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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
**
** This file is part of Qt Creator.
**
** 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 Digia. For licensing terms and
** conditions see http://www.qt.io/licensing. 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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "readcommandblock.h"
#include <QDataStream>
#include <QIODevice>
#include <QVariant>
#include <QtDebug>
namespace CodeModelBackEnd {
ReadCommandBlock::ReadCommandBlock(QIODevice *ioDevice)
: ioDevice(ioDevice),
commandCounter(0),
blockSize(0)
{
}
void ReadCommandBlock::checkIfCommandIsLost(QDataStream &in)
{
qint64 currentCommandCounter;
in >> currentCommandCounter;
#ifndef DONT_CHECK_COMMAND_COUNTER
bool commandLost = !((currentCommandCounter == 0 && commandCounter == 0) || (commandCounter + 1 == currentCommandCounter));
if (commandLost)
qWarning() << "client command lost: " << commandCounter << currentCommandCounter;
#endif
commandCounter = currentCommandCounter;
}
QVariant ReadCommandBlock::read()
{
QDataStream in(ioDevice);
QVariant command;
if (isTheWholeCommandReadable(in)) {
checkIfCommandIsLost(in);
in >> command;
}
return command;
}
QVector<QVariant> ReadCommandBlock::readAll()
{
QVector<QVariant> commands;
while (true) {
const QVariant command = read();
if (command.isValid())
commands.append(command);
else
return commands;
}
Q_UNREACHABLE();
}
void ReadCommandBlock::resetCounter()
{
commandCounter = 0;
}
bool ReadCommandBlock::isTheWholeCommandReadable(QDataStream &in)
{
const qint64 bytesAvailable = ioDevice->bytesAvailable();
if (bytesAvailable == 0)
return false;
if (blockSize == 0)
in >> blockSize;
if (bytesAvailable < blockSize)
return false;
blockSize = 0;
return true;
}
} // namespace CodeModelBackEnd
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