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Normalize negative pre-1970 FILETIME timestamps via windows_time2stat

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This commit is contained in:
Andrea Mazzoleni 2026-08-16 21:32:42 +02:00
parent a8ffcec127
commit f9626f6e3e
1 changed files with 25 additions and 31 deletions
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56
os/mingw.c
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@ -422,6 +422,28 @@ static void windows_attr2stat(DWORD FileAttributes, DWORD ReparseTag, struct win
st->st_hidden = (FileAttributes & FILE_ATTRIBUTE_HIDDEN) != 0;
}
/**
* Convert Windows FILETIME to the Unix stat format.
*
* How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
* http://support.microsoft.com/kb/167296
*/
static void windows_time2stat(int64_t filetime, struct windows_stat* st)
{
int64_t mtime = filetime - 116444736000000000LL;
int64_t sec = mtime / 10000000;
int64_t rem = mtime % 10000000;
/* in C99, negative division truncates towards zero; normalize so that rem >= 0 */
if (rem < 0) {
--sec;
rem += 10000000;
}
st->st_mtime = sec;
st->st_mtimensec = rem * 100;
}
/**
* Convert Windows info to the Unix stat format.
*/
@ -439,15 +461,7 @@ static int windows_info2stat(const BY_HANDLE_FILE_INFORMATION* info, const FILE_
mtime <<= 32;
mtime |= info->ftLastWriteTime.dwLowDateTime;
/*
* Convert to unix time
*
* How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
* http://support.microsoft.com/kb/167296
*/
mtime -= 116444736000000000LL;
st->st_mtime = mtime / 10000000;
st->st_mtimensec = (mtime % 10000000) * 100;
windows_time2stat(mtime, st);
st->st_ino = info->nFileIndexHigh;
st->st_ino <<= 32;
@ -512,8 +526,6 @@ static int windows_info2stat(const BY_HANDLE_FILE_INFORMATION* info, const FILE_
*/
static int windows_stream2stat(const BY_HANDLE_FILE_INFORMATION* info, const FILE_ID_BOTH_DIR_INFO* stream, struct windows_stat* st)
{
int64_t mtime;
/*
* The FILE_ID_BOTH_DIR_INFO doesn't have the ReparseTag information
* we could use instead FILE_ID_EXTD_DIR_INFO, but it's available only
@ -523,17 +535,7 @@ static int windows_stream2stat(const BY_HANDLE_FILE_INFORMATION* info, const FIL
st->st_size = stream->EndOfFile.QuadPart;
mtime = stream->LastWriteTime.QuadPart;
/*
* Convert to unix time
*
* How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
* http://support.microsoft.com/kb/167296
*/
mtime -= 116444736000000000LL;
st->st_mtime = mtime / 10000000;
st->st_mtimensec = (mtime % 10000000) * 100;
windows_time2stat(stream->LastWriteTime.QuadPart, st);
st->st_ino = stream->FileId.QuadPart;
@ -568,15 +570,7 @@ static void windows_finddata2stat(const WIN32_FIND_DATAW* info, struct windows_s
mtime <<= 32;
mtime |= info->ftLastWriteTime.dwLowDateTime;
/*
* Convert to unix time
*
* How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
* http://support.microsoft.com/kb/167296
*/
mtime -= 116444736000000000LL;
st->st_mtime = mtime / 10000000;
st->st_mtimensec = (mtime % 10000000) * 100;
windows_time2stat(mtime, st);
/* No inode information available */
st->st_ino = INODE_INVALID;