94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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encode.cxx
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Abstract:
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This module provides encoing functions to convert a binary blob of data so
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that it can be embedded in a search filter.
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Author:
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Shankara Shastry (ShankSh) 12-Mar-1997
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Revision History:
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--*/
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#include "procs.hxx"
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#pragma hdrstop
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#include "oleds.hxx"
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WCHAR HexToWCharTable[17] = L"0123456789ABCDEF";
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//
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// Helper function to support allowing opaque blobs of data in search filters.
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// This API takes any filter element and adds necessary escape characters
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// such that when the element hits the wire in the search request, it will
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// be equal to the opaque blob past in here as source.
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//
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//
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// The destination string ppszDestData needs to be freed using FreeAdsMem after
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// using it.
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//
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HRESULT
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ADsEncodeBinaryData (
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PBYTE pbSrcData,
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DWORD dwSrcLen,
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LPWSTR * ppszDestData
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)
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{
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LPWSTR pszDest = NULL, pszDestPtr = NULL;
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DWORD lengthRequired = 0;
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DWORD dwSrcCount = 0;
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WCHAR wch;
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if (!ppszDestData || (!pbSrcData && dwSrcLen))
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RRETURN(E_ADS_BAD_PARAMETER);
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*ppszDestData = NULL;
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//
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// figure out how long of a buffer we need.
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//
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lengthRequired = ((dwSrcLen * 2) + 1) * sizeof(WCHAR);
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pszDest = (LPWSTR) AllocADsMem( lengthRequired );
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if (pszDest == NULL)
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RRETURN (E_OUTOFMEMORY );
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pszDestPtr = pszDest;
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//
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// For each byte in source string, copy it to dest string but we first
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// expand it out such that each nibble is it's own character (UNICODE)
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//
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while (++dwSrcCount <= dwSrcLen) {
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wch = ( (*pbSrcData) & 0xF0 ) >> 4;
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*(pszDestPtr++) = HexToWCharTable[wch];
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wch = (*(pbSrcData++)) & 0x0F;
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*(pszDestPtr++) = HexToWCharTable[wch];
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}
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*pszDestPtr = '\0';
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*ppszDestData = pszDest;
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RRETURN (S_OK);
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}
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