server/include/client.h

/*
 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Crossfire TRT is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <crossfire@schmorp.de>
 */

#ifndef CLIENT_H
#define CLIENT_H

#include <deque>
#include <bitset>
#include <tr1/unordered_set>

// (possibly) max. number of objects "per page" in the ground container
#define FLOORBOX_PAGESIZE 50

struct MapCell
{
  tag_t player;                 // this is, unfortunately, very wasteful of memory space, but pretty bandwidth-efficient
  int count;                   /* This is really darkness in the map1 command */
  faceidx faces[MAP_LAYERS];
  unsigned char stat_hp;       // health of something in this space, or 0
  unsigned char flags;
  uint8_t smooth[MAP_LAYERS];
};

#define MAX_CLIENT_X MAP_CLIENT_X
#define MAX_CLIENT_Y MAP_CLIENT_Y

struct Map
{
  struct MapCell cells[MAX_CLIENT_X][MAX_CLIENT_Y];
};

/* True max is 16383 given current map compaction method */
#define MAXANIMNUM  10000

struct statsinfo
{
  char *range, *title;
};

/* This contains basic information on the socket structure.  status is its
 * current state.  we set up our on buffers for sending/receiving, so we can
 * handle some higher level functions.  fd is the actual file descriptor we
 * are using.
 */

/* Only one map mode can actually be used, so lets make it a switch
 * instead of having a bunch of different fields that needed to
 * get toggled.
 */
enum { Map0Cmd = 0, Map1Cmd = 1, Map1aCmd = 2 };

// states the socket can be in
enum {
 ST_DEAD,     // socket is dead
 ST_SETUP,    // initial handshake / setup / login
 ST_PLAYING,  // logged in an playing
 ST_CUSTOM,   // waiting for custom reply

 ST_GET_PARTY_PASSWORD,
};

// a handler for a specific type of packet
enum {
  PF_PLAYER   = 0x01, // must have valid player / will by synchronised
  PF_PLAYING  = 0x02, // must be in playing state
  PF_COMMAND0 = 0x04, // command starts at offset 0
  PF_COMMAND6 = 0x08, // command starts at offset 6
};

struct packet_type
{
  const char *name;
  void *cb;
  int flags;
};

struct command
{
  tstamp stamp;
  const packet_type *handler;
  char *data;
  int datalen;

  ~command ()
  {
    sfree<char> (data, datalen + 1);
  }
};

/* how many times we are allowed to give the wrong password before being kicked. */
#define MAX_PASSWORD_FAILURES 5

INTERFACE_CLASS (client) // should become player when newsocket is a baseclass of player
struct client : zero_initialised, attachable
{
  int ACC (RW, fd);
  unsigned int inbuf_len;                 // number of bytes valid in inbuf
  statsinfo stats;
  object_vector_index ACC (RO, active);
  player_ptr ACC (RO, pl);

  /* The following is the setup for a ring buffer for storing output
   * data that the OS can't handle right away.
   */
  struct
  {
    char data[SOCKETBUFSIZE];
    int start;
    int len;
  } outputbuffer;

  char *ACC (RW, host);                   /* Which host it is connected from (ip address) */
  uint8 ACC (RW, state);                  /* Input state of the player (name, password, etc */

  sint8 ACC (RW, last_level);             /* Last level we sent to client */
  uint16 ACC (RW, last_flags);            /* fire/run on flags for last tick */
  float ACC (RW, last_weapon_sp);         /* if diff than weapon_sp, update client */
  sint32 ACC (RW, last_weight);           /* Last weight as sent to client; -1 means do not send weight */
  sint32 ACC (RW, last_weight_limit);     /* Last weight limit transmitted to client */
  uint32 ACC (RW, last_path_attuned);     /* Last spell attunment sent to client */
  uint32 ACC (RW, last_path_repelled);    /* Last spell repelled sent to client */
  uint32 ACC (RW, last_path_denied);      /* Last spell denied sent to client */
  living ACC (RO, last_stats);            /* Last stats as sent to client */
  float ACC (RW, last_speed);             /* Last speed as sent to client */
  sint16 ACC (RW, last_resist[NROFATTACKS]);/* last resist values sent to client */
  sint64 ACC (RW, last_skill_exp[NUM_SKILLS]);/* shadow register. if != exp. obj update client */

  bool ACC (RW, force_face0);             // client workaround for buggy checksum calculation in gcfclient
  bool ACC (RW, force_bad_checksum);      // client workaround for buggy checksum calculation in gcfclient
  bool ACC (RW, force_image_newmap);      // client workaround for client not redrawing map on image upload
  bool ACC (RW, enable_bg_scrub);         // client workaround, gcfclient becomes unusable if you send it images

  bool ACC (RW, afk);                     /* player is afk */
  bool ACC (RW, facecache);               /* If true, client is caching images */
  bool ACC (RW, sent_scroll);             
  bool ACC (RW, sound);                   /* does the client want sound */
  bool ACC (RW, newmapcmd);               /* Send newmap command when entering new map SMACFIGGEN */
  bool ACC (RW, plugincmd);               // extend the protocol through a plug-in */
  bool ACC (RW, mapinfocmd);              // return map info and send map change info
  uint8_t ACC (RW, extcmd);                  // call into extensions/plugins
  bool ACC (RW, extmap);                  // extend map comamnd with extra data
  bool ACC (RW, buggy_mapscroll);         // client crashes on large mapscrolls
  bool ACC (RW, darkness);                /* True if client wants darkness information */
  bool ACC (RW, image2);                  /* Client wants image2/face2 commands */
  uint8_t ACC (RW, fxix);                 // client implements fx and ix (face|image extended) commands
  bool ACC (RW, update_look);             /* If true, we need to send the look window */
  bool ACC (RW, has_readable_type);       /* If true client accept additional text information */
                                          /* used to arrange text in books, scrolls, or scripted dialogs */
  bool ACC (RW, monitor_spells);          /* Client wishes to be informed when their spell list changes */
  bool ACC (RW, ext_mapinfos);            /* If true client accepts additional info on maps */
                                          /* Below are flags for extedend infos to pass to client 
                                           * with S->C mapextended command */
  bool ACC (RW, EMI_smooth);              /* Send smooth in extendmapinfos */
  bool ACC (RW, smoothing);               // trt-style smoothing
  bool ACC (RW, can_msg);                 // trt-style text messages

  bool ACC (RW, force_newmap);            // force a newmap before next map update
  uint32 ACC (RW, supported_readables);   /* each bit is a readable supported by client */
  uint32 ACC (RW, cs_version), ACC (RW, sc_version);        /* versions of the client */
  uint16 ACC (RW, look_position);         /* start of drawing of look window */
  uint16 ACC (RW, mss);                   // likely tcp maximum segment size
  uint8 ACC (RW, mapmode);                /* Type of map commands the client wants. */
  uint8 ACC (RW, mapx), ACC (RW, mapy);             /* How large a map the client wants */
  uint8 ACC (RW, itemcmd);                /* What version of the 'item' protocol command to use */

  maptile *ACC (RW, current_map);         // CF+ last/current player map
  region *ACC (RW, current_region);       // CF+ last/current player region
  int ACC (RW, current_x), ACC (RW, current_y);     // CF+ last/current map position
  shstr ACC (RW, version);                // CF+ client name/version
  uint8 ACC (RW, faceset);                // CF+ selected faceset

  tstamp ACC (RW, last_send);             // last data send on socket.

  int ACC (RW, rtt), ACC (RW, rttvar);    /* round-trip time and -variance, if known */
  int ACC (RW, outq);                     // current socket outq length, or 0 if indeterminable

  int ACC (RW, rate_avail);               // current rate balance
  int ACC (RW, max_rate);                 // max. # of bytes to send per tick
  faceidx ACC (RW, scrub_idx);            // which face to send next
  int ACC (RW, bg_scrub);                 // how many ticks till the next background face send

  struct ixsend {
    int16_t pri; // unused
    faceidx idx;
    uint32_t ofs;  // if != 0, need to send remaining bytes of partial_face
  };
  std::vector<ixsend, slice_allocator<ixsend> > ixface; // which faces to send to the client using ix

  std::vector<faceidx, slice_allocator<faceidx> > fxface; // which faces to send using fx
  MTH void flush_fx (); // send fx if required

  void do_destroy ();
  void gather_callbacks (AV *&callbacks, event_type event) const;

  iow socket_ev; void socket_cb (iow &w, int got);
  iw  cmd_ev;    void cmd_cb (iw &w);

  std::deque< command, slice_allocator<command> > cmd_queue;

  // large structures at the end please
  struct Map lastmap;
  std::bitset<MAXANIMNUM> anims_sent;
  std::bitset<MAX_FACES> faces_sent;

  // if we get an incomplete packet, this is used to hold the data.
  // we add 2 byte for the header, one for the trailing 0 byte
  uint8 inbuf[MAXSOCKBUF + 2 + 1];

  enum { MSG_BUF_SIZE = 80, MSG_BUF_COUNT = 10 };
  struct msg_buf
  {
    tick_t expire;
    int len;
    int count;
    char msg[MSG_BUF_SIZE];
  } msgbuf[MSG_BUF_COUNT];

  MTH bool msg_suppressed (const char *msg);

  bool may_execute (const packet_type *pkt) const;
  void execute (const packet_type *pkt, char *data, int datalen);

  void queue_command (packet_type *handler, char *data, int datalen);
  MTH bool handle_command ();
  // resets movement state
  MTH void reset_state ();
  // resets variable data used to send stat diffs
  MTH void reset_stats ();

  MTH bool handle_packet ();
  int next_packet ();                     // returns length of packet or 0
  void skip_packet (int len);             // we have processed the packet, skip it

  MTH void flush ();
  MTH void write_outputbuffer ();
  MTH int outputbuffer_len () const { return outputbuffer.len; }
  void send (void *buf_, int len);

  void send_packet (const char *buf);
  void send_packet (const char *buf, int len);
  void send_packet_printf (const char *format, ...);
  void send_packet (packet &sl);

  void send_drawinfo (const char *msg, int flags = NDI_BLACK);

  MTH bool must_send_face (faceidx facenum)
  {
    if (faces_sent[facenum])
      return false;

    faces_sent[facenum] = true;
    return true;
  }

  MTH void send_face (faceidx facenum);
  MTH void send_image (faceidx facenum);
  MTH void send_faces (object *ob);
  MTH void send_animation (short anim_num);
  void send_msg (int color, const char *type, const char *msg);

  // called when something under the player changes
  MTH void floorbox_update () { update_look = 1; }
  // called when the player has been moved
  MTH void floorbox_reset  () { look_position = 0; floorbox_update (); }

  MTH void tick (); // called every server tick to do housekeeping etc.

  MTH static client *create (int fd, const char *peername);

protected:
  client (int fd, const char *from_ip);
  ~client ();
};

#define CLIENT_SUPPORT_READABLES(__sockPtr,__type)\
        ( ((__type)>0) &&\
          ((__sockPtr)->has_readable_type) && \
          ((__sockPtr)->supported_readables & (1<<(__type))) )

/* Constants in the form EMI_ is for extended map infos.
 * Even if the client select the additionnal infos it wants
 * on the map, there may exist cases where this whole info
 * is not given in one buch but in separate bunches. This 
 * is done performance reasons (imagine some info related to
 * a visible object and another info related to a 4 square
 * width and height area). At the begin of an extended info packet
 * is a bit field. A bit is activated for each extended info
 * present in the data 
 */

/* Meanings:
 * EMI_NOREDRAW  Take extended infos into account but don't redraw,
 *               some additionnal datas will follow in a new packet
 * EMI_SMOOTH    Datas about smoothing  
 */
#define EMI_NOREDRAW        0x01
#define EMI_SMOOTH          0x02

/* this last one says the bitfield continue un next byte
 * There may be several on contiguous bytes. So there is 7
 * actual bits used per byte, and the number of bytes
 * is not fixed in protocol
 */
#define EMI_HASMOREBITS     0x80

#define FACE_TYPES  1
#define PNG_FACE_INDEX  0

#define VERSION_CS 1023        /* version >= 1023 understand setup cmd */
#define VERSION_SC 1026
//#define VERSION_SC 1027 // requestinfo image_info and image_sums, makes extending faces on the fly impossible
#define VERSION_INFO "Crossfire TRT Server"

typedef object_vector<client, &client::active> sockvec;

extern sockvec clients;

#define for_all_clients(var)                    \
  for (int _i = 0; _i < clients.size (); ++_i)  \
    statementvar (client *, var, clients [_i])

#endif

Revision:	1.62
Committed:	Mon Jul 23 21:02:50 2007 UTC (16 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.61:	+1 -1 lines
Log Message:	- new extcmd version, much streamlined - new npc dialogue protocol - older cfplus clients are supported, without cfplus_support (no dialogue), for some time. - improved worldmap support.
#	Content
1	/*
2	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3	*
4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992,2007 Frank Tore Johansen
7	*
8	* Crossfire TRT is free software: you can redistribute it and/or modify
9	* it under the terms of the GNU General Public License as published by
10	* the Free Software Foundation, either version 3 of the License, or
11	* (at your option) any later version.
12	*
13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.
17	*
18	* You should have received a copy of the GNU General Public License
19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
20	*
21	* The authors can be reached via e-mail to <crossfire@schmorp.de>
22	*/
23
24	#ifndef CLIENT_H
25	#define CLIENT_H
26
27	#include <deque>
28	#include <bitset>
29	#include <tr1/unordered_set>
30
31	// (possibly) max. number of objects "per page" in the ground container
32	#define FLOORBOX_PAGESIZE 50
33
34	struct MapCell
35	{
36	tag_t player; // this is, unfortunately, very wasteful of memory space, but pretty bandwidth-efficient
37	int count; /* This is really darkness in the map1 command */
38	faceidx faces[MAP_LAYERS];
39	unsigned char stat_hp; // health of something in this space, or 0
40	unsigned char flags;
41	uint8_t smooth[MAP_LAYERS];
42	};
43
44	#define MAX_CLIENT_X MAP_CLIENT_X
45	#define MAX_CLIENT_Y MAP_CLIENT_Y
46
47	struct Map
48	{
49	struct MapCell cells[MAX_CLIENT_X][MAX_CLIENT_Y];
50	};
51
52	/* True max is 16383 given current map compaction method */
53	#define MAXANIMNUM 10000
54
55	struct statsinfo
56	{
57	char range, title;
58	};
59
60	/* This contains basic information on the socket structure. status is its
61	* current state. we set up our on buffers for sending/receiving, so we can
62	* handle some higher level functions. fd is the actual file descriptor we
63	* are using.
64	*/
65
66	/* Only one map mode can actually be used, so lets make it a switch
67	* instead of having a bunch of different fields that needed to
68	* get toggled.
69	*/
70	enum { Map0Cmd = 0, Map1Cmd = 1, Map1aCmd = 2 };
71
72	// states the socket can be in
73	enum {
74	ST_DEAD, // socket is dead
75	ST_SETUP, // initial handshake / setup / login
76	ST_PLAYING, // logged in an playing
77	ST_CUSTOM, // waiting for custom reply
78
79	ST_GET_PARTY_PASSWORD,
80	};
81
82	// a handler for a specific type of packet
83	enum {
84	PF_PLAYER = 0x01, // must have valid player / will by synchronised
85	PF_PLAYING = 0x02, // must be in playing state
86	PF_COMMAND0 = 0x04, // command starts at offset 0
87	PF_COMMAND6 = 0x08, // command starts at offset 6
88	};
89
90	struct packet_type
91	{
92	const char *name;
93	void *cb;
94	int flags;
95	};
96
97	struct command
98	{
99	tstamp stamp;
100	const packet_type *handler;
101	char *data;
102	int datalen;
103
104	~command ()
105	{
106	sfree<char> (data, datalen + 1);
107	}
108	};
109
110	/* how many times we are allowed to give the wrong password before being kicked. */
111	#define MAX_PASSWORD_FAILURES 5
112
113	INTERFACE_CLASS (client) // should become player when newsocket is a baseclass of player
114	struct client : zero_initialised, attachable
115	{
116	int ACC (RW, fd);
117	unsigned int inbuf_len; // number of bytes valid in inbuf
118	statsinfo stats;
119	object_vector_index ACC (RO, active);
120	player_ptr ACC (RO, pl);
121
122	/* The following is the setup for a ring buffer for storing output
123	* data that the OS can't handle right away.
124	*/
125	struct
126	{
127	char data[SOCKETBUFSIZE];
128	int start;
129	int len;
130	} outputbuffer;
131
132	char ACC (RW, host); / Which host it is connected from (ip address) */
133	uint8 ACC (RW, state); /* Input state of the player (name, password, etc */
134
135	sint8 ACC (RW, last_level); /* Last level we sent to client */
136	uint16 ACC (RW, last_flags); /* fire/run on flags for last tick */
137	float ACC (RW, last_weapon_sp); /* if diff than weapon_sp, update client */
138	sint32 ACC (RW, last_weight); /* Last weight as sent to client; -1 means do not send weight */
139	sint32 ACC (RW, last_weight_limit); /* Last weight limit transmitted to client */
140	uint32 ACC (RW, last_path_attuned); /* Last spell attunment sent to client */
141	uint32 ACC (RW, last_path_repelled); /* Last spell repelled sent to client */
142	uint32 ACC (RW, last_path_denied); /* Last spell denied sent to client */
143	living ACC (RO, last_stats); /* Last stats as sent to client */
144	float ACC (RW, last_speed); /* Last speed as sent to client */
145	sint16 ACC (RW, last_resist[NROFATTACKS]);/* last resist values sent to client */
146	sint64 ACC (RW, last_skill_exp[NUM_SKILLS]);/* shadow register. if != exp. obj update client */
147
148	bool ACC (RW, force_face0); // client workaround for buggy checksum calculation in gcfclient
149	bool ACC (RW, force_bad_checksum); // client workaround for buggy checksum calculation in gcfclient
150	bool ACC (RW, force_image_newmap); // client workaround for client not redrawing map on image upload
151	bool ACC (RW, enable_bg_scrub); // client workaround, gcfclient becomes unusable if you send it images
152
153	bool ACC (RW, afk); /* player is afk */
154	bool ACC (RW, facecache); /* If true, client is caching images */
155	bool ACC (RW, sent_scroll);
156	bool ACC (RW, sound); /* does the client want sound */
157	bool ACC (RW, newmapcmd); /* Send newmap command when entering new map SMACFIGGEN */
158	bool ACC (RW, plugincmd); // extend the protocol through a plug-in */
159	bool ACC (RW, mapinfocmd); // return map info and send map change info
160	uint8_t ACC (RW, extcmd); // call into extensions/plugins
161	bool ACC (RW, extmap); // extend map comamnd with extra data
162	bool ACC (RW, buggy_mapscroll); // client crashes on large mapscrolls
163	bool ACC (RW, darkness); /* True if client wants darkness information */
164	bool ACC (RW, image2); /* Client wants image2/face2 commands */
165	uint8_t ACC (RW, fxix); // client implements fx and ix (face\|image extended) commands
166	bool ACC (RW, update_look); /* If true, we need to send the look window */
167	bool ACC (RW, has_readable_type); /* If true client accept additional text information */
168	/* used to arrange text in books, scrolls, or scripted dialogs */
169	bool ACC (RW, monitor_spells); /* Client wishes to be informed when their spell list changes */
170	bool ACC (RW, ext_mapinfos); /* If true client accepts additional info on maps */
171	/* Below are flags for extedend infos to pass to client
172	* with S->C mapextended command */
173	bool ACC (RW, EMI_smooth); /* Send smooth in extendmapinfos */
174	bool ACC (RW, smoothing); // trt-style smoothing
175	bool ACC (RW, can_msg); // trt-style text messages
176
177	bool ACC (RW, force_newmap); // force a newmap before next map update
178	uint32 ACC (RW, supported_readables); /* each bit is a readable supported by client */
179	uint32 ACC (RW, cs_version), ACC (RW, sc_version); /* versions of the client */
180	uint16 ACC (RW, look_position); /* start of drawing of look window */
181	uint16 ACC (RW, mss); // likely tcp maximum segment size
182	uint8 ACC (RW, mapmode); /* Type of map commands the client wants. */
183	uint8 ACC (RW, mapx), ACC (RW, mapy); /* How large a map the client wants */
184	uint8 ACC (RW, itemcmd); /* What version of the 'item' protocol command to use */
185
186	maptile *ACC (RW, current_map); // CF+ last/current player map
187	region *ACC (RW, current_region); // CF+ last/current player region
188	int ACC (RW, current_x), ACC (RW, current_y); // CF+ last/current map position
189	shstr ACC (RW, version); // CF+ client name/version
190	uint8 ACC (RW, faceset); // CF+ selected faceset
191
192	tstamp ACC (RW, last_send); // last data send on socket.
193
194	int ACC (RW, rtt), ACC (RW, rttvar); /* round-trip time and -variance, if known */
195	int ACC (RW, outq); // current socket outq length, or 0 if indeterminable
196
197	int ACC (RW, rate_avail); // current rate balance
198	int ACC (RW, max_rate); // max. # of bytes to send per tick
199	faceidx ACC (RW, scrub_idx); // which face to send next
200	int ACC (RW, bg_scrub); // how many ticks till the next background face send
201
202	struct ixsend {
203	int16_t pri; // unused
204	faceidx idx;
205	uint32_t ofs; // if != 0, need to send remaining bytes of partial_face
206	};
207	std::vector<ixsend, slice_allocator<ixsend> > ixface; // which faces to send to the client using ix
208
209	std::vector<faceidx, slice_allocator<faceidx> > fxface; // which faces to send using fx
210	MTH void flush_fx (); // send fx if required
211
212	void do_destroy ();
213	void gather_callbacks (AV *&callbacks, event_type event) const;
214
215	iow socket_ev; void socket_cb (iow &w, int got);
216	iw cmd_ev; void cmd_cb (iw &w);
217
218	std::deque< command, slice_allocator<command> > cmd_queue;
219
220	// large structures at the end please
221	struct Map lastmap;
222	std::bitset<MAXANIMNUM> anims_sent;
223	std::bitset<MAX_FACES> faces_sent;
224
225	// if we get an incomplete packet, this is used to hold the data.
226	// we add 2 byte for the header, one for the trailing 0 byte
227	uint8 inbuf[MAXSOCKBUF + 2 + 1];
228
229	enum { MSG_BUF_SIZE = 80, MSG_BUF_COUNT = 10 };
230	struct msg_buf
231	{
232	tick_t expire;
233	int len;
234	int count;
235	char msg[MSG_BUF_SIZE];
236	} msgbuf[MSG_BUF_COUNT];
237
238	MTH bool msg_suppressed (const char *msg);
239
240	bool may_execute (const packet_type *pkt) const;
241	void execute (const packet_type pkt, char data, int datalen);
242
243	void queue_command (packet_type handler, char data, int datalen);
244	MTH bool handle_command ();
245	// resets movement state
246	MTH void reset_state ();
247	// resets variable data used to send stat diffs
248	MTH void reset_stats ();
249
250	MTH bool handle_packet ();
251	int next_packet (); // returns length of packet or 0
252	void skip_packet (int len); // we have processed the packet, skip it
253
254	MTH void flush ();
255	MTH void write_outputbuffer ();
256	MTH int outputbuffer_len () const { return outputbuffer.len; }
257	void send (void *buf_, int len);
258
259	void send_packet (const char *buf);
260	void send_packet (const char *buf, int len);
261	void send_packet_printf (const char *format, ...);
262	void send_packet (packet &sl);
263
264	void send_drawinfo (const char *msg, int flags = NDI_BLACK);
265
266	MTH bool must_send_face (faceidx facenum)
267	{
268	if (faces_sent[facenum])
269	return false;
270
271	faces_sent[facenum] = true;
272	return true;
273	}
274
275	MTH void send_face (faceidx facenum);
276	MTH void send_image (faceidx facenum);
277	MTH void send_faces (object *ob);
278	MTH void send_animation (short anim_num);
279	void send_msg (int color, const char type, const char msg);
280
281	// called when something under the player changes
282	MTH void floorbox_update () { update_look = 1; }
283	// called when the player has been moved
284	MTH void floorbox_reset () { look_position = 0; floorbox_update (); }
285
286	MTH void tick (); // called every server tick to do housekeeping etc.
287
288	MTH static client create (int fd, const char peername);
289
290	protected:
291	client (int fd, const char *from_ip);
292	~client ();
293	};
294
295	#define CLIENT_SUPPORT_READABLES(__sockPtr,__type)\
296	( ((__type)>0) &&\
297	((__sockPtr)->has_readable_type) && \
298	((__sockPtr)->supported_readables & (1<<(__type))) )
299
300	/* Constants in the form EMI_ is for extended map infos.
301	* Even if the client select the additionnal infos it wants
302	* on the map, there may exist cases where this whole info
303	* is not given in one buch but in separate bunches. This
304	* is done performance reasons (imagine some info related to
305	* a visible object and another info related to a 4 square
306	* width and height area). At the begin of an extended info packet
307	* is a bit field. A bit is activated for each extended info
308	* present in the data
309	*/
310
311	/* Meanings:
312	* EMI_NOREDRAW Take extended infos into account but don't redraw,
313	* some additionnal datas will follow in a new packet
314	* EMI_SMOOTH Datas about smoothing
315	*/
316	#define EMI_NOREDRAW 0x01
317	#define EMI_SMOOTH 0x02
318
319	/* this last one says the bitfield continue un next byte
320	* There may be several on contiguous bytes. So there is 7
321	* actual bits used per byte, and the number of bytes
322	* is not fixed in protocol
323	*/
324	#define EMI_HASMOREBITS 0x80
325
326	#define FACE_TYPES 1
327	#define PNG_FACE_INDEX 0
328
329	#define VERSION_CS 1023 /* version >= 1023 understand setup cmd */
330	#define VERSION_SC 1026
331	//#define VERSION_SC 1027 // requestinfo image_info and image_sums, makes extending faces on the fly impossible
332	#define VERSION_INFO "Crossfire TRT Server"
333
334	typedef object_vector<client, &client::active> sockvec;
335
336	extern sockvec clients;
337
338	#define for_all_clients(var) \
339	for (int _i = 0; _i < clients.size (); ++_i) \
340	statementvar (client *, var, clients [_i])
341
342	#endif
343