server/include/network.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>
 */

/* This file defines various flags that both the new client and
 * newserver uses.  These should never be changed, only expanded.
 * Changing them will likely cause all old clients to not work properly.
 * While called newclient, it is really used by both the client and
 * server to keep some values the same.
 *
 * Name format is CS_(command)_(flag)
 * CS = Client/Server.
 * (command) is protocol command, ie ITEM
 * (flag) is the flag name
 */

/* It is trivial to keep a link of copy of this file in the client
 * or server area.  But keeping one common file should make things
 * more reliable, as both the client and server will definately be
 * talking about the same values.
 */


#ifndef NETWORK_H
#define NETWORK_H

#include <cstdarg>

/* Maximum size of any packet we expect.
 *
 * The size must be the same in the server and the client (stupid), and its also NOT
 * the maximum buffer size as one would expect, but the maximum buffer size + 1.
 */
#define MAXSOCKBUF 10240

#define CS_QUERY_YESNO  0x1     /* Yes/no question */
#define CS_QUERY_SINGLECHAR 0x2 /* Single character response expected */
#define CS_QUERY_HIDEINPUT 0x4  /* Hide input being entered */

/* These are multiplication values that should be used when changing 
 * floats to ints, and vice version.  MULTI is integer representatin
 * (float to int), MULTF is float, for going from int to float.
 */
#define FLOAT_MULTI     100000
#define FLOAT_MULTF     100000.0

/* ID's for the various stats that get sent across. */

#define CS_STAT_HP       1
#define CS_STAT_MAXHP    2
#define CS_STAT_SP       3
#define CS_STAT_MAXSP    4
#define CS_STAT_STR      5
#define CS_STAT_INT      6
#define CS_STAT_WIS      7
#define CS_STAT_DEX      8
#define CS_STAT_CON      9
#define CS_STAT_CHA     10
#define CS_STAT_EXP     11
#define CS_STAT_LEVEL   12
#define CS_STAT_WC      13
#define CS_STAT_AC      14
#define CS_STAT_DAM     15
#define CS_STAT_ARMOUR  16
#define CS_STAT_SPEED   17
#define CS_STAT_FOOD    18
#define CS_STAT_WEAP_SP 19
#define CS_STAT_RANGE   20
#define CS_STAT_TITLE   21
#define CS_STAT_POW     22
#define CS_STAT_GRACE   23
#define CS_STAT_MAXGRACE        24
#define CS_STAT_FLAGS   25
#define CS_STAT_WEIGHT_LIM      26
#define CS_STAT_EXP64   28
#define CS_STAT_SPELL_ATTUNE    29
#define CS_STAT_SPELL_REPEL     30
#define CS_STAT_SPELL_DENY      31

/* Start & end of resistances, inclusive. */
#define CS_STAT_RESIST_START    100
#define CS_STAT_RESIST_END      117
#define CS_STAT_RES_PHYS        100
#define CS_STAT_RES_MAG         101
#define CS_STAT_RES_FIRE        102
#define CS_STAT_RES_ELEC        103
#define CS_STAT_RES_COLD        104
#define CS_STAT_RES_CONF        105
#define CS_STAT_RES_ACID        106
#define CS_STAT_RES_DRAIN       107
#define CS_STAT_RES_GHOSTHIT    108
#define CS_STAT_RES_POISON      109
#define CS_STAT_RES_SLOW        110
#define CS_STAT_RES_PARA        111
#define CS_STAT_TURN_UNDEAD     112
#define CS_STAT_RES_FEAR        113
#define CS_STAT_RES_DEPLETE     114
#define CS_STAT_RES_DEATH       115
#define CS_STAT_RES_HOLYWORD    116
#define CS_STAT_RES_BLIND       117

/* Start & end of skill experience + skill level, inclusive. */
#define CS_STAT_SKILLEXP_START 118
#define CS_STAT_SKILLEXP_END 129
#define CS_STAT_SKILLEXP_AGILITY 118
#define CS_STAT_SKILLEXP_AGLEVEL 119
#define CS_STAT_SKILLEXP_PERSONAL 120
#define CS_STAT_SKILLEXP_PELEVEL 121
#define CS_STAT_SKILLEXP_MENTAL 122
#define CS_STAT_SKILLEXP_MELEVEL 123
#define CS_STAT_SKILLEXP_PHYSIQUE 124
#define CS_STAT_SKILLEXP_PHLEVEL 125
#define CS_STAT_SKILLEXP_MAGIC 126
#define CS_STAT_SKILLEXP_MALEVEL 127
#define CS_STAT_SKILLEXP_WISDOM 128
#define CS_STAT_SKILLEXP_WILEVEL 129

/* CS_STAT_SKILLINFO is used as the starting index point.  Skill number->name
 * map is generated dynamically for the client, so a bunch of entries will
 * be used here.  CS_NUM_SKILLS does not match how many skills there really
 * are - instead, it is used as a range of values so that the client
 * can have some idea how many skill categories there may be.
 */
#define CS_STAT_SKILLINFO   140
#define CS_NUM_SKILLS        50

/* These are used with CS_STAT_FLAGS above to communicate S->C what the
 * server thinks the fireon & runon states are.
 */
#define SF_FIREON   0x01
#define SF_RUNON    0x02

/* The following are the color flags passed to new_draw_info.
 *
 * We also set up some control flags
 *
 * NDI = New Draw Info
 */

/* Color specifications - note these match the order in xutil.c */
/* Note 2:  Black, the default color, is 0.  Thus, it does not need to
 * be implicitly specified.
 */
#define NDI_BLACK       0
#define NDI_WHITE       1
#define NDI_NAVY        2
#define NDI_RED         3
#define NDI_ORANGE      4
#define NDI_BLUE        5       /* Actually, it is Dodger Blue */
#define NDI_DK_ORANGE   6       /* DarkOrange2 */
#define NDI_GREEN       7       /* SeaGreen */
#define NDI_LT_GREEN    8       /* DarkSeaGreen,  which is actually paler */
                                /* Than seagreen - also background color */
#define NDI_GREY        9
#define NDI_BROWN       10      /* Sienna */
#define NDI_GOLD        11
#define NDI_TAN         12      /* Khaki */

#define NDI_MAX_COLOR   12      /* Last value in */
#define NDI_COLOR_MASK  0x1f    /* Gives lots of room for expansion - we are */
                                /* using an int anyways, so we have the space */
                                /* to still do all the flags */

#define NDI_REPLY       0x20    // is a direct reply to a user command
#define NDI_NOCREATE    0x40    // do not create a tba if one doesn't exist
#define NDI_CLIENT_MASK 0x7f    // what the client is allowed to see

#define NDI_UNIQUE      0x1000  /* Print this out immediately, don't buffer */
#define NDI_ALL         0x2000  /* Inform all players of this message */
#define NDI_DEF         0x4000  // ignore colour for channel protocol

/* Flags for the item command */
enum {a_none, a_readied, a_wielded, a_worn, a_active, a_applied};
#define F_APPLIED       0x000F
#define F_LOCATION      0x00F0
#define F_UNPAID        0x0200
#define F_MAGIC         0x0400
#define F_CURSED        0x0800
#define F_DAMNED        0x1000
#define F_OPEN          0x2000
#define F_NOPICK        0x4000
#define F_LOCKED        0x8000

#define CF_FACE_NONE    0
#define CF_FACE_BITMAP  1
#define CF_FACE_XPM     2
#define CF_FACE_PNG     3
#define CF_FACE_CACHE   0x10

/* Used in the new_face structure on the magicmap field.  Low bits
 * are color informatin.  For now, only high bit information we need
 * is floor information.
 */
#define FACE_FLOOR      0x80
#define FACE_WALL       0x40    /* Or'd into the color value by the server
                                 * right before sending.
                                 */
#define FACE_COLOR_MASK 0xf

#define UPD_LOCATION    0x01
#define UPD_FLAGS       0x02
#define UPD_WEIGHT      0x04
#define UPD_FACE        0x08
#define UPD_NAME        0x10
#define UPD_ANIM        0x20
#define UPD_ANIMSPEED   0x40
#define UPD_NROF        0x80

/* The flag values sent by the updspell command */
#define UPD_SP_MANA     0x01
#define UPD_SP_GRACE    0x02
#define UPD_SP_DAMAGE   0x04

#define SOUND_NORMAL    0
#define SOUND_SPELL     1

struct data
{
  unsigned int len;
  const void *ptr;

  data   (const void *ptr, int len) : len (len), ptr (ptr) { }
  data   (const char *str) : len (strlen (str ? str : 0)), ptr ((void *)str) { }
  data   (const shstr &sh) : len (sh.length ()), ptr ((void *)&sh) { }
};

struct data8
{
  unsigned int len;
  const void *ptr;

  data8  (const void *ptr, int len) : len (len), ptr (ptr) { }
  data8  (const char *str) : len (strlen (str ? str : 0)), ptr ((void *)str) { }
  data8  (const shstr &sh) : len (sh.length ()), ptr ((void *)&sh) { }
};

struct data16
{
  unsigned int len;
  const void *ptr;

  data16 (const void *ptr, int len) : len (len), ptr (ptr) { }
  data16 (const char *str) : len (strlen (str ? str : 0)), ptr ((void *)str) { }
  data16 (const shstr &sh) : len (sh.length ()), ptr ((void *)&sh) { }
};

struct ber32
{
  enum { size = 5 }; // maximum length of an encoded ber32
  uint32 val;

  ber32 (uint32 val) : val (val) { }
};

/* Contains the base information we use to make up a packet we want to send. */
struct packet
{
  enum { bufsize = MAXSOCKBUF };
  enum { hdrlen  = 2 }; // keep this many bytes free at the front

  // strategy: only check on variable-length adds
  // and allow 256 bytes for any headers.
  uint8 *cur;
  uint8 buf_ [hdrlen + bufsize + 256];

  packet ()
  {
    reset ();
  }

  packet (const char *name);

  uint8  operator [](unsigned int i) const { return buf_ [i + hdrlen]; }
  uint8 &operator [](unsigned int i)       { return buf_ [i + hdrlen]; }

        uint8 *buf ()       { return buf_ + hdrlen; }
  const uint8 *buf () const { return buf_ + hdrlen; }

  void reset (int offset = 0) { cur = buf () + offset; }
  int length () const { return cur - buf (); }
  int room () { return bufsize - (cur - buf ()); }

  // unchecked
  packet &operator <<(uint8  v) { *cur++ = v; return *this; }

  packet &operator <<(uint16 v) { return *this << uint8  (v >>  8) << uint8  (v); }
  packet &operator <<(uint32 v) { return *this << uint16 (v >> 16) << uint16 (v); }
  packet &operator <<(uint64 v) { return *this << uint32 (v >> 32) << uint32 (v); }

  packet &operator <<(sint8  v) { return *this << (uint8 )v; }
  packet &operator <<(sint16 v) { return *this << (uint16)v; }
  packet &operator <<(sint32 v) { return *this << (uint32)v; }
  packet &operator <<(sint64 v) { return *this << (uint64)v; }

  // checked
  packet &operator <<(const ber32 v);

  packet &operator <<(const data   &v);
  packet &operator <<(const data8  &v);
  packet &operator <<(const data16 &v);

  packet &operator <<(const char *v);
  packet &operator <<(const shstr &sh) { return *this << data (&sh, sh.length ()); }
  packet &operator <<(const std::string &s) { return *this << data (s.data (), s.size ()); }

  void vprintf (const char *format, va_list ap);

  void printf (const char *format, ...)
  {
    va_list ap;
    va_start (ap, format);
    vprintf (format, ap);
    va_end (ap);
  }
};

inline uint16 net_uint16 (uint8 *data) { return (data [0] << 8) | data [1]; }
inline uint32 net_uint32 (uint8 *data) { return (net_uint16 (data) << 16) | net_uint16 (data + 2); }
inline sint16 net_sint16 (uint8 *data) { return sint16 (net_uint16 (data)); }
inline sint16 net_sint32 (uint8 *data) { return sint32 (net_uint32 (data)); }

#endif

Revision:	1.15
Committed:	Sat Jul 28 12:02:58 2007 UTC (16 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+8 -4 lines
Log Message:	- remote code was not making copies of strings it modified - implemented two ew flags: NDI_REPLY and NDI_DEF. - went over a lot of chat-related code and converted to send_msg, NDI_REPLY and NDI_DEF.
#	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	/* This file defines various flags that both the new client and
25	* newserver uses. These should never be changed, only expanded.
26	* Changing them will likely cause all old clients to not work properly.
27	* While called newclient, it is really used by both the client and
28	* server to keep some values the same.
29	*
30	* Name format is CS_(command)_(flag)
31	* CS = Client/Server.
32	* (command) is protocol command, ie ITEM
33	* (flag) is the flag name
34	*/
35
36	/* It is trivial to keep a link of copy of this file in the client
37	* or server area. But keeping one common file should make things
38	* more reliable, as both the client and server will definately be
39	* talking about the same values.
40	*/
41
42
43	#ifndef NETWORK_H
44	#define NETWORK_H
45
46	#include <cstdarg>
47
48	/* Maximum size of any packet we expect.
49	*
50	* The size must be the same in the server and the client (stupid), and its also NOT
51	* the maximum buffer size as one would expect, but the maximum buffer size + 1.
52	*/
53	#define MAXSOCKBUF 10240
54
55	#define CS_QUERY_YESNO 0x1 /* Yes/no question */
56	#define CS_QUERY_SINGLECHAR 0x2 /* Single character response expected */
57	#define CS_QUERY_HIDEINPUT 0x4 /* Hide input being entered */
58
59	/* These are multiplication values that should be used when changing
60	* floats to ints, and vice version. MULTI is integer representatin
61	* (float to int), MULTF is float, for going from int to float.
62	*/
63	#define FLOAT_MULTI 100000
64	#define FLOAT_MULTF 100000.0
65
66	/* ID's for the various stats that get sent across. */
67
68	#define CS_STAT_HP 1
69	#define CS_STAT_MAXHP 2
70	#define CS_STAT_SP 3
71	#define CS_STAT_MAXSP 4
72	#define CS_STAT_STR 5
73	#define CS_STAT_INT 6
74	#define CS_STAT_WIS 7
75	#define CS_STAT_DEX 8
76	#define CS_STAT_CON 9
77	#define CS_STAT_CHA 10
78	#define CS_STAT_EXP 11
79	#define CS_STAT_LEVEL 12
80	#define CS_STAT_WC 13
81	#define CS_STAT_AC 14
82	#define CS_STAT_DAM 15
83	#define CS_STAT_ARMOUR 16
84	#define CS_STAT_SPEED 17
85	#define CS_STAT_FOOD 18
86	#define CS_STAT_WEAP_SP 19
87	#define CS_STAT_RANGE 20
88	#define CS_STAT_TITLE 21
89	#define CS_STAT_POW 22
90	#define CS_STAT_GRACE 23
91	#define CS_STAT_MAXGRACE 24
92	#define CS_STAT_FLAGS 25
93	#define CS_STAT_WEIGHT_LIM 26
94	#define CS_STAT_EXP64 28
95	#define CS_STAT_SPELL_ATTUNE 29
96	#define CS_STAT_SPELL_REPEL 30
97	#define CS_STAT_SPELL_DENY 31
98
99	/* Start & end of resistances, inclusive. */
100	#define CS_STAT_RESIST_START 100
101	#define CS_STAT_RESIST_END 117
102	#define CS_STAT_RES_PHYS 100
103	#define CS_STAT_RES_MAG 101
104	#define CS_STAT_RES_FIRE 102
105	#define CS_STAT_RES_ELEC 103
106	#define CS_STAT_RES_COLD 104
107	#define CS_STAT_RES_CONF 105
108	#define CS_STAT_RES_ACID 106
109	#define CS_STAT_RES_DRAIN 107
110	#define CS_STAT_RES_GHOSTHIT 108
111	#define CS_STAT_RES_POISON 109
112	#define CS_STAT_RES_SLOW 110
113	#define CS_STAT_RES_PARA 111
114	#define CS_STAT_TURN_UNDEAD 112
115	#define CS_STAT_RES_FEAR 113
116	#define CS_STAT_RES_DEPLETE 114
117	#define CS_STAT_RES_DEATH 115
118	#define CS_STAT_RES_HOLYWORD 116
119	#define CS_STAT_RES_BLIND 117
120
121	/* Start & end of skill experience + skill level, inclusive. */
122	#define CS_STAT_SKILLEXP_START 118
123	#define CS_STAT_SKILLEXP_END 129
124	#define CS_STAT_SKILLEXP_AGILITY 118
125	#define CS_STAT_SKILLEXP_AGLEVEL 119
126	#define CS_STAT_SKILLEXP_PERSONAL 120
127	#define CS_STAT_SKILLEXP_PELEVEL 121
128	#define CS_STAT_SKILLEXP_MENTAL 122
129	#define CS_STAT_SKILLEXP_MELEVEL 123
130	#define CS_STAT_SKILLEXP_PHYSIQUE 124
131	#define CS_STAT_SKILLEXP_PHLEVEL 125
132	#define CS_STAT_SKILLEXP_MAGIC 126
133	#define CS_STAT_SKILLEXP_MALEVEL 127
134	#define CS_STAT_SKILLEXP_WISDOM 128
135	#define CS_STAT_SKILLEXP_WILEVEL 129
136
137	/* CS_STAT_SKILLINFO is used as the starting index point. Skill number->name
138	* map is generated dynamically for the client, so a bunch of entries will
139	* be used here. CS_NUM_SKILLS does not match how many skills there really
140	* are - instead, it is used as a range of values so that the client
141	* can have some idea how many skill categories there may be.
142	*/
143	#define CS_STAT_SKILLINFO 140
144	#define CS_NUM_SKILLS 50
145
146	/* These are used with CS_STAT_FLAGS above to communicate S->C what the
147	* server thinks the fireon & runon states are.
148	*/
149	#define SF_FIREON 0x01
150	#define SF_RUNON 0x02
151
152	/* The following are the color flags passed to new_draw_info.
153	*
154	* We also set up some control flags
155	*
156	* NDI = New Draw Info
157	*/
158
159	/* Color specifications - note these match the order in xutil.c */
160	/* Note 2: Black, the default color, is 0. Thus, it does not need to
161	* be implicitly specified.
162	*/
163	#define NDI_BLACK 0
164	#define NDI_WHITE 1
165	#define NDI_NAVY 2
166	#define NDI_RED 3
167	#define NDI_ORANGE 4
168	#define NDI_BLUE 5 /* Actually, it is Dodger Blue */
169	#define NDI_DK_ORANGE 6 /* DarkOrange2 */
170	#define NDI_GREEN 7 /* SeaGreen */
171	#define NDI_LT_GREEN 8 /* DarkSeaGreen, which is actually paler */
172	/* Than seagreen - also background color */
173	#define NDI_GREY 9
174	#define NDI_BROWN 10 /* Sienna */
175	#define NDI_GOLD 11
176	#define NDI_TAN 12 /* Khaki */
177
178	#define NDI_MAX_COLOR 12 /* Last value in */
179	#define NDI_COLOR_MASK 0x1f /* Gives lots of room for expansion - we are */
180	/* using an int anyways, so we have the space */
181	/* to still do all the flags */
182
183	#define NDI_REPLY 0x20 // is a direct reply to a user command
184	#define NDI_NOCREATE 0x40 // do not create a tba if one doesn't exist
185	#define NDI_CLIENT_MASK 0x7f // what the client is allowed to see
186
187	#define NDI_UNIQUE 0x1000 /* Print this out immediately, don't buffer */
188	#define NDI_ALL 0x2000 /* Inform all players of this message */
189	#define NDI_DEF 0x4000 // ignore colour for channel protocol
190
191	/* Flags for the item command */
192	enum {a_none, a_readied, a_wielded, a_worn, a_active, a_applied};
193	#define F_APPLIED 0x000F
194	#define F_LOCATION 0x00F0
195	#define F_UNPAID 0x0200
196	#define F_MAGIC 0x0400
197	#define F_CURSED 0x0800
198	#define F_DAMNED 0x1000
199	#define F_OPEN 0x2000
200	#define F_NOPICK 0x4000
201	#define F_LOCKED 0x8000
202
203	#define CF_FACE_NONE 0
204	#define CF_FACE_BITMAP 1
205	#define CF_FACE_XPM 2
206	#define CF_FACE_PNG 3
207	#define CF_FACE_CACHE 0x10
208
209	/* Used in the new_face structure on the magicmap field. Low bits
210	* are color informatin. For now, only high bit information we need
211	* is floor information.
212	*/
213	#define FACE_FLOOR 0x80
214	#define FACE_WALL 0x40 /* Or'd into the color value by the server
215	* right before sending.
216	*/
217	#define FACE_COLOR_MASK 0xf
218
219	#define UPD_LOCATION 0x01
220	#define UPD_FLAGS 0x02
221	#define UPD_WEIGHT 0x04
222	#define UPD_FACE 0x08
223	#define UPD_NAME 0x10
224	#define UPD_ANIM 0x20
225	#define UPD_ANIMSPEED 0x40
226	#define UPD_NROF 0x80
227
228	/* The flag values sent by the updspell command */
229	#define UPD_SP_MANA 0x01
230	#define UPD_SP_GRACE 0x02
231	#define UPD_SP_DAMAGE 0x04
232
233	#define SOUND_NORMAL 0
234	#define SOUND_SPELL 1
235
236	struct data
237	{
238	unsigned int len;
239	const void *ptr;
240
241	data (const void *ptr, int len) : len (len), ptr (ptr) { }
242	data (const char str) : len (strlen (str ? str : 0)), ptr ((void )str) { }
243	data (const shstr &sh) : len (sh.length ()), ptr ((void *)&sh) { }
244	};
245
246	struct data8
247	{
248	unsigned int len;
249	const void *ptr;
250
251	data8 (const void *ptr, int len) : len (len), ptr (ptr) { }
252	data8 (const char str) : len (strlen (str ? str : 0)), ptr ((void )str) { }
253	data8 (const shstr &sh) : len (sh.length ()), ptr ((void *)&sh) { }
254	};
255
256	struct data16
257	{
258	unsigned int len;
259	const void *ptr;
260
261	data16 (const void *ptr, int len) : len (len), ptr (ptr) { }
262	data16 (const char str) : len (strlen (str ? str : 0)), ptr ((void )str) { }
263	data16 (const shstr &sh) : len (sh.length ()), ptr ((void *)&sh) { }
264	};
265
266	struct ber32
267	{
268	enum { size = 5 }; // maximum length of an encoded ber32
269	uint32 val;
270
271	ber32 (uint32 val) : val (val) { }
272	};
273
274	/* Contains the base information we use to make up a packet we want to send. */
275	struct packet
276	{
277	enum { bufsize = MAXSOCKBUF };
278	enum { hdrlen = 2 }; // keep this many bytes free at the front
279
280	// strategy: only check on variable-length adds
281	// and allow 256 bytes for any headers.
282	uint8 *cur;
283	uint8 buf_ [hdrlen + bufsize + 256];
284
285	packet ()
286	{
287	reset ();
288	}
289
290	packet (const char *name);
291
292	uint8 operator [](unsigned int i) const { return buf_ [i + hdrlen]; }
293	uint8 &operator [](unsigned int i) { return buf_ [i + hdrlen]; }
294
295	uint8 *buf () { return buf_ + hdrlen; }
296	const uint8 *buf () const { return buf_ + hdrlen; }
297
298	void reset (int offset = 0) { cur = buf () + offset; }
299	int length () const { return cur - buf (); }
300	int room () { return bufsize - (cur - buf ()); }
301
302	// unchecked
303	packet &operator <<(uint8 v) { cur++ = v; return this; }
304
305	packet &operator <<(uint16 v) { return *this << uint8 (v >> 8) << uint8 (v); }
306	packet &operator <<(uint32 v) { return *this << uint16 (v >> 16) << uint16 (v); }
307	packet &operator <<(uint64 v) { return *this << uint32 (v >> 32) << uint32 (v); }
308
309	packet &operator <<(sint8 v) { return *this << (uint8 )v; }
310	packet &operator <<(sint16 v) { return *this << (uint16)v; }
311	packet &operator <<(sint32 v) { return *this << (uint32)v; }
312	packet &operator <<(sint64 v) { return *this << (uint64)v; }
313
314	// checked
315	packet &operator <<(const ber32 v);
316
317	packet &operator <<(const data &v);
318	packet &operator <<(const data8 &v);
319	packet &operator <<(const data16 &v);
320
321	packet &operator <<(const char *v);
322	packet &operator <<(const shstr &sh) { return *this << data (&sh, sh.length ()); }
323	packet &operator <<(const std::string &s) { return *this << data (s.data (), s.size ()); }
324
325	void vprintf (const char *format, va_list ap);
326
327	void printf (const char *format, ...)
328	{
329	va_list ap;
330	va_start (ap, format);
331	vprintf (format, ap);
332	va_end (ap);
333	}
334	};
335
336	inline uint16 net_uint16 (uint8 *data) { return (data [0] << 8) \| data [1]; }
337	inline uint32 net_uint32 (uint8 *data) { return (net_uint16 (data) << 16) \| net_uint16 (data + 2); }
338	inline sint16 net_sint16 (uint8 *data) { return sint16 (net_uint16 (data)); }
339	inline sint16 net_sint32 (uint8 *data) { return sint32 (net_uint32 (data)); }
340
341	#endif
342