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/*
* qmqtt_frame.cpp - qmqtt frame
*
* Copyright (c) 2013 Ery Lee <ery.lee at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of mqttc nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#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
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