forked from Mirrors/wine-wine
79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/*
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* SHLWAPI IStream functions
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*
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* Copyright 2002 Jon Griffiths
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdarg.h>
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#include <string.h>
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#define COBJMACROS
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#define NONAMELESSUNION
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#include "windef.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "winnls.h"
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#define NO_SHLWAPI_REG
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#define NO_SHLWAPI_PATH
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#include "shlwapi.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(shell);
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/*************************************************************************
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* @ [SHLWAPI.166]
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*
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* Determine if a stream has 0 length.
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*
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* PARAMS
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* lpStream [I] IStream object
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*
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* RETURNS
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* TRUE: If the stream has 0 length
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* FALSE: Otherwise.
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*/
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BOOL WINAPI SHIsEmptyStream(IStream *lpStream)
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{
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STATSTG statstg;
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BOOL bRet = TRUE;
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TRACE("(%p)\n", lpStream);
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memset(&statstg, 0, sizeof(statstg));
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if(SUCCEEDED(IStream_Stat(lpStream, &statstg, 1)))
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{
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if(statstg.cbSize.QuadPart)
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bRet = FALSE; /* Non-Zero */
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}
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else
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{
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DWORD dummy, read_len;
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/* Try to read from the stream */
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if (SUCCEEDED(IStream_Read(lpStream, &dummy, sizeof(dummy), &read_len)) && read_len == sizeof(dummy))
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{
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LARGE_INTEGER zero;
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zero.QuadPart = 0;
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IStream_Seek(lpStream, zero, 0, NULL);
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bRet = FALSE; /* Non-Zero */
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}
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}
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return bRet;
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}
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