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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QBITFIELD_P_H
#define QBITFIELD_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
QT_BEGIN_NAMESPACE
class QBitField
{
public:
inline QBitField();
inline QBitField(const quint32 *, int bits);
inline QBitField(const QBitField &);
inline ~QBitField();
inline QBitField &operator=(const QBitField &);
inline quint32 size() const;
inline QBitField united(const QBitField &);
inline bool testBit(int) const;
private:
quint32 bits:31;
quint32 *ownData;
const quint32 *data;
};
QBitField::QBitField()
: bits(0), ownData(0), data(0)
{
}
QBitField::QBitField(const quint32 *bitData, int bitCount)
: bits((quint32)bitCount), ownData(0), data(bitData)
{
}
QBitField::QBitField(const QBitField &other)
: bits(other.bits), ownData(other.ownData), data(other.data)
{
if (ownData)
++(*ownData);
}
QBitField::~QBitField()
{
if (ownData)
if(0 == --(*ownData)) delete [] ownData;
}
QBitField &QBitField::operator=(const QBitField &other)
{
if (other.data == data)
return *this;
if (ownData)
if(0 == --(*ownData)) delete [] ownData;
bits = other.bits;
ownData = other.ownData;
data = other.data;
if (ownData)
++(*ownData);
return *this;
}
inline quint32 QBitField::size() const
{
return bits;
}
QBitField QBitField::united(const QBitField &o)
{
if (o.bits == 0) {
return *this;
} else if (bits == 0) {
return o;
} else {
int max = (bits > o.bits)?bits:o.bits;
int length = (max + 31) / 32;
QBitField rv;
rv.bits = max;
rv.ownData = new quint32[length + 1];
*(rv.ownData) = 1;
rv.data = rv.ownData + 1;
if (bits > o.bits) {
::memcpy((quint32 *)rv.data, data, length * sizeof(quint32));
for (quint32 ii = 0; ii < (o.bits + quint32(31)) / 32; ++ii)
((quint32 *)rv.data)[ii] |= o.data[ii];
} else {
::memcpy((quint32 *)rv.data, o.data, length * sizeof(quint32));
for (quint32 ii = 0; ii < (bits + quint32(31)) / 32; ++ii)
((quint32 *)rv.data)[ii] |= data[ii];
}
return rv;
}
}
bool QBitField::testBit(int b) const
{
Q_ASSERT(b >= 0);
if ((quint32)b < bits) {
return data[b / 32] & (1 << (b % 32));
} else {
return false;
}
}
QT_END_NAMESPACE
#endif // QBITFIELD_P_H
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