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d10f3979fc
hashcat/deps/unrar/file.cpp
Gabriele Gristina 5ec8c96840 fix unrar segfault on Apple Silicon by update deps
2023-05-19 21:24:23 +02:00

840 lines
21 KiB
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#include "rar.hpp"
File::File()
{
hFile=FILE_BAD_HANDLE;
*FileName=0;
NewFile=false;
LastWrite=false;
HandleType=FILE_HANDLENORMAL;
LineInput=false;
SkipClose=false;
ErrorType=FILE_SUCCESS;
OpenShared=false;
AllowDelete=true;
AllowExceptions=true;
PreserveAtime=false;
#ifdef _WIN_ALL
CreateMode=FMF_UNDEFINED;
#endif
ReadErrorMode=FREM_ASK;
TruncatedAfterReadError=false;
CurFilePos=0;
}
File::~File()
{
if (hFile!=FILE_BAD_HANDLE && !SkipClose)
if (NewFile)
Delete();
else
Close();
}
void File::operator = (File &SrcFile)
{
hFile=SrcFile.hFile;
NewFile=SrcFile.NewFile;
LastWrite=SrcFile.LastWrite;
HandleType=SrcFile.HandleType;
TruncatedAfterReadError=SrcFile.TruncatedAfterReadError;
wcsncpyz(FileName,SrcFile.FileName,ASIZE(FileName));
SrcFile.SkipClose=true;
}
bool File::Open(const wchar *Name,uint Mode)
{
ErrorType=FILE_SUCCESS;
FileHandle hNewFile;
bool OpenShared=File::OpenShared || (Mode & FMF_OPENSHARED)!=0;
bool UpdateMode=(Mode & FMF_UPDATE)!=0;
bool WriteMode=(Mode & FMF_WRITE)!=0;
#ifdef _WIN_ALL
uint Access=WriteMode ? GENERIC_WRITE:GENERIC_READ;
if (UpdateMode)
Access|=GENERIC_WRITE;
uint ShareMode=(Mode & FMF_OPENEXCLUSIVE) ? 0 : FILE_SHARE_READ;
if (OpenShared)
ShareMode|=FILE_SHARE_WRITE;
uint Flags=FILE_FLAG_SEQUENTIAL_SCAN;
FindData FD;
if (PreserveAtime)
Access|=FILE_WRITE_ATTRIBUTES; // Needed to preserve atime.
hNewFile=CreateFile(Name,Access,ShareMode,NULL,OPEN_EXISTING,Flags,NULL);
DWORD LastError;
if (hNewFile==FILE_BAD_HANDLE)
{
LastError=GetLastError();
wchar LongName[NM];
if (GetWinLongPath(Name,LongName,ASIZE(LongName)))
{
hNewFile=CreateFile(LongName,Access,ShareMode,NULL,OPEN_EXISTING,Flags,NULL);
// For archive names longer than 260 characters first CreateFile
// (without \\?\) fails and sets LastError to 3 (access denied).
// We need the correct "file not found" error code to decide
// if we create a new archive or quit with "cannot create" error.
// So we need to check the error code after \\?\ CreateFile again,
// otherwise we'll fail to create new archives with long names.
// But we cannot simply assign the new code to LastError,
// because it would break "..\arcname.rar" relative names processing.
// First CreateFile returns the correct "file not found" code for such
// names, but "\\?\" CreateFile returns ERROR_INVALID_NAME treating
// dots as a directory name. So we check only for "file not found"
// error here and for other errors use the first CreateFile result.
if (GetLastError()==ERROR_FILE_NOT_FOUND)
LastError=ERROR_FILE_NOT_FOUND;
}
}
if (hNewFile==FILE_BAD_HANDLE && LastError==ERROR_FILE_NOT_FOUND)
ErrorType=FILE_NOTFOUND;
if (PreserveAtime && hNewFile!=FILE_BAD_HANDLE)
{
FILETIME ft={0xffffffff,0xffffffff}; // This value prevents atime modification.
SetFileTime(hNewFile,NULL,&ft,NULL);
}
#else
int flags=UpdateMode ? O_RDWR:(WriteMode ? O_WRONLY:O_RDONLY);
#ifdef O_BINARY
flags|=O_BINARY;
#if defined(_AIX) && defined(_LARGE_FILE_API)
flags|=O_LARGEFILE;
#endif
#endif
// NDK r20 has O_NOATIME, but fails to create files with it in Android 7+.
#if defined(O_NOATIME)
if (PreserveAtime)
flags|=O_NOATIME;
#endif
char NameA[NM];
WideToChar(Name,NameA,ASIZE(NameA));
int handle=open(NameA,flags);
#ifdef LOCK_EX
#ifdef _OSF_SOURCE
extern "C" int flock(int, int);
#endif
if (!OpenShared && UpdateMode && handle>=0 && flock(handle,LOCK_EX|LOCK_NB)==-1)
{
close(handle);
return false;
}
#endif
if (handle==-1)
hNewFile=FILE_BAD_HANDLE;
else
{
#ifdef FILE_USE_OPEN
hNewFile=handle;
#else
hNewFile=fdopen(handle,UpdateMode ? UPDATEBINARY:READBINARY);
#endif
}
if (hNewFile==FILE_BAD_HANDLE && errno==ENOENT)
ErrorType=FILE_NOTFOUND;
#endif
NewFile=false;
HandleType=FILE_HANDLENORMAL;
SkipClose=false;
bool Success=hNewFile!=FILE_BAD_HANDLE;
if (Success)
{
hFile=hNewFile;
wcsncpyz(FileName,Name,ASIZE(FileName));
TruncatedAfterReadError=false;
}
return Success;
}
#if !defined(SFX_MODULE)
void File::TOpen(const wchar *Name)
{
if (!WOpen(Name))
ErrHandler.Exit(RARX_OPEN);
}
#endif
bool File::WOpen(const wchar *Name)
{
if (Open(Name))
return true;
ErrHandler.OpenErrorMsg(Name);
return false;
}
bool File::Create(const wchar *Name,uint Mode)
{
// OpenIndiana based NAS and CIFS shares fail to set the file time if file
// was created in read+write mode and some data was written and not flushed
// before SetFileTime call. So we should use the write only mode if we plan
// SetFileTime call and do not need to read from file.
bool WriteMode=(Mode & FMF_WRITE)!=0;
bool ShareRead=(Mode & FMF_SHAREREAD)!=0 || File::OpenShared;
#ifdef _WIN_ALL
CreateMode=Mode;
uint Access=WriteMode ? GENERIC_WRITE:GENERIC_READ|GENERIC_WRITE;
DWORD ShareMode=ShareRead ? FILE_SHARE_READ:0;
// Windows automatically removes dots and spaces in the end of file name,
// So we detect such names and process them with \\?\ prefix.
wchar *LastChar=PointToLastChar(Name);
bool Special=*LastChar=='.' || *LastChar==' ';
if (Special && (Mode & FMF_STANDARDNAMES)==0)
hFile=FILE_BAD_HANDLE;
else
hFile=CreateFile(Name,Access,ShareMode,NULL,CREATE_ALWAYS,0,NULL);
if (hFile==FILE_BAD_HANDLE)
{
wchar LongName[NM];
if (GetWinLongPath(Name,LongName,ASIZE(LongName)))
hFile=CreateFile(LongName,Access,ShareMode,NULL,CREATE_ALWAYS,0,NULL);
}
#else
char NameA[NM];
WideToChar(Name,NameA,ASIZE(NameA));
#ifdef FILE_USE_OPEN
hFile=open(NameA,(O_CREAT|O_TRUNC) | (WriteMode ? O_WRONLY : O_RDWR),0666);
#else
hFile=fopen(NameA,WriteMode ? WRITEBINARY:CREATEBINARY);
#endif
#endif
NewFile=true;
HandleType=FILE_HANDLENORMAL;
SkipClose=false;
wcsncpyz(FileName,Name,ASIZE(FileName));
return hFile!=FILE_BAD_HANDLE;
}
#if !defined(SFX_MODULE)
void File::TCreate(const wchar *Name,uint Mode)
{
if (!WCreate(Name,Mode))
ErrHandler.Exit(RARX_FATAL);
}
#endif
bool File::WCreate(const wchar *Name,uint Mode)
{
if (Create(Name,Mode))
return true;
ErrHandler.CreateErrorMsg(Name);
return false;
}
bool File::Close()
{
bool Success=true;
if (hFile!=FILE_BAD_HANDLE)
{
if (!SkipClose)
{
#ifdef _WIN_ALL
// We use the standard system handle for stdout in Windows
// and it must not be closed here.
if (HandleType==FILE_HANDLENORMAL)
Success=CloseHandle(hFile)==TRUE;
#else
#ifdef FILE_USE_OPEN
Success=close(hFile)!=-1;
#else
Success=fclose(hFile)!=EOF;
#endif
#endif
}
hFile=FILE_BAD_HANDLE;
}
HandleType=FILE_HANDLENORMAL;
if (!Success && AllowExceptions)
ErrHandler.CloseError(FileName);
return Success;
}
bool File::Delete()
{
if (HandleType!=FILE_HANDLENORMAL)
return false;
if (hFile!=FILE_BAD_HANDLE)
Close();
if (!AllowDelete)
return false;
return DelFile(FileName);
}
bool File::Rename(const wchar *NewName)
{
// No need to rename if names are already same.
bool Success=wcscmp(FileName,NewName)==0;
if (!Success)
Success=RenameFile(FileName,NewName);
if (Success)
wcsncpyz(FileName,NewName,ASIZE(FileName));
return Success;
}
bool File::Write(const void *Data,size_t Size)
{
if (Size==0)
return true;
if (HandleType==FILE_HANDLESTD)
{
#ifdef _WIN_ALL
hFile=GetStdHandle(STD_OUTPUT_HANDLE);
#else
// Cannot use the standard stdout here, because it already has wide orientation.
if (hFile==FILE_BAD_HANDLE)
{
#ifdef FILE_USE_OPEN
hFile=dup(STDOUT_FILENO); // Open new stdout stream.
#else
hFile=fdopen(dup(STDOUT_FILENO),"w"); // Open new stdout stream.
#endif
}
#endif
}
bool Success;
while (1)
{
Success=false;
#ifdef _WIN_ALL
DWORD Written=0;
if (HandleType!=FILE_HANDLENORMAL)
{
// writing to stdout can fail in old Windows if data block is too large
const size_t MaxSize=0x4000;
for (size_t I=0;I<Size;I+=MaxSize)
{
Success=WriteFile(hFile,(byte *)Data+I,(DWORD)Min(Size-I,MaxSize),&Written,NULL)==TRUE;
if (!Success)
break;
}
}
else
Success=WriteFile(hFile,Data,(DWORD)Size,&Written,NULL)==TRUE;
#else
#ifdef FILE_USE_OPEN
ssize_t Written=write(hFile,Data,Size);
Success=Written==Size;
#else
int Written=fwrite(Data,1,Size,hFile);
Success=Written==Size && !ferror(hFile);
#endif
#endif
if (!Success && AllowExceptions && HandleType==FILE_HANDLENORMAL)
{
#if defined(_WIN_ALL) && !defined(SFX_MODULE) && !defined(RARDLL)
int ErrCode=GetLastError();
int64 FilePos=Tell();
uint64 FreeSize=GetFreeDisk(FileName);
SetLastError(ErrCode);
if (FreeSize>Size && FilePos-Size<=0xffffffff && FilePos+Size>0xffffffff)
ErrHandler.WriteErrorFAT(FileName);
#endif
if (ErrHandler.AskRepeatWrite(FileName,false))
{
#if !defined(_WIN_ALL) && !defined(FILE_USE_OPEN)
clearerr(hFile);
#endif
if (Written<Size && Written>0)
Seek(Tell()-Written,SEEK_SET);
continue;
}
ErrHandler.WriteError(NULL,FileName);
}
break;
}
LastWrite=true;
return Success; // It can return false only if AllowExceptions is disabled.
}
int File::Read(void *Data,size_t Size)
{
if (TruncatedAfterReadError)
return 0;
int64 FilePos=0; // Initialized only to suppress some compilers warning.
if (ReadErrorMode==FREM_IGNORE)
FilePos=Tell();
int TotalRead=0;
while (true)
{
int ReadSize=DirectRead(Data,Size);
if (ReadSize==-1)
{
ErrorType=FILE_READERROR;
if (AllowExceptions)
if (ReadErrorMode==FREM_IGNORE)
{
ReadSize=0;
for (size_t I=0;I<Size;I+=512)
{
Seek(FilePos+I,SEEK_SET);
size_t SizeToRead=Min(Size-I,512);
int ReadCode=DirectRead(Data,SizeToRead);
ReadSize+=(ReadCode==-1) ? 512:ReadCode;
if (ReadSize!=-1)
TotalRead+=ReadSize;
}
}
else
{
bool Ignore=false,Retry=false,Quit=false;
if (ReadErrorMode==FREM_ASK && HandleType==FILE_HANDLENORMAL)
{
ErrHandler.AskRepeatRead(FileName,Ignore,Retry,Quit);
if (Retry)
continue;
}
if (Ignore || ReadErrorMode==FREM_TRUNCATE)
{
TruncatedAfterReadError=true;
return 0;
}
ErrHandler.ReadError(FileName);
}
}
TotalRead+=ReadSize; // If ReadSize is -1, TotalRead is also set to -1 here.
if (HandleType==FILE_HANDLESTD && !LineInput && ReadSize>0 && (uint)ReadSize<Size)
{
// Unlike regular files, for pipe we can read only as much as was
// written at the other end of pipe. We had seen data coming in small
// ~80 byte chunks when piping from 'type arc.rar'. Extraction code
// would fail if we read an incomplete archive header from stdin.
// So here we ensure that requested size is completely read.
// But we return the available data immediately in "line input" mode,
// when processing user's input in console prompts. Otherwise apps
// piping user responses to multiple Ask() prompts can hang if no more
// data is available yet and pipe isn't closed.
Data=(byte*)Data+ReadSize;
Size-=ReadSize;
continue;
}
break;
}
if (TotalRead>0) // Can be -1 for error and AllowExceptions disabled.
CurFilePos+=TotalRead;
return TotalRead; // It can return -1 only if AllowExceptions is disabled.
}
// Returns -1 in case of error.
int File::DirectRead(void *Data,size_t Size)
{
#ifdef _WIN_ALL
const size_t MaxDeviceRead=20000;
const size_t MaxLockedRead=32768;
#endif
if (HandleType==FILE_HANDLESTD)
{
#ifdef _WIN_ALL
// if (Size>MaxDeviceRead)
// Size=MaxDeviceRead;
hFile=GetStdHandle(STD_INPUT_HANDLE);
#else
#ifdef FILE_USE_OPEN
hFile=STDIN_FILENO;
#else
hFile=stdin;
#endif
#endif
}
#ifdef _WIN_ALL
// For pipes like 'type file.txt | rar -si arcname' ReadFile may return
// data in small ~4KB blocks. It may slightly reduce the compression ratio.
DWORD Read;
if (!ReadFile(hFile,Data,(DWORD)Size,&Read,NULL))
{
if (IsDevice() && Size>MaxDeviceRead)
return DirectRead(Data,MaxDeviceRead);
if (HandleType==FILE_HANDLESTD && GetLastError()==ERROR_BROKEN_PIPE)
return 0;
// We had a bug report about failure to archive 1C database lock file
// 1Cv8tmp.1CL, which is a zero length file with a region above 200 KB
// permanently locked. If our first read request uses too large buffer
// and if we are in -dh mode, so we were able to open the file,
// we'll fail with "Read error". So now we use try a smaller buffer size
// in case of lock error.
if (HandleType==FILE_HANDLENORMAL && Size>MaxLockedRead &&
GetLastError()==ERROR_LOCK_VIOLATION)
return DirectRead(Data,MaxLockedRead);
return -1;
}
return Read;
#else
#ifdef FILE_USE_OPEN
ssize_t ReadSize=read(hFile,Data,Size);
if (ReadSize==-1)
return -1;
return (int)ReadSize;
#else
if (LastWrite)
{
fflush(hFile);
LastWrite=false;
}
clearerr(hFile);
size_t ReadSize=fread(Data,1,Size,hFile);
if (ferror(hFile))
return -1;
return (int)ReadSize;
#endif
#endif
}
void File::Seek(int64 Offset,int Method)
{
if (!RawSeek(Offset,Method) && AllowExceptions)
ErrHandler.SeekError(FileName);
}
bool File::RawSeek(int64 Offset,int Method)
{
if (hFile==FILE_BAD_HANDLE)
return true;
if (!IsSeekable()) // To extract archives from stdin with -si.
{
// We tried to dynamically allocate 32 KB buffer here, but it improved
// speed in Windows 10 by mere ~1.5%.
byte Buf[4096];
if (Method==SEEK_CUR || Method==SEEK_SET && Offset>=CurFilePos)
{
uint64 SkipSize=Method==SEEK_CUR ? Offset:Offset-CurFilePos;
while (SkipSize>0) // Reading to emulate seek forward.
{
int ReadSize=Read(Buf,(size_t)Min(SkipSize,ASIZE(Buf)));
if (ReadSize<=0)
return false;
SkipSize-=ReadSize;
CurFilePos+=ReadSize;
}
return true;
}
// May need it in FileLength() in Archive::UnexpEndArcMsg() when unpacking
// RAR 4.x archives without the end of archive block created with -en.
if (Method==SEEK_END)
{
int ReadSize;
while ((ReadSize=Read(Buf,ASIZE(Buf)))>0)
CurFilePos+=ReadSize;
return true;
}
return false; // Backward seek on unseekable file.
}
if (Offset<0 && Method!=SEEK_SET)
{
Offset=(Method==SEEK_CUR ? Tell():FileLength())+Offset;
Method=SEEK_SET;
}
#ifdef _WIN_ALL
LONG HighDist=(LONG)(Offset>>32);
if (SetFilePointer(hFile,(LONG)Offset,&HighDist,Method)==0xffffffff &&
GetLastError()!=NO_ERROR)
return false;
#else
LastWrite=false;
#ifdef FILE_USE_OPEN
if (lseek(hFile,(off_t)Offset,Method)==-1)
return false;
#elif defined(_LARGEFILE_SOURCE) && !defined(_OSF_SOURCE) && !defined(__VMS)
if (fseeko(hFile,Offset,Method)!=0)
return false;
#else
if (fseek(hFile,(long)Offset,Method)!=0)
return false;
#endif
#endif
return true;
}
int64 File::Tell()
{
if (hFile==FILE_BAD_HANDLE)
if (AllowExceptions)
ErrHandler.SeekError(FileName);
else
return -1;
if (!IsSeekable())
return CurFilePos;
#ifdef _WIN_ALL
LONG HighDist=0;
uint LowDist=SetFilePointer(hFile,0,&HighDist,FILE_CURRENT);
if (LowDist==0xffffffff && GetLastError()!=NO_ERROR)
if (AllowExceptions)
ErrHandler.SeekError(FileName);
else
return -1;
return INT32TO64(HighDist,LowDist);
#else
#ifdef FILE_USE_OPEN
return lseek(hFile,0,SEEK_CUR);
#elif defined(_LARGEFILE_SOURCE) && !defined(_OSF_SOURCE)
return ftello(hFile);
#else
return ftell(hFile);
#endif
#endif
}
void File::Prealloc(int64 Size)
{
#ifdef _WIN_ALL
if (RawSeek(Size,SEEK_SET))
{
Truncate();
Seek(0,SEEK_SET);
}
#endif
#if defined(_UNIX) && defined(USE_FALLOCATE)
// fallocate is rather new call. Only latest kernels support it.
// So we are not using it by default yet.
int fd = GetFD();
if (fd >= 0)
fallocate(fd, 0, 0, Size);
#endif
}
byte File::GetByte()
{
byte Byte=0;
Read(&Byte,1);
return Byte;
}
void File::PutByte(byte Byte)
{
Write(&Byte,1);
}
bool File::Truncate()
{
#ifdef _WIN_ALL
return SetEndOfFile(hFile)==TRUE;
#else
return ftruncate(GetFD(),(off_t)Tell())==0;
#endif
}
void File::Flush()
{
#ifdef _WIN_ALL
FlushFileBuffers(hFile);
#else
#ifndef FILE_USE_OPEN
fflush(hFile);
#endif
fsync(GetFD());
#endif
}
void File::SetOpenFileTime(RarTime *ftm,RarTime *ftc,RarTime *fta)
{
#ifdef _WIN_ALL
// Workaround for OpenIndiana NAS time bug. If we cannot create a file
// in write only mode, we need to flush the write buffer before calling
// SetFileTime or file time will not be changed.
if (CreateMode!=FMF_UNDEFINED && (CreateMode & FMF_WRITE)==0)
FlushFileBuffers(hFile);
bool sm=ftm!=NULL && ftm->IsSet();
bool sc=ftc!=NULL && ftc->IsSet();
bool sa=fta!=NULL && fta->IsSet();
FILETIME fm,fc,fa;
if (sm)
ftm->GetWinFT(&fm);
if (sc)
ftc->GetWinFT(&fc);
if (sa)
fta->GetWinFT(&fa);
SetFileTime(hFile,sc ? &fc:NULL,sa ? &fa:NULL,sm ? &fm:NULL);
#endif
}
void File::SetCloseFileTime(RarTime *ftm,RarTime *fta)
{
// Android APP_PLATFORM := android-14 does not support futimens and futimes.
// Newer platforms support futimens, but fail on Android 4.2.
// We have to use utime for Android.
// Also we noticed futimens fail to set timestamps on NTFS partition
// mounted to virtual Linux x86 machine, but utimensat worked correctly.
// So we set timestamps for already closed files in Unix.
#ifdef _UNIX
SetCloseFileTimeByName(FileName,ftm,fta);
#endif
}
void File::SetCloseFileTimeByName(const wchar *Name,RarTime *ftm,RarTime *fta)
{
#ifdef _UNIX
bool setm=ftm!=NULL && ftm->IsSet();
bool seta=fta!=NULL && fta->IsSet();
if (setm || seta)
{
char NameA[NM];
WideToChar(Name,NameA,ASIZE(NameA));
#ifdef UNIX_TIME_NS
timespec times[2];
times[0].tv_sec=seta ? fta->GetUnix() : 0;
times[0].tv_nsec=seta ? long(fta->GetUnixNS()%1000000000) : UTIME_NOW;
times[1].tv_sec=setm ? ftm->GetUnix() : 0;
times[1].tv_nsec=setm ? long(ftm->GetUnixNS()%1000000000) : UTIME_NOW;
utimensat(AT_FDCWD,NameA,times,0);
#else
utimbuf ut;
if (setm)
ut.modtime=ftm->GetUnix();
else
ut.modtime=fta->GetUnix(); // Need to set something, cannot left it 0.
if (seta)
ut.actime=fta->GetUnix();
else
ut.actime=ut.modtime; // Need to set something, cannot left it 0.
utime(NameA,&ut);
#endif
}
#endif
}
#ifdef _UNIX
void File::StatToRarTime(struct stat &st,RarTime *ftm,RarTime *ftc,RarTime *fta)
{
#ifdef UNIX_TIME_NS
#if defined(_APPLE)
if (ftm!=NULL) ftm->SetUnixNS(st.st_mtimespec.tv_sec*(uint64)1000000000+st.st_mtimespec.tv_nsec);
if (ftc!=NULL) ftc->SetUnixNS(st.st_ctimespec.tv_sec*(uint64)1000000000+st.st_ctimespec.tv_nsec);
if (fta!=NULL) fta->SetUnixNS(st.st_atimespec.tv_sec*(uint64)1000000000+st.st_atimespec.tv_nsec);
#else
if (ftm!=NULL) ftm->SetUnixNS(st.st_mtim.tv_sec*(uint64)1000000000+st.st_mtim.tv_nsec);
if (ftc!=NULL) ftc->SetUnixNS(st.st_ctim.tv_sec*(uint64)1000000000+st.st_ctim.tv_nsec);
if (fta!=NULL) fta->SetUnixNS(st.st_atim.tv_sec*(uint64)1000000000+st.st_atim.tv_nsec);
#endif
#else
if (ftm!=NULL) ftm->SetUnix(st.st_mtime);
if (ftc!=NULL) ftc->SetUnix(st.st_ctime);
if (fta!=NULL) fta->SetUnix(st.st_atime);
#endif
}
#endif
void File::GetOpenFileTime(RarTime *ftm,RarTime *ftc,RarTime *fta)
{
#ifdef _WIN_ALL
FILETIME ctime,atime,mtime;
GetFileTime(hFile,&ctime,&atime,&mtime);
if (ftm!=NULL) ftm->SetWinFT(&mtime);
if (ftc!=NULL) ftc->SetWinFT(&ctime);
if (fta!=NULL) fta->SetWinFT(&atime);
#elif defined(_UNIX)
struct stat st;
fstat(GetFD(),&st);
StatToRarTime(st,ftm,ftc,fta);
#endif
}
int64 File::FileLength()
{
int64 SavePos=Tell();
Seek(0,SEEK_END);
int64 Length=Tell();
Seek(SavePos,SEEK_SET);
return Length;
}
bool File::IsDevice()
{
if (hFile==FILE_BAD_HANDLE)
return false;
#ifdef _WIN_ALL
uint Type=GetFileType(hFile);
return Type==FILE_TYPE_CHAR || Type==FILE_TYPE_PIPE;
#else
return isatty(GetFD());
#endif
}
#ifndef SFX_MODULE
int64 File::Copy(File &Dest,int64 Length)
{
Array<byte> Buffer(File::CopyBufferSize());
int64 CopySize=0;
bool CopyAll=(Length==INT64NDF);
while (CopyAll || Length>0)
{
Wait();
size_t SizeToRead=(!CopyAll && Length<(int64)Buffer.Size()) ? (size_t)Length:Buffer.Size();
byte *Buf=&Buffer[0];
int ReadSize=Read(Buf,SizeToRead);
if (ReadSize==0)
break;
size_t WriteSize=ReadSize;
#ifdef _WIN_ALL
// For FAT32 USB flash drives in Windows if first write is 4 KB or more,
// write caching is disabled and "write through" is enabled, resulting
// in bad performance, especially for many small files. It happens when
// we create SFX archive on USB drive, because SFX module is written first.
// So we split the first write to small 1 KB followed by rest of data.
if (CopySize==0 && WriteSize>=4096)
{
const size_t FirstWrite=1024;
Dest.Write(Buf,FirstWrite);
Buf+=FirstWrite;
WriteSize-=FirstWrite;
}
#endif
Dest.Write(Buf,WriteSize);
CopySize+=ReadSize;
if (!CopyAll)
Length-=ReadSize;
}
return CopySize;
}
#endif
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