server/socket/request.C

/*
 * CrossFire, A Multiplayer game for X-windows
 * 
 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
 * Copyright (C) 2001 Mark Wedel
 * Copyright (C) 1992 Frank Tore Johansen
 * 
 * This program 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 2 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * The author can be reached via e-mail to <crossfire@schmorp.de>
 */

/**
 * \file
 * Client handling.
 *
 * \date 2003-12-02
 *
 * This file implements all of the goo on the server side for handling 
 * clients.  It's got a bunch of global variables for keeping track of 
 * each of the clients. 
 *
 * Note:  All functions that are used to process data from the client
 * have the prototype of (char *data, int datalen, int client_num).  This
 * way, we can use one dispatch table.
 *
 * esrv_map_new starts updating the map
 *
 */

#include <global.h>
#include <sproto.h>

#include <living.h>
#include <commands.h>

/* This block is basically taken from socket.c - I assume if it works there,
 * it should work here.
 */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#include <unistd.h>
#include <sys/time.h>

#include "sounds.h"

/**
 * This table translates the attack numbers as used within the
 * program to the value we use when sending STATS command to the
 * client.  If a value is -1, then we don't send that to the
 * client.
 */
short atnr_cs_stat[NROFATTACKS] = { CS_STAT_RES_PHYS,
  CS_STAT_RES_MAG, CS_STAT_RES_FIRE, CS_STAT_RES_ELEC,
  CS_STAT_RES_COLD, CS_STAT_RES_CONF, CS_STAT_RES_ACID,
  CS_STAT_RES_DRAIN, -1 /* weaponmagic */ ,
  CS_STAT_RES_GHOSTHIT, CS_STAT_RES_POISON,
  CS_STAT_RES_SLOW, CS_STAT_RES_PARA, CS_STAT_TURN_UNDEAD,
  CS_STAT_RES_FEAR, -1 /* Cancellation */ ,
  CS_STAT_RES_DEPLETE, CS_STAT_RES_DEATH,
  -1 /* Chaos */ , -1 /* Counterspell */ ,
  -1 /* Godpower */ , CS_STAT_RES_HOLYWORD,
  CS_STAT_RES_BLIND,
  -1,                           /* Internal */
  -1,                           /* life stealing */
  -1                            /* Disease - not fully done yet */
};

static void
socket_map_scroll (client *ns, int dx, int dy)
{
  struct Map newmap;
  int x, y, mx, my;

  ns->send_packet_printf ("map_scroll %d %d", dx, dy);

  /* If we are using the Map1aCmd, we may in fact send
   * head information that is outside the viewable map.
   * So set the mx,my to the max value we want to
   * look for.  Removed code to do so - it caused extra
   * complexities for the client, and probably doesn't make
   * that much difference in bandwidth.
   */
  mx = ns->mapx;
  my = ns->mapy;

  /* the x and y here are coordinates for the new map, i.e. if we moved
   * (dx,dy), newmap[x][y] = oldmap[x-dx][y-dy].  For this reason,
   * if the destination x or y coordinate is outside the viewable
   * area, we clear the values - otherwise, the old values
   * are preserved, and the check_head thinks it needs to clear them.
   */
  for (x = 0; x < mx; x++)
    {
      for (y = 0; y < my; y++)
        {
          if (x >= ns->mapx || y >= ns->mapy)
            /* clear cells outside the viewable area */
            memset (&newmap.cells[x][y], 0, sizeof (struct MapCell));
          else if ((x + dx) < 0 || (x + dx) >= ns->mapx || (y + dy) < 0 || (y + dy) >= ns->mapy)
            /* clear newly visible tiles within the viewable area */
            memset (&(newmap.cells[x][y]), 0, sizeof (struct MapCell));
          else
            memcpy (&(newmap.cells[x][y]), &(ns->lastmap.cells[x + dx][y + dy]), sizeof (struct MapCell));
        }
    }

  memcpy (&(ns->lastmap), &newmap, sizeof (struct Map));

  /* Make sure that the next "map1" command will be sent (even if it is
   * empty).
   */
  ns->sent_scroll = 1;
}

static void
clear_map (player *pl)
{
  memset (&pl->ns->lastmap, 0, sizeof (pl->ns->lastmap));

  pl->ns->force_newmap = false;

  if (pl->ns->newmapcmd == 1)
    pl->ns->send_packet ("newmap");

  pl->ns->floorbox_reset ();
}

/** check for map/region change and send new map data */
static void
check_map_change (player *pl)
{
  client &socket = *pl->ns;
  object *ob = pl->ob;
  char buf[MAX_BUF];            /* eauugggh */

  if (socket.current_map != ob->map || socket.force_newmap)
    {
      clear_map (pl);
      socket.current_map = ob->map;

      if (socket.mapinfocmd)
        {
          if (ob->map && ob->map->path[0])
            {
              int flags = 0;

              if (ob->map->tile_path[0]) flags |= 1;
              if (ob->map->tile_path[1]) flags |= 2;
              if (ob->map->tile_path[2]) flags |= 4;
              if (ob->map->tile_path[3]) flags |= 8;

              snprintf (buf, MAX_BUF, "mapinfo - spatial %d %d %d %d %d %s",
                        flags, socket.mapx / 2 - ob->x, socket.mapy / 2 - ob->y, ob->map->width, ob->map->height, &ob->map->path);
            }
          else
            snprintf (buf, MAX_BUF, "mapinfo current");

          socket.send_packet (buf);
        }
    }
  else if (socket.current_x != ob->x || socket.current_y != ob->y)
    {
      int dx = ob->x - socket.current_x;
      int dy = ob->y - socket.current_y;

      if (socket.buggy_mapscroll && (abs (dx) > 8 || abs (dy) > 8))
        clear_map (pl);         // current (<= 1.9.1) clients have unchecked buffer overflows
      else
        {
          socket_map_scroll (&socket, ob->x - socket.current_x, ob->y - socket.current_y);
          socket.floorbox_reset ();
        }
    }

  socket.current_x = ob->x;
  socket.current_y = ob->y;

  region *reg = ob->region ();
  if (socket.current_region != reg)
    {
      socket.current_region = reg;
      socket.send_packet_printf ("drawinfo 0 You are now %s.\n(use whereami for more details)", &reg->longname);
    }
}

/**
 * RequestInfo is sort of a meta command. There is some specific
 * request of information, but we call other functions to provide
 * that information.
 */
void
RequestInfo (char *buf, int len, client * ns)
{
  char *params = NULL, *cp;

  /* No match */
  char bigbuf[MAX_BUF];
  int slen;

  /* Set up replyinfo before we modify any of the buffers - this is used
   * if we don't find a match.
   */
  strcpy (bigbuf, "replyinfo ");
  slen = strlen (bigbuf);
  safe_strcat (bigbuf, buf, &slen, MAX_BUF);

  /* find the first space, make it null, and update the
   * params pointer.
   */
  for (cp = buf; *cp != '\0'; cp++)
    if (*cp == ' ')
      {
        *cp = '\0';
        params = cp + 1;
        break;
      }

  if (!strcmp (buf, "image_info"))
    send_image_info (ns, params);
  else if (!strcmp (buf, "image_sums"))
    send_image_sums (ns, params);
  else if (!strcmp (buf, "skill_info"))
    send_skill_info (ns, params);
  else if (!strcmp (buf, "spell_paths"))
    send_spell_paths (ns, params);
  else
    ns->send_packet (bigbuf, len);
}

void
ExtCmd (char *buf, int len, player *pl)
{
  INVOKE_PLAYER (EXTCMD, pl, ARG_DATA (buf, len));
}

void
ExtiCmd (char *buf, int len, client *ns)
{
  INVOKE_CLIENT (EXTICMD, ns, ARG_DATA (buf, len));
}

void
MapInfoCmd (char *buf, int len, player *pl)
{
  // <mapinfo tag spatial tile-path
  // >mapinfo tag spatial flags x y w h hash

  char bigbuf[MAX_BUF], *token;

  token = buf;
  // copy token
  if (!(buf = strchr (buf, ' ')))
    return;

  *buf++ = 0;

  if (!strncmp (buf, "spatial ", 8))
    {
      buf += 8;

      // initial map and its origin
      maptile *map = pl->ob->map;
      sint16 dx, dy;
      int mapx = pl->ns->mapx / 2 - pl->ob->x;
      int mapy = pl->ns->mapy / 2 - pl->ob->y;
      int max_distance = 8;     // limit maximum path length to something generous

      while (*buf && map && max_distance)
        {
          int dir = *buf++;

          switch (dir)
            {
              case '1':
                dx = 0;
                dy = -1;
                map = map->xy_find (dx, dy);
                map && (mapy -= map->height);
                break;
              case '2':
                mapx += map->width;
                dx = map->width;
                dy = 0;
                map = map->xy_find (dx, dy);
                break;
              case '3':
                mapy += map->height;
                dx = 0;
                dy = map->height;
                map = map->xy_find (dx, dy);
                break;
              case '4':
                dx = -1;
                dy = 0;
                map = map->xy_find (dx, dy);
                map && (mapx -= map->width);
                break;
            }

          --max_distance;
        }

      if (!max_distance)
        snprintf (bigbuf, MAX_BUF, "mapinfo %s error", token);
      else if (map && map->path[0])
        {
          int flags = 0;

          if (map->tile_path[0]) flags |= 1;
          if (map->tile_path[1]) flags |= 2;
          if (map->tile_path[2]) flags |= 4;
          if (map->tile_path[3]) flags |= 8;

          snprintf (bigbuf, MAX_BUF, "mapinfo %s spatial %d %d %d %d %d %s", token, flags, mapx, mapy, map->width, map->height, &map->path);
        }
      else
        snprintf (bigbuf, MAX_BUF, "mapinfo %s nomap", token);
    }
  else
    snprintf (bigbuf, MAX_BUF, "mapinfo %s unsupported", token);

  pl->ns->send_packet (bigbuf);
}

/** This is the Setup cmd */
void
SetUp (char *buf, int len, client * ns)
{
  INVOKE_CLIENT (SETUP, ns, ARG_DATA (buf, len));
}

/**
 * The client has requested to be added to the game.
 * This is what takes care of it.  We tell the client how things worked out.
 * I am not sure if this file is the best place for this function.  however,
 * it either has to be here or init_sockets needs to be exported.
 */
void
AddMeCmd (char *buf, int len, client *ns)
{
  INVOKE_CLIENT (ADDME, ns, ARG_DATA (buf, len));
}

/** Reply to ExtendedInfos command */
void
ToggleExtendedInfos (char *buf, int len, client * ns)
{
  char cmdback[MAX_BUF];
  char command[50];
  int info, nextinfo;

  cmdback[0] = '\0';
  nextinfo = 0;

  while (1)
    {
      /* 1. Extract an info */
      info = nextinfo;

      while ((info < len) && (buf[info] == ' '))
        info++;

      if (info >= len)
        break;

      nextinfo = info + 1;

      while ((nextinfo < len) && (buf[nextinfo] != ' '))
        nextinfo++;

      if (nextinfo - info >= 49)        /*Erroneous info asked */
        continue;

      strncpy (command, &(buf[info]), nextinfo - info);

      /* 2. Interpret info */
      if (!strcmp ("smooth", command))
        /* Toggle smoothing */
        ns->EMI_smooth = !ns->EMI_smooth;
      else
        /*bad value */;

      /*3. Next info */
    }

  strcpy (cmdback, "ExtendedInfoSet");

  if (ns->EMI_smooth)
    {
      strcat (cmdback, " ");
      strcat (cmdback, "smoothing");
    }

  ns->send_packet (cmdback);
}

/*
#define MSG_TYPE_BOOK            1
#define MSG_TYPE_CARD            2
#define MSG_TYPE_PAPER           3
#define MSG_TYPE_SIGN            4
#define MSG_TYPE_MONUMENT        5
#define MSG_TYPE_SCRIPTED_DIALOG 6*/

/** Reply to ExtendedInfos command */
void
ToggleExtendedText (char *buf, int len, client * ns)
{
  char cmdback[MAX_BUF];
  char temp[10];
  char command[50];
  int info, nextinfo, i, flag;

  cmdback[0] = '\0';

  nextinfo = 0;
  while (1)
    {
      /* 1. Extract an info */
      info = nextinfo;

      while ((info < len) && (buf[info] == ' '))
        info++;

      if (info >= len)
        break;

      nextinfo = info + 1;

      while ((nextinfo < len) && (buf[nextinfo] != ' '))
        nextinfo++;

      if (nextinfo - info >= 49)        /*Erroneous info asked */
        continue;

      strncpy (command, &(buf[info]), nextinfo - info);
      command[nextinfo - info] = '\0';
      /* 2. Interpret info */
      i = sscanf (command, "%d", &flag);

      if ((i == 1) && (flag > 0) && (flag <= MSG_TYPE_LAST))
        ns->supported_readables |= (1 << flag);
      /*3. Next info */
    }

  /* Send resulting state */
  strcpy (cmdback, "ExtendedTextSet");

  for (i = 0; i <= MSG_TYPE_LAST; i++)
    if (ns->supported_readables & (1 << i))
      {
        strcat (cmdback, " ");
        snprintf (temp, sizeof (temp), "%d", i);
        strcat (cmdback, temp);
      }

  ns->send_packet (cmdback);
}

/**
 * client requested an image. send it rate-limited
 * before flushing.
 */
void
AskFaceCmd (char *buf, int len, client *ns)
{
  ns->askface.push_back (atoi (buf));
}

/**
 * Tells client the picture it has to use 
 * to smooth a picture number given as argument.
 */
void
AskSmooth (char *buf, int len, client *ns)
{
  ns->send_face (atoi (buf));
  ns->flush_fx ();
}

/**
 * This handles the general commands from the client (ie, north, fire, cast,
 * etc.)
 */
void
PlayerCmd (char *buf, int len, player *pl)
{
  /* Check if there is a count.  In theory, a zero count could also be
   * sent, so check for that also.
   */
  if (atoi (buf) || buf[0] == '0')
    {
      pl->count = atoi ((char *) buf);

      buf = strchr (buf, ' ');  /* advance beyond the numbers */
      if (!buf)
        return;

      buf++;
    }

  execute_newserver_command (pl->ob, (char *) buf);

  /* Perhaps something better should be done with a left over count.
   * Cleaning up the input should probably be done first - all actions
   * for the command that issued the count should be done before any other
   * commands.
   */
  pl->count = 0;
}


/**
 * This handles the general commands from the client (ie, north, fire, cast,
 * etc.).  It is a lot like PlayerCmd above, but is called with the
 * 'ncom' method which gives more information back to the client so it
 * can throttle.
 */
void
NewPlayerCmd (char *buf, int len, player *pl)
{
  if (len <= 6)
    {
      LOG (llevDebug, "Corrupt ncom command <%s> not long enough - discarding\n", buf);
      return;
    }

  uint16 cmdid  = net_uint16 ((uint8 *)buf);
  sint32 repeat = net_sint32 ((uint8 *)buf + 2);

  /* -1 is special - no repeat, but don't update */
  if (repeat != -1)
    pl->count = repeat;

  buf += 6; //len -= 6;

  execute_newserver_command (pl->ob, buf);

  /* Perhaps something better should be done with a left over count.
   * Cleaning up the input should probably be done first - all actions
   * for the command that issued the count should be done before any other
   * commands.
   */
  pl->count = 0;

  //TODO: schmorp thinks whatever this calculates, it makes no sense at all
  int time = fabs (pl->ob->speed) < 0.001
                ? time = MAX_TIME * 100
                : time = (int) (MAX_TIME / fabs (pl->ob->speed));

  /* Send confirmation of command execution now */
  packet sl ("comc");
  sl << uint16 (cmdid) << uint32 (time);
  pl->ns->send_packet (sl);
}

/** This is a reply to a previous query. */
void
ReplyCmd (char *buf, int len, client *ns)
{
  if (ns->state == ST_CUSTOM)
    {
      INVOKE_CLIENT (REPLY, ns, ARG_DATA (buf, len));
      return;
    }

  if (!ns->pl)
    return; //TODO: depends on the exact reply we are after
            //TODO: but right now, we always have a ns->pl

  player *pl = ns->pl;

  /* This is to synthesize how the data would be stored if it
   * was normally entered. A bit of a hack, and should be cleaned up
   * once all the X11 code is removed from the server.
   *
   * We pass 13 to many of the functions because this way they
   * think it was the carriage return that was entered, and the
   * function then does not try to do additional input.
   */
  snprintf (pl->write_buf, sizeof (pl->write_buf), ":%s", buf);

  /* this avoids any hacking here */

  switch (ns->state)
    {
      case ST_PLAYING:
        LOG (llevError, "Got reply message with ST_PLAYING input state\n");
        break;

      case ST_GET_PARTY_PASSWORD:    /* Get password for party */
        receive_party_password (pl->ob, 13);
        break;

      default:
        LOG (llevError, "Unknown input state: %d\n", ns->state);
    }
}

/**
 * Client tells its version.  If there is a mismatch, we close the
 * socket.  In real life, all we should care about is the client having
 * something older than the server.  If we assume the client will be
 * backwards compatible, having it be a later version should not be a 
 * problem.
 */
void
VersionCmd (char *buf, int len, client * ns)
{
  if (!buf)
    {
      LOG (llevError, "CS: received corrupted version command\n");
      return;
    }

  ns->cs_version = atoi (buf);
  ns->sc_version = ns->cs_version;

  LOG (llevDebug, "connection from client <%s>\n", buf);

  //TODO: should log here just for statistics

  //if (VERSION_CS != ns->cs_version)
  //  unchecked;

  char *cp = strchr (buf + 1, ' ');
  if (!cp)
    return;

  ns->sc_version = atoi (cp);

  //if (VERSION_SC != ns->sc_version)
  //  unchecked;

  cp = strchr (cp + 1, ' ');

  if (cp)
    {
      ns->version = cp + 1;

      if (ns->sc_version < 1026)
        ns->send_packet_printf ("drawinfo %d %s", NDI_RED,
                   "**** VERSION WARNING ****\n**** CLIENT IS TOO OLD!! UPDATE THE CLIENT!! ****");
    }
}

/** sound related functions. */
void
SetSound (char *buf, int len, client * ns)
{
  ns->sound = atoi (buf);
}

/** client wants the map resent */
void
MapRedrawCmd (char *buf, int len, player *pl)
{
/* This function is currently disabled; just clearing the map state results in
 * display errors. It should clear the cache and send a newmap command.
 * Unfortunately this solution does not work because some client versions send
 * a mapredraw command after receiving a newmap command.
 */
}

/**
 * Moves an object (typically, container to inventory).
 * syntax is: move (to) (tag) (nrof)
 */
void
MoveCmd (char *buf, int len, player *pl)
{
  int vals[3], i;

  /* A little funky here.  We only cycle for 2 records, because
   * we obviously are not going to find a space after the third
   * record. Perhaps we should just replace this with a
   * sscanf?
   */
  for (i = 0; i < 2; i++)
    {
      vals[i] = atoi (buf);

      if (!(buf = strchr (buf, ' ')))
        {
          LOG (llevError, "Incomplete move command: %s\n", buf);
          return;
        }

      buf++;
    }

  vals[2] = atoi (buf);

/*    LOG(llevDebug,"Move item %d (nrof=%d) to %d.\n", vals[1], vals[2], vals[0]);*/
  esrv_move_object (pl->ob, vals[0], vals[1], vals[2]);
}

/******************************************************************************
 *
 * Start of commands the server sends to the client.
 *
 ******************************************************************************/

/**
 * Asks the client to query the user.  This way, the client knows
 * it needs to send something back (vs just printing out a message)
 */
void
send_query (client *ns, uint8 flags, const char *text)
{
  ns->send_packet_printf ("query %d %s", flags, text ? text : "");
}

/**
 * Get player's current range attack in obuf.
 */
static void
rangetostring (object *ob, char *obuf)
{
  dynbuf_text buf;

  player *pl = ob->contr;

  if (pl->ranged_skill)
    {
      buf.printf (" Range: %s", &pl->ranged_skill->name);

      if (pl->ranged_ob)
        buf.printf (" (%s)", query_base_name (pl->ranged_ob, 0));
    }

  if (pl->combat_skill)
    {
      buf.printf (" Combat: %s", &pl->combat_skill->name);

      if (pl->combat_ob)
        buf.printf (" (%s)", query_base_name (pl->combat_ob, 0));
    }

  if (pl->golem)
    buf.printf (" Golem: %s", &pl->golem->name);

  strcpy (obuf, buf.linearise () + 1);
}

#define AddIfInt64(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        sl << uint8 (Type) << uint64 (New); \
                       }

#define AddIfInt(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        sl << uint8 (Type) << uint32 (New); \
                       }

#define AddIfShort(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        sl << uint8 (Type) << uint16 (New); \
                       }

#define AddIfFloat(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        sl << uint8 (Type) << uint32 (New*FLOAT_MULTI); \
                        }

#define AddIfString(Old,New,Type) if (Old == NULL || strcmp(Old,New)) {\
                        free(Old); Old = strdup (New);\
                        sl << uint8 (Type) << data8 (New); \
                        }

/**
 * Sends a statistics update.  We look at the old values,
 * and only send what has changed.  Stat mapping values are in newclient.h
 * Since this gets sent a lot, this is actually one of the few binary
 * commands for now.
 */
void
esrv_update_stats (player *pl)
{
  char buf[MAX_BUF];
  uint16 flags;

  client *ns = pl->ns;
  if (!ns)
    return;

  object *ob = pl->ob;
  if (!ob)
    return;

  packet sl ("stats");

  AddIfShort (ns->last_stats.hp,       ob->stats.hp,       CS_STAT_HP);
  AddIfShort (ns->last_stats.maxhp,    ob->stats.maxhp,    CS_STAT_MAXHP);
  AddIfShort (ns->last_stats.sp,       ob->stats.sp,       CS_STAT_SP);
  AddIfShort (ns->last_stats.maxsp,    ob->stats.maxsp,    CS_STAT_MAXSP);
  AddIfShort (ns->last_stats.grace,    ob->stats.grace,    CS_STAT_GRACE);
  AddIfShort (ns->last_stats.maxgrace, ob->stats.maxgrace, CS_STAT_MAXGRACE);
  AddIfShort (ns->last_stats.Str,      ob->stats.Str,      CS_STAT_STR);
  AddIfShort (ns->last_stats.Dex,      ob->stats.Dex,      CS_STAT_DEX);
  AddIfShort (ns->last_stats.Con,      ob->stats.Con,      CS_STAT_CON);
  AddIfShort (ns->last_stats.Int,      ob->stats.Int,      CS_STAT_INT);
  AddIfShort (ns->last_stats.Wis,      ob->stats.Wis,      CS_STAT_WIS);
  AddIfShort (ns->last_stats.Pow,      ob->stats.Pow,      CS_STAT_POW);
  AddIfShort (ns->last_stats.Cha,      ob->stats.Cha,      CS_STAT_CHA);

  for (int s = 0; s < NUM_SKILLS; s++)
    if (object *skill = pl->last_skill_ob[s])
      if (skill->stats.exp != ns->last_skill_exp [s])
        {
          ns->last_skill_exp [s] = skill->stats.exp;

          /* Always send along the level if exp changes.  This is only
           * 1 extra byte, but keeps processing simpler.
           */
          sl << uint8 (s + CS_STAT_SKILLINFO)
             << uint8 (skill->level)
             << uint64 (skill->stats.exp);
        }

  AddIfInt64 (ns->last_stats.exp,  ob->stats.exp, CS_STAT_EXP64);
  AddIfShort (ns->last_level,      ob->level, CS_STAT_LEVEL);
  AddIfShort (ns->last_stats.wc,   ob->stats.wc, CS_STAT_WC);
  AddIfShort (ns->last_stats.ac,   ob->stats.ac, CS_STAT_AC);
  AddIfShort (ns->last_stats.dam,  ob->stats.dam, CS_STAT_DAM);
  AddIfFloat (ns->last_speed,      ob->speed, CS_STAT_SPEED);
  AddIfShort (ns->last_stats.food, ob->stats.food, CS_STAT_FOOD);
  AddIfFloat (ns->last_weapon_sp,  pl->weapon_sp, CS_STAT_WEAP_SP);
  AddIfInt   (ns->last_weight_limit, weight_limit[ob->stats.Str], CS_STAT_WEIGHT_LIM);

  flags = 0;

  if (pl->fire_on)
    flags |= SF_FIREON;

  if (pl->run_on)
    flags |= SF_RUNON;

  AddIfShort (ns->last_flags, flags, CS_STAT_FLAGS);

  if (ns->sc_version < 1025)
    { AddIfShort (ns->last_resist[ATNR_PHYSICAL], ob->resist[ATNR_PHYSICAL], CS_STAT_ARMOUR) }
  else
    for (int i = 0; i < NROFATTACKS; i++)
      {
        /* Skip ones we won't send */
        if (atnr_cs_stat[i] == -1)
          continue;

        AddIfShort (ns->last_resist[i], ob->resist[i], atnr_cs_stat[i]);
      }

  if (pl->ns->monitor_spells)
    {
      AddIfInt (ns->last_path_attuned,  ob->path_attuned,  CS_STAT_SPELL_ATTUNE);
      AddIfInt (ns->last_path_repelled, ob->path_repelled, CS_STAT_SPELL_REPEL);
      AddIfInt (ns->last_path_denied,   ob->path_denied,   CS_STAT_SPELL_DENY);
    }

  rangetostring (ob, buf);  /* we want use the new fire & run system in new client */
  AddIfString (ns->stats.range, buf, CS_STAT_RANGE);
  set_title (ob, buf);
  AddIfString (ns->stats.title, buf, CS_STAT_TITLE);

  /* Only send it away if we have some actual data */
  if (sl.length () > 6)
    ns->send_packet (sl);
}

/**
 * Tells the client that here is a player it should start using.
 */
void
esrv_new_player (player *pl, uint32 weight)
{
  packet sl ("player");

  sl << uint32 (pl->ob->count)
     << uint32 (weight)
     << uint32 (pl->ob->face)
     << data8  (pl->ob->name);

  pl->ns->last_weight = weight;
  pl->ns->send_packet (sl);
  SET_FLAG (pl->ob, FLAG_CLIENT_SENT);
}

/******************************************************************************
 *
 * Start of map related commands.
 *
 ******************************************************************************/

/** Clears a map cell */
static void
map_clearcell (struct MapCell *cell, int count)
{
  cell->faces[0]  = 0;
  cell->faces[1]  = 0;
  cell->faces[2]  = 0;
  cell->smooth[0] = 0;
  cell->smooth[1] = 0;
  cell->smooth[2] = 0;
  cell->count     = count;
  cell->stat_hp   = 0;
  cell->flags     = 0;
  cell->player    = 0;
}

#define MAX_LAYERS      3

/**
 * Removes the need to replicate the same code for each layer.
 * this returns true if this space is now in fact different than
 * it was.
 * sl is the socklist this data is going into.
 * ns is the socket we are working on - all the info we care
 * about is in this socket structure, so now need not pass the
 * entire player object.
 * layer is the layer to update, with 2 being the floor and 0 the
 * top layer (this matches what the GET_MAP_FACE and GET_MAP_FACE_OBJ)
 * take.  Interesting to note that before this function, the map1 function
 * numbers the spaces differently - I think this was a leftover from
 * the map command, where the faces stack up.  Sinces that is no longer
 * the case, it seems to make more sense to have these layer values
 * actually match.
 */
static int
update_space (packet &sl, client &ns, mapspace &ms, MapCell &lastcell, int layer)
{
  object *ob = ms.faces_obj [layer];

  /* If there is no object for this space, or if the face for the object
   * is the blank face, set the face number to zero.
   * else if we have the stored head object for this space, that takes
   * precedence over the other object for this space.
   * otherwise, we do special head processing
   */
  uint16 face_num = ob && ob->face != blank_face ? ob->face : 0;

  /* We've gotten what face we want to use for the object.  Now see if
   * if it has changed since we last sent it to the client.
   */
  if (lastcell.faces[layer] != face_num)
    {
      lastcell.faces[layer] = face_num;

      if (!ns.faces_sent[face_num])
        if (ob)
          ns.send_faces (ob);
        else
          ns.send_face (face_num);

      sl << uint16 (face_num);
      return 1;
    }

  /* Nothing changed */
  return 0;
}

/**
 * Returns the size of a data for a map square as returned by
 * mapextended. There are CLIENTMAPX*CLIENTMAPY*LAYERS entries
 * available.
 */
int
getExtendedMapInfoSize (client * ns)
{
  int result = 0;

  if (ns->ext_mapinfos)
    {
      if (ns->EMI_smooth)
        result += 1;            /*One byte for smoothlevel */
    }

  return result;
}

// prefetch (and touch) all maps within a specific distancd
static void
prefetch_surrounding_maps (maptile *map, int distance)
{
  map->last_access = runtime;

  if (--distance)
    for (int dir = 4; --dir; )
      if (const shstr &path = map->tile_path [dir])
        if (maptile *&neigh = map->tile_map [dir])
          prefetch_surrounding_maps (neigh, distance);
        else
          neigh = maptile::find_async (path, map);
}

// prefetch a generous area around the player
static void
prefetch_surrounding_maps (object *op)
{
  prefetch_surrounding_maps (op->map, 3);
}

/**
 * This function uses the new map1 protocol command to send the map
 * to the client.  It is necessary because the old map command supports
 * a maximum map size of 15x15.
 * This function is much simpler than the old one.  This is because
 * the old function optimized to send as few face identifiers as possible,
 * at the expense of sending more coordinate location (coordinates were
 * only 1 byte, faces 2 bytes, so this was a worthwhile savings).  Since
 * we need 2 bytes for coordinates and 2 bytes for faces, such a trade off
 * maps no sense.  Instead, we actually really only use 12 bits for coordinates,
 * and use the other 4 bits for other informatiion.   For full documentation
 * of what we send, see the doc/Protocol file.
 * I will describe internally what we do:
 * the ns->lastmap shows how the map last looked when sent to the client.
 * in the lastmap structure, there is a cells array, which is set to the
 * maximum viewable size (As set in config.h).
 * in the cells, there are faces and a count value.
 * we use the count value to hold the darkness value.  If -1, then this space
 *   is not viewable.
 * we use faces[0] faces[1] faces[2] to hold what the three layers
 * look like.
 */
void
draw_client_map1 (object *pl)
{
  int x, y, ax, ay, startlen, max_x, max_y, oldlen;
  sint16 nx, ny;
  int estartlen, eoldlen;
  uint8 eentrysize;
  uint16 ewhatstart, ewhatflag;
  uint8 extendedinfos;
  maptile *m;

  client &socket = *pl->contr->ns;

  if (!pl->active)
    return;

  check_map_change (pl->contr);
  prefetch_surrounding_maps (pl);

  packet sl (socket.mapmode == Map1Cmd ? "map1" : "map1a");
  packet esl;

  startlen = sl.length ();

  /*Extendedmapinfo structure initialisation */
  if (socket.ext_mapinfos)
    {
      extendedinfos = EMI_NOREDRAW;

      if (socket.EMI_smooth)
        extendedinfos |= EMI_SMOOTH;

      ewhatstart = esl.length ();
      ewhatflag = extendedinfos;        /*The EMI_NOREDRAW bit
                                           could need to be taken away */
      eentrysize = getExtendedMapInfoSize (&socket);
      esl << "mapextended "
          << uint8 (extendedinfos)
          << uint8 (eentrysize);

      estartlen = esl.length ();
    }

  /* x,y are the real map locations.  ax, ay are viewport relative
   * locations.
   */
  ay = 0;

  /* We could do this logic as conditionals in the if statement,
   * but that started to get a bit messy to look at.
   */
  max_x = pl->x + (socket.mapx + 1) / 2;
  max_y = pl->y + (socket.mapy + 1) / 2;

  maptile *plmap = pl->map;

  for (y = pl->y - socket.mapy / 2; y < max_y; y++, ay++)
    {
      ax = 0;
      for (x = pl->x - socket.mapx / 2; x < max_x; x++, ax++)
        {
          int emask, mask;
          emask = mask = (ax & 0x3f) << 10 | (ay & 0x3f) << 4;

          MapCell &lastcell = socket.lastmap.cells[ax][ay];

          /* If the coordinates are not valid, or it is too dark to see,
           * we tell the client as such
           */
          nx = x;
          ny = y;
          m = get_map_from_coord (plmap, &nx, &ny);

          if (!m)
            {
              /* space is out of map.  Update space and clear values
               * if this hasn't already been done.  If the space is out
               * of the map, it shouldn't have a head
               */
              if (lastcell.count != -1)
                {
                  sl << uint16 (mask);
                  map_clearcell (&lastcell, -1);
                }

              continue;
            }
            
          m->touch ();

          int d = pl->contr->blocked_los[ax][ay];

          if (d > 3)
            {

              int need_send = 0, count;

              /* This block deals with spaces that are not visible for whatever
               * reason. Still may need to send the head for this space.
               */

              oldlen = sl.length ();

              sl << uint16 (mask);

              if (lastcell.count != -1)
                need_send = 1;

              count = -1;

              /* properly clear a previously sent big face */
              if (lastcell.faces[0] || lastcell.faces[1] || lastcell.faces[2]
                  || lastcell.stat_hp || lastcell.flags || lastcell.player)
                need_send = 1;

              map_clearcell (&lastcell, count);

              if ((mask & 0xf) || need_send)
                sl[oldlen + 1] = mask & 0xff;
              else
                sl.reset (oldlen);
            }
          else
            {
              /* In this block, the space is visible.
               */

              /* Rather than try to figure out what everything that we might
               * need to send is, then form the packet after that,
               * we presume that we will in fact form a packet, and update
               * the bits by what we do actually send.  If we send nothing,
               * we just back out sl.length () to the old value, and no harm
               * is done.
               * I think this is simpler than doing a bunch of checks to see
               * what if anything we need to send, setting the bits, then
               * doing those checks again to add the real data.
               */
              oldlen  = sl.length ();
              eoldlen = esl.length ();

              sl << uint16 (mask);

              unsigned char dummy;
              unsigned char *last_ext = &dummy;

              /* Darkness changed */
              if (lastcell.count != d && socket.darkness)
                {
                  mask |= 0x8;

                  if (socket.extmap)
                    {
                      *last_ext |= 0x80;
                      last_ext = &sl[sl.length ()];
                      sl << uint8 (d);
                    }
                  else
                    sl << uint8 (255 - 64 * d);
                }

              lastcell.count = d;

              mapspace &ms = m->at (nx, ny);

              if (socket.extmap)
                {
                  uint8 stat_hp    = 0;
                  uint8 stat_width = 0;
                  uint8 flags      = 0;
                  tag_t player     = 0;

                  // send hp information, if applicable
                  if (object *op = ms.faces_obj [0])
                    {
                      if (op->head || op->invisible)
                        ;       // do not show
                      else if (op->type == PLAYER
                               || QUERY_FLAG (op, FLAG_MONSTER) || QUERY_FLAG (op, FLAG_ALIVE) || QUERY_FLAG (op, FLAG_GENERATOR))
                        {
                          if (op->stats.maxhp > 0 && (unsigned) op->stats.maxhp > (unsigned) op->stats.hp)
                            {
                              stat_hp = 255 - (op->stats.hp * 255 + 254) / op->stats.maxhp;
                              stat_width = op->arch->tail_x;
                            }
                        }

                      if (op->msg && op->msg[0] == '@')
                        flags |= 1;

                      if (op->type == PLAYER && op != pl)
                        player = op->count;
                    }

                  if (lastcell.stat_hp != stat_hp)
                    {
                      lastcell.stat_hp = stat_hp;

                      mask |= 0x8;
                      *last_ext |= 0x80;
                      last_ext = &sl[sl.length ()];

                      sl << uint8 (5) << uint8 (stat_hp);

                      if (stat_width > 1)
                        {
                          *last_ext |= 0x80;
                          last_ext = &sl[sl.length ()];

                          sl << uint8 (6) << uint8 (stat_width);
                        }
                    }

                  if (lastcell.player != player)
                    {
                      lastcell.player = player;

                      mask |= 0x8;
                      *last_ext |= 0x80;
                      last_ext = &sl[sl.length ()];

                      sl << uint8 (0x47) << uint8 (4) << (uint32)player;
                    }

                  if (lastcell.flags != flags)
                    {
                      lastcell.flags = flags;

                      mask |= 0x8;
                      *last_ext |= 0x80;
                      last_ext = &sl[sl.length ()];

                      sl << uint8 (8) << uint8 (flags);
                    }
                }

              /* Floor face */
              if (update_space (sl, socket, ms, lastcell, 2))
                mask |= 0x4;

              /* Middle face */
              if (update_space (sl, socket, ms, lastcell, 1))
                mask |= 0x2;

              if (ms.player () == pl
                  && (pl->invisible & (pl->invisible < 50 ? 1 : 7)))
                {
                  // force player to be visible to himself if invisible
                  if (lastcell.faces[0] != pl->face)
                    {
                      lastcell.faces[0] = pl->face;

                      mask |= 0x1;
                      sl << uint16 (pl->face);

                      socket.send_faces (pl);
                    }
                }
              /* Top face */
              else if (update_space (sl, socket, ms, lastcell, 0))
                mask |= 0x1;
              

              /* Check to see if we are in fact sending anything for this
               * space by checking the mask.  If so, update the mask.
               * if not, reset the len to that from before adding the mask
               * value, so we don't send those bits.
               */
              if (mask & 0xf)
                sl[oldlen + 1] = mask & 0xff;
              else
                sl.reset (oldlen);

              if (socket.ext_mapinfos)
                esl << uint16 (emask);

              if (socket.EMI_smooth)
                {
                  for (int layer = 2+1; layer--; )
                    {
                      object *ob = ms.faces_obj [layer];

                      // If there is no object for this space, or if the face for the object
                      // is the blank face, set the smoothlevel to zero.
                      int smoothlevel = ob && ob->face != blank_face ? ob->smoothlevel : 0;

                      // We've gotten what face we want to use for the object.  Now see if
                      // if it has changed since we last sent it to the client.
                      if (lastcell.smooth[layer] != smoothlevel)
                        {
                          lastcell.smooth[layer] = smoothlevel;
                          esl << uint8 (smoothlevel);
                          emask |= 1 << layer;
                        }
                    }

                  if (emask & 0xf)
                    esl[eoldlen + 1] = emask & 0xff;
                  else
                    esl.reset (eoldlen);
                }
            }                   /* else this is a viewable space */
        }                       /* for x loop */
    }                           /* for y loop */

  socket.flush_fx ();

  /* Verify that we in fact do need to send this */
  if (socket.ext_mapinfos)
    {
      if (!(sl.length () > startlen || socket.sent_scroll))
        {
          /* No map data will follow, so don't say the client
           * it doesn't need draw!
           */
          ewhatflag &= ~EMI_NOREDRAW;
          esl[ewhatstart + 1] = ewhatflag & 0xff;
        }

      if (esl.length () > estartlen)
        socket.send_packet (esl);
    }

  if (sl.length () > startlen || socket.sent_scroll)
    {
      socket.send_packet (sl);
      socket.sent_scroll = 0;
    }
}

/**
 * Draws client map.
 */
void
draw_client_map (object *pl)
{
  int i, j;
  sint16 ax, ay;        /* ax and ay goes from 0 to max-size of arrays */
  int mflags;
  struct Map newmap;
  maptile *m, *pm;

  if (pl->type != PLAYER)
    {
      LOG (llevError, "draw_client_map called with non player/non eric-server\n");
      return;
    }

  pm = pl->map;

  /* If player is just joining the game, he isn't here yet, so the map
   * can get swapped out.  If so, don't try to send them a map.  All will
   * be OK once they really log in.
   */
  if (pm == NULL || pm->in_memory != MAP_IN_MEMORY)
    return;

  memset (&newmap, 0, sizeof (struct Map));

  for (j = (pl->y - pl->contr->ns->mapy / 2); j < (pl->y + (pl->contr->ns->mapy + 1) / 2); j++)
    for (i = (pl->x - pl->contr->ns->mapx / 2); i < (pl->x + (pl->contr->ns->mapx + 1) / 2); i++)
      {
        ax = i;
        ay = j;
        m = pm;
        mflags = get_map_flags (m, &m, ax, ay, &ax, &ay);

        if (mflags & P_OUT_OF_MAP)
          continue;

        /* If a map is visible to the player, we don't want to swap it out
         * just to reload it.  This should really call something like
         * swap_map, but this is much more efficient and 'good enough'
         */
        if (mflags & P_NEW_MAP)
          m->timeout = 50;
      }

  /* do LOS after calls to update_position */
  if (pl->contr->do_los)
    {
      update_los (pl);
      pl->contr->do_los = 0;
    }

  /* Big maps need a different drawing mechanism to work */
  draw_client_map1 (pl);
}


/*****************************************************************************/

/* GROS: The following one is used to allow a plugin to send a generic cmd to*/

/* a player. Of course, the client need to know the command to be able to    */

/* manage it !                                                               */

/*****************************************************************************/
void
send_plugin_custom_message (object *pl, char *buf)
{
  pl->contr->ns->send_packet (buf);
}

/**
 * This sends the skill number to name mapping.  We ignore
 * the params - we always send the same info no matter what.
 */
void
send_skill_info (client *ns, char *params)
{
  packet sl;
  sl << "replyinfo skill_info\n";

  for (int i = 1; i < NUM_SKILLS; i++)
    sl.printf ("%d:%s\n", i + CS_STAT_SKILLINFO, &skill_names[i]);

  if (sl.length () >= MAXSOCKBUF)
    {
      LOG (llevError, "Buffer overflow in send_skill_info!\n");
      fatal (0);
    }

  ns->send_packet (sl);
}

/**
 * This sends the spell path to name mapping.  We ignore
 * the params - we always send the same info no matter what.
 */
void
send_spell_paths (client * ns, char *params)
{
  packet sl;

  sl << "replyinfo spell_paths\n";

  for (int i = 0; i < NRSPELLPATHS; i++)
    sl.printf ("%d:%s\n", 1 << i, spellpathnames[i]);

  if (sl.length () >= MAXSOCKBUF)
    {
      LOG (llevError, "Buffer overflow in send_spell_paths!\n");
      fatal (0);
    }

  ns->send_packet (sl);
}

/**
 * This looks for any spells the player may have that have changed their stats.
 * it then sends an updspell packet for each spell that has changed in this way
 */
void
esrv_update_spells (player *pl)
{
  if (!pl->ns)
    return;

  if (!pl->ns->monitor_spells)
    return;

  for (object *spell = pl->ob->inv; spell; spell = spell->below)
    {
      if (spell->type == SPELL)
        {
          int flags = 0;

          /* check if we need to update it */
          if (spell->last_sp != SP_level_spellpoint_cost (pl->ob, spell, SPELL_MANA))
            {
              spell->last_sp = SP_level_spellpoint_cost (pl->ob, spell, SPELL_MANA);
              flags |= UPD_SP_MANA;
            }

          if (spell->last_grace != SP_level_spellpoint_cost (pl->ob, spell, SPELL_GRACE))
            {
              spell->last_grace = SP_level_spellpoint_cost (pl->ob, spell, SPELL_GRACE);
              flags |= UPD_SP_GRACE;
            }

          if (spell->last_eat != spell->stats.dam + SP_level_dam_adjust (pl->ob, spell))
            {
              spell->last_eat = spell->stats.dam + SP_level_dam_adjust (pl->ob, spell);
              flags |= UPD_SP_DAMAGE;
            }

          if (flags)
            {
              packet sl;

              sl << "updspell "
                 << uint8 (flags)
                 << uint32 (spell->count);

              if (flags & UPD_SP_MANA  ) sl << uint16 (spell->last_sp);
              if (flags & UPD_SP_GRACE ) sl << uint16 (spell->last_grace);
              if (flags & UPD_SP_DAMAGE) sl << uint16 (spell->last_eat);

              pl->ns->send_packet (sl);
            }
        }
    }
}

void
esrv_remove_spell (player *pl, object *spell)
{
  if (!pl->ns->monitor_spells)
    return;

  if (!pl || !spell || spell->env != pl->ob)
    {
      LOG (llevError, "Invalid call to esrv_remove_spell");
      return;
    }

  packet sl ("delspell");

  sl << uint32 (spell->count);

  pl->ns->send_packet (sl);
}

/* appends the spell *spell to the Socklist we will send the data to. */
static void
append_spell (player *pl, packet &sl, object *spell)
{
  int i, skill = 0;

  if (!(spell->name))
    {
      LOG (llevError, "item number %d is a spell with no name.\n", spell->count);
      return;
    }

  /* store costs and damage in the object struct, to compare to later */
  spell->last_sp    = SP_level_spellpoint_cost (pl->ob, spell, SPELL_MANA);
  spell->last_grace = SP_level_spellpoint_cost (pl->ob, spell, SPELL_GRACE);
  spell->last_eat   = spell->stats.dam + SP_level_dam_adjust (pl->ob, spell);

  /* figure out which skill it uses, if it uses one */
  if (spell->skill)
    {
      for (i = 1; i < NUM_SKILLS; i++)
        if (!strcmp (spell->skill, skill_names[i]))
          {
            skill = i + CS_STAT_SKILLINFO;
            break;
          }
    }

  // spells better have a face
  if (!spell->face)
    {
      LOG (llevError, "%s: spell has no face, but face is mandatory.\n", &spell->name);
      spell->face = face_find ("burnout.x11", blank_face);
    }

  /* send the current values */
  sl << uint32 (spell->count)
     << uint16 (spell->level)
     << uint16 (spell->casting_time)
     << uint16 (spell->last_sp)
     << uint16 (spell->last_grace)
     << uint16 (spell->last_eat)
     << uint8  (skill)
     << uint32 (spell->path_attuned)
     << uint32 (spell->face)
     << data8  (spell->name)
     << data16 (spell->msg);
}

/**
 * This tells the client to add the spell *ob, if *ob is NULL, then add 
 * all spells in the player's inventory.
 */
void
esrv_add_spells (player *pl, object *spell)
{
  if (!pl)
    {
      LOG (llevError, "esrv_add_spells, tried to add a spell to a NULL player");
      return;
    }

  if (!pl->ns->monitor_spells)
    return;

  packet sl ("addspell");

  if (!spell)
    {
      for (spell = pl->ob->inv; spell; spell = spell->below)
        {
          /* were we to simply keep appending data here, we could exceed 
           * MAXSOCKBUF if the player has enough spells to add, we know that
           * append_spells will always append 19 data bytes, plus 4 length
           * bytes and 3 strings (because that is the spec) so we need to
           * check that the length of those 3 strings, plus the 23 bytes, 
           * won't take us over the length limit for the socket, if it does,
           * we need to send what we already have, and restart packet formation 
           */
          /* Seeing crashes by overflowed buffers.  Quick arithemetic seems
           * to show add_spell is 26 bytes + 2 strings.  However, the overun
           * is hundreds of bytes off, so correcting 22 vs 26 doesn't seem
           * like it will fix this
           */
          if (spell->type != SPELL)
            continue;

          if (sl.length () >= (MAXSOCKBUF - (26 + strlen (spell->name) + (spell->msg ? strlen (spell->msg) : 0))))
            {
              pl->ns->send_packet (sl);

              sl.reset ();
              sl << "addspell ";
            }

          append_spell (pl, sl, spell);
        }
    }
  else if (spell->type != SPELL)
    {
      LOG (llevError, "Asked to send a non-spell object as a spell");
      return;
    }
  else
    append_spell (pl, sl, spell);

  if (sl.length () >= MAXSOCKBUF)
    {
      LOG (llevError, "Buffer overflow in esrv_add_spells!\n");
      fatal (0);
    }

  /* finally, we can send the packet */
  pl->ns->send_packet (sl);
}

Revision:	1.91
Committed:	Mon Apr 30 04:25:30 2007 UTC (17 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.90:	+32 -0 lines
Log Message:	This is the first rough cut of the skill use system (use the STABLE tag). Details will likely change, and combat skills do not work very well, but it works quite well. Players no longer have a shoottype or range slots, instead, each player has these members: combat_skill/combat_ob the currently selected skill (and weapon) for direct attacks. ranged_skill/ranged_ob the currently selected ranged skill (and bow/spell/item) golem the currently-controlled golem, if any.