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 # ifdef lseek
46 # undef lseek
47 # endif
48 # define lseek(f,p,w) _lseeki64((f), (p), (w))
49 # ifdef stat
50 # undef stat
51 # endif
52 
53 # define stat win32_stat
54 
55  /*
56  * The POSIX definition for the stat() function uses a struct of the
57  * same name (struct stat), that why it takes this extra effort for
58  * redirecting/replacing the stat() function with our own one which
59  * is capable to handle long path names on Windows.
60  * The struct below roughly follows the POSIX definition. Time values
61  * are 64bit, but in cases when _USE_32BIT_TIME_T is defined, they
62  * will be set to values no larger than INT32_MAX which corresponds
63  * to file times up to the year 2038.
64  */
65  struct win32_stat
66  {
67  _dev_t st_dev; /* ID of device containing file */
68  _ino_t st_ino; /* inode number */
69  unsigned short st_mode; /* protection */
70  short st_nlink; /* number of hard links */
71  short st_uid; /* user ID of owner */
72  short st_gid; /* group ID of owner */
73  _dev_t st_rdev; /* device ID (if special file) */
74  int64_t st_size; /* total size, in bytes */
75  int64_t st_atime; /* time of last access */
76  int64_t st_mtime; /* time of last modification */
77  int64_t st_ctime; /* time of last status change */
78  };
79 
80 # ifdef fstat
81 # undef fstat
82 # endif
83 # define fstat win32_fstat
84 #endif /* defined(_WIN32) */
85 
86 
87 #ifdef __ANDROID__
88 # if HAVE_UNISTD_H
89 # include <unistd.h>
90 # endif
91 # ifdef lseek
92 # undef lseek
93 # endif
94 # define lseek(f,p,w) lseek64((f), (p), (w))
95 #endif
96 
97 static inline int is_dos_path(const char *path)
98 {
99 #if HAVE_DOS_PATHS
100  if (path[0] && path[1] == ':')
101  return 1;
102 #endif
103  return 0;
104 }
105 
106 #if defined(_WIN32)
107 #ifndef S_IRUSR
108 #define S_IRUSR S_IREAD
109 #endif
110 #ifndef S_IWUSR
111 #define S_IWUSR S_IWRITE
112 #endif
113 #endif
114 
115 #if CONFIG_NETWORK
116 #if defined(_WIN32)
117 #define SHUT_RD SD_RECEIVE
118 #define SHUT_WR SD_SEND
119 #define SHUT_RDWR SD_BOTH
120 #else
121 #include <sys/socket.h>
122 #if !defined(SHUT_RD) /* OS/2, DJGPP */
123 #define SHUT_RD 0
124 #define SHUT_WR 1
125 #define SHUT_RDWR 2
126 #endif
127 #endif
128 
129 #if !HAVE_SOCKLEN_T
130 typedef int socklen_t;
131 #endif
132 
133 /* most of the time closing a socket is just closing an fd */
134 #if !HAVE_CLOSESOCKET
135 #define closesocket close
136 #endif
137 
138 #if !HAVE_POLL_H
139 typedef unsigned long nfds_t;
140 
141 #if HAVE_WINSOCK2_H
142 #include <winsock2.h>
143 #endif
144 #if !HAVE_STRUCT_POLLFD
145 struct pollfd {
146  int fd;
147  short events; /* events to look for */
148  short revents; /* events that occurred */
149 };
150 
151 /* events & revents */
152 #define POLLIN 0x0001 /* any readable data available */
153 #define POLLOUT 0x0002 /* file descriptor is writeable */
154 #define POLLRDNORM POLLIN
155 #define POLLWRNORM POLLOUT
156 #define POLLRDBAND 0x0008 /* priority readable data */
157 #define POLLWRBAND 0x0010 /* priority data can be written */
158 #define POLLPRI 0x0020 /* high priority readable data */
159 
160 /* revents only */
161 #define POLLERR 0x0004 /* errors pending */
162 #define POLLHUP 0x0080 /* disconnected */
163 #define POLLNVAL 0x1000 /* invalid file descriptor */
164 #endif
165 
166 
167 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
168 #define poll ff_poll
169 #endif /* HAVE_POLL_H */
170 #endif /* CONFIG_NETWORK */
171 
172 #ifdef _WIN32
173 #include <stdio.h>
174 #include <windows.h>
175 #include "libavutil/wchar_filename.h"
176 
177 #define DEF_FS_FUNCTION(name, wfunc, afunc) \
178 static inline int win32_##name(const char *filename_utf8) \
179 { \
180  wchar_t *filename_w; \
181  int ret; \
182  \
183  if (get_extended_win32_path(filename_utf8, &filename_w)) \
184  return -1; \
185  if (!filename_w) \
186  goto fallback; \
187  \
188  ret = wfunc(filename_w); \
189  av_free(filename_w); \
190  return ret; \
191  \
192 fallback: \
193  /* filename may be be in CP_ACP */ \
194  return afunc(filename_utf8); \
195 }
196 
197 DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
198 DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
199 DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
200 
201 static inline int win32_access(const char *filename_utf8, int mode)
202 {
203  wchar_t *filename_w;
204  int ret;
205  if (get_extended_win32_path(filename_utf8, &filename_w))
206  return -1;
207  if (!filename_w)
208  goto fallback;
209  ret = _waccess(filename_w, mode);
210  av_free(filename_w);
211  return ret;
212 fallback:
213  return _access(filename_utf8, mode);
214 }
215 
216 static inline void copy_stat(struct _stat64 *crtstat, struct win32_stat *buf)
217 {
218  buf->st_dev = crtstat->st_dev;
219  buf->st_ino = crtstat->st_ino;
220  buf->st_mode = crtstat->st_mode;
221  buf->st_nlink = crtstat->st_nlink;
222  buf->st_uid = crtstat->st_uid;
223  buf->st_gid = crtstat->st_gid;
224  buf->st_rdev = crtstat->st_rdev;
225  buf->st_size = crtstat->st_size;
226  buf->st_atime = crtstat->st_atime;
227  buf->st_mtime = crtstat->st_mtime;
228  buf->st_ctime = crtstat->st_ctime;
229 }
230 
231 static inline int win32_stat(const char *filename_utf8, struct win32_stat *buf)
232 {
233  struct _stat64 crtstat = { 0 };
234  wchar_t *filename_w;
235  int ret;
236 
237  if (get_extended_win32_path(filename_utf8, &filename_w))
238  return -1;
239 
240  if (filename_w) {
241  ret = _wstat64(filename_w, &crtstat);
242  av_free(filename_w);
243  } else
244  ret = _stat64(filename_utf8, &crtstat);
245 
246  copy_stat(&crtstat, buf);
247 
248  return ret;
249 }
250 
251 static inline int win32_fstat(int fd, struct win32_stat *buf)
252 {
253  struct _stat64 crtstat = { 0 };
254  int ret;
255 
256  ret = _fstat64(fd, &crtstat);
257 
258  copy_stat(&crtstat, buf);
259 
260  return ret;
261 }
262 
263 static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
264 {
265  wchar_t *src_w, *dest_w;
266  int ret;
267 
268  if (get_extended_win32_path(src_utf8, &src_w))
269  return -1;
270  if (get_extended_win32_path(dest_utf8, &dest_w)) {
271  av_free(src_w);
272  return -1;
273  }
274  if (!src_w || !dest_w) {
275  av_free(src_w);
276  av_free(dest_w);
277  goto fallback;
278  }
279 
280  ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);
281  av_free(src_w);
282  av_free(dest_w);
283  // Lacking proper mapping from GetLastError() error codes to errno codes
284  if (ret)
285  errno = EPERM;
286  return ret;
287 
288 fallback:
289  /* filename may be be in CP_ACP */
290 #if !HAVE_UWP
291  ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
292  if (ret)
293  errno = EPERM;
294 #else
295  /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
296  * it is available but not allowed by the app certification kit. However,
297  * it's unlikely that anybody would input filenames in CP_ACP there, so this
298  * fallback is kept mostly for completeness. Alternatively we could
299  * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
300  * explicit conversions with CP_ACP is allegedly forbidden in windows
301  * store apps (or windows phone), and the notion of a native code page
302  * doesn't make much sense there. */
303  ret = rename(src_utf8, dest_utf8);
304 #endif
305  return ret;
306 }
307 
308 #define mkdir(a, b) win32_mkdir(a)
309 #define rename win32_rename
310 #define rmdir win32_rmdir
311 #define unlink win32_unlink
312 #define access win32_access
313 
314 #endif
315 
316 #endif /* AVFORMAT_OS_SUPPORT_H */
wchar_filename.h
is_dos_path
static int is_dos_path(const char *path)
Definition: os_support.h:97
ret
ret
Definition: filter_design.txt:187
mode
mode
Definition: ebur128.h:83
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
Generated on Wed Aug 24 2022 21:42:18 for FFmpeg by   doxygen 1.8.17