45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Copyright (c) International Business Machines Corp., 2002,2008
|
||
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
||
|
|
*
|
||
|
|
* Error mapping routines from Samba libsmb/errormap.c
|
||
|
|
* Copyright (C) Andrew Tridgell 2001
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "glob.h"
|
||
|
|
#include "smberr.h"
|
||
|
|
#include "nterr.h"
|
||
|
|
#include "time_wrappers.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
|
||
|
|
* into Unix UTC (based 1970-01-01, in seconds).
|
||
|
|
*/
|
||
|
|
struct timespec64 ksmbd_NTtimeToUnix(__le64 ntutc)
|
||
|
|
{
|
||
|
|
struct timespec64 ts;
|
||
|
|
|
||
|
|
/* Subtract the NTFS time offset, then convert to 1s intervals. */
|
||
|
|
s64 t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
|
||
|
|
u64 abs_t;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Unfortunately can not use normal 64 bit division on 32 bit arch, but
|
||
|
|
* the alternative, do_div, does not work with negative numbers so have
|
||
|
|
* to special case them
|
||
|
|
*/
|
||
|
|
if (t < 0) {
|
||
|
|
abs_t = -t;
|
||
|
|
ts.tv_nsec = do_div(abs_t, 10000000) * 100;
|
||
|
|
ts.tv_nsec = -ts.tv_nsec;
|
||
|
|
ts.tv_sec = -abs_t;
|
||
|
|
} else {
|
||
|
|
abs_t = t;
|
||
|
|
ts.tv_nsec = do_div(abs_t, 10000000) * 100;
|
||
|
|
ts.tv_sec = abs_t;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ts;
|
||
|
|
}
|