Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 
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 # undef lseek
46 # define lseek(f,p,w) _lseeki64((f), (p), (w))
47 # undef stat
48 # define stat _stati64
49 # undef fstat
50 # define fstat(f,s) _fstati64((f), (s))
51 #endif /* defined(_WIN32) && !defined(__MINGW32CE__) */
52 
53 static inline int is_dos_path(const char *path)
54 {
55 #if HAVE_DOS_PATHS
56  if (path[0] && path[1] == ':')
57  return 1;
58 #endif
59  return 0;
60 }
61 
62 #if defined(__OS2__) || defined(__Plan9__)
63 #define SHUT_RD 0
64 #define SHUT_WR 1
65 #define SHUT_RDWR 2
66 #endif
67 
68 #if defined(_WIN32)
69 #define SHUT_RD SD_RECEIVE
70 #define SHUT_WR SD_SEND
71 #define SHUT_RDWR SD_BOTH
72 
73 #ifndef S_IRUSR
74 #define S_IRUSR S_IREAD
75 #endif
76 #ifndef S_IWUSR
77 #define S_IWUSR S_IWRITE
78 #endif
79 #endif
80 
81 #if CONFIG_NETWORK
82 #if !HAVE_SOCKLEN_T
83 typedef int socklen_t;
84 #endif
85 
86 /* most of the time closing a socket is just closing an fd */
87 #if !HAVE_CLOSESOCKET
88 #define closesocket close
89 #endif
90 
91 #if !HAVE_POLL_H
92 typedef unsigned long nfds_t;
93 
94 #if HAVE_WINSOCK2_H
95 #include <winsock2.h>
96 #endif
97 #if !HAVE_STRUCT_POLLFD
98 struct pollfd {
99  int fd;
100  short events; /* events to look for */
101  short revents; /* events that occurred */
102 };
103 
104 /* events & revents */
105 #define POLLIN 0x0001 /* any readable data available */
106 #define POLLOUT 0x0002 /* file descriptor is writeable */
107 #define POLLRDNORM POLLIN
108 #define POLLWRNORM POLLOUT
109 #define POLLRDBAND 0x0008 /* priority readable data */
110 #define POLLWRBAND 0x0010 /* priority data can be written */
111 #define POLLPRI 0x0020 /* high priority readable data */
112 
113 /* revents only */
114 #define POLLERR 0x0004 /* errors pending */
115 #define POLLHUP 0x0080 /* disconnected */
116 #define POLLNVAL 0x1000 /* invalid file descriptor */
117 #endif
118 
119 
120 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
121 #define poll ff_poll
122 #endif /* HAVE_POLL_H */
123 #endif /* CONFIG_NETWORK */
124 
125 #if defined(__MINGW32CE__)
126 #define mkdir(a, b) _mkdir(a)
127 #elif defined(_WIN32)
128 #include <stdio.h>
129 #include <windows.h>
131 
132 #ifdef WINAPI_FAMILY
133 #include <winapifamily.h>
134 // If a WINAPI_FAMILY is defined, check that the desktop API subset
135 // is enabled
136 #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
137 #define USE_MOVEFILEEXA
138 #endif
139 #else
140 // If no WINAPI_FAMILY is defined, assume the full API subset
141 #define USE_MOVEFILEEXA
142 #endif
143 
144 #define DEF_FS_FUNCTION(name, wfunc, afunc) \
145 static inline int win32_##name(const char *filename_utf8) \
146 { \
147  wchar_t *filename_w; \
148  int ret; \
149  \
150  if (utf8towchar(filename_utf8, &filename_w)) \
151  return -1; \
152  if (!filename_w) \
153  goto fallback; \
154  \
155  ret = wfunc(filename_w); \
156  av_free(filename_w); \
157  return ret; \
158  \
159 fallback: \
160  /* filename may be be in CP_ACP */ \
161  return afunc(filename_utf8); \
162 }
163 
164 DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
165 DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
166 DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
167 
168 static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
169 {
170  wchar_t *src_w, *dest_w;
171  int ret;
172 
173  if (utf8towchar(src_utf8, &src_w))
174  return -1;
175  if (utf8towchar(dest_utf8, &dest_w)) {
176  av_free(src_w);
177  return -1;
178  }
179  if (!src_w || !dest_w) {
180  av_free(src_w);
181  av_free(dest_w);
182  goto fallback;
183  }
184 
185  ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);
186  av_free(src_w);
187  av_free(dest_w);
188  // Lacking proper mapping from GetLastError() error codes to errno codes
189  if (ret)
190  errno = EPERM;
191  return ret;
192 
193 fallback:
194  /* filename may be be in CP_ACP */
195 #ifdef USE_MOVEFILEEXA
196  ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
197  if (ret)
198  errno = EPERM;
199 #else
200  /* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
201  * it is available but not allowed by the app certification kit. However,
202  * it's unlikely that anybody would input filenames in CP_ACP there, so this
203  * fallback is kept mostly for completeness. Alternatively we could
204  * do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
205  * explicit conversions with CP_ACP is allegedly forbidden in windows
206  * store apps (or windows phone), and the notion of a native code page
207  * doesn't make much sense there. */
208  ret = rename(src_utf8, dest_utf8);
209 #endif
210  return ret;
211 }
212 
213 #define mkdir(a, b) win32_mkdir(a)
214 #define rename win32_rename
215 #define rmdir win32_rmdir
216 #define unlink win32_unlink
217 
218 #endif
219 
220 #endif /* AVFORMAT_OS_SUPPORT_H */
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
static int is_dos_path(const char *path)
Definition: os_support.h:53