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#include <qobject.h>

#ifndef u_char
#define u_char uchar

/* TELNET Command Codes: */
/* Hints: These NVT control characters are sent from client to server, So
              the client side will not receive these commands */
#define     TCSB        (u_char)250 /* Start Subnegotiation       */
#define     TCSE        (u_char)240 /* End Of Subnegotiation      */
#define     TCNOP       (u_char)241 /* No Operation               */
#define     TCDM        (u_char)242 /* Data Mark (for Sync)       */
#define     TCBRK       (u_char)243 /* NVT Character BRK          */
#define     TCIP        (u_char)244 /* Interrupt Process          */
#define     TCAO        (u_char)245 /* Abort Output               */
#define     TCAYT       (u_char)246 /* "Are You There?" Function  */
#define     TCEC        (u_char)247 /* Erase Character            */
#define     TCEL        (u_char)248 /* Erase Line                 */
#define     TCGA        (u_char)249 /* "Go Ahead" Function        */
#define     TCWILL            (u_char)251 /* Desire/Confirm Will Do Option*/
#define     TCWONT            (u_char)252 /* Refusal To Do Option       */
#define     TCDO        (u_char)253 /* Request To Do Option       */
#define     TCDONT            (u_char)254 /* Request NOT To Do Option   */
#define     TCIAC       (u_char)255 /* Interpret As Command Escape      */

/* Telnet Option Codes: */
#define     TOTXBINARY  (u_char)  0 /* TRANSMIT-BINARY option     */
#define     TOECHO            (u_char)  1 /* ECHO Option                */
#define     TONOGA            (u_char)  3 /* Suppress Go-Ahead Option   */
#define     TOTERMTYPE  (u_char) 24 /* Terminal-Type Option       */
#define TONAWS          (u_char) 31 /* Window  Size */

/* Network Virtual Printer Special Characters: */
/* In normal situations, these characters will to translated into local
   control characters , then pass to upper layer term. But in our situation,
   we can pass them to term directly */

#define     VPLF        '\n'  /* Line Feed                        */
#define     VPCR        '\r'  /* Carriage Return                  */
#define     VPBEL       '\a'  /* Bell (attention signal)          */
#define     VPBS        '\b'  /* Back Space                       */
#define     VPHT        '\t'  /* Horizontal Tab             */
#define     VPVT        '\v'  /* Vertical Tab                     */
#define     VPFF        '\f'  /* Form Feed                        */

/* Keyboard Command Characters: */

/* Option Subnegotiation Constants: */
#define     TT_IS       0     /* TERMINAL_TYPE option "IS" command      */
#define     TT_SEND           1     /* TERMINAL_TYPE option "SEND" command    */

/* Telnet Socket-Input FSM States: */
#define     TSDATA             0    /* normal data processing           */
#define     TSIAC        1    /* have seen IAC              */
#define     TSWOPT             2    /* have seen IAC-{WILL/WONT}        */
#define     TSDOPT             3    /* have seen IAC-{DO/DONT}          */
#define     TSSUBNEG     4    /* have seen IAC-SB                 */
#define     TSSUBIAC     5    /* have seen IAC-SB-...-IAC         */

#define     NTSTATES     6    /* # of TS* states                  */

// Telnet Option Subnegotiation FSM States:
#define SS_START  0           // initial state
#define     SS_TERMTYPE 1           // TERMINAL_TYPE option subnegotiation
#define     SS_END            2           // state after all legal input
#define     NSSTATES    3           // # of SS_* states     

#define     FSINVALID   0xff        // an invalid state number          
#define     NCHRS       256         // number of valid characters 
#define     TCANY       (NCHRS+1)   // match any character        

#define     TINVALID    0xff        // an invalid transition index            

#define     CTRL(c) ((c)&0x1f)

//  decleration         
class QTermTelnet;           
// actionFunc is a pointer, point to a QTermTelnet's func
typedef int (QTermTelnet::*ptrActionFunc)(int c);     

//fsm struct
struct fsm_trans {
      u_char      ft_state;         // current state        
      short ft_char;          // input character            
      u_char      ft_next;          // next state                 
      ptrActionFunc ft_action;      // action to take       

*     QTermTelnet class definition

class QTermSocket;

class QTermTelnet : public QObject

      QTermTelnet( const QCString termtype, int rows, int columns, bool isSSH, const char * sshuser = NULL, const char * sshpasswd = NULL ) ;
      void setProxy( int nProxyType,//0-no proxy; 1-wingate; 2-sock4; 3-socks5
            bool bAuth, // if authentation needed
            const QString& strProxyHost,Q_UINT16 uProxyPort,
            const QString& strProxyUsr,const QString& strProxyPwd);
      void connectHost(const QString & hostname, Q_UINT16 portnumber);
      int  read(char * data, uint maxlen);
      int  write(const char * data, uint len);
      void close();                       // User close the connection
      int raw_len();
      int read_raw(char *data, uint maxlen);

public slots:
      void windowSizeChanged(int, int);

      void readyRead(int);          // There are datas to be read out
      void TelnetState(int);        // The  state telnet, defined as TSXXXX in qterm.h
private slots:
      void connected();
      void socketReadyRead(); 
      void showError( int );
      void hostFound ();
      void delayCloseFinished();
      void closed();
      //init structure fsm
      void init_telnet();
      void fsmbuild();
      void fsminit(u_char fsm[][NCHRS], struct fsm_trans ttab[], int nstates);

      int tcdm(int);
      int recopt(int);
      int no_op(int);
      int do_echo(int);
      int do_notsup(int);
      int do_noga(int);
      int do_txbinary(int);
      int will_notsup(int);
      int will_txbinary(int);
      int will_termtype(int);
      int will_naws(int);
      int subopt(int);
      int subtermtype(int);
      int subend(int);
      int soputc(int);
      int ttputc(int);
      int tnabort(int);
      //utility functions
      int xputc_up(char);
      int xputs_up(char *);
      void putc_down(u_char); 

      // Boolean Flags
      char  synching, doecho, sndbinary, rcvbinary;
      char    noga;
      char  naws;
      u_char      option_cmd; // has value WILL, WONT, DO, or DONT      

      char  termtype;   // non-zero if received "DO TERMTYPE"     
      char  * term;           // terminal name              

      /* // BBS don't need control signals
        // Special keys - Terminal control characters
      // need work...
      static const  char      t_flushc=CTRL('S');           // Abort Output         i.e:(^S)
      static const  char      t_intrc=CTRL('C');            // Interrupt            i.e:(^C)
      static const  char      t_quitc=CTRL('\\');           // Quit                 i.e:(^\)
      static const  char      sg_erase=CTRL('?');           // Erase a character    i.e:(^?)
      static const  char      sg_kill=CTRL('U');            // Kill a line          i.e:(^U)
      // FSM stuffs     
      static struct fsm_trans ttstab[];
      int   ttstate;
      u_char      ttfsm[NTSTATES][NCHRS];

      static struct fsm_trans substab[];
      int   substate;
      u_char      subfsm[NSSTATES][NCHRS];

      // socket stuffs
      QTermSocket *socket;
      //Pointers to internal buffers
      //             |-->from_socket-->process-->to_ansi-->|
      //  socket<--->                                      <---> ansi decode
      //             |<---to_socket<--process<--from_ansi--|
      QByteArray *from_socket, *to_ansi, *from_ansi, *to_socket;
      uint rsize; // size of to_ansi buffer
      uint wsize; // size of to_socket buffer

      // for test
      int wx, wy;
      int done_naws;
      bool d_isSSH;
      bool bConnected;
      int raw_size;

#endif      // QTERMTELNET_H

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