Team Fortress 2 Source Code as on 22/4/2020
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================//
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#endif
#include "basefilesystem.h"
#include "packfile.h"
#include "tier0/dbg.h"
#include "tier0/threadtools.h"
#ifdef _WIN32
#include "tier0/tslist.h"
#elif defined(POSIX)
#include <fcntl.h>
#ifdef LINUX
#include <sys/file.h>
#endif
#endif
#include "tier1/convar.h"
#include "tier0/vcrmode.h"
#include "tier0/vprof.h"
#include "tier1/fmtstr.h"
#include "tier1/utlrbtree.h"
#include "vstdlib/osversion.h"
#ifdef _X360
#undef WaitForSingleObject
#endif
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
ASSERT_INVARIANT( SEEK_CUR == FILESYSTEM_SEEK_CURRENT );
ASSERT_INVARIANT( SEEK_SET == FILESYSTEM_SEEK_HEAD );
ASSERT_INVARIANT( SEEK_END == FILESYSTEM_SEEK_TAIL );
//-----------------------------------------------------------------------------
class CFileSystem_Stdio : public CBaseFileSystem
{
public:
CFileSystem_Stdio();
~CFileSystem_Stdio();
// Used to get at older versions
void *QueryInterface( const char *pInterfaceName );
// Higher level filesystem methods requiring specific behavior
virtual void GetLocalCopy( const char *pFileName );
virtual int HintResourceNeed( const char *hintlist, int forgetEverything );
virtual bool IsFileImmediatelyAvailable(const char *pFileName);
virtual WaitForResourcesHandle_t WaitForResources( const char *resourcelist );
virtual bool GetWaitForResourcesProgress( WaitForResourcesHandle_t handle, float *progress /* out */ , bool *complete /* out */ );
virtual void CancelWaitForResources( WaitForResourcesHandle_t handle );
virtual bool IsSteam() const { return false; }
virtual FilesystemMountRetval_t MountSteamContent( int nExtraAppId = -1 ) { return FILESYSTEM_MOUNT_OK; }
bool GetOptimalIOConstraints( FileHandle_t hFile, unsigned *pOffsetAlign, unsigned *pSizeAlign, unsigned *pBufferAlign );
void *AllocOptimalReadBuffer( FileHandle_t hFile, unsigned nSize, unsigned nOffset );
void FreeOptimalReadBuffer( void *p );
protected:
// implementation of CBaseFileSystem virtual functions
virtual FILE *FS_fopen( const char *filename, const char *options, unsigned flags, int64 *size );
virtual void FS_setbufsize( FILE *fp, unsigned nBytes );
virtual void FS_fclose( FILE *fp );
virtual void FS_fseek( FILE *fp, int64 pos, int seekType );
virtual long FS_ftell( FILE *fp );
virtual int FS_feof( FILE *fp );
virtual size_t FS_fread( void *dest, size_t destSize, size_t size, FILE *fp );
virtual size_t FS_fwrite( const void *src, size_t size, FILE *fp );
virtual bool FS_setmode( FILE *fp, FileMode_t mode );
virtual size_t FS_vfprintf( FILE *fp, const char *fmt, va_list list );
virtual int FS_ferror( FILE *fp );
virtual int FS_fflush( FILE *fp );
virtual char *FS_fgets( char *dest, int destSize, FILE *fp );
virtual int FS_stat( const char *path, struct _stat *buf, bool *pbLoadedFromSteamCache=NULL );
virtual int FS_chmod( const char *path, int pmode );
virtual HANDLE FS_FindFirstFile(const char *findname, WIN32_FIND_DATA *dat);
virtual bool FS_FindNextFile(HANDLE handle, WIN32_FIND_DATA *dat);
virtual bool FS_FindClose(HANDLE handle);
virtual int FS_GetSectorSize( FILE * );
private:
bool CanAsync() const
{
return m_bCanAsync;
}
bool m_bMounted;
bool m_bCanAsync;
};
//-----------------------------------------------------------------------------
// Per-file worker classes
//-----------------------------------------------------------------------------
abstract_class CStdFilesystemFile
{
public:
virtual ~CStdFilesystemFile() {}
virtual void FS_setbufsize( unsigned nBytes ) = 0;
virtual void FS_fclose() = 0;
virtual void FS_fseek( int64 pos, int seekType ) = 0;
virtual long FS_ftell() = 0;
virtual int FS_feof() = 0;
virtual size_t FS_fread( void *dest, size_t destSize, size_t size ) = 0;
virtual size_t FS_fwrite( const void *src, size_t size ) = 0;
virtual bool FS_setmode( FileMode_t mode ) = 0;
virtual size_t FS_vfprintf( const char *fmt, va_list list ) = 0;
virtual int FS_ferror() = 0;
virtual int FS_fflush() = 0;
virtual char *FS_fgets( char *dest, int destSize ) = 0;
virtual int FS_GetSectorSize() { return 1; }
};
//---------------------------------------------------------
class CStdioFile : public CStdFilesystemFile
{
public:
static CStdioFile *FS_fopen( const char *filename, const char *options, int64 *size );
virtual void FS_setbufsize( unsigned nBytes );
virtual void FS_fclose();
virtual void FS_fseek( int64 pos, int seekType );
virtual long FS_ftell();
virtual int FS_feof();
virtual size_t FS_fread( void *dest, size_t destSize, size_t size);
virtual size_t FS_fwrite( const void *src, size_t size );
virtual bool FS_setmode( FileMode_t mode );
virtual size_t FS_vfprintf( const char *fmt, va_list list );
virtual int FS_ferror();
virtual int FS_fflush();
virtual char *FS_fgets( char *dest, int destSize );
#ifdef POSIX
static CUtlMap< ino_t, CThreadMutex * > m_LockedFDMap;
static CThreadMutex m_MutexLockedFD;
#endif
private:
CStdioFile( FILE *pFile, bool bWriteable )
: m_pFile( pFile ), m_bWriteable( bWriteable )
{
}
FILE *m_pFile;
bool m_bWriteable;
};
#ifdef POSIX
CUtlMap< ino_t, CThreadMutex * > CStdioFile::m_LockedFDMap;
CThreadMutex CStdioFile::m_MutexLockedFD;
#endif
//-----------------------------------------------------------------------------
#ifdef _WIN32
class CWin32ReadOnlyFile : public CStdFilesystemFile
{
public:
static bool CanOpen( const char *filename, const char *options );
static CWin32ReadOnlyFile *FS_fopen( const char *filename, const char *options, int64 *size );
virtual void FS_setbufsize( unsigned nBytes ) {}
virtual void FS_fclose();
virtual void FS_fseek( int64 pos, int seekType );
virtual long FS_ftell();
virtual int FS_feof();
virtual size_t FS_fread( void *dest, size_t destSize, size_t size);
virtual size_t FS_fwrite( const void *src, size_t size ) { return 0; }
virtual bool FS_setmode( FileMode_t mode ) { Error( "Can't set mode, open a second file in right mode\n" ); return false; }
virtual size_t FS_vfprintf( const char *fmt, va_list list ) { return 0; }
virtual int FS_ferror() { return 0; }
virtual int FS_fflush() { return 0; }
virtual char *FS_fgets( char *dest, int destSize );
virtual int FS_GetSectorSize() { return m_SectorSize; }
private:
CWin32ReadOnlyFile( HANDLE hFileUnbuffered, HANDLE hFileBuffered, int sectorSize, int64 fileSize, bool bOverlapped )
: m_hFileUnbuffered( hFileUnbuffered ),
m_hFileBuffered( hFileBuffered ),
m_ReadPos( 0 ),
m_Size( fileSize ),
m_SectorSize( sectorSize ),
m_bOverlapped( bOverlapped )
{
}
int64 m_ReadPos;
int64 m_Size;
HANDLE m_hFileUnbuffered;
HANDLE m_hFileBuffered;
CThreadFastMutex m_Mutex;
int m_SectorSize;
bool m_bOverlapped;
};
#endif
//-----------------------------------------------------------------------------
// singleton
//-----------------------------------------------------------------------------
CFileSystem_Stdio g_FileSystem_Stdio;
#if defined(_WIN32) && defined(DEDICATED)
CBaseFileSystem *BaseFileSystem_Stdio( void )
{
return &g_FileSystem_Stdio;
}
#endif
#ifdef DEDICATED // "hack" to allow us to not export a stdio version of the FILESYSTEM_INTERFACE_VERSION anywhere
IFileSystem *g_pFileSystem = &g_FileSystem_Stdio;
IBaseFileSystem *g_pBaseFileSystem = &g_FileSystem_Stdio;
#else
EXPOSE_SINGLE_INTERFACE_GLOBALVAR( CFileSystem_Stdio, IFileSystem, FILESYSTEM_INTERFACE_VERSION, g_FileSystem_Stdio );
EXPOSE_SINGLE_INTERFACE_GLOBALVAR( CFileSystem_Stdio, IBaseFileSystem, BASEFILESYSTEM_INTERFACE_VERSION, g_FileSystem_Stdio );
#endif
//-----------------------------------------------------------------------------
#ifndef _RETAIL
bool UseOptimalBufferAllocation()
{
static bool bUseOptimalBufferAllocation = ( IsX360() || ( !IsLinux() && Q_stristr( Plat_GetCommandLine(), "-unbuffered_io" ) != NULL ) );
return bUseOptimalBufferAllocation;
}
ConVar filesystem_unbuffered_io( "filesystem_unbuffered_io", "1", 0, "" );
#define UseUnbufferedIO() ( UseOptimalBufferAllocation() && filesystem_unbuffered_io.GetBool() )
#else
#define UseUnbufferedIO() true
#endif
ConVar filesystem_native( "filesystem_native", "1", 0, "Use native FS or STDIO" );
ConVar filesystem_max_stdio_read( "filesystem_max_stdio_read", IsX360() ? "64" : "16", 0, "" );
ConVar filesystem_report_buffered_io( "filesystem_report_buffered_io", "0" );
//-----------------------------------------------------------------------------
// constructor
//-----------------------------------------------------------------------------
CFileSystem_Stdio::CFileSystem_Stdio()
{
m_bMounted = false;
m_bCanAsync = true;
#ifdef POSIX
SetDefLessFunc( CStdioFile::m_LockedFDMap );
#endif
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
CFileSystem_Stdio::~CFileSystem_Stdio()
{
#ifdef POSIX
FOR_EACH_MAP_FAST( CStdioFile::m_LockedFDMap, i )
{
Assert( CStdioFile::m_LockedFDMap[ i ] );
delete CStdioFile::m_LockedFDMap[ i ];
}
CStdioFile::m_LockedFDMap.RemoveAll();
#endif
Assert(!m_bMounted);
}
//-----------------------------------------------------------------------------
// QueryInterface:
//-----------------------------------------------------------------------------
void *CFileSystem_Stdio::QueryInterface( const char *pInterfaceName )
{
// We also implement the IMatSystemSurface interface
if (!Q_strncmp( pInterfaceName, FILESYSTEM_INTERFACE_VERSION, Q_strlen(FILESYSTEM_INTERFACE_VERSION) + 1))
return (IFileSystem*)this;
return CBaseFileSystem::QueryInterface( pInterfaceName );
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
bool CFileSystem_Stdio::GetOptimalIOConstraints( FileHandle_t hFile, unsigned *pOffsetAlign, unsigned *pSizeAlign, unsigned *pBufferAlign )
{
unsigned sectorSize;
if ( hFile && UseOptimalBufferAllocation() )
{
CFileHandle *fh = ( CFileHandle *)hFile;
sectorSize = fh->GetSectorSize();
if ( !sectorSize || ( fh->m_pPackFileHandle && ( fh->m_pPackFileHandle->AbsoluteBaseOffset() % sectorSize ) ) )
{
sectorSize = 1;
}
}
else
{
sectorSize = 1;
}
if ( pOffsetAlign )
{
*pOffsetAlign = sectorSize;
}
if ( pSizeAlign )
{
*pSizeAlign = sectorSize;
}
if ( pBufferAlign )
{
if ( IsX360() )
{
*pBufferAlign = 4;
}
else
{
*pBufferAlign = sectorSize;
}
}
return ( sectorSize > 1 );
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void *CFileSystem_Stdio::AllocOptimalReadBuffer( FileHandle_t hFile, unsigned nSize, unsigned nOffset )
{
if ( !UseOptimalBufferAllocation() )
{
return CBaseFileSystem::AllocOptimalReadBuffer( hFile, nSize, nOffset );
}
unsigned sectorSize;
if ( hFile != FILESYSTEM_INVALID_HANDLE )
{
CFileHandle *fh = ( CFileHandle *)hFile;
sectorSize = fh->GetSectorSize();
if ( !nSize )
{
nSize = fh->Size();
}
if ( fh->m_pPackFileHandle )
{
nOffset += fh->m_pPackFileHandle->AbsoluteBaseOffset();
}
}
else
{
// an invalid handle gets a fake "optimal" but valid buffer
// this path is for a caller that isn't doing i/o,
// but needs an "optimal" buffer that can end up passed to FreeOptimalReadBuffer()
sectorSize = 4;
}
bool bOffsetIsAligned = ( nOffset % sectorSize == 0 );
unsigned nAllocSize = ( bOffsetIsAligned ) ? AlignValue( nSize, sectorSize ) : nSize;
if ( IsX360() )
{
return malloc( nAllocSize );
}
else
{
unsigned nAllocAlignment = ( bOffsetIsAligned ) ? sectorSize : 4;
return _aligned_malloc( nAllocSize, nAllocAlignment );
}
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void CFileSystem_Stdio::FreeOptimalReadBuffer( void *p )
{
if ( !UseOptimalBufferAllocation() )
{
CBaseFileSystem::FreeOptimalReadBuffer( p );
return;
}
if ( p )
{
if ( IsX360() )
{
free( p );
}
else
{
_aligned_free( p );
}
}
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
FILE *CFileSystem_Stdio::FS_fopen( const char *filenameT, const char *options, unsigned flags, int64 *size )
{
CStdFilesystemFile *pFile = NULL;
char filename[ MAX_PATH ];
CBaseFileSystem::FixUpPath ( filenameT, filename, sizeof( filename ) );
#ifdef _WIN32
if ( CWin32ReadOnlyFile::CanOpen( filename, options ) )
{
pFile = CWin32ReadOnlyFile::FS_fopen( filename, options, size );
if ( pFile )
{
return (FILE *)pFile;
}
}
#endif
pFile = CStdioFile::FS_fopen( filename, options, size );
return (FILE *)pFile;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CFileSystem_Stdio::FS_setbufsize( FILE *fp, unsigned nBytes )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
pFile->FS_setbufsize( nBytes );
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CFileSystem_Stdio::FS_fclose( FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
pFile->FS_fclose();
delete pFile;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CFileSystem_Stdio::FS_fseek( FILE *fp, int64 pos, int seekType )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
pFile->FS_fseek( pos, seekType );
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
long CFileSystem_Stdio::FS_ftell( FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_ftell();
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::FS_feof( FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_feof();
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
size_t CFileSystem_Stdio::FS_fread( void *dest, size_t destSize, size_t size, FILE *fp )
{
tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s", __FUNCTION__ );
if( ThreadInMainThread() )
{
tmPlotI32( TELEMETRY_LEVEL0, TMPT_MEMORY, 0, size, "FileBytesRead" );
}
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
size_t nBytesRead = pFile->FS_fread( dest, destSize, size);
Trace_FRead( nBytesRead, fp );
return nBytesRead;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
size_t CFileSystem_Stdio::FS_fwrite( const void *src, size_t size, FILE *fp )
{
tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s %t", __FUNCTION__, tmSendCallStack( TELEMETRY_LEVEL0, 0 ) );
if( ThreadInMainThread() )
{
tmPlotI32( TELEMETRY_LEVEL0, TMPT_MEMORY, 0, size, "FileBytesWrite" );
}
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
size_t nBytesWritten = pFile->FS_fwrite(src, size);
return nBytesWritten;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
bool CFileSystem_Stdio::FS_setmode( FILE *fp, FileMode_t mode )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_setmode( mode );
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
size_t CFileSystem_Stdio::FS_vfprintf( FILE *fp, const char *fmt, va_list list )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_vfprintf(fmt, list);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::FS_ferror( FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_ferror();
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::FS_fflush( FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_fflush();
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
char *CFileSystem_Stdio::FS_fgets( char *dest, int destSize, FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_fgets(dest, destSize);
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : *path -
// pmode -
// Output : int
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::FS_chmod( const char *pathT, int pmode )
{
if ( !pathT )
return -1;
char path[ MAX_PATH ];
CBaseFileSystem::FixUpPath ( pathT, path, sizeof( path ) );
int rt = _chmod( path, pmode );
#if defined(LINUX)
if (rt==-1)
{
char caseFixedName[ MAX_PATH ];
const bool found = findFileInDirCaseInsensitive_safe( path, caseFixedName );
if ( found )
{
rt=_chmod( caseFixedName, pmode );
}
}
#endif
return rt;
}
//-----------------------------------------------------------------------------
// Purpose: A replacement for _stat() backed by GetFileAttributesEx for XP users
//
// Workaround for:
// https://connect.microsoft.com/VisualStudio/feedback/details/1600505/stat-not-working-on-windows-xp-using-v14-xp-platform-toolset-vs2015
//
// This is not well tested or meant to be a proper implementation of stat(), but rather a band-aid for XP users only
// until microsoft pushes a runtime update to fix above issue :-/
//-----------------------------------------------------------------------------
#if defined(_WIN32) && defined(FILESYSTEM_MSVC2015_STAT_BUG_WORKAROUND)
static int WindowsXPStatShim( const char *pathT, struct _stat *buf )
{
WIN32_FILE_ATTRIBUTE_DATA fileAttributes;
if ( !GetFileAttributesEx(pathT, GetFileExInfoStandard, &fileAttributes) )
{
*_errno() = ENOENT;
return -1;
}
memset( buf, 0, sizeof(struct _stat) );
// Mode
unsigned short permBits = _S_IREAD; // If GetFileAttributes let us see it, we can read it. I think.
if ( fileAttributes.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
{
buf->st_mode |= _S_IFDIR;
permBits |= _S_IEXEC;
}
else
{
buf->st_mode |= _S_IFREG;
const char *pExt = V_GetFileExtension( pathT );
if ( V_strcasecmp( pExt, "exe" ) == 0 ||
V_strcasecmp( pExt, "bat" ) == 0 ||
V_strcasecmp( pExt, "com" ) == 0 ||
V_strcasecmp( pExt, "cmd" ) == 0 )
{
// Windows stat seems to set this flag for these extensions
permBits |= _S_IEXEC;
}
}
if ( fileAttributes.dwFileAttributes & FILE_ATTRIBUTE_READONLY )
{
permBits |= S_IWRITE;
}
// Duplicate permission bits to user/group/world (windows stat doesn't care)
buf->st_mode |= permBits | permBits >> 3 | permBits >> 6;
// Device is just drive-letter-index according to msdn
char driveLetter = tolower( pathT[ 0 ] );
if ( driveLetter >= 'a' && driveLetter <= 'z' && pathT[1] == ':' )
{
unsigned char driveIdx = driveLetter - 'a';
buf->st_dev = driveIdx;
buf->st_rdev = driveIdx;
}
else
{
buf->st_dev = _getdrive();
buf->st_rdev = _getdrive();
}
buf->st_nlink = 1;
buf->st_size = (uint64_t)fileAttributes.nFileSizeHigh << 32 | fileAttributes.nFileSizeLow;
// The 90s was a hell of a time I guess.
uint64_t actualAccessTime = (uint64_t)fileAttributes.ftLastAccessTime.dwHighDateTime << 32 | (uint64_t)fileAttributes.ftLastAccessTime.dwLowDateTime;
uint64_t actualModTime = (uint64_t)fileAttributes.ftLastWriteTime.dwHighDateTime << 32 | (uint64_t)fileAttributes.ftLastWriteTime.dwLowDateTime;
uint64_t actualCreationTime = (uint64_t)fileAttributes.ftCreationTime.dwHighDateTime << 32 | (uint64_t)fileAttributes.ftCreationTime.dwLowDateTime;
uint64_t ullMSUniverseToEveryoneElseUniverse = (369 * 365 + 89) * 86400ull; // okay
buf->st_atime = actualAccessTime / 10000000ull - ullMSUniverseToEveryoneElseUniverse;
buf->st_mtime = actualModTime / 10000000ull - ullMSUniverseToEveryoneElseUniverse;
buf->st_ctime = actualCreationTime / 10000000ull - ullMSUniverseToEveryoneElseUniverse;
// st_uid/st_gid always 0 on windows
return 0;
}
#endif // defined(_WIN32) && defined(FILESYSTEM_MSVC2015_STAT_BUG_WORKAROUND)
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::FS_stat( const char *pathT, struct _stat *buf, bool *pbLoadedFromSteamCache )
{
if ( pbLoadedFromSteamCache )
*pbLoadedFromSteamCache = false;
if ( !pathT )
{
return -1;
}
char path[ MAX_PATH ];
CBaseFileSystem::FixUpPath ( pathT, path, sizeof( path ) );
int rt = _stat( path, buf );
// Workaround bug wherein stat() randomly fails on Windows XP. See comment on function.
#if defined(_WIN32) && defined(FILESYSTEM_MSVC2015_STAT_BUG_WORKAROUND)
if ( rt == -1 )
{
EOSType eOSType = GetOSType();
if ( eOSType == k_eWin2000 || eOSType == k_eWinXP || eOSType == k_eWin2003 )
{
rt = WindowsXPStatShim( path, buf );
}
}
#endif // defined(_WIN32) && defined(FILESYSTEM_MSVC2015_STAT_BUG_WORKAROUND)
#if defined(LINUX)
if ( rt == -1 )
{
char caseFixedName[ MAX_PATH ];
bool found = findFileInDirCaseInsensitive_safe( path, caseFixedName );
if ( found )
{
rt = _stat( caseFixedName, buf );
}
}
#endif
return rt;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
HANDLE CFileSystem_Stdio::FS_FindFirstFile(const char *findnameT, WIN32_FIND_DATA *dat)
{
char findname[ MAX_PATH ];
CBaseFileSystem::FixUpPath ( findnameT, findname, sizeof( findname ) );
return ::FindFirstFile(findname, dat);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
bool CFileSystem_Stdio::FS_FindNextFile(HANDLE handle, WIN32_FIND_DATA *dat)
{
if (INVALID_HANDLE_VALUE == handle) // invalid handle should return false
return false;
return (::FindNextFile(handle, dat) != 0);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
bool CFileSystem_Stdio::FS_FindClose(HANDLE handle)
{
return (::FindClose(handle) != 0);
}
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::FS_GetSectorSize( FILE *fp )
{
CStdFilesystemFile *pFile = ((CStdFilesystemFile *)fp);
return pFile->FS_GetSectorSize();
}
//-----------------------------------------------------------------------------
// Purpose: files are always immediately available on disk
//-----------------------------------------------------------------------------
bool CFileSystem_Stdio::IsFileImmediatelyAvailable(const char *pFileName)
{
return true;
}
// enable this if you want the stdio filesystem to pretend it's steam, and make people wait for resources
//#define DEBUG_WAIT_FOR_RESOURCES_API
#if defined(DEBUG_WAIT_FOR_RESOURCES_API)
static float g_flDebugProgress = 0.0f;
#endif
//-----------------------------------------------------------------------------
// Purpose: steam call, unnecessary in stdio
//-----------------------------------------------------------------------------
WaitForResourcesHandle_t CFileSystem_Stdio::WaitForResources( const char *resourcelist )
{
#if defined(DEBUG_WAIT_FOR_RESOURCES_API)
g_flDebugProgress = 0.0f;
#endif
return 1;
}
//-----------------------------------------------------------------------------
// Purpose: steam call, unnecessary in stdio
//-----------------------------------------------------------------------------
bool CFileSystem_Stdio::GetWaitForResourcesProgress( WaitForResourcesHandle_t handle, float *progress /* out */ , bool *complete /* out */ )
{
#if defined(DEBUG_WAIT_FOR_RESOURCES_API)
g_flDebugProgress += 0.002f;
if (g_flDebugProgress < 1.0f)
{
*progress = g_flDebugProgress;
*complete = false;
return true;
}
#endif
// always return that we're complete
*progress = 0.0f;
*complete = true;
return true;
}
//-----------------------------------------------------------------------------
// Purpose: steam call, unnecessary in stdio
//-----------------------------------------------------------------------------
void CFileSystem_Stdio::CancelWaitForResources( WaitForResourcesHandle_t handle )
{
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CFileSystem_Stdio::GetLocalCopy( const char *pFileName )
{
// do nothing. . everything is local.
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
int CFileSystem_Stdio::HintResourceNeed( const char *hintlist, int forgetEverything )
{
// do nothing. . everything is local.
return 0;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
CStdioFile *CStdioFile::FS_fopen( const char *filenameT, const char *options, int64 *size )
{
FILE *pFile = NULL;
char *p = NULL;
char filename[MAX_PATH];
struct _stat buf;
V_strncpy( filename, filenameT, sizeof(filename) );
// stop newline characters at end of filename
p = strchr( filename, '\n' );
if ( p )
*p = '\0';
p = strchr( filename, '\r' );
if ( p )
*p = '\0';
pFile = fopen(filename, options);
if (pFile && size)
{
// todo: replace with filelength()?
int rt = _stat( filename, &buf );
if (rt == 0)
{
*size = buf.st_size;
}
}
#if defined(LINUX)
if(!pFile && !strchr(options,'w') && !strchr(options,'+') ) // try opening the lower cased version
{
char caseFixedName[ MAX_PATH ];
bool found = findFileInDirCaseInsensitive_safe( filename, caseFixedName );
if ( found )
{
pFile = fopen( caseFixedName, options );
if (pFile && size)
{
// todo: replace with filelength()?
struct _stat buf;
int rt = _stat( caseFixedName, &buf );
if (rt == 0)
{
*size = buf.st_size;
}
}
}
}
#endif
if ( pFile )
{
bool bWriteable = false;
if ( strchr(options,'w') || strchr(options,'a') )
bWriteable = true;
#if defined POSIX
if ( bWriteable )
{
CThreadMutex *pMutex = NULL;
{
AUTO_LOCK( m_MutexLockedFD );
// Win32 has an undocumented feature that is serialized ALL writes to a file across threads (i.e only 1 thread can open a file at a time)
// so add a lock here to mimic that behavior
int iLockID = m_LockedFDMap.Find( buf.st_ino );
if ( iLockID != m_LockedFDMap.InvalidIndex() )
{
pMutex = m_LockedFDMap[iLockID];
}
else
{
CThreadMutex *newMutex = new CThreadMutex;
pMutex = m_LockedFDMap[m_LockedFDMap.Insert( buf.st_ino, newMutex )];
}
}
// grab the lock once we have UNLOCKED m_MutexLockedFD so we don't deadlock on a close
pMutex->Lock();
rewind( pFile );
// we need to get the file size again after the lock returns
if (pFile && size)
{
int rt = _stat( filename, &buf );
if (rt == 0)
{
*size = buf.st_size;
}
}
}
#endif
return new CStdioFile( pFile, bWriteable );
}
return NULL;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CStdioFile::FS_setbufsize( unsigned nBytes )
{
#ifdef _WIN32
if ( nBytes )
{
setvbuf( m_pFile, NULL, _IOFBF, 32768 );
}
else
{
setvbuf( m_pFile, NULL, _IONBF, 0 );
#if defined(_MSC_VER) && ( _MSC_VER < 1900 )
// hack to make microsoft stdio not always read one stray byte on odd sized files
m_pFile->_bufsiz = 1;
#endif
}
#endif
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CStdioFile::FS_fclose()
{
#ifdef POSIX
if ( m_bWriteable )
{
AUTO_LOCK( m_MutexLockedFD );
struct _stat buf;
int fd = fileno_unlocked( m_pFile );
fstat( fd, &buf );
fflush( m_pFile );
int iLockID = m_LockedFDMap.Find( buf.st_ino );
if ( iLockID != m_LockedFDMap.InvalidIndex() )
{
m_LockedFDMap[iLockID]->Unlock();
}
}
#endif
fclose(m_pFile);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CStdioFile::FS_fseek( int64 pos, int seekType )
{
fseek( m_pFile, pos, seekType );
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
long CStdioFile::FS_ftell()
{
return ftell(m_pFile);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CStdioFile::FS_feof()
{
return feof(m_pFile);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
size_t CStdioFile::FS_fread( void *dest, size_t destSize, size_t size )
{
tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s %t", __FUNCTION__, tmSendCallStack( TELEMETRY_LEVEL0, 0 ) );
if( ThreadInMainThread() )
{
tmPlotI32( TELEMETRY_LEVEL0, TMPT_MEMORY, 0, size, "FileBytesRead" );
}
// read (size) of bytes to ensure truncated reads returns bytes read and not 0
return fread( dest, 1, size, m_pFile );
}
#define WRITE_CHUNK (256 * 1024)
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//
// This routine breaks data into chunks if the amount to be written is beyond WRITE_CHUNK (256kb)
// Windows can fail on monolithic writes of ~12MB or more, so we work around that here
//-----------------------------------------------------------------------------
size_t CStdioFile::FS_fwrite( const void *src, size_t size )
{
tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s %t", __FUNCTION__, tmSendCallStack( TELEMETRY_LEVEL0, 0 ) );
if( ThreadInMainThread() )
{
tmPlotI32( TELEMETRY_LEVEL0, TMPT_MEMORY, 0, size, "FileBytesWrite" );
}
if ( size > WRITE_CHUNK )
{
size_t remaining = size;
const byte* current = (const byte *) src;
size_t total = 0;
while ( remaining > 0 )
{
size_t bytesToCopy = min(remaining, (size_t)WRITE_CHUNK);
total += fwrite(current, 1, bytesToCopy, m_pFile);
remaining -= bytesToCopy;
current += bytesToCopy;
}
Assert( total == size );
return total;
}
return fwrite(src, 1, size, m_pFile);// return number of bytes written (because we have size = 1, count = bytes, so it return bytes)
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
bool CStdioFile::FS_setmode( FileMode_t mode )
{
#ifdef _WIN32
int fd = _fileno( m_pFile );
int newMode = ( mode == FM_BINARY ) ? _O_BINARY : _O_TEXT;
return ( _setmode( fd, newMode) != -1 );
#else
return false;
#endif
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
size_t CStdioFile::FS_vfprintf( const char *fmt, va_list list )
{
return vfprintf(m_pFile, fmt, list);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CStdioFile::FS_ferror()
{
return ferror(m_pFile);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CStdioFile::FS_fflush()
{
return fflush(m_pFile);
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
char *CStdioFile::FS_fgets( char *dest, int destSize )
{
return fgets(dest, destSize, m_pFile);
}
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
#ifdef _WIN32
ConVar filesystem_use_overlapped_io( "filesystem_use_overlapped_io", "1", 0, "" );
#define UseOverlappedIO() filesystem_use_overlapped_io.GetBool()
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
int GetSectorSize( const char *pszFilename )
{
if ( ( !pszFilename[0] || !pszFilename[1] ) ||
( pszFilename[0] == '\\' && pszFilename[1] == '\\' ) ||
( pszFilename[0] == '/' && pszFilename[1] == '/' ) )
{
// Cannot determine sector size with a UNC path (need volume identifier)
return 0;
}
if ( IsX360() )
{
// purposely dvd centric, which is also the worst case
return XBOX_DVD_SECTORSIZE;
}
#if defined( _WIN32 ) && !defined( FILESYSTEM_STEAM ) && !defined( _X360 )
char szAbsoluteFilename[MAX_FILEPATH];
if ( pszFilename[1] != ':' )
{
Q_MakeAbsolutePath( szAbsoluteFilename, sizeof(szAbsoluteFilename), pszFilename );
pszFilename = szAbsoluteFilename;
}
DWORD sectorSize = 1;
struct DriveSectorSize_t
{
char volume;
DWORD sectorSize;
};
static DriveSectorSize_t cachedSizes[4];
char volume = tolower( *pszFilename );
int i;
for ( i = 0; i < ARRAYSIZE(cachedSizes) && cachedSizes[i].volume; i++ )
{
if ( cachedSizes[i].volume == volume )
{
sectorSize = cachedSizes[i].sectorSize;
break;
}
}
if ( sectorSize == 1 )
{
char root[4] = "X:\\";
root[0] = *pszFilename;
DWORD ignored;
if ( !GetDiskFreeSpace( root, &ignored, &sectorSize, &ignored, &ignored ) )
{
sectorSize = 0;
}
if ( i < ARRAYSIZE(cachedSizes) )
{
cachedSizes[i].volume = volume;
cachedSizes[i].sectorSize = sectorSize;
}
}
return sectorSize;
#else
return 0;
#endif
}
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
class CThreadIOEventPool
{
public:
~CThreadIOEventPool()
{
CThreadEvent *pEvent;
while ( m_Events.PopItem( &pEvent ) )
{
delete pEvent;
}
}
CThreadEvent *GetEvent()
{
CThreadEvent *pEvent;
if ( m_Events.PopItem( &pEvent ) )
{
return pEvent;
}
return new CThreadEvent;
}
void ReleaseEvent( CThreadEvent *pEvent )
{
m_Events.PushItem( pEvent );
}
private:
CTSList<CThreadEvent *> m_Events;
};
CThreadIOEventPool g_ThreadIOEvents;
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
bool CWin32ReadOnlyFile::CanOpen( const char *filename, const char *options )
{
return ( options[0] == 'r' && options[1] == 'b' && options[2] == 0 && filesystem_native.GetBool() );
}
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
static HANDLE OpenWin32File( const char *filename, bool bOverlapped, bool bUnbuffered, int64 *pFileSize )
{
HANDLE hFile;
DWORD createFlags = FILE_ATTRIBUTE_NORMAL;
if ( bOverlapped )
{
createFlags |= FILE_FLAG_OVERLAPPED;
}
if ( bUnbuffered )
{
createFlags |= FILE_FLAG_NO_BUFFERING;
}
hFile = ::CreateFile( filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, createFlags, NULL );
if ( hFile != INVALID_HANDLE_VALUE && !*pFileSize )
{
LARGE_INTEGER fileSize;
if ( !GetFileSizeEx( hFile, &fileSize ) )
{
CloseHandle( hFile );
hFile = INVALID_HANDLE_VALUE;
}
*pFileSize = fileSize.QuadPart;
}
return hFile;
}
CWin32ReadOnlyFile *CWin32ReadOnlyFile::FS_fopen( const char *filename, const char *options, int64 *size )
{
Assert( CanOpen( filename, options ) );
int sectorSize = 0;
bool bTryUnbuffered = ( UseUnbufferedIO() && ( sectorSize = GetSectorSize( filename ) ) != 0 );
bool bOverlapped = UseOverlappedIO();
HANDLE hFileUnbuffered = INVALID_HANDLE_VALUE;
int64 fileSize = 0;
if ( bTryUnbuffered )
{
hFileUnbuffered = OpenWin32File( filename, bOverlapped, true, &fileSize );
if ( hFileUnbuffered == INVALID_HANDLE_VALUE )
{
return NULL;
}
}
HANDLE hFileBuffered = OpenWin32File( filename, bOverlapped, false, &fileSize );
if ( hFileBuffered == INVALID_HANDLE_VALUE )
{
if ( hFileUnbuffered != INVALID_HANDLE_VALUE )
{
CloseHandle( hFileUnbuffered );
}
return NULL;
}
if ( size )
{
*size = fileSize;
}
return new CWin32ReadOnlyFile( hFileUnbuffered, hFileBuffered, ( sectorSize ) ? sectorSize : 1, fileSize, bOverlapped );
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CWin32ReadOnlyFile::FS_fclose()
{
if ( m_hFileUnbuffered != INVALID_HANDLE_VALUE )
{
CloseHandle( m_hFileUnbuffered );
}
if ( m_hFileBuffered != INVALID_HANDLE_VALUE )
{
CloseHandle( m_hFileBuffered );
}
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
void CWin32ReadOnlyFile::FS_fseek( int64 pos, int seekType )
{
switch ( seekType )
{
case SEEK_SET:
m_ReadPos = pos;
break;
case SEEK_CUR:
m_ReadPos += pos;
break;
case SEEK_END:
m_ReadPos = m_Size - pos;
break;
}
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
long CWin32ReadOnlyFile::FS_ftell()
{
return m_ReadPos;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
int CWin32ReadOnlyFile::FS_feof()
{
return ( m_ReadPos >= m_Size );
}
// ends up on a thread's stack, don't blindly increase without awareness of that implication
// 360 threads have small stacks, using small buffer of the worst case quantum sector size
#if !defined( _X360 )
#define READ_TEMP_BUFFER ( 32*1024 )
#else
#define READ_TEMP_BUFFER ( 2*XBOX_DVD_SECTORSIZE )
#endif
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
size_t CWin32ReadOnlyFile::FS_fread( void *dest, size_t destSize, size_t size )
{
VPROF_BUDGET( "CWin32ReadOnlyFile::FS_fread", VPROF_BUDGETGROUP_OTHER_FILESYSTEM );
tmZone( TELEMETRY_LEVEL0, TMZF_NONE, "%s %t", __FUNCTION__, tmSendCallStack( TELEMETRY_LEVEL0, 0 ) );
if( ThreadInMainThread() )
{
tmPlotI32( TELEMETRY_LEVEL0, TMPT_MEMORY, 0, size, "FileBytesRead" );
}
if ( !size || ( m_hFileUnbuffered == INVALID_HANDLE_VALUE && m_hFileBuffered == INVALID_HANDLE_VALUE ) )
{
return 0;
}
CThreadEvent *pEvent = NULL;
if ( destSize == (size_t)-1 )
{
destSize = size;
}
byte tempBuffer[READ_TEMP_BUFFER];
HANDLE hReadFile = m_hFileBuffered;
int nBytesToRead = size;
byte *pDest = (byte *)dest;
int64 offset = m_ReadPos;
if ( m_hFileUnbuffered != INVALID_HANDLE_VALUE )
{
const int destBaseAlign = ( IsX360() ) ? 4 : m_SectorSize;
bool bDestBaseIsAligned = ( (DWORD)dest % destBaseAlign == 0 );
bool bCanReadUnbufferedDirect = ( bDestBaseIsAligned && ( destSize % m_SectorSize == 0 ) && ( m_ReadPos % m_SectorSize == 0 ) );
if ( bCanReadUnbufferedDirect )
{
// fastest path, unbuffered
nBytesToRead = AlignValue( size, m_SectorSize );
hReadFile = m_hFileUnbuffered;
}
else
{
// not properly aligned, snap to alignments
// attempt to perform single unbuffered operation using stack buffer
int64 alignedOffset = AlignValue( ( m_ReadPos - m_SectorSize ) + 1, m_SectorSize );
unsigned int alignedBytesToRead = AlignValue( ( m_ReadPos - alignedOffset ) + size, m_SectorSize );
if ( alignedBytesToRead <= sizeof( tempBuffer ) - destBaseAlign )
{
// read operation can be performed as unbuffered follwed by a post fixup
nBytesToRead = alignedBytesToRead;
offset = alignedOffset;
pDest = AlignValue( tempBuffer, destBaseAlign );
hReadFile = m_hFileUnbuffered;
}
}
}
OVERLAPPED overlapped = { 0 };
if ( m_bOverlapped )
{
pEvent = g_ThreadIOEvents.GetEvent();
overlapped.hEvent = *pEvent;
}
#ifdef REPORT_BUFFERED_IO
if ( hReadFile == m_hFileBuffered && filesystem_report_buffered_io.GetBool() )
{
Msg( "Buffered Operation :(\n" );
}
#endif
// some disk drivers will fail if read is too large
static int MAX_READ = filesystem_max_stdio_read.GetInt()*1024*1024;
const int MIN_READ = 64*1024;
bool bReadOk = true;
DWORD nBytesRead = 0;
size_t result = 0;
int64 currentOffset = offset;
while ( bReadOk && nBytesToRead > 0 )
{
int nCurBytesToRead = min( nBytesToRead, MAX_READ );
DWORD nCurBytesRead = 0;
overlapped.Offset = currentOffset & 0xFFFFFFFF;
overlapped.OffsetHigh = ( currentOffset >> 32 ) & 0xFFFFFFFF;
bReadOk = ( ::ReadFile( hReadFile, pDest + nBytesRead, nCurBytesToRead, &nCurBytesRead, &overlapped ) != 0 );
if ( !bReadOk )
{
if ( m_bOverlapped && GetLastError() == ERROR_IO_PENDING )
{
bReadOk = true;
}
}
if ( bReadOk )
{
if ( !m_bOverlapped || GetOverlappedResult( hReadFile, &overlapped, &nCurBytesRead, true ) )
{
nBytesRead += nCurBytesRead;
nBytesToRead -= nCurBytesRead;
currentOffset += nCurBytesRead;
}
else
{
if ( m_bOverlapped )
{
if ( GetLastError() == ERROR_HANDLE_EOF )
{
nBytesToRead = 0; // we have hit the end of the file
}
else
{
bReadOk = false;
}
}
else
{
bReadOk = false;
}
}
if ( !m_bOverlapped && nCurBytesRead == 0 )
{
nBytesToRead = 0; // we have hit the end of the file
}
}
if ( nBytesToRead > 0 && nCurBytesRead == 0 ) // if you failed to ready anything this time then bail the loop
{
DevMsg( "Got zero length read" );
bReadOk = false;
}
else if ( !bReadOk )
{
DWORD dwError = GetLastError();
if ( IsX360() )
{
if ( dwError == ERROR_DISK_CORRUPT || dwError == ERROR_FILE_CORRUPT )
{
FSDirtyDiskReportFunc_t func = g_FileSystem_Stdio.GetDirtyDiskReportFunc();
if ( func )
{
func();
result = 0;
}
}
}
if ( dwError == ERROR_NO_SYSTEM_RESOURCES && MAX_READ > MIN_READ )
{
MAX_READ /= 2;
bReadOk = true;
DevMsg( "ERROR_NO_SYSTEM_RESOURCES: Reducing max read to %d bytes\n", MAX_READ );
}
else
{
DevMsg( "Unknown read error %d\n", dwError );
}
}
}
if ( bReadOk )
{
if ( nBytesRead && hReadFile == m_hFileUnbuffered && pDest != dest )
{
int nBytesExtra = ( m_ReadPos - offset );
nBytesRead -= nBytesExtra;
if ( nBytesRead )
{
memcpy( dest, (byte *)pDest + nBytesExtra, size );
}
}
result = min( (size_t)nBytesRead, size );
}
if ( m_bOverlapped )
{
pEvent->Reset();
g_ThreadIOEvents.ReleaseEvent( pEvent );
}
m_ReadPos += result;
return result;
}
//-----------------------------------------------------------------------------
// Purpose: low-level filesystem wrapper
//-----------------------------------------------------------------------------
char *CWin32ReadOnlyFile::FS_fgets( char *dest, int destSize )
{
if ( FS_feof() )
{
return NULL;
}
int nStartPos = m_ReadPos;
int nBytesRead = FS_fread( dest, destSize, destSize );
if ( !nBytesRead )
{
return NULL;
}
dest[min( nBytesRead, destSize - 1)] = 0;
char *pNewline = strchr( dest, '\n' );
if ( pNewline )
{
// advance past, leave \n
pNewline++;
*pNewline = 0;
}
else
{
pNewline = &dest[min( nBytesRead, destSize - 1)];
}
m_ReadPos = nStartPos + ( pNewline - dest ) + 1;
return dest;
}
#endif // _WIN32