sl@0: // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "FDESC.H"
sl@0: #include "LPOSIX.H"
sl@0: #include "LTIME.H"
sl@0: #include <string.h>
sl@0: #include <stdio_r.h>
sl@0: #include <fcntl.h>		// for struct stat
sl@0: #include <sys/errno.h>		// for ENOTSOCK
sl@0: #include <sys/ioctl.h>
sl@0: #include <c32comm.h>
sl@0: 
sl@0: #include "POSIXIF.H"	// for details of CPosixRequest::iLink
sl@0: 
sl@0: // Cleanup support
sl@0: 
sl@0: void CFileDescBase::Cleanup(TAny *aPtr)
sl@0: 	{
sl@0: 	((CFileDescBase*)aPtr)->Close();
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::PushLC()
sl@0: 	{
sl@0: 	CleanupStack::PushL(TCleanupItem(Cleanup,this));
sl@0: 	}
sl@0: 
sl@0: // Private constructor
sl@0: 
sl@0: inline TPosixRequestQueue::TPosixRequestQueue() 
sl@0: : TSglQue<CPosixRequest>(_FOFF(CPosixRequest,iLink)) 
sl@0: 	{}
sl@0: 
sl@0: CFileDescBase::CFileDescBase() : iReadTimeout(-1)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: // A CFileDescBase factory function, for "named" file-like objects
sl@0: 
sl@0: //CFileDescBase* CFileDescBase::Open(RFs& aSession, const char* name, int mode, int perms, TInt& err)
sl@0: //CFileDescBase* CFileDescBase::Open(RFs& aSession, const wchar_t* name, int mode, int perms, TInt& err)
sl@0: CFileDescBase* CFileDescBase::Open(RSessionBase& aSession, const wchar_t* name, int mode, int perms, TInt& err)
sl@0: 	{
sl@0: 	CFileDescBase* ret=0;
sl@0: 
sl@0: 	if (wcscmp(name,L"CON:")==0)
sl@0: 		ret= new CTtyDesc;	// NB. This won't be the default stdin/stdout/stderr console
sl@0: 	else
sl@0: 	if (wcscmp(name,L"NUL:")==0)
sl@0: 		ret= new CFileDescBase;
sl@0: 	else
sl@0: 	if (wcscmp(name,L"TMP:")==0)
sl@0: 		{
sl@0: 		RFs& rfs = static_cast<RFs&>(aSession);
sl@0: 		TParse path;
sl@0: 		err=GetFullPath(path,(const TText16*)WIDEP_tmpdir, rfs,NULL);
sl@0: 		if (err)
sl@0: 			return 0;
sl@0: 		CTempFileDesc* tmp= new CTempFileDesc;
sl@0: 		if (tmp)
sl@0: 			{
sl@0: 			err=tmp->Open(rfs,path.DriveAndPath());
sl@0: 			if (err)
sl@0: 				{
sl@0: 				delete tmp;
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		ret=tmp;
sl@0: 		}
sl@0: 	else if	((L'C' == name[0]) && (L'O' == name[1]) && (L'M' == name[2]) && (L':' == name[4]) && ((name[3] >= L'1') && (name[3] <= L'9')) ||
sl@0: 			(L'I' == name[0]) && (L'R' == name[1]) && (L'C' == name[2]) && (L'O' == name[3]) && (L'M' == name[4]) && (L':' == name[6]) && ((name[5] >= L'1') && (name[5] <= L'9')))
sl@0: 		{
sl@0: 
sl@0: 		RCommServ& rcs = static_cast<RCommServ&>(aSession);
sl@0: 		if (!rcs.Handle())	
sl@0: 			{
sl@0: 			err=rcs.Connect();	//connect to the server
sl@0: 			if (err)
sl@0: 				return 0;
sl@0: 			}
sl@0: 		CSerialDesc * tmp = new CSerialDesc;
sl@0: 		if (tmp)
sl@0: 			{
sl@0: 			RCommServ& rcs = static_cast<RCommServ&>(aSession);
sl@0: 			CleanupStack::PushL(tmp);
sl@0: 			err = tmp->Open(rcs, name, mode, perms);
sl@0: 			CleanupStack::Pop(tmp);
sl@0: 			if (err)
sl@0: 				{
sl@0: 				delete tmp;
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		ret = tmp;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		TFullName fullName;
sl@0: 		RFs& rfs = static_cast<RFs&>(aSession);
sl@0: 		err=GetFullFile(fullName,(const TText16*)name,rfs);
sl@0: 		if (err)
sl@0: 			return 0;
sl@0: 		CFileDesc* f= new CFileDesc;
sl@0: 		if (f)
sl@0: 			{
sl@0: 			err=f->Open(rfs,fullName,mode,perms);
sl@0: 			if (err)
sl@0: 				{
sl@0: 				delete f;
sl@0: 				return 0;
sl@0: 				}
sl@0: 			}
sl@0: 		ret=f;
sl@0: 		}
sl@0: 	err=(ret==0)? KErrNoMemory:KErrNone;
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: // Useful default implementations for CFileDescBase virtual functions.
sl@0: 
sl@0: TInt CFileDescBase::LSeek (int& offset, int)
sl@0: 	{
sl@0: 	// minimal implementation for devices which can't seek
sl@0: 	offset=0;
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Read (TDes8& aBuf, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation for /dev/null
sl@0: 	aBuf.Zero();	// set length to zero
sl@0: 	TRequestStatus* sp=&aStatus;
sl@0: 	User::RequestComplete(sp,KErrNone);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::ReadCancel() {}
sl@0: 
sl@0: TInt CFileDescBase::ReadCompletion (TDes8& /*aBuf*/, TInt aStatus)
sl@0: 	{
sl@0: 	return aStatus;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TInt CFileDescBase::FStat (struct stat *st)
sl@0: 	{
sl@0: 	// minimal implementation: 
sl@0: 	// I am a character device about which little is known
sl@0: 	st->st_mode = S_IFCHR;
sl@0: 	st->st_blksize=0;
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Complete (TRequestStatus& aStatus, TInt aResult)
sl@0: 	{
sl@0: 	TRequestStatus* sp=&aStatus;
sl@0: 	User::RequestComplete(sp,aResult);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Write (TDes8& /*aBuf*/, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation for /dev/null
sl@0: 	// we will claim to have written all of the data
sl@0: 	Complete(aStatus,KErrNone);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::WriteCancel() {}
sl@0: 
sl@0: TInt CFileDescBase::WriteCompletion (TDes8& /*aBuf*/, TInt aStatus)
sl@0: 	{
sl@0: 	return aStatus;
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Sync (TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation for /dev/null
sl@0: 	Complete(aStatus,KErrNone);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::SyncCancel() {}
sl@0: 
sl@0: void CFileDescBase::Ioctl(int /*aCmd*/, void* /*aParam*/, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation for /dev/null and other synchronous devices
sl@0: 	Complete(aStatus,KErrNone);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::IoctlCancel() 
sl@0: 	{
sl@0: 	return;	// suitable for all synchronous ioctls
sl@0: 	}
sl@0: 
sl@0: TInt CFileDescBase::IoctlCompletion(int aCmd, void* aParam, TInt aStatus)
sl@0: 	{
sl@0: 	TInt ret=aStatus;
sl@0: 	if (ret!=KErrNone)
sl@0: 		return ret;
sl@0: 	int *param=REINTERPRET_CAST(int*,aParam);
sl@0: 	switch (aCmd)
sl@0: 		{
sl@0: 	case E32IONREAD:
sl@0: 		*param=0;	// claim that no data is available
sl@0: 		break;
sl@0: 	case E32IOSELECT:
sl@0: 		*param=(*param)&(E32SELECT_READ|E32SELECT_WRITE);	// but don't block
sl@0: 		break;
sl@0: 	default:
sl@0: 		ret=KErrNotSupported;
sl@0: 		break;
sl@0: 		}
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: // A CFileDescBase factory function, for socket objects
sl@0: 
sl@0: CFileDescBase* CFileDescBase::Socket(RSocketServ& aSs, int family, int style, int protocol, TInt& err)
sl@0: 	{
sl@0: 	// connect to the Socket Server if necessary
sl@0: 	if (aSs.Handle()==0)
sl@0: 		{
sl@0: 		err=aSs.Connect(TUint(-1));	// allow arbitrary number of requests
sl@0: 		if (err)
sl@0: 			return 0;
sl@0: 		}
sl@0: 	CSocketDesc* s= new CSocketDesc;
sl@0: 	if (s==0)
sl@0: 		{
sl@0: 		err=KErrNoMemory;
sl@0: 		return 0;
sl@0: 		}
sl@0: 	err=s->Socket(aSs,family,style,protocol);
sl@0: 	if (err)
sl@0: 		{
sl@0: 		delete s;
sl@0: 		return 0;
sl@0: 		}
sl@0: 	return s;
sl@0: 	}
sl@0: 
sl@0: // minimal implementation of sockets, useful for all non-socket descriptors
sl@0: 
sl@0: void CFileDescBase::RecvFrom(TDes8& /*aDesc*/, TSockAddr& /*from*/, int /*flags*/, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation
sl@0: 	Complete(aStatus,ENOTSOCK);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::RecvFromCancel () {}
sl@0: 
sl@0: TInt CFileDescBase::RecvFromCompletion(TInt& /*aLength*/, TInt aStatus)
sl@0: 	{
sl@0: 	return aStatus;
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::SendTo(TDes8& /*aDesc*/, TSockAddr& /*to*/, int /*flags*/, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation
sl@0: 	Complete(aStatus,ENOTSOCK);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::SendToCancel () {}
sl@0: 
sl@0: TInt CFileDescBase::SendToCompletion(TDes8& /*aDesc*/, TInt aStatus)
sl@0: 	{
sl@0: 	return aStatus;
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Shutdown(TUint /*aHow*/,TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation
sl@0: 	Complete(aStatus,ENOTSOCK);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::ShutdownCancel () {}
sl@0: 
sl@0: TInt CFileDescBase::Bind(TSockAddr& /*anAddr*/)
sl@0: 	{
sl@0: 	return ENOTSOCK;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDescBase::Listen(TUint /*qSize*/)
sl@0: 	{
sl@0: 	return ENOTSOCK;
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Accept(CSocketDesc*& /*aNewSocket*/, TRequestStatus& aStatus, RSocketServ& /*aSs*/)
sl@0: 	{
sl@0: 	// minimal implementation
sl@0: 	Complete(aStatus,ENOTSOCK);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::AcceptCancel () {}
sl@0: 
sl@0: void CFileDescBase::Connect(TSockAddr& /*anAddr*/,TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	// minimal implementation
sl@0: 	Complete(aStatus,ENOTSOCK);
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::ConnectCancel () {}
sl@0: 
sl@0: TInt CFileDescBase::SockName(int /*anEnd*/, TSockAddr& /*anAddr*/)
sl@0: 	{
sl@0: 	return ENOTSOCK;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDescBase::GetSockOpt(TUint /*anOptionName*/,TUint /*anOptionLevel*/,TDes8& /*anOption*/)
sl@0: 	{
sl@0: 	return ENOTSOCK;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDescBase::SetSockOpt(TUint /*anOptionName*/,TUint /*anOptionLevel*/,TDesC8& /*anOption*/)
sl@0: 	{
sl@0: 	return ENOTSOCK;
sl@0: 	}
sl@0: 
sl@0: // Queue handling
sl@0: 
sl@0: void CFileDescBase::AddLast(CPosixRequest& aRequest, IOQueues aQueue)
sl@0: 	{
sl@0: 	TPosixRequestQueue& queue = iQueues[aQueue];
sl@0: 	queue.AddLast(aRequest);
sl@0: 	if (queue.IsFirst(&aRequest))
sl@0: 		aRequest.StartAsynch();	// queue was empty, so start straight away
sl@0: 	}
sl@0: 
sl@0: void CFileDescBase::Remove(CPosixRequest& aRequest, IOQueues aQueue)
sl@0: 	{
sl@0: 	TPosixRequestQueue& queue = iQueues[aQueue];
sl@0: 	TBool wasFirst = queue.IsFirst(&aRequest);
sl@0: 	queue.Remove(aRequest);
sl@0: 	if (wasFirst)
sl@0: 		{
sl@0: 		if (!queue.IsEmpty())
sl@0: 			queue.First()->StartAsynch();	// start the next outstanding request
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: 
sl@0: // Generic (non-virtual) handling for Close
sl@0: 
sl@0: TInt CFileDescBase::Close()
sl@0: 	{ 
sl@0: 	TInt err=KErrNone;
sl@0: 	if (--iDupCount < 0)
sl@0: 		{
sl@0: 		err=FinalClose();
sl@0: 		delete this;
sl@0: 		}
sl@0: 	return err;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDescBase::FinalClose()
sl@0: 	{
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: // Simple implementation of File handling
sl@0: 
sl@0: static int MapMode(int aMode, TUint& fMode)
sl@0: 	{
sl@0: 	// EPOC32 doesn't support Write-Only
sl@0: 	
sl@0: 	if (aMode & (O_WRONLY|O_RDWR))
sl@0: 		{
sl@0: 		fMode = EFileWrite;
sl@0: 		fMode |= (aMode & O_EXCL) ? EFileShareExclusive : EFileShareAny;	
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		fMode = EFileRead;
sl@0: 		fMode |= (aMode & O_EXCL) ? EFileShareExclusive : EFileShareReadersOnly;	
sl@0: 		}
sl@0: 
sl@0: 	fMode |= (aMode & O_TEXT) ? EFileStreamText : EFileStream;
sl@0: 
sl@0: 	return aMode & (O_CREAT|O_TRUNC|O_APPEND|O_EXCL);
sl@0: 	}
sl@0: 
sl@0: CFileDesc::CFileDesc()
sl@0: 	:CFileDescBase(), iSize(EBufferSize), iExt(-1)
sl@0: 	{}
sl@0: 
sl@0: CFileDesc::~CFileDesc()
sl@0: 	{
sl@0: 	iFile.Close();
sl@0: 	delete [] iBuffer;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::FinalClose()
sl@0: 	{
sl@0: 	return DoSync();
sl@0: 	}
sl@0: 	
sl@0: TInt CFileDesc::Open(RFs& aSession, const TDesC& aName, int mode, int /*perms*/)
sl@0: 	{
sl@0: 	TInt err;
sl@0: 	TUint fMode;
sl@0: 
sl@0: 	iDrive=(TInt16)TDriveUnit(aName);
sl@0: 
sl@0: 	// Create  = make new file, can return KErrAlreadyExists
sl@0: 	// Open    = open an existing file, can return KErrPathNotFound or KErrNotFound
sl@0: 	// Replace = open a new file, zapping the existing one if necessary
sl@0: 
sl@0: 	int mapped=MapMode(mode, fMode);
sl@0: 	switch (mapped)
sl@0: 		{
sl@0: 		case O_CREAT|O_EXCL:
sl@0: 			err = iFile.Create(aSession, aName, fMode);
sl@0: 			break;
sl@0: 		case O_CREAT|O_TRUNC:
sl@0: 			err = iFile.Replace(aSession, aName, fMode);
sl@0: 			break;
sl@0: 		case O_TRUNC:
sl@0: 			err = iFile.Open(aSession, aName, fMode);
sl@0: 			if (err == KErrPathNotFound)
sl@0: 			    {
sl@0: 			    // missing directories etc, so fail directly
sl@0: 			    }
sl@0: 			else
sl@0: 			    {
sl@0: 			    iFile.Close();
sl@0: 			    err = iFile.Replace(aSession, aName, fMode);
sl@0: 			    }
sl@0: 			break;
sl@0: 
sl@0: 		// Everything else is assumed to mean open existing file,
sl@0: 		// If the file isn't there, O_CREAT implies that we should make it
sl@0: 		default:
sl@0: 			err = iFile.Open(aSession, aName, fMode);
sl@0: 			if (err == KErrNotFound && (mapped & O_CREAT))
sl@0: 			    err = iFile.Create(aSession, aName, fMode);
sl@0: 			if (err == KErrNone && (mapped & O_APPEND))
sl@0: 			    {
sl@0: 				iPos = Ext();
sl@0: 				if (iPos < 0)
sl@0: 					err = iPos;
sl@0: 			    }
sl@0: 			break;
sl@0: 		}
sl@0: 	if ((mode & O_BUFFERED) == 0)
sl@0: 		iSize = 0;
sl@0: 	return err;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::LSeek (int& offset, int whence)
sl@0: 	{
sl@0: 
sl@0: 	TInt pos=offset;
sl@0: 	TInt ext=Ext();
sl@0: 	if (ext < 0)
sl@0: 		return ext;
sl@0: 
sl@0: 	switch (whence)
sl@0: 		{
sl@0: 	case SEEK_SET:
sl@0: 		break;
sl@0: 	case SEEK_CUR:
sl@0: 		pos += Pos();
sl@0: 		break;
sl@0: 	case SEEK_END:
sl@0: 		pos += ext;
sl@0: 		break;
sl@0: 	default:
sl@0: 		return KErrArgument;
sl@0: 		}
sl@0: 	TInt ret = KErrNone;
sl@0: 	if (pos < 0)
sl@0: 		{
sl@0: 		pos = 0;
sl@0: 		ret = KErrEof;
sl@0: 		}
sl@0: 	else if (pos > ext)
sl@0: 		{
sl@0: 		pos = ext;
sl@0: 		ret = KErrEof;
sl@0: 		}
sl@0: 
sl@0: 	switch (iState)
sl@0: 		{
sl@0: 	case EAlloc:
sl@0: 		iPos = pos;
sl@0: 		break;
sl@0: 	case EReading:
sl@0: 		{
sl@0: 		TInt lag = iPos - pos;
sl@0: 		if (lag >= 0 && lag <= (iEnd - iBuffer))
sl@0: 			iPtr = iEnd - lag;
sl@0: 		else
sl@0: 			{
sl@0: 			iPtr = iEnd;
sl@0: 			iPos = pos;
sl@0: 			}
sl@0: 		}
sl@0: 		break;
sl@0: 	case EWriting:
sl@0: 		if (pos != Pos())
sl@0: 			{
sl@0: 			ret = Flush();
sl@0: 			if (ret == KErrNone)
sl@0: 				iPos = pos;
sl@0: 			}
sl@0: 		break;
sl@0: 		}
sl@0: 	offset = pos;
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: void CFileDesc::MapStat(struct stat& st, const TTime& aModTime, TUint& aAttr)
sl@0:     {
sl@0:     st.st_mode = (aAttr&KEntryAttDir) ? S_IFDIR:S_IFREG;
sl@0:     if ((aAttr&KEntryAttReadOnly)==0)
sl@0: 	st.st_mode |= S_IWUSR;
sl@0:     st.st_nlink = 1;
sl@0:     st.st_mtime = as_time_t(aModTime);
sl@0:     st.st_blksize=512;
sl@0:     }
sl@0: 
sl@0: TInt CFileDesc::FStat (struct stat* st)
sl@0: 	{
sl@0: 	TInt err;
sl@0: 	TUint att;
sl@0: 	TTime modtime;
sl@0: 	
sl@0: 	err = iFile.Att(att);
sl@0: 	if (!err)
sl@0: 	    {
sl@0: 	    err = iFile.Modified(modtime);
sl@0: 	    if (!err)
sl@0: 		{
sl@0: 		err=Ext();
sl@0: 		if (err >= 0)
sl@0: 		    {
sl@0: 		    st->st_size = err;
sl@0: 		    st->st_dev = st->st_rdev = iDrive;
sl@0: 		    MapStat(*st, modtime, att);
sl@0: 		    return 0;
sl@0: 		    }
sl@0: 		}
sl@0: 	    }
sl@0: 	return err;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::Alloc()
sl@0: 	{
sl@0: 	if (iSize)
sl@0: 		{
sl@0: 		iBuffer = new TUint8[iSize];
sl@0: 		if (iBuffer == 0)
sl@0: 			return KErrNoMemory;
sl@0: 		}
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::FileRead(TUint8* aPtr,TInt aLength)
sl@0: 	{
sl@0: 	TPtr8 ptr(aPtr,aLength);
sl@0: 	TInt r=iFile.Read(iPos,ptr);
sl@0: 	if (r == KErrNone)
sl@0: 		{
sl@0: 		r = ptr.Length();
sl@0: 		iPos += r;
sl@0: 		if (r < aLength)
sl@0: 			iExt = iPos;
sl@0: 		}
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::FileWrite(TUint8* aPtr,TInt aLength)
sl@0: 	{
sl@0: 	TPtrC8 ptr(aPtr,aLength);
sl@0: 	TInt r = iFile.Write(iPos,ptr);
sl@0: 	if (r == KErrNone)
sl@0: 		{
sl@0: 		iPos += aLength;
sl@0: 		if (iPos > iExt && iExt >= 0)
sl@0: 			iExt = iPos;
sl@0: 		}
sl@0: 	return r;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::Flush()
sl@0: 	{
sl@0: 	if (iPtr > iBuffer)
sl@0: 		{
sl@0: 		TInt r = FileWrite(iBuffer, iPtr-iBuffer);
sl@0: 		if (r < 0)
sl@0: 			return r;
sl@0: 		iPtr = iBuffer;
sl@0: 		}
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::DoRead (TDes8& aDesc)
sl@0: 	{
sl@0: 	if (iState != EReading)
sl@0: 		{
sl@0: 		TInt ret = (iState == EAlloc) ? Alloc() : Flush();
sl@0: 		if (ret != KErrNone)
sl@0: 			return ret;
sl@0: 		iState = EReading;
sl@0: 		iPtr = iEnd = iBuffer;
sl@0: 		}
sl@0: 
sl@0: 	TUint8* p = (TUint8*) aDesc.Ptr();
sl@0: 	TInt max = aDesc.MaxLength();
sl@0: 	TInt avail = iEnd - iPtr;
sl@0: 	TInt len = Min(max, avail);
sl@0: 	if (len > 0)
sl@0: 		{
sl@0: 		p = Mem::Copy(p, iPtr, len);
sl@0: 		iPtr += len;
sl@0: 		max -= len;
sl@0: 		}
sl@0: 	if (max >= iSize)
sl@0: 		{
sl@0: 		TInt ret = FileRead(p, max);
sl@0: 		if (ret < 0)
sl@0: 			return ret;
sl@0: 		p += ret;
sl@0: 		}
sl@0: 	else if (max > 0)
sl@0: 		{
sl@0: 		TInt ret = FileRead(iBuffer, Min(max + EReadAhead, iSize));
sl@0: 		if (ret < 0)
sl@0: 			return ret;
sl@0: 		len = Min(max, ret);
sl@0: 		p = Mem::Copy(p, iBuffer, len);
sl@0: 		iPtr = iBuffer + len;
sl@0: 		iEnd = iBuffer + ret;
sl@0: 		}
sl@0: 	aDesc.SetLength(p-aDesc.Ptr());
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void CFileDesc::Read (TDes8& aDesc, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	Complete(aStatus,DoRead(aDesc));
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::DoWrite (TDes8& aDesc)
sl@0: 	{
sl@0: 	if (iState != EWriting)
sl@0: 		{
sl@0: 		if (iState == EAlloc)
sl@0: 			{
sl@0: 			TInt ret = Alloc();
sl@0: 			if (ret != KErrNone)
sl@0: 				return ret;
sl@0: 			}
sl@0: 		else
sl@0: 			iPos -= iEnd - iPtr;
sl@0: 
sl@0: 		iState = EWriting;
sl@0: 		iPtr = iBuffer;
sl@0: 		iEnd = iBuffer + iSize;
sl@0: 		}
sl@0: 
sl@0: 	TUint8* p = (TUint8*) aDesc.Ptr();
sl@0: 	TInt max = aDesc.Length();
sl@0: 	TInt avail = iEnd - iPtr;
sl@0: 	TInt len = Min(max, avail);
sl@0: 	if (len > 0)
sl@0: 		{
sl@0: 		iPtr = Mem::Copy(iPtr, p, len);
sl@0: 		p += len;
sl@0: 		max -= len;
sl@0: 		}
sl@0: 	if (max == 0)
sl@0: 		return KErrNone;
sl@0: 	TInt r=Flush();
sl@0: 	if (r < 0)
sl@0: 		return r;
sl@0: 	if (max >= iSize)
sl@0: 		return FileWrite(p, max);
sl@0: 	iPtr = Mem::Copy(iPtr, p, max);
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: void CFileDesc::Write(TDes8& aDesc, TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	Complete(aStatus,DoWrite(aDesc));
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::DoSync()
sl@0: 	{
sl@0: 	if (iState == EWriting)
sl@0: 		{
sl@0: 		TInt ret = Flush();
sl@0: 		if (ret < 0)
sl@0: 			return ret;
sl@0: 		}
sl@0: 	return iFile.Flush();
sl@0: 	}
sl@0: 
sl@0: void CFileDesc::Sync(TRequestStatus& aStatus)
sl@0: 	{
sl@0: 	Complete(aStatus,DoSync());
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::Pos()
sl@0: 	{
sl@0: 	TInt pos = iPos;
sl@0: 	if (iState == EReading)
sl@0: 		pos -= (iEnd - iPtr);
sl@0: 	else if (iState == EWriting)
sl@0: 		pos += (iPtr - iBuffer);
sl@0: 	return pos;
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::Ext()
sl@0: 	{
sl@0: 	if (iExt < 0)
sl@0: 		{
sl@0: 		TInt r = iFile.Size(iExt);
sl@0: 		if (r < 0)
sl@0: 			return r;
sl@0: 		}
sl@0: 	return Max(iExt, Pos());
sl@0: 	}
sl@0: 
sl@0: TInt CFileDesc::IoctlCompletion(int aCmd, void* aParam, TInt aStatus)
sl@0: 	{
sl@0: 	TInt ret=aStatus;
sl@0: 	if (ret!=KErrNone)
sl@0: 		return ret;
sl@0: 	// some useful sums about the current state of the file
sl@0: 	TInt curoff = Pos();
sl@0: 	TInt size = Ext();
sl@0: 	if (size < 0)
sl@0: 		ret = size;
sl@0: 	int *param=REINTERPRET_CAST(int*,aParam);
sl@0: 	switch (aCmd)
sl@0: 		{
sl@0: 	case E32IONREAD:
sl@0: 		if (ret==KErrNone)
sl@0: 			*param=(size-curoff);
sl@0: 		break;
sl@0: 	case E32IOSELECT:
sl@0: 		{
sl@0: 		int mask=E32SELECT_WRITE;
sl@0: 		if ((size-curoff)>0)
sl@0: 			mask |= E32SELECT_READ;
sl@0: 		*param=(*param)&mask;	// but don't block
sl@0: 		}
sl@0: 		break;
sl@0: 	default:
sl@0: 		ret=KErrNotSupported;
sl@0: 		break;
sl@0: 		}
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: // Extra support for temporary files
sl@0: 
sl@0: TInt CTempFileDesc::Open(RFs& aSession, const TDesC& aPath)
sl@0: 	{
sl@0: 	iSession=aSession;
sl@0: 	iDrive=(TInt16)TDriveUnit(aPath);
sl@0: 	TInt err=iFile.Temp(aSession, aPath, iName, EFileShareAny);
sl@0: 	return err;
sl@0: 	}
sl@0: 
sl@0: TInt CTempFileDesc::FinalClose()
sl@0: 	{
sl@0: 	iFile.Close();
sl@0: 	TInt err=iSession.Delete(iName);
sl@0: 	return err;
sl@0: 	}