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|
/*************************************************************************
*
* $RCSfile: strmunx.cxx,v $
*
* $Revision: 1.5 $
*
* last change: $Author: hr $ $Date: 2003-03-27 17:04:46 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://www.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <stdlib.h> // fuer getenv()
#include <debug.hxx>
#include <fsys.hxx>
#include <stream.hxx>
#include <vos/mutex.hxx>
#include <osl/thread.h> // osl_getThreadTextEncoding
// class FileBase
#ifndef _OSL_FILE_HXX_
#include <osl/file.hxx>
#endif
using namespace osl;
// -----------------------------------------------------------------------
// ----------------
// - InternalLock -
// ----------------
class InternalStreamLock;
DECLARE_LIST( InternalStreamLockList, InternalStreamLock* );
class InternalStreamLock
{
ULONG m_nStartPos;
ULONG m_nEndPos;
SvFileStream* m_pStream;
struct stat m_aStat;
static InternalStreamLockList LockList;
#ifndef BOOTSTRAP
static NAMESPACE_VOS(OMutex) LockMutex;
#endif
InternalStreamLock( ULONG, ULONG, SvFileStream* );
~InternalStreamLock();
public:
static BOOL LockFile( ULONG nStart, ULONG nEnd, SvFileStream* );
static void UnlockFile( ULONG nStart, ULONG nEnd, SvFileStream* );
};
InternalStreamLockList InternalStreamLock::LockList;
#ifndef BOOTSTRAP
NAMESPACE_VOS(OMutex) InternalStreamLock::LockMutex;
#endif
InternalStreamLock::InternalStreamLock(
ULONG nStart,
ULONG nEnd,
SvFileStream* pStream ) :
m_nStartPos( nStart ),
m_nEndPos( nEnd ),
m_pStream( pStream )
{
ByteString aFileName(m_pStream->GetFileName(), osl_getThreadTextEncoding());
stat( aFileName.GetBuffer(), &m_aStat );
LockList.Insert( this, LIST_APPEND );
#ifdef DEBUG
fprintf( stderr, "locked %s", aFileName.GetBuffer() );
if( m_nStartPos || m_nEndPos )
fprintf(stderr, " [ %d ... %d ]", m_nStartPos, m_nEndPos );
fprintf( stderr, "\n" );
#endif
}
InternalStreamLock::~InternalStreamLock()
{
LockList.Remove( this );
#ifdef DEBUG
ByteString aFileName(m_pStream->GetFileName(), osl_getThreadTextEncoding());
fprintf( stderr, "unlocked %s", aFileName.GetBuffer() );
if( m_nStartPos || m_nEndPos )
fprintf(stderr, " [ %d ... %d ]", m_nStartPos, m_nEndPos );
fprintf( stderr, "\n" );
#endif
}
BOOL InternalStreamLock::LockFile( ULONG nStart, ULONG nEnd, SvFileStream* pStream )
{
#ifndef BOOTSTRAP
NAMESPACE_VOS( OGuard ) aGuard( LockMutex );
#endif
ByteString aFileName(pStream->GetFileName(), osl_getThreadTextEncoding());
struct stat aStat;
if( stat( aFileName.GetBuffer(), &aStat ) )
return FALSE;
if( S_ISDIR( aStat.st_mode ) )
return TRUE;
InternalStreamLock* pLock = NULL;
for( int i = 0; i < LockList.Count(); i++ )
{
pLock = LockList.GetObject( i );
if( aStat.st_ino == pLock->m_aStat.st_ino )
{
BOOL bDenyByOptions = FALSE;
StreamMode nLockMode = pLock->m_pStream->GetStreamMode();
StreamMode nNewMode = pStream->GetStreamMode();
if( nLockMode & STREAM_SHARE_DENYALL )
bDenyByOptions = TRUE;
else if( ( nLockMode & STREAM_SHARE_DENYWRITE ) &&
( nNewMode & STREAM_WRITE ) )
bDenyByOptions = TRUE;
else if( ( nLockMode & STREAM_SHARE_DENYREAD ) &&
( nNewMode & STREAM_READ ) )
bDenyByOptions = TRUE;
if( bDenyByOptions )
{
if( pLock->m_nStartPos == 0 && pLock->m_nEndPos == 0 ) // whole file is already locked
return FALSE;
if( nStart == 0 && nEnd == 0) // cannot lock whole file
return FALSE;
if( ( nStart < pLock->m_nStartPos && nEnd > pLock->m_nStartPos ) ||
( nStart < pLock->m_nEndPos && nEnd > pLock->m_nEndPos ) )
return FALSE;
}
}
}
pLock = new InternalStreamLock( nStart, nEnd, pStream );
return TRUE;
}
void InternalStreamLock::UnlockFile( ULONG nStart, ULONG nEnd, SvFileStream* pStream )
{
#ifndef BOOTSTRAP
NAMESPACE_VOS( OGuard ) aGuard( LockMutex );
#endif
InternalStreamLock* pLock = NULL;
if( nStart == 0 && nEnd == 0 )
{
for( int i = 0; i < LockList.Count(); i++ )
{
if( ( pLock = LockList.GetObject( i ) )->m_pStream == pStream )
{
delete pLock;
i--;
}
}
return;
}
for( int i = 0; i < LockList.Count(); i++ )
{
if( ( pLock = LockList.GetObject( i ) )->m_pStream == pStream &&
nStart == pLock->m_nStartPos && nEnd == pLock->m_nEndPos )
{
delete pLock;
return;
}
}
}
// --------------
// - StreamData -
// --------------
class StreamData
{
public:
int nHandle;
StreamData() { nHandle = 0; }
};
// -----------------------------------------------------------------------
static ULONG GetSvError( int nErrno )
{
static struct { int nErr; ULONG sv; } errArr[] =
{
{ 0, SVSTREAM_OK },
{ EACCES, SVSTREAM_ACCESS_DENIED },
{ EBADF, SVSTREAM_INVALID_HANDLE },
#if defined( RS6000 ) || defined( ALPHA ) || defined( HP9000 ) || defined( NETBSD ) || defined(FREEBSD) || defined(MACOSX)
{ EDEADLK, SVSTREAM_LOCKING_VIOLATION },
#else
{ EDEADLOCK, SVSTREAM_LOCKING_VIOLATION },
#endif
{ EINVAL, SVSTREAM_INVALID_PARAMETER },
{ EMFILE, SVSTREAM_TOO_MANY_OPEN_FILES },
{ ENFILE, SVSTREAM_TOO_MANY_OPEN_FILES },
{ ENOENT, SVSTREAM_FILE_NOT_FOUND },
{ EPERM, SVSTREAM_ACCESS_DENIED },
{ EROFS, SVSTREAM_ACCESS_DENIED },
{ EAGAIN, SVSTREAM_LOCKING_VIOLATION },
{ EISDIR, SVSTREAM_PATH_NOT_FOUND },
{ ELOOP, SVSTREAM_PATH_NOT_FOUND },
#if ! defined( RS6000 ) && ! defined( ALPHA ) && ! defined( NETBSD ) && ! defined (FREEBSD) && ! defined (MACOSX)
{ EMULTIHOP, SVSTREAM_PATH_NOT_FOUND },
{ ENOLINK, SVSTREAM_PATH_NOT_FOUND },
#endif
{ ENOTDIR, SVSTREAM_PATH_NOT_FOUND },
{ ETXTBSY, SVSTREAM_ACCESS_DENIED },
{ EEXIST, SVSTREAM_CANNOT_MAKE },
{ ENOSPC, SVSTREAM_DISK_FULL },
{ (int)0xFFFF, SVSTREAM_GENERALERROR }
};
ULONG nRetVal = SVSTREAM_GENERALERROR; // Standardfehler
int i=0;
do
{
if ( errArr[i].nErr == nErrno )
{
nRetVal = errArr[i].sv;
break;
}
i++;
}
while( errArr[i].nErr != 0xFFFF );
return nRetVal;
}
/*************************************************************************
|*
|* SvFileStream::SvFileStream()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 08.06.94
|* Letzte Aenderung OV 08.06.94
|*
*************************************************************************/
SvFileStream::SvFileStream( const String& rFileName, StreamMode nOpenMode )
{
bIsOpen = FALSE;
nLockCounter = 0;
bIsWritable = FALSE;
pInstanceData = new StreamData;
SetBufferSize( 1024 );
// convert URL to SystemPath, if necessary
::rtl::OUString aSystemFileName;
if( FileBase::getSystemPathFromFileURL( rFileName , aSystemFileName ) != osl_File_E_None )
{
aSystemFileName = rFileName;
}
Open( aSystemFileName, nOpenMode );
}
/*************************************************************************
|*
|* SvFileStream::SvFileStream()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 22.11.94
|* Letzte Aenderung OV 22.11.94
|*
*************************************************************************/
SvFileStream::SvFileStream()
{
bIsOpen = FALSE;
nLockCounter = 0;
bIsWritable = FALSE;
pInstanceData = new StreamData;
SetBufferSize( 1024 );
}
/*************************************************************************
|*
|* SvFileStream::~SvFileStream()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 22.11.94
|* Letzte Aenderung OV 22.11.94
|*
*************************************************************************/
SvFileStream::~SvFileStream()
{
Close();
InternalStreamLock::UnlockFile( 0, 0, this );
if (pInstanceData)
delete pInstanceData;
}
/*************************************************************************
|*
|* SvFileStream::GetFileHandle()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 22.11.94
|* Letzte Aenderung OV 22.11.94
|*
*************************************************************************/
ULONG SvFileStream::GetFileHandle() const
{
return (ULONG)pInstanceData->nHandle;
}
/*************************************************************************
|*
|* SvFileStream::IsA()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 14.06.94
|* Letzte Aenderung OV 14.06.94
|*
*************************************************************************/
USHORT SvFileStream::IsA() const
{
return ID_FILESTREAM;
}
/*************************************************************************
|*
|* SvFileStream::GetData()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
ULONG SvFileStream::GetData( void* pData, ULONG nSize )
{
#ifdef DBG_UTIL
ByteString aTraceStr( "SvFileStream::GetData(): " );
aTraceStr += nSize;
aTraceStr += " Bytes from ";
aTraceStr += ByteString(aFilename, osl_getThreadTextEncoding());
DBG_TRACE( aTraceStr.GetBuffer() );
#endif
int nRead = 0;
if ( IsOpen() )
{
nRead= read(pInstanceData->nHandle,pData,(unsigned)nSize);
if ( nRead == -1 )
SetError( ::GetSvError( errno ));
}
return (ULONG)nRead;
}
/*************************************************************************
|*
|* SvFileStream::PutData()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
ULONG SvFileStream::PutData( const void* pData, ULONG nSize )
{
#ifdef DBG_UTIL
ByteString aTraceStr( "SvFileStrean::PutData: " );
aTraceStr += nSize;
aTraceStr += " Bytes to ";
aTraceStr += ByteString(aFilename, osl_getThreadTextEncoding());
DBG_TRACE( aTraceStr.GetBuffer() );
#endif
int nWrite = 0;
if ( IsOpen() )
{
nWrite= write(pInstanceData->nHandle,pData,(unsigned)nSize);
if ( nWrite == -1 )
SetError( ::GetSvError( errno ) );
else if( !nWrite )
SetError( SVSTREAM_DISK_FULL );
}
return (ULONG)nWrite;
}
/*************************************************************************
|*
|* SvFileStream::SeekPos()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
ULONG SvFileStream::SeekPos( ULONG nPos )
{
if ( IsOpen() )
{
long nNewPos;
if ( nPos != STREAM_SEEK_TO_END )
nNewPos = lseek( pInstanceData->nHandle, (long)nPos, SEEK_SET );
else
nNewPos = lseek( pInstanceData->nHandle, 0L, SEEK_END );
if ( nNewPos == -1 )
{
SetError( SVSTREAM_SEEK_ERROR );
return 0L;
}
// langsam aber sicherer als return nNewPos
return lseek(pInstanceData->nHandle,0L,SEEK_CUR);
// return nNewPos;
}
SetError( SVSTREAM_GENERALERROR );
return 0L;
}
/*************************************************************************
|*
|* SvFileStream::FlushData()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
void SvFileStream::FlushData()
{
// lokal gibt es nicht
}
static char *pFileLockEnvVar = (char*)1;
/*************************************************************************
|*
|* SvFileStream::LockRange()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
BOOL SvFileStream::LockRange( ULONG nByteOffset, ULONG nBytes )
{
struct flock aflock;
aflock.l_start = nByteOffset;
aflock.l_whence = SEEK_SET;
aflock.l_len = nBytes;
int nLockMode = 0;
if ( ! IsOpen() )
return FALSE;
if ( eStreamMode & STREAM_SHARE_DENYALL )
if (bIsWritable)
nLockMode = F_WRLCK;
else
nLockMode = F_RDLCK;
if ( eStreamMode & STREAM_SHARE_DENYREAD )
if (bIsWritable)
nLockMode = F_WRLCK;
else
{
SetError(SVSTREAM_LOCKING_VIOLATION);
return FALSE;
}
if ( eStreamMode & STREAM_SHARE_DENYWRITE )
if (bIsWritable)
nLockMode = F_WRLCK;
else
nLockMode = F_RDLCK;
if (!nLockMode)
return TRUE;
if( ! InternalStreamLock::LockFile( nByteOffset, nByteOffset+nBytes, this ) )
{
#ifdef DEBUG
fprintf( stderr, "InternalLock on %s [ %d ... %d ] failed\n",
ByteString(aFilename, osl_getThreadTextEncoding()).GetBuffer(), nByteOffset, nByteOffset+nBytes );
#endif
return FALSE;
}
// HACK: File-Locking nur via Environmentvariable einschalten
// um einen Haenger im Zusammenspiel mit einem Linux
// NFS-2-Server (kein Lockdaemon) zu verhindern.
// File-Locking ?ber NFS ist generell ein Performancekiller.
// HR, 22.10.1997 fuer SOLARIS
// CP, 30.11.1997 fuer HPUX
// ER, 18.12.1997 fuer IRIX
// HR, 18.05.1998 Environmentvariable
if ( pFileLockEnvVar == (char*)1 )
pFileLockEnvVar = getenv("STAR_ENABLE_FILE_LOCKING");
if ( ! pFileLockEnvVar )
return TRUE;
aflock.l_type = nLockMode;
if (fcntl(pInstanceData->nHandle, F_GETLK, &aflock) == -1)
{
#if ( defined HPUX && defined BAD_UNION )
#ifdef DBG_UTIL
fprintf( stderr, "***** FCNTL(lock):errno = %d\n", errno );
#endif
if ( errno == EINVAL || errno == ENOSYS )
return TRUE;
#endif
#if defined SINIX
if (errno == EINVAL)
return TRUE;
#endif
#if defined SOLARIS
if (errno == ENOSYS)
return TRUE;
#endif
SetError( ::GetSvError( errno ));
return FALSE;
}
if (aflock.l_type != F_UNLCK)
{
SetError(SVSTREAM_LOCKING_VIOLATION);
return FALSE;
}
aflock.l_type = nLockMode;
if (fcntl(pInstanceData->nHandle, F_SETLK, &aflock) == -1)
{
SetError( ::GetSvError( errno ));
return FALSE;
}
return TRUE;
}
/*************************************************************************
|*
|* SvFileStream::UnlockRange()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
BOOL SvFileStream::UnlockRange( ULONG nByteOffset, ULONG nBytes )
{
struct flock aflock;
aflock.l_type = F_UNLCK;
aflock.l_start = nByteOffset;
aflock.l_whence = SEEK_SET;
aflock.l_len = nBytes;
if ( ! IsOpen() )
return FALSE;
InternalStreamLock::UnlockFile( nByteOffset, nByteOffset+nBytes, this );
if ( ! (eStreamMode &
(STREAM_SHARE_DENYALL | STREAM_SHARE_DENYREAD | STREAM_SHARE_DENYWRITE)))
return TRUE;
// wenn File Locking ausgeschaltet, siehe SvFileStream::LockRange
if ( ! pFileLockEnvVar )
return TRUE;
if (fcntl(pInstanceData->nHandle, F_SETLK, &aflock) != -1)
return TRUE;
#if ( defined HPUX && defined BAD_UNION )
#ifdef DBG_UTIL
fprintf( stderr, "***** FCNTL(unlock):errno = %d\n", errno );
#endif
if ( errno == EINVAL || errno == ENOSYS )
return TRUE;
#endif
#if ( defined SINIX )
if (errno == EINVAL)
return TRUE;
#endif
SetError( ::GetSvError( errno ));
return FALSE;
}
/*************************************************************************
|*
|* SvFileStream::LockFile()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
BOOL SvFileStream::LockFile()
{
return LockRange( 0UL, 0UL );
}
/*************************************************************************
|*
|* SvFileStream::UnlockFile()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
BOOL SvFileStream::UnlockFile()
{
return UnlockRange( 0UL, 0UL );
}
/*************************************************************************
|*
|* SvFileStream::Open()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
void SvFileStream::Open( const String& rFilename, StreamMode nOpenMode )
{
int nAccess, nAccessRW;
int nMode;
int nHandleTmp;
struct stat buf;
BOOL bStatValid = FALSE;
Close();
errno = 0;
eStreamMode = nOpenMode;
eStreamMode &= ~STREAM_TRUNC; // beim ReOpen nicht cutten
// !!! NoOp: Ansonsten ToAbs() verwendern
// !!! DirEntry aDirEntry( rFilename );
// !!! aFilename = aDirEntry.GetFull();
aFilename = rFilename;
#ifndef BOOTSTRAP
FSysRedirector::DoRedirect( aFilename );
#endif
ByteString aLocalFilename(aFilename, osl_getThreadTextEncoding());
#ifdef DBG_UTIL
ByteString aTraceStr( "SvFileStream::Open(): " );
aTraceStr += aLocalFilename;
DBG_TRACE( aTraceStr.GetBuffer() );
#endif
if ( lstat( aLocalFilename.GetBuffer(), &buf ) == 0 )
{
bStatValid = TRUE;
// SvFileStream soll kein Directory oeffnen
if( S_ISDIR( buf.st_mode ) )
{
SetError( ::GetSvError( EISDIR ) );
return;
}
}
if ( !( nOpenMode & STREAM_WRITE ) )
nAccessRW = O_RDONLY;
else if ( !( nOpenMode & STREAM_READ ) )
nAccessRW = O_WRONLY;
else
nAccessRW = O_RDWR;
nAccess = 0;
// Fix (MDA, 18.01.95): Bei RD_ONLY nicht mit O_CREAT oeffnen
// Wichtig auf Read-Only-Dateisystemen (wie CDROM)
if ( (!( nOpenMode & STREAM_NOCREATE )) && ( nAccessRW != O_RDONLY ) )
nAccess |= O_CREAT;
if ( nOpenMode & STREAM_TRUNC )
nAccess |= O_TRUNC;
nMode = S_IREAD | S_IROTH | S_IRGRP;
if ( nOpenMode & STREAM_WRITE)
{
nMode |= (S_IWRITE | S_IWOTH | S_IWGRP);
if ( nOpenMode & STREAM_COPY_ON_SYMLINK )
{
if ( bStatValid && S_ISLNK( buf.st_mode ) < 0 )
{
char *pBuf = new char[ 1024+1 ];
if ( readlink( aLocalFilename.GetBuffer(), pBuf, 1024 ) > 0 )
{
if ( unlink(aLocalFilename.GetBuffer()) == 0 )
{
#ifdef DBG_UTIL
fprintf( stderr,
"Copying file on symbolic link (%s).\n",
aLocalFilename.GetBuffer() );
#endif
String aTmpString( pBuf, osl_getThreadTextEncoding() );
const DirEntry aSourceEntry( aTmpString );
const DirEntry aTargetEntry( aFilename );
FileCopier aFileCopier( aSourceEntry, aTargetEntry );
aFileCopier.Execute();
}
}
delete pBuf;
}
}
}
nHandleTmp = open(aLocalFilename.GetBuffer(),nAccessRW|nAccess, nMode );
if ( nHandleTmp == -1 )
{
if ( nAccessRW != O_RDONLY )
{
// auf Lesen runterschalten
nAccessRW = O_RDONLY;
nAccess = 0;
nMode = S_IREAD | S_IROTH | S_IRGRP;
nHandleTmp =open( aLocalFilename.GetBuffer(),
nAccessRW|nAccess,
nMode );
}
}
if ( nHandleTmp != -1 )
{
pInstanceData->nHandle = nHandleTmp;
bIsOpen = TRUE;
if ( nAccessRW != O_RDONLY )
bIsWritable = TRUE;
if ( !LockFile() ) // ganze Datei
{
close( nHandleTmp );
bIsOpen = FALSE;
bIsWritable = FALSE;
pInstanceData->nHandle = 0;
}
}
else
SetError( ::GetSvError( errno ) );
}
/*************************************************************************
|*
|* SvFileStream::ReOpen()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
void SvFileStream::ReOpen()
{
if ( !bIsOpen && aFilename.Len() )
Open( aFilename, eStreamMode );
}
/*************************************************************************
|*
|* SvFileStream::Close()
|*
|* Beschreibung STREAM.SDW
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
void SvFileStream::Close()
{
InternalStreamLock::UnlockFile( 0, 0, this );
if ( IsOpen() )
{
#ifdef DBG_UTIL
ByteString aTraceStr( "SvFileStream::Close(): " );
aTraceStr += ByteString(aFilename, osl_getThreadTextEncoding());
DBG_TRACE( aTraceStr.GetBuffer() );
#endif
Flush();
close( pInstanceData->nHandle );
pInstanceData->nHandle = 0;
}
bIsOpen = FALSE;
bIsWritable = FALSE;
SvStream::ClearBuffer();
SvStream::ClearError();
}
/*************************************************************************
|*
|* SvFileStream::ResetError()
|*
|* Beschreibung STREAM.SDW; Setzt Filepointer auf Dateianfang
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
void SvFileStream::ResetError()
{
SvStream::ClearError();
}
/*************************************************************************
|*
|* SvFileStream::SetSize()
|*
|* Beschreibung STREAM.SDW;
|* Ersterstellung OV 15.06.94
|* Letzte Aenderung OV 15.06.94
|*
*************************************************************************/
void SvFileStream::SetSize (ULONG nSize)
{
if (IsOpen())
{
int fd = pInstanceData->nHandle;
if (::ftruncate (fd, (off_t)nSize) < 0)
{
// Save original error.
ULONG nError = ::GetSvError (errno);
// Check against current size. Fail upon 'shrink'.
struct stat aStat;
if (::fstat (fd, &aStat) < 0)
{
SetError (nError);
return;
}
if ((0 <= nSize) && (nSize <= aStat.st_size))
{
// Failure upon 'shrink'. Return original error.
SetError (nError);
return;
}
// Save current position.
ULONG nCurPos = (ULONG)::lseek (fd, (off_t)0, SEEK_CUR);
if (nCurPos == (ULONG)(-1))
{
SetError (nError);
return;
}
// Try 'expand' via 'lseek()' and 'write()'.
if (::lseek (fd, (off_t)(nSize - 1), SEEK_SET) < 0)
{
SetError (nError);
return;
}
if (::write (fd, (char*)"", (size_t)1) < 0)
{
// Failure. Restore saved position.
if (::lseek (fd, (off_t)nCurPos, SEEK_SET) < 0)
{
// Double failure.
}
SetError (nError);
return;
}
// Success. Restore saved position.
if (::lseek (fd, (off_t)nCurPos, SEEK_SET) < 0)
{
SetError (nError);
return;
}
}
}
}
|