VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/misc/RTMemWipeThoroughly.cpp@ 44298

Last change on this file since 44298 was 30827, checked in by vboxsync, 14 years ago

iprt/mem.h: Added RTMemWipeThoroughly().

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 1.7 KB
Line 
1/* $Id: RTMemWipeThoroughly.cpp 30827 2010-07-14 12:49:36Z vboxsync $ */
2/** @file
3 * IPRT - RTMemWipeThoroughly.
4 */
5
6/*
7 * Copyright (C) 2008-2010 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*******************************************************************************
29* Header Files *
30*******************************************************************************/
31#include <iprt/mem.h>
32#include "internal/iprt.h"
33
34#include <iprt/asm.h>
35#include <iprt/rand.h>
36#include <iprt/string.h>
37
38
39RTDECL(void) RTMemWipeThoroughly(void *pv, size_t cb, size_t cMinPasses) RT_NO_THROW
40{
41 size_t cPasses = RT_MIN(cMinPasses, 6);
42
43 do
44 {
45 memset(pv, 0xff, cb);
46 ASMMemoryFence();
47
48 memset(pv, 0x00, cb);
49 ASMMemoryFence();
50
51 RTRandBytes(pv, cb);
52 ASMMemoryFence();
53 } while (cPasses-- > 0);
54}
55
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