476 lines
9.4 KiB
C++
476 lines
9.4 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1994.
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//
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// File: extents.cxx
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//
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// Contents: Implmentation for CExtentList
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//
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// Classes: CExtentList
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//
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// Functions:
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//
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// History: 1-08-94 kevinro Created
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// 31-Jan-95 BruceMa Set size to 0 if E_OUTOFMEMORY
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// 17-Jul-95 BruceMa Add mutex to protect AddExtent (Cairo only)
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// 10-13-95 stevebl moved mutex to CFileMoniker as part of
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// adding general threadsafety to monikers
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//
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//----------------------------------------------------------------------------
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#include <ole2int.h>
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#include "extents.hxx"
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#include "mnk.h"
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CExtentList::CExtentList():
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m_pchMonikerExtents(NULL),
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m_cbMonikerExtents(0)
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{
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;
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}
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CExtentList::~CExtentList()
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{
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if (m_pchMonikerExtents != NULL)
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{
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CoTaskMemFree(m_pchMonikerExtents);
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}
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}
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::Copy
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//
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// Synopsis: Make a copy of a CExtentList
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//
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// Effects:
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//
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// Arguments: [newExtent] -- Recieving list
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//
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// Requires:
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//
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// Returns:
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-08-94 kevinro Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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HRESULT CExtentList::Copy(CExtentList & newExtent)
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{
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newExtent.m_cbMonikerExtents = m_cbMonikerExtents;
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newExtent.m_pchMonikerExtents = (BYTE *) CoTaskMemAlloc(m_cbMonikerExtents);
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if ( newExtent.m_pchMonikerExtents == NULL )
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{
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newExtent.m_cbMonikerExtents = 0;
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return(E_OUTOFMEMORY);
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}
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memcpy(newExtent.m_pchMonikerExtents,
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m_pchMonikerExtents,
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m_cbMonikerExtents);
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return(NOERROR);
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}
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::FindExtent
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//
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// Synopsis: Searches the extent list, looking for a matching extent.
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//
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// Effects:
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//
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// Arguments: [usKeyValue] --
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//
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// Requires:
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//
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// Returns: NULL not found
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// UNALIGNED POINTER to extent.
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-08-94 kevinro Created
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//
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// Notes:
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//
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// WARNINGS:
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//
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// The pointer returned is not aligned.
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//
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// The pointer will become invalide if an extent is added to the block.
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// This falls under the not multi-thread safe category. This is done for
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// efficiency reasons, since we don't ever expect to both add and lookup
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// at the same time.
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//
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//----------------------------------------------------------------------------
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MONIKEREXTENT UNALIGNED *
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CExtentList::FindExtent(USHORT usKeyValue)
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{
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ULONG ulOffset = 0;
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while(ulOffset < m_cbMonikerExtents)
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{
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MONIKEREXTENT UNALIGNED *pExtent = (MONIKEREXTENT UNALIGNED *)
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&m_pchMonikerExtents[ulOffset];
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//
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// There had better be enough bytes left to look at! If not, there
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// is some corruption in the extent block. Not much we can do about
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// it, other than return NULL
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// If the end minus the pointer is less than sizeof MONIKEREXTENT
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// we have a problem.
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if( (m_pchMonikerExtents + m_cbMonikerExtents) - ((BYTE*)pExtent ) <
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sizeof(MONIKEREXTENT) )
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{
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return(NULL);
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}
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//
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// Get the key value from the buffer and compare against what we want.
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// Be careful about alignment here.
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//
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if (pExtent->usKeyValue == usKeyValue )
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{
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return(pExtent);
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}
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ulOffset += MonikerExtentSize(pExtent);
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}
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return(NULL);
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}
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::DeleteExtent
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//
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// Synopsis: Deletes the given extent if it exists.
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//
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// Effects:
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//
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// Arguments: [usKeyValue] --
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//
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// Requires:
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//
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// Returns: S_OK -- found and deleted.
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// S_FALSE -- not found.
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-08-95 BillMo Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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#ifdef _TRACKLINK_
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HRESULT
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CExtentList::DeleteExtent(USHORT usKeyValue)
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{
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MONIKEREXTENT UNALIGNED *pExtent = FindExtent(usKeyValue);
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BYTE *pbExtent = (BYTE *)pExtent;
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if (pExtent != NULL)
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{
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ULONG cbRemove = MonikerExtentSize(pExtent);
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BYTE * pbFrom = pbExtent + cbRemove;
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MoveMemory(pbExtent,
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pbFrom,
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m_cbMonikerExtents - (pbFrom - m_pchMonikerExtents));
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m_cbMonikerExtents -= cbRemove;
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return(S_OK);
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}
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return(S_FALSE);
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}
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#endif
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::AddExtent
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//
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// Synopsis: Adds an extent to the list. This function adds a copy
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// of the data.
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// Effects:
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//
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// Arguments: [pExtent] --
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//
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// Requires:
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//
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// Returns:
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-08-94 kevinro Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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HRESULT
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CExtentList::AddExtent(MONIKEREXTENT const * pExtent)
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{
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//
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// Reallocate the current buffer to make room for the new extent
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// The new extent is appended to the end of the current list.
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//
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ULONG ulNewSize = m_cbMonikerExtents + MonikerExtentSize(pExtent);
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BYTE * pchNewBuffer;
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pchNewBuffer = (BYTE *)CoTaskMemRealloc(m_pchMonikerExtents,ulNewSize);
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if (pchNewBuffer == NULL)
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{
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return(E_OUTOFMEMORY);
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}
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m_pchMonikerExtents = pchNewBuffer;
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//
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// Append new extent
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//
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memcpy(m_pchMonikerExtents + m_cbMonikerExtents,
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pExtent,
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MonikerExtentSize(pExtent));
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m_cbMonikerExtents = ulNewSize;
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return(NOERROR);
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}
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::PutExtent
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//
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// Synopsis: Deletes the extent (if it exists) and then adds it back.
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//
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// Effects:
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//
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// Arguments: [pExtent] --
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//
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// Requires:
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//
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// Returns:
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-15-95 BillMo Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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#ifdef _TRACKLINK_
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HRESULT
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CExtentList::PutExtent(MONIKEREXTENT const * pExtent)
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{
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DeleteExtent(pExtent->usKeyValue);
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return(AddExtent(pExtent));
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}
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#endif
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//+---------------------------------------------------------------------------
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//
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// Function: Save
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//
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// Synopsis: Save the extent to a stream
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//
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// Effects: Nice straightforward write of the entire blob to a stream
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//
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// Arguments: [pStm] -- Stream to write to
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//
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// Requires:
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//
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// Returns:
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//
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// Signals:
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//
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// Modifies:
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//
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// Algorithm:
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//
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// History: 1-08-94 kevinro Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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HRESULT
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CExtentList::Save(IStream * pStm)
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{
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HRESULT hr;
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//
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// It must be true that both are zero, or neither is zero
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//
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Assert( ((m_cbMonikerExtents == 0) && (m_pchMonikerExtents == NULL)) ||
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((m_pchMonikerExtents != NULL) && (m_cbMonikerExtents != 0)));
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//
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// First, write the length, then write the blob
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//
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hr = pStm->Write((void *)&m_cbMonikerExtents,
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sizeof(m_cbMonikerExtents),
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NULL);
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if (FAILED(hr))
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{
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return(hr);
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}
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//
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// Only write moniker extents if some exist
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//
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if (m_cbMonikerExtents != 0)
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{
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hr = pStm->Write((void *)m_pchMonikerExtents,
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m_cbMonikerExtents,
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NULL);
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}
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return(hr);
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}
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::Load
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//
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// Synopsis: Load the moniker extents from stream
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//
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// Effects:
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//
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// Arguments: [pStm] -- Stream to load from
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// [ulSize] -- Size of extents, in bytes
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//
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// Requires:
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//
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// Returns:
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-08-94 kevinro Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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HRESULT
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CExtentList::Load(IStream * pStm, ULONG ulSize)
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{
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HRESULT hr;
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//
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// In the debugging verision, we should never have an extent larger
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// than say about 2k. This should catch any errors
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//
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Assert( ulSize < (2 * 1024));
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//
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// Be sure not to drop any memory. This normally should never happen.
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//
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if (m_pchMonikerExtents != NULL)
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{
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CoTaskMemFree(m_pchMonikerExtents);
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}
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m_cbMonikerExtents = ulSize;
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m_pchMonikerExtents = (BYTE *)CoTaskMemAlloc(m_cbMonikerExtents);
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if (m_pchMonikerExtents == NULL)
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{
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m_cbMonikerExtents = 0;
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return(E_OUTOFMEMORY);
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}
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hr = StRead(pStm, m_pchMonikerExtents, m_cbMonikerExtents);
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return(hr);
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}
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//+---------------------------------------------------------------------------
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//
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// Method: CExtentList::GetSize
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//
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// Synopsis: Returns the size needed to serialize this object
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//
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// Effects:
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//
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// Arguments: [pcbSize] --
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//
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// Requires:
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//
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// Returns:
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//
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// Signals:
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//
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// Modifies:
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//
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// Derivation:
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//
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// Algorithm:
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//
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// History: 1-08-94 kevinro Created
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//
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// Notes:
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//
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//----------------------------------------------------------------------------
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ULONG
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CExtentList::GetSize()
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{
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return sizeof(m_cbMonikerExtents)+m_cbMonikerExtents;
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}
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