/*
 *	The Unix Channel
 *
 *	by Michel Beaudouin-Lafon
 *
 *	Copyright 1990-1993
 *	Laboratoire de Recherche en Informatique (LRI)
 *
 *	UchMessage streams
 *
 *	$Id$
 *	$CurLog$
 */

#ifndef MsgStream_H_
#define MsgStream_H_

#include "Stream.h"
#include "ccu/SmartPointer.h"
#include "MsgBuffer.h"
class UchMessage;

class UchMsgStream : public UchStream {
private:
	
protected:
	UchMsgBuffer		InBuffer;
	int		InSize;
	UchMsgBuffer		OutBuffer;
	int		OutSize;
enum	STATE		{ WAITING, GOT_TYPE, GOT_LENGTH, DONE};
enum	TYPE		{ MSG = 1, ASK, ANS, SYNC, ASYNC, OK };
	STATE		State;
	bool		BufferedMessages;
	UchMsgBuffer		Buffered;
	bool		WaitingForAnswer;
	bool		WaitingReply;
	int		InLength;
	byte		InType;
	bool		Sync;

	void		ProcessInput (UchMsgBuffer&, bool);
	int		ReadInput ();
public:
	UchMsgStream ();
	UchMsgStream (const UchMsgStream&);
	UchMsgStream (UchAddress*, UchAddress*);
	~UchMsgStream ();

	void		InputBuffer (int min, int grow, int max);
	void		OutputBuffer (int min, int grow, int max);
inline	void		FlushSize (int n)		{ OutSize = n; }
	UchChannel*	Copy () const;
	void		HandleRead ();
	void		HandleWrite ();
	bool		HandleSelect ();
inline	bool		GetSyncMode ()		{ return Sync; }
inline	void		SetSyncMode (bool s)	{ Sync = s; Flush (); }
virtual	bool		NewMessage (UchMsgBuffer&, bool);
virtual	void*		ConvertAnswer (UchMsgBuffer&);
virtual	void		Delete ();
	void		Send (UchMessage&, bool = FALSE);
	void*		Ask (UchMessage&);
	void		Reply (UchMessage&);
	void		Flush ();
	void		Send (UchMsgBuffer&, bool = FALSE);
};

#endif /* MsgStream_H_ */