//+-------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) 1992, Microsoft Corporation.
//
// File: expst.cxx
//
// Contents: CExposedStream code
//
//--------------------------------------------------------------------------
#include <exphead.cxx>
#include <pbstream.hxx>
#include <expst.hxx>
#include <lock.hxx>
#include <seekptr.hxx>
#include <logfile.hxx>
// Maximum stream size supported by exposed streams
// This is MAX_ULONG with one subtracted so that
// the seek pointer has a spot to sit even at the
// end of the stream
#define CBMAXSTREAM 0xfffffffeUL
// Maximum seek pointer value
#define CBMAXSEEK (CBMAXSTREAM+1)
//+--------------------------------------------------------------
//
// Member: CExposedStream::CExposedStream, public
//
// Synopsis: Empty object constructor
//
//---------------------------------------------------------------
CExposedStream::CExposedStream(void)
{
olDebugOut((DEB_ITRACE, "In CExposedStream::CExposedStream()\n"));
_cReferences = 0;
_ulAccessLockBase = 0;
_psp = NULL;
_pst = NULL;
olDebugOut((DEB_ITRACE, "Out CExposedStream::CExposedStream\n"));
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::InitWithSeekPtr, public
//
// Synopsis: Base constructor
//
// Arguments: [pst] - Public stream
// [pdfb] - DocFile basis
// [ppc] - Context
// [fOwnContext] - Whether this object owns the context
// [psp] - Seek pointer or NULL for new seek pointer
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
SCODE CExposedStream::Init(CPubStream *pst,
CSeekPointer *psp)
{
SCODE sc;
olDebugOut((DEB_ITRACE, "In CExposedStream::Init("
"%p, %p)\n", pst, psp));
if (psp == NULL)
olMem(_psp = new CSeekPointer(0));
else
_psp = psp;
_pst = pst;
_cReferences = 1;
_sig = CEXPOSEDSTREAM_SIG;
olDebugOut((DEB_ITRACE, "Out CExposedStream::InitWithSeekPtr\n"));
return S_OK;
EH_Err:
return sc;
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::~CExposedStream, public
//
// Synopsis: Destructor
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
inline
CExposedStream::~CExposedStream(void)
{
olDebugOut((DEB_ITRACE, "In CExposedStream::~CExposedStream\n"));
olAssert(_cReferences == 0);
_sig = CEXPOSEDSTREAM_SIGDEL;
if (_pst)
_pst->CPubStream::vRelease();
if (_psp)
_psp->CSeekPointer::vRelease();
olDebugOut((DEB_ITRACE, "Out CExposedStream::~CExposedStream\n"));
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Read, public
//
// Synopsis: Read from a stream
//
// Arguments: [pb] - Buffer
// [cb] - Count of bytes to read
// [pcbRead] - Return number of bytes read
//
// Returns: Appropriate status code
//
// Modifies: [pcbRead]
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::Read(VOID HUGEP *pb, ULONG cb, ULONG *pcbRead)
{
SCODE sc;
ULONG cbRead = 0;
olLog(("%p::In CExposedStream::Read(%p, %lu, %p)\n",
this, pb, cb, pcbRead));
olDebugOut((DEB_ITRACE, "In CExposedStream::Read(%p, %lu, %p)\n",
pb, cb, pcbRead));
TRY
{
if (pcbRead)
{
olChkTo(EH_BadPtr, ValidateOutBuffer(pcbRead, sizeof(ULONG)));
}
olChk(ValidateHugeOutBuffer(pb, cb));
olChk(Validate());
sc = _pst->ReadAt(_psp->GetPos(), pb, cb,
(ULONG STACKBASED *)&cbRead);
olAssert(CBMAXSEEK-_psp->GetPos() >= cbRead);
_psp->SetPos(_psp->GetPos()+cbRead);
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Read => %lu\n", cbRead));
EH_Err:
if (pcbRead)
{
*pcbRead = cbRead;
olLog(("%p::Out CExposedStream::Read(). *pcbRead == %lu, ret = %lx\n",
this, *pcbRead, sc));
}
else
{
olLog(("%p::Out CExposedStream::Read(). ret == %lx\n", this, sc));
}
EH_BadPtr:
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Write, public
//
// Synopsis: Write to a stream
//
// Arguments: [pb] - Buffer
// [cb] - Count of bytes to write
// [pcbWritten] - Return of bytes written
//
// Returns: Appropriate status code
//
// Modifies: [pcbWritten]
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::Write(
VOID const HUGEP *pb,
ULONG cb,
ULONG *pcbWritten)
{
SCODE sc;
ULONG cbWritten = 0;
olLog(("%p::In CExposedStream::Write(%p, %lu, %p)\n",
this, pb, cb, pcbWritten));
olDebugOut((DEB_ITRACE, "In CExposedStream::Write(%p, %lu, %p)\n",
pb, cb, pcbWritten));
TRY
{
if (pcbWritten)
{
olChkTo(EH_BadPtr, ValidateOutBuffer(pcbWritten, sizeof(ULONG)));
}
olChk(ValidateHugeBuffer(pb, cb));
olChk(Validate());
sc = _pst->WriteAt(_psp->GetPos(), pb, cb,
(ULONG STACKBASED *)&cbWritten);
olAssert(CBMAXSEEK-_psp->GetPos() >= cbWritten);
_psp->SetPos(_psp->GetPos()+cbWritten);
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Write => %lu\n",
cbWritten));
EH_Err:
if (pcbWritten)
{
*pcbWritten = cbWritten;
olLog(("%p::Out CExposedStream::Write(). *pcbWritten == %lu, ret = %lx\n",
this, *pcbWritten, sc));
}
else
{
olLog(("%p::Out CExposedStream::Write(). ret == %lx\n",this, sc));
}
EH_BadPtr:
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Seek, public
//
// Synopsis: Seek to a point in a stream
//
// Arguments: [dlibMove] - Offset to move by
// [dwOrigin] - SEEK_SET, SEEK_CUR, SEEK_END
// [plibNewPosition] - Return of new offset
//
// Returns: Appropriate status code
//
// Modifies: [plibNewPosition]
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::Seek(LARGE_INTEGER dlibMove,
DWORD dwOrigin,
ULARGE_INTEGER *plibNewPosition)
{
SCODE sc;
LONG lMove;
ULARGE_INTEGER ulPos;
olLog(("%p::In CExposedStream::Seek(%ld, %lu, %p)\n",
this, LIGetLow(dlibMove), dwOrigin, plibNewPosition));
olDebugOut((DEB_ITRACE, "In CExposedStream::Seek(%ld, %lu, %p)\n",
LIGetLow(dlibMove), dwOrigin, plibNewPosition));
TRY
{
if (plibNewPosition)
{
olChk(ValidateOutBuffer(plibNewPosition, sizeof(ULARGE_INTEGER)));
ULISet32(*plibNewPosition, 0);
}
if (dwOrigin != STREAM_SEEK_SET && dwOrigin != STREAM_SEEK_CUR &&
dwOrigin != STREAM_SEEK_END)
olErr(EH_Err, STG_E_INVALIDFUNCTION);
// Truncate dlibMove to 32 bits
if (dwOrigin == STREAM_SEEK_SET)
{
// Make sure we don't seek too far
if (LIGetHigh(dlibMove) != 0)
LISet32(dlibMove, (LONG)0xffffffff);
}
else
{
// High dword must be zero for positive values or -1 for
// negative values
// Additionally, for negative values, the low dword can't
// exceed -0x80000000 because the 32nd bit is the sign
// bit
if (LIGetHigh(dlibMove) > 0 ||
(LIGetHigh(dlibMove) == 0 &&
LIGetLow(dlibMove) >= 0x80000000))
LISet32(dlibMove, 0x7fffffff);
else if (LIGetHigh(dlibMove) < -1 ||
(LIGetHigh(dlibMove) == -1 &&
LIGetLow(dlibMove) <= 0x7fffffff))
LISet32(dlibMove, (LONG)0x80000000);
}
lMove = (LONG)LIGetLow(dlibMove);
olChk(Validate());
ULISet32(ulPos, _psp->GetPos());
switch(dwOrigin)
{
case STREAM_SEEK_SET:
ULISetLow(ulPos, (ULONG)lMove);
break;
case STREAM_SEEK_END:
ULONG cbSize;
olChk(_pst->GetSize(&cbSize));
if (lMove < 0)
{
if ((ULONG)(-lMove) > cbSize)
olErr(EH_Err, STG_E_INVALIDFUNCTION);
}
else if ((ULONG)lMove > CBMAXSEEK-cbSize)
lMove = (LONG)(CBMAXSEEK-cbSize);
ULISetLow(ulPos, cbSize+lMove);
break;
case STREAM_SEEK_CUR:
if (lMove < 0)
{
if ((ULONG)(-lMove) > _psp->GetPos())
olErr(EH_Err, STG_E_INVALIDFUNCTION);
}
else if ((ULONG)lMove > CBMAXSEEK-_psp->GetPos())
lMove = (LONG)(CBMAXSEEK-_psp->GetPos());
ULISetLow(ulPos, _psp->GetPos()+lMove);
break;
}
_psp->SetPos(ULIGetLow(ulPos));
if (plibNewPosition)
*plibNewPosition = ulPos;
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Seek => %lu\n",
ULIGetLow(ulPos)));
EH_Err:
olLog(("%p::Out CExposedStream::Seek(). ulPos == %lu, ret == %lx\n",
this, ULIGetLow(ulPos), sc));
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::SetSize, public
//
// Synopsis: Sets the size of a stream
//
// Arguments: [ulNewSize] - New size
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::SetSize(ULARGE_INTEGER ulNewSize)
{
SCODE sc;
olLog(("%p::In CExposedStream::SetSize(%lu)\n",
this, ULIGetLow(ulNewSize)));
olDebugOut((DEB_ITRACE, "In CExposedStream::SetSize(%lu)\n",
ULIGetLow(ulNewSize)));
TRY
{
if (ULIGetHigh(ulNewSize) != 0)
olErr(EH_Err, STG_E_INVALIDFUNCTION);
olChk(Validate());
olChk(_pst->SetSize(ULIGetLow(ulNewSize)));
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::SetSize\n"));
EH_Err:
olLog(("%p::Out CExposedStream::SetSize(). ret == %lx\n", this, sc));
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::CopyTo, public
//
// Synopsis: Copies information from one stream to another
//
// Arguments: [pstm] - Destination
// [cb] - Number of bytes to copy
// [pcbRead] - Return number of bytes read
// [pcbWritten] - Return number of bytes written
//
// Returns: Appropriate status code
//
// Modifies: [pcbRead]
// [pcbWritten]
//
// Notes: We do our best to handle overlap correctly. This allows
// CopyTo to be used to insert and remove space within a
// stream.
//
// In the error case, we make no gurantees as to the
// validity of pcbRead, pcbWritten, or either stream's
// seek position.
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::CopyTo(IStream *pstm,
ULARGE_INTEGER cb,
ULARGE_INTEGER *pcbRead,
ULARGE_INTEGER *pcbWritten)
{
SCODE sc;
ULONG ulCopySize;
ULONG ulSrcSize;
ULONG ulSrcOrig;
ULARGE_INTEGER uliDestOrig;
LARGE_INTEGER liDestPos;
BYTE *pb = NULL;
BOOL fOverlap;
ULONG ulBytesCopied = 0;
olLog(("%p::In CExposedStream::CopyTo(%p, %lu, %p, %p)\n",
this, pstm, ULIGetLow(cb), pcbRead, pcbWritten));
olDebugOut((DEB_TRACE, "In CExposedStream::CopyTo("
"%p, %lu, %p, %p)\n", pstm, ULIGetLow(cb),
pcbRead, pcbWritten));
TRY
{
if (pcbRead)
{
olChk(ValidateOutBuffer(pcbRead, sizeof(ULARGE_INTEGER)));
ULISet32(*pcbRead, 0);
}
if (pcbWritten)
{
olChk(ValidateOutBuffer(pcbWritten, sizeof(ULARGE_INTEGER)));
ULISet32(*pcbWritten, 0);
}
olChk(ValidateInterface(pstm, IID_IStream));
olChk(Validate());
// Bound the size of the copy
// 1. The maximum we can copy is 0xffffffff
if (ULIGetHigh(cb) == 0)
ulCopySize = ULIGetLow(cb);
else
ulCopySize = 0xffffffff;
// 2. We can only copy what's available in the source stream
sc = _pst->GetSize(&ulSrcSize);
olChk(sc);
ulSrcOrig = _psp->GetPos();
if (ulSrcSize < ulSrcOrig)
{
// Nothing in source to copy
ulCopySize = 0;
}
else if ((ulSrcSize - ulSrcOrig) < ulCopySize)
{
// Shrink ulCopySize to fit bytes in source
ulCopySize = ulSrcSize - ulSrcOrig;
}
// 3. We can only copy what will fit in the destination
LISet32(liDestPos, 0);
olHChk(pstm->Seek(liDestPos, STREAM_SEEK_CUR, &uliDestOrig));
olAssert(ULIGetHigh(uliDestOrig) == 0);
if (ulCopySize > CBMAXSEEK - ULIGetLow(uliDestOrig))
ulCopySize = CBMAXSEEK - ULIGetLow(uliDestOrig);
// We are allowed to fail here with out-of-memory
olMem(pb = new BYTE[STREAMBUFFERSIZE]);
// Since we have no reliable way to determine if the source and
// destination represent the same stream, we assume they
// do and always handle overlap.
fOverlap = (ULIGetLow(uliDestOrig) > ulSrcOrig &&
ULIGetLow(uliDestOrig) < ulSrcOrig + ulCopySize);
ULONG ulSrcCopyOffset;
ULONG ulDstCopyOffset;
if (fOverlap)
{
// We're going to copy back to front, so determine the
// stream end positions
ulSrcCopyOffset = ulSrcOrig + ulCopySize;
// uliDestOrig is the destination starting offset
ulDstCopyOffset = ULIGetLow(uliDestOrig) + ulCopySize;
}
while (ulCopySize > 0)
{
// We can only copy up to STREAMBUFFERSIZE bytes at a time
ULONG cbPart = min(ulCopySize, STREAMBUFFERSIZE);
if (fOverlap)
{
// We're copying back to front so we need to seek to
// set up the streams correctly
ulSrcCopyOffset -= cbPart;
ulDstCopyOffset -= cbPart;
// Set source stream position
_psp->SetPos(ulSrcCopyOffset);
// Set destination stream position
LISet32(liDestPos, ulDstCopyOffset);
olHChk(pstm->Seek(liDestPos, STREAM_SEEK_SET, NULL));
}
{
ULONG ulRead;
olHChk(Read(pb, cbPart, &ulRead));
if (cbPart != ulRead)
{
// There was no error, but we were unable to read cbPart
// bytes. Something's wrong (the underlying ILockBytes?)
// but we can't control it; just return an error.
olErr(EH_Err, STG_E_READFAULT);
}
}
{
ULONG ulWritten;
olHChk(pstm->Write(pb, cbPart, &ulWritten));
if (cbPart != ulWritten)
{
// There was no error, but we were unable to write
// ulWritten bytes. We can't trust the pstm
// implementation, so all we can do here is return
// an error.
olErr(EH_Err, STG_E_WRITEFAULT);
}
}
olAssert(ulCopySize >= cbPart);
ulCopySize -= cbPart;
ulBytesCopied += cbPart;
}
if (fOverlap)
{
// Set the seek pointers to the correct location
_psp->SetPos(ulSrcOrig + ulBytesCopied);
LISet32(liDestPos, ULIGetLow(uliDestOrig) + ulBytesCopied);
olHChk(pstm->Seek(liDestPos, STREAM_SEEK_SET, NULL));
}
if (pcbRead)
ULISet32(*pcbRead, ulBytesCopied);
if (pcbWritten)
ULISet32(*pcbWritten, ulBytesCopied);
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::CopyTo => %lu, %lu\n",
pcbRead ? ULIGetLow(*pcbRead) : 0,
pcbWritten ? ULIGetLow(*pcbWritten) : 0));
// Fall through
EH_Err:
delete [] pb;
olLog(("%p::Out CExposedStream::CopyTo(). "
"cbRead == %lu, cbWritten == %lu, ret == %lx\n",
this, pcbRead ? ULIGetLow(*pcbRead) : 0,
pcbWritten ? ULIGetLow(*pcbWritten) : 0, sc));
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Release, public
//
// Synopsis: Releases a stream
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP_(ULONG) CExposedStream::Release(void)
{
LONG lRet;
olLog(("%p::In CExposedStream::Release()\n", this));
olDebugOut((DEB_ITRACE, "In CExposedStream::Release()\n"));
TRY
{
if (FAILED(Validate()))
return 0;
olAssert(_cReferences > 0);
lRet = AtomicDec(&_cReferences);
if (lRet == 0)
{
delete this;
}
else if (lRet < 0)
lRet = 0;
}
CATCH(CException, e)
{
UNREFERENCED_PARM(e);
lRet = 0;
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Release\n"));
olLog(("%p::Out CExposedStream::Release(). ret == %lu\n", this, lRet));
FreeLogFile();
return lRet;
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Stat, public
//
// Synopsis: Fills in a buffer of information about this object
//
// Arguments: [pstatstg] - Buffer
//
// Returns: Appropriate status code
//
// Modifies: [pstatstg]
//
//---------------------------------------------------------------
TSTDMETHODIMP CExposedStream::Stat(STATSTGW *pstatstg, DWORD grfStatFlag)
{
SCODE sc, scSem = STG_E_INUSE;
olLog(("%p::In CExposedStream::Stat(%p)\n", this, pstatstg));
olDebugOut((DEB_ITRACE, "In CExposedStream::Stat(%p)\n",
pstatstg));
TRY
{
olChkTo(EH_RetSc, ValidateOutBuffer(pstatstg, sizeof(STATSTGW)));
olChk(VerifyStatFlag(grfStatFlag));
olChk(Validate());
olChk(_pst->Stat(pstatstg, grfStatFlag));
pstatstg->type = STGTY_STREAM;
pstatstg->grfLocksSupported = 0;
pstatstg->reserved = 0;
pstatstg->ctime.dwLowDateTime = pstatstg->ctime.dwHighDateTime = 0;
pstatstg->mtime.dwLowDateTime = pstatstg->mtime.dwHighDateTime = 0;
pstatstg->atime.dwLowDateTime = pstatstg->atime.dwHighDateTime = 0;
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Stat\n"));
EH_Err:
if (FAILED(sc))
memset(pstatstg, 0, sizeof(STATSTGW));
EH_RetSc:
olLog(("%p::Out CExposedStream::Stat(). ret == %lx\n",
this, sc));
return sc;
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Clone, public
//
// Synopsis: Clones a stream
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::Clone(IStream **ppstm)
{
CExposedStream *pst;
CSeekPointer *psp;
SCODE sc;
olLog(("%p::In CExposedStream::Clone(%p)\n", this, ppstm));
olDebugOut((DEB_ITRACE, "In CExposedStream::Clone(%p)\n", ppstm));
TRY
{
olChk(ValidateOutPtrBuffer(ppstm));
*ppstm = NULL;
olChk(Validate());
olChk(_pst->CheckReverted());
olMem(psp = new CSeekPointer(_psp->GetPos()));
olMemTo(EH_psp, pst = new CExposedStream);
olChkTo(EH_pst, pst->Init(_pst, psp));
_pst->vAddRef();
*ppstm = pst;
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Clone => %p\n", *ppstm));
return ResultFromScode(sc);
EH_pst:
delete pst;
EH_psp:
psp->vRelease();
EH_Err:
olLog(("%p::Out CExposedStream::Clone(). *ppstm == %p, ret == %lx\n",
this, *ppstm, sc));
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::AddRef, public
//
// Synopsis: Increments the ref count
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP_(ULONG) CExposedStream::AddRef(void)
{
ULONG ulRet;
olLog(("%p::In CExposedStream::AddRef()\n", this));
olDebugOut((DEB_ITRACE, "In CExposedStream::AddRef()\n"));
TRY
{
if (FAILED(Validate()))
return 0;
AtomicInc(&_cReferences);
ulRet = _cReferences;
}
CATCH(CException, e)
{
UNREFERENCED_PARM(e);
ulRet = 0;
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::AddRef\n"));
olLog(("%p::Out CExposedStream::AddRef(). ret == %lu\n", this, ulRet));
return ulRet;
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::LockRegion, public
//
// Synopsis: Nonfunctional
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::LockRegion(ULARGE_INTEGER libOffset,
ULARGE_INTEGER cb,
DWORD dwLockType)
{
olDebugOut((DEB_ITRACE, "In CExposedStream::LockRegion("
"%lu, %lu\n", ULIGetLow(cb), dwLockType));
olDebugOut((DEB_ITRACE, "Out CExposedStream::LockRegion\n"));
olLog(("%p::INVALID CALL TO CExposedStream::LockRegion()\n"));
return ResultFromScode(STG_E_INVALIDFUNCTION);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::UnlockRegion, public
//
// Synopsis: Nonfunctional
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::UnlockRegion(ULARGE_INTEGER libOffset,
ULARGE_INTEGER cb,
DWORD dwLockType)
{
olDebugOut((DEB_ITRACE, "In CExposedStream::UnlockRegion(%lu, %lu)\n",
ULIGetLow(cb), dwLockType));
olDebugOut((DEB_ITRACE, "Out CExposedStream::UnlockRegion\n"));
olLog(("%p::INVALID CALL TO CExposedStream::UnlockRegion()\n"));
return ResultFromScode(STG_E_INVALIDFUNCTION);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Commit, public
//
// Synopsis: No-op in current implementation
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::Commit(DWORD grfCommitFlags)
{
SCODE sc, scSem = STG_E_INUSE;
olDebugOut((DEB_ITRACE, "In CExposedStream::Commit(%lu)\n",
grfCommitFlags));
olLog(("%p::In CExposedStream::Commit(%lx)\n", this, grfCommitFlags));
TRY
{
olChk(Validate());
olChk(_pst->Commit(grfCommitFlags));
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::Commit\n"));
EH_Err:
olLog(("%p::Out CExposedStream::Commit(). ret == %lx", this, sc));
return ResultFromScode(sc);
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::Revert, public
//
// Synopsis: No-op in current implementation
//
// Returns: Appropriate status code
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::Revert(void)
{
olDebugOut((DEB_ITRACE, "In CExposedStream::Revert()\n"));
olDebugOut((DEB_ITRACE, "Out CExposedStream::Revert\n"));
olLog(("%p::In CExposedStream::Revert()\n", this));
olLog(("%p::Out CExposedStream::Revert(). ret == %lx", this, S_OK));
return NOERROR;
}
//+--------------------------------------------------------------
//
// Member: CExposedStream::QueryInterface, public
//
// Synopsis: Returns an object for the requested interface
//
// Arguments: [iid] - Interface ID
// [ppvObj] - Object return
//
// Returns: Appropriate status code
//
// Modifies: [ppvObj]
//
//---------------------------------------------------------------
STDMETHODIMP CExposedStream::QueryInterface(REFIID iid, void **ppvObj)
{
SCODE sc;
olLog(("%p::In CExposedStream::QueryInterface(?, %p)\n",
this, ppvObj));
olDebugOut((DEB_ITRACE, "In CExposedStream::QueryInterface(?, %p)\n",
ppvObj));
TRY
{
olChk(ValidateOutPtrBuffer(ppvObj));
*ppvObj = NULL;
olChk(ValidateIid(iid));
olChk(Validate());
olChk(_pst->CheckReverted());
if (IsEqualIID(iid, IID_IStream) || IsEqualIID(iid, IID_IUnknown))
{
olChk(AddRef());
*ppvObj = this;
}
else
olErr(EH_Err, E_NOINTERFACE);
sc = S_OK;
}
CATCH(CException, e)
{
sc = e.GetErrorCode();
}
END_CATCH
olDebugOut((DEB_ITRACE, "Out CExposedStream::QueryInterface => %p\n",
ppvObj));
EH_Err:
olLog(("%p::Out CExposedStream::QueryInterface(). *ppvObj == %p, ret == %lx\n",
this, *ppvObj, sc));
return ResultFromScode(sc);
}