wxWidgets/include/wx/socket.h

/////////////////////////////////////////////////////////////////////////////
// Name:        socket.h
// Purpose:     Socket handling classes
// Authors:     Guilhem Lavaux, Guillermo Rodriguez Garcia
// Modified by:
// Created:     April 1997
// RCS-ID:      $Id$
// Copyright:   (c) Guilhem Lavaux
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_SOCKET_H_
#define _WX_SOCKET_H_

#include "wx/defs.h"

#if wxUSE_SOCKETS

// ---------------------------------------------------------------------------
// wxSocket headers
// ---------------------------------------------------------------------------

#include "wx/event.h"
#include "wx/sckaddr.h"
#include "wx/list.h"

class wxSocketImpl;

// ------------------------------------------------------------------------
// Types and constants
// ------------------------------------------------------------------------

// Types of different socket notifications or events.
//
// NB: the values here should be consecutive and start with 0 as they are
//     used to construct the wxSOCKET_XXX_FLAG bit mask values below
enum wxSocketNotify
{
    wxSOCKET_INPUT,
    wxSOCKET_OUTPUT,
    wxSOCKET_CONNECTION,
    wxSOCKET_LOST,
    wxSOCKET_MAX_EVENT
};

enum
{
    wxSOCKET_INPUT_FLAG = 1 << wxSOCKET_INPUT,
    wxSOCKET_OUTPUT_FLAG = 1 << wxSOCKET_OUTPUT,
    wxSOCKET_CONNECTION_FLAG = 1 << wxSOCKET_CONNECTION,
    wxSOCKET_LOST_FLAG = 1 << wxSOCKET_LOST
};

// this is a combination of the bit masks defined above
typedef int wxSocketEventFlags;

enum wxSocketError
{
    wxSOCKET_NOERROR = 0,
    wxSOCKET_INVOP,
    wxSOCKET_IOERR,
    wxSOCKET_INVADDR,
    wxSOCKET_INVSOCK,
    wxSOCKET_NOHOST,
    wxSOCKET_INVPORT,
    wxSOCKET_WOULDBLOCK,
    wxSOCKET_TIMEDOUT,
    wxSOCKET_MEMERR,
    wxSOCKET_OPTERR
};

// socket options/flags bit masks
enum
{
    wxSOCKET_NONE = 0,
    wxSOCKET_NOWAIT = 1,
    wxSOCKET_WAITALL = 2,
    wxSOCKET_BLOCK = 4,
    wxSOCKET_REUSEADDR = 8,
    wxSOCKET_BROADCAST = 16,
    wxSOCKET_NOBIND = 32
};

typedef int wxSocketFlags;

// socket kind values (badly defined, don't use)
enum wxSocketType
{
    wxSOCKET_UNINIT,
    wxSOCKET_CLIENT,
    wxSOCKET_SERVER,
    wxSOCKET_BASE,
    wxSOCKET_DATAGRAM
};



// --------------------------------------------------------------------------
// wxSocketBase
// --------------------------------------------------------------------------

class WXDLLIMPEXP_NET wxSocketBase : public wxObject
{
  DECLARE_CLASS(wxSocketBase)

public:

  // Public interface
  // ----------------

  // ctors and dtors
  wxSocketBase();
  wxSocketBase(wxSocketFlags flags, wxSocketType type);
  virtual ~wxSocketBase();
  void Init();
  bool Destroy();

  // state
  bool Ok() const { return IsOk(); }
  bool IsOk() const { return m_impl != NULL; }
  bool Error() const { return m_error; }
  bool IsClosed() const { return m_closed; }
  bool IsConnected() const { return m_connected; }
  bool IsData() { return WaitForRead(0, 0); }
  bool IsDisconnected() const { return !IsConnected(); }
  wxUint32 LastCount() const { return m_lcount; }
  wxSocketError LastError() const;
  void SaveState();
  void RestoreState();

  // addresses
  virtual bool GetLocal(wxSockAddress& addr_man) const;
  virtual bool GetPeer(wxSockAddress& addr_man) const;
  virtual bool SetLocal(const wxIPV4address& local);

  // base IO
  virtual bool  Close();
  wxSocketBase& Discard();
  wxSocketBase& Peek(void* buffer, wxUint32 nbytes);
  wxSocketBase& Read(void* buffer, wxUint32 nbytes);
  wxSocketBase& ReadMsg(void *buffer, wxUint32 nbytes);
  wxSocketBase& Unread(const void *buffer, wxUint32 nbytes);
  wxSocketBase& Write(const void *buffer, wxUint32 nbytes);
  wxSocketBase& WriteMsg(const void *buffer, wxUint32 nbytes);

  // all Wait() functions wait until their condition is satisfied or the
  // timeout expires; if seconds == -1 (default) then m_timeout value is used
  //
  // it is also possible to call InterruptWait() to cancel any current Wait()

  // wait for anything at all to happen with this socket
  bool Wait(long seconds = -1, long milliseconds = 0);

  // wait until we can read from or write to the socket without blocking
  // (notice that this does not mean that the operation will succeed but only
  // that it will return immediately)
  bool WaitForRead(long seconds = -1, long milliseconds = 0);
  bool WaitForWrite(long seconds = -1, long milliseconds = 0);

  // wait until the connection is terminated
  bool WaitForLost(long seconds = -1, long milliseconds = 0);

  void InterruptWait() { m_interrupt = true; }


  wxSocketFlags GetFlags() const { return m_flags; }
  void SetFlags(wxSocketFlags flags);
  void SetTimeout(long seconds);
  long GetTimeout() const { return m_timeout; }

  bool GetOption(int level, int optname, void *optval, int *optlen);
  bool SetOption(int level, int optname, const void *optval, int optlen);
  wxUint32 GetLastIOSize() const { return m_lcount; }

  // event handling
  void *GetClientData() const { return m_clientData; }
  void SetClientData(void *data) { m_clientData = data; }
  void SetEventHandler(wxEvtHandler& handler, int id = wxID_ANY);
  void SetNotify(wxSocketEventFlags flags);
  void Notify(bool notify);

  // initialize/shutdown the sockets (usually called automatically)
  static bool IsInitialized();
  static bool Initialize();
  static void Shutdown();


  // Implementation from now on
  // --------------------------

  // do not use, should be private (called from wxSocketImpl only)
  void OnRequest(wxSocketNotify notify);

  // do not use, not documented nor supported
  bool IsNoWait() const { return ((m_flags & wxSOCKET_NOWAIT) != 0); }
  wxSocketType GetType() const { return m_type; }

private:
  friend class wxSocketClient;
  friend class wxSocketServer;
  friend class wxDatagramSocket;

  // low level IO
  wxUint32 DoRead(void* buffer, wxUint32 nbytes);
  wxUint32 DoWrite(const void *buffer, wxUint32 nbytes);

  // wait until the given flags are set for this socket or the given timeout
  // (or m_timeout) expires
  //
  // notice that wxSOCKET_LOST_FLAG is always taken into account but the return
  // value depends on whether it is included in flags or not: if it is, and the
  // connection is indeed lost, true is returned, but if it isn't then the
  // function returns false in this case
  //
  // false is always returned if we returned because of the timeout expiration
  bool DoWait(long seconds, long milliseconds, wxSocketEventFlags flags);

  // pushback buffer
  void     Pushback(const void *buffer, wxUint32 size);
  wxUint32 GetPushback(void *buffer, wxUint32 size, bool peek);

private:
  // socket
  wxSocketImpl *m_impl;             // port-specific implementation
  wxSocketType  m_type;             // wxSocket type

  // state
  wxSocketFlags m_flags;            // wxSocket flags
  bool          m_connected;        // connected?
  bool          m_establishing;     // establishing connection?
  bool          m_reading;          // busy reading?
  bool          m_writing;          // busy writing?
  bool          m_error;            // did last IO call fail?
  bool          m_closed;           // was the other end closed?
                                    // (notice that m_error is also set then)
  wxUint32      m_lcount;           // last IO transaction size
  unsigned long m_timeout;          // IO timeout value in seconds
  wxList        m_states;           // stack of states
  bool          m_interrupt;        // interrupt ongoing wait operations?
  bool          m_beingDeleted;     // marked for delayed deletion?
  wxIPV4address m_localAddress;     // bind to local address?

  // pushback buffer
  void         *m_unread;           // pushback buffer
  wxUint32      m_unrd_size;        // pushback buffer size
  wxUint32      m_unrd_cur;         // pushback pointer (index into buffer)

  // events
  int           m_id;               // socket id
  wxEvtHandler *m_handler;          // event handler
  void         *m_clientData;       // client data for events
  bool          m_notify;           // notify events to users?
  wxSocketEventFlags  m_eventmask;  // which events to notify?

  // the initialization count, GSocket is initialized if > 0
  static size_t m_countInit;

  DECLARE_NO_COPY_CLASS(wxSocketBase)
};


// --------------------------------------------------------------------------
// wxSocketServer
// --------------------------------------------------------------------------

class WXDLLIMPEXP_NET wxSocketServer : public wxSocketBase
{
  DECLARE_CLASS(wxSocketServer)

public:
  wxSocketServer(const wxSockAddress& addr, wxSocketFlags flags = wxSOCKET_NONE);

  wxSocketBase* Accept(bool wait = true);
  bool AcceptWith(wxSocketBase& socket, bool wait = true);

  bool WaitForAccept(long seconds = -1, long milliseconds = 0);

  DECLARE_NO_COPY_CLASS(wxSocketServer)
};


// --------------------------------------------------------------------------
// wxSocketClient
// --------------------------------------------------------------------------

class WXDLLIMPEXP_NET wxSocketClient : public wxSocketBase
{
  DECLARE_CLASS(wxSocketClient)

public:
  wxSocketClient(wxSocketFlags flags = wxSOCKET_NONE);
  virtual ~wxSocketClient();

  virtual bool Connect(const wxSockAddress& addr, bool wait = true);
  bool Connect(const wxSockAddress& addr, const wxSockAddress& local,
               bool wait = true);

  bool WaitOnConnect(long seconds = -1, long milliseconds = 0);

  // Sets initial socket buffer sizes using the SO_SNDBUF and SO_RCVBUF options
  // before calling connect (either one can be -1 to leave it unchanged)
  void SetInitialSocketBuffers(int recv, int send)
  {
      m_initialRecvBufferSize = recv;
      m_initialSendBufferSize = send;
  }

private:
  virtual bool DoConnect(const wxSockAddress& addr,
                         const wxSockAddress* local,
                         bool wait = true);

  // buffer sizes, -1 if unset and defaults should be used
  int m_initialRecvBufferSize;
  int m_initialSendBufferSize;

  DECLARE_NO_COPY_CLASS(wxSocketClient)
};


// --------------------------------------------------------------------------
// wxDatagramSocket
// --------------------------------------------------------------------------

// WARNING: still in alpha stage

class WXDLLIMPEXP_NET wxDatagramSocket : public wxSocketBase
{
  DECLARE_CLASS(wxDatagramSocket)

public:
  wxDatagramSocket(const wxSockAddress& addr, wxSocketFlags flags = wxSOCKET_NONE);

  wxDatagramSocket& RecvFrom( wxSockAddress& addr,
                              void* buf,
                              wxUint32 nBytes );
  wxDatagramSocket& SendTo( const wxSockAddress& addr,
                            const void* buf,
                            wxUint32 nBytes );

/* TODO:
  bool Connect(wxSockAddress& addr);
*/
  DECLARE_NO_COPY_CLASS(wxDatagramSocket)
};


// --------------------------------------------------------------------------
// wxSocketEvent
// --------------------------------------------------------------------------

class WXDLLIMPEXP_NET wxSocketEvent : public wxEvent
{
public:
  wxSocketEvent(int id = 0)
      : wxEvent(id, wxEVT_SOCKET)
      {
      }

  wxSocketNotify  GetSocketEvent() const { return m_event; }
  wxSocketBase   *GetSocket() const      { return (wxSocketBase *) GetEventObject(); }
  void           *GetClientData() const  { return m_clientData; }

  virtual wxEvent *Clone() const { return new wxSocketEvent(*this); }

public:
  wxSocketNotify  m_event;
  void           *m_clientData;

  DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxSocketEvent)
};


typedef void (wxEvtHandler::*wxSocketEventFunction)(wxSocketEvent&);

#define wxSocketEventHandler(func) \
    (wxObjectEventFunction)(wxEventFunction)wxStaticCastEvent(wxSocketEventFunction, &func)

#define EVT_SOCKET(id, func) \
    wx__DECLARE_EVT1(wxEVT_SOCKET, id, wxSocketEventHandler(func))

#endif // wxUSE_SOCKETS

#endif // _WX_SOCKET_H_