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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QENDIAN_P_H
#define QENDIAN_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/qendian.h>
QT_BEGIN_NAMESPACE
template<class S>
class QSpecialInteger
{
typedef typename S::StorageType T;
T val;
public:
QSpecialInteger() = default;
explicit Q_DECL_CONSTEXPR QSpecialInteger(T i) : val(S::toSpecial(i)) {}
QSpecialInteger &operator =(T i) { val = S::toSpecial(i); return *this; }
operator T() const { return S::fromSpecial(val); }
bool operator ==(QSpecialInteger<S> i) const { return val == i.val; }
bool operator !=(QSpecialInteger<S> i) const { return val != i.val; }
QSpecialInteger &operator +=(T i)
{ return (*this = S::fromSpecial(val) + i); }
QSpecialInteger &operator -=(T i)
{ return (*this = S::fromSpecial(val) - i); }
QSpecialInteger &operator *=(T i)
{ return (*this = S::fromSpecial(val) * i); }
QSpecialInteger &operator >>=(T i)
{ return (*this = S::fromSpecial(val) >> i); }
QSpecialInteger &operator <<=(T i)
{ return (*this = S::fromSpecial(val) << i); }
QSpecialInteger &operator /=(T i)
{ return (*this = S::fromSpecial(val) / i); }
QSpecialInteger &operator %=(T i)
{ return (*this = S::fromSpecial(val) % i); }
QSpecialInteger &operator |=(T i)
{ return (*this = S::fromSpecial(val) | i); }
QSpecialInteger &operator &=(T i)
{ return (*this = S::fromSpecial(val) & i); }
QSpecialInteger &operator ^=(T i)
{ return (*this = S::fromSpecial(val) ^ i); }
};
template<typename T>
class QLittleEndianStorageType {
public:
typedef T StorageType;
static Q_DECL_CONSTEXPR T toSpecial(T source) { return qToLittleEndian(source); }
static Q_DECL_CONSTEXPR T fromSpecial(T source) { return qFromLittleEndian(source); }
};
template<typename T>
class QBigEndianStorageType {
public:
typedef T StorageType;
static Q_DECL_CONSTEXPR T toSpecial(T source) { return qToBigEndian(source); }
static Q_DECL_CONSTEXPR T fromSpecial(T source) { return qFromBigEndian(source); }
};
template<typename T>
using QLEInteger = QSpecialInteger<QLittleEndianStorageType<T>>;
template<typename T>
using QBEInteger = QSpecialInteger<QBigEndianStorageType<T>>;
template <typename T>
class QTypeInfo<QLEInteger<T> >
: public QTypeInfoMerger<QLEInteger<T>, T> {};
template <typename T>
class QTypeInfo<QBEInteger<T> >
: public QTypeInfoMerger<QBEInteger<T>, T> {};
typedef QLEInteger<qint16> qint16_le;
typedef QLEInteger<qint32> qint32_le;
typedef QLEInteger<qint64> qint64_le;
typedef QLEInteger<quint16> quint16_le;
typedef QLEInteger<quint32> quint32_le;
typedef QLEInteger<quint64> quint64_le;
typedef QBEInteger<qint16> qint16_be;
typedef QBEInteger<qint32> qint32_be;
typedef QBEInteger<qint64> qint64_be;
typedef QBEInteger<quint16> quint16_be;
typedef QBEInteger<quint32> quint32_be;
typedef QBEInteger<quint64> quint64_be;
// Note if using multiple of these bitfields in a union; the underlying storage type must
// match. Since we always use an unsigned storage type, unsigned and signed versions may
// be used together, but different bit-widths may not.
template<class S, int pos, int width>
class QSpecialIntegerBitfield
{
protected:
typedef typename S::StorageType T;
typedef typename std::make_unsigned<T>::type UT;
static Q_DECL_CONSTEXPR UT mask()
{
return ((UT(1) << width) - 1) << pos;
}
public:
// FIXME: val is public until qtdeclarative is fixed to not access it directly.
UT val;
QSpecialIntegerBitfield &operator =(T t)
{
UT i = S::fromSpecial(val);
i &= ~mask();
i |= (UT(t) << pos) & mask();
val = S::toSpecial(i);
return *this;
}
operator T() const
{
if (std::is_signed<T>::value) {
UT i = S::fromSpecial(val);
i <<= (sizeof(T) * 8) - width - pos;
T t = T(i);
t >>= (sizeof(T) * 8) - width;
return t;
}
return (S::fromSpecial(val) & mask()) >> pos;
}
bool operator !() const { return !(val & S::toSpecial(mask())); }
bool operator ==(QSpecialIntegerBitfield<S, pos, width> i) const
{ return ((val ^ i.val) & S::toSpecial(mask())) == 0; }
bool operator !=(QSpecialIntegerBitfield<S, pos, width> i) const
{ return ((val ^ i.val) & S::toSpecial(mask())) != 0; }
QSpecialIntegerBitfield &operator +=(T i)
{ return (*this = (T(*this) + i)); }
QSpecialIntegerBitfield &operator -=(T i)
{ return (*this = (T(*this) - i)); }
QSpecialIntegerBitfield &operator *=(T i)
{ return (*this = (T(*this) * i)); }
QSpecialIntegerBitfield &operator /=(T i)
{ return (*this = (T(*this) / i)); }
QSpecialIntegerBitfield &operator %=(T i)
{ return (*this = (T(*this) % i)); }
QSpecialIntegerBitfield &operator |=(T i)
{ return (*this = (T(*this) | i)); }
QSpecialIntegerBitfield &operator &=(T i)
{ return (*this = (T(*this) & i)); }
QSpecialIntegerBitfield &operator ^=(T i)
{ return (*this = (T(*this) ^ i)); }
QSpecialIntegerBitfield &operator >>=(T i)
{ return (*this = (T(*this) >> i)); }
QSpecialIntegerBitfield &operator <<=(T i)
{ return (*this = (T(*this) << i)); }
};
template<typename T, int pos, int width>
using QLEIntegerBitfield = QSpecialIntegerBitfield<QLittleEndianStorageType<T>, pos, width>;
template<typename T, int pos, int width>
using QBEIntegerBitfield = QSpecialIntegerBitfield<QBigEndianStorageType<T>, pos, width>;
template<int pos, int width>
using qint32_le_bitfield = QLEIntegerBitfield<int, pos, width>;
template<int pos, int width>
using quint32_le_bitfield = QLEIntegerBitfield<uint, pos, width>;
template<int pos, int width>
using qint32_be_bitfield = QBEIntegerBitfield<int, pos, width>;
template<int pos, int width>
using quint32_be_bitfield = QBEIntegerBitfield<uint, pos, width>;
QT_END_NAMESPACE
#endif // QENDIAN_P_H
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