351 lines
9.8 KiB
C++
351 lines
9.8 KiB
C++
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#include "priv.h"
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#include "stream.h"
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#define _DBLNext(pdbList) ((LPDBLIST)(((LPBYTE)(pdbList)) + (pdbList)->cbSize ))
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#define DBSIG_WRAP ((DWORD)-1)
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extern "C" {
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HRESULT SHWriteDataBlockList(IStream* pstm, LPDBLIST pdbList)
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{
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HRESULT hr = S_OK;
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if (pdbList)
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{
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for ( ; pdbList->cbSize; pdbList = _DBLNext(pdbList))
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{
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LPDATABLOCK_HEADER pdb;
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ULONG cbBytes;
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pdb = pdbList;
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if (DBSIG_WRAP == pdb->dwSignature)
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pdb++;
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TraceMsg(TF_DBLIST, "Writing extra data block, size:%x sig:%x", pdb->cbSize, pdb->dwSignature);
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if (FAILED(hr = ((CMemStream*)pstm)->Write((LPBYTE)pdb, pdb->cbSize, &cbBytes)))
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break;
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if (cbBytes != pdb->cbSize)
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{
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hr = STG_E_MEDIUMFULL;
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break;
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}
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}
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}
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// NULL terminate the list
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if (SUCCEEDED(hr))
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{
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DWORD dwData = 0;
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DWORD cbBytes;
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hr = ((CMemStream*)pstm)->Write(&dwData, SIZEOF(dwData), &cbBytes);
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}
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return(hr);
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}
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HRESULT SHReadDataBlockList(IStream* pstm, LPDBLIST * ppdbList)
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{
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HRESULT hres;
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BYTE buf[200]; // all blocks today fit in this size (tested at 5)
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LPDATABLOCK_HEADER lpBuf = (LPDATABLOCK_HEADER)buf;
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DWORD cbBuf = SIZEOF(buf);
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DWORD dwSizeToRead, cbBytes;
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if (*ppdbList)
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{
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LocalFree((HLOCAL)(*ppdbList));
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*ppdbList = NULL;
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}
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while (TRUE)
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{
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DWORD cbSize;
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dwSizeToRead = SIZEOF(cbSize);
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hres = ((CMemStream*)pstm)->Read(&cbSize, dwSizeToRead, &cbBytes);
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if (SUCCEEDED(hres) && (cbBytes == dwSizeToRead))
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{
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// Windows 95 and NT 4 shipped a CShellLink that did NOT
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// NULL terminate the data it wrote out to the stream.
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// If more data was persisted after the CShellLink then
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// we will read in garbage. No real harm comes of this (*)
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// (because it is unlikely we'll get a dwSignature match)
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// but if the first dword is huge, we'll allocate a ton
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// of memory and page it in. This can take MINUTES on Win95.
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// Assume anything over 64K is from one of these
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// bogus streams.
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// (*) actually, real harm comes because we don't leave the
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// stream in the correct place. Forms^3 put a work-around
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// in for this bug.
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if (cbSize > 0x0000FFFF)
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{
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ULARGE_INTEGER liStart;
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LARGE_INTEGER liMove;
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// We read a DWORD of data that wasn't ours, back up.
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// NOTE: all of our stream implementations assume
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// HighPart == 0
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liMove.HighPart = liMove.LowPart = 0;
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if (SUCCEEDED(((CMemStream*)pstm)->Seek(liMove, STREAM_SEEK_CUR, &liStart)))
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{
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ASSERT(liStart.HighPart == 0);
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ASSERT(liStart.LowPart >= SIZEOF(cbSize));
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liMove.LowPart = liStart.LowPart - SIZEOF(cbSize);
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((CMemStream*)pstm)->Seek(liMove, STREAM_SEEK_SET, NULL);
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}
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TraceMsg(TF_DBLIST, "ASSUMING NO NULL TERMINATION (FOR SIZE 0x%x)", cbSize);
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cbSize = 0;
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}
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// If we hit the 0 terminator, we're done.
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if (cbSize < SIZEOF(DATABLOCK_HEADER))
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break;
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// Make sure we can read this block in.
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if (cbSize > cbBuf)
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{
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HLOCAL pTemp;
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if (lpBuf == (LPDATABLOCK_HEADER)buf)
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pTemp = LocalAlloc(LPTR, cbSize);
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else
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pTemp = LocalReAlloc((HLOCAL)lpBuf, cbSize, LMEM_ZEROINIT | LMEM_MOVEABLE);
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if (pTemp)
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{
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lpBuf = (LPDATABLOCK_HEADER)pTemp;
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cbBuf = cbSize;
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}
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else
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{
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hres = E_OUTOFMEMORY;
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break;
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}
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}
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// Read in data block
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lpBuf->cbSize = cbSize;
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dwSizeToRead = cbSize - SIZEOF(cbSize);
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hres = ((CMemStream*)pstm)->Read((LPBYTE)&(lpBuf->dwSignature), dwSizeToRead, &cbBytes);
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if (SUCCEEDED(hres) && (cbBytes == dwSizeToRead))
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{
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TraceMsg(TF_DBLIST, "Reading extra data block, size:%x sig:%x", lpBuf->cbSize, lpBuf->dwSignature);
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SHAddDataBlock(ppdbList, lpBuf);
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}
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else
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break;
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}
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else
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break;
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}
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// Free any allocated buffer
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if (lpBuf != (LPDATABLOCK_HEADER)buf)
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{
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LocalFree((HLOCAL)lpBuf);
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}
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return(hres);
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}
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void SHFreeDataBlockList(LPDBLIST pdbList)
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{
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if (pdbList)
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{
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LocalFree((HLOCAL)pdbList);
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}
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}
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BOOL SHAddDataBlock(LPDBLIST * ppdbList, LPDATABLOCK_HEADER pdb)
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{
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LPDBLIST pdbCopyTo = NULL;
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DWORD dwSize;
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// Don't let anyone use our special signature
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if (DBSIG_WRAP == pdb->dwSignature ||
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pdb->cbSize < SIZEOF(*pdb))
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{
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TraceMsg(TF_DBLIST, "SHAddDataBlock invalid datablock! (sig:%x size:%x)", pdb->dwSignature, pdb->cbSize);
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return E_INVALIDARG;
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}
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// Figure out how much space we need to hold this block
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dwSize = pdb->cbSize;
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if (pdb->cbSize & 0x3)
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{
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dwSize = ((dwSize + 3) & ~0x3) + SIZEOF(DATABLOCK_HEADER);
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TraceMsg(TF_DBLIST, "Adding non-DWORD data block, size:%x sig:%x", pdb->cbSize, pdb->dwSignature);
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}
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else
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{
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TraceMsg(TF_DBLIST, "Adding data block, size:%x sig:%x", pdb->cbSize, pdb->dwSignature);
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}
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// Allocate the space
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if (!*ppdbList)
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{
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*ppdbList = (LPDBLIST)LocalAlloc(LPTR, dwSize + SIZEOF(DWORD)); // include NULL terminator
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pdbCopyTo = *ppdbList;
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}
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else
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{
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DWORD dwTotalSize = 0;
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LPDBLIST pdbList;
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HLOCAL lpTmp;
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for (pdbList = *ppdbList ; pdbList->cbSize ; pdbList = _DBLNext(pdbList))
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dwTotalSize += pdbList->cbSize;
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lpTmp = LocalReAlloc((HLOCAL)*ppdbList, dwTotalSize + dwSize + SIZEOF(DWORD), // include NULL terminator
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LMEM_ZEROINIT | LMEM_MOVEABLE);
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if (lpTmp)
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{
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*ppdbList = (LPDBLIST)lpTmp;
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pdbCopyTo = (LPDBLIST)(((LPBYTE)lpTmp) + dwTotalSize);
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}
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}
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// Copy the data block
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if (pdbCopyTo)
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{
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LPBYTE pTmp = (LPBYTE)pdbCopyTo;
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// This block would cause other blocks to be
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// unaligned, wrap it
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ASSERT(0 == (dwSize & 0x3));
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if (dwSize != pdb->cbSize)
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{
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pdbCopyTo->cbSize = dwSize;
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pdbCopyTo->dwSignature = DBSIG_WRAP;
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pTmp = (LPBYTE)(pdbCopyTo + 1);
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}
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CopyMemory(pTmp, pdb, pdb->cbSize);
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// NULL terminate the list
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_DBLNext(pdbCopyTo)->cbSize = 0;
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return TRUE;
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}
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return FALSE;
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}
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BOOL SHRemoveDataBlock(LPDBLIST * ppdbList, DWORD dwSignature)
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{
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LPDBLIST pdbRemove = NULL;
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// Can't call SHFindDataBlock because that returnes the
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// block that was wrapped, we want the block that wraps.
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if (*ppdbList)
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{
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LPDBLIST pdbList = *ppdbList;
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for ( ; pdbList->cbSize ; pdbList = _DBLNext(pdbList))
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{
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if (dwSignature == pdbList->dwSignature)
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{
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TraceMsg(TF_DBLIST, "Removing data block, size:%x sig:%x ptr:%x", pdbList->cbSize, pdbList->dwSignature, pdbList);
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pdbRemove = pdbList;
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break;
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}
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else if (DBSIG_WRAP == pdbList->dwSignature)
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{
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LPDBLIST pdbWrap = pdbList + 1;
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if (dwSignature == pdbWrap->dwSignature)
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{
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TraceMsg(TF_DBLIST, "Removing non-DWORD data block, size:%x sig:%x ptr:", pdbWrap->cbSize, pdbWrap->dwSignature, pdbWrap);
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pdbRemove = pdbList;
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break;
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}
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}
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}
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}
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if (pdbRemove)
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{
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LPDBLIST pdbNext = _DBLNext(pdbRemove);
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LPDBLIST pdbEnd;
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DWORD dwSizeOfBlockToRemove;
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LONG lNewSize;
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for (pdbEnd = pdbNext ; pdbEnd->cbSize ; pdbEnd = _DBLNext(pdbEnd))
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;
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dwSizeOfBlockToRemove = pdbRemove->cbSize;
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// Move remaining memory down
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MoveMemory(pdbRemove, pdbNext, (DWORD_PTR)pdbEnd - (DWORD_PTR)pdbNext + SIZEOF(DWORD));
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// Shrink our buffer
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lNewSize = (LONG) LocalSize(*ppdbList ) - dwSizeOfBlockToRemove;
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if (lNewSize > SIZEOF(DWORD))
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{
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LPVOID lpVoid;
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if (NULL != (lpVoid = LocalReAlloc( (HLOCAL)*ppdbList, lNewSize, LMEM_ZEROINIT | LMEM_MOVEABLE )))
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{
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*ppdbList = (LPDBLIST)lpVoid;
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}
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}
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else
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{
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// We've removed the last section, delete the whole deal
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LocalFree( (HLOCAL)(*ppdbList) );
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*ppdbList = NULL;
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}
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return TRUE;
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}
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return FALSE;
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}
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LPVOID SHFindDataBlock(LPDBLIST pdbList, DWORD dwSignature)
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{
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if (pdbList)
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{
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for ( ; pdbList->cbSize ; pdbList = _DBLNext(pdbList))
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{
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if (dwSignature == pdbList->dwSignature)
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{
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TraceMsg(TF_DBLIST, "Found data block, size:%x sig:%x ptr:%x", pdbList->cbSize, pdbList->dwSignature, pdbList);
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return (LPVOID)pdbList;
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}
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else if (DBSIG_WRAP == pdbList->dwSignature)
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{
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LPDBLIST pdbWrap = pdbList + 1;
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if (dwSignature == pdbWrap->dwSignature)
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{
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TraceMsg(TF_DBLIST, "Found non-DWORD data block, size:%x sig:%x ptr:%x", pdbWrap->cbSize, pdbWrap->dwSignature, pdbWrap);
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return (LPVOID)pdbWrap;
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}
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}
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}
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}
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return NULL;
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}
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} // extern "C"
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