/*

  * various OS-feature replacement utilities

  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard

  * copyright (c) 2002 Francois Revol

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg 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.

  *

  * FFmpeg 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 FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 
 /* needed by inet_aton() */
 #define _SVID_SOURCE
 

 #include "config.h"

 #include "avformat.h"

 #include "os_support.h"

 #if defined(_WIN32) && !defined(__MINGW32CE__)

 #undef open
 #include <fcntl.h>
 #include <io.h>

 #include <windows.h>

 #include <share.h>

 
 int ff_win32_open(const char *filename_utf8, int oflag, int pmode)
 {
     int fd;
     int num_chars;
     wchar_t *filename_w;
 
     /* convert UTF-8 to wide chars */
     num_chars = MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, NULL, 0);
     if (num_chars <= 0)
         return -1;
     filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
     MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, filename_w, num_chars);
 

     fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);

     av_freep(&filename_w);
 
     /* filename maybe be in CP_ACP */
     if (fd == -1 && !(oflag & O_CREAT))

         return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);

 
     return fd;
 }
 #endif
 

 #if CONFIG_NETWORK

 #include <fcntl.h>

 #if !HAVE_POLL_H

 #if HAVE_SYS_TIME_H

 #include <sys/time.h>

 #endif

 #if HAVE_WINSOCK2_H

 #include <winsock2.h>

 #elif HAVE_SYS_SELECT_H

 #include <sys/select.h>
 #endif

 #endif

 #include "network.h"
 

 #if !HAVE_INET_ATON

 #include <stdlib.h>
 

 int ff_inet_aton(const char *str, struct in_addr *add)

 {
     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
 

     if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
         return 0;

     if (!add1 || (add1 | add2 | add3 | add4) > 255)
         return 0;

     add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);

 
     return 1;
 }

 #else

 int ff_inet_aton(const char *str, struct in_addr *add)

 {
     return inet_aton(str, add);
 }

 #endif /* !HAVE_INET_ATON */

 #if !HAVE_GETADDRINFO
 int ff_getaddrinfo(const char *node, const char *service,

                    const struct addrinfo *hints, struct addrinfo **res)

 {
     struct hostent *h = NULL;
     struct addrinfo *ai;
     struct sockaddr_in *sin;
 

 #if HAVE_WINSOCK2_H
     int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
                                   const struct addrinfo *hints,
                                   struct addrinfo **res);
     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
     win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
     if (win_getaddrinfo)
         return win_getaddrinfo(node, service, hints, res);
 #endif
 

     *res = NULL;

     sin  = av_mallocz(sizeof(struct sockaddr_in));

     if (!sin)
         return EAI_FAIL;
     sin->sin_family = AF_INET;
 
     if (node) {

         if (!ff_inet_aton(node, &sin->sin_addr)) {

             if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
                 av_free(sin);
                 return EAI_FAIL;
             }
             h = gethostbyname(node);
             if (!h) {
                 av_free(sin);
                 return EAI_FAIL;
             }
             memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
         }
     } else {

         if (hints && (hints->ai_flags & AI_PASSIVE))

             sin->sin_addr.s_addr = INADDR_ANY;

         else

             sin->sin_addr.s_addr = INADDR_LOOPBACK;
     }
 
     /* Note: getaddrinfo allows service to be a string, which
      * should be looked up using getservbyname. */
     if (service)
         sin->sin_port = htons(atoi(service));
 
     ai = av_mallocz(sizeof(struct addrinfo));
     if (!ai) {
         av_free(sin);
         return EAI_FAIL;
     }
 

     *res            = ai;
     ai->ai_family   = AF_INET;

     ai->ai_socktype = hints ? hints->ai_socktype : 0;
     switch (ai->ai_socktype) {

     case SOCK_STREAM:
         ai->ai_protocol = IPPROTO_TCP;
         break;
     case SOCK_DGRAM:
         ai->ai_protocol = IPPROTO_UDP;
         break;
     default:
         ai->ai_protocol = 0;
         break;

     }
 

     ai->ai_addr    = (struct sockaddr *)sin;

     ai->ai_addrlen = sizeof(struct sockaddr_in);
     if (hints && (hints->ai_flags & AI_CANONNAME))
         ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
 
     ai->ai_next = NULL;
     return 0;
 }
 
 void ff_freeaddrinfo(struct addrinfo *res)
 {

 #if HAVE_WINSOCK2_H
     void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
     win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
                        GetProcAddress(ws2mod, "freeaddrinfo");
     if (win_freeaddrinfo) {
         win_freeaddrinfo(res);
         return;
     }
 #endif
 

     av_free(res->ai_canonname);
     av_free(res->ai_addr);
     av_free(res);
 }

 
 int ff_getnameinfo(const struct sockaddr *sa, int salen,
                    char *host, int hostlen,
                    char *serv, int servlen, int flags)
 {
     const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 

 #if HAVE_WINSOCK2_H
     int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
                                   char *host, DWORD hostlen,
                                   char *serv, DWORD servlen, int flags);
     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
     win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
     if (win_getnameinfo)
         return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
 #endif
 

     if (sa->sa_family != AF_INET)
         return EAI_FAMILY;
     if (!host && !serv)
         return EAI_NONAME;
 
     if (host && hostlen > 0) {
         struct hostent *ent = NULL;
         uint32_t a;
         if (!(flags & NI_NUMERICHOST))
             ent = gethostbyaddr((const char *)&sin->sin_addr,
                                 sizeof(sin->sin_addr), AF_INET);
 
         if (ent) {
             snprintf(host, hostlen, "%s", ent->h_name);
         } else if (flags & NI_NAMERQD) {
             return EAI_NONAME;
         } else {
             a = ntohl(sin->sin_addr.s_addr);
             snprintf(host, hostlen, "%d.%d.%d.%d",
                      ((a >> 24) & 0xff), ((a >> 16) & 0xff),

                      ((a >>  8) & 0xff),  (a        & 0xff));

         }
     }
 
     if (serv && servlen > 0) {
         struct servent *ent = NULL;
         if (!(flags & NI_NUMERICSERV))
             ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
 

         if (ent)

             snprintf(serv, servlen, "%s", ent->s_name);

         else

             snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
     }
 
     return 0;
 }

 #endif /* !HAVE_GETADDRINFO */

 #if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H

 const char *ff_gai_strerror(int ecode)
 {

     switch (ecode) {
     case EAI_AGAIN:
         return "Temporary failure in name resolution";
     case EAI_BADFLAGS:
         return "Invalid flags for ai_flags";
     case EAI_FAIL:
         return "A non-recoverable error occurred";
     case EAI_FAMILY:
         return "The address family was not recognized or the address "
                "length was invalid for the specified family";
     case EAI_MEMORY:
         return "Memory allocation failure";

 #if EAI_NODATA != EAI_NONAME

     case EAI_NODATA:
         return "No address associated with hostname";

 #endif

     case EAI_NONAME:
         return "The name does not resolve for the supplied parameters";
     case EAI_SERVICE:
         return "servname not supported for ai_socktype";
     case EAI_SOCKTYPE:
         return "ai_socktype not supported";

     }
 
     return "Unknown error";
 }

 #endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */

 int ff_socket_nonblock(int socket, int enable)
 {

 #if HAVE_WINSOCK2_H

     u_long param = enable;
     return ioctlsocket(socket, FIONBIO, &param);

 #else

     if (enable)
         return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
     else
         return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);

 #endif

 }

 #if !HAVE_POLL_H

 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout)

 {
     fd_set read_set;
     fd_set write_set;
     fd_set exception_set;
     nfds_t i;
     int n;
     int rc;
 

 #if HAVE_WINSOCK2_H

     if (numfds >= FD_SETSIZE) {
         errno = EINVAL;
         return -1;
     }

 #endif

     FD_ZERO(&read_set);
     FD_ZERO(&write_set);
     FD_ZERO(&exception_set);
 

     n = 0;

     for (i = 0; i < numfds; i++) {

         if (fds[i].fd < 0)
             continue;

 #if !HAVE_WINSOCK2_H

         if (fds[i].fd >= FD_SETSIZE) {
             errno = EINVAL;
             return -1;
         }
 #endif

         if (fds[i].events & POLLIN)
             FD_SET(fds[i].fd, &read_set);
         if (fds[i].events & POLLOUT)
             FD_SET(fds[i].fd, &write_set);
         if (fds[i].events & POLLERR)
             FD_SET(fds[i].fd, &exception_set);

         if (fds[i].fd >= n)
             n = fds[i].fd + 1;

     }

     if (n == 0)

         /* Hey!? Nothing to poll, in fact!!! */
         return 0;
 

     if (timeout < 0) {

         rc = select(n, &read_set, &write_set, &exception_set, NULL);

     } else {
         struct timeval tv;
         tv.tv_sec  = timeout / 1000;

         tv.tv_usec = 1000 * (timeout % 1000);

         rc         = select(n, &read_set, &write_set, &exception_set, &tv);
     }

 
     if (rc < 0)
         return rc;
 

     for (i = 0; i < numfds; i++) {

         fds[i].revents = 0;
 

         if (FD_ISSET(fds[i].fd, &read_set))
             fds[i].revents |= POLLIN;
         if (FD_ISSET(fds[i].fd, &write_set))
             fds[i].revents |= POLLOUT;
         if (FD_ISSET(fds[i].fd, &exception_set))
             fds[i].revents |= POLLERR;
     }

 
     return rc;
 }

 #endif /* HAVE_POLL_H */

 #endif /* CONFIG_NETWORK */