hedgewars/uIO.pas
author unc0rr
Thu, 08 Jan 2009 15:26:12 +0000
changeset 1598 c853e02ed663
parent 1560 e140bc57ff68
child 1639 89b536a3cf3c
permissions -rw-r--r--
- Fix bugs in net server - Frontend disconnection fixes
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004, 2005, 2007, 2008 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 SendIPCTimeInc;
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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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var hiTicks: Word = 0;
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implementation
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uses uConsole, uConsts, uWorld, uMisc, uLand, uChat, uTeams;
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const isPonged: boolean = false;
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type PCmd = ^TCmd;
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     TCmd = packed record
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            Next: PCmd;
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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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var  IPCSock: PTCPSocket = nil;
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     fds: PSDLNet_SocketSet;
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     headcmd: PCmd = nil;
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     lastcmd: PCmd = nil;
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function AddCmd(Time: Longword; str: shortstring): PCmd;
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var Result: PCmd;
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begin
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new(Result);
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FillChar(Result^, sizeof(TCmd), 0);
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Result^.Time:= Time;
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Result^.str:= str;
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if Result^.cmd <> 'F' then dec(Result^.len, 2); // cut timestamp
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if headcmd = nil then
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   begin
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   headcmd:= Result;
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   lastcmd:= Result
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   end else
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   begin
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   lastcmd^.Next:= Result;
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   lastcmd:= Result
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   end;
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AddCmd:= Result
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end;
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procedure RemoveCmd;
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var tmp: PCmd;
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begin
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TryDo(headcmd <> nil, 'Engine bug: headcmd = nil', true);
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tmp:= headcmd;
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headcmd:= headcmd^.Next;
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if headcmd = nil then lastcmd:= nil;
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dispose(tmp)
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end;
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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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var loTicks: Word;
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begin
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case s[1] of
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     '!': begin {$IFDEF DEBUGFILE}AddFileLog('Ping? Pong!');{$ENDIF}isPonged:= true; end;
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     '?': SendIPC('!');
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     '#': inc(hiTicks);
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     'e': ParseCommand(copy(s, 2, Length(s) - 1), true);
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     'E': OutError(copy(s, 2, Length(s) - 1), true);
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     'W': OutError(copy(s, 2, Length(s) - 1), false);
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     'M': CheckLandDigest(s);
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     'T': case s[2] of
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               'L': GameType:= gmtLocal;
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               'D': GameType:= gmtDemo;
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               'N': GameType:= gmtNet;
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               'S': GameType:= gmtSave;
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               else OutError(errmsgIncorrectUse + ' IPC "T" :' + s[2], true) end;
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     else
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     loTicks:= SDLNet_Read16(@s[byte(s[0]) - 1]);
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     AddCmd(hiTicks shl 16 + loTicks, s);
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     {$IFDEF DEBUGFILE}AddFileLog('IPC in: '+s[1]+' ticks '+inttostr(lastcmd^.Time));{$ENDIF}
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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_Write16(GameTicks, @s[Succ(byte(s[0]))]);
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   {$IFDEF DEBUGFILE}AddFileLog('IPC send: '+s[1]);{$ENDIF}
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   inc(s[0], 2);
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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 SendIPCTimeInc;
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const timeinc: shortstring = '#';
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begin
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SendIPCRaw(@timeinc, 2)
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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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	s: shortstring;
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begin
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tmpflag:= true;
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while (headcmd <> nil)
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	and ((GameTicks = headcmd^.Time)
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		or (headcmd^.cmd = 's')
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		or (headcmd^.cmd = 'F')) do
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	begin
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	case headcmd^.cmd of
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		'+': ; // do nothing - it's just empty packet
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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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		's': begin
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			s:= copy(headcmd^.str, 2, Pred(headcmd^.len));
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			AddChatString(s);
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			WriteLnToConsole(s)
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			end;
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		'F': TeamGone(copy(headcmd^.str, 2, Pred(headcmd^.len)));
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		'N': begin
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			tmpflag:= false;
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			{$IFDEF DEBUGFILE}AddFileLog('got cmd "N": time '+inttostr(headcmd^.Time)){$ENDIF}
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			end;
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		'p': begin
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			TargetPoint.X:= SmallInt(SDLNet_Read16(@(headcmd^.X)));
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			TargetPoint.Y:= SmallInt(SDLNet_Read16(@(headcmd^.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(@(headcmd^.X)) + WorldDx);
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			CursorPoint.Y:= SmallInt(SDLNet_Read16(@(headcmd^.Y)) + WorldDy);
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			end;
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		'w': ParseCommand('setweap ' + headcmd^.str[2], true);
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		't': ParseCommand('taunt ' + headcmd^.str[2], true);
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		'1'..'5': ParseCommand('timer ' + headcmd^.cmd, true);
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		#128..char(128 + cMaxSlotIndex): ParseCommand('slot ' + char(byte(headcmd^.cmd) - 79), true)
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		else
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			OutError('Unexpected protocol command: ' + headcmd^.cmd, True)
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		end;
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	RemoveCmd
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	end;
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if (headcmd <> nil) then
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	TryDo(GameTicks < headcmd^.Time,
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			'oops, queue error. in buffer: ' + headcmd^.cmd +
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			' (' + inttostr(GameTicks) + ' > ' +
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			inttostr(headcmd^.Time) + ')',
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			true);
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isInLag:= (headcmd = nil) and tmpflag and not CurrentTeam^.hasGone;
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if isInLag then fastUntilLag:= false
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end;
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end.