keepassxc/src/core/Endian.h

/*
 *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
 *  Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 or (at your option)
 *  version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef KEEPASSX_ENDIAN_H
#define KEEPASSX_ENDIAN_H

#include <QByteArray>
#include <QSysInfo>
#include <QtEndian>
#include <QIODevice>

namespace Endian
{

template<typename SizedQInt>
SizedQInt bytesToSizedInt(const QByteArray& ba, QSysInfo::Endian byteOrder)
{
    Q_ASSERT(ba.size() == sizeof(SizedQInt));

    if (byteOrder == QSysInfo::LittleEndian) {
        return qFromLittleEndian<SizedQInt>(reinterpret_cast<const uchar*>(ba.constData()));
    }
    return qFromBigEndian<SizedQInt>(reinterpret_cast<const uchar*>(ba.constData()));
}

template<typename SizedQInt>
SizedQInt readSizedInt(QIODevice* device, QSysInfo::Endian byteOrder, bool* ok)
{
    QByteArray ba = device->read(sizeof(SizedQInt));

    if (ba.size() != sizeof(SizedQInt)) {
        *ok = false;
        return 0;
    }
    *ok = true;
    return bytesToSizedInt<SizedQInt>(ba, byteOrder);
}

template<typename SizedQInt>
QByteArray sizedIntToBytes(SizedQInt num, QSysInfo::Endian byteOrder)
{
    QByteArray ba;
    ba.resize(sizeof(SizedQInt));

    if (byteOrder == QSysInfo::LittleEndian) {
        qToLittleEndian<SizedQInt>(num, reinterpret_cast<uchar*>(ba.data()));
    } else {
        qToBigEndian<SizedQInt>(num, reinterpret_cast<uchar*>(ba.data()));
    }

    return ba;
}

template<typename SizedQInt>
bool writeSizedInt(SizedQInt num, QIODevice* device, QSysInfo::Endian byteOrder)
{
    QByteArray ba = sizedIntToBytes<SizedQInt>(num, byteOrder);
    qint64 bytesWritten = device->write(ba);
    return (bytesWritten == ba.size());
}

} // namespace Endian

#endif // KEEPASSX_ENDIAN_H