/**************************************************************************************/
/*															Header for Packets.c																	*/
/*												Copyright(C)1999 Peter Armstrong														*/
/*																	Release 2.0																				*/
/**************************************************************************************/


#define		MAX_PKTS_16			16			/* max number of packets stored */
#define		MAX_PKT_DATA		6				/* max number of data bytes that can be sent/received */
 

/* PC's packet transfer mode type */
#define		P_TFR_REAL			0				/* transfer packets with remote psx */
#define		P_TFR_TEST			1				/* test transfers to PC and back */

/* packet types */
#define		PSX_OK					0
#define		PSX_NG					1
#define		PSX_END					2

/* array indexes for general packet information (link.info[])*/
#define		L_STORED				0		/* last local frame stored */
#define		L_SENT					1		/* last local frame sent */
#define		L_STORED_NUM		2		/* number of local packets stored for sending */
#define		L_OUT						3		/* set if psx sending a packet */
#define		R_STORED				4		/* frame number of last remote packet received */
#define		R_STORED_NUM		5		/* number of remote packets received */
#define		ERROR_PKT				6		/* last data packet sent before er_packet sent */
#define		ERROR_AWAIT			7		/* waiting for pkt re-send */
#define		END_PKT					8		/* last data packet sent before end transfer packet */
#define		END_AWAIT				9		/* waiting for remote psx to send end packet */
#define		LAST_STATUS			10	/* status of this/last packet */
#define		FRAME						11	/* frame number of next local/remote data to send to app */

#define		INFO_SIZE		12

/* structure of link/transfer info */ 
struct link_info
{
	volatile struct	cmds cmd_info;				/* psx command structure */
	int			ping;									/* connect type */
	int			connected;						/* connect status */								
	int			lk_type;							/* link connection type */
	int			m_state;							/* master/slave status */
	int			max_diff;							/* max local/remote frame difference */
	u_char	*loc_data;						/* ptr to local data  */
	u_char	*rem_data;						/* ptr to remote data */
	int			end_tfr;							/* end packet transfer session */
	int			loc_status;						/* local psx status */
	int			rem_status;						/* remote psx status */
	u_char	info[INFO_SIZE];			/* array keeping track of packet transfers */	
};

/* defines for above struct */

/* lk_type */
#define	LK_PSX				0										/* psx<->psx */
#define	LK_PC					1										/* psx<->pc<->psx */
#define LK_MODEM			2										/* psx<->pc<->pc<->psx */

/* m_state */
#define	SLAVE					2										/* slave playstation */
#define MASTER				3										/* master playstation */

/* frame difference */
#define	MAXD_PSX			2										/* difference between psxs no greater than 2 */
#define	MAXD_PC				2
#define	MAXD_MODEM		4										/* no greater than 4 */

/* loc_status values on return from pkt_connect() */
#define	I_CONNECTED		1											/* connection made */
#define	I_USER_INT		0											/* user interrupt */
#define	I_CNT_FAIL	 -1											/* failed to connect */

/* defines for loc/rem_status in tfr mode */
#define		TFR_OK				0							/*	no connection or transfer problems */
#define		TFR_END			 -1							/*	local or remote has ended transfer */
#define		TFR_TIMEOUT	 -2							/*	loss of connection to remote psx */

/* return values for pkt_start() */
#define		S_READY						1				/* transfer session has started */
#define		S_NOT_CONNECTED		0				/* not connected */
#define		S_START_FAIL		 -1			  /* transfer could not be started */
#define		S_BAD_SIZE			 -2	 			/* data size out of range */
#define		S_MEM_FAIL			 -3				/* malloc() failure */

/* return values for pkt_transfer() */
#define		T_DATA_AVAIL			1				/* local/remote data available for next frame */
#define		T_NO_DATA					0				/* no data available */
#define		T_TFR_ENDED			 -1				/* remote has ended transfer session */
#define		T_TIMEOUT				 -2				/* remote psx no longer sending packets */


/* prototypes */
struct	link_info	*link_connect(volatile char *padbuf);
void		link_disconnect(void);
int			pkt_start(u_int size,int mode);
int			Cmd_Start(u_int size, int mode, int	diff);
int			Pkt_Alloc(void);
void		Pkt_Free(void);
void		pkt_end(void);
int			pkt_transfer(u_char *data_p);
void		Store_Packet(u_char *data_p);
void		Next_Packet(void);
int			Check_Diff(void);
void		In_Error_Set(void);
void		Packet_Transfers(void);
int			Send_Rec_Packets(void);
int			Next_Frame_Data(void);
int			Pkt_Read(char *read_p, int to_read);