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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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>
#include <QtCore/qtypeinfo.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;
quint32 *rvdata;
rv.data = rvdata = rv.ownData + 1;
if (bits > o.bits) {
::memcpy(rvdata, data, length * sizeof(quint32));
for (quint32 ii = 0; ii < (o.bits + quint32(31)) / 32; ++ii)
(rvdata)[ii] |= o.data[ii];
} else {
::memcpy(rvdata, o.data, length * sizeof(quint32));
for (quint32 ii = 0; ii < (bits + quint32(31)) / 32; ++ii)
(rvdata)[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;
}
}
Q_DECLARE_TYPEINFO(QBitField, Q_MOVABLE_TYPE);
QT_END_NAMESPACE
#endif // QBITFIELD_P_H
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