hxbitset.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** 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 ***** */ 

#ifndef _HXBITSET_H_
#define _HXBITSET_H_

/*
 * Freely adapted from the g++ BitSet library...
 */

typedef UINT32 _BS_word;

#define _BS_CHAR_BIT 8
#define _BS_BITS_PER_WORD (_BS_CHAR_BIT*sizeof(_BS_word))
#define _BS_WORDS_NEEDED(NBITS) ((NBITS+_BS_BITS_PER_WORD-1)/_BS_BITS_PER_WORD)

/* number the bits in a _BS_word in little-endian order */
#define _BS_BIGENDIAN 0

#if _BS_BIGENDIAN
#define _BS_LEFT >>
#define _BS_RIGHT <<
#else
#define _BS_LEFT <<
#define _BS_RIGHT >>
#endif

#if _BS_BIGENDIAN
#define _BS_BITMASK(BITNO) ((_BS_word)1 << (_BS_BITS_PER_WORD - 1 - (BITNO)))
#else
#define _BS_BITMASK(BITNO) ((_BS_word)1 << (BITNO))
#endif

#define _BS_INDEX(I) ((unsigned)(I) / _BS_BITS_PER_WORD)
#define _BS_POS(I) ((I) & (_BS_BITS_PER_WORD - 1))

#define _BS_SHORT_LEN 8


class CHXBitset
{
public:
    CHXBitset();
    CHXBitset(INT32 maxBit);
    CHXBitset(BYTE* pBitmap, INT32 nCount);
    ~CHXBitset();

    void set(INT32 pos);
    void set(INT32 from, INT32 to);
    void set();			// set all bits
    void clear(INT32 pos);
    void clear(INT32 from, INT32 to);
    void clear();		// clear all bits
    BOOL test(INT32 pos);
    INT32 toByteArray(BYTE** pBitmap);
    INT32 getSize();
    INT32 getNumBits();

    BOOL test(INT32 from, INT32 to);

    void growsize(INT32 maxBit);

private:
    void setBitsetSize(INT32 nBitsetSize);

    _BS_word*	m_pBitset;
    INT32	m_nBitsetSize;
    _BS_word    m_pShortBitset[_BS_SHORT_LEN];
};

inline INT32
CHXBitset::getSize()
{
    // returns size of bitset in bytes
    return m_nBitsetSize * sizeof(_BS_word);
}

inline INT32
CHXBitset::getNumBits()
{
    return(m_nBitsetSize * _BS_BITS_PER_WORD);
}

#endif	/* _HXBITSET_H_ */