server/socket/request.C

/*
    CrossFire, A Multiplayer game for X-windows

    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
 *
 * esrv_map_setbelow allows filling in all of the faces for the map.
 * if a face has not already been sent to the client, it is sent now.
 *
 * mapcellchanged, compactlayer, compactstack, perform the map compressing
 * operations
 *
 */

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

#include <newclient.h>
#include <newserver.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>

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif

#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_socket * ns, int dx, int dy)
{
  struct Map newmap;
  int x, y, mx, my;

  {
    packet sl;

    sl.printf ("map_scroll %d %d", dx, dy);
    ns->send_packet (sl);
  }

  /* 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;

  if (ns->mapmode == Map1aCmd)
    {
      mx += MAX_HEAD_OFFSET;
      my += MAX_HEAD_OFFSET;
    }

  /* 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)
{
  client_socket &socket = *pl->socket;

  memset (&socket.lastmap, 0, sizeof (socket.lastmap));

  if (socket.newmapcmd == 1)
    socket.send_packet ("newmap");

  socket.update_look = 1;
  socket.look_position = 0;
}

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

  if (socket.current_map != ob->map)
    {
      socket.current_map = ob->map;

      clear_map (pl);

      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.update_look = 1;
          socket.look_position = 0;
        }
    }

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

void
ExtCmd (char *buf, int len, player *pl)
{
  INVOKE_PLAYER (EXTCMD, pl, 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->socket->mapx / 2 - pl->ob->x;
      int mapy = pl->socket->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 = get_map_from_coord (map, &dx, &dy);
                  map && (mapy -= map->height);
                  break;
                case '2':
                  mapx += map->width;
                  dx = map->width;
                  dy = 0;
                  map = get_map_from_coord (map, &dx, &dy);
                  break;
                case '3':
                  mapy += map->height;
                  dx = 0;
                  dy = map->height;
                  map = get_map_from_coord (map, &dx, &dy);
                  break;
                case '4':
                  dx = -1;
                  dy = 0;
                  map = get_map_from_coord (map, &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->socket->send_packet (bigbuf);
}

/** This is the Setup cmd - easy first implementation */
void
SetUp (char *buf, int len, client_socket * ns)
{
  int s, slen;
  char *cmd, *param, cmdback[HUGE_BUF];

  /* run through the cmds of setup
   * syntax is setup <cmdname1> <parameter> <cmdname2> <parameter> ...
   *
   * we send the status of the cmd back, or a FALSE is the cmd is the server unknown
   * The client then must sort this out
   */

  //LOG (llevInfo, "Get SetupCmd:: %s\n", buf);

  strcpy (cmdback, "setup");
  for (s = 0; s < len; )
    {
      cmd = &buf[s];

      /* find the next space, and put a null there */
      for (; buf[s] && buf[s] != ' '; s++)
        ; 

      buf[s++] = 0;

      while (buf[s] == ' ')
        s++;

      if (s >= len)
        break;

      param = &buf[s];

      for (; buf[s] && buf[s] != ' '; s++)
        ;

      buf[s++] = 0;

      while (buf[s] == ' ')
        s++;

      slen = strlen (cmdback);
      safe_strcat (cmdback, " ", &slen, HUGE_BUF);
      safe_strcat (cmdback, cmd, &slen, HUGE_BUF);
      safe_strcat (cmdback, " ", &slen, HUGE_BUF);

      if (!strcmp (cmd, "sound"))
        {
          ns->sound = atoi (param);
          safe_strcat (cmdback, param, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "exp64"))
        {
          ns->exp64 = atoi (param);
          safe_strcat (cmdback, param, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "spellmon"))
        {
          ns->monitor_spells = atoi (param);
          safe_strcat (cmdback, param, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "darkness"))
        {
          ns->darkness = atoi (param);
          safe_strcat (cmdback, param, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "map1cmd"))
        {
          if (atoi (param))
            ns->mapmode = Map1Cmd;
          /* if beyond this size, need to use map1cmd no matter what */
          if (ns->mapx > 11 || ns->mapy > 11)
            ns->mapmode = Map1Cmd;
          safe_strcat (cmdback, ns->mapmode == Map1Cmd ? "1" : "0", &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "map1acmd"))
        {
          if (atoi (param))
            ns->mapmode = Map1aCmd;
          /* if beyond this size, need to use map1acmd no matter what */
          if (ns->mapx > 11 || ns->mapy > 11)
            ns->mapmode = Map1aCmd;
          safe_strcat (cmdback, ns->mapmode == Map1aCmd ? "1" : "0", &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "newmapcmd"))
        {
          ns->newmapcmd = atoi (param);
          safe_strcat (cmdback, param, &slen, HUGE_BUF);
//        } else if (!strcmp(cmd,"plugincmd")) {
//            ns->plugincmd = atoi(param);
//          safe_strcat(cmdback, param, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "mapinfocmd"))
        {
          ns->mapinfocmd = atoi (param);
          safe_strcat (cmdback, "1", &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "extcmd"))
        {
          ns->extcmd = atoi (param);
          safe_strcat (cmdback, "1", &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "extmap"))
        {
          ns->extmap = atoi (param);
          safe_strcat (cmdback, "1", &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "facecache"))
        {
          ns->facecache = atoi (param);
          safe_strcat (cmdback, param, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "faceset"))
        {
          char tmpbuf[20];
          int q = atoi (param);

          if (is_valid_faceset (q))
            ns->faceset = q;
          sprintf (tmpbuf, "%d", ns->faceset);
          safe_strcat (cmdback, tmpbuf, &slen, HUGE_BUF);
          /* if the client is using faceset, it knows about image2 command */
          ns->image2 = 1;
        }
      else if (!strcmp (cmd, "itemcmd"))
        {
          /* Version of the item protocol command to use.  Currently,
           * only supported versions are 1 and 2.  Using a numeric
           * value will make it very easy to extend this in the future.
           */
          char tmpbuf[20];
          int q = atoi (param);

          if (q < 1 || q > 2)
            {
              strcpy (tmpbuf, "FALSE");
            }
          else
            {
              ns->itemcmd = q;
              sprintf (tmpbuf, "%d", ns->itemcmd);
            }
          safe_strcat (cmdback, tmpbuf, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "mapsize"))
        {
          int x, y = 0;
          char tmpbuf[MAX_BUF], *cp;

          x = atoi (param);
          for (cp = param; *cp != 0; cp++)
            if (*cp == 'x' || *cp == 'X')
              {
                y = atoi (cp + 1);
                break;
              }
          if (x < 9 || y < 9 || x > MAP_CLIENT_X || y > MAP_CLIENT_Y)
            {
              sprintf (tmpbuf, " %dx%d", MAP_CLIENT_X, MAP_CLIENT_Y);
              safe_strcat (cmdback, tmpbuf, &slen, HUGE_BUF);
            }
          else
            {
              ns->mapx = x;
              ns->mapy = y;
              /* better to send back what we are really using and not the
               * param as given to us in case it gets parsed differently.
               */
              sprintf (tmpbuf, "%dx%d", x, y);
              safe_strcat (cmdback, tmpbuf, &slen, HUGE_BUF);
              /* If beyond this size and still using orig map command, need to
               * go to map1cmd.
               */
              if ((x > 11 || y > 11) && ns->mapmode == Map0Cmd)
                ns->mapmode = Map1Cmd;
            }
        }
      else if (!strcmp (cmd, "extendedMapInfos"))
        {
          /* Added by tchize
           * prepare to use the mapextended command
           */
          char tmpbuf[20];

          ns->ext_mapinfos = (atoi (param));
          sprintf (tmpbuf, "%d", ns->ext_mapinfos);
          safe_strcat (cmdback, tmpbuf, &slen, HUGE_BUF);
        }
      else if (!strcmp (cmd, "extendedTextInfos"))
        {
          /* Added by tchize
           * prepare to use the extended text commands
           * Client toggle this to non zero to get exttext
           */
          char tmpbuf[20];

          ns->has_readable_type = (atoi (param));
          sprintf (tmpbuf, "%d", ns->has_readable_type);
          safe_strcat (cmdback, tmpbuf, &slen, HUGE_BUF);
        }
      else
        {
          /* Didn't get a setup command we understood -
           * report a failure to the client.
           */
          safe_strcat (cmdback, "FALSE", &slen, HUGE_BUF);
        }
    }                           /* for processing all the setup commands */

  LOG (llevInfo, "SendBack SetupCmd:: %s\n", cmdback);
  ns->send_packet (cmdback);
}

/**
 * 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_socket * ns)
{
  Settings oldsettings;

  oldsettings = settings;
  if (ns->status != Ns_Add || add_player (ns))
    ns->send_packet ("addme_failed");
  else
    ns->send_packet ("addme_success");

  settings = oldsettings;
}

/** Reply to ExtendedInfos command */
void
ToggleExtendedInfos (char *buf, int len, client_socket * 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_socket * 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);
}

/**
 * A lot like the old AskSmooth (in fact, now called by AskSmooth).
 * Basically, it makes no sense to wait for the client to request a 
 * a piece of data from us that we know the client wants.  So
 * if we know the client wants it, might as well push it to the
 * client.
 */
static void
SendSmooth (client_socket * ns, uint16 face)
{
  uint16 smoothface;

  /* If we can't find a face, return and set it so we won't try to send this
   * again.
   */
  if ((!FindSmooth (face, &smoothface)) && (!FindSmooth (smooth_face->number, &smoothface)))
    {

      LOG (llevError, "could not findsmooth for %d. Neither default (%s)\n", face, &smooth_face->name);
      ns->faces_sent[face] |= NS_FACESENT_SMOOTH;
      return;
    }

  if (!(ns->faces_sent[smoothface] & NS_FACESENT_FACE))
    esrv_send_face (ns, smoothface, 0);

  ns->faces_sent[face] |= NS_FACESENT_SMOOTH;

  packet sl;

  sl << "smooth "
     << uint16 (face)
     << uint16 (smoothface);

  ns->send_packet (sl);
}

 /**
  * Tells client the picture it has to use 
  * to smooth a picture number given as argument.
  */
void
AskSmooth (char *buf, int len, client_socket * ns)
{
  uint16 facenbr;

  facenbr = atoi (buf);
  SendSmooth (ns, facenbr);
}

/**
 * This handles the general commands from the client (ie, north, fire, cast,
 * etc.)
 */
void
PlayerCmd (char *buf, int len, player *pl)
{

  /* The following should never happen with a proper or honest client.
   * Therefore, the error message doesn't have to be too clear - if 
   * someone is playing with a hacked/non working client, this gives them
   * an idea of the problem, but they deserve what they get
   */
  if (pl->state != ST_PLAYING)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl->ob, "You can not issue commands - state is not ST_PLAYING (%s)", buf);
      return;
    }
  /* 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)
        {
#ifdef ESRV_DEBUG
          LOG (llevDebug, "PlayerCmd: Got count but no command.\n");
#endif
          return;
        }
      buf++;
    }
  /* This should not happen anymore.    */
  if (pl->ob->speed_left < -1.0)
    {
      LOG (llevError, "Player has negative time - shouldn't do command.\n");
    }
  /* In c_new.c */
  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 (uint8 * buf, int len, player *pl)
{
  int time, repeat;
  char command[MAX_BUF];
  int pktlen;

  if (len < 7)
    {
      LOG (llevDebug, "Corrupt ncom command <%s> not long enough - discarding\n", buf);
      return;
    }

  pktlen = net_uint16 (buf);
  repeat = net_uint32 (buf + 2);

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

  if ((len - 4) >= MAX_BUF)
    len = MAX_BUF - 5;

  strncpy ((char *) command, (char *) buf + 6, len - 4);
  command[len - 4] = '\0';

  /* The following should never happen with a proper or honest client.
   * Therefore, the error message doesn't have to be too clear - if 
   * someone is playing with a hacked/non working client, this gives them
   * an idea of the problem, but they deserve what they get
   */
  if (pl->state != ST_PLAYING)
    {
      new_draw_info_format (NDI_UNIQUE, 0, pl->ob, "You can not issue commands - state is not ST_PLAYING (%s)", buf);
      return;
    }

  /* This should not happen anymore.    */
  if (pl->ob->speed_left < -1.0)
    LOG (llevError, "Player has negative time - shouldn't do command.\n");

  /* In c_new.c */
  execute_newserver_command (pl->ob, (char *) command);
  /* 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;

  if (FABS (pl->ob->speed) < 0.001)
    time = MAX_TIME * 100;
  else
    time = (int) (MAX_TIME / FABS (pl->ob->speed));

  /* Send confirmation of command execution now */

  packet sl;
  sl << "comc " << uint16 (pktlen) << uint32 (time);
  pl->socket->send_packet (sl);
}


/** This is a reply to a previous query. */
void
ReplyCmd (char *buf, int len, player *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 (pl->state)
    {
        case ST_PLAYING:
          LOG (llevError, "Got reply message with ST_PLAYING input state\n");
          break;

        case ST_PLAY_AGAIN:
          /* We can check this for return value (2==quit).  Maybe we
           * should, and do something appropriate?
           */
          receive_play_again (pl->ob, buf[0]);
          break;

        case ST_ROLL_STAT:
          key_roll_stat (pl->ob, buf[0]);
          break;

        case ST_CHANGE_CLASS:

          key_change_class (pl->ob, buf[0]);
          break;

        case ST_CONFIRM_QUIT:
          key_confirm_quit (pl->ob, buf[0]);
          break;

        case ST_CONFIGURE:
          LOG (llevError, "In client input handling, but into configure state\n");
          pl->state = ST_PLAYING;
          break;

        case ST_GET_NAME:
          receive_player_name (pl->ob, 13);
          break;

        case ST_GET_PASSWORD:
        case ST_CONFIRM_PASSWORD:
          receive_player_password (pl->ob, 13);
          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", pl->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_socket * ns)
{
  char *cp;
  char version_warning[256];

  if (!buf)
    {
      LOG (llevError, "CS: received corrupted version command\n");
      return;
    }

  ns->cs_version = atoi (buf);
  ns->sc_version = ns->cs_version;
  if (VERSION_CS != ns->cs_version)
    {
#ifdef ESRV_DEBUG
      LOG (llevDebug, "CS: csversion mismatch (%d,%d)\n", VERSION_CS, ns->cs_version);
#endif
    }
  cp = strchr (buf + 1, ' ');
  if (!cp)
    return;
  ns->sc_version = atoi (cp);
  if (VERSION_SC != ns->sc_version)
    {
#ifdef ESRV_DEBUG
      LOG (llevDebug, "CS: scversion mismatch (%d,%d)\n", VERSION_SC, ns->sc_version);
#endif
    }
  cp = strchr (cp + 1, ' ');
  if (cp)
    {
      LOG (llevDebug, "CS: connection from client of type <%s>, ip %s\n", cp, ns->host);

      snprintf (ns->client, sizeof (ns->client), "%s", cp + 1);

      /* This is first implementation - i skip all beta DX clients with it 
       * Add later stuff here for other clients 
       */

      /* these are old dxclients */
      /* Version 1024 added support for singular + plural name values - 
       * requiing this minimal value reduces complexity of that code, and it
       * has been around for a long time.
       */
      if (ns->sc_version < 1026)
        {
          sprintf (version_warning, "drawinfo %d %s", NDI_RED,
                   "**** VERSION WARNING ****\n**** CLIENT IS TOO OLD!! UPDATE THE CLIENT!! ****");
          ns->send_packet (version_warning);
        }

    }
}

/** sound related functions. */

void
SetSound (char *buf, int len, client_socket * 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.
 */
#if 0
  /* Okay, this is MAJOR UGLY. but the only way I know how to
   * clear the "cache"
   */
  memset (&pl->socket->lastmap, 0, sizeof (struct Map));
  draw_client_map (pl->ob);
#endif
}

/**
 * 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 am 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_socket * ns, uint8 flags, char *text)
{
  char buf[MAX_BUF];

  sprintf (buf, "query %d %s", flags, text ? text : "");
  ns->send_packet (buf);
}

#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;

  packet sl;
  sl << "stats ";

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

  if (pl->socket->exp64)
    {
      uint8 s;

      for (s = 0; s < NUM_SKILLS; s++)
        {
          if (pl->last_skill_ob[s] && pl->last_skill_exp[s] != pl->last_skill_ob[s]->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 (pl->last_skill_ob[s]->level)
                 << uint64 (pl->last_skill_ob[s]->stats.exp);

              pl->last_skill_exp[s] = pl->last_skill_ob[s]->stats.exp;
            }
        }
    }

  if (pl->socket->exp64)
    { AddIfInt64 (pl->last_stats.exp, pl->ob->stats.exp, CS_STAT_EXP64) }
  else
    { AddIfInt (pl->last_stats.exp, (int) pl->ob->stats.exp, CS_STAT_EXP) }

  AddIfShort (pl->last_level, (char) pl->ob->level, CS_STAT_LEVEL);
  AddIfShort (pl->last_stats.wc, pl->ob->stats.wc, CS_STAT_WC);
  AddIfShort (pl->last_stats.ac, pl->ob->stats.ac, CS_STAT_AC);
  AddIfShort (pl->last_stats.dam, pl->ob->stats.dam, CS_STAT_DAM);
  AddIfFloat (pl->last_speed, pl->ob->speed, CS_STAT_SPEED);
  AddIfShort (pl->last_stats.food, pl->ob->stats.food, CS_STAT_FOOD);
  AddIfFloat (pl->last_weapon_sp, pl->weapon_sp, CS_STAT_WEAP_SP);
  AddIfInt (pl->last_weight_limit, (sint32) weight_limit[pl->ob->stats.Str], CS_STAT_WEIGHT_LIM);
  flags = 0;

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

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

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

  if (pl->socket->sc_version < 1025)
    { AddIfShort (pl->last_resist[ATNR_PHYSICAL], pl->ob->resist[ATNR_PHYSICAL], CS_STAT_ARMOUR) }
  else
    {
      int i;

      for (i = 0; i < NROFATTACKS; i++)
        {
          /* Skip ones we won't send */
          if (atnr_cs_stat[i] == -1)
            continue;

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

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

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

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

/**
 * Tells the client that here is a player it should start using.
 */
void
esrv_new_player (player *pl, uint32 weight)
{
  pl->last_weight = weight;

  packet sl;
  sl << "player ";

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

  pl->socket->send_packet (sl);
  SET_FLAG (pl->ob, FLAG_CLIENT_SENT);
}

/**
 * Need to send an animation sequence to the client.
 * We will send appropriate face commands to the client if we haven't
 * sent them the face yet (this can become quite costly in terms of
 * how much we are sending - on the other hand, this should only happen
 * when the player logs in and picks stuff up.
 */
void
esrv_send_animation (client_socket * ns, short anim_num)
{
  int i;

  /* Do some checking on the anim_num we got.  Note that the animations
   * are added in contigous order, so if the number is in the valid
   * range, it must be a valid animation.
   */
  if (anim_num < 0 || anim_num > num_animations)
    {
      LOG (llevError, "esrv_send_anim (%d) out of bounds??\n", anim_num);
      return;
    }

  packet sl;

  sl << "anim "
     << uint16 (anim_num)
     << uint16 (0); /* flags - not used right now */

  /* Build up the list of faces.  Also, send any information (ie, the
   * the face itself) down to the client.
   */
  for (i = 0; i < animations[anim_num].num_animations; i++)
    {
      if (!(ns->faces_sent[animations[anim_num].faces[i]] & NS_FACESENT_FACE))
        esrv_send_face (ns, animations[anim_num].faces[i], 0);
      sl << uint16 (animations[anim_num].faces[i]);   /* flags - not used right now */
    }

  ns->send_packet (sl);

  ns->anims_sent[anim_num] = 1;
}


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

/**
 * This adds face_num to a map cell at x,y.  If the client doesn't have
 * the face yet, we will also send it.
 */
static void
esrv_map_setbelow (client_socket * ns, int x, int y, short face_num, struct Map *newmap)
{
  if (newmap->cells[x][y].count >= MAP_LAYERS)
    {
      LOG (llevError, "Too many faces in map cell %d %d\n", x, y);
      return;
      abort ();
    }

  newmap->cells[x][y].faces[newmap->cells[x][y].count] = face_num;
  newmap->cells[x][y].count++;

  if (!(ns->faces_sent[face_num] & NS_FACESENT_FACE))
    esrv_send_face (ns, face_num, 0);
}

struct LayerCell
{
  uint16 xy;
  short face;
};

struct MapLayer
{
  int count;
  struct LayerCell lcells[MAP_CLIENT_X * MAP_CLIENT_Y];
};

/** Checkes if map cells have changed */
static int
mapcellchanged (client_socket * ns, int i, int j, struct Map *newmap)
{
  int k;

  if (ns->lastmap.cells[i][j].count != newmap->cells[i][j].count)
    return 1;
  for (k = 0; k < newmap->cells[i][j].count; k++)
    {
      if (ns->lastmap.cells[i][j].faces[k] != newmap->cells[i][j].faces[k])
        {
          return 1;
        }
    }
  return 0;
}

/**
 * Basically, what this does is pack the data into layers.
 * cnum is the client number, cur is the the buffer we put all of
 * this data into.  we return the end of the data.  layers is
 * how many layers of data we should back.
 */
static uint8 *
compactlayer (client_socket * ns, unsigned char *cur, int numlayers, struct Map *newmap)
{
  int x, y, k;
  int face;
  unsigned char *fcur;
  struct MapLayer layers[MAP_LAYERS];

  for (k = 0; k < MAP_LAYERS; k++)
    layers[k].count = 0;
  fcur = cur;
  for (x = 0; x < ns->mapx; x++)
    {
      for (y = 0; y < ns->mapy; y++)
        {
          if (!mapcellchanged (ns, x, y, newmap))
            continue;
          if (newmap->cells[x][y].count == 0)
            {
              *cur = x * ns->mapy + y;  /* mark empty space */
              cur++;
              continue;
            }
          for (k = 0; k < newmap->cells[x][y].count; k++)
            {
              layers[k].lcells[layers[k].count].xy = x * ns->mapy + y;
              layers[k].lcells[layers[k].count].face = newmap->cells[x][y].faces[k];
              layers[k].count++;
            }
        }
    }
  /* If no data, return now. */
  if (fcur == cur && layers[0].count == 0)
    return cur;
  *cur = 255;                   /* mark end of explicitly cleared cells */
  cur++;
  /* First pack by layers. */
  for (k = 0; k < numlayers; k++)
    {
      if (layers[k].count == 0)
        break;                  /* once a layer is entirely empty, no layer below it can
                                   have anything in it either */
      /* Pack by entries in thie layer */
      for (x = 0; x < layers[k].count;)
        {
          fcur = cur;
          *cur = layers[k].lcells[x].face >> 8;
          cur++;
          *cur = layers[k].lcells[x].face & 0xFF;
          cur++;
          face = layers[k].lcells[x].face;
          /* Now, we back the redundant data into 1 byte xy pairings */
          for (y = x; y < layers[k].count; y++)
            {
              if (layers[k].lcells[y].face == face)
                {
                  *cur = (uint8) layers[k].lcells[y].xy;
                  cur++;
                  layers[k].lcells[y].face = -1;
                }
            }
          *(cur - 1) = *(cur - 1) | 128;        /* mark for end of xy's; 11*11 < 128 */
          /* forward over the now redundant data */
          while (x < layers[k].count && layers[k].lcells[x].face == -1)
            x++;
        }
      *fcur = *fcur | 128;      /* mark for end of faces at this layer */
    }
  return cur;
}

/** Clears a map cell */
static void
map_clearcell (struct MapCell *cell, int face0, int face1, int face2, int count)
{
  cell->faces[0] = face0;
  cell->faces[1] = face1;
  cell->faces[2] = face2;
  cell->count    = count;
  cell->stat_hp  = 0;
  cell->flags    = 0;
  cell->player   = 0;
}

#define MAX_HEAD_POS    MAX(MAX_CLIENT_X, MAX_CLIENT_Y)
#define MAX_LAYERS      3

/* Using a global really isn't a good approach, but saves the over head of
 * allocating and deallocating such a block of data each time run through,
 * and saves the space of allocating this in the socket object when we only
 * need it for this cycle.  If the serve is ever threaded, this needs to be
 * re-examined.
 */

static object *heads[MAX_HEAD_POS * MAX_HEAD_POS * MAX_LAYERS];

/**
 * Returns true if any of the heads for this
 * space is set.  Returns false if all are blank - this is used
 * for empty space checking.
 */
static inline int
have_head (int ax, int ay)
{

  if (heads[(ay * MAX_HEAD_POS + ax) * MAX_LAYERS] ||
      heads[(ay * MAX_HEAD_POS + ax) * MAX_LAYERS + 1] || heads[(ay * MAX_HEAD_POS + ax) * MAX_LAYERS + 2])
    return 1;
  return 0;
}

/**
 * check_head is a bit simplistic version of update_space below.
 * basically, it only checks the that the head on space ax,ay at layer
 * needs to get sent - if so, it adds the data, sending the head
 * if needed, and returning 1.  If this no data needs to get
 * sent, it returns zero.
 */
static int
check_head (packet &sl, client_socket &ns, int ax, int ay, int layer)
{
  short face_num;

  if (heads[(ay * MAX_HEAD_POS + ax) * MAX_LAYERS + layer])
    face_num = heads[(ay * MAX_HEAD_POS + ax) * MAX_LAYERS + layer]->face->number;
  else
    face_num = 0;

  if (face_num != ns.lastmap.cells[ax][ay].faces[layer])
    {
      sl << uint16 (face_num);
      if (face_num && !(ns.faces_sent[face_num] & NS_FACESENT_FACE))
        esrv_send_face (&ns, face_num, 0);

      heads[(ay * MAX_HEAD_POS + ax) * MAX_LAYERS + layer] = NULL;
      ns.lastmap.cells[ax][ay].faces[layer] = face_num;
      return 1;
    }

  return 0;                     /* No change */
}

/**
 * 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.
 * mx and my are map coordinate offsets for map mp
 * sx and sy are the offsets into the socket structure that
 * holds the old values.
 * 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_socket &ns, maptile *mp, int mx, int my, int sx, int sy, int layer)
{
  object *ob, *head;
  uint16 face_num;
  int bx, by, i;

  /* If there is a multipart object stored away, treat that as more important.
   * If not, then do the normal processing.
   */
  head = heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + layer];

  /* Check to see if this head is part of the set of objects
   * we would normally send for this space.  If so, then
   * don't use the head value.  We need to do the check
   * here and not when setting up the heads[] value for two reasons -
   * 1) the heads[] values will get used even if the space is not visible.
   * 2) its possible the head is not on the same map as a part, and I'd
   *    rather not need to do the map translation overhead.
   * 3) We need to do some extra checking to make sure that we will
   * otherwise send the image as this layer, eg, either it matches
   * the head value, or is not multipart.
   */
  if (head && !head->more)
    {
      for (i = 0; i < MAP_LAYERS; i++)
        {
          ob = GET_MAP_FACE_OBJ (mp, mx, my, i);
          if (!ob)
            continue;

          if (ob->head)
            ob = ob->head;

          if (ob == head)
            {
              heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + layer] = NULL;
              head = NULL;
              break;
            }
        }
    }

  ob = head;
  if (!ob)
    ob = GET_MAP_FACE_OBJ (mp, mx, my, 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
   */
  if (!ob || ob->face == blank_face)
    face_num = 0;
  else if (head)
    {
      /* if this is a head that had previously been stored */
      face_num = ob->face->number;
    }
  else
    {
      /* if the faces for the different parts of a multipart object
       * are the same, we only want to send the bottom right most
       * portion of the object.  That info is in the tail_.. values
       * of the head.  Note that for the head itself, ob->head will
       * be null, so we only do this block if we are working on
       * a tail piece.
       */

      /* tail_x and tail_y will only be set in the head object.  If
       * this is the head object and these are set, we proceed
       * with logic to only send bottom right.  Similarly, if
       * this is one of the more parts but the head has those values
       * set, we want to do the processing.  There can be cases where
       * the head is not visible but one of its parts is, so we just
       * can always expect that ob->arch->tail_x will be true for all
       * object we may want to display.
       */
      if ((ob->arch->tail_x || ob->arch->tail_y) || (ob->head && (ob->head->arch->tail_x || ob->head->arch->tail_y)))
        {

          if (ob->head)
            head = ob->head;
          else
            head = ob;

          /* Basically figure out where the offset is from where we are right
           * now.  the ob->arch->clone.{x,y} values hold the offset that this current
           * piece is from the head, and the tail is where the tail is from the
           * head.  Note that bx and by will equal sx and sy if we are already working
           * on the bottom right corner.  If ob is the head, the clone values
           * will be zero, so the right thing will still happen.
           */
          bx = sx + head->arch->tail_x - ob->arch->clone.x;
          by = sy + head->arch->tail_y - ob->arch->clone.y;

          /* I don't think this can ever happen, but better to check for it just
           * in case.
           */
          if (bx < sx || by < sy)
            {
              LOG (llevError, "update_space: bx (%d) or by (%d) is less than sx (%d) or sy (%d)\n", bx, by, sx, sy);
              face_num = 0;
            }
          /* single part object, multipart object with non merged faces,
           * of multipart object already at lower right.
           */
          else if (bx == sx && by == sy)
            {
              face_num = ob->face->number;

              /* if this face matches one stored away, clear that one away.
               * this code relies on the fact that the map1 commands
               * goes from 2 down to 0.
               */
              for (i = 0; i < MAP_LAYERS; i++)
                if (heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + i] &&
                    heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + i]->face->number == face_num)
                  heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + i] = NULL;
            }
          else
            {
              /* If this head is stored away, clear it - otherwise,
               * there can be cases where a object is on multiple layers - 
               * we only want to send it once.
               */
              face_num = head->face->number;
              for (i = 0; i < MAP_LAYERS; i++)
                if (heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + i] &&
                    heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + i]->face->number == face_num)
                  heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + i] = NULL;

              /* First, try to put the new head on the same layer.  If that is used up,
               * then find another layer.
               */
              if (heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + layer] == NULL)
                {
                  heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + layer] = head;
                }
              else
                for (i = 0; i < MAX_LAYERS; i++)
                  {
                    if (heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + i] == NULL ||
                        heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + i] == head)
                      {
                        heads[(by * MAX_HEAD_POS + bx) * MAX_LAYERS + i] = head;
                      }
                  }
              face_num = 0;     /* Don't send this object - we'll send the head later */
            }
        }
      else
        {
          /* In this case, we are already at the lower right or single part object,
           * so nothing special 
           */
          face_num = ob->face->number;

          /* clear out any head entries that have the same face as this one */
          for (bx = 0; bx < layer; bx++)
            if (heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + bx] &&
                heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + bx]->face->number == face_num)
              heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + bx] = NULL;
        }
    }                           /* else not already head object or blank face */

  /* This is a real hack.  Basically, if we have nothing to send for this layer,
   * but there is a head on the next layer, send that instead.
   * Without this, what happens is you can get the case where the player stands
   * on the same space as the head.  However, if you have overlapping big objects
   * of the same type, what happens then is it doesn't think it needs to send
   * This tends to make stacking also work/look better.
   */
  if (!face_num && layer > 0 && heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + layer - 1])
    {
      face_num = heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + layer - 1]->face->number;
      heads[(sy * MAX_HEAD_POS + sx) * MAX_LAYERS + layer - 1] = NULL;
    }

  /* Another hack - because of heads and whatnot, this face may match one
   * we already sent for a lower layer.  In that case, don't send
   * this one.
   */
  if (face_num && layer + 1 < MAP_LAYERS && ns.lastmap.cells[sx][sy].faces[layer + 1] == face_num)
    face_num = 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 (ns.lastmap.cells[sx][sy].faces[layer] != face_num)
    {
      ns.lastmap.cells[sx][sy].faces[layer] = face_num;
      if (!(ns.faces_sent[face_num] & NS_FACESENT_FACE))
        esrv_send_face (&ns, face_num, 0);

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

  /* Nothing changed */
  return 0;
}

/**
 * This function is mainly a copy of update_space,
 * except it handles update of the smoothing updates,
 * not the face updates.
 * Removes the need to replicate the same code for each layer.
 * this returns true if this smooth 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 know need to pass the
 * entire player object.
 * mx and my are map coordinate offsets for map mp
 * sx and sy are the offsets into the socket structure that
 * holds the old values.
 * 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.  
 */

static inline int
update_smooth (packet &sl, client_socket &ns, maptile *mp, int mx, int my, int sx, int sy, int layer)
{
  object *ob;
  int smoothlevel;              /* old face_num; */

  ob = GET_MAP_FACE_OBJ (mp, mx, my, 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.
   */
  if (!ob || ob->face == blank_face || MAP_NOSMOOTH (mp))
    smoothlevel = 0;
  else
    {
      smoothlevel = ob->smoothlevel;
      if (smoothlevel && !(ns.faces_sent[ob->face->number] & NS_FACESENT_SMOOTH))
        SendSmooth (&ns, ob->face->number);
    }                           /* else not already head object or blank face */

  /* 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 (smoothlevel > 255)
    smoothlevel = 255;
  else if (smoothlevel < 0)
    smoothlevel = 0;

  if (ns.lastmap.cells[sx][sy].smooth[layer] != smoothlevel)
    {
      ns.lastmap.cells[sx][sy].smooth[layer] = smoothlevel;
      sl << uint8 (smoothlevel);
      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_socket * ns)
{
  int result = 0;

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

/**
 * 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 socket->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, d, startlen, max_x, max_y, oldlen;
  sint16 nx, ny;
  int estartlen, eoldlen;
  uint16 mask, emask;
  uint8 eentrysize;
  uint16 ewhatstart, ewhatflag;
  uint8 extendedinfos;
  maptile *m;

  client_socket &socket = *pl->contr->socket;

  check_map_change (pl->contr);

  packet sl;
  packet esl;

  sl << (socket.mapmode == Map1Cmd ? "map1 " : "map1a ");
  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 ();
    }
  else
    {
      /* suppress compiler warnings */
      ewhatstart = 0;
      ewhatflag = 0;
      estartlen = 0;
    }

  /* Init data to zero */
  memset (heads, 0, sizeof (object *) * MAX_HEAD_POS * MAX_HEAD_POS * MAX_LAYERS);

  /* 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;

  if (socket.mapmode == Map1aCmd)
    {
      max_x += MAX_HEAD_OFFSET;
      max_y += MAX_HEAD_OFFSET;
    }

  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++)
        {

          emask = mask = (ax & 0x3f) << 10 | (ay & 0x3f) << 4;

          /* If this space is out of the normal viewable area, we only check
           * the heads value  ax or ay will only be greater than what
           * the client wants if using the map1a command - this is because
           * if the map1a command is not used, max_x and max_y will be
           * set to lower values.
           */
          if (ax >= socket.mapx || ay >= socket.mapy)
            {
              int i, got_one;

              oldlen = sl.length ();

              sl << uint16 (mask);

              if (check_head (sl, socket, ax, ay, 2)) mask |= 0x4;
              if (check_head (sl, socket, ax, ay, 1)) mask |= 0x2;
              if (check_head (sl, socket, ax, ay, 0)) mask |= 0x1;

              /* If all we are doing is sending 0 (blank) faces, we don't
               * actually need to send that - just the coordinates
               * with no faces tells the client to blank out the
               * space.
               */
              got_one = 0;
              for (i = oldlen + 2; i < sl.length (); i++)
                if (sl[i])
                  got_one = 1;

              if (got_one && (mask & 0xf))
                sl[oldlen + 1] = mask & 0xff;
              else
                {               /*either all faces blank, either no face at all */
                  if (mask & 0xf)       /*at least 1 face, we know it's blank, only send coordinates */
                    sl.reset (oldlen + 2);
                  else
                    sl.reset (oldlen);
                }

              /*What concerns extendinfos, nothing to be done for now
               * (perhaps effects layer later)
               */
              continue;         /* don't do processing below */
            }

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

          d = pl->contr->blocked_los[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 (pl->map, &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, 0, 0, 0, -1);
                }
            }
          else 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;

              if (socket.mapmode == Map1aCmd && have_head (ax, ay))
                {
                  /* Now check to see if any heads need to be sent */

                  if (check_head (sl, socket, ax, ay, 2)) mask |= 0x4;
                  if (check_head (sl, socket, ax, ay, 1)) mask |= 0x2;
                  if (check_head (sl, socket, ax, ay, 0)) mask |= 0x1;

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

                  map_clearcell (&lastcell, 0, 0, 0, count);
                }

              if ((mask & 0xf) || need_send)
                sl[oldlen + 1] = mask & 0xff;
              else
                sl.reset (oldlen);
            }
          else
            {
              /* In this block, the space is visible or there are head objects
               * we need to send.
               */

              /* 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 ();
              mask = (ax & 0x3f) << 10 | (ay & 0x3f) << 4;
              eoldlen = esl.length ();
              emask = (ax & 0x3f) << 10 | (ay & 0x3f) << 4;
              sl << uint16 (mask);

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

              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;

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

                  // send hp information, if applicable
                  if (object *op = GET_MAP_FACE_OBJ (m, nx, ny, 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 (8) << (uint64)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, m, nx, ny, ax, ay, 2))
                mask |= 0x4;

              if (socket.EMI_smooth)
                if (update_smooth (esl, socket, m, nx, ny, ax, ay, 2))
                  emask |= 0x4;

              /* Middle face */
              if (update_space (sl, socket, m, nx, ny, ax, ay, 1))
                mask |= 0x2;

              if (socket.EMI_smooth)
                if (update_smooth (esl, socket, m, nx, ny, ax, ay, 1))
                  emask |= 0x2;

              if (nx == pl->x && ny == pl->y && pl->invisible & (pl->invisible < 50 ? 4 : 1))
                {
                  if (lastcell.faces[0] != pl->face->number)
                    {
                      lastcell.faces[0] = pl->face->number;
                      mask |= 0x1;

                      if (!(socket.faces_sent[pl->face->number] & NS_FACESENT_FACE))
                        esrv_send_face (&socket, pl->face->number, 0);

                      sl << uint16 (pl->face->number);
                    }
                }
              else
                {
                  /* Top face */
                  if (update_space (sl, socket, m, nx, ny, ax, ay, 0))
                    mask |= 0x1;

                  if (socket.EMI_smooth)
                    if (update_smooth (esl, socket, m, nx, ny, ax, ay, 0))
                      emask |= 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 (emask & 0xf)
                esl[eoldlen + 1] = emask & 0xff;
              else
                esl.reset (eoldlen);
            }                   /* else this is a viewable space */
        }                       /* for x loop */
    }                           /* for y loop */

  /* 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, nx, ny;        /* ax and ay goes from 0 to max-size of arrays */
  New_Face *face, *floor;
  New_Face *floor2;
  int d, 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->socket->mapy / 2); j < (pl->y + (pl->contr->socket->mapy + 1) / 2); j++)
    {
      for (i = (pl->x - pl->contr->socket->mapx / 2); i < (pl->x + (pl->contr->socket->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 (mflags & P_NEED_UPDATE)
            update_position (m, ax, ay);
          /* 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->socket->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_socket *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_socket * 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->socket->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->socket->send_packet (sl);
            }
        }
    }
}

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

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

  packet sl;

  sl << "delspell "
     << uint32 (spell->count);

  pl->socket->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 len, 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;
          }
    }

  /* 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 ? spell->face->number : 0)
     << 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->socket->monitor_spells)
    return;

  packet sl;

  sl << "addspell ";

  if (!spell)
    {
      for (spell = pl->ob->inv; spell != NULL; 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->socket->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->socket->send_packet (sl);
}

Revision:	1.37
Committed:	Thu Dec 14 20:39:54 2006 UTC (17 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.36:	+24 -24 lines
Log Message:	- implement c++ interface to Event->io watchers - cut number of write()'s the server does in half