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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "sysfsreader.h"
QT_BEGIN_NAMESPACE_AM
SysFsReader::SysFsReader(const QByteArray &path, int maxRead)
: m_path(path)
{
m_buffer.resize(maxRead);
m_fd.setFileName(QString::fromLocal8Bit(path));
if (!m_fd.open(QIODevice::ReadOnly | QIODevice::Unbuffered)) {
qCritical("Couldn't open file for reading: %s (%s)",
qPrintable(m_fd.fileName()), qPrintable(m_fd.errorString()));
}
}
SysFsReader::~SysFsReader()
{ }
bool SysFsReader::isOpen() const
{
return m_fd.isOpen();
}
QByteArray SysFsReader::fileName() const
{
return m_path;
}
QByteArray SysFsReader::readValue() const
{
if (!m_fd.isOpen())
return QByteArray();
if (!m_fd.seek(0))
return QByteArray();
qsizetype offset = 0;
qsizetype read = 0;
do {
read = m_fd.read(m_buffer.data() + offset, m_buffer.size() - offset);
if (read < 0)
return QByteArray();
else if (read < (m_buffer.size() - offset))
m_buffer[read + offset] = 0;
offset += read;
} while (read > 0 && offset < m_buffer.size());
return m_buffer;
}
QT_END_NAMESPACE_AM
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