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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "qiopipe.h"
#include <QtCore/private/qobject_p.h>
#include <QtCore/qpointer.h>
#include <QDebug>
#include <memory>
QT_BEGIN_NAMESPACE
class QPipeEndPoint : public QIODevice
{
Q_OBJECT
public:
bool isSequential() const override;
qint64 bytesAvailable() const override;
void setRemoteEndPoint(QPipeEndPoint *other);
protected:
qint64 readData(char *data, qint64 maxlen) override;
qint64 writeData(const char *data, qint64 len) override;
private:
QByteArray m_buffer;
QPointer<QPipeEndPoint> m_remoteEndPoint;
};
class QIOPipePrivate final : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QIOPipe)
public:
QIOPipePrivate();
~QIOPipePrivate() override;
std::unique_ptr<QPipeEndPoint> end1;
std::unique_ptr<QPipeEndPoint> end2;
};
QIOPipe::QIOPipe(QObject *parent) :
QObject(*(new QIOPipePrivate()), parent)
{
}
bool QIOPipe::open(QIODevice::OpenMode mode)
{
Q_D(QIOPipe);
if (!d->end1->open(mode))
return false;
switch (mode & QIODevice::ReadWrite) {
case QIODevice::WriteOnly:
case QIODevice::ReadOnly:
return d->end2->open(mode ^ QIODevice::ReadWrite);
default:
return d->end2->open(mode);
}
}
QIODevice *QIOPipe::end1() const
{
Q_D(const QIOPipe);
return d->end1.get();
}
QIODevice *QIOPipe::end2() const
{
Q_D(const QIOPipe);
return d->end2.get();
}
QIOPipePrivate::QIOPipePrivate() :
end1(std::make_unique<QPipeEndPoint>()),
end2(std::make_unique<QPipeEndPoint>())
{
end1->setRemoteEndPoint(end2.get());
end2->setRemoteEndPoint(end1.get());
}
QIOPipePrivate::~QIOPipePrivate()
{
}
bool QPipeEndPoint::isSequential() const
{
return true;
}
qint64 QPipeEndPoint::bytesAvailable() const
{
return m_buffer.size() + QIODevice::bytesAvailable();
}
void QPipeEndPoint::setRemoteEndPoint(QPipeEndPoint *other)
{
m_remoteEndPoint = other;
}
qint64 QPipeEndPoint::readData(char *data, qint64 maxlen)
{
maxlen = qMin(maxlen, static_cast<qint64>(m_buffer.size()));
if (maxlen <= 0)
return 0;
Q_ASSERT(maxlen > 0);
Q_ASSERT(maxlen <= std::numeric_limits<int>::max());
memcpy(data, m_buffer.data(), static_cast<size_t>(maxlen));
m_buffer = m_buffer.mid(static_cast<int>(maxlen));
return maxlen;
}
qint64 QPipeEndPoint::writeData(const char *data, qint64 len)
{
if (!m_remoteEndPoint)
return -1;
if (len <= 0)
return 0;
QByteArray &buffer = m_remoteEndPoint->m_buffer;
const qint64 prevLen = buffer.size();
Q_ASSERT(prevLen >= 0);
len = qMin(len, std::numeric_limits<int>::max() - prevLen);
if (len == 0)
return 0;
Q_ASSERT(len > 0);
Q_ASSERT(prevLen + len > 0);
Q_ASSERT(prevLen + len <= std::numeric_limits<int>::max());
buffer.resize(static_cast<int>(prevLen + len));
memcpy(buffer.data() + prevLen, data, static_cast<size_t>(len));
emit bytesWritten(len);
emit m_remoteEndPoint->readyRead();
return len;
}
QT_END_NAMESPACE
#include <qiopipe.moc>
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