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netface.hpp

// structure used to comminicate with the engine

#ifndef __NETFACE_HPP_
#define __NETFACE_HPP_

#define PACKET_MAX_SIZE 1024    // this is a game data packet (udp/ipx)
#define READ_PACKET_SIZE 1024   // this is a file service packet (tcp/spx)
#define NET_CRC_FILENAME "#net_crc"
#define NET_STARTFILE    "netstart.spe"
#include "indian.hpp"
#include <string.h>


// list of commands for general networking and file services

enum { NFCMD_OPEN,
       NFCMD_CLOSE,
       NFCMD_READ,
       NFCMD_WRITE,
       NFCMD_SEEK,
       NFCMD_SIZE,
       NFCMD_TELL,
       NFCMD_SET_FS,            // used to set the default (active) filesever
       NFCMD_CRCS_CALCED,       // engine sends this to driver after crcs are saved
       NFCMD_REQUEST_LSF,       // engine sends to driver with remote server name, returns 0 for failure or lsf name
       NFCMD_PROCESS_LSF,       // remote engine sends to driver with lsf name, when get_lsf is set in base_mem
       NFCMD_REQUEST_ENTRY,     // sent from joining client engine to driver, who then connects as client_abuse
       NFCMD_BECOME_SERVER,
       NFCMD_BLOCK,             // used by UNIX version to have engine give it up it's time-slice  
       NFCMD_RELOAD_START,
       NFCMD_RELOAD_END,
       NFCMD_SEND_INPUT, 
       NFCMD_INPUT_MISSING,     // when engine is waiting for input and suspects packets are missing
       NFCMD_KILL_SLACKERS,     // when the user decides the clients are taking too long to respond
       EGCMD_DIE
     };

// client commands
enum { CLCMD_JOIN_FAILED,
       CLCMD_JOIN_SUCCESS,     
       CLCMD_RELOAD_START,           // will you please load netstart.spe
       CLCMD_RELOAD_END,            // netstart.spe has been loaded, please continue
       CLCMD_REQUEST_RESEND,        // input didn't arrive, please resend
       CLCMD_UNJOIN                 // causes server to delete you (addes your delete command to next out packet)
     } ;
       

// return codes for NFCMD_OPEN
enum { NF_OPEN_FAILED,
       NF_OPEN_LOCAL_FILE,      // should return path to local file as well
       NF_OPEN_REMOTE_FILE } ;  // returned to engine for a filename


// types of clients allowed to connect
enum { CLIENT_NFS=50,           // client can read one remote files
       CLIENT_ABUSE,            // waits for entry into a game
       CLIENT_CRC_WAITER,       // client waits for crcs to be saved
       CLIENT_LSF_WAITER        // waits for lsf to be transmitted
       
     } ; 

// base->input_state will be one of the following

enum { INPUT_COLLECTING,       // waiting for driver to receive input from clients/server
       INPUT_PROCESSING,       // waiting for engine to process input from last tick
       INPUT_RELOAD,           // server is waiting on clients to reload, process game packets, but don't store them
       INPUT_NET_DEAD };       // net driver detected an unrecoverable net error, engine should shut down net services



// the net driver should not use any of these except SCMD_DELETE_CLIENT (0) because
// they are subject to change
enum { 
       SCMD_DELETE_CLIENT,
       SCMD_VIEW_RESIZE,
       SCMD_SET_INPUT,
       SCMD_WEAPON_CHANGE,
       SCMD_END_OF_PACKET,
       SCMD_RELOAD,
       SCMD_KEYPRESS,
       SCMD_KEYRELEASE,
       SCMD_EXT_KEYPRESS,
       SCMD_EXT_KEYRELEASE,
       SCMD_CHAT_KEYPRESS,
       SCMD_SYNC
     };


struct join_struct
{
  int client_id;
  char name[100];
  join_struct *next;
} ;

struct net_packet
{
  unsigned char data[PACKET_MAX_SIZE];
  int packet_prefix_size()                 { return 5; }    // 2 byte size, 2 byte check sum, 1 byte packet order
  unsigned short packet_size()             { unsigned short size=(*(unsigned short *)data); return lstl(size); }
  unsigned char tick_received()            { return data[4]; }  
  void set_tick_received(unsigned char x)  { data[4]=x; }
  unsigned char *packet_data()             { return data+packet_prefix_size(); }
  unsigned short get_checksum()            { unsigned short cs=*((unsigned short *)data+1); return lstl(cs); }
  unsigned short calc_checksum()
  {
    *((unsigned short *)data+1)=0;
    int i,size=packet_prefix_size()+packet_size();
    unsigned char c1=0,c2=0,*p=data;
    for (i=0;i<size;i++,p++)
    {
      c1+=*p;
      c2+=c1;
    }
    unsigned short cs=( (((unsigned short)c1)<<8) | c2);
    *((unsigned short *)data+1)=lstl(cs);
    return cs;
  }


  void packet_reset()    { set_packet_size(0); }     // 2 bytes for size, 1 byte for tick
  
  void add_to_packet(void *buf, int size) 
  { 
    if (size && size+packet_size()+packet_prefix_size()<PACKET_MAX_SIZE)
    {
      memcpy(data+packet_size()+packet_prefix_size(),buf,size);
      set_packet_size(packet_size()+size);
    }
  }
  void write_byte(unsigned char x) { add_to_packet(&x,1); }
  void write_short(unsigned short x) { x=lstl(x); add_to_packet(&x,2); }
  void write_long(unsigned long x) { x=lltl(x); add_to_packet(&x,4); }

  void set_packet_size(unsigned short x) { *((unsigned short *)data)=lstl(x); }


} ;

struct base_memory_struct
{
  net_packet packet,                        // current tick data
             last_packet;                   // last tick data (in case a client misses input, we can resend)

  short mem_lock;
  short calc_crcs;
  short get_lsf;
  short wait_reload;
  short need_reload;
  short input_state;            // COLLECTING or PROCESSING
  short current_tick;           // set by engine, used by driver to confirm packet is not left over
  
  join_struct *join_list;
} ;



#endif

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