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/*
Kopete Groupwise Protocol
inputprotocolbase.h - Ancestor of all protocols used for reading GroupWise input
Copyright (c) 2004 SUSE Linux AG http://www.suse.com
Kopete (c) 2002-2004 by the Kopete developers <kopete-devel@kde.org>
*************************************************************************
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Lesser General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
*************************************************************************
*/
#ifndef INPUTPROTOCOLBASE_H
#define INPUTPROTOCOLBASE_H
#include <qobject.h>
class Transfer;
/**
Defines a basic interface for protocols dealing with input from the GroupWise server.
@author Matt Rogers
*/
class InputProtocolBase : public QObject
{
Q_OBJECT
public:
enum EventProtocolState { Success, NeedMore, OutOfSync, ProtocolError };
InputProtocolBase(QObject *parent = 0, const char *name = 0);
~InputProtocolBase();
/**
* Returns a value describing the state of the object.
* If the object is given data to parse that does not begin with a recognised event code,
* it will become OutOfSync, to indicate that the input data probably contains leftover data not processed during a previous parse.
*/
uint state() const;
/**
* Attempt to parse the supplied data into a Transfer object
* @param bytes this will be set to the number of bytes that were successfully parsed. It is no indication of the success of the whole procedure
* @return On success, a Transfer object that the caller is responsible for deleting. It will be either an EventTransfer or a Response, delete as appropriate. On failure, returns 0.
*/
virtual Transfer * parse( const QByteArray &, uint & bytes ) = 0 ;
protected:
/**
* Reads an arbitrary string
* updates the bytes parsed counter
*/
bool readString( QString &message );
/**
* Check that there is data to read, and set the protocol's state if there isn't any.
*/
bool okToProceed();
/**
* read a Q_UINT32 giving the number of following bytes, then a string of that length
* updates the bytes parsed counter
* @return false if the string was broken or there was no data available at all
*/
bool safeReadBytes( QCString & data, uint & len );
protected:
uint m_state;
uint m_bytes;
QDataStream * m_din;
};
#endif
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