server.cpp

SFC游戏模拟器 snes9x 1.43 的原代码

/*******************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 
  (c) Copyright 1996 - 2002 Gary Henderson ([e-mail]) and
                            Jerremy Koot ([e-mail])

  (c) Copyright 2001 - 2004 John Weidman ([e-mail])

  (c) Copyright 2002 - 2004 Brad Jorsch ([e-mail]),
                            funkyass ([e-mail]),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley ([e-mail]),
                            Matthew Kendora,
                            Nach ([e-mail]),
                            Peter Bortas ([e-mail]) and
                            zones ([e-mail])

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003 zsKnight ([e-mail]),
                            _Demo_ ([e-mail]), and Nach

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar ([e-mail]), _Demo_, Gary Henderson,
                            John Weidman, neviksti ([e-mail]),
                            Kris Bleakley, Andreas Naive

  DSP-2 emulator code
  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
                     Lord Nightmare ([e-mail]

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault ([e-mail]) and
                            Kris Bleakley
  Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code
  (c) Copyright 2002 Matthew Kendora with research by
                     zsKnight, John Weidman, and Dark Force

  S-DD1 C emulator code
  (c) Copyright 2003 Brad Jorsch with research by
                     Andreas Naive and John Weidman
 
  S-RTC C emulator code
  (c) Copyright 2001 John Weidman
  
  ST010 C++ emulator code
  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora

  Super FX x86 assembler emulator code 
  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 

  Super FX C emulator code 
  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman


  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004 Marcus Comstedt ([e-mail]) 

 
  Specific ports contains the works of other authors. See headers in
  individual files.
 
  Snes9x homepage: http://www.snes9x.com
 
  Permission to use, copy, modify and distribute Snes9x in both binary and
  source form, for non-commercial purposes, is hereby granted without fee,
  providing that this license information and copyright notice appear with
  all copies and any derived work.
 
  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software.
 
  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes
  charging money for Snes9x or software derived from Snes9x.
 
  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.
 
  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
*******************************************************************************/

#ifdef NETPLAY_SUPPORT
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <memory.h>
#include <sys/types.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#ifndef __WIN32__
#include <unistd.h>
#include <sys/time.h>
#endif

#ifdef __WIN32__

#include <winsock.h>
#include <process.h>
#define ioctl ioctlsocket
#define close closesocket
#define read(a,b,c) recv(a, b, c, 0)
#define write(a,b,c) send(a, b, c, 0)
#define gettimeofday(a,b) S9xGetTimeOfDay (a)
#define exit(a) _endthread()
void S9xGetTimeOfDay (struct timeval *n);
#else

#include <netdb.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>

#ifdef __SVR4
#include <sys/stropts.h>
#endif

#endif // !__WIN32__

#include "snes9x.h"
#include "netplay.h"
#include "memmap.h"
#include "snapshot.h"

#define NP_ONE_CLIENT 1

struct SNPServer NPServer;

extern unsigned long START;

void S9xNPSendToAllClients (uint8 *data, int len);
bool8 S9xNPLoadFreezeFile (const char *fname, uint8 *&data, uint32 &len);
void S9xNPSendFreezeFile (int c, uint8 *data, uint32 len);
void S9xNPNoClientReady (int start_index = NP_ONE_CLIENT);
void S9xNPRecomputePause ();
void S9xNPWaitForEmulationToComplete ();
void S9xNPSendROMImageToAllClients ();
bool8 S9xNPSendROMImageToClient (int client);
void S9xNPSendSRAMToClient (int c);
void S9xNPSendSRAMToAllClients ();
void S9xNPSyncClient (int);
void S9xNPSendROMLoadRequest (const char *filename);
void S9xNPSendFreezeFileToAllClients (const char *filename);
void S9xNPStopServer ();

void S9xNPShutdownClient (int c, bool8 report_error = FALSE)
{
    if (NPServer.Clients [c].Connected)
    {
        NPServer.Clients [c].Connected = FALSE;
        NPServer.Clients [c].SaidHello = FALSE;

        close (NPServer.Clients [c].Socket);
#ifdef NP_DEBUG
        printf ("SERVER: Player %d disconnecting @%ld\n", c + 1, S9xGetMilliTime () - START);
#endif
        if (report_error)
        {
            sprintf (NetPlay.ErrorMsg, 
                     "Player %d on '%s' has disconnected.", c + 1,
                     NPServer.Clients [c].HostName);
            S9xNPSetError (NetPlay.ErrorMsg);
        }

        if (NPServer.Clients [c].HostName)
        {
            free ((char *) NPServer.Clients [c].HostName);
            NPServer.Clients [c].HostName = NULL;
        }
        if (NPServer.Clients [c].ROMName)
        {
            free ((char *) NPServer.Clients [c].ROMName);
            NPServer.Clients [c].ROMName = NULL;
        }
        if (NPServer.Clients [c].Who)
        {
            free ((char *) NPServer.Clients [c].Who);
            NPServer.Clients [c].Who = NULL;
        }
        NPServer.Joypads [c] = 0;
        NPServer.NumClients--;
        S9xNPRecomputePause ();
    }
}

static bool8 S9xNPSGetData (int socket, uint8 *data, int length)
{
    int len = length;
    uint8 *ptr = data;

    do
    {
        int num_bytes = len;

        // Read the data in small chunks, allowing this thread to spot an
        // abort request from another thread.
        if (num_bytes > 512)
            num_bytes = 512;

        int got = read (socket, (char *) ptr, num_bytes);
        if (got < 0)
        {
	    if (errno == EINTR
#ifdef EAGAIN
		|| errno == EAGAIN
#endif
#ifdef EWOULDBLOCK
		|| errno == EWOULDBLOCK
#endif
#ifdef WSAEWOULDBLOCK
                || errno == WSAEWOULDBLOCK
#endif
		)
		continue;
#ifdef WSAEMSGSIZE
            if (errno != WSAEMSGSIZE)
                return (FALSE);
            else
            {
                got = num_bytes;
#ifdef NP_DEBUG
                printf ("SERVER: WSAEMSGSIZE, actual bytes %d while receiving data @%d\n", got, S9xGetMilliTime () - START);
#endif
            }
#else
            return (FALSE);
#endif
        }
        else
        if (got == 0)
            return (FALSE);

        len -= got;
        ptr += got;
    } while (len > 0);

    return (TRUE);
}

static bool8 S9xNPSSendData (int fd, const uint8 *data, int length)
{
    int Percent = 0;
    int len = length;
    int chunk = length / 50;

    if (chunk < 1024)
        chunk = 1024;
    
    do
    {
        int num_bytes = len;

        // Write the data in small chunks, allowing this thread to spot an
        // abort request from another thread.
        if (num_bytes > chunk)
            num_bytes = chunk;

	int sent;
	sent = write (fd, (char *) data, len);

	if (sent < 0)
	{
	    if (errno == EINTR 
#ifdef EAGAIN
		|| errno == EAGAIN
#endif
#ifdef EWOULDBLOCK
		|| errno == EWOULDBLOCK
#endif
		)
            {
#ifdef NP_DEBUG
                printf ("SERVER: EINTR, EAGAIN or EWOULDBLOCK while sending data @%ld\n", S9xGetMilliTime () - START);
#endif
		continue;
            }
	    return (FALSE);
	}
	else
	if (sent == 0)
	    return (FALSE);
	len -= sent;
	data += sent;
        if (length > 1024)
        {
            Percent = (uint8) (((length - len) * 100) / length);
#ifdef __WIN32__
            PostMessage (GUI.hWnd, WM_USER, Percent, Percent);
            Sleep (0);
#endif
        }
    } while (len > 0);

    return (TRUE);
}

void S9xNPSendHeartBeat ()
{
    int len = 3;
    uint8 data [3 + 4 * 5];
    uint8 *ptr = data;
    int n;

    for (n = NP_MAX_CLIENTS - 1; n >= 0; n--)
    {
        if (NPServer.Clients [n].SaidHello)
            break;
    }

    if (n >= 0)
    {
        bool8 Paused = NPServer.Paused != 0;
        
        NPServer.FrameCount++;
        *ptr++ = NP_SERV_MAGIC;
        *ptr++ = 0; // Individual client sequence number will get placed here
        *ptr++ = NP_SERV_JOYPAD | (n << 6) | ((Paused != 0) << 5);
        
        WRITE_LONG (ptr, NPServer.FrameCount);
        len += 4;
        ptr += 4;

        int i;
        
        for (i = 0; i <= n; i++)
        {
            WRITE_LONG (ptr, NPServer.Joypads [i]);
            len += 4;
            ptr += 4;
        }

        S9xNPSendToAllClients (data, len);
    }
}

void S9xNPSendToAllClients (uint8 *data, int len)
{
    int i;

    for (i = 0; i < NP_MAX_CLIENTS; i++)
    {
	if (NPServer.Clients [i].SaidHello)
	{
            data [1] = NPServer.Clients [i].SendSequenceNum++;
	    if (!S9xNPSSendData (NPServer.Clients [i].Socket, data, len))
		S9xNPShutdownClient (i, TRUE);
	}
    }
}

void S9xNPProcessClient (int c)
{
    uint8 header [7];
    uint8 *data;
    uint32 len;
    uint8 *ptr;

    if (!S9xNPSGetData (NPServer.Clients [c].Socket, header, 7))
    {
        S9xNPSetWarning ("SERVER: Failed to get message header from client.\n");
        S9xNPShutdownClient (c, TRUE);
        return;
    }
    if (header [0] != NP_CLNT_MAGIC)
    {
        S9xNPSetWarning ("SERVER: Bad header magic value received from client.\n");
        S9xNPShutdownClient (c, TRUE);
        return;
    }

    if (header [1] != NPServer.Clients [c].ReceiveSequenceNum)
    {
#ifdef NP_DEBUG
        printf ("SERVER: Messages lost from '%s', expected %d, got %d\n",
                NPServer.Clients [c].HostName ? 
                NPServer.Clients [c].HostName : "Unknown", 
                NPServer.Clients [c].ReceiveSequenceNum,
                header [1]);
#endif
        sprintf (NetPlay.WarningMsg, 
                 "SERVER: Messages lost from '%s', expected %d, got %d\n",
                NPServer.Clients [c].HostName ? 
                NPServer.Clients [c].HostName : "Unknown", 
                NPServer.Clients [c].ReceiveSequenceNum,
                header [1]);
        NPServer.Clients [c].ReceiveSequenceNum = header [1] + 1;
        S9xNPSetWarning (NetPlay.WarningMsg);
    }
    else
        NPServer.Clients [c].ReceiveSequenceNum++;

    len = READ_LONG (&header [3]);

    switch (header [2] & 0x3f)
    {
        case NP_CLNT_HELLO:
#ifdef NP_DEBUG
            printf ("SERVER: Got HELLO from client @%ld\n", S9xGetMilliTime () - START);
#endif
            S9xNPSetAction ("Got HELLO from client...", TRUE);
            if (len > 0x10000)
            {
                S9xNPSetWarning ("SERVER: Client HELLO message length error.");
                S9xNPShutdownClient (c, TRUE);
                return;
            }
            data = new uint8 [len - 7];
            if (!S9xNPSGetData (NPServer.Clients [c].Socket, data, len - 7))
            {
                S9xNPSetWarning ("SERVER: Failed to get HELLO message content from client.");
                S9xNPShutdownClient (c, TRUE);
                return;
            }

            if (NPServer.NumClients <= NP_ONE_CLIENT)
            {
		NPServer.FrameTime = READ_LONG (data);
		strncpy (NPServer.ROMName, (char *) &data [4], 29);
		NPServer.ROMName [29] = 0;
            }

            NPServer.Clients [c].ROMName = strdup ((char *) &data [4]);
#ifdef NP_DEBUG
            printf ("SERVER: Client is playing: %s, Frame Time: %d @%ld\n", data + 4, READ_LONG (data), S9xGetMilliTime () - START);