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 # define stat _stati64
53 # ifdef fstat
54 # undef fstat
55 # endif
56 # define fstat(f,s) _fstati64((f), (s))
57 #endif /* defined(_WIN32) */
58 
59 
60 #ifdef __ANDROID__
61 # if HAVE_UNISTD_H
62 # include <unistd.h>
63 # endif
64 # ifdef lseek
65 # undef lseek
66 # endif
67 # define lseek(f,p,w) lseek64((f), (p), (w))
68 #endif
69 
70 static inline int is_dos_path(const char *path)
71 {
72 #if HAVE_DOS_PATHS
73  if (path[0] && path[1] == ':')
74  return 1;
75 #endif
76  return 0;
77 }
78 
79 #if defined(_WIN32)
80 #ifndef S_IRUSR
81 #define S_IRUSR S_IREAD
82 #endif
83 #ifndef S_IWUSR
84 #define S_IWUSR S_IWRITE
85 #endif
86 #endif
87 
88 #if CONFIG_NETWORK
89 #if defined(_WIN32)
90 #define SHUT_RD SD_RECEIVE
91 #define SHUT_WR SD_SEND
92 #define SHUT_RDWR SD_BOTH
93 #else
94 #include <sys/socket.h>
95 #if !defined(SHUT_RD) /* OS/2, DJGPP */
96 #define SHUT_RD 0
97 #define SHUT_WR 1
98 #define SHUT_RDWR 2
99 #endif
100 #endif
101 
102 #if !HAVE_SOCKLEN_T
103 typedef int socklen_t;
104 #endif
105 
106 /* most of the time closing a socket is just closing an fd */
107 #if !HAVE_CLOSESOCKET
108 #define closesocket close
109 #endif
110 
111 #if !HAVE_POLL_H
112 typedef unsigned long nfds_t;
113 
114 #if HAVE_WINSOCK2_H
115 #include <winsock2.h>
116 #endif
117 #if !HAVE_STRUCT_POLLFD
118 struct pollfd {
119  int fd;
120  short events; /* events to look for */
121  short revents; /* events that occurred */
122 };
123 
124 /* events & revents */
125 #define POLLIN 0x0001 /* any readable data available */
126 #define POLLOUT 0x0002 /* file descriptor is writeable */
127 #define POLLRDNORM POLLIN
128 #define POLLWRNORM POLLOUT
129 #define POLLRDBAND 0x0008 /* priority readable data */
130 #define POLLWRBAND 0x0010 /* priority data can be written */
131 #define POLLPRI 0x0020 /* high priority readable data */
132 
133 /* revents only */
134 #define POLLERR 0x0004 /* errors pending */
135 #define POLLHUP 0x0080 /* disconnected */
136 #define POLLNVAL 0x1000 /* invalid file descriptor */
137 #endif
138 
139 
140 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
141 #define poll ff_poll
142 #endif /* HAVE_POLL_H */
143 #endif /* CONFIG_NETWORK */
144 
145 #ifdef _WIN32
146 #include <stdio.h>
147 #include <windows.h>
149 
150 #define DEF_FS_FUNCTION(name, wfunc, afunc) \
151 static inline int win32_##name(const char *filename_utf8) \
152 { \
153  wchar_t *filename_w; \
154  int ret; \
155  \
156  if (utf8towchar(filename_utf8, &filename_w)) \
157  return -1; \
158  if (!filename_w) \
159  goto fallback; \
160  \
161  ret = wfunc(filename_w); \
162  av_free(filename_w); \
163  return ret; \
164  \
165 fallback: \
166  /* filename may be be in CP_ACP */ \
167  return afunc(filename_utf8); \
168 }
169 
170 DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
171 DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
172 DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
173 
174 #define DEF_FS_FUNCTION2(name, wfunc, afunc, partype) \
175 static inline int win32_##name(const char *filename_utf8, partype par) \
176 { \
177  wchar_t *filename_w; \
178  int ret; \
179  \
180  if (utf8towchar(filename_utf8, &filename_w)) \
181  return -1; \
182  if (!filename_w) \
183  goto fallback; \
184  \
185  ret = wfunc(filename_w, par); \
186  av_free(filename_w); \
187  return ret; \
188  \
189 fallback: \
190  /* filename may be be in CP_ACP */ \
191  return afunc(filename_utf8, par); \
192 }
193 
194 DEF_FS_FUNCTION2(access, _waccess, _access, int)
195 DEF_FS_FUNCTION2(stat, _wstati64, _stati64, struct stat*)
196 
197 static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
198 {
199  wchar_t *src_w, *dest_w;
200  int ret;
201 
202  if (utf8towchar(src_utf8, &src_w))
203  return -1;
204  if (utf8towchar(dest_utf8, &dest_w)) {
205  av_free(src_w);
206  return -1;
207  }
208  if (!src_w || !dest_w) {
209  av_free(src_w);
210  av_free(dest_w);
211  goto fallback;
212  }
213 
214  ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);
215  av_free(src_w);
216  av_free(dest_w);
217  // Lacking proper mapping from GetLastError() error codes to errno codes
218  if (ret)
219  errno = EPERM;
220  return ret;
221 
222 fallback:
223  /* filename may be be in CP_ACP */
224 #if !HAVE_UWP
225  ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
226  if (ret)
227  errno = EPERM;
228 #else
229  /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
230  * it is available but not allowed by the app certification kit. However,
231  * it's unlikely that anybody would input filenames in CP_ACP there, so this
232  * fallback is kept mostly for completeness. Alternatively we could
233  * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
234  * explicit conversions with CP_ACP is allegedly forbidden in windows
235  * store apps (or windows phone), and the notion of a native code page
236  * doesn't make much sense there. */
237  ret = rename(src_utf8, dest_utf8);
238 #endif
239  return ret;
240 }
241 
242 #define mkdir(a, b) win32_mkdir(a)
243 #define rename win32_rename
244 #define rmdir win32_rmdir
245 #define unlink win32_unlink
246 #define access win32_access
247 
248 #endif
249 
250 #endif /* AVFORMAT_OS_SUPPORT_H */
static int is_dos_path(const char *path)
Definition: os_support.h:70
#define av_free(p)