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avformat/os_support: Support long file names on Windows

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Signed-off-by: softworkz <softworkz@hotmail.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
softworkz 2022-05-26 09:28:49 +00:00 committed by Martin Storsjö
parent c5aba39a04
commit bc8f1bbe23
1 changed files with 91 additions and 25 deletions
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116
libavformat/os_support.h
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@ -49,11 +49,38 @@
# ifdef stat
# undef stat
# endif
# define stat _stati64
# 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(f,s) _fstati64((f), (s))
# define fstat win32_fstat
#endif /* defined(_WIN32) */
@ -153,7 +180,7 @@ static inline int win32_##name(const char *filename_utf8) \
wchar_t *filename_w; \
int ret; \
\
if (utf8towchar(filename_utf8, &filename_w)) \
if (get_extended_win32_path(filename_utf8, &filename_w)) \
return -1; \
if (!filename_w) \
goto fallback; \
@ -171,37 +198,76 @@ DEF_FS_FUNCTION(unlink, _wunlink, _unlink)
DEF_FS_FUNCTION(mkdir, _wmkdir, _mkdir)
DEF_FS_FUNCTION(rmdir, _wrmdir , _rmdir)
#define DEF_FS_FUNCTION2(name, wfunc, afunc, partype) \
static inline int win32_##name(const char *filename_utf8, partype par) \
{ \
wchar_t *filename_w; \
int ret; \
\
if (utf8towchar(filename_utf8, &filename_w)) \
return -1; \
if (!filename_w) \
goto fallback; \
\
ret = wfunc(filename_w, par); \
av_free(filename_w); \
return ret; \
\
fallback: \
/* filename may be be in CP_ACP */ \
return afunc(filename_utf8, par); \
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);
}
DEF_FS_FUNCTION2(access, _waccess, _access, int)
DEF_FS_FUNCTION2(stat, _wstati64, _stati64, struct stat*)
static inline void copy_stat(struct _stati64 *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 _stati64 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 _stati64 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 (utf8towchar(src_utf8, &src_w))
if (get_extended_win32_path(src_utf8, &src_w))
return -1;
if (utf8towchar(dest_utf8, &dest_w)) {
if (get_extended_win32_path(dest_utf8, &dest_w)) {
av_free(src_w);
return -1;
}