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os_support.h
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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 #if defined(_WIN32) && !defined(__MINGW32CE__)
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) && !defined(__MINGW32CE__) */
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(__OS2__)
80 #define SHUT_RD 0
81 #define SHUT_WR 1
82 #define SHUT_RDWR 2
83 #endif
84 
85 #if defined(_WIN32)
86 #define SHUT_RD SD_RECEIVE
87 #define SHUT_WR SD_SEND
88 #define SHUT_RDWR SD_BOTH
89 
90 #ifndef S_IRUSR
91 #define S_IRUSR S_IREAD
92 #endif
93 #ifndef S_IWUSR
94 #define S_IWUSR S_IWRITE
95 #endif
96 #endif
97 
98 #if CONFIG_NETWORK
99 #if !HAVE_SOCKLEN_T
100 typedef int socklen_t;
101 #endif
102 
103 /* most of the time closing a socket is just closing an fd */
104 #if !HAVE_CLOSESOCKET
105 #define closesocket close
106 #endif
107 
108 #if !HAVE_POLL_H
109 typedef unsigned long nfds_t;
110 
111 #if HAVE_WINSOCK2_H
112 #include <winsock2.h>
113 #endif
114 #if !HAVE_STRUCT_POLLFD
115 struct pollfd {
116  int fd;
117  short events; /* events to look for */
118  short revents; /* events that occurred */
119 };
120 
121 /* events & revents */
122 #define POLLIN 0x0001 /* any readable data available */
123 #define POLLOUT 0x0002 /* file descriptor is writeable */
124 #define POLLRDNORM POLLIN
125 #define POLLWRNORM POLLOUT
126 #define POLLRDBAND 0x0008 /* priority readable data */
127 #define POLLWRBAND 0x0010 /* priority data can be written */
128 #define POLLPRI 0x0020 /* high priority readable data */
129 
130 /* revents only */
131 #define POLLERR 0x0004 /* errors pending */
132 #define POLLHUP 0x0080 /* disconnected */
133 #define POLLNVAL 0x1000 /* invalid file descriptor */
134 #endif
135 
136 
137 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
138 #define poll ff_poll
139 #endif /* HAVE_POLL_H */
140 #endif /* CONFIG_NETWORK */
141 
142 #if defined(__MINGW32CE__)
143 #define mkdir(a, b) _mkdir(a)
144 #elif defined(_WIN32)
145 #include <stdio.h>
146 #include <windows.h>
148 
149 #ifdef WINAPI_FAMILY
150 #include <winapifamily.h>
151 // If a WINAPI_FAMILY is defined, check that the desktop API subset
152 // is enabled
153 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
154 #define USE_MOVEFILEEXA
155 #endif
156 #else
157 // If no WINAPI_FAMILY is defined, assume the full API subset
158 #define USE_MOVEFILEEXA
159 #endif
160 
161 #define DEF_FS_FUNCTION(name, wfunc, afunc) \
162 static inline int win32_##name(const char *filename_utf8) \
163 { \
164  wchar_t *filename_w; \
165  int ret; \
166  \
167  if (utf8towchar(filename_utf8, &filename_w)) \
168  return -1; \
169  if (!filename_w) \
170  goto fallback; \
171  \
172  ret = wfunc(filename_w); \
173  av_free(filename_w); \
174  return ret; \
175  \
176 fallback: \
177  /* filename may be be in CP_ACP */ \
178  return afunc(filename_utf8); \
179 }
180 
181 DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
182 DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
183 DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
184 
185 #define DEF_FS_FUNCTION2(name, wfunc, afunc, partype) \
186 static inline int win32_##name(const char *filename_utf8, partype par) \
187 { \
188  wchar_t *filename_w; \
189  int ret; \
190  \
191  if (utf8towchar(filename_utf8, &filename_w)) \
192  return -1; \
193  if (!filename_w) \
194  goto fallback; \
195  \
196  ret = wfunc(filename_w, par); \
197  av_free(filename_w); \
198  return ret; \
199  \
200 fallback: \
201  /* filename may be be in CP_ACP */ \
202  return afunc(filename_utf8, par); \
203 }
204 
205 DEF_FS_FUNCTION2(access, _waccess, _access, int)
206 DEF_FS_FUNCTION2(stat, _wstati64, _stati64, struct stat*)
207 
208 static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
209 {
210  wchar_t *src_w, *dest_w;
211  int ret;
212 
213  if (utf8towchar(src_utf8, &src_w))
214  return -1;
215  if (utf8towchar(dest_utf8, &dest_w)) {
216  av_free(src_w);
217  return -1;
218  }
219  if (!src_w || !dest_w) {
220  av_free(src_w);
221  av_free(dest_w);
222  goto fallback;
223  }
224 
225  ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);
226  av_free(src_w);
227  av_free(dest_w);
228  // Lacking proper mapping from GetLastError() error codes to errno codes
229  if (ret)
230  errno = EPERM;
231  return ret;
232 
233 fallback:
234  /* filename may be be in CP_ACP */
235 #ifdef USE_MOVEFILEEXA
236  ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
237  if (ret)
238  errno = EPERM;
239 #else
240  /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
241  * it is available but not allowed by the app certification kit. However,
242  * it's unlikely that anybody would input filenames in CP_ACP there, so this
243  * fallback is kept mostly for completeness. Alternatively we could
244  * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
245  * explicit conversions with CP_ACP is allegedly forbidden in windows
246  * store apps (or windows phone), and the notion of a native code page
247  * doesn't make much sense there. */
248  ret = rename(src_utf8, dest_utf8);
249 #endif
250  return ret;
251 }
252 
253 #define mkdir(a, b) win32_mkdir(a)
254 #define rename win32_rename
255 #define rmdir win32_rmdir
256 #define unlink win32_unlink
257 #define access win32_access
258 
259 #endif
260 
261 #endif /* AVFORMAT_OS_SUPPORT_H */
static int is_dos_path(const char *path)
Definition: os_support.h:70
#define av_free(p)