457 lines
11 KiB
C++
457 lines
11 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: vect.cxx
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//
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// Contents: Vector common code.
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//
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// Classes:
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//
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// Functions:
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//
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//----------------------------------------------------------------------------
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#include <msfhead.cxx>
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#include <vect.hxx>
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//+-------------------------------------------------------------------------
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//
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// Method: CPagedVector::Init, public
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//
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// Synopsis: CPagedVector initialization function
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//
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// Arguments: [ulSize] -- size of vector
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// [uFatEntries] -- number of entries in each table
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//
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// Algorithm: Allocate an array of pointer of size ulSize
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// For each cell in the array, allocate a CFatSect
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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SCODE VECT_NEAR CPagedVector::Init(CMStream *pmsParent, ULONG ulSize)
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{
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msfDebugOut((DEB_ITRACE,"In CPagedVector::CPagedVector(%lu)\n",ulSize));
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SCODE sc = S_OK;
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_pmsParent = pmsParent;
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_pmpt = _pmsParent->GetPageTable();
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msfAssert(_pmpt != NULL);
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USHORT i;
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// We don't bother allocating more than necessary here
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_ulAllocSize = _ulSize = ulSize;
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if (_ulSize > 0)
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{
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msfMem(_amp = GetNewPageArray(ulSize));
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for (i = 0; i < _ulSize; i++)
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{
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_amp[i] = NULL;
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}
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msfMem(_avb = GetNewVectBits(ulSize));
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}
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msfDebugOut((DEB_ITRACE,"Out CPagedVector::CPagedVector()\n"));
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return S_OK;
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Err:
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//In the error case, discard whatever vectors we were able to allocate
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// and return S_OK.
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delete [] _amp;
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_amp = NULL;
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delete [] _avb;
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_avb = NULL;
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return S_OK;
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CPagedVector::~CPagedVector, public
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//
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// Synopsis: CPagedVector constructor
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//
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// Algorithm: Delete the pointer array.
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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VECT_NEAR CPagedVector::~CPagedVector()
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{
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delete [] _amp;
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delete [] _avb;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CPagedVector::Empty, public
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//
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// Synopsis: Discard the storage associated with this vector.
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//
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// Arguments: None.
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//
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// Returns: void.
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//
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//----------------------------------------------------------------------------
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void CPagedVector::Empty(void)
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{
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if (_pmpt != NULL)
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{
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_pmpt->FreePages(this);
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}
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delete [] _amp;
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delete [] _avb;
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_amp = NULL;
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_avb = NULL;
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_pmpt = NULL;
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_ulAllocSize = _ulSize = 0;
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_pmsParent = NULL;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CPagedVector::Flush, public
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//
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// Synopsis: Flush the dirty pages for this vector
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//
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// Arguments: None.
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//
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// Returns: Appropriate status code
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//
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//----------------------------------------------------------------------------
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SCODE CPagedVector::Flush(void)
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{
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SCODE sc;
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SCODE scRet = S_OK;
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if (_ulSize > 0)
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{
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if (_amp != NULL)
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{
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for (USHORT i = 0; i < _ulSize; i++)
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{
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if ((_amp[i] != NULL) && (_amp[i]->IsDirty()))
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{
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sc = _pmpt->FlushPage(_amp[i]);
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if ((FAILED(sc)) && (SUCCEEDED(scRet)))
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{
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scRet = sc;
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}
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}
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}
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}
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else
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{
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scRet = _pmpt->Flush();
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}
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}
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return scRet;
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CPagedVector::GetTable, public
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//
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// Synopsis: Return a pointer to a page for the given index
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// into the vector.
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//
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// Arguments: [iTable] -- index into vector
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// [ppmp] -- Pointer to return location
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//
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// Returns: S_OK if call completed OK.
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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SCODE VECT_NEAR CPagedVector::GetTable(
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const FSINDEX iTable,
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DWORD dwFlags,
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void **ppmp)
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{
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SCODE sc = S_OK;
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CMSFPage *pmp;
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msfAssert((_pmsParent->GetILB() != NULL) &&
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aMsg("Null ILB found on GetTable - need SetAccess call?"));
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if ((_amp == NULL) || (_amp[iTable] == NULL))
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{
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if (dwFlags & FB_NEW)
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{
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//We know that the page isn't in the page table,
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// so we can just get a free page an allocate it
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// ourselves.
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msfChk(_pmpt->GetFreePage(&pmp));
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pmp->SetVector(this);
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pmp->SetSid(_sid);
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pmp->SetOffset(iTable);
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pmp->SetSect(ENDOFCHAIN);
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sc = STG_S_NEWPAGE;
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dwFlags = (dwFlags & ~FB_NEW) | FB_DIRTY;
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}
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else
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{
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msfChk(_pmpt->GetPage(this, _sid, iTable, &pmp));
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msfAssert((pmp->GetVector() == this) &&
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aMsg("GetPage returned wrong page."));
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}
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if (_amp != NULL)
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{
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_amp[iTable] = pmp;
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}
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}
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else
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{
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pmp = _amp[iTable];
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msfAssert((pmp->GetVector() == this) &&
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aMsg("Cached page has wrong vector pointer"));
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}
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pmp->AddRef();
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if (((dwFlags & FB_DIRTY) && !(pmp->IsDirty())) &&
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(sc != STG_S_NEWPAGE))
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{
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//If we are not a newly created page, and we are being
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// dirtied for the first time, make sure that our
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// _sect field is correct.
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//
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//Newly created pages have to have their sect set manually
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// _before_ being released. This is very important.
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pmp->SetSect(ENDOFCHAIN);
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SECT sect;
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msfChkTo(Err_Rel, _pmsParent->GetESect(
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pmp->GetSid(),
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pmp->GetOffset(),
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§));
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pmp->SetSect(sect);
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}
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pmp->SetFlags(pmp->GetFlags() | dwFlags | FB_TOUCHED);
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msfAssert((pmp->GetVector() == this) &&
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aMsg("GetTable returned wrong page."));
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*ppmp = pmp->GetData();
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Err:
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return sc;
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Err_Rel:
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pmp->Release();
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return sc;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CPagedVector::SetDirty, public
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//
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// Synopsis: Set the dirty bit on the specified page
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//
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// Arguments: [iTable] -- Table to set bit on
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//
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// Notes: This function is always called on a page with an
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// open reference. Therefore, the page is
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// guaranteed to be in the page table, and that
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// FindPage call should never return an error.
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//
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//----------------------------------------------------------------------------
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SCODE CPagedVector::SetDirty(ULONG iTable)
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{
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SCODE sc = S_OK;
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CMSFPage *pmp;
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if (_amp == NULL)
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{
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msfChk(_pmpt->FindPage(this, _sid, iTable, &pmp));
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msfAssert(sc == STG_S_FOUND);
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msfAssert(pmp->IsInUse() &&
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aMsg("Called SetDirty on page not in use."));
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}
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else
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{
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msfAssert(_amp != NULL);
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msfAssert(_amp[iTable] != NULL);
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pmp = _amp[iTable];
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}
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if (!pmp->IsDirty())
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{
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//We are not a newly created page, and we are being
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// dirtied for the first time, make sure that our
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// _sect field is correct.
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//
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pmp->AddRef();
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pmp->SetSect(ENDOFCHAIN);
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SECT sect;
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msfChkTo(Err_Rel, _pmsParent->GetESect(
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pmp->GetSid(),
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pmp->GetOffset(),
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§));
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pmp->SetSect(sect);
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pmp->Release();
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}
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pmp->SetDirty();
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Err:
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return sc;
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Err_Rel:
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pmp->Release();
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return sc;
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CPagedVector::Resize, public
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//
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// Synopsis: Resize a CPagedVector
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//
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// Arguments: [ulSize] -- Size of new vector
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//
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// Algorithm: Create new pointer array of size ulSize.
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// For each entry in old array, copy the pointer over.
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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#define LARGETHRESHOLD 1024
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#define VECTORBLOCK 1024 // Must be power of 2
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SCODE VECT_NEAR CPagedVector::Resize(FSINDEX ulSize)
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{
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msfDebugOut((DEB_ITRACE,"In CPagedVector::CPagedVector(%lu)\n",ulSize));
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msfAssert(ulSize >= _ulSize);
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msfAssert(_ulSize <= _ulAllocSize);
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msfAssert(((VECTORBLOCK & (VECTORBLOCK - 1)) == 0) &&
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aMsg("VECTORBLOCK must be power of 2"));
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msfAssert(!((_amp == NULL) && (_avb != NULL)) &&
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aMsg("Resize precondition failed."));
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if (ulSize > _ulAllocSize)
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{
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// We don't have room in the existing vector; grow it
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ULONG ulNewAllocSize = ulSize;
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if (ulNewAllocSize > LARGETHRESHOLD)
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{
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// We're dealing with a large vector; grow it a VECTORBLOCK
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// at a time
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ulNewAllocSize = (ulNewAllocSize + VECTORBLOCK - 1) &
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~(VECTORBLOCK - 1);
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}
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CMSFPage **amp = GetNewPageArray(ulNewAllocSize);
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CVectBits *avb = GetNewVectBits(ulNewAllocSize);
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// Can't fail after this point
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_ulAllocSize = ulNewAllocSize;
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// Copy over the old entries
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if ((amp != NULL) && (avb != NULL))
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{
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if ((_amp != NULL) && (_avb != NULL))
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{
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// Both allocations succeeded
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for (ULONG iamp = 0; iamp < _ulSize; iamp++)
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{
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amp[iamp] = _amp[iamp];
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avb[iamp] = _avb[iamp];
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}
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}
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else if (_amp != NULL)
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{
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for (ULONG iamp = 0; iamp < _ulSize; iamp++)
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{
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amp[iamp] = _amp[iamp];
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}
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}
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else
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{
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for (ULONG iamp = 0; iamp < _ulSize; iamp++)
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{
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amp[iamp] = NULL;
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}
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}
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}
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else
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{
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// At least one of the allocations failed
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delete [] avb;
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avb = NULL;
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|
delete [] amp;
|
||
|
|
amp = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delete the old vector and put in the new one (if any).
|
||
|
|
// In the error case, throw away the vectors we are currently
|
||
|
|
// holding (since they are of insufficient size) and return S_OK.
|
||
|
|
|
||
|
|
delete [] _amp;
|
||
|
|
_amp = amp;
|
||
|
|
|
||
|
|
delete [] _avb;
|
||
|
|
_avb = avb;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (_amp != NULL)
|
||
|
|
{
|
||
|
|
// Initialize the new elements in the vector
|
||
|
|
|
||
|
|
for (ULONG iamp = _ulSize; iamp < ulSize; iamp++)
|
||
|
|
_amp[iamp] = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
_ulSize = ulSize;
|
||
|
|
|
||
|
|
msfDebugOut((DEB_ITRACE,"Out CPagedVector resize constructor\n"));
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|