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/*
* Copyright (C) 2007-2013 Xagasoft, All rights reserved.
*
* This file is part of the libgats library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef GATS_STREAM_H
#define GATS_STREAM_H
#include <QIODevice>
#include <QByteArray>
namespace Gats
{
class Object;
class GatsStream : public QObject
{
Q_OBJECT;
public:
GatsStream( QIODevice &rStream );
virtual ~GatsStream();
public slots:
/**
* Read an object packet from the assosiated stream. This will make
* every effort to only read exactly enough data to describe one packet,
* in case you want to do other things with your stream. It will
* automatically skip NULL byte spacing between packets, which makes
* a convinient padding method for encrypted data streams. Since
* sizing information is available in the packet header exact amounts
* of data can be read, however this function doesn't assume that it
* can read the entire object in one operation. If it fails to read
* a complete packet in one call, it will keep the data it's read so
* far buffered and return NULL, ready for another attempt. You can
* use the function hasReadBuffer() to deterimne if readObject()
* has read part of an object packet or not. If readObject returns
* non-null then hasReadBuffer should return false on it's next call.
*/
Gats::Object *readObject();
/**
* Works exactly like readObject, except it reads all pending objects
* and emits a objectRead signal for each one read. It doesn't return
* anything. This is perfect for connecting to a QIODevice's readRead
* signal.
*/
void readAllObjects();
public:
/**
* Write an object
*/
void writeObject( Gats::Object *pObject );
/**
* Tells you if there is data still in the read buffer, i.e. that a
* packet is part way through being read. If readObject has returned
* non-null in the most recent call, this should always be false.
*/
bool hasReadBuffer() { return qbRead.size() > 0; }
int getReadBufferSize() { return qbRead.size(); }
QIODevice &getIODevice() { return rStream; }
signals:
void objectRead( Gats::Object *pObj );
private:
bool skipReadNulls();
private:
QIODevice &rStream;
QByteArray qbRead;
};
};
#endif
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