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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2021 Alex Trotsenko <alex1973tr@gmail.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QWINDOWSPIPEREADER_P_H
#define QWINDOWSPIPEREADER_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 <qobject.h>
#include <qmutex.h>
#include <private/qringbuffer_p.h>
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QWindowsPipeReader : public QObject
{
Q_OBJECT
public:
explicit QWindowsPipeReader(QObject *parent = nullptr);
~QWindowsPipeReader();
void setHandle(HANDLE hPipeReadEnd);
void startAsyncRead();
void stop();
void drainAndStop();
void stopAndClear();
void setMaxReadBufferSize(qint64 size);
qint64 maxReadBufferSize() const { return readBufferMaxSize; }
bool isPipeClosed() const { return pipeBroken; }
qint64 bytesAvailable() const;
qint64 read(char *data, qint64 maxlen);
qint64 readLine(char *data, qint64 maxlen);
qint64 skip(qint64 maxlen);
bool canReadLine() const;
DWORD checkPipeState();
bool checkForReadyRead() { return consumePendingAndEmit(false); }
bool isReadOperationActive() const;
HANDLE syncEvent() const { return syncHandle; }
Q_SIGNALS:
void winError(ulong, const QString &);
void readyRead();
void pipeClosed();
protected:
bool event(QEvent *e) override;
private:
enum State { Stopped, Running, Draining };
void startAsyncReadHelper(QMutexLocker<QMutex> *locker);
void startAsyncReadLocked();
void cancelAsyncRead(State newState);
static void CALLBACK waitCallback(PTP_CALLBACK_INSTANCE instance, PVOID context,
PTP_WAIT wait, TP_WAIT_RESULT waitResult);
bool readCompleted(DWORD errorCode, DWORD numberOfBytesRead);
bool waitForNotification();
bool consumePendingAndEmit(bool allowWinActPosting);
bool consumePending();
HANDLE handle;
HANDLE eventHandle;
HANDLE syncHandle;
PTP_WAIT waitObject;
OVERLAPPED overlapped;
qint64 readBufferMaxSize;
QRingBuffer readBuffer;
qint64 actualReadBufferSize;
qint64 pendingReadBytes;
mutable QMutex mutex;
DWORD lastError;
State state;
bool readSequenceStarted;
bool pipeBroken;
bool readyReadPending;
bool winEventActPosted;
};
QT_END_NAMESPACE
#endif // QWINDOWSPIPEREADER_P_H
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