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285 lines
8.5 KiB
285 lines
8.5 KiB
//+--------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1992
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//
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// File: chinst.cxx
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//
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// Contents: DocFile child instance management code
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//
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// History: 19-Nov-91 DrewB Created
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//
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//---------------------------------------------------------------
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#include <dfhead.cxx>
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#pragma hdrstop
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// Permissions checked in the less-restrictive rule
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#define TCANTSET DF_READ
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#define DCANTSET (DF_READ | DF_WRITE)
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#define CANTCLEAR (DF_DENYREAD | DF_DENYWRITE)
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//+--------------------------------------------------------------
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//
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// Method: CChildInstanceList::Add, private
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//
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// Synopsis: Registers an instance of a child
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//
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// Arguments: [prv] - Child
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//
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// History: 17-Oct-91 DrewB Created
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CChildInstanceList_Add)
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#endif
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void CChildInstanceList::Add(PRevertable *prv)
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{
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olDebugOut((DEB_ITRACE, "In CChildInstanceList::Add(%p)\n", prv));
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prv->_prvNext = _prvHead;
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_prvHead = P_TO_BP(CBasedRevertablePtr, prv);
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olDebugOut((DEB_ITRACE, "Out CChildInstanceList::Add\n"));
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CChildInstanceList::FindByName, private
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//
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// Synopsis: Finds a child instance by name
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//
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// Arguments: [pdfn] - Name
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//
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// Returns: Pointer to instance or NULL
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//
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// History: 12-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CChildInstanceList_FindByName)
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#endif
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PRevertable *CChildInstanceList::FindByName(CDfName const *pdfn)
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{
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PRevertable *prv;
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olDebugOut((DEB_ITRACE, "In CChildInstanceList::FindByName:%p(%ws)\n",
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this, pdfn->GetBuffer()));
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for (prv = BP_TO_P(PRevertable *, _prvHead);
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prv;
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prv = BP_TO_P(PRevertable *, prv->_prvNext))
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{
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if (prv->_dfn.IsEqual(pdfn))
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return prv;
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}
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olDebugOut((DEB_ITRACE, "Out CChildInstanceList::FindByName\n"));
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return NULL;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CChildInstanceList::FlushBufferedData, private
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//
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// Synopsis: Calls each child, instructing it to flush property data.
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//
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// Arguments: [recursionlevel] -- current level in hierachy below initial
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// entry point.
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//
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// Returns: SCODE
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//
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// History: 5-May-1995 BillMo Created
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//
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//----------------------------------------------------------------------------
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#ifdef NEWPROPS
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CChildInstanceList_FindByName)
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#endif
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SCODE CChildInstanceList::FlushBufferedData(int recursionlevel)
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{
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PRevertable *prv;
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SCODE sc = S_OK;
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olDebugOut((DEB_ITRACE, "In CChildInstanceList::FlushBufferedData:%p\n",
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this));
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for (prv = BP_TO_P(PRevertable *, _prvHead);
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prv && sc == S_OK;
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prv = BP_TO_P(PRevertable *, prv->_prvNext))
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{
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sc = prv->FlushBufferedData(recursionlevel + 1);
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}
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olDebugOut((DEB_ITRACE, "Out CChildInstanceList::FlushBufferedData\n"));
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return sc;
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}
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#endif
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//+--------------------------------------------------------------
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//
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// Method: CChildInstanceList::DeleteByName, private
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//
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// Synopsis: Removes an instance from the instance list
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// and reverts it
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//
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// Arguments: [pdfn] - Name or NULL
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//
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// History: 17-Oct-91 DrewB Created
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//
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// Notes: The entry does not have to exist
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// There can be multiple entries
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// If name is NULL, all entries match
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CChildInstanceList_DeleteByName)
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#endif
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void CChildInstanceList::DeleteByName(CDfName const *pdfn)
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{
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CBasedRevertablePtr *pprv;
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olDebugOut((DEB_ITRACE, "In CChildInstanceList::DeleteByName(%ws)\n",
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pdfn->GetBuffer()));
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for (pprv = &_prvHead; *pprv; )
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if (NULL == pdfn || (*pprv)->_dfn.IsEqual(pdfn))
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{
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(*pprv)->RevertFromAbove();
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*pprv = (*pprv)->_prvNext;
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}
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else
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pprv = &(*pprv)->_prvNext;
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olDebugOut((DEB_ITRACE, "Out CChildInstanceList::DeleteByName\n"));
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}
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//+--------------------------------------------------------------
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//
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// Method: CChildInstanceList::RemoveRv, private
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//
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// Synopsis: Removes a specific instance from the instance list
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//
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// Arguments: [prv] - Instance
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//
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// History: 17-Oct-91 DrewB Created
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//
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// Notes: The entry does not have to exist
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CChildInstanceList_RemoveRv)
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#endif
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void CChildInstanceList::RemoveRv(PRevertable *prvRv)
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{
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CBasedRevertablePtr *prv;
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olDebugOut((DEB_ITRACE, "In CChildInstanceList::RemoveRv(%p)\n", prvRv));
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for (prv = &_prvHead; *prv; prv = &(*prv)->_prvNext)
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if (*prv == prvRv)
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{
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*prv = (*prv)->_prvNext;
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break;
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}
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olDebugOut((DEB_ITRACE, "Out CChildInstanceList::RemoveRv\n"));
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}
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//+--------------------------------------------------------------
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//
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// Method: CChildInstanceList::IsDenied, private
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//
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// Synopsis: Checks the parent instantiation list for a previous
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// instance of the given child with DENY flags on
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// Also determines whether child mode flags are
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// less restrictive than the parent's
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//
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// Arguments: [pdfn] - Instance name
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// [dfCheck] - Access modes to check for denial
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// [dfAgainst] - Access modes to check against
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//
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// Returns: Appropriate status code
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//
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// History: 17-Oct-91 DrewB Created
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// 28-Oct-92 AlexT Converted to names
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//
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// Notes: The instance doesn't have to be in the list.
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// If it isn't, it's not denied
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CChildInstanceList_IsDenied)
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#endif
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SCODE CChildInstanceList::IsDenied(CDfName const *pdfn,
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DFLAGS const dfCheck,
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DFLAGS const dfAgainst)
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{
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PRevertable *prv;
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SCODE sc = S_OK;
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olDebugOut((DEB_ITRACE, "In CChildInstanceList::IsDenied("
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"%p, %lX, %lX)\n", pdfn, dfCheck, dfAgainst));
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olAssert(pdfn != NULL && aMsg("IsDenied, null name"));
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// Check to see if permissions are less restrictive than
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// parent permissions
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// This checks to see that a child isn't specifying
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// a permission that its parent doesn't
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// For example, giving read permission when the parent
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// doesn't
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if ((~dfAgainst & dfCheck &
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(P_TRANSACTED(dfAgainst) ? TCANTSET : DCANTSET)) ||
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(dfAgainst & ~dfCheck & CANTCLEAR))
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olErr(EH_Err, STG_E_INVALIDFLAG);
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// Check for DENY_*
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olAssert((DF_DENYALL >> DF_DENIALSHIFT) == DF_READWRITE);
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for (prv = BP_TO_P(PRevertable *, _prvHead);
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prv != NULL; prv = prv->GetNext())
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{
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if (prv->_dfn.IsEqual(pdfn))
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{
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// Check for existing instance with DENY_* mode
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if ((((prv->GetDFlags() & DF_DENYALL) >> DF_DENIALSHIFT) &
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dfCheck) != 0 ||
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// Check for instance with permission already given that
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// new instance wants to deny
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(((dfCheck & DF_DENYALL) >> DF_DENIALSHIFT) &
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prv->GetDFlags()) != 0)
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{
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sc = STG_E_ACCESSDENIED;
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break;
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}
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}
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}
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olDebugOut((DEB_ITRACE, "Out CChildInstanceList::IsDenied\n"));
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// Fall through
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EH_Err:
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return sc;
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}
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//+--------------------------------------------------------------
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//
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// Member: CChildInstanceList::EmptyCache, public
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//
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// Synopsis: empties the stream caches
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//
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// History: 22-Jun-99 HenryLee Created
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//
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//---------------------------------------------------------------
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void CChildInstanceList::EmptyCache ()
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{
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for (PRevertable *prv = BP_TO_P(PRevertable *, _prvHead);
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prv != NULL; prv = prv->GetNext())
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{
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prv->EmptyCache();
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}
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}
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