/*
 * 16-bit socket functions
 *
 * Copyright (C) 1993,1994,1996,1997 John Brezak, Erik Bos, Alex Korobka
 * Copyright (C) 2003 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"
#include "wine/port.h"

#include "winsock2.h"
#include "wine/winbase16.h"
#include "wine/winsock16.h"
#include "wownt32.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(winsock);

static INT num_startup;  /* reference counter */
static void *he_buffer;
static SEGPTR he_buffer_seg;
static void *se_buffer;
static SEGPTR se_buffer_seg;
static void *pe_buffer;
static SEGPTR pe_buffer_seg;
static SEGPTR dbuffer_seg;

extern int WINAPI WS_gethostname(char *name, int namelen);

static WS_fd_set *ws_fdset_16_to_32( const ws_fd_set16 *set16, WS_fd_set *set32 )
{
    UINT i;
    set32->fd_count = set16->fd_count;
    for (i = 0; i < set32->fd_count; i++) set32->fd_array[i] = set16->fd_array[i];
    return set32;
}

static ws_fd_set16 *ws_fdset_32_to_16( const WS_fd_set *set32, ws_fd_set16 *set16 )
{
    UINT i;
    set16->fd_count = set32->fd_count;
    for (i = 0; i < set16->fd_count; i++) set16->fd_array[i] = set32->fd_array[i];
    return set16;
}

static int list_size(char** l, int item_size)
{
    int i,j = 0;
    if(l)
    {
        for(i=0;l[i];i++)
            j += (item_size) ? item_size : strlen(l[i]) + 1;
        j += (i + 1) * sizeof(char*);
    }
    return j;
}

static int list_dup(char** l_src, SEGPTR base, int item_size)
{
    int i, offset;
    char *ref = MapSL(base);
    SEGPTR *l_to = (SEGPTR *)ref;

    for (i = 0; l_src[i]; i++) ;
    offset = (i + 1) * sizeof(char*);
    for (i = 0; l_src[i]; i++)
    {
        int count = item_size ? item_size : strlen(l_src[i]) + 1;
        memcpy( ref + offset, l_src[i], count );
        l_to[i] = base + offset;
        offset += count;
    }
    l_to[i] = 0;
    return offset;
}

static SEGPTR get_buffer_he(int size)
{
    static int he_len;
    if (he_buffer)
    {
        if (he_len >= size ) return he_buffer_seg;
        UnMapLS( he_buffer_seg );
        HeapFree( GetProcessHeap(), 0, he_buffer );
    }
    he_buffer = HeapAlloc( GetProcessHeap(), 0, (he_len = size) );
    he_buffer_seg = MapLS( he_buffer );
    return he_buffer_seg;
}

static SEGPTR get_buffer_se(int size)
{
    static int se_len;
    if (se_buffer)
    {
        if (se_len >= size ) return se_buffer_seg;
        UnMapLS( se_buffer_seg );
        HeapFree( GetProcessHeap(), 0, se_buffer );
    }
    se_buffer = HeapAlloc( GetProcessHeap(), 0, (se_len = size) );
    se_buffer_seg = MapLS( se_buffer );
    return se_buffer_seg;
}

static SEGPTR get_buffer_pe(int size)
{
    static int pe_len;
    if (pe_buffer)
    {
        if (pe_len >= size ) return pe_buffer_seg;
        UnMapLS( pe_buffer_seg );
        HeapFree( GetProcessHeap(), 0, pe_buffer );
    }
    pe_buffer = HeapAlloc( GetProcessHeap(), 0, (pe_len = size) );
    pe_buffer_seg = MapLS( pe_buffer );
    return pe_buffer_seg;
}

/* duplicate hostent entry
 * and handle all Win16/Win32 dependent things (struct size, ...) *correctly*.
 * Ditto for protoent and servent.
 */
static SEGPTR ws_hostent_32_to_16( const struct WS_hostent* he )
{
    char *p;
    SEGPTR base;
    struct ws_hostent16 *p_to;

    int size = (sizeof(*he) +
                strlen(he->h_name) + 1 +
                list_size(he->h_aliases, 0) +
                list_size(he->h_addr_list, he->h_length));

    base = get_buffer_he(size);
    p_to = MapSL(base);

    p_to->h_addrtype = he->h_addrtype;
    p_to->h_length = he->h_length;

    p = (char *)(p_to + 1);
    p_to->h_name = base + (p - (char *)p_to);
    strcpy(p, he->h_name);
    p += strlen(p) + 1;

    p_to->h_aliases = base + (p - (char *)p_to);
    p += list_dup(he->h_aliases, p_to->h_aliases, 0);

    p_to->h_addr_list = base + (p - (char *)p_to);
    list_dup(he->h_addr_list, p_to->h_addr_list, he->h_length);

    return base;
}

static SEGPTR ws_protoent_32_to_16( const struct WS_protoent *pe )
{
    char *p;
    SEGPTR base;
    struct ws_protoent16 *p_to;

    int size = (sizeof(*pe) +
                strlen(pe->p_name) + 1 +
                list_size(pe->p_aliases, 0));

    base = get_buffer_pe(size);
    p_to = MapSL(base);

    p_to->p_proto = pe->p_proto;
    p = (char *)(p_to + 1);

    p_to->p_name = base + (p - (char *)p_to);
    strcpy(p, pe->p_name);
    p += strlen(p) + 1;

    p_to->p_aliases = base + (p - (char *)p_to);
    list_dup(pe->p_aliases, p_to->p_aliases, 0);

    return base;
}

static SEGPTR ws_servent_32_to_16( const struct WS_servent *se )
{
    char *p;
    SEGPTR base;
    struct ws_servent16 *p_to;

    int size = (sizeof(*se) +
                strlen(se->s_proto) + 1 +
                strlen(se->s_name) + 1 +
                list_size(se->s_aliases, 0));

    base = get_buffer_se(size);
    p_to = MapSL(base);

    p_to->s_port = se->s_port;
    p = (char *)(p_to + 1);

    p_to->s_name = base + (p - (char *)p_to);
    strcpy(p, se->s_name);
    p += strlen(p) + 1;

    p_to->s_proto = base + (p - (char *)p_to);
    strcpy(p, se->s_proto);
    p += strlen(p) + 1;

    p_to->s_aliases = base + (p - (char *)p_to);
    list_dup(se->s_aliases, p_to->s_aliases, 0);

    return base;
}


/***********************************************************************
 *              accept		(WINSOCK.1)
 */
SOCKET16 WINAPI accept16(SOCKET16 s, struct WS_sockaddr* addr, INT16* addrlen16 )
{
    INT addrlen32 = addrlen16 ? *addrlen16 : 0;
    SOCKET retSocket = WS_accept( s, addr, &addrlen32 );
    if( addrlen16 ) *addrlen16 = addrlen32;
    return retSocket;
}

/***********************************************************************
 *              bind			(WINSOCK.2)
 */
INT16 WINAPI bind16(SOCKET16 s, struct WS_sockaddr *name, INT16 namelen)
{
    return WS_bind( s, name, namelen );
}

/***********************************************************************
 *              closesocket           (WINSOCK.3)
 */
INT16 WINAPI closesocket16(SOCKET16 s)
{
    return WS_closesocket(s);
}

/***********************************************************************
 *              connect               (WINSOCK.4)
 */
INT16 WINAPI connect16(SOCKET16 s, struct WS_sockaddr *name, INT16 namelen)
{
    return WS_connect( s, name, namelen );
}

/***********************************************************************
 *              getpeername		(WINSOCK.5)
 */
INT16 WINAPI getpeername16(SOCKET16 s, struct WS_sockaddr *name, INT16 *namelen16)
{
    INT namelen32 = *namelen16;
    INT retVal = WS_getpeername( s, name, &namelen32 );
   *namelen16 = namelen32;
    return retVal;
}

/***********************************************************************
 *              getsockname		(WINSOCK.6)
 */
INT16 WINAPI getsockname16(SOCKET16 s, struct WS_sockaddr *name, INT16 *namelen16)
{
    INT retVal;

    if( namelen16 )
    {
        INT namelen32 = *namelen16;
        retVal = WS_getsockname( s, name, &namelen32 );
       *namelen16 = namelen32;
    }
    else retVal = SOCKET_ERROR;
    return retVal;
}

/***********************************************************************
 *              getsockopt		(WINSOCK.7)
 */
INT16 WINAPI getsockopt16(SOCKET16 s, INT16 level, INT16 optname, char *optval, INT16 *optlen)
{
    INT optlen32;
    INT *p = &optlen32;
    INT retVal;
    if( optlen ) optlen32 = *optlen; else p = NULL;
    retVal = WS_getsockopt( s, level, optname, optval, p );
    if( optlen ) *optlen = optlen32;
    return retVal;
}

/***********************************************************************
 *		inet_ntoa		(WINSOCK.11)
 */
SEGPTR WINAPI inet_ntoa16(struct WS_in_addr in)
{
    char* retVal;
    if (!(retVal = WS_inet_ntoa( in ))) return 0;
    if (!dbuffer_seg) dbuffer_seg = MapLS( retVal );
    return dbuffer_seg;
}

/***********************************************************************
 *              ioctlsocket           (WINSOCK.12)
 */
INT16 WINAPI ioctlsocket16(SOCKET16 s, LONG cmd, ULONG *argp)
{
    return WS_ioctlsocket( s, cmd, argp );
}

/***********************************************************************
 *              listen		(WINSOCK.13)
 */
INT16 WINAPI listen16(SOCKET16 s, INT16 backlog)
{
    return WS_listen( s, backlog );
}

/***********************************************************************
 *              recv			(WINSOCK.16)
 */
INT16 WINAPI recv16(SOCKET16 s, char *buf, INT16 len, INT16 flags)
{
    return WS_recv( s, buf, len, flags );
}

/***********************************************************************
 *              recvfrom		(WINSOCK.17)
 */
INT16 WINAPI recvfrom16(SOCKET16 s, char *buf, INT16 len, INT16 flags,
                        struct WS_sockaddr *from, INT16 *fromlen16)
{
    if (fromlen16)
    {
        INT fromlen32 = *fromlen16;
        INT retVal = WS_recvfrom( s, buf, len, flags, from, &fromlen32 );
        *fromlen16 = fromlen32;
        return retVal;
    }
    else return WS_recvfrom( s, buf, len, flags, from, NULL );
}

/***********************************************************************
 *		select			(WINSOCK.18)
 */
INT16 WINAPI select16(INT16 nfds, ws_fd_set16 *ws_readfds,
                      ws_fd_set16 *ws_writefds, ws_fd_set16 *ws_exceptfds,
                      struct WS_timeval* timeout)
{
    WS_fd_set read_set, write_set, except_set;
    WS_fd_set *pread_set = NULL, *pwrite_set = NULL, *pexcept_set = NULL;
    int ret;

    if (ws_readfds) pread_set = ws_fdset_16_to_32( ws_readfds, &read_set );
    if (ws_writefds) pwrite_set = ws_fdset_16_to_32( ws_writefds, &write_set );
    if (ws_exceptfds) pexcept_set = ws_fdset_16_to_32( ws_exceptfds, &except_set );
    /* struct timeval is the same for both 32- and 16-bit code */
    ret = WS_select( nfds, pread_set, pwrite_set, pexcept_set, timeout );
    if (ws_readfds) ws_fdset_32_to_16( &read_set, ws_readfds );
    if (ws_writefds) ws_fdset_32_to_16( &write_set, ws_writefds );
    if (ws_exceptfds) ws_fdset_32_to_16( &except_set, ws_exceptfds );
    return ret;
}

/***********************************************************************
 *              send			(WINSOCK.19)
 */
INT16 WINAPI send16(SOCKET16 s, char *buf, INT16 len, INT16 flags)
{
    return WS_send( s, buf, len, flags );
}

/***********************************************************************
 *              sendto		(WINSOCK.20)
 */
INT16 WINAPI sendto16(SOCKET16 s, char *buf, INT16 len, INT16 flags,
                      struct WS_sockaddr *to, INT16 tolen)
{
    return WS_sendto( s, buf, len, flags, to, tolen );
}

/***********************************************************************
 *              setsockopt		(WINSOCK.21)
 */
INT16 WINAPI setsockopt16(SOCKET16 s, INT16 level, INT16 optname,
                          char *optval, INT16 optlen)
{
    if( !optval ) return SOCKET_ERROR;
    return WS_setsockopt( s, level, optname, optval, optlen );
}

/***********************************************************************
 *              shutdown		(WINSOCK.22)
 */
INT16 WINAPI shutdown16(SOCKET16 s, INT16 how)
{
    return WS_shutdown( s, how );
}

/***********************************************************************
 *              socket		(WINSOCK.23)
 */
SOCKET16 WINAPI socket16(INT16 af, INT16 type, INT16 protocol)
{
    return WS_socket( af, type, protocol );
}

/***********************************************************************
 *		gethostbyaddr		(WINSOCK.51)
 */
SEGPTR WINAPI gethostbyaddr16(const char *addr, INT16 len, INT16 type)
{
    struct WS_hostent *he;

    if (!(he = WS_gethostbyaddr( addr, len, type ))) return 0;
    return ws_hostent_32_to_16( he );
}

/***********************************************************************
 *		gethostbyname		(WINSOCK.52)
 */
SEGPTR WINAPI gethostbyname16(const char *name)
{
    struct WS_hostent *he;

    if (!(he = WS_gethostbyname( name ))) return 0;
    return ws_hostent_32_to_16( he );
}

/***********************************************************************
 *		getprotobyname		(WINSOCK.53)
 */
SEGPTR WINAPI getprotobyname16(const char *name)
{
    struct WS_protoent *pe;

    if (!(pe = WS_getprotobyname( name ))) return 0;
    return ws_protoent_32_to_16( pe );
}

/***********************************************************************
 *		getprotobynumber	(WINSOCK.54)
 */
SEGPTR WINAPI getprotobynumber16(INT16 number)
{
    struct WS_protoent *pe;

    if (!(pe = WS_getprotobynumber( number ))) return 0;
    return ws_protoent_32_to_16( pe );
}

/***********************************************************************
 *		getservbyname		(WINSOCK.55)
 */
SEGPTR WINAPI getservbyname16(const char *name, const char *proto)
{
    struct WS_servent *se;

    if (!(se = WS_getservbyname( name, proto ))) return 0;
    return ws_servent_32_to_16( se );
}

/***********************************************************************
 *		getservbyport		(WINSOCK.56)
 */
SEGPTR WINAPI getservbyport16(INT16 port, const char *proto)
{
    struct WS_servent *se;

    if (!(se = WS_getservbyport( port, proto ))) return 0;
    return ws_servent_32_to_16( se );
}

/***********************************************************************
 *              gethostname           (WINSOCK.57)
 */
INT16 WINAPI gethostname16(char *name, INT16 namelen)
{
    return WS_gethostname(name, namelen);
}

/***********************************************************************
 *      WSAAsyncSelect		(WINSOCK.101)
 */
INT16 WINAPI WSAAsyncSelect16(SOCKET16 s, HWND16 hWnd, UINT16 wMsg, LONG lEvent)
{
    return WSAAsyncSelect( s, HWND_32(hWnd), wMsg, lEvent );
}

/***********************************************************************
 *      WSASetBlockingHook		(WINSOCK.109)
 */
FARPROC16 WINAPI WSASetBlockingHook16(FARPROC16 lpBlockFunc)
{
    /* FIXME: should deal with 16-bit proc */
    return (FARPROC16)WSASetBlockingHook( (FARPROC)lpBlockFunc );
}

/***********************************************************************
 *      WSAUnhookBlockingHook	(WINSOCK.110)
 */
INT16 WINAPI WSAUnhookBlockingHook16(void)
{
    return WSAUnhookBlockingHook();
}

/***********************************************************************
 *      WSASetLastError		(WINSOCK.112)
 */
void WINAPI WSASetLastError16(INT16 iError)
{
    WSASetLastError(iError);
}

/***********************************************************************
 *      WSAStartup			(WINSOCK.115)
 *
 * Create socket control struct, attach it to the global list and
 * update a pointer in the task struct.
 */
INT16 WINAPI WSAStartup16(UINT16 wVersionRequested, LPWSADATA16 lpWSAData)
{
    WSADATA data;
    INT ret = WSAStartup( wVersionRequested, &data );

    if (!ret)
    {
        lpWSAData->wVersion     = 0x0101;
        lpWSAData->wHighVersion = 0x0101;
        strcpy( lpWSAData->szDescription, data.szDescription );
        strcpy( lpWSAData->szSystemStatus, data.szSystemStatus );
        lpWSAData->iMaxSockets = data.iMaxSockets;
        lpWSAData->iMaxUdpDg = data.iMaxUdpDg;
        lpWSAData->lpVendorInfo = 0;
        num_startup++;
   }
    return ret;
}

/***********************************************************************
 *      WSACleanup			(WINSOCK.116)
 */
INT WINAPI WSACleanup16(void)
{
    if (num_startup)
    {
        if (!--num_startup)
        {
            /* delete scratch buffers */
            UnMapLS( he_buffer_seg );
            UnMapLS( se_buffer_seg );
            UnMapLS( pe_buffer_seg );
            UnMapLS( dbuffer_seg );
            he_buffer_seg = 0;
            se_buffer_seg = 0;
            pe_buffer_seg = 0;
            dbuffer_seg = 0;
            HeapFree( GetProcessHeap(), 0, he_buffer );
            HeapFree( GetProcessHeap(), 0, se_buffer );
            HeapFree( GetProcessHeap(), 0, pe_buffer );
            he_buffer = NULL;
            se_buffer = NULL;
            pe_buffer = NULL;
        }
    }
    return WSACleanup();
}


/***********************************************************************
 *	__WSAFDIsSet			(WINSOCK.151)
 */
INT16 WINAPI __WSAFDIsSet16(SOCKET16 s, ws_fd_set16 *set)
{
  int i = set->fd_count;

  TRACE("(%d,%p(%i))\n", s, set, i);

  while (i--)
      if (set->fd_array[i] == s) return 1;
  return 0;
}

/***********************************************************************
 *              WSARecvEx			(WINSOCK.1107)
 *
 * See description for WSARecvEx()
 */
INT16 WINAPI WSARecvEx16(SOCKET16 s, char *buf, INT16 len, INT16 *flags)
{
    FIXME("(WSARecvEx16) partial packet return value not set\n");
    return recv16(s, buf, len, *flags);
}