/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * socket API
 *
 * Copyright 2009 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
 * www - http://harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

/*

  Function naming:
    The intention of this library is to be as close as possible to the original
    socket implementation. This supposed to be valid for function names also,
    but some of the names are very platform dependent, ex., WSA*() functions.
    select() function name is reserved for standard Harbour's function, so,
    socket_*() prefix was used:
      socket_init()    - WSAStartup()
      socket_exit()    - WSACleanup()
      socket_error()   - WSALastError()
      socket_select()  - select()
    Finally I renamed all functions to have socket_*() prefix to be more "prefix
    compatible" and not to occupy a general function names like send(), bind(),
    accept(), listen(), etc.:
      socket_create()       - socket()
      socket_close()        - closesocket()
      socket_shutdown()     - shutdown()
      socket_bind()         - bind()
      socket_listen()       - listen()
      socket_accept()       - accept()
      socket_send()         - send()
      socket_recv()         - recv()
      socket_recv()         - recv()
      socket_getsockname()  - getsockname()
      socket_getpeername()  - getpeername()


  Types mapping:
    SOCKET
      UINT_PTR in Windows, let's map it to pointer type, and INVALID_SOCKET value to NIL

    struct sockaddr
      It is not only IP addresses, also can be IPX, etc. All network-host byte order
      conversion should be hidden from Harbour API. So, let's map to:
        { adress_familly, ... }
          AF_INET: { AF_INET, cAddr, nPort }
          other:   { AF_?, cAddressDump }
*/

#include "hbsocket.h"
#include "hbapiitm.h"

static HB_SOCKET hb_parsocket( int iParam )
{
   return HB_ISPOINTER( iParam ) ? ( HB_SOCKET ) ( HB_PTRDIFF )
                                   hb_parptr( iParam ) : HB_NO_SOCKET;
}

static void hb_retsocket( HB_SOCKET hSocket )
{
   if( hSocket != HB_NO_SOCKET )
      hb_retptr( ( void * ) ( HB_PTRDIFF ) hSocket );
}

static HB_SOCKET hb_itemGetSocket( PHB_ITEM pSocket )
{
   if( pSocket && HB_IS_POINTER( pSocket ) )
      return ( HB_SOCKET ) ( HB_PTRDIFF ) hb_itemGetPtr( pSocket );
   else
      return HB_NO_SOCKET;
}

HB_FUNC( SOCKET_INIT )
{
   hb_retni( hb_socketInit() );
}

HB_FUNC( SOCKET_EXIT )
{
   hb_socketCleanup();
}

HB_FUNC( SOCKET_ERROR )
{
   hb_retni( hb_socketGetError() );
}

HB_FUNC( SOCKET_CREATE )
{
   hb_retsocket( hb_socketOpen( hb_parnidef( 1, HB_SOCKET_PF_INET ),
                                hb_parnidef( 2, HB_SOCKET_PT_STREAM ),
                                hb_parnidef( 3, HB_SOCKET_IPPROTO_TCP ) ) );
}

HB_FUNC( SOCKET_CLOSE )
{
   hb_retni( hb_socketClose( hb_parsocket( 1 ) ) );
}

HB_FUNC( SOCKET_BIND )
{
   void * sa;
   unsigned len;

   if( hb_socketAddrFromItem( &sa, &len, hb_param( 2, HB_IT_ANY ) ) )
   {
      hb_retni( hb_socketBind( hb_parsocket( 1 ), sa, len ) );
      hb_xfree( sa );
   }
}

HB_FUNC( SOCKET_LISTEN )
{
   hb_retni( hb_socketListen( hb_parsocket( 1 ), hb_parnidef( 2, 10 ) ) );
}

HB_FUNC( SOCKET_ACCEPT )
{
   if( HB_ISBYREF( 2 ) )
   {
      void * sa;
      unsigned len;
      PHB_ITEM pItem;

      hb_retsocket( hb_socketAccept( hb_parsocket( 1 ), &sa, &len,
                                     HB_ISNUM( 3 ) ? hb_parnint( 3 ) : -1 ) );
      pItem = hb_socketAddrToItem( sa, len );
      if( pItem )
      {
         hb_itemParamStoreForward( 2, pItem );
         hb_itemRelease( pItem );
      }
      else
         hb_stor( 2 );

      if( sa )
         hb_xfree( sa );
   }
   else
      hb_retsocket( hb_socketAccept( hb_parsocket( 1 ), NULL, 0,
                                     HB_ISNUM( 3 ) ? hb_parnint( 3 ) : -1 ) );
}

HB_FUNC( SOCKET_SHUTDOWN )
{
   hb_retni( hb_socketShutdown( hb_parsocket( 1 ),
                                hb_parnidef( 2, HB_SOCKET_SHUT_RDWR ) ) );
}

HB_FUNC( SOCKET_RECV )
{
   char *   pBuf;
   long     len;

   len = hb_parni( 3 );
   if( len <= 0 )
      len = 4096;
   pBuf = ( char * ) hb_xgrab( len + 1 );
   len = hb_socketRecv( hb_parsocket( 1 ), pBuf, len, hb_parni( 4 ),
                        HB_ISNUM( 5 ) ? hb_parnint( 5 ) : -1 );
   hb_retni( len );
   hb_storclen( pBuf, len > 0 ? len : 0, 2 );
   hb_xfree( pBuf );
}

HB_FUNC( SOCKET_SEND )
{
   hb_retni( hb_socketSend( hb_parsocket( 1 ), hb_parc( 2 ), hb_parclen( 2 ),
                            hb_parni( 4 ), HB_ISNUM( 5 ) ? hb_parnint( 5 ) : -1 ) );
}

HB_FUNC( SOCKET_GETSOCKNAME )
{
   void * sa;
   unsigned len;
   int iRet;

   iRet = hb_socketGetSockName( hb_parsocket( 1 ), &sa, &len );
   hb_retni( iRet );
   if( HB_ISBYREF( 2 ) )
   {
      PHB_ITEM pItem = hb_socketAddrToItem( sa, len );
      if( pItem )
      {
         hb_itemParamStoreForward( 2, pItem );
         hb_itemRelease( pItem );
      }
      else
         hb_stor( 2 );
   }
   if( sa )
      hb_xfree( sa );
}

HB_FUNC( SOCKET_GETPEERNAME )
{
   void * sa;
   unsigned len;
   int iRet;

   iRet = hb_socketGetPeerName( hb_parsocket( 1 ), &sa, &len );
   hb_retni( iRet );
   if( HB_ISBYREF( 2 ) )
   {
      PHB_ITEM pItem = hb_socketAddrToItem( sa, len );
      if( pItem )
      {
         hb_itemParamStoreForward( 2, pItem );
         hb_itemRelease( pItem );
      }
      else
         hb_stor( 2 );
   }
   if( sa )
      hb_xfree( sa );
}

HB_FUNC( SOCKET_CONNECT )
{
   void * sa;
   unsigned len;

   if( hb_socketAddrFromItem( &sa, &len, hb_param( 2, HB_IT_ANY ) ) )
   {
      hb_retni( hb_socketConnect( hb_parsocket( 1 ), sa, len,
                                  HB_ISNUM( 3 ) ? hb_parnint( 3 ) : -1 ) );
      hb_xfree( sa );
   }
}

HB_FUNC( SOCKET_SELECT )
{
   hb_retni( hb_socketSelect( hb_param( 1, HB_IT_ARRAY ), HB_ISBYREF( 1 ),
                              hb_param( 2, HB_IT_ARRAY ), HB_ISBYREF( 2 ),
                              hb_param( 3, HB_IT_ARRAY ), HB_ISBYREF( 3 ),
                              HB_ISNUM( 4 ) ? hb_parnint( 4 ) : -1,
                              hb_itemGetSocket ) );
}