(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2004, 2005 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * Distributed under the terms of the BSD-modified licence:

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * with the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO

 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *)

unit uIO;

interface

uses SDLh;

{$INCLUDE options.inc}

const ipcPort: Word = 0;

procedure SendIPC(s: shortstring);

procedure SendIPCAndWaitReply(s: shortstring);

procedure IPCCheckSock;

procedure InitIPC;

procedure CloseIPC;

procedure NetGetNextCmd;

implementation

uses uConsole, uConsts, uWorld, uMisc, uRandom, uLand;

const isPonged: boolean = false;

var  IPCSock: PTCPSocket = nil;

     fds: PSDLNet_SocketSet;

     extcmd: array[word] of packed record

                                   Time: LongWord;

                                   case byte of

                                        1: (len: byte;

                                            cmd: Char;

                                            X, Y: SmallInt);

                                        2: (str: shortstring);

                                   end;

     cmdcurpos: integer = 0;

     cmdendpos: integer = -1;

procedure InitIPC;

var ipaddr: TIPAddress;

begin

WriteToConsole('Init SDL_Net... ');

SDLTry(SDLNet_Init = 0, true);

fds:= SDLNet_AllocSocketSet(1);

SDLTry(fds <> nil, true);

WriteLnToConsole(msgOK);

WriteToConsole('Establishing IPC connection... ');

SDLTry(SDLNet_ResolveHost(ipaddr, '127.0.0.1', ipcPort) = 0, true);

IPCSock:= SDLNet_TCP_Open(ipaddr);

SDLTry(IPCSock <> nil, true);

WriteLnToConsole(msgOK)

end;

procedure CloseIPC;

begin

SDLNet_FreeSocketSet(fds);

SDLNet_TCP_Close(IPCSock);

SDLNet_Quit

end;

procedure ParseIPCCommand(s: shortstring);

begin

case s[1] of

     '!': begin {$IFDEF DEBUGFILE}AddFileLog('Ping? Pong!');{$ENDIF}isPonged:= true; end;

     '?': SendIPC('!');

     'e': ParseCommand(copy(s, 2, Length(s) - 1));

     'E': OutError(copy(s, 2, Length(s) - 1), true);

     'W': OutError(copy(s, 2, Length(s) - 1), false);

     'T': case s[2] of

               'L': GameType:= gmtLocal;

               'D': GameType:= gmtDemo;

               'N': GameType:= gmtNet;

               'S': GameType:= gmtSave;

               else OutError(errmsgIncorrectUse + ' IPC "T" :' + s[2], true) end;

     else

     inc(cmdendpos);

     extcmd[cmdendpos].Time := PLongWord(@s[byte(s[0]) - 3])^;

     extcmd[cmdendpos].str  := s;

     {$IFDEF DEBUGFILE}AddFileLog('IPC in: '+s[1]+' ticks '+inttostr(extcmd[cmdendpos].Time)+' at '+inttostr(cmdendpos));{$ENDIF}

     dec(extcmd[cmdendpos].len, 4)

     end

end;

procedure IPCCheckSock;

const ss: string = '';

var i: integer;

    buf: array[0..255] of byte;

    s: shortstring absolute buf;

begin

fds.numsockets:= 0;

SDLNet_AddSocket(fds, IPCSock);

while SDLNet_CheckSockets(fds, 0) > 0 do

      begin

      i:= SDLNet_TCP_Recv(IPCSock, @buf[1], 255);

      if i > 0 then

         begin

         buf[0]:= i;

         ss:= ss + s;

         while (Length(ss) > 1)and(Length(ss) > byte(ss[1])) do

               begin

               ParseIPCCommand(copy(ss, 2, byte(ss[1])));

               Delete(ss, 1, Succ(byte(ss[1])))

               end

         end else OutError('IPC connection lost', true)

      end;

end;

procedure SendIPC(s: shortstring);

begin

if IPCSock <> nil then

   begin

   if s[0]>#251 then s[0]:= #251;

   PLongWord(@s[Succ(byte(s[0]))])^:= GameTicks;

   {$IFDEF DEBUGFILE}AddFileLog('IPC send: '+s);{$ENDIF}

   inc(s[0],4);

   SDLNet_TCP_Send(IPCSock, @s, Succ(byte(s[0])))

   end

end;

procedure SendIPCAndWaitReply(s: shortstring);

begin

SendIPC(s);

SendIPC('?');

isPonged:= false;

repeat

   IPCCheckSock;

   SDL_Delay(1)

until isPonged

end;

procedure NetGetNextCmd;

var tmpflag: boolean;

begin

while (cmdcurpos <= cmdendpos)and(extcmd[cmdcurpos].cmd = 's') do

      begin

      WriteLnToConsole('> ' + copy(extcmd[cmdcurpos].str, 2, Pred(extcmd[cmdcurpos].len)));

      AddCaption('> ' + copy(extcmd[cmdcurpos].str, 2, Pred(extcmd[cmdcurpos].len)), $FFFFFF, capgrpNetSay);

      inc(cmdcurpos)

      end;

if cmdcurpos <= cmdendpos then

   TryDo(GameTicks <= extcmd[cmdcurpos].Time,

         'oops, queue error. in buffer: ' + extcmd[cmdcurpos].cmd +

         ' (' + inttostr(GameTicks) + ' > ' +

         inttostr(extcmd[cmdcurpos].Time) + ')',

         true);

tmpflag:= true;

while (cmdcurpos <= cmdendpos)and(GameTicks = extcmd[cmdcurpos].Time) do

   begin

   case extcmd[cmdcurpos].cmd of

        'L': ParseCommand('+left');

        'l': ParseCommand('-left');

        'R': ParseCommand('+right');

        'r': ParseCommand('-right');

        'U': ParseCommand('+up');

        'u': ParseCommand('-up');

        'D': ParseCommand('+down');

        'd': ParseCommand('-down');

        'A': ParseCommand('+attack');

        'a': ParseCommand('-attack');

        'S': ParseCommand('switch');

        'j': ParseCommand('ljump');

        'J': ParseCommand('hjump');

        ',': ParseCommand('skip');

        'N': begin

             tmpflag:= false;

             {$IFDEF DEBUGFILE}AddFileLog('got cmd "N": time '+inttostr(extcmd[cmdcurpos].Time)){$ENDIF}

             end;

        'p': begin

             TargetPoint.X:= extcmd[cmdcurpos].X;

             TargetPoint.Y:= extcmd[cmdcurpos].Y;

             ParseCommand('put')

             end;

        'P': begin

             CursorPoint.X:= extcmd[cmdcurpos].X + WorldDx;

             CursorPoint.Y:= extcmd[cmdcurpos].Y + WorldDy;

             end;

        '1'..'5': ParseCommand('timer ' + extcmd[cmdcurpos].cmd);

        end;

   inc(cmdcurpos)

   end;

isInLag:= (cmdcurpos > cmdendpos) and tmpflag

end;

end.