126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1993.
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//
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// File: rothelp.cxx
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//
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// Contents: Implementation of helpers used by SCM and OLE32
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//
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// Functions: CreateFileMonikerComparisonBuffer
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//
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// History: 30-Jan-95 Ricksa Created
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//
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//--------------------------------------------------------------------------
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#include <ole2int.h>
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#include <rothint.hxx>
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#include <rothelp.hxx>
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//+-------------------------------------------------------------------------
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//
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// Function: ScmRotHash
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//
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// Synopsis: Calculate hash value of comparison buffer in the SCM.
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//
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// Arguments: [pbKey] - pointer to buffer
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// [cdwKey] - size of buffer
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// [dwInitHash] - Initial hash value
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//
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// Returns: Hash value for SCM ROT entry.
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//
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// History: 30-Jan-95 Ricksa Created
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// 30-Nov-95 BruceMa Don't let the hash value overflow
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//
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// Note: The 3rd parameter is used only by RunningMoniker which
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// needs to compute partial hashes by path components
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//
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//--------------------------------------------------------------------------
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DWORD ScmRotHash(BYTE *pbKey, DWORD cdwKey, DWORD dwInitHash)
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{
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CairoleDebugOut((DEB_ROT, "%p _IN ScmRotHash"
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"( %p , %lx )\n", NULL, pbKey, cdwKey));
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DWORD dwResult = dwInitHash;
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for (DWORD i = 0; i < cdwKey; i++)
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{
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dwResult *= 3;
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dwResult ^= *pbKey;
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dwResult %= SCM_HASH_SIZE;
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pbKey++;
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}
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CairoleDebugOut((DEB_ROT, "%p OUT ScmRotHash"
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"( %lx )\n", NULL, dwResult % SCM_HASH_SIZE));
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return dwResult;
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}
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//+-------------------------------------------------------------------------
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//
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// Function: CreateFileMonikerComparisonBuffer
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//
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// Synopsis: Convert a file path to a moniker comparison buffer
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//
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// Arguments: [pwszPath] - path
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// [pbBuffer] - comparison buffer
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// [cdwMaxSize] - maximum size of the comparison buffer
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// [cdwUsed] - number of bytes used in the comparison buffer
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//
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// Returns: NOERROR - comparison buffer successfully created
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// E_OUTOFMEMORY - The buffer was not big enough to hold the data.
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//
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// History: 30-Jan-95 Ricksa Created
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//
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//--------------------------------------------------------------------------
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HRESULT CreateFileMonikerComparisonBuffer(
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WCHAR *pwszPath,
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BYTE *pbBuffer,
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DWORD cdwMaxSize,
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DWORD *pcdwUsed)
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{
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CairoleDebugOut((DEB_ROT, "%p _IN CreateFileMonikerComparisonBuffer"
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"( %p , %p , %lx , %p )\n", NULL, pwszPath, pbBuffer, cdwMaxSize,
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pcdwUsed));
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// Assume there will be an error
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HRESULT hr = E_OUTOFMEMORY;
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*pcdwUsed = 0;
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// Cache size needed for path locally. Of course, the "+1" is required
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// for the terminating NUL in the string.
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DWORD cdwPath = (lstrlenW(pwszPath) + 1) * sizeof(WCHAR);
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// Figure out if the buffer is being enough to hold the data.
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DWORD cdwSizeNeeded = sizeof(CLSID) + cdwPath;
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if (cdwSizeNeeded <= cdwMaxSize)
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{
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// Copy in the CLSID for a file moniker
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memcpy(pbBuffer, &CLSID_FileMoniker, sizeof(CLSID_FileMoniker));
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// Copy in the path
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memcpy(pbBuffer + sizeof(CLSID_FileMoniker), pwszPath, cdwPath);
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// Uppercase the path in the comparison buffer
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CharUpperW((WCHAR *) (pbBuffer + sizeof(CLSID_FileMoniker)));
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*pcdwUsed = cdwSizeNeeded;
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hr = NOERROR;
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}
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CairoleDebugOut((DEB_ROT, "%p OUT CreateFileMonikerComparisonBuffer"
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"( %lx ) [ %lx ]\n", NULL, hr, *pcdwUsed));
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return hr;
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}
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