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https://gitlab.gnome.org/GNOME/glib.git
synced 2024-09-20 01:06:15 +02:00
Support setting mtime and atime on local files on Windows
Since we (optionally) require nanosecond precision for this (utimes() is used on *nix), use SetFileTime(), which nominally has 100ns granularity (actual filesystem might be coarser), instead of g_utime (), which only has 1-second granularity.
This commit is contained in:
Руслан Ижбулатов
parent
d09a6690e4
commit
0550104cf8
@ -2123,7 +2123,7 @@ get_uint32 (const GFileAttributeValue *value,
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return TRUE;
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}
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#ifdef HAVE_UTIMES
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#if defined (HAVE_UTIMES) || defined (G_OS_WIN32)
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static gboolean
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get_uint64 (const GFileAttributeValue *value,
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guint64 *val_out,
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@ -2356,7 +2356,180 @@ set_symlink (char *filename,
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}
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#endif
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#ifdef HAVE_UTIMES
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#if defined (G_OS_WIN32)
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/* From
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* https://support.microsoft.com/en-ca/help/167296/how-to-convert-a-unix-time-t-to-a-win32-filetime-or-systemtime
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* FT = UT * 10000000 + 116444736000000000.
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* Converts unix epoch time (a signed 64-bit integer) to FILETIME.
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* Can optionally use a more precise timestamp that has
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* a fraction of a second expressed in nanoseconds.
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* UT must be between January 1st of year 1601 and December 31st of year 30827.
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* nsec must be non-negative and < 1000000000.
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* Returns TRUE if conversion succeeded, FALSE otherwise.
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*
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* The function that does the reverse can be found in
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* glib/gstdio.c.
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*/
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static gboolean
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_g_win32_unix_time_to_filetime (gint64 ut,
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gint32 nsec,
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FILETIME *ft,
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GError **error)
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{
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gint64 result;
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/* 1 unit of FILETIME is 100ns */
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const gint64 hundreds_of_usec_per_sec = 10000000;
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/* The difference between January 1, 1601 UTC (FILETIME epoch) and UNIX epoch
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* in hundreds of nanoseconds.
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*/
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const gint64 filetime_unix_epoch_offset = 116444736000000000;
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/* This is the maximum timestamp that SYSTEMTIME can
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* represent (last millisecond of the year 30827).
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* Since FILETIME and SYSTEMTIME are both used on Windows,
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* we use this as a limit (FILETIME can support slightly
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* larger interval, up to year 30828).
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*/
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const gint64 max_systemtime = 0x7fff35f4f06c58f0;
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g_return_val_if_fail (ft != NULL, FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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if (nsec < 0)
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{
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g_set_error (error, G_IO_ERROR,
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G_IO_ERROR_INVALID_DATA,
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_("Extra nanoseconds %d for UNIX timestamp %lld are negative"),
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nsec, ut);
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return FALSE;
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}
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if (nsec >= hundreds_of_usec_per_sec * 100)
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{
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g_set_error (error, G_IO_ERROR,
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G_IO_ERROR_INVALID_DATA,
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_("Extra nanoseconds %d for UNIX timestamp %lld reach 1 second"),
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nsec, ut);
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return FALSE;
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}
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if (ut >= (G_MAXINT64 / hundreds_of_usec_per_sec) ||
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(ut * hundreds_of_usec_per_sec) >= (G_MAXINT64 - filetime_unix_epoch_offset))
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{
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g_set_error (error, G_IO_ERROR,
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G_IO_ERROR_INVALID_DATA,
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_("UNIX timestamp %lld does not fit into 64 bits"),
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ut);
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return FALSE;
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}
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result = ut * hundreds_of_usec_per_sec + filetime_unix_epoch_offset + nsec / 100;
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if (result >= max_systemtime || result < 0)
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{
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g_set_error (error, G_IO_ERROR,
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G_IO_ERROR_INVALID_DATA,
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_("UNIX timestamp %lld is outside of the range supported by Windows"),
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ut);
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return FALSE;
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}
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ft->dwLowDateTime = (DWORD) (result);
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ft->dwHighDateTime = (DWORD) (result >> 32);
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return TRUE;
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}
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static gboolean
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set_mtime_atime (const char *filename,
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const GFileAttributeValue *mtime_value,
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const GFileAttributeValue *mtime_usec_value,
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const GFileAttributeValue *atime_value,
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const GFileAttributeValue *atime_usec_value,
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GError **error)
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{
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BOOL res;
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guint64 val = 0;
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guint32 val_usec = 0;
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gunichar2 *filename_utf16;
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SECURITY_ATTRIBUTES sec = { sizeof (SECURITY_ATTRIBUTES), NULL, FALSE };
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HANDLE file_handle;
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FILETIME mtime;
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FILETIME atime;
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FILETIME *p_mtime = NULL;
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FILETIME *p_atime = NULL;
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DWORD gle;
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/* ATIME */
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if (atime_value)
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{
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if (!get_uint64 (atime_value, &val, error))
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return FALSE;
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val_usec = 0;
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if (atime_usec_value &&
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!get_uint32 (atime_usec_value, &val_usec, error))
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return FALSE;
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if (!_g_win32_unix_time_to_filetime (val, val_usec, &atime, error))
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return FALSE;
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p_atime = &atime;
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}
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/* MTIME */
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if (mtime_value)
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{
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if (!get_uint64 (mtime_value, &val, error))
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return FALSE;
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val_usec = 0;
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if (mtime_usec_value &&
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!get_uint32 (mtime_usec_value, &val_usec, error))
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return FALSE;
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if (!_g_win32_unix_time_to_filetime (val, val_usec, &mtime, error))
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return FALSE;
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p_mtime = &mtime;
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}
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filename_utf16 = g_utf8_to_utf16 (filename, -1, NULL, NULL, error);
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if (filename_utf16 == NULL)
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{
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g_prefix_error (error,
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_("File name “%s” cannot be converted to UTF-16"),
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filename);
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return FALSE;
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}
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file_handle = CreateFileW (filename_utf16,
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FILE_WRITE_ATTRIBUTES,
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FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE,
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&sec,
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OPEN_EXISTING,
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FILE_FLAG_BACKUP_SEMANTICS,
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NULL);
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gle = GetLastError ();
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g_clear_pointer (&filename_utf16, g_free);
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if (file_handle == INVALID_HANDLE_VALUE)
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{
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (gle),
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_("File “%s” cannot be opened: Windows Error %lu"),
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filename, gle);
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return FALSE;
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}
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res = SetFileTime (file_handle, NULL, p_atime, p_mtime);
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gle = GetLastError ();
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CloseHandle (file_handle);
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if (!res)
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g_set_error (error, G_IO_ERROR,
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g_io_error_from_errno (gle),
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_("Error setting modification or access time for file “%s”: %lu"),
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filename, gle);
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return res;
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}
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#elif defined (HAVE_UTIMES)
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static int
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lazy_stat (char *filename,
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struct stat *statbuf,
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@ -2536,7 +2709,7 @@ _g_local_file_info_set_attribute (char *filename,
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return set_symlink (filename, &value, error);
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#endif
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#ifdef HAVE_UTIMES
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#if defined (HAVE_UTIMES) || defined (G_OS_WIN32)
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else if (strcmp (attribute, G_FILE_ATTRIBUTE_TIME_MODIFIED) == 0)
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return set_mtime_atime (filename, &value, NULL, NULL, NULL, error);
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else if (strcmp (attribute, G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC) == 0)
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@ -2603,9 +2776,11 @@ _g_local_file_info_set_attributes (char *filename,
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GFileAttributeValue *value;
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#ifdef G_OS_UNIX
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GFileAttributeValue *uid, *gid;
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#ifdef HAVE_UTIMES
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#endif
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#if defined (HAVE_UTIMES) || defined (G_OS_WIN32)
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GFileAttributeValue *mtime, *mtime_usec, *atime, *atime_usec;
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#endif
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#if defined (G_OS_UNIX) || defined (G_OS_WIN32)
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GFileAttributeStatus status;
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#endif
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gboolean res;
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@ -2676,7 +2851,7 @@ _g_local_file_info_set_attributes (char *filename,
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}
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#ifdef HAVE_UTIMES
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#if defined (HAVE_UTIMES) || defined (G_OS_WIN32)
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/* Group all time settings into one call
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* Change times as the last thing to avoid it changing due to metadata changes
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*/
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@ -166,6 +166,9 @@ _g_win32_fix_mode (wchar_t *mode)
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* UT = (FT - 116444736000000000) / 10000000.
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* Converts FILETIME to unix epoch time in form
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* of a signed 64-bit integer (can be negative).
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*
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* The function that does the reverse can be found in
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* gio/glocalfileinfo.c.
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*/
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static gint64
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_g_win32_filetime_to_unix_time (const FILETIME *ft,
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