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windows-nt/Source/XPSP1/NT/com/ole32/stg/msf/sstream.cxx
CryptoAlgo Inc b3cac27891 Add source files
2020-09-26 16:20:57 +08:00

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//+-------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1992 - 1992.
//
// File: sstream.cxx
//
// Contents: Stream operations for Mstream project
//
// Classes: None. (defined in sstream.hxx)
//
// History: 18-Jul-91 PhilipLa Created.
// 24-Apr-92 AlexT Small object support
//
//--------------------------------------------------------------------
#include "msfhead.cxx"
#pragma hdrstop
#include <dirfunc.hxx>
#include <sstream.hxx>
#include <dl.hxx>
#include <tstream.hxx>
#include <time.h>
#include <mread.hxx>
#define DEB_STREAM (DEB_ITRACE | 0x00020000)
//+--------------------------------------------------------------
//
// Member: CDirectStream::CDirectStream, public
//
// Synopsis: Empty object constructor
//
// Arguments: [dl] - LUID
//
// History: 25-Aug-92 DrewB Created
//
//---------------------------------------------------------------
CDirectStream::CDirectStream(DFLUID dl)
: PSStream(dl)
{
_pdlHolder = NULL;
_cReferences = 0;
#ifdef SECURE_STREAMS
_ulSize = 0;
_ulHighWater = 0;
#endif
_sig = CDIRECTSTREAM_SIG;
}
//+-------------------------------------------------------------------------
//
// Method: CDirectStream::~CDirectStream, public
//
// Synopsis: CDirectStream destructor
//
// History: 18-Jul-91 PhilipLa Created.
//
// Notes:
//
//--------------------------------------------------------------------------
CDirectStream::~CDirectStream()
{
msfAssert(_cReferences == 0);
_sig = CDIRECTSTREAM_SIGDEL;
#ifdef SECURE_STREAMS
if (_ulSize > _ulHighWater)
{
ClearSects(_ulHighWater, _ulSize);
}
#endif
}
//+--------------------------------------------------------------
//
// Member: CDirectStream::InitSystem, public
//
// Synopsis: Initializes special system streams like the ministream
//
// Arguments: [pms] - Multistream
// [sid] - SID
// [cbSize] - size
//
// History: 25-Aug-92 DrewB Created
//
//---------------------------------------------------------------
void CDirectStream::InitSystem(CMStream *pms,
SID sid,
#ifdef LARGE_STREAMS
ULONGLONG cbSize)
#else
ULONG cbSize)
#endif
{
_stmh.Init(pms, sid);
_ulSize = _ulOldSize = cbSize;
_stmc.Init(pms, sid, this);
#ifdef SECURE_STREAMS
#ifndef SECURE_BUFFER
//If SECURE_BUFFER is defined, we've already zeroed this in the
// multistream.
memset(s_bufSecure, SECURECHAR, MINISTREAMSIZE);
#endif
_ulHighWater = cbSize;
#endif
AddRef();
}
//+-------------------------------------------------------------------------
//
// Method: CDirectStream::Init, public
//
// Synopsis: CDirectStream constructor
//
// Arguments: [pstgh] - Parent
// [pdfn] - Name of entry
// [fCreate] - Create or get
//
// Returns: Appropriate status code
//
// History: 18-Jul-91 PhilipLa Created.
// 02-Jan-92 PhilipLa Converted to use handle.
// 25-Aug-92 DrewB Converted to use StgHandle
//
//--------------------------------------------------------------------------
SCODE CDirectStream::Init(
CStgHandle *pstgh,
CDfName const *pdfn,
BOOL const fCreate)
{
SCODE sc;
if (fCreate)
sc = pstgh->CreateEntry(pdfn, STGTY_STREAM, &_stmh);
else
sc = pstgh->GetEntry(pdfn, STGTY_STREAM, &_stmh);
if (SUCCEEDED(sc))
{
sc = _stmh.GetSize(&_ulSize);
_ulOldSize = _ulSize;
#ifdef SECURE_STREAMS
_ulHighWater = (fCreate) ? 0 : _ulSize;
#endif
#if DBG == 1
if (SUCCEEDED(sc))
{
//Make sure that the stream is sane.
SCODE sc2;
CFat *pfat;
ULONG cbSector;
ULONG cSect;
ULONG cSectReal;
SECT sectStart;
if (_ulSize < MINISTREAMSIZE)
{
cbSector = MINISECTORSIZE;
pfat = _stmh.GetMS()->GetMiniFat();
}
else
{
cbSector = _stmh.GetMS()->GetSectorSize();
pfat = _stmh.GetMS()->GetFat();
}
cSect = (ULONG)((_ulSize + cbSector - 1) / cbSector);
sc2 = _stmh.GetMS()->GetDir()->GetStart(
_stmh.GetSid(),
&sectStart);
if (SUCCEEDED(sc2))
{
sc2 = pfat->GetLength(sectStart, &cSectReal);
if (SUCCEEDED(sc2))
{
msfAssert((cSect == cSectReal) &&
aMsg("Chain length incorrect at init."));
}
}
}
#endif
if (SUCCEEDED(sc))
AddRef();
_stmc.Init(_stmh.GetMS(), _stmh.GetSid(), this);
}
return sc;
}
//+-------------------------------------------------------------------------
//
// Member: CDirectStream::ReadAt, public
//
// Synposis: Reads binary data from a linear single stream
//
// Arguments: [ulOffset] -- Position to be read from
//
// [pBuffer] -- Pointer to the area into which the data
// will be read.
// [ulCount] -- Indicates the number of bytes to be read
// [pulRetval] -- Area into which return value will be stored
//
// Returns: Error Code of parent MStream call
//
// Algorithm: Calculate start and end sectors and offsets, then
// pass call up to parent MStream.
//
// History: 18-Jul-91 PhilipLa Created.
// 16-Aug-91 PhilipLa Converted to use multi-sect read
// 23-Aug-91 PhilipLa Brought into compliance with protocol
// 11-Sep-91 PhilipLa Moved most functionality up
// to MStream level.
// 24-Apr-92 AlexT Move everything to MStream::MRead
// 09-Jun-92 PhilipLa Added fUnconverted support
//
// Notes: [pBuffer] may be unsafe memory
//
//---------------------------------------------------------------------------
SCODE CDirectStream::ReadAt(
#ifdef LARGE_STREAMS
ULONGLONG ulOffset,
#else
ULONG ulOffset,
#endif
VOID HUGEP *pBuffer,
ULONG ulCount,
ULONG STACKBASED *pulRetval)
{
msfDebugOut((DEB_ITRACE,"In CDirectStream::ReadAt(%lu,%p,%lu)\n",
ulOffset,pBuffer,ulCount));
SCODE sc = S_OK;
CMStream *pms = _stmh.GetMS();
*pulRetval = 0;
if (NULL == pms)
return STG_E_UNKNOWN;
// Check for offset beyond stream size and zero count
if ((ulOffset >= _ulSize) || (0 == ulCount))
{
return S_OK;
}
if (ulOffset + ulCount > _ulSize)
{
msfDebugOut((DEB_ITRACE,"Truncating Read: ulOffset = %lu, ulCount = %lu, _ulSize = %lu\n",
ulOffset,ulCount,_ulSize));
ulCount = (ULONG)(_ulSize - ulOffset);
}
#ifdef DELAYCONVERT
if (pms->IsUnconverted())
{
ULARGE_INTEGER ulTmp;
ULISet32(ulTmp, ulOffset);
return DfGetScode(pms->GetILB()->ReadAt(ulTmp, pBuffer, ulCount,
pulRetval));
}
#else
msfAssert(!pms->IsUnconverted());
#endif
// Stream is stored in ministream if size < MINISTREAMSIZE
// and this is not a scratch stream.
#ifdef SECURE_STREAMS
if (ulOffset + ulCount > _ulHighWater)
{
if (ulOffset > _ulHighWater)
{
//Zero the whole buffer and return.
memset(pBuffer, SECURECHAR, ulCount);
*pulRetval = ulCount;
return S_OK;
}
//Need to read into part of the buffer, then zero fill the
// rest.
if (FAILED(sc = ReadAt(ulOffset,
pBuffer,
_ulHighWater - ulOffset,
pulRetval)) ||
(*pulRetval != _ulHighWater - ulOffset))
{
return sc;
}
memset((BYTE *)pBuffer + *pulRetval,
SECURECHAR,
ulCount - (_ulHighWater - ulOffset));
*pulRetval = ulCount;
return S_OK;
}
#endif
SID sid = _stmh.GetSid();
CFat *pfat = pms->GetFat();
USHORT cbSector = pms->GetSectorSize();
USHORT uShift = pms->GetSectorShift();
USHORT uMask = pms->GetSectorMask();
if ((_ulSize < MINISTREAMSIZE) &&
(!pms->IsScratch()) &&
(sid != SIDMINISTREAM))
{
msfAssert(sid <= MAXREGSID);
// This stream is stored in the ministream
cbSector = MINISECTORSIZE;
uShift = MINISECTORSHIFT;
uMask = cbSector - 1;
pfat = pms->GetMiniFat();
}
SECT start = (SECT)(ulOffset >> uShift);
OFFSET oStart = (OFFSET)(ulOffset & uMask);
SECT end = (SECT)((ulOffset + ulCount - 1) >> uShift);
OFFSET oEnd = (OFFSET)((ulOffset + ulCount - 1) & uMask);
ULONG total = 0;
ULONG cSect = end - start + 1;
USHORT offset;
offset = oStart;
while (TRUE)
{
ULONG cSeg;
SSegment segtab[CSEG + 1];
msfChk(_stmc.Contig(start,
FALSE,
(SSegment STACKBASED *) segtab,
cSect,
&cSeg));
msfAssert(cSeg <= CSEG);
USHORT oend = cbSector - 1;
for (USHORT iseg = 0; iseg < cSeg;)
{
msfDebugOut((DEB_ITRACE,"Segment: (%lu,%lu)\n",segtab[iseg].sectStart,segtab[iseg].cSect));
SECT sectStart = segtab[iseg].sectStart;
ULONG i = segtab[iseg].cSect;
if (i > cSect)
i = cSect;
cSect -= i;
start += i;
iseg++;
if (cSect == 0)
oend = oEnd;
ULONG ulSize = ((i - 1) << uShift) - offset + oend + 1;
ULONG bytecount;
SCODE sc;
if (pms->GetMiniFat() == pfat)
{
sc = pms->GetMiniStream()->CDirectStream::ReadAt(
(sectStart << uShift) + offset,
pBuffer, ulSize,
(ULONG STACKBASED *)&bytecount);
}
else
{
ULARGE_INTEGER ulOffset;
#ifdef LARGE_DOCFILE
ulOffset.QuadPart = ConvertSectOffset(sectStart,offset,uShift);
#else
ULISet32(ulOffset, ConvertSectOffset(sectStart,offset,uShift));
#endif
sc = DfGetScode(pms->GetILB()->ReadAt(ulOffset,
(BYTE *)pBuffer, ulSize,
&bytecount));
}
total += bytecount;
if ((0 == cSect) || (FAILED(sc)))
{
*pulRetval = total;
msfDebugOut((DEB_ITRACE,
"Leaving CDirectStream::ReadAt()=>%lu, ret is %lu\n",
sc,*pulRetval));
return sc;
}
pBuffer = (BYTE HUGEP *)pBuffer + bytecount;
offset = 0;
}
}
msfDebugOut((DEB_ERROR,"In CDirectStream::ReadAt - reached end of function\n"));
Err:
return sc;
}
//+-------------------------------------------------------------------------
//
// Member: CDirectStream::Write, public
//
// Synposis: Writes binary data from a linear single stream
//
// Effects: Modifies _ulSeekPos. May cause modification in parent
// MStream.
//
// Arguments: [pBuffer] -- Pointer to the area from which the data
// will be written.
// [ulCount] -- Indicates the number of bytes to be written
// [pulRetval] -- Pointer to area in which number of bytes
// will be returned
//
// Returns: Error code of MStream call.
//
// Algorithm: Calculate sector and offset for beginning and end of
// write, then pass call up to MStream.
//
//
// History: 18-Jul-91 PhilipLa Created.
// 16-Aug-91 PhilipLa Converted to use multi-sect write
// 23-Aug-91 PhilipLa Brought into compliance with protocol
// 11-Sep-91 PhilipLa Moved most functionality up
// to MStream level.
//
// Notes: [pBuffer] may be unsafe memory
//
//---------------------------------------------------------------------------
SCODE CDirectStream::WriteAt(
#ifdef LARGE_STREAMS
ULONGLONG ulOffset,
#else
ULONG ulOffset,
#endif
VOID const HUGEP *pBuffer,
ULONG ulCount,
ULONG STACKBASED *pulRetval)
{
msfDebugOut((DEB_ITRACE,"In CDirectStream::WriteAt(%lu,%p,%lu)\n",ulOffset,pBuffer,ulCount));
*pulRetval = 0;
if (0 == ulCount)
return S_OK;
SCODE sc;
CMStream *pms;
pms = _stmh.GetMS();
if (NULL == pms)
return STG_E_UNKNOWN;
if (ulOffset + ulCount > _ulSize)
{
if (_ulSize > MINISTREAMSIZE)
{
}
else
{
msfChk(SetSize(ulOffset + ulCount));
}
}
// This should be an inline call to MWrite
#ifdef SECURE_STREAMS
if (ulOffset > _ulHighWater)
{
ClearSects(_ulHighWater, ulOffset);
}
#endif
msfChk(pms->MWrite(
_stmh.GetSid(),
(_ulSize < MINISTREAMSIZE),
ulOffset,
pBuffer,
ulCount,
&_stmc,
pulRetval));
msfDebugOut((DEB_ITRACE,"Leaving CDirectStream::WriteAt()==>%lu, ret is %lu\n",sc,*pulRetval));
Err:
#ifdef SECURE_STREAMS
if ((*pulRetval > 0 ) &&
(ulOffset + *pulRetval > _ulHighWater))
{
_ulHighWater = ulOffset + *pulRetval;
}
#endif
if (*pulRetval > 0 &&
ulOffset + *pulRetval > _ulSize)
{
SCODE scSet;
_ulSize = ulOffset + *pulRetval;
scSet = pms->GetDir()->SetSize(_stmh.GetSid(), _ulSize);
if (SUCCEEDED(sc) && FAILED(scSet))
{
sc = scSet;
}
}
#ifdef SECURE_STREAMS
msfAssert(_ulHighWater <= _ulSize);
#endif
return sc;
}
//+-------------------------------------------------------------------------
//
// Member: CDirectStream::SetSize, public
//
// Synposis: Set the size of a linear stream
//
// Effects: Modifies _ulSize. May cause change in parent MStream.
//
// Arguments: [ulNewSize] -- New size for stream
//
// Returns: Error code returned by MStream call.
//
// Algorithm: Pass call up to parent.
//
// History: 29-Jul-91 PhilipLa Created.
// 14-May-92 AlexT Add small object support
//
// Notes: When changing the size of a stream, we need to be concerned
// with the cases where each stream is either zero length,
// stored in the ministream, or stored in a regular stream. The following
// grid shows the actions that we must perform in each case:
//
// New Sector Count (Cn)
//
// 0 S L
// O ------------------------------------------------
// l | same size | allocate Cn | allocate Cn
// d 0 | (fast out) | small sectors | large sectors
// ------------------------------------------------
// S | small | Co > Cn: | cbCopy = cbOld
// e S | setchain(Cn) | small | large allocate Cn
// c | | setchain(Cn)| copy bytes
// t | | Cn > Co: | small setchain(0)
// o | | extend small | copy data
// r ------------------------------------------------
// L | large | cbCopy = cbNew| Co > Cn:
// C | setchain(Cn) | small | large setchain(Cn)
// o | | allocate Cn | Cn > Co:
// u | | copy bytes | extend large
// n | | large |
// t | | setchain(0) |
// | | copy data |
// (Co) ------------------------------------------------
//
// where S indicates small sectors, L indicates large sectors, and Cx
// represents count of sectors. For example, the middle box represents
// doing a setsize on a stream which is currently stored in a small
// stream in Co small sectors and which will end up in a large stream
// with Cn sectors.
//
//---------------------------------------------------------------------------
#ifdef LARGE_STREAMS
SCODE CDirectStream::SetSize(ULONGLONG cbNewSize)
#else
SCODE CDirectStream::SetSize(ULONG cbNewSize)
#endif
{
msfDebugOut((DEB_ITRACE,"In CDirectStream::SetSize(%lu)\n",cbNewSize));
SCODE sc = S_OK;
BYTE *pBuf = NULL;
SID sid = _stmh.GetSid();
CMStream *pms = _stmh.GetMS();
msfAssert(sid <= MAXREGSID);
if (NULL == pms)
return STG_E_UNKNOWN;
CDirectory *pdir = pms->GetDir();
if (_ulSize == cbNewSize)
{
return S_OK;
}
#ifdef SECURE_STREAMS
msfAssert(_ulHighWater <= _ulSize);
#endif
USHORT cbpsOld = pms->GetSectorSize();
// Count of Bytes Per Sector
USHORT cbpsNew = cbpsOld;
CFat *pfatOld = pms->GetFat();
CFat *pfatNew = pfatOld;
if ((!pms->IsScratch()) && (SIDMINISTREAM != sid))
{
// This is not a scratch DocFile, nor is this stream the ministream;
// check if this stream is and/or will be stored in the ministream.
if (cbNewSize < MINISTREAMSIZE)
{
cbpsNew = MINISECTORSIZE;
pfatNew = pms->GetMiniFat();
}
if (_ulSize < MINISTREAMSIZE)
{
cbpsOld = MINISECTORSIZE;
pfatOld = pms->GetMiniFat();
}
}
ULONG csectOld = (ULONG)((_ulSize + cbpsOld - 1) / cbpsOld);
ULONG csectNew = (ULONG)((cbNewSize + cbpsNew - 1) / cbpsNew);
msfAssert(sid <= MAXREGSID);
SECT sectstart, sectOldStart;
msfChk(pdir->GetStart(sid, &sectstart));
//Save start sector so we can free it later.
sectOldStart = sectstart;
msfDebugOut((DEB_ITRACE,"pdbOld size is %lu\n\tSid is %lu\n\tStart is %lu\n",
_ulSize,sid,sectstart));
msfDebugOut((DEB_ITRACE,"CMStream::SetSize() needs %lu %u byte sectors\n",
csectNew, cbpsNew));
msfDebugOut((DEB_ITRACE,"SetSize() currently has %lu %u byte sectors\n",
csectOld, cbpsOld));
ULONG cbCopy;
cbCopy = 0;
if (cbpsOld != cbpsNew)
{
// Sector sizes are different, so we'll copy the data
msfAssert((cbNewSize > _ulSize ? _ulSize : cbNewSize) < 0x10000);
cbCopy = (ULONG)(cbNewSize > _ulSize ? _ulSize : cbNewSize);
}
if (cbCopy > 0)
{
msfDebugOut((DEB_ITRACE,"Copying between fat and minifat\n"));
GetSafeBuffer(cbCopy, cbCopy, &pBuf, &cbCopy);
msfAssert((pBuf != NULL) && aMsg("Couldn't get scratch buffer"));
ULONG ulRetVal;
sc = ReadAt(0, pBuf, cbCopy, (ULONG STACKBASED *)&ulRetVal);
#ifdef SECURE_STREAMS
//Part of the buffer may have gunk in it, so clear it out.
if (_ulHighWater < cbCopy)
{
memset(pBuf + _ulHighWater, SECURECHAR, cbCopy - _ulHighWater);
}
#endif
if ((FAILED(sc)) ||
((ulRetVal != cbCopy) ? (sc = STG_E_UNKNOWN) : 0))
{
msfErr(Err, sc);
}
#ifdef SECURE_STREAMS
ClearSects(_ulHighWater, _ulSize);
_ulHighWater = cbNewSize;
#endif
//The cache is no longer valid, so empty it.
_stmc.Empty();
msfChk(_stmc.Allocate(pfatNew, csectNew, &sectstart));
}
else
{
SECT dummy;
if ((csectOld > csectNew))
{
#ifdef SECURE_STREAMS
ClearSects(_ulHighWater, _ulSize);
_ulHighWater = cbNewSize;
#endif
if (0 == csectNew)
{
//Note: We need to set the start sect in the directory
// first in case the SetChainLength call fails part way
// through, which would leave this directory entry pointing
// to a FREESECT.
SECT sectOldStart = sectstart;
msfChk(pdir->SetStart(sid, ENDOFCHAIN));
sectstart = ENDOFCHAIN;
msfChk(pfatOld->SetChainLength(sectOldStart, 0));
}
else
{
msfChk(pfatOld->SetChainLength(sectstart, csectNew));
}
//If this turns out to be a common case, we can
// sometimes keep the cache valid here.
_stmc.Empty();
}
else if (0 == csectOld)
{
msfChk(_stmc.Allocate(pfatNew, csectNew, &sectstart));
}
else if (csectNew > csectOld)
{
ULONG start = csectNew - 1;
msfChk(_stmc.GetESect(start, &dummy));
}
}
// Resize the ministream, if necessary
if (((MINISECTORSIZE == cbpsOld) && (csectOld > 0)) ||
((MINISECTORSIZE == cbpsNew) && (csectNew > 0)))
{
msfChk(pms->SetMiniSize());
}
msfChk(pms->SetSize());
//If we fail on either of these operations and cbCopy != 0,
// we will have data loss. Ick.
// Optimization - we only set the start sector if it has changed.
if (sectstart != sectOldStart)
{
msfChk(pdir->SetStart(sid, sectstart));
}
//If we fail here, we're in big trouble.
msfChk(pdir->SetSize(sid, cbNewSize));
_ulSize = cbNewSize;
#ifdef SECURE_STREAMS
if (_ulHighWater > _ulSize)
{
_ulHighWater = _ulSize;
}
#endif
if (cbCopy > 0)
{
// now copy the data
ULONG ulRetVal;
msfAssert(cbCopy <= _ulSize);
msfChk(WriteAt(0, pBuf, cbCopy, (ULONG STACKBASED *)&ulRetVal));
if (ulRetVal != cbCopy)
{
msfErr(Err, STG_E_UNKNOWN);
}
msfChk(pfatOld->SetChainLength(sectOldStart, 0));
msfChk(pms->SetMiniSize());
msfChk(pms->SetSize());
}
#ifdef SECURE
if (((csectNew > csectOld) || (cbCopy > 0)) &&
((cbNewSize & (cbpsNew - 1)) != 0))
{
SECT sectLast;
msfChk(_stmc.GetSect(csectNew - 1, &sectLast));
msfVerify(SUCCEEDED(pms->SecureSect(
sectLast,
cbNewSize,
(cbNewSize < MINISTREAMSIZE) && (sid != SIDMINISTREAM))));
}
#endif //SECURE
#ifdef SECURE_STREAMS
msfAssert(_ulHighWater <= _ulSize);
#endif
Err:
#ifdef SECURE_STREAMS
if (_ulHighWater > _ulSize)
{
_ulHighWater = _ulSize;
}
#endif
// Optimization - avoid calling FreeBuffer (which will end up calling
// out to CompObj.DLL) when pBuf is NULL (common case).
if (pBuf != NULL)
FreeBuffer(pBuf);
if (FAILED(sc))
_stmc.Empty();
return sc;
}
//+-------------------------------------------------------------------------
//
// Method: CDirectStream::BeginCommitFromChild, public
//
// Synopsis: Begin a commit from a child stream
//
// Arguments: [ulSize] -- Size of child stream
// [pDelta] -- Pointer to delta list
// [pstChild] - Child
//
// Returns: S_OK if call completed successfully.
//
// Algorithm: *Finish This*
//
// History: 22-Jan-92 PhilipLa Created.
//
// Notes:
//
//--------------------------------------------------------------------------
SCODE CDirectStream::BeginCommitFromChild(
#ifdef LARGE_STREAMS
ULONGLONG ulSize,
#else
ULONG ulSize,
#endif
CDeltaList *pDelta,
CTransactedStream *pstChild)
{
msfDebugOut((DEB_ITRACE,"In CDirectStream::BeginCommitFromChild:%p("
"%lu, %p, %p)\n", this, ulSize, pDelta, pstChild));
// msfDebugOut((DEB_ITRACE,"MultiStrean is %p\nStream name is: %ws\n",_stmh.GetMS(),((_stmh.GetMS()))->GetName(_stmh.GetSid())));
SCODE sc = S_OK;
ULONG temp;
BYTE *pb = NULL;
_pdlHolder = P_TO_BP(CBasedDeltaListPtr, pDelta);
// Copy-on-write will back out these changes if we fail
#ifdef USE_NOSCRATCH
//For no-scratch mode, we commit very differently than we do regularly,
// unless this commit is somehow involving the minifat.
if ((pDelta->IsNoScratch()) &&
(ulSize >= MINISTREAMSIZE) &&
((_ulSize >= MINISTREAMSIZE) || (_ulSize == 0)) &&
(!pDelta->IsEmpty()))
{
USHORT cbSector = pDelta->GetDataSectorSize();
SECT sectEnd = (SECT)((ulSize + cbSector - 1) / cbSector);
SECT sectLast = ENDOFCHAIN;
//We update our size and directory first so the stream cache
// code knows which fat to get to.
_ulOldSize = _ulSize;
_ulSize = ulSize;
msfChk(_stmh.GetMS()->GetDir()->SetSize(_stmh.GetSid(), ulSize));
if (_ulOldSize > _ulSize)
{
//We need to truncate the chain.
SECT sectStart;
_stmh.GetMS()->GetDir()->GetStart(_stmh.GetSid(), &sectStart);
_stmh.GetMS()->GetFat()->SetChainLength(sectStart, sectEnd);
_stmc.Empty();
}
for (ULONG i = 0; i < sectEnd; i++)
{
SECT sectDirty;
SECT sectOld;
SECT sectNext;
//For each sector, chain the old sector with the
//existing new one.
msfChk(pDelta->GetMap(i, DL_READ, &sectDirty));
if (sectDirty != ENDOFCHAIN)
{
if (i > 0)
{
CFat *pfat = _stmh.GetMS()->GetFat();
msfChk(_stmc.GetSect(i - 1, &sectLast));
msfAssert(sectLast != ENDOFCHAIN);
msfChk(pfat->GetNext(sectLast, &sectOld));
msfChk(pfat->SetNext(sectLast, sectDirty));
if (sectOld != ENDOFCHAIN)
{
msfChk(pfat->GetNext(sectOld, &sectNext));
msfChk(pfat->SetNext(sectOld, FREESECT));
}
else
{
sectNext = ENDOFCHAIN;
}
msfChk(pfat->SetNext(sectDirty, sectNext));
msfChk(_stmc.EmptyRegion(i, i));
}
else
{
CFat *pfat = _stmh.GetMS()->GetFat();
CDirectory *pdir = _stmh.GetMS()->GetDir();
sectNext = ENDOFCHAIN;
msfChk(pdir->GetStart(_stmh.GetSid(), &sectLast));
if (sectLast != ENDOFCHAIN)
{
msfChk(pfat->GetNext(sectLast, &sectNext));
msfChk(pfat->SetNext(sectLast, FREESECT));
}
msfChk(pfat->SetNext(sectDirty, sectNext));
msfChk(pdir->SetStart(_stmh.GetSid(), sectDirty));
msfChk(_stmc.EmptyRegion(i, i));
}
}
}
#ifdef SECURE_STREAMS
_ulHighWater = _ulSize;
#endif
#if DBG == 1
//Make sure that the stream is sane.
#ifdef LARGE_STREAMS
ULONGLONG ulDirSize;
#else
ULONG ulDirSize;
#endif
ULONG cSect;
ULONG cSectReal;
SECT sectStart;
_stmh.GetMS()->GetDir()->GetSize(_stmh.GetSid(), &ulDirSize);
cSect = (ULONG)((ulDirSize + cbSector - 1) / cbSector);
_stmh.GetMS()->GetDir()->GetStart(_stmh.GetSid(), &sectStart);
_stmh.GetMS()->GetFat()->GetLength(sectStart, &cSectReal);
msfAssert((cSect == cSectReal) &&
aMsg("Chain length incorrect after commit."));
#endif
}
else
{
#endif //USE_NOSCRATCH
// Note: It's critical that we do this SetSize first (since we
// use our scratch buffer below and SetSize can potentially also
// use the scratch buffer.
msfChk(SetSize(ulSize));
_ulOldSize = _ulSize;
msfAssert(pDelta != NULL);
if (!pDelta->IsEmpty())
{
USHORT cbSector = pDelta->GetDataSectorSize();
USHORT uSectorShift = pDelta->GetDataSectorShift();
ULONG cbActualSize = 0;
ULONG cbMaxSects = 15;
GetSafeBuffer(cbSector, cbSector * cbMaxSects, &pb, &cbActualSize);
BYTE *pbcurrent = pb;
msfAssert((pb != NULL) && aMsg("Couldn't get scratch buffer"));
cbMaxSects = cbActualSize / cbSector;
OFFSET oEnd;
oEnd = (OFFSET)((_ulSize - 1) % cbSector) + 1;
SECT sectEnd;
sectEnd = (SECT)((_ulSize + cbSector - 1) / cbSector);
ULONG ulOffset;
ILockBytes *pilbDirty;
SECT sectBeginRead = ENDOFCHAIN; //the first sector to read
SECT sectBeginWrite = ENDOFCHAIN; //the offset of the first place to write
SECT sectDirty = ENDOFCHAIN; //the sector at this offset
USHORT uReadCount = 0;
ULARGE_INTEGER ulTmp;
pilbDirty = pDelta->GetDataILB();
for (ulOffset = 0; ulOffset < sectEnd; ulOffset++)
{
if (sectDirty == ENDOFCHAIN)
{
sectBeginWrite = ulOffset;
}
msfChk(pDelta->GetMap(ulOffset, DL_READ, &sectDirty));
// Read will happen when we have determined there is something to read
// and either
// we have reached an ENDOFCHAIN
// we have reached a non-adjacent sector
// or we have reached the maximun amount that can be read
if ( (uReadCount) &&
( (sectDirty == ENDOFCHAIN) ||
(sectDirty != sectBeginRead + uReadCount) ||
(ulOffset - sectBeginWrite == cbMaxSects) ))
{
msfDebugOut((DEB_ITRACE,"Reading %u sectors from sect %lu\n",
uReadCount,
sectBeginRead));
#ifdef LARGE_DOCFILE
ulTmp.QuadPart = ConvertSectOffset(sectBeginRead, 0,
uSectorShift);
#else
ULISet32(ulTmp, ConvertSectOffset(sectBeginRead, 0,
uSectorShift));
#endif
msfHChk(pilbDirty->ReadAt(
ulTmp,
pbcurrent,
cbSector * uReadCount,
(ULONG STACKBASED *)&temp));
pbcurrent += cbSector * uReadCount;
sectBeginRead = sectDirty;
//reset the ReadCount now that we are done reading
if (sectDirty == ENDOFCHAIN)
uReadCount = 0;
else
uReadCount = 1;
}
// increment the read count
else if (sectDirty != ENDOFCHAIN)
{
if (sectBeginRead == ENDOFCHAIN)
{
sectBeginRead = sectDirty;
uReadCount=1;
}
else if (sectDirty == sectBeginRead + uReadCount)
{
uReadCount++;
}
}
// Write occurs when we have something to write
// and we have reached an ENDOFCHAIN
// or the write buffer is full
if (((sectDirty == ENDOFCHAIN) &&
(sectBeginWrite != ulOffset) ) ||
(ulOffset - sectBeginWrite == cbMaxSects) )
{
msfDebugOut((DEB_ITRACE,"Writing %u sectors from sect %lu\n",
ulOffset - sectBeginWrite,
sectBeginWrite));
msfChk(WriteAt(sectBeginWrite * cbSector,
pb,
cbSector * (ulOffset - sectBeginWrite),
(ULONG STACKBASED *)&temp));
pbcurrent = pb;
sectBeginWrite = ulOffset;
}
}
// After loop, do last read and write
if (uReadCount)
{
#ifdef LARGE_DOCFILE
ulTmp.QuadPart = ConvertSectOffset(sectBeginRead, 0, uSectorShift);
#else
ULISet32(ulTmp, ConvertSectOffset(sectBeginRead, 0,
uSectorShift));
#endif
msfDebugOut((DEB_ITRACE,"END::Reading %u sectors from sect %lu\n",
uReadCount,
sectBeginRead));
msfHChk(pilbDirty->ReadAt(
ulTmp,
pbcurrent,
cbSector * uReadCount,
(ULONG STACKBASED *)&temp));
msfDebugOut((DEB_ITRACE,"END::Writing %u sectors from sect %lu\n",
ulOffset - sectBeginWrite,
sectBeginWrite));
msfChk(WriteAt(sectBeginWrite * cbSector,
pb,
// all sectors except the last one
(cbSector * ((ulOffset-1) - sectBeginWrite)
// last sector fragment
+ oEnd ),
(ULONG STACKBASED *)&temp));
}
}
#ifdef USE_NOSCRATCH
}
#endif
msfDebugOut((DEB_ITRACE,"Out CDirectStream::BeginCommitFromChild()\n"));
Err:
#ifdef SECURE_STREAMS
msfAssert(_ulHighWater <= _ulSize);
#endif
FreeBuffer(pb);
return sc;
}
//+-------------------------------------------------------------------------
//
// Method: CDirectStream::EndCommitFromChild
//
// Synopsis: End a commit sequence from a child stream
//
// Arguments: [df] -- Indicates whether to commit or abort
// [pstChild] - Child
//
// Returns: S_OK if call completed successfully.
//
// Algorithm: *Finish This*
//
// History: 22-Jan-92 PhilipLa Created.
//
// Notes:
//
//--------------------------------------------------------------------------
void CDirectStream::EndCommitFromChild(DFLAGS df,
CTransactedStream *pstChild)
{
msfDebugOut((DEB_ITRACE,"In CDirectStream::EndCommitFromChild:%p("
"%lu, %p)\n", this, df, pstChild));
if (!P_COMMIT(df))
{
_ulSize = _ulOldSize;
#ifdef SECURE_STREAMS
_ulHighWater = _ulSize;
#endif
//Stream cache is no longer valid, so nuke it.
_stmc.Empty();
}
_pdlHolder = NULL;
msfDebugOut((DEB_ITRACE,"Out CDirectStream::EndCommitFromChild()\n"));
}
//+---------------------------------------------------------------------------
//
// Member: CDirectStream::GetSize, public
//
// Synopsis: Gets the size of the stream
//
// Arguments: [pulSize] - Size return
//
// Modifies: [pulSize]
//
// History: 08-May-92 DrewB Created
//
//----------------------------------------------------------------------------
#ifdef LARGE_STREAMS
void CDirectStream::GetSize(ULONGLONG *pulSize)
#else
void CDirectStream::GetSize(ULONG *pulSize)
#endif
{
*pulSize = _ulSize;
}
//+---------------------------------------------------------------------------
//
// Member: CDirectStream::GetDeltaList, public
//
// Synopsis: Returns NULL, since a direct stream can never have
// a delta list.
//
// Arguments: None.
//
// Returns: NULL
//
// History: 30-Jul-93 PhilipLa Created
//
//----------------------------------------------------------------------------
CDeltaList * CDirectStream::GetDeltaList(void)
{
return NULL;
}
#ifdef SECURE_STREAMS
//+---------------------------------------------------------------------------
//
// Member: CDirectStream::ClearSects, private
//
// Synopsis:
//
// Arguments:
//
// Returns: void
//
// History: 10-Oct-95 PhilipLa Created
//
//----------------------------------------------------------------------------
void CDirectStream::ClearSects(ULONG ulStartOffset, ULONG ulEndOffset)
{
ULONG cbBytesToWrite = ulEndOffset - ulStartOffset;
ULONG ulOffset = ulStartOffset;
msfAssert(ulEndOffset >= ulStartOffset);
//Start offset must be less than high water mark, or the WriteAt
// will recurse.
msfAssert(ulStartOffset <= _ulHighWater);
while (cbBytesToWrite > 0)
{
ULONG cbWritten;
if (FAILED(WriteAt(ulOffset,
s_bufSecure,
min(MINISTREAMSIZE, cbBytesToWrite),
&cbWritten)))
{
break;
}
ulOffset += cbWritten;
cbBytesToWrite -= cbWritten;
}
return;
}
#endif
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