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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd
** All rights reserved.
** For any questions to The Qt Company, please use contact form at http://www.qt.io/contact-us
**
** This file is part of the Qt Enterprise Perf Profiler Add-on.
**
** GNU General Public License Usage
** This file may be used under the terms of the GNU General Public License
** version 3 as published by the Free Software Foundation and appearing in
** the file LICENSE.GPLv3 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.html.
**
** If you have questions regarding the use of this file, please use
** contact form at http://www.qt.io/contact-us
**
****************************************************************************/
#include "perfstdin.h"
#include <QTimer>
#include <cstring>
#include <cstdio>
#include <limits>
PerfStdin::PerfStdin(QObject *parent) : QIODevice(parent)
{
connect(&m_timer, &QTimer::timeout, this, &PerfStdin::receiveData);
}
PerfStdin::~PerfStdin()
{
if (isOpen())
close();
}
bool PerfStdin::open(QIODevice::OpenMode mode)
{
if (!(mode & QIODevice::ReadOnly) || (mode & QIODevice::WriteOnly))
return false;
if (QIODevice::open(mode)) {
m_buffer.resize(s_minBufferSize);
m_timer.start();
return true;
} else {
return false;
}
}
void PerfStdin::close()
{
m_timer.stop();
QIODevice::close();
}
qint64 PerfStdin::readData(char *data, qint64 maxlen)
{
if (maxlen <= 0)
return 0;
qint64 read = 0;
do {
Q_ASSERT(m_buffer.length() >= m_bufferPos);
Q_ASSERT(m_buffer.length() >= m_bufferUsed);
Q_ASSERT(m_bufferPos <= m_bufferUsed);
const size_t buffered = static_cast<size_t>(qMin(bufferedAvailable(), maxlen - read));
memcpy(data + read, m_buffer.constData() + m_bufferPos, buffered);
m_bufferPos += buffered;
read += buffered;
} while (read < maxlen && fillBuffer(maxlen) > 0);
Q_ASSERT(read > 0 || bufferedAvailable() == 0);
return (read == 0 && stdinAtEnd()) ? -1 : read;
}
qint64 PerfStdin::writeData(const char *data, qint64 len)
{
Q_UNUSED(data);
Q_UNUSED(len);
return -1;
}
void PerfStdin::receiveData()
{
if (fillBuffer() > 0)
emit readyRead();
else if (stdinAtEnd())
close();
}
void PerfStdin::resizeBuffer(int newSize)
{
QByteArray newBuffer(newSize, Qt::Uninitialized);
std::memcpy(newBuffer.data(), m_buffer.data() + m_bufferPos,
static_cast<size_t>(m_bufferUsed - m_bufferPos));
qSwap(m_buffer, newBuffer);
m_bufferUsed -= m_bufferPos;
Q_ASSERT(m_buffer.length() >= m_bufferUsed);
m_bufferPos = 0;
}
qint64 PerfStdin::fillBuffer(qint64 targetBufferSize)
{
if (m_bufferUsed == m_bufferPos)
m_bufferPos = m_bufferUsed = 0;
targetBufferSize = qMin(targetBufferSize, static_cast<qint64>(s_maxBufferSize));
if (targetBufferSize > m_buffer.length())
resizeBuffer(static_cast<int>(targetBufferSize));
if (m_bufferUsed == m_buffer.length()) {
if (m_bufferPos == 0) {
resizeBuffer(m_bufferUsed <= s_maxBufferSize / 2 ? m_bufferUsed * 2
: s_maxBufferSize);
} else {
resizeBuffer(m_bufferUsed);
}
}
const size_t read = fread(m_buffer.data() + m_bufferUsed, 1,
static_cast<size_t>(m_buffer.length() - m_bufferUsed), stdin);
m_bufferUsed += read;
Q_ASSERT(m_buffer.length() >= m_bufferUsed);
return static_cast<qint64>(read);
}
bool PerfStdin::stdinAtEnd() const
{
return feof(stdin) || ferror(stdin);
}
bool PerfStdin::isSequential() const
{
return true;
}
qint64 PerfStdin::bytesAvailable() const
{
return bufferedAvailable() + QIODevice::bytesAvailable();
}
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