FFmpeg: libavformat/os_support.c Source File

00001 /*
00002  * various OS-feature replacement utilities
00003  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
00004  * copyright (c) 2002 Francois Revol
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 /* needed by inet_aton() */
00024 #define _SVID_SOURCE
00025 
00026 #include "config.h"
00027 #include "avformat.h"
00028 #include "os_support.h"
00029 
00030 #if defined(_WIN32) && !defined(__MINGW32CE__)
00031 #include <windows.h>
00032 
00033 #undef open
00034 int ff_win32_open(const char *filename_utf8, int oflag, int pmode)
00035 {
00036     int fd;
00037     int num_chars;
00038     wchar_t *filename_w;
00039 
00040     /* convert UTF-8 to wide chars */
00041     num_chars = MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, NULL, 0);
00042     if (num_chars <= 0)
00043         return -1;
00044     filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
00045     MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, filename_w, num_chars);
00046 
00047     fd = _wopen(filename_w, oflag, pmode);
00048     av_freep(&filename_w);
00049 
00050     /* filename maybe be in CP_ACP */
00051     if (fd == -1 && !(oflag & O_CREAT))
00052         return open(filename_utf8, oflag, pmode);
00053 
00054     return fd;
00055 }
00056 #endif
00057 
00058 #if CONFIG_NETWORK
00059 #include <fcntl.h>
00060 #include <unistd.h>
00061 #if !HAVE_POLL_H
00062 #include <sys/time.h>
00063 #if HAVE_WINSOCK2_H
00064 #include <winsock2.h>
00065 #elif HAVE_SYS_SELECT_H
00066 #include <sys/select.h>
00067 #endif
00068 #endif
00069 
00070 #include "network.h"
00071 
00072 #if !HAVE_INET_ATON
00073 #include <stdlib.h>
00074 
00075 int ff_inet_aton (const char * str, struct in_addr * add)
00076 {
00077     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
00078 
00079     if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
00080         return 0;
00081 
00082     if (!add1 || (add1|add2|add3|add4) > 255) return 0;
00083 
00084     add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
00085 
00086     return 1;
00087 }
00088 #else
00089 int ff_inet_aton (const char * str, struct in_addr * add)
00090 {
00091     return inet_aton(str, add);
00092 }
00093 #endif /* !HAVE_INET_ATON */
00094 
00095 #if !HAVE_GETADDRINFO
00096 int ff_getaddrinfo(const char *node, const char *service,
00097                 const struct addrinfo *hints, struct addrinfo **res)
00098 {
00099     struct hostent *h = NULL;
00100     struct addrinfo *ai;
00101     struct sockaddr_in *sin;
00102 
00103 #if HAVE_WINSOCK2_H
00104     int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
00105                                   const struct addrinfo *hints,
00106                                   struct addrinfo **res);
00107     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
00108     win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
00109     if (win_getaddrinfo)
00110         return win_getaddrinfo(node, service, hints, res);
00111 #endif
00112 
00113     *res = NULL;
00114     sin = av_mallocz(sizeof(struct sockaddr_in));
00115     if (!sin)
00116         return EAI_FAIL;
00117     sin->sin_family = AF_INET;
00118 
00119     if (node) {
00120         if (!ff_inet_aton(node, &sin->sin_addr)) {
00121             if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
00122                 av_free(sin);
00123                 return EAI_FAIL;
00124             }
00125             h = gethostbyname(node);
00126             if (!h) {
00127                 av_free(sin);
00128                 return EAI_FAIL;
00129             }
00130             memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
00131         }
00132     } else {
00133         if (hints && (hints->ai_flags & AI_PASSIVE)) {
00134             sin->sin_addr.s_addr = INADDR_ANY;
00135         } else
00136             sin->sin_addr.s_addr = INADDR_LOOPBACK;
00137     }
00138 
00139     /* Note: getaddrinfo allows service to be a string, which
00140      * should be looked up using getservbyname. */
00141     if (service)
00142         sin->sin_port = htons(atoi(service));
00143 
00144     ai = av_mallocz(sizeof(struct addrinfo));
00145     if (!ai) {
00146         av_free(sin);
00147         return EAI_FAIL;
00148     }
00149 
00150     *res = ai;
00151     ai->ai_family = AF_INET;
00152     ai->ai_socktype = hints ? hints->ai_socktype : 0;
00153     switch (ai->ai_socktype) {
00154     case SOCK_STREAM: ai->ai_protocol = IPPROTO_TCP; break;
00155     case SOCK_DGRAM:  ai->ai_protocol = IPPROTO_UDP; break;
00156     default:          ai->ai_protocol = 0;           break;
00157     }
00158 
00159     ai->ai_addr = (struct sockaddr *)sin;
00160     ai->ai_addrlen = sizeof(struct sockaddr_in);
00161     if (hints && (hints->ai_flags & AI_CANONNAME))
00162         ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
00163 
00164     ai->ai_next = NULL;
00165     return 0;
00166 }
00167 
00168 void ff_freeaddrinfo(struct addrinfo *res)
00169 {
00170 #if HAVE_WINSOCK2_H
00171     void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
00172     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
00173     win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
00174                        GetProcAddress(ws2mod, "freeaddrinfo");
00175     if (win_freeaddrinfo) {
00176         win_freeaddrinfo(res);
00177         return;
00178     }
00179 #endif
00180 
00181     av_free(res->ai_canonname);
00182     av_free(res->ai_addr);
00183     av_free(res);
00184 }
00185 
00186 int ff_getnameinfo(const struct sockaddr *sa, int salen,
00187                    char *host, int hostlen,
00188                    char *serv, int servlen, int flags)
00189 {
00190     const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
00191 
00192 #if HAVE_WINSOCK2_H
00193     int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
00194                                   char *host, DWORD hostlen,
00195                                   char *serv, DWORD servlen, int flags);
00196     HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
00197     win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
00198     if (win_getnameinfo)
00199         return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
00200 #endif
00201 
00202     if (sa->sa_family != AF_INET)
00203         return EAI_FAMILY;
00204     if (!host && !serv)
00205         return EAI_NONAME;
00206 
00207     if (host && hostlen > 0) {
00208         struct hostent *ent = NULL;
00209         uint32_t a;
00210         if (!(flags & NI_NUMERICHOST))
00211             ent = gethostbyaddr((const char *)&sin->sin_addr,
00212                                 sizeof(sin->sin_addr), AF_INET);
00213 
00214         if (ent) {
00215             snprintf(host, hostlen, "%s", ent->h_name);
00216         } else if (flags & NI_NAMERQD) {
00217             return EAI_NONAME;
00218         } else {
00219             a = ntohl(sin->sin_addr.s_addr);
00220             snprintf(host, hostlen, "%d.%d.%d.%d",
00221                      ((a >> 24) & 0xff), ((a >> 16) & 0xff),
00222                      ((a >>  8) & 0xff), ( a        & 0xff));
00223         }
00224     }
00225 
00226     if (serv && servlen > 0) {
00227         struct servent *ent = NULL;
00228         if (!(flags & NI_NUMERICSERV))
00229             ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
00230 
00231         if (ent) {
00232             snprintf(serv, servlen, "%s", ent->s_name);
00233         } else
00234             snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
00235     }
00236 
00237     return 0;
00238 }
00239 
00240 const char *ff_gai_strerror(int ecode)
00241 {
00242     switch(ecode) {
00243     case EAI_FAIL   : return "A non-recoverable error occurred";
00244     case EAI_FAMILY : return "The address family was not recognized or the address length was invalid for the specified family";
00245     case EAI_NONAME : return "The name does not resolve for the supplied parameters";
00246     }
00247 
00248     return "Unknown error";
00249 }
00250 #endif
00251 
00252 int ff_socket_nonblock(int socket, int enable)
00253 {
00254 #if HAVE_WINSOCK2_H
00255    return ioctlsocket(socket, FIONBIO, &enable);
00256 #else
00257    if (enable)
00258       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
00259    else
00260       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
00261 #endif
00262 }
00263 
00264 #if !HAVE_POLL_H
00265 int poll(struct pollfd *fds, nfds_t numfds, int timeout)
00266 {
00267     fd_set read_set;
00268     fd_set write_set;
00269     fd_set exception_set;
00270     nfds_t i;
00271     int n;
00272     int rc;
00273 
00274 #if HAVE_WINSOCK2_H
00275     if (numfds >= FD_SETSIZE) {
00276         errno = EINVAL;
00277         return -1;
00278     }
00279 #endif
00280 
00281     FD_ZERO(&read_set);
00282     FD_ZERO(&write_set);
00283     FD_ZERO(&exception_set);
00284 
00285     n = -1;
00286     for(i = 0; i < numfds; i++) {
00287         if (fds[i].fd < 0)
00288             continue;
00289 #if !HAVE_WINSOCK2_H
00290         if (fds[i].fd >= FD_SETSIZE) {
00291             errno = EINVAL;
00292             return -1;
00293         }
00294 #endif
00295 
00296         if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
00297         if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
00298         if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
00299 
00300         if (fds[i].fd > n)
00301             n = fds[i].fd;
00302     };
00303 
00304     if (n == -1)
00305         /* Hey!? Nothing to poll, in fact!!! */
00306         return 0;
00307 
00308     if (timeout < 0)
00309         rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
00310     else {
00311         struct timeval    tv;
00312 
00313         tv.tv_sec = timeout / 1000;
00314         tv.tv_usec = 1000 * (timeout % 1000);
00315         rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
00316     };
00317 
00318     if (rc < 0)
00319         return rc;
00320 
00321     for(i = 0; i < numfds; i++) {
00322         fds[i].revents = 0;
00323 
00324         if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
00325         if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
00326         if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
00327     };
00328 
00329     return rc;
00330 }
00331 #endif /* HAVE_POLL_H */
00332 #endif /* CONFIG_NETWORK */