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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 "perfheader.h"
#include <QDebug>
PerfHeader::PerfHeader(QIODevice *source) :
m_source(source), m_magic(0), m_size(0), m_attrSize(0)
{
connect(source, &QIODevice::readyRead, this, &PerfHeader::read);
connect(source, &QIODevice::aboutToClose, this, &PerfHeader::error);
for (uint i = 0; i < sizeof(m_features) / sizeof(quint64); ++i)
m_features[i] = 0;
}
void PerfHeader::read()
{
const uint featureParts = sizeof(m_features) / sizeof(quint64);
QDataStream stream(m_source);
if (m_size == 0) {
if (!m_source->isSequential() && m_source->size() < pipeHeaderFixedLength()) {
qWarning() << "File is too small for perf header.";
emit error();
return;
}
if (m_source->bytesAvailable() < pipeHeaderFixedLength())
return;
stream >> m_magic;
if (m_magic != s_magicSame && m_magic != s_magicSwitched) {
qWarning() << "invalid magic:" << m_magic;
qWarning() << "we don't support V1 perf data";
emit error();
return;
} else {
stream.setByteOrder(byteOrder());
}
stream >> m_size;
}
if (m_size < pipeHeaderFixedLength()) {
qWarning() << "Header claims to be smaller than magic + size:" << m_size;
emit error();
return;
} else if (m_size > pipeHeaderFixedLength()) {
// read extended header information only available in perf.data files,
// not in piped perf streams
if (!m_source->isSequential() && m_source->size() < fileHeaderFixedLength()) {
qWarning() << "File is too small for perf header.";
emit error();
return;
}
if (m_source->bytesAvailable() < fileHeaderFixedLength() - pipeHeaderFixedLength())
return;
// file header
stream >> m_attrSize >> m_attrs >> m_data >> m_eventTypes;
for (uint i = 0; i < featureParts; ++i)
stream >> m_features[i];
if (m_magic == s_magicSwitched && !hasFeature(HOSTNAME)) {
quint32 *features32 = reinterpret_cast<quint32 *>(&m_features[0]);
for (uint i = 0; i < featureParts; ++i)
qSwap(features32[i * 2], features32[i * 2 + 1]);
if (!hasFeature(HOSTNAME)) {
// It borked: blank it all
qWarning() << "bad feature data:" << m_features;
for (uint i = 0; i < featureParts; ++i)
m_features[i] = 0;
setFeature(BUILD_ID);
}
}
const auto minimumFileSize = static_cast<qint64>(dataOffset() + dataSize());
if (!m_source->isSequential() && m_source->size() < minimumFileSize) {
qWarning() << "File is too small to hold perf data.";
emit error();
return;
}
if (m_size > fileHeaderFixedLength()) {
if (m_size > std::numeric_limits<int>::max()) {
qWarning() << "Excessively large perf file header:" << m_size;
emit error();
return;
}
qWarning() << "Header not completely read.";
stream.skipRawData(static_cast<int>(m_size) - fileHeaderFixedLength());
}
} else {
// pipe header, anything to do here?
}
disconnect(m_source, &QIODevice::readyRead, this, &PerfHeader::read);
disconnect(m_source, &QIODevice::aboutToClose, this, &PerfHeader::error);
m_source = nullptr;
emit finished();
}
quint16 PerfHeader::pipeHeaderFixedLength()
{
return sizeof(m_magic) + sizeof(m_size);
}
quint16 PerfHeader::fileHeaderFixedLength()
{
return pipeHeaderFixedLength()
+ sizeof(m_attrSize)
+ 3 * PerfFileSection::fixedLength() // m_attrs, m_data, m_eventTypes
+ sizeof(m_features);
}
QDataStream::ByteOrder PerfHeader::byteOrder() const
{
// magic is read in QDataStream's default big endian mode
return m_magic == s_magicSame ? QDataStream::BigEndian : QDataStream::LittleEndian;
}
void PerfHeader::setFeature(PerfHeader::Feature feature)
{
Q_ASSERT(feature >= 0 && feature < sizeof(m_features) * sizeof(quint64));
m_features[feature / 64] |= (1ULL << (feature % 64));
}
void PerfHeader::clearFeature(PerfHeader::Feature feature)
{
Q_ASSERT(feature >= 0 && feature < sizeof(m_features) * sizeof(quint64));
m_features[feature / 64] &= ~(1ULL << (feature % 64));
}
bool PerfHeader::hasFeature(PerfHeader::Feature feature) const
{
Q_ASSERT(feature >= 0 && feature < sizeof(m_features) * sizeof(quint64));
return (m_features[feature / 64] & (1ULL << (feature % 64))) != 0;
}
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