pxrandom.cpp
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- // system
- #include <stdlib.h>
- #include <time.h>
- // include
- #include "hxtypes.h"
- // pxcomlib
- #include "pxrandom.h"
- PXRandomBit::PXRandomBit(UINT32 ulPercent, UINT32 ulSeed)
- {
- // Check for input error
- if (ulPercent == 0 || ulPercent >= 100)
- {
- ulPercent = 50;
- }
- // Set the threshold
- m_ulThreshold = (ulPercent * RAND_MAX + 50) / 100;
- // Set the seed
- if (!ulSeed)
- {
- // No seed specified - use time
- ulSeed = (UINT32) time(NULL);
- }
- // Seed the random number
- srand(ulSeed);
- }
- UINT32 PXRandomBit::GetRandomBit() const
- {
- UINT32 ulRand = (UINT32) rand();
- return (ulRand >= m_ulThreshold ? 1 : 0);
- }