server/socket/request.C

/*
 * static char *rcsid_init_c =
 *    "$Id: request.C,v 1.6 2006-08-19 03:54:23 root Exp $";
 */

/*
    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-devel@real-time.com
*/

/**
 * \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
 *
 * esrv_map_doneredraw finishes the map update, and ships across the
 * map updates. 
 *
 * esrv_map_scroll tells the client to scroll the map, and does similarily
 * for the locally cached copy.
 */

#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.
 */
#ifndef WIN32 /* ---win32 exclude unix headers */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#endif /* win32 */

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

    {
      char buf[MAXSOCKBUF];

      sprintf(buf,"map_scroll %d %d", dx, dy);
      Write_String_To_Socket(ns, buf, strlen (buf));
    }

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

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

  if (socket.newmapcmd == 1)
    Write_String_To_Socket (&socket, "newmap", 6);

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

/** check for map change and send new map data */
static void
check_map_change (player *pl)
{
  NewSocket &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");

          Write_String_To_Socket (&socket, buf, strlen (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)
{
  execute_global_event (EVENT_EXTCMD, pl, 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], *cp, *token;

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

  *buf++ = 0;

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

      // initial map and its origin
      mapstruct *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);
  
  Write_String_To_Socket (&pl->socket, bigbuf, strlen (bigbuf));
}

/** This is the Setup cmd - easy first implementation */
void SetUp(char *buf, int len, NewSocket *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);
    Write_String_To_Socket(ns, cmdback, strlen(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, NewSocket *ns)
{
    Settings oldsettings;
    oldsettings=settings;
    if (ns->status != Ns_Add || add_player(ns)) {               
        Write_String_To_Socket(ns, "addme_failed",12);
    } else {
        /* Basically, the add_player copies the socket structure into
         * the player structure, so this one (which is from init_sockets)
         * is not needed anymore.  The write below should still work, as the
         * stuff in ns is still relevant.
         */
        Write_String_To_Socket(ns, "addme_success",13);
        socket_info.nconns--;
        ns->status = Ns_Avail;
    }
    settings=oldsettings;       
}

/** Reply to ExtendedInfos command */
void ToggleExtendedInfos (char *buf, int len, NewSocket *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);
          command[nextinfo-info]='\0';
          /* 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");
     }
     Write_String_To_Socket(ns, cmdback,strlen(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, NewSocket *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);
        }
     Write_String_To_Socket(ns, cmdback,strlen(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(NewSocket *ns, uint16 face) {
     uint16 smoothface;
     unsigned char reply[MAX_BUF];
     SockList sl;

    /* 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;

    sl.buf=reply;
    strcpy((char*)sl.buf,"smooth ");
    sl.len=strlen((char*)sl.buf);
    SockList_AddShort(&sl, face);
    SockList_AddShort(&sl, smoothface);
    Send_With_Handling(ns, &sl);
}

 /**
  * Tells client the picture it has to use 
  * to smooth a picture number given as argument.
  */
void AskSmooth (char *buf, int len, NewSocket *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;
    short packet;
    unsigned char command[MAX_BUF];
    SockList sl;

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

    packet = GetShort_String(buf);
    repeat = GetInt_String(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;

    /* Send confirmation of command execution now */
    sl.buf = command;
    strcpy((char*)sl.buf,"comc ");
    sl.len=5;
    SockList_AddShort(&sl,packet);
    if (FABS(pl->ob->speed) < 0.001) time=MAX_TIME * 100;
    else
        time = ( int )( MAX_TIME/ FABS(pl->ob->speed) );
    SockList_AddInt(&sl,time);
    Send_With_Handling(&pl->socket, &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,NewSocket *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(!strcmp(" CF DX CLIENT", cp) || ns->sc_version < 1024 )
        {
            sprintf(version_warning,"drawinfo %d %s", NDI_RED, "**** VERSION WARNING ****\n**** CLIENT IS TOO OLD!! UPDATE THE CLIENT!! ****");
            Write_String_To_Socket(ns, version_warning, strlen(version_warning));
        }

    }
}

/** sound related functions. */
 
void SetSound(char *buf, int len, NewSocket *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(NewSocket *ns, uint8 flags, char *text)
{
    char buf[MAX_BUF];

    sprintf(buf,"query %d %s", flags, text?text:"");
    Write_String_To_Socket(ns, buf, strlen(buf));
}

#define AddIfInt64(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        SockList_AddChar(&sl, Type); \
                        SockList_AddInt64(&sl, New); \
                       }

#define AddIfInt(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        SockList_AddChar(&sl, Type); \
                        SockList_AddInt(&sl, New); \
                       }

#define AddIfShort(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        SockList_AddChar(&sl, Type); \
                        SockList_AddShort(&sl, New); \
                       }

#define AddIfFloat(Old,New,Type) if (Old != New) {\
                        Old = New; \
                        SockList_AddChar(&sl, Type); \
                        SockList_AddInt(&sl,(long)(New*FLOAT_MULTI));\
                        }

#define AddIfString(Old,New,Type) if (Old == NULL || strcmp(Old,New)) {\
                        if (Old) free(Old);\
                        Old = strdup_local(New);\
                        SockList_AddChar(&sl, Type); \
                        SockList_AddChar(&sl, ( char )strlen(New)); \
                        strcpy((char*)sl.buf + sl.len, New); \
                        sl.len += strlen(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)
{
    SockList sl;
    char buf[MAX_BUF];
    uint16 flags;

    sl.buf=(unsigned char*)malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf,"stats ");
    sl.len=strlen((char*)sl.buf);
    
    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.
                 */
                SockList_AddChar(&sl, ( char )( s + CS_STAT_SKILLINFO ));
                SockList_AddChar(&sl, ( char )pl->last_skill_ob[s]->level);
                SockList_AddInt64(&sl, 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.len>6) {
#ifdef ESRV_DEBUG
        LOG(llevDebug,"Sending stats command, %d bytes long.\n", sl.len);
#endif
        Send_With_Handling(&pl->socket, &sl);
    }
    free(sl.buf);
}


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

    pl->last_weight = weight;

    sl.buf=(unsigned char*)malloc(MAXSOCKBUF);

    strcpy((char*)sl.buf,"player ");
    sl.len=strlen((char*)sl.buf);
    SockList_AddInt(&sl, pl->ob->count);
    SockList_AddInt(&sl, weight);
    SockList_AddInt(&sl, pl->ob->face->number);

    SockList_AddChar(&sl, ( char )strlen(pl->ob->name));
    strcpy((char*)sl.buf+sl.len, pl->ob->name);
    sl.len += strlen(pl->ob->name);
       
    Send_With_Handling(&pl->socket, &sl);
    free(sl.buf);
    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(NewSocket *ns, short anim_num)
{
    SockList sl;
    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;
    }

    sl.buf = (unsigned char*) malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf, "anim ");
    sl.len=5;
    SockList_AddShort(&sl, anim_num);
    SockList_AddShort(&sl, 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);
        SockList_AddShort(&sl, animations[anim_num].faces[i]);  /* flags - not used right now */
    }
    Send_With_Handling(ns, &sl);
    free(sl.buf);
    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(NewSocket *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(NewSocket *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(NewSocket *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;
}

static void esrv_map_doneredraw(NewSocket *ns, struct Map *newmap)
{
    static long frames,bytes,tbytes,tframes;
    char *cur;
    SockList sl;


    sl.buf=(unsigned char*)malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf,"map ");
    sl.len=strlen((char*)sl.buf);

    cur = (char *) compactlayer(ns,(unsigned char*) sl.buf+sl.len,MAP_LAYERS,newmap);
    sl.len=cur-(char*)sl.buf;

/*    LOG(llevDebug, "Sending map command.\n");*/

    if (sl.len>( int )strlen("map ") || ns->sent_scroll) {
        /* All of this is just accounting stuff */
        if (tframes>100) {
            tframes = tbytes = 0;
        }
        tframes++;
        frames++;
        tbytes += sl.len;
        bytes += sl.len;
        memcpy(&ns->lastmap,newmap,sizeof(struct Map));
        Send_With_Handling(ns, &sl);
        ns->sent_scroll = 0;
    }
    free(sl.buf);
}


/** 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;
}

#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 (SockList &sl, NewSocket &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]) {
        SockList_AddShort (&sl, 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(SockList *sl, NewSocket *ns, mapstruct  *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);
        SockList_AddShort(sl, 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(SockList *sl, NewSocket *ns, mapstruct  *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;
        SockList_AddChar(sl, (uint8) (smoothlevel&0xFF));
        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(NewSocket* 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;
    SockList sl;
    SockList esl; /*For extended Map info*/
    uint16  mask,emask;
    uint8 eentrysize;
    uint16  ewhatstart,ewhatflag;
    uint8   extendedinfos;
    mapstruct *m;
    NewSocket &socket = pl->contr->socket;

    check_map_change (pl->contr);

    sl.buf=(unsigned char*)malloc(MAXSOCKBUF);
    if (socket.mapmode == Map1Cmd)
        strcpy((char*)sl.buf,"map1 ");
    else
        strcpy((char*)sl.buf,"map1a ");
    sl.len=strlen((char*)sl.buf);
    startlen = sl.len;
    /*Extendedmapinfo structure initialisation*/
    if (socket.ext_mapinfos){
        esl.buf=(unsigned char*)malloc(MAXSOCKBUF);
        strcpy((char*)esl.buf,"mapextended ");
        esl.len=strlen((char*)esl.buf);
        extendedinfos=EMI_NOREDRAW;
        if (socket.EMI_smooth)
            extendedinfos|=EMI_SMOOTH;
        ewhatstart=esl.len;
        ewhatflag=extendedinfos; /*The EMI_NOREDRAW bit
                                   could need to be taken away*/
        SockList_AddChar(&esl, extendedinfos);
        eentrysize=getExtendedMapInfoSize(&socket);
        SockList_AddChar(&esl, eentrysize);
        estartlen = esl.len;
    } 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.len;

                SockList_AddShort(&sl, 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.len; i++) {
                    if (sl.buf[i]) got_one=1;
                }

                if (got_one && (mask & 0xf)) {
                    sl.buf[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.len = oldlen + 2;
                  else
                      sl.len = 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) {
                    SockList_AddShort(&sl, 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.len;

                SockList_AddShort(&sl, 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 {
                    struct MapCell *cell = &lastcell;
                    /* properly clear a previously sent big face */
                    if(cell->faces[0] != 0
                    || cell->faces[1] != 0
                    || cell->faces[2] != 0)
                        need_send = 1;
                    map_clearcell(&lastcell, 0, 0, 0, count);
                }

                if ((mask & 0xf) || need_send) {
                    sl.buf[oldlen+1] = mask & 0xff;
                } else {
                    sl.len = 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.len 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.len;
                mask = (ax & 0x3f) << 10 | (ay & 0x3f) << 4;
                eoldlen = esl.len;
                emask = (ax & 0x3f) << 10 | (ay & 0x3f) << 4;
                SockList_AddShort(&sl, mask);

                if (socket.ext_mapinfos)
                    SockList_AddShort(&esl, 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.buf + sl.len; SockList_AddChar (&sl, d);
                      }
                    else
                      SockList_AddChar (&sl, 255 - 64 * d);
                }

                lastcell.count = d;

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

                    // send hp information, if applicable
                    if (object *op = GET_MAP_FACE_OBJ (m, nx, ny, 0))
                      if (!op->head
                          && op->stats.maxhp > 0
                          && (unsigned)op->stats.maxhp > (unsigned)op->stats.hp
                          && IS_LIVE (op))
                        {
                          stat_hp    = 255 - (op->stats.hp * 255 + 254) / op->stats.maxhp;
                          stat_width = op->arch->tail_x;
                        }

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

                        mask |= 0x8;
                        *last_ext |= 0x80; last_ext = sl.buf + sl.len; SockList_AddChar (&sl, 5);
                        SockList_AddChar (&sl, stat_hp);

                        if (stat_width > 1)
                          {
                            *last_ext |= 0x80; last_ext = sl.buf + sl.len; SockList_AddChar (&sl, 6);
                            SockList_AddChar (&sl, stat_width);
                          }
                      }
                  }

                /* 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);
                        SockList_AddShort(&sl, pl->face->number);
                    }
                }
                /* Top face */
                else {
                    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.buf[oldlen+1] = mask & 0xff;
                } else {
                    sl.len = oldlen;
                }
                if (emask & 0xf) {
                    esl.buf[eoldlen+1] = emask & 0xff;
                } else {
                    esl.len = 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.len>startlen || socket.sent_scroll)){
            /* No map data will follow, so don't say the client
             * it doesn't need draw!
             */
            ewhatflag&=(~EMI_NOREDRAW);
            esl.buf[ewhatstart+1] = ewhatflag & 0xff;
        }
        if (esl.len>estartlen) {
            Send_With_Handling(&socket, &esl);
        }
        free(esl.buf);
    }
    if (sl.len>startlen || socket.sent_scroll) {
        Send_With_Handling(&socket, &sl);
        socket.sent_scroll = 0;
    }
    free(sl.buf);
}

/**
 * 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;
    mapstruct   *m, *pm;

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

    if (pl->contr->transport) {
        pm = pl->contr->transport->map;
    }
    else
        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;
    }

    if (pl->contr->socket.mapmode == Map1Cmd || pl->contr->socket.mapmode == Map1aCmd) {
        /* Big maps need a different drawing mechanism to work */
        draw_client_map1(pl);
        return;
    }
    
    if(pl->invisible & (pl->invisible < 50 ? 4 : 1)) {
        esrv_map_setbelow(&pl->contr->socket,pl->contr->socket.mapx/2,
                          pl->contr->socket.mapy/2,pl->face->number,&newmap);
    }

    /* j and i are the y and x coordinates of the real map (which is 
     * basically some number of spaces around the player)
     * ax and ay are values from within the viewport (ie, 0, 0 is upper
     * left corner) and are thus disconnected from the map values.
     * Subtract 1 from the max values so that we properly handle cases where
     * player has specified an even map.  Otherwise, we try to send them too
     * much, ie, if mapx is 10, we would try to send from -5 to 5, which is actually
     * 11 spaces.  Now, we would send from -5 to 4, which is properly.  If mapx is
     * odd, this still works fine.
     */
    ay=0;
    for(j=pl->y-pl->contr->socket.mapy/2; j<=pl->y+(pl->contr->socket.mapy-1)/2;j++, ay++) {
        ax=0;
        for(i=pl->x-pl->contr->socket.mapx/2;i<=pl->x+(pl->contr->socket.mapx-1)/2;i++, ax++) {

            d =  pl->contr->blocked_los[ax][ay];
            /* note the out_of_map and d>3 checks are both within the same
             * negation check.
             */
            nx = i;
            ny = j;
            m = get_map_from_coord(pm, &nx, &ny);
            if (m && d<4) {
                face = GET_MAP_FACE(m, nx, ny,0);
                floor2 = GET_MAP_FACE(m, nx, ny,1);
                floor = GET_MAP_FACE(m, nx, ny,2);

                /* If all is blank, send a blank face. */
                if ((!face || face == blank_face) &&
                    (!floor2 || floor2 == blank_face) &&
                    (!floor || floor == blank_face)) {
                        esrv_map_setbelow(&pl->contr->socket,ax,ay,
                                blank_face->number,&newmap);
                } else { /* actually have something interesting */
                  /* send the darkness mask, if any. */
                  if (d && pl->contr->socket.darkness) 
                    esrv_map_setbelow(&pl->contr->socket,ax,ay,
                                                  dark_faces[d-1]->number,&newmap);

                    if (face && face != blank_face)
                        esrv_map_setbelow(&pl->contr->socket,ax,ay,
                                          face->number,&newmap);
                    if (floor2 && floor2 != blank_face)
                        esrv_map_setbelow(&pl->contr->socket,ax,ay,
                                floor2->number,&newmap);
                    if (floor && floor != blank_face)
                        esrv_map_setbelow(&pl->contr->socket,ax,ay,
                                          floor->number,&newmap);
                } 
            } /* Is a valid space */
        }
    }
    esrv_map_doneredraw(&pl->contr->socket, &newmap);

    check_map_change (pl->contr);
}


/*****************************************************************************/
/* 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)
{
    cs_write_string(&pl->contr->socket,buf,strlen(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(NewSocket *ns, char *params)
{
    SockList sl;
    int i;

    sl.buf = (unsigned char*) malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf,"replyinfo skill_info\n");
    for (i=1; i< NUM_SKILLS; i++) {
        sprintf((char*)sl.buf + strlen((char*)sl.buf), "%d:%s\n", i + CS_STAT_SKILLINFO,
                skill_names[i]);
    }
    sl.len = strlen((char*)sl.buf);
    if (sl.len >= MAXSOCKBUF) {
        LOG(llevError,"Buffer overflow in send_skill_info!\n");
        fatal(0);
    }
    Send_With_Handling(ns, &sl);
    free(sl.buf);
}

/**
 * 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 (NewSocket *ns, char *params) {
    SockList sl;
    int i;

    sl.buf = (unsigned char*) malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf,"replyinfo spell_paths\n");
    for(i=0; i<NRSPELLPATHS; i++)
        sprintf((char*)sl.buf + strlen((char*)sl.buf), "%d:%s\n", 1<<i, spellpathnames[i]);
    sl.len = strlen((char*)sl.buf);
    if (sl.len >= MAXSOCKBUF) {
        LOG(llevError,"Buffer overflow in send_spell_paths!\n");
        fatal(0);
    }
    Send_With_Handling(ns, &sl);
    free(sl.buf);
}

/**
 * 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) {
    SockList sl;
    int flags=0;
    object *spell;
    if (!pl->socket.monitor_spells) return;
    for (spell=pl->ob->inv; spell!=NULL; spell=spell->below) {
        if (spell->type == SPELL) {
            /* 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 !=0) {
                sl.buf =(unsigned char*) malloc(MAXSOCKBUF);
                strcpy((char*)sl.buf,"updspell ");
                sl.len=strlen((char*)sl.buf);
                SockList_AddChar(&sl, flags);
                SockList_AddInt(&sl, spell->count);
                if (flags & UPD_SP_MANA) SockList_AddShort(&sl, spell->last_sp);
                if (flags & UPD_SP_GRACE) SockList_AddShort(&sl, spell->last_grace);
                if (flags & UPD_SP_DAMAGE) SockList_AddShort(&sl, spell->last_eat);
                flags = 0;
                Send_With_Handling(&pl->socket, &sl);
                free(sl.buf);
            }
        }
    }
}

void esrv_remove_spell(player *pl, object *spell) {
    SockList sl;

    if (!pl->socket.monitor_spells) return;
    if (!pl || !spell || spell->env != pl->ob) {
        LOG(llevError, "Invalid call to esrv_remove_spell");
        return;
    }
    sl.buf = (unsigned char*) malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf,"delspell ");
    sl.len=strlen((char*)sl.buf);
    SockList_AddInt(&sl, spell->count);
    Send_With_Handling(&pl->socket, &sl);
    free(sl.buf);
}

/* appends the spell *spell to the Socklist we will send the data to. */
static void append_spell (player *pl, SockList *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;
    }
    SockList_AddInt(sl, spell->count);
    SockList_AddShort(sl, spell->level);
    SockList_AddShort(sl, spell->casting_time);
    /* 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);
    /* send the current values */
    SockList_AddShort(sl, spell->last_sp);
    SockList_AddShort(sl, spell->last_grace);
    SockList_AddShort(sl, spell->last_eat);

    /* 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;
            }
    }
    SockList_AddChar(sl, skill);

    SockList_AddInt(sl, spell->path_attuned);
    SockList_AddInt(sl, (spell->face)?spell->face->number:0);

    len = strlen(spell->name);
    SockList_AddChar(sl, (char)len);
    memcpy(sl->buf+sl->len, spell->name, len);
    sl->len+=len;

    if (!spell->msg) {
        SockList_AddShort(sl, 0);
    }
    else {
        len = strlen(spell->msg);
        SockList_AddShort(sl, len);
        memcpy(sl->buf+sl->len, spell->msg, len);
        sl->len+=len;
    }
}

/**
 * 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) {
    SockList sl;
    if (!pl) {
        LOG(llevError, "esrv_add_spells, tried to add a spell to a NULL player");
        return;
    }
    if (!pl->socket.monitor_spells) return;
    sl.buf = (unsigned char*) malloc(MAXSOCKBUF);
    strcpy((char*)sl.buf,"addspell ");
    sl.len=strlen((char*)sl.buf);
    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.len >= (MAXSOCKBUF - (26 + strlen(spell->name) + 
                                (spell->msg?strlen(spell->msg):0)))) {
                Send_With_Handling(&pl->socket, &sl);
                strcpy((char*)sl.buf,"addspell ");
                sl.len=strlen((char*)sl.buf);
            }
            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.len >= MAXSOCKBUF) {
        LOG(llevError,"Buffer overflow in esrv_add_spells!\n");
        fatal(0);
    }
    /* finally, we can send the packet */
    Send_With_Handling(&pl->socket, &sl);
    free(sl.buf);
}

Revision:	1.7
Committed:	Mon Aug 21 07:13:32 2006 UTC (17 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+29 -10 lines
Log Message:	workaorund for client mapscroll overflow