hedgewars/uIO.pas
author unc0rr
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(*
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 * Hedgewars, a worms-like game
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 * Copyright (c) 2004, 2005 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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unit uIO;
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interface
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uses SDLh;
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{$INCLUDE options.inc}
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const ipcPort: Word = 0;
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procedure SendIPC(s: shortstring);
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procedure SendIPCXY(cmd: char; X, Y: SmallInt);
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procedure SendIPCRaw(p: pointer; len: Longword);
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procedure SendIPCAndWaitReply(s: shortstring);
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procedure IPCWaitPongEvent;
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procedure IPCCheckSock;
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procedure InitIPC;
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procedure CloseIPC;
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procedure NetGetNextCmd;
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implementation
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uses uConsole, uConsts, uWorld, uMisc, uLand;
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const isPonged: boolean = false;
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      MAXCMDS = 65535;
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var  IPCSock: PTCPSocket = nil;
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     fds: PSDLNet_SocketSet;
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     extcmd: array[0..MAXCMDS] of packed record
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                                   Time: LongWord;
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                                   case byte of
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                                        1: (len: byte;
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                                            cmd: Char;
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                                            X, Y: SmallInt);
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                                        2: (str: shortstring);
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                                   end;
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     cmdcurpos: LongInt = 0;
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     cmdendpos: LongInt = -1;
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procedure InitIPC;
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var ipaddr: TIPAddress;
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begin
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WriteToConsole('Init SDL_Net... ');
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SDLTry(SDLNet_Init = 0, true);
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fds:= SDLNet_AllocSocketSet(1);
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SDLTry(fds <> nil, true);
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WriteLnToConsole(msgOK);
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WriteToConsole('Establishing IPC connection... ');
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SDLTry(SDLNet_ResolveHost(ipaddr, '127.0.0.1', ipcPort) = 0, true);
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IPCSock:= SDLNet_TCP_Open(ipaddr);
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SDLTry(IPCSock <> nil, true);
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WriteLnToConsole(msgOK)
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end;
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procedure CloseIPC;
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begin
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SDLNet_FreeSocketSet(fds);
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SDLNet_TCP_Close(IPCSock);
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SDLNet_Quit
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end;
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procedure ParseIPCCommand(s: shortstring);
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begin
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case s[1] of
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     '!': begin {$IFDEF DEBUGFILE}AddFileLog('Ping? Pong!');{$ENDIF}isPonged:= true; end;
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     '?': SendIPC('!');
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     'e': ParseCommand(copy(s, 2, Length(s) - 1), true);
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     'E': OutError(copy(s, 2, Length(s) - 1), true);
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     'W': OutError(copy(s, 2, Length(s) - 1), false);
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     'M': CheckLandDigest(s);
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     'T': case s[2] of
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               'L': GameType:= gmtLocal;
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               'D': GameType:= gmtDemo;
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               'N': GameType:= gmtNet;
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               'S': GameType:= gmtSave;
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               else OutError(errmsgIncorrectUse + ' IPC "T" :' + s[2], true) end;
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     else
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     inc(cmdendpos);
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     TryDo(cmdendpos <= MAXCMDS, 'Too many commands in queue', true);
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     extcmd[cmdendpos].Time := SDLNet_Read32(@s[byte(s[0]) - 3]);
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     extcmd[cmdendpos].str  := s;
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     {$IFDEF DEBUGFILE}AddFileLog('IPC in: '+s[1]+' ticks '+inttostr(extcmd[cmdendpos].Time)+' at '+inttostr(cmdendpos));{$ENDIF}
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     dec(extcmd[cmdendpos].len, 4)
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     end
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end;
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procedure IPCCheckSock;
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const ss: string = '';
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var i: LongInt;
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    buf: array[0..255] of byte;
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    s: shortstring absolute buf;
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begin
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fds^.numsockets:= 0;
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SDLNet_AddSocket(fds, IPCSock);
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while SDLNet_CheckSockets(fds, 0) > 0 do
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      begin
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      i:= SDLNet_TCP_Recv(IPCSock, @buf[1], 255 - Length(ss));
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      if i > 0 then
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         begin
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         buf[0]:= i;
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         ss:= ss + s;
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         while (Length(ss) > 1)and(Length(ss) > byte(ss[1])) do
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               begin
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               ParseIPCCommand(copy(ss, 2, byte(ss[1])));
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               Delete(ss, 1, Succ(byte(ss[1])))
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               end
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         end else OutError('IPC connection lost', true)
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      end;
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end;
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procedure SendIPC(s: shortstring);
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begin
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if IPCSock <> nil then
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   begin
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   if s[0]>#251 then s[0]:= #251;
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   SDLNet_Write32(GameTicks, @s[Succ(byte(s[0]))]);
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   {$IFDEF DEBUGFILE}AddFileLog('IPC send: '+s);{$ENDIF}
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   inc(s[0],4);
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   SDLNet_TCP_Send(IPCSock, @s, Succ(byte(s[0])))
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   end
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end;
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procedure SendIPCRaw(p: pointer; len: Longword);
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begin
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if IPCSock <> nil then
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   begin
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   SDLNet_TCP_Send(IPCSock, p, len)
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   end
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end;
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procedure SendIPCXY(cmd: char; X, Y: SmallInt);
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var s: shortstring;
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begin
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s[0]:= #5;
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s[1]:= cmd;
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SDLNet_Write16(X, @s[2]);
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SDLNet_Write16(Y, @s[4]);
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SendIPC(s)
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end;
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procedure IPCWaitPongEvent;
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begin
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isPonged:= false;
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repeat
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   IPCCheckSock;
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   SDL_Delay(1)
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until isPonged
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end;
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procedure SendIPCAndWaitReply(s: shortstring);
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begin
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SendIPC(s);
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SendIPC('?');
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IPCWaitPongEvent
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end;
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procedure NetGetNextCmd;
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var tmpflag: boolean;
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begin
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while (cmdcurpos <= cmdendpos)and(extcmd[cmdcurpos].cmd = 's') do
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      begin
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      WriteLnToConsole('> ' + copy(extcmd[cmdcurpos].str, 2, Pred(extcmd[cmdcurpos].len)));
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      AddCaption('> ' + copy(extcmd[cmdcurpos].str, 2, Pred(extcmd[cmdcurpos].len)), $FFFFFF, capgrpNetSay);
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      inc(cmdcurpos)
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      end;
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if cmdcurpos <= cmdendpos then
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   TryDo(GameTicks <= extcmd[cmdcurpos].Time,
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         'oops, queue error. in buffer: ' + extcmd[cmdcurpos].cmd +
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         ' (' + inttostr(GameTicks) + ' > ' +
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         inttostr(extcmd[cmdcurpos].Time) + ')',
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         true);
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tmpflag:= true;
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while (cmdcurpos <= cmdendpos)and(GameTicks = extcmd[cmdcurpos].Time) do
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   begin
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   case extcmd[cmdcurpos].cmd of
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        'L': ParseCommand('+left', true);
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        'l': ParseCommand('-left', true);
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        'R': ParseCommand('+right', true);
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        'r': ParseCommand('-right', true);
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        'U': ParseCommand('+up', true);
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        'u': ParseCommand('-up', true);
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        'D': ParseCommand('+down', true);
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        'd': ParseCommand('-down', true);
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        'A': ParseCommand('+attack', true);
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        'a': ParseCommand('-attack', true);
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        'S': ParseCommand('switch', true);
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        'j': ParseCommand('ljump', true);
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        'J': ParseCommand('hjump', true);
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        ',': ParseCommand('skip', true);
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        'N': begin
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             tmpflag:= false;
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             {$IFDEF DEBUGFILE}AddFileLog('got cmd "N": time '+inttostr(extcmd[cmdcurpos].Time)){$ENDIF}
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             end;
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        'p': begin
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             TargetPoint.X:= SmallInt(SDLNet_Read16(@extcmd[cmdcurpos].X));
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             TargetPoint.Y:= SmallInt(SDLNet_Read16(@extcmd[cmdcurpos].Y));
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             ParseCommand('put', true)
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             end;
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        'P': begin
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             CursorPoint.X:= SmallInt(SDLNet_Read16(@extcmd[cmdcurpos].X) + WorldDx);
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             CursorPoint.Y:= SmallInt(SDLNet_Read16(@extcmd[cmdcurpos].Y) + WorldDy);
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             end;
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        '1'..'5': ParseCommand('timer ' + extcmd[cmdcurpos].cmd, true);
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        #128..char(128 + cMaxSlotIndex): ParseCommand('slot ' + char(byte(extcmd[cmdcurpos].cmd) - 79), true)
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        end;
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   inc(cmdcurpos)
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   end;
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isInLag:= (cmdcurpos > cmdendpos) and tmpflag
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end;
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end.