1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
18
19*/
20// net.h -- quake's interface to the networking layer
21
22#define	PORT_ANY	-1
23
24typedef struct
25{
26	byte	ip[4];
27	unsigned short	port;
28	unsigned short	pad;
29} netadr_t;
30
31extern	netadr_t	net_local_adr;
32extern	netadr_t	net_from;		// address of who sent the packet
33extern	sizebuf_t	net_message;
34
35extern	cvar_t	hostname;
36
37extern	int		net_socket;
38
39void		NET_Init (int port);
40void		NET_Shutdown (void);
41qboolean	NET_GetPacket (void);
42void		NET_SendPacket (int length, void *data, netadr_t to);
43
44qboolean	NET_CompareAdr (netadr_t a, netadr_t b);
45qboolean	NET_CompareBaseAdr (netadr_t a, netadr_t b);
46char		*NET_AdrToString (netadr_t a);
47char		*NET_BaseAdrToString (netadr_t a);
48qboolean	NET_StringToAdr (char *s, netadr_t *a);
49qboolean NET_IsClientLegal(netadr_t *adr);
50
51//============================================================================
52
53#define	OLD_AVG		0.99		// total = oldtotal*OLD_AVG + new*(1-OLD_AVG)
54
55#define	MAX_LATENT	32
56
57typedef struct
58{
59	qboolean	fatal_error;
60
61	float		last_received;		// for timeouts
62
63// the statistics are cleared at each client begin, because
64// the server connecting process gives a bogus picture of the data
65	float		frame_latency;		// rolling average
66	float		frame_rate;
67
68	int			drop_count;			// dropped packets, cleared each level
69	int			good_count;			// cleared each level
70
71	netadr_t	remote_address;
72	int			qport;
73
74// bandwidth estimator
75	double		cleartime;			// if realtime > nc->cleartime, free to go
76	double		rate;				// seconds / byte
77
78// sequencing variables
79	int			incoming_sequence;
80	int			incoming_acknowledged;
81	int			incoming_reliable_acknowledged;	// single bit
82
83	int			incoming_reliable_sequence;		// single bit, maintained local
84
85	int			outgoing_sequence;
86	int			reliable_sequence;			// single bit
87	int			last_reliable_sequence;		// sequence number of last send
88
89// reliable staging and holding areas
90	sizebuf_t	message;		// writing buffer to send to server
91	byte		message_buf[MAX_MSGLEN];
92
93	int			reliable_length;
94	byte		reliable_buf[MAX_MSGLEN];	// unacked reliable message
95
96// time and size data to calculate bandwidth
97	int			outgoing_size[MAX_LATENT];
98	double		outgoing_time[MAX_LATENT];
99} netchan_t;
100
101extern	int	net_drop;		// packets dropped before this one
102
103void Netchan_Init (void);
104void Netchan_Transmit (netchan_t *chan, int length, byte *data);
105void Netchan_OutOfBand (netadr_t adr, int length, byte *data);
106void Netchan_OutOfBandPrint (netadr_t adr, char *format, ...);
107qboolean Netchan_Process (netchan_t *chan);
108void Netchan_Setup (netchan_t *chan, netadr_t adr, int qport);
109
110qboolean Netchan_CanPacket (netchan_t *chan);
111qboolean Netchan_CanReliable (netchan_t *chan);
112
113