qmqtt_frame.cpp
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/* ****************************************************************************
* Copyright 2019 Open Systems Development BV *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the "Software"), *
* to deal in the Software without restriction, including without limitation *
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
* and/or sell copies of the Software, and to permit persons to whom the *
* Software is furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
* DEALINGS IN THE SOFTWARE. *
* ***************************************************************************/
#include "qmqtt_frame.h"
#include <QLoggingCategory>
#include <QDataStream>
namespace QMQTT {
Q_LOGGING_CATEGORY(frame, "qmqtt.frame")
Frame::Frame()
: _header(0)
, _data(QByteArray())
{
}
Frame::Frame(const quint8 header)
: _header(header)
, _data(QByteArray())
{
}
Frame::Frame(const quint8 header, const QByteArray &data)
: _header(header)
, _data(data)
{
}
Frame::Frame(const Frame& other)
{
_header = other._header;
_data = other._data;
}
Frame& Frame::operator=(const Frame& other)
{
_header = other._header;
_data = other._data;
return *this;
}
bool Frame::operator==(const Frame& other) const
{
return _header == other._header
&& _data == other._data;
}
Frame::~Frame()
{
}
quint8 Frame::header() const
{
return _header;
}
QByteArray Frame::data() const
{
return _data;
}
quint8 Frame::readChar()
{
char c = _data.at(0);
_data.remove(0, 1);
return c;
}
quint16 Frame::readInt()
{
quint8 msb = static_cast<quint8>(_data.at(0));
quint8 lsb = static_cast<quint8>(_data.at(1));
_data.remove(0, 2);
return (msb << 8) | lsb;
}
QByteArray Frame::readByteArray()
{
quint16 len = readInt();
QByteArray data = _data.left(len);
_data.remove(0, len);
return data;
}
QString Frame::readString()
{
quint16 len = readInt();
QString s = QString::fromUtf8(_data.left(len));
_data.remove(0, len);
return s;
}
void Frame::writeInt(const quint16 i)
{
_data.append(MSB(i));
_data.append(LSB(i));
}
void Frame::writeByteArray(const QByteArray &data)
{
if (data.size() > (int)USHRT_MAX)
{
qCritical("qmqtt: Binary data size bigger than %u bytes, truncate it!", USHRT_MAX);
writeInt(USHRT_MAX);
_data.append(data.left(USHRT_MAX));
return;
}
writeInt(data.size());
_data.append(data);
}
void Frame::writeString(const QString &string)
{
QByteArray data = string.toUtf8();
if (data.size() > (int)USHRT_MAX)
{
qCritical("qmqtt: String size bigger than %u bytes, truncate it!", USHRT_MAX);
data.resize(USHRT_MAX);
}
writeInt(data.size());
_data.append(data);
}
void Frame::writeChar(const quint8 c)
{
_data.append(c);
}
void Frame::writeRawData(const QByteArray &data)
{
_data.append(data);
}
void Frame::write(QDataStream &stream) const
{
QByteArray lenbuf;
if (!encodeLength(lenbuf, _data.size()))
{
qCritical("qmqtt: Control packet bigger than 256 MB, dropped!");
return;
}
stream << (quint8)_header;
if(_data.size() == 0) {
stream << (quint8)0;
return;
}
if (stream.writeRawData(lenbuf.data(), lenbuf.size()) != lenbuf.size())
{
qCritical("qmqtt: Control packet write error!");
return;
}
if (stream.writeRawData(_data.data(), _data.size()) != _data.size())
{
qCritical("qmqtt: Control packet write error!");
}
}
bool Frame::encodeLength(QByteArray &lenbuf, int length) const
{
lenbuf.clear();
quint8 d;
do {
d = length % 128;
length /= 128;
if (length > 0) {
d |= 0x80;
}
lenbuf.append(d);
} while (length > 0);
return lenbuf.size() <= 4;
}
} // namespace QMQTT