FFmpeg
os_support.h
Go to the documentation of this file.
1 /*
2  * various OS-feature replacement utilities
3  * copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVFORMAT_OS_SUPPORT_H
23 #define AVFORMAT_OS_SUPPORT_H
24 
25 /**
26  * @file
27  * miscellaneous OS support macros and functions.
28  */
29 
30 #include "config.h"
31 
32 #include <sys/stat.h>
33 
34 #ifdef _WIN32
35 #if HAVE_DIRECT_H
36 #include <direct.h>
37 #endif
38 #if HAVE_IO_H
39 #include <io.h>
40 #endif
41 #endif
42 
43 #ifdef _WIN32
44 # include <fcntl.h>
45 # include <stdint.h>
46 # ifdef lseek
47 # undef lseek
48 # endif
49 # define lseek(f,p,w) _lseeki64((f), (p), (w))
50 # ifdef stat
51 # undef stat
52 # endif
53 
54 # define stat win32_stat
55 
56  /*
57  * The POSIX definition for the stat() function uses a struct of the
58  * same name (struct stat), that why it takes this extra effort for
59  * redirecting/replacing the stat() function with our own one which
60  * is capable to handle long path names on Windows.
61  * The struct below roughly follows the POSIX definition. Time values
62  * are 64bit, but in cases when _USE_32BIT_TIME_T is defined, they
63  * will be set to values no larger than INT32_MAX which corresponds
64  * to file times up to the year 2038.
65  */
66  struct win32_stat
67  {
68  _dev_t st_dev; /* ID of device containing file */
69  _ino_t st_ino; /* inode number */
70  unsigned short st_mode; /* protection */
71  short st_nlink; /* number of hard links */
72  short st_uid; /* user ID of owner */
73  short st_gid; /* group ID of owner */
74  _dev_t st_rdev; /* device ID (if special file) */
75  int64_t st_size; /* total size, in bytes */
76  int64_t st_atime; /* time of last access */
77  int64_t st_mtime; /* time of last modification */
78  int64_t st_ctime; /* time of last status change */
79  };
80 
81 # ifdef fstat
82 # undef fstat
83 # endif
84 # define fstat win32_fstat
85 #endif /* defined(_WIN32) */
86 
87 
88 #ifdef __ANDROID__
89 # if HAVE_UNISTD_H
90 # include <unistd.h>
91 # endif
92 # ifdef lseek
93 # undef lseek
94 # endif
95 # define lseek(f,p,w) lseek64((f), (p), (w))
96 #endif
97 
98 static inline int is_dos_path(const char *path)
99 {
100 #if HAVE_DOS_PATHS
101  if (path[0] && path[1] == ':')
102  return 1;
103 #endif
104  return 0;
105 }
106 
107 #if defined(_WIN32)
108 #ifndef S_IRUSR
109 #define S_IRUSR S_IREAD
110 #endif
111 #ifndef S_IWUSR
112 #define S_IWUSR S_IWRITE
113 #endif
114 #endif
115 
116 #if CONFIG_NETWORK
117 #if defined(_WIN32)
118 #define SHUT_RD SD_RECEIVE
119 #define SHUT_WR SD_SEND
120 #define SHUT_RDWR SD_BOTH
121 #else
122 #include <sys/socket.h>
123 #if !defined(SHUT_RD) /* OS/2, DJGPP */
124 #define SHUT_RD 0
125 #define SHUT_WR 1
126 #define SHUT_RDWR 2
127 #endif
128 #endif
129 
130 #if !HAVE_SOCKLEN_T
131 typedef int socklen_t;
132 #endif
133 
134 /* most of the time closing a socket is just closing an fd */
135 #if !HAVE_CLOSESOCKET
136 #define closesocket close
137 #endif
138 
139 #if !HAVE_POLL_H
140 typedef unsigned long nfds_t;
141 
142 #if HAVE_WINSOCK2_H
143 #include <winsock2.h>
144 #endif
145 #if !HAVE_STRUCT_POLLFD
146 struct pollfd {
147  int fd;
148  short events; /* events to look for */
149  short revents; /* events that occurred */
150 };
151 
152 /* events & revents */
153 #define POLLIN 0x0001 /* any readable data available */
154 #define POLLOUT 0x0002 /* file descriptor is writeable */
155 #define POLLRDNORM POLLIN
156 #define POLLWRNORM POLLOUT
157 #define POLLRDBAND 0x0008 /* priority readable data */
158 #define POLLWRBAND 0x0010 /* priority data can be written */
159 #define POLLPRI 0x0020 /* high priority readable data */
160 
161 /* revents only */
162 #define POLLERR 0x0004 /* errors pending */
163 #define POLLHUP 0x0080 /* disconnected */
164 #define POLLNVAL 0x1000 /* invalid file descriptor */
165 #endif
166 
167 
168 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
169 #define poll ff_poll
170 #endif /* HAVE_POLL_H */
171 #endif /* CONFIG_NETWORK */
172 
173 #ifdef _WIN32
174 #include <stdio.h>
175 #include <windows.h>
176 #include "libavutil/mem.h"
177 #include "libavutil/wchar_filename.h"
178 
179 #define DEF_FS_FUNCTION(name, wfunc, afunc) \
180 static inline int win32_##name(const char *filename_utf8) \
181 { \
182  wchar_t *filename_w; \
183  int ret; \
184  \
185  if (get_extended_win32_path(filename_utf8, &filename_w)) \
186  return -1; \
187  if (!filename_w) \
188  goto fallback; \
189  \
190  ret = wfunc(filename_w); \
191  av_free(filename_w); \
192  return ret; \
193  \
194 fallback: \
195  /* filename may be be in CP_ACP */ \
196  return afunc(filename_utf8); \
197 }
198 
199 DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
200 DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
201 DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
202 
203 static inline int win32_access(const char *filename_utf8, int mode)
204 {
205  wchar_t *filename_w;
206  int ret;
207  if (get_extended_win32_path(filename_utf8, &filename_w))
208  return -1;
209  if (!filename_w)
210  goto fallback;
211  ret = _waccess(filename_w, mode);
212  av_free(filename_w);
213  return ret;
214 fallback:
215  return _access(filename_utf8, mode);
216 }
217 
218 static inline void copy_stat(struct _stat64 *crtstat, struct win32_stat *buf)
219 {
220  buf->st_dev = crtstat->st_dev;
221  buf->st_ino = crtstat->st_ino;
222  buf->st_mode = crtstat->st_mode;
223  buf->st_nlink = crtstat->st_nlink;
224  buf->st_uid = crtstat->st_uid;
225  buf->st_gid = crtstat->st_gid;
226  buf->st_rdev = crtstat->st_rdev;
227  buf->st_size = crtstat->st_size;
228  buf->st_atime = crtstat->st_atime;
229  buf->st_mtime = crtstat->st_mtime;
230  buf->st_ctime = crtstat->st_ctime;
231 }
232 
233 static inline int win32_stat(const char *filename_utf8, struct win32_stat *buf)
234 {
235  struct _stat64 crtstat = { 0 };
236  wchar_t *filename_w;
237  int ret;
238 
239  if (get_extended_win32_path(filename_utf8, &filename_w))
240  return -1;
241 
242  if (filename_w) {
243  ret = _wstat64(filename_w, &crtstat);
244  av_free(filename_w);
245  } else
246  ret = _stat64(filename_utf8, &crtstat);
247 
248  copy_stat(&crtstat, buf);
249 
250  return ret;
251 }
252 
253 static inline int win32_fstat(int fd, struct win32_stat *buf)
254 {
255  struct _stat64 crtstat = { 0 };
256  int ret;
257 
258  ret = _fstat64(fd, &crtstat);
259 
260  copy_stat(&crtstat, buf);
261 
262  return ret;
263 }
264 
265 static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
266 {
267  wchar_t *src_w, *dest_w;
268  int ret;
269 
270  if (get_extended_win32_path(src_utf8, &src_w))
271  return -1;
272  if (get_extended_win32_path(dest_utf8, &dest_w)) {
273  av_free(src_w);
274  return -1;
275  }
276  if (!src_w || !dest_w) {
277  av_free(src_w);
278  av_free(dest_w);
279  goto fallback;
280  }
281 
282  ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);
283  av_free(src_w);
284  av_free(dest_w);
285  // Lacking proper mapping from GetLastError() error codes to errno codes
286  if (ret)
287  errno = EPERM;
288  return ret;
289 
290 fallback:
291  /* filename may be be in CP_ACP */
292 #if !HAVE_UWP
293  ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
294  if (ret)
295  errno = EPERM;
296 #else
297  /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
298  * it is available but not allowed by the app certification kit. However,
299  * it's unlikely that anybody would input filenames in CP_ACP there, so this
300  * fallback is kept mostly for completeness. Alternatively we could
301  * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
302  * explicit conversions with CP_ACP is allegedly forbidden in windows
303  * store apps (or windows phone), and the notion of a native code page
304  * doesn't make much sense there. */
305  ret = rename(src_utf8, dest_utf8);
306 #endif
307  return ret;
308 }
309 
310 #define mkdir(a, b) win32_mkdir(a)
311 #define rename win32_rename
312 #define rmdir win32_rmdir
313 #define unlink win32_unlink
314 #define access win32_access
315 
316 #endif
317 
318 #endif /* AVFORMAT_OS_SUPPORT_H */
wchar_filename.h
int64_t
long long int64_t
Definition: coverity.c:34
mode
Definition: swscale.c:56
is_dos_path
static int is_dos_path(const char *path)
Definition: os_support.h:98
ret
ret
Definition: filter_design.txt:187
mem.h
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
Generated on Wed Jul 9 2025 19:23:32 for FFmpeg by   doxygen 1.8.17