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329 lines
9.2 KiB
329 lines
9.2 KiB
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// Microsoft Corporation 1997
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//
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// This file contains methods for copying and releasing STGMEDIUMs and BINDINFOs
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// (which contains a STGMEDIUM).
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//
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// Created: 8-15-97 t-gpease
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//
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#include <urlmon.hxx>
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#undef URLMONOFFSETOF
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#define URLMONOFFSETOF(t,f) ((DWORD_PTR)(&((t*)0)->f))
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//
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// This function clears the BINDINFO structure.
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//
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//- The "cbSize" will not be clear and will be the same as it
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// was pasted in. This is by design so that you can reuse the
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// BINDINFO (eg copy another BINDINFO into it).
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//
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//- It does NOT release the memory that the BINDINFO oocupies
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// (this could be on the stack).
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//
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//- It does properly release items that the BINDINFO might be
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// pointing to.
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//
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STDAPI_(void)
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ReleaseBindInfo(BINDINFO * pbindinfo)
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{
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if ( !pbindinfo)
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return;
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DWORD cb = pbindinfo->cbSize;
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UrlMkAssert( cb &&
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"CopyBindInfo(): cbSize of the BINDINFO is ZERO. We need the cbSize to be set before calling us.");
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if(!cb )
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return; // we don't know which structure it is, so don't touch it.
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if (cb >= URLMONOFFSETOF(BINDINFO, dwReserved) && pbindinfo->pUnk)
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{
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pbindinfo->pUnk->Release();
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}
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// Orginal BINDINFO no need to check size
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if (pbindinfo->szExtraInfo)
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{
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delete [] pbindinfo->szExtraInfo;
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}
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// Orginal BINDINFO no need to check size
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if (pbindinfo->szCustomVerb)
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{
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delete [] pbindinfo->szCustomVerb;
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}
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// Orginal BINDINFO no need to check size
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ReleaseStgMedium(&pbindinfo->stgmedData);
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// set this to zero so other function will not try to use the BINDINFO
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ZeroMemory(pbindinfo, cb);
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pbindinfo->cbSize = cb; // but keep this intact
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return;
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}
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//
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// This function copies STGMEDIUM stuctures.
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//
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//- Users need to allocate the memory that the STGMEDIUM Dest will be copied
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// into.
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//
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//- If anything goes wrong, we return the proper HRESULT and STGMEDIUM.will
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// have been zero-ed.
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//
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STDAPI
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CopyStgMedium(const STGMEDIUM * pcstgmedSrc,
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STGMEDIUM * pstgmedDest)
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{
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HRESULT hr = S_OK;
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if ( !pcstgmedSrc || !pstgmedDest )
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return E_POINTER;
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ZeroMemory(pstgmedDest, sizeof(*pstgmedDest));
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switch (pcstgmedSrc->tymed)
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{
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case TYMED_HGLOBAL:
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{
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void * pvDest;
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const void * pcvSrc;
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DWORD_PTR dwcbLen;
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HGLOBAL hGlobalDest;
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if (!pcstgmedSrc->hGlobal)
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break; // nothing to do
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hr = E_OUTOFMEMORY;
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pcvSrc = GlobalLock(pcstgmedSrc->hGlobal);
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if (!pcvSrc)
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goto Cleanup;
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dwcbLen = GlobalSize(pcstgmedSrc->hGlobal);
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// We can't do the following line:
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// hGlobalDest = GlobalAlloc((GMEM_MOVEABLE | GMEM_SHARE), dwcbLen);
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// because we hand out the bindinfo.stgmedData.hglobal to callers
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// that do NOT lock it and use the handle instead of the pointer.
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hGlobalDest = GlobalAlloc(GMEM_FIXED | GMEM_SHARE, dwcbLen);
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if (!hGlobalDest)
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{
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GlobalUnlock(pcstgmedSrc->hGlobal);
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goto Cleanup;
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}
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pvDest = GlobalLock(hGlobalDest);
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if (!pvDest)
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{
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GlobalFree(hGlobalDest);
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GlobalUnlock(pcstgmedSrc->hGlobal);
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goto Cleanup;
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}
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UrlMkAssert(dwcbLen>>32 == 0);
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memcpy(pvDest, pcvSrc, (unsigned long)dwcbLen);
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pstgmedDest->hGlobal = hGlobalDest;
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GlobalUnlock(hGlobalDest);
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GlobalUnlock(pcstgmedSrc->hGlobal);
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hr = S_OK;
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}
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break;
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case TYMED_FILE:
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{
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if (!pcstgmedSrc->lpszFileName)
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break; // nothing to do
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hr = E_OUTOFMEMORY;
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LPWSTR lpwstr = OLESTRDuplicate(pcstgmedSrc->lpszFileName);
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if (!lpwstr)
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goto Cleanup;
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pstgmedDest->lpszFileName = lpwstr;
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hr = S_OK;
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}
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break;
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case TYMED_ISTREAM:
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{
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pstgmedDest->pstm = pcstgmedSrc->pstm;
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if ( pstgmedDest->pstm )
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pstgmedDest->pstm->AddRef();
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}
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break;
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case TYMED_ISTORAGE:
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{
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pstgmedDest->pstg = pcstgmedSrc->pstg;
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if ( pstgmedDest->pstg )
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pstgmedDest->pstg->AddRef();
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}
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break;
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default:
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UrlMkAssert( !"CloneStgMedium has encountered a TYMED it doesn't know how to copy." );
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// fall thru and copy it.
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case TYMED_NULL: // blindly copy
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case TYMED_GDI: // Just copy...
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memcpy(pstgmedDest, pcstgmedSrc, sizeof(*pstgmedDest));
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break;
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}
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// Common things that can be copied if we get to this point.
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pstgmedDest->tymed = pcstgmedSrc->tymed;
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pstgmedDest->pUnkForRelease = pcstgmedSrc->pUnkForRelease;
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if (pstgmedDest->pUnkForRelease)
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(pstgmedDest->pUnkForRelease)->AddRef();
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Cleanup:
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return hr;
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}
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//
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// This function copies BINDINFO structures.
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//
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// NOTE: IE4 added properties to the BINDINFO structure. This function
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// works with both versions. If the structure is extended in the
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// future, it will blindly copy the additional properties in the
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// structure.
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//
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//- Users need to allocate the memory that the BINDINFO Dest will be copied
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// into.
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//
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//- Users also need to set the "cbSize" of the BINDINFO Dest to
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// the sizeof(BINDINFO) before calling (see NOTE above).
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//
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//- If there is a "cbSize" conflict between the Src and the Dest, we will:
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// 1) Src->cbSize = Dest->cbSize, normal copy.
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// 2) Src->cbSize > Dest->cbSize, copy as much info about the Src into
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// the Dest as will fit.
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// 3) Src->cbSize < Dest->cbSize, copy the Src into the Dest, Zero the
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// remaining unfilled portion of the Dest.
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//
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//- We don't not copy the securityattribute. We clear this value of the
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// BINDINFO Dest.
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//
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//- If anything goes wrong, we return the proper HRESULT and clear the
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// the BINDINFO structure using ReleaseBindInfo() (below).
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// NOTE: If "cbSize" of the Dest is ZERO, we don't do anything.
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//
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STDAPI
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CopyBindInfo( const BINDINFO * pcbiSrc,
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BINDINFO *pbiDest )
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{
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/****** 8-15-97 t-gpease
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Current structure at the time of writing... from URLMON.H
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typedef struct tagBINDINFO {
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ULONG cbSize;
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LPWSTR szExtraInfo;
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STGMEDIUM stgmedData;
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DWORD grfBindInfoF;
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DWORD dwBindVerb;
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LPWSTR szCustomVerb;
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DWORD cbstgmedData;
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// new part below this line //
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DWORD dwOptions;
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DWORD dwOptionsFlags;
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DWORD dwCodePage;
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SECURITY_ATTRIBUTES securityAttributes;
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IID iid;
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IUnknown __RPC_FAR *pUnk;
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DWORD dwReserved;
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} BINDINFO;
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Anything bigger than this we will blindly copy.the size of cbSize
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*******/
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// NOTE: hr will an error until just before the Cleanup label.
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HRESULT hr = E_INVALIDARG;
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DWORD cbSrc;
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DWORD cbDst;
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if (!pcbiSrc || !pbiDest)
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return E_POINTER;
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cbSrc = pcbiSrc->cbSize;
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cbDst = pbiDest->cbSize;
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UrlMkAssert( cbSrc &&
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"CopyBindInfo(): cbSize of the source is ZERO. You must set the cbSize.");
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UrlMkAssert( cbDst &&
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"CopyBindInfo(): cbSize of the destination is ZERO. It needs to be set to the size of the BINDINFO before calling us.");
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if (!cbSrc || !cbDst)
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goto Abort; // nothing to do or can do.
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// Copy those bytes in common, zero the rest if any
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memcpy(pbiDest, pcbiSrc, min(cbSrc, cbDst));
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pbiDest->cbSize = cbDst; // always keep this intact
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if (cbDst > cbSrc)
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{
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ZeroMemory((BYTE *)pbiDest + cbSrc, cbDst - cbSrc);
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}
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if (cbDst >= URLMONOFFSETOF(BINDINFO, dwReserved))
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{
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ZeroMemory(&pbiDest->securityAttributes, sizeof(SECURITY_ATTRIBUTES));
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}
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if (pcbiSrc->pUnk && cbDst >= URLMONOFFSETOF(BINDINFO, dwReserved))
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{
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pbiDest->pUnk->AddRef();
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}
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// NULL these anything fails we don't want to free the Sources resources.
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pbiDest->szExtraInfo = NULL;
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pbiDest->szCustomVerb = NULL;
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// Original BINDINFO no need to check size
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hr = CopyStgMedium( &pcbiSrc->stgmedData, &pbiDest->stgmedData );
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if (hr)
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goto Cleanup;
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// Original BINDINFO no need to check size
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if (pcbiSrc->szExtraInfo)
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{
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LPWSTR lpwstr = OLESTRDuplicate(pcbiSrc->szExtraInfo);
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if (!lpwstr)
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{
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hr = E_OUTOFMEMORY;
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goto Cleanup;
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}
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pbiDest->szExtraInfo= lpwstr;
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}
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// Original BINDINFO no need to check size
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if (pcbiSrc->szCustomVerb)
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{
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LPWSTR lpwstr = OLESTRDuplicate(pcbiSrc->szCustomVerb);
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if (!lpwstr)
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{
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hr = E_OUTOFMEMORY;
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goto Cleanup;
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}
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pbiDest->szCustomVerb= lpwstr;
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}
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Cleanup:
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if (hr)
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{
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// This will set pbiDest members to zero so other function will not
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// try to use the new BINDINFO.
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ReleaseBindInfo( pbiDest );
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}
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Abort:
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return(hr);
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}
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