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FFmpeg/libavformat/os_support.h
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* various OS-feature replacement utilities
* copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFORMAT_OS_SUPPORT_H
#define AVFORMAT_OS_SUPPORT_H
/**
* @file
* miscellaneous OS support macros and functions.
*/
#include "config.h"
#include <sys/stat.h>
#ifdef _WIN32
#if HAVE_DIRECT_H
#include <direct.h>
#endif
#if HAVE_IO_H
#include <io.h>
#endif
#endif
#ifdef _WIN32
# include <fcntl.h>
# include <stdint.h>
# ifdef lseek
# undef lseek
# endif
# define lseek(f,p,w) _lseeki64((f), (p), (w))
# ifdef stat
# undef stat
# endif
# define stat win32_stat
/*
* The POSIX definition for the stat() function uses a struct of the
* same name (struct stat), that why it takes this extra effort for
* redirecting/replacing the stat() function with our own one which
* is capable to handle long path names on Windows.
* The struct below roughly follows the POSIX definition. Time values
* are 64bit, but in cases when _USE_32BIT_TIME_T is defined, they
* will be set to values no larger than INT32_MAX which corresponds
* to file times up to the year 2038.
*/
struct win32_stat
{
_dev_t st_dev; /* ID of device containing file */
_ino_t st_ino; /* inode number */
unsigned short st_mode; /* protection */
short st_nlink; /* number of hard links */
short st_uid; /* user ID of owner */
short st_gid; /* group ID of owner */
_dev_t st_rdev; /* device ID (if special file) */
int64_t st_size; /* total size, in bytes */
int64_t st_atime; /* time of last access */
int64_t st_mtime; /* time of last modification */
int64_t st_ctime; /* time of last status change */
};
# ifdef fstat
# undef fstat
# endif
# define fstat win32_fstat
#endif /* defined(_WIN32) */
#ifdef __ANDROID__
# if HAVE_UNISTD_H
# include <unistd.h>
# endif
# ifdef lseek
# undef lseek
# endif
# define lseek(f,p,w) lseek64((f), (p), (w))
#endif
static inline int is_dos_path(const char *path)
{
#if HAVE_DOS_PATHS
if (path[0] && path[1] == ':')
return 1;
#endif
return 0;
}
#if defined(_WIN32)
#ifndef S_IRUSR
#define S_IRUSR S_IREAD
#endif
#ifndef S_IWUSR
#define S_IWUSR S_IWRITE
#endif
#endif
#if CONFIG_NETWORK
#if defined(_WIN32)
#define SHUT_RD SD_RECEIVE
#define SHUT_WR SD_SEND
#define SHUT_RDWR SD_BOTH
#else
#include <sys/socket.h>
#if !defined(SHUT_RD) /* OS/2, DJGPP */
#define SHUT_RD 0
#define SHUT_WR 1
#define SHUT_RDWR 2
#endif
#endif
#if !HAVE_SOCKLEN_T
typedef int socklen_t;
#endif
/* most of the time closing a socket is just closing an fd */
#if !HAVE_CLOSESOCKET
#define closesocket close
#endif
#if !HAVE_POLL_H
typedef unsigned long nfds_t;
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#if !HAVE_STRUCT_POLLFD
struct pollfd {
int fd;
short events; /* events to look for */
short revents; /* events that occurred */
};
/* events & revents */
#define POLLIN 0x0001 /* any readable data available */
#define POLLOUT 0x0002 /* file descriptor is writeable */
#define POLLRDNORM POLLIN
#define POLLWRNORM POLLOUT
#define POLLRDBAND 0x0008 /* priority readable data */
#define POLLWRBAND 0x0010 /* priority data can be written */
#define POLLPRI 0x0020 /* high priority readable data */
/* revents only */
#define POLLERR 0x0004 /* errors pending */
#define POLLHUP 0x0080 /* disconnected */
#define POLLNVAL 0x1000 /* invalid file descriptor */
#endif
int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout);
#define poll ff_poll
#endif /* HAVE_POLL_H */
#endif /* CONFIG_NETWORK */
#ifdef _WIN32
#include <stdio.h>
#include <windows.h>
#include "libavutil/mem.h"
#include "libavutil/wchar_filename.h"
#define DEF_FS_FUNCTION(name, wfunc, afunc) \
static inline int win32_##name(const char *filename_utf8) \
{ \
wchar_t *filename_w; \
int ret; \
\
if (get_extended_win32_path(filename_utf8, &filename_w)) \
return -1; \
if (!filename_w) \
goto fallback; \
\
ret = wfunc(filename_w); \
av_free(filename_w); \
return ret; \
\
fallback: \
/* filename may be be in CP_ACP */ \
return afunc(filename_utf8); \
}
DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
static inline int win32_access(const char *filename_utf8, int mode)
{
wchar_t *filename_w;
int ret;
if (get_extended_win32_path(filename_utf8, &filename_w))
return -1;
if (!filename_w)
goto fallback;
ret = _waccess(filename_w, mode);
av_free(filename_w);
return ret;
fallback:
return _access(filename_utf8, mode);
}
static inline void copy_stat(struct _stat64 *crtstat, struct win32_stat *buf)
{
buf->st_dev = crtstat->st_dev;
buf->st_ino = crtstat->st_ino;
buf->st_mode = crtstat->st_mode;
buf->st_nlink = crtstat->st_nlink;
buf->st_uid = crtstat->st_uid;
buf->st_gid = crtstat->st_gid;
buf->st_rdev = crtstat->st_rdev;
buf->st_size = crtstat->st_size;
buf->st_atime = crtstat->st_atime;
buf->st_mtime = crtstat->st_mtime;
buf->st_ctime = crtstat->st_ctime;
}
static inline int win32_stat(const char *filename_utf8, struct win32_stat *buf)
{
struct _stat64 crtstat = { 0 };
wchar_t *filename_w;
int ret;
if (get_extended_win32_path(filename_utf8, &filename_w))
return -1;
if (filename_w) {
ret = _wstat64(filename_w, &crtstat);
av_free(filename_w);
} else
ret = _stat64(filename_utf8, &crtstat);
copy_stat(&crtstat, buf);
return ret;
}
static inline int win32_fstat(int fd, struct win32_stat *buf)
{
struct _stat64 crtstat = { 0 };
int ret;
ret = _fstat64(fd, &crtstat);
copy_stat(&crtstat, buf);
return ret;
}
static inline int win32_rename(const char *src_utf8, const char *dest_utf8)
{
wchar_t *src_w, *dest_w;
int ret;
if (get_extended_win32_path(src_utf8, &src_w))
return -1;
if (get_extended_win32_path(dest_utf8, &dest_w)) {
av_free(src_w);
return -1;
}
if (!src_w || !dest_w) {
av_free(src_w);
av_free(dest_w);
goto fallback;
}
ret = MoveFileExW(src_w, dest_w, MOVEFILE_REPLACE_EXISTING);
av_free(src_w);
av_free(dest_w);
// Lacking proper mapping from GetLastError() error codes to errno codes
if (ret)
errno = EPERM;
return ret;
fallback:
/* filename may be be in CP_ACP */
#if !HAVE_UWP
ret = MoveFileExA(src_utf8, dest_utf8, MOVEFILE_REPLACE_EXISTING);
if (ret)
errno = EPERM;
#else
/* Windows Phone doesn't have MoveFileExA, and for Windows Store apps,
* it is available but not allowed by the app certification kit. However,
* it's unlikely that anybody would input filenames in CP_ACP there, so this
* fallback is kept mostly for completeness. Alternatively we could
* do MultiByteToWideChar(CP_ACP) and use MoveFileExW, but doing
* explicit conversions with CP_ACP is allegedly forbidden in windows
* store apps (or windows phone), and the notion of a native code page
* doesn't make much sense there. */
ret = rename(src_utf8, dest_utf8);
#endif
return ret;
}
#define mkdir(a, b) win32_mkdir(a)
#define rename win32_rename
#define rmdir win32_rmdir
#define unlink win32_unlink
#define access win32_access
#endif
#endif /* AVFORMAT_OS_SUPPORT_H */
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