(hControl);
    }
    virtual void AsyncRelease(FSAsyncControl_t hControl) {
        m_pFileSystemPassThru->AsyncRelease(hControl);
    }
    virtual FSAsyncStatus_t AsyncBeginRead(const char *pszFile,
                                           FSAsyncFile_t *phFile) {
        return m_pFileSystemPassThru->AsyncBeginRead(pszFile, phFile);
    }
    virtual FSAsyncStatus_t AsyncEndRead(FSAsyncFile_t hFile) {
        return m_pFileSystemPassThru->AsyncEndRead(hFile);
    }
    virtual void AsyncAddFetcher(IAsyncFileFetch *pFetcher) {
        m_pFileSystemPassThru->AsyncAddFetcher(pFetcher);
    }
    virtual void AsyncRemoveFetcher(IAsyncFileFetch *pFetcher) {
        m_pFileSystemPassThru->AsyncRemoveFetcher(pFetcher);
    }
    virtual const FileSystemStatistics *GetFilesystemStatistics() {
        return m_pFileSystemPassThru->GetFilesystemStatistics();
    }
    virtual WaitForResourcesHandle_t WaitForResources(
        const char *resourcelist) {
        return m_pFileSystemPassThru->WaitForResources(resourcelist);
    }
    virtual bool GetWaitForResourcesProgress(WaitForResourcesHandle_t handle,
                                             float *progress, bool *complete) {
        return m_pFileSystemPassThru->GetWaitForResourcesProgress(
            handle, progress, complete);
    }
    virtual void CancelWaitForResources(WaitForResourcesHandle_t handle) {
        m_pFileSystemPassThru->CancelWaitForResources(handle);
    }
    virtual int HintResourceNeed(const char *hintlist, int forgetEverything) {
        return m_pFileSystemPassThru->HintResourceNeed(hintlist,
                                                       forgetEverything);
    }
    virtual bool IsFileImmediatelyAvailable(const char *pFileName) {
        return m_pFileSystemPassThru->IsFileImmediatelyAvailable(pFileName);
    }
    virtual void GetLocalCopy(const char *pFileName) {
        m_pFileSystemPassThru->GetLocalCopy(pFileName);
    }
    virtual FileNameHandle_t FindOrAddFileName(char const *pFileName) {
        return m_pFileSystemPassThru->FindOrAddFileName(pFileName);
    }
    virtual FileNameHandle_t FindFileName(char const *pFileName) {
        return m_pFileSystemPassThru->FindFileName(pFileName);
    }
    virtual bool String(const FileNameHandle_t &handle, char *buf, int buflen) {
        return m_pFileSystemPassThru->String(handle, buf, buflen);
    }
    virtual bool IsOk2(FileHandle_t file) { return IsOk(file); }
    virtual void RemoveSearchPaths(const char *szPathID) {
        m_pFileSystemPassThru->RemoveSearchPaths(szPathID);
    }
    virtual bool IsSteam() const { return m_pFileSystemPassThru->IsSteam(); }
    virtual FilesystemMountRetval_t MountSteamContent(int nExtraAppId = -1) {
        return m_pFileSystemPassThru->MountSteamContent(nExtraAppId);
    }

    virtual const char *FindFirstEx(const char *pWildCard, const char *pPathID,
                                    FileFindHandle_t *pHandle) {
        return m_pFileSystemPassThru->FindFirstEx(pWildCard, pPathID, pHandle);
    }
    virtual void MarkPathIDByRequestOnly(const char *pPathID,
                                         bool bRequestOnly) {
        m_pFileSystemPassThru->MarkPathIDByRequestOnly(pPathID, bRequestOnly);
    }
    virtual bool AddPackFile(const char *fullpath, const char *pathID) {
        return m_pFileSystemPassThru->AddPackFile(fullpath, pathID);
    }
    virtual FSAsyncStatus_t AsyncAppend(const char *pFileName, const void *pSrc,
                                        int nSrcBytes, bool bFreeMemory,
                                        FSAsyncControl_t *pControl) {
        return m_pFileSystemPassThru->AsyncAppend(pFileName, pSrc, nSrcBytes,
                                                  bFreeMemory, pControl);
    }
    virtual FSAsyncStatus_t AsyncWrite(const char *pFileName, const void *pSrc,
                                       int nSrcBytes, bool bFreeMemory,
                                       bool bAppend,
                                       FSAsyncControl_t *pControl) {
        return m_pFileSystemPassThru->AsyncWrite(
            pFileName, pSrc, nSrcBytes, bFreeMemory, bAppend, pControl);
    }
    virtual FSAsyncStatus_t AsyncWriteFile(const char *pFileName,
                                           const CUtlBuffer *pSrc,
                                           int nSrcBytes, bool bFreeMemory,
                                           bool bAppend,
                                           FSAsyncControl_t *pControl) {
        return m_pFileSystemPassThru->AsyncWriteFile(
            pFileName, pSrc, nSrcBytes, bFreeMemory, bAppend, pControl);
    }
    virtual FSAsyncStatus_t AsyncAppendFile(const char *pDestFileName,
                                            const char *pSrcFileName,
                                            FSAsyncControl_t *pControl) {
        return m_pFileSystemPassThru->AsyncAppendFile(pDestFileName,
                                                      pSrcFileName, pControl);
    }
    virtual void AsyncFinishAll(int iToPriority) {
        m_pFileSystemPassThru->AsyncFinishAll(iToPriority);
    }
    virtual void AsyncFinishAllWrites() {
        m_pFileSystemPassThru->AsyncFinishAllWrites();
    }
    virtual FSAsyncStatus_t AsyncSetPriority(FSAsyncControl_t hControl,
                                             int newPriority) {
        return m_pFileSystemPassThru->AsyncSetPriority(hControl, newPriority);
    }
    virtual bool AsyncSuspend() {
        return m_pFileSystemPassThru->AsyncSuspend();
    }
    virtual bool AsyncResume() { return m_pFileSystemPassThru->AsyncResume(); }
    virtual const char *RelativePathToFullPath(
        const char *pFileName, const char *pPathID,
        OUT_Z_CAP(maxLenInChars) char *pDest, int maxLenInChars,
        PathTypeFilter_t pathFilter = FILTER_NONE,
        PathTypeQuery_t *pPathType = NULL) {
        return m_pFileSystemPassThru->RelativePathToFullPath(
            pFileName, pPathID, pDest, maxLenInChars, pathFilter, pPathType);
    }
    virtual int GetSearchPath(const char *pathID, bool bGetPackFiles,
                              OUT_Z_CAP(maxLenInChars) char *pDest,
                              int maxLenInChars) {
        return m_pFileSystemPassThru->GetSearchPath(pathID, bGetPackFiles,
                                                    pDest, maxLenInChars);
    }

    virtual FileHandle_t OpenEx(const char *pFileName, const char *pOptions,
                                unsigned flags = 0, const char *pathID = 0,
                                char **ppszResolvedFilename = NULL) {
        return m_pFileSystemPassThru->OpenEx(pFileName, pOptions, flags, pathID,
                                             ppszResolvedFilename);
    }
    virtual int ReadEx(void *pOutput, int destSize, int size,
                       FileHandle_t file) {
        return m_pFileSystemPassThru->ReadEx(pOutput, destSize, size, file);
    }
    virtual int ReadFileEx(const char *pFileName, const char *pPath,
                           void **ppBuf, bool bNullTerminate,
                           bool bOptimalAlloc, int nMaxBytes = 0,
                           int nStartingByte = 0,
                           FSAllocFunc_t pfnAlloc = NULL) {
        return m_pFileSystemPassThru->ReadFileEx(
            pFileName, pPath, ppBuf, bNullTerminate, bOptimalAlloc, nMaxBytes,
            nStartingByte, pfnAlloc);
    }

#if defined(TRACK_BLOCKING_IO)
    virtual void EnableBlockingFileAccessTracking(bool state) {
        m_pFileSystemPassThru->EnableBlockingFileAccessTracking(state);
    }
    virtual bool IsBlockingFileAccessEnabled() const {
        return m_pFileSystemPassThru->IsBlockingFileAccessEnabled();
    }

    virtual IBlockingFileItemList *RetrieveBlockingFileAccessInfo() {
        return m_pFileSystemPassThru->RetrieveBlockingFileAccessInfo();
    }
#endif
    virtual void SetupPreloadData() {}
    virtual void DiscardPreloadData() {}

    virtual void LoadCompiledKeyValues(KeyValuesPreloadType_t type,
                                       char const *archiveFile) {
        m_pFileSystemPassThru->LoadCompiledKeyValues(type, archiveFile);
    }

    // If the "PreloadedData" hasn't been purged, then this'll try and instance
    // the KeyValues using the fast path of compiled keyvalues loaded during
    // startup. Otherwise, it'll just fall through to the regular KeyValues
    // loading routines
    virtual KeyValues *LoadKeyValues(KeyValuesPreloadType_t type,
                                     char const *filename,
                                     char const *pPathID = 0) {
        return m_pFileSystemPassThru->LoadKeyValues(type, filename, pPathID);
    }
    virtual bool LoadKeyValues(KeyValues &head, KeyValuesPreloadType_t type,
                               char const *filename, char const *pPathID = 0) {
        return m_pFileSystemPassThru->LoadKeyValues(head, type, filename,
                                                    pPathID);
    }
    virtual bool ExtractRootKeyName(KeyValuesPreloadType_t type, char *outbuf,
                                    size_t bufsize, char const *filename,
                                    char const *pPathID = 0) {
        return m_pFileSystemPassThru->ExtractRootKeyName(type, outbuf, bufsize,
                                                         filename, pPathID);
    }

    virtual bool GetFileTypeForFullPath(char const *pFullPath, wchar_t *buf,
                                        size_t bufSizeInBytes) {
        return m_pFileSystemPassThru->GetFileTypeForFullPath(pFullPath, buf,
                                                             bufSizeInBytes);
    }

    virtual bool GetOptimalIOConstraints(FileHandle_t hFile,
                                         unsigned *pOffsetAlign,
                                         unsigned *pSizeAlign,
                                         unsigned *pBufferAlign) {
        return m_pFileSystemPassThru->GetOptimalIOConstraints(
            hFile, pOffsetAlign, pSizeAlign, pBufferAlign);
    }
    virtual void *AllocOptimalReadBuffer(FileHandle_t hFile, unsigned nSize,
                                         unsigned nOffset) {
        return m_pFileSystemPassThru->AllocOptimalReadBuffer(hFile, nOffset,
                                                             nSize);
    }
    virtual void FreeOptimalReadBuffer(void *p) {
        m_pFileSystemPassThru->FreeOptimalReadBuffer(p);
    }

    virtual void BeginMapAccess() { m_pFileSystemPassThru->BeginMapAccess(); }
    virtual void EndMapAccess() { m_pFileSystemPassThru->EndMapAccess(); }

    virtual bool ReadToBuffer(FileHandle_t hFile, CUtlBuffer &buf,
                              int nMaxBytes = 0,
                              FSAllocFunc_t pfnAlloc = NULL) {
        return m_pFileSystemPassThru->ReadToBuffer(hFile, buf, nMaxBytes,
                                                   pfnAlloc);
    }
    virtual bool FullPathToRelativePathEx(const char *pFullPath,
                                          const char *pPathId,
                                          OUT_Z_CAP(maxLenInChars) char *pDest,
                                          int maxLenInChars) {
        return m_pFileSystemPassThru->FullPathToRelativePathEx(
            pFullPath, pPathId, pDest, maxLenInChars);
    }
    virtual int GetPathIndex(const FileNameHandle_t &handle) {
        return m_pFileSystemPassThru->GetPathIndex(handle);
    }
    virtual long GetPathTime(const char *pPath, const char *pPathID) {
        return m_pFileSystemPassThru->GetPathTime(pPath, pPathID);
    }

    virtual DVDMode_t GetDVDMode() {
        return m_pFileSystemPassThru->GetDVDMode();
    }

    virtual void EnableWhitelistFileTracking(bool bEnable,
                                             bool bCacheAllVPKHashes,
                                             bool bRecalculateAndCheckHashes) {
        m_pFileSystemPassThru->EnableWhitelistFileTracking(
            bEnable, bCacheAllVPKHashes, bRecalculateAndCheckHashes);
    }
    virtual void RegisterFileWhitelist(IPureServerWhitelist *pWhiteList,
                                       IFileList **ppFilesToReload) OVERRIDE {
        m_pFileSystemPassThru->RegisterFileWhitelist(pWhiteList,
                                                     ppFilesToReload);
    }
    virtual void MarkAllCRCsUnverified() {
        m_pFileSystemPassThru->MarkAllCRCsUnverified();
    }
    virtual void CacheFileCRCs(const char *pPathname, ECacheCRCType eType,
                               IFileList *pFilter) {
        return m_pFileSystemPassThru->CacheFileCRCs(pPathname, eType, pFilter);
    }
    virtual EFileCRCStatus CheckCachedFileHash(const char *pPathID,
                                               const char *pRelativeFilename,
                                               int nFileFraction,
                                               FileHash_t *pFileHash) {
        return m_pFileSystemPassThru->CheckCachedFileHash(
            pPathID, pRelativeFilename, nFileFraction, pFileHash);
    }
    virtual int GetUnverifiedFileHashes(CUnverifiedFileHash *pFiles,
                                        int nMaxFiles) {
        return m_pFileSystemPassThru->GetUnverifiedFileHashes(pFiles,
                                                              nMaxFiles);
    }
    virtual int GetWhitelistSpewFlags() {
        return m_pFileSystemPassThru->GetWhitelistSpewFlags();
    }
    virtual void SetWhitelistSpewFlags(int spewFlags) {
        m_pFileSystemPassThru->SetWhitelistSpewFlags(spewFlags);
    }
    virtual void InstallDirtyDiskReportFunc(FSDirtyDiskReportFunc_t func) {
        m_pFileSystemPassThru->InstallDirtyDiskReportFunc(func);
    }

    virtual FileCacheHandle_t CreateFileCache() {
        return m_pFileSystemPassThru->CreateFileCache();
    }
    virtual void AddFilesToFileCache(FileCacheHandle_t cacheId,
                                     const char **ppFileNames, int nFileNames,
                                     const char *pPathID) {
        m_pFileSystemPassThru->AddFilesToFileCache(cacheId, ppFileNames,
                                                   nFileNames, pPathID);
    }
    virtual bool IsFileCacheFileLoaded(FileCacheHandle_t cacheId,
                                       const char *pFileName) {
        return m_pFileSystemPassThru->IsFileCacheFileLoaded(cacheId, pFileName);
    }
    virtual bool IsFileCacheLoaded(FileCacheHandle_t cacheId) {
        return m_pFileSystemPassThru->IsFileCacheLoaded(cacheId);
    }
    virtual void DestroyFileCache(FileCacheHandle_t cacheId) {
        m_pFileSystemPassThru->DestroyFileCache(cacheId);
    }

    virtual bool RegisterMemoryFile(
        CMemoryFileBacking *pFile, CMemoryFileBacking **ppExistingFileWithRef) {
        return m_pFileSystemPassThru->RegisterMemoryFile(pFile,
                                                         ppExistingFileWithRef);
    }
    virtual void UnregisterMemoryFile(CMemoryFileBacking *pFile) {
        m_pFileSystemPassThru->UnregisterMemoryFile(pFile);
    }
    virtual void CacheAllVPKFileHashes(bool bCacheAllVPKHashes,
                                       bool bRecalculateAndCheckHashes) {
        return m_pFileSystemPassThru->CacheAllVPKFileHashes(
            bCacheAllVPKHashes, bRecalculateAndCheckHashes);
    }
    virtual bool CheckVPKFileHash(int PackFileID, int nPackFileNumber,
                                  int nFileFraction, MD5Value_t &md5Value) {
        return m_pFileSystemPassThru->CheckVPKFileHash(
            PackFileID, nPackFileNumber, nFileFraction, md5Value);
    }
    virtual void NotifyFileUnloaded(const char *pszFilename,
                                    const char *pPathId) OVERRIDE {
        m_pFileSystemPassThru->NotifyFileUnloaded(pszFilename, pPathId);
    }

   protected:
    IFileSystem *m_pFileSystemPassThru;
};

// This is so people who change the filesystem interface are forced to add the
// passthru wrapper into CFileSystemPassThru, so they don't break VMPI.
inline void GiveMeACompileError() { CFileSystemPassThru asdf; }

#endif  // FILESYSTEM_PASSTHRU_H