![Bill Meier](/assets/img/avatar_default.png)
Change-Id: I4667fd4091c510a4c798f79dae333a07dc42dad6 Reviewed-on: https://code.wireshark.org/review/8880 Reviewed-by: Bill Meier <wmeier@newsguy.com>
318 lines
8.7 KiB
C
318 lines
8.7 KiB
C
/* nstime.c
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* Routines for manipulating nstime_t structures
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*
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* Copyright (c) 2005 MX Telecom Ltd. <richardv@mxtelecom.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <glib.h>
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#include "nstime.h"
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/* this is #defined so that we can clearly see that we have the right number of
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zeros, rather than as a guard against the number of nanoseconds in a second
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changing ;) */
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#define NS_PER_S 1000000000
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/* set the given nstime_t to zero */
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void nstime_set_zero(nstime_t *nstime)
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{
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nstime->secs = 0;
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nstime->nsecs = 0;
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}
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/* is the given nstime_t currently zero? */
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gboolean nstime_is_zero(nstime_t *nstime)
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{
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if(nstime->secs == 0 && nstime->nsecs == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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/* set the given nstime_t to (0,maxint) to mark it as "unset"
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* That way we can find the first frame even when a timestamp
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* is zero (fix for bug 1056)
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*/
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void nstime_set_unset(nstime_t *nstime)
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{
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nstime->secs = 0;
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nstime->nsecs = G_MAXINT;
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}
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/* is the given nstime_t currently (0,maxint)? */
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gboolean nstime_is_unset(const nstime_t *nstime)
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{
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if(nstime->secs == 0 && nstime->nsecs == G_MAXINT) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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/** funcion: nstime_copy
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*
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* a = b
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*/
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void nstime_copy(nstime_t *a, const nstime_t *b)
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{
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a->secs = b->secs;
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a->nsecs = b->nsecs;
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}
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/*
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* function: nstime_delta
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* delta = b - a
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*/
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void nstime_delta(nstime_t *delta, const nstime_t *b, const nstime_t *a )
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{
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if (b->secs == a->secs) {
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/* The seconds part of b is the same as the seconds part of a, so if
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the nanoseconds part of the first time is less than the nanoseconds
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part of a, b is before a. The nanoseconds part of the delta should
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just be the difference between the nanoseconds part of b and the
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nanoseconds part of a; don't adjust the seconds part of the delta,
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as it's OK if the nanoseconds part is negative, and an overflow
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can never result. */
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delta->secs = 0;
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delta->nsecs = b->nsecs - a->nsecs;
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} else if (b->secs <= a->secs) {
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/* The seconds part of b is less than the seconds part of a, so b is
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before a.
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Both the "seconds" and "nanoseconds" value of the delta
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should have the same sign, so if the difference between the
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nanoseconds values would be *positive*, subtract 1,000,000,000
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from it, and add one to the seconds value. */
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delta->secs = b->secs - a->secs;
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delta->nsecs = b->nsecs - a->nsecs;
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if(delta->nsecs > 0) {
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delta->nsecs -= NS_PER_S;
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delta->secs ++;
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}
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} else {
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delta->secs = b->secs - a->secs;
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delta->nsecs = b->nsecs - a->nsecs;
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if(delta->nsecs < 0) {
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delta->nsecs += NS_PER_S;
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delta->secs --;
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}
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}
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}
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/*
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* function: nstime_sum
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* sum = a + b
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*/
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void nstime_sum(nstime_t *sum, const nstime_t *a, const nstime_t *b)
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{
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sum->secs = a->secs + b->secs;
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sum->nsecs = a->nsecs + b->nsecs;
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if(sum->nsecs>=NS_PER_S || (sum->nsecs>0 && sum->secs<0)){
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sum->nsecs-=NS_PER_S;
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sum->secs++;
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} else if(sum->nsecs<=-NS_PER_S || (sum->nsecs<0 && sum->secs>0)) {
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sum->nsecs+=NS_PER_S;
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sum->secs--;
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}
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}
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/*
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* function: nstime_cmp
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*
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* a > b : > 0
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* a = b : 0
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* a < b : < 0
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*/
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int nstime_cmp (const nstime_t *a, const nstime_t *b )
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{
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if (G_UNLIKELY(nstime_is_unset(a))) {
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if (G_UNLIKELY(nstime_is_unset(b))) {
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return 0; /* "no time stamp" is "equal" to "no time stamp" */
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} else {
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return -1; /* and is less than all time stamps */
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}
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} else {
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if (G_UNLIKELY(nstime_is_unset(b))) {
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return 1;
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}
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}
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if (a->secs == b->secs) {
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return a->nsecs - b->nsecs;
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} else {
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return (int) (a->secs - b->secs);
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}
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}
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/*
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* function: nstime_to_msec
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* converts nstime to double, time base is milli seconds
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*/
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double nstime_to_msec(const nstime_t *nstime)
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{
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return ((double)nstime->secs*1000 + (double)nstime->nsecs/1000000);
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}
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/*
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* function: nstime_to_sec
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* converts nstime to double, time base is seconds
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*/
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double nstime_to_sec(const nstime_t *nstime)
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{
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return ((double)nstime->secs + (double)nstime->nsecs/NS_PER_S);
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}
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/*
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* This code is based on the Samba code:
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*
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* Unix SMB/Netbios implementation.
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* Version 1.9.
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* time handling functions
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* Copyright (C) Andrew Tridgell 1992-1998
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*/
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/*
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* Number of seconds between the UN*X epoch (January 1, 1970, 00:00:00 GMT)
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* and the Windows NT epoch (January 1, 1601 in the proleptic Gregorian
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* calendar, 00:00:00 "GMT")
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*
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* This is
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*
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* 369*365.25*24*60*60-(3*24*60*60+6*60*60)
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*
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* 1970-1601 is 369; 365.25 is the average length of a year in days,
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* including leap years.
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*
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* 3 days are subtracted because 1700, 1800, and 1900 were not leap
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* years, as, while they're all evenly divisible by 4, they're also
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* evently divisible by 100, but not evently divisible by 400, so
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* we need to compensate for using the average length of a year in
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* days, which assumes a leap year every 4 years, *including* every
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* 100 years.
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*
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* I'm not sure what the extra 6 hours are that are being subtracted.
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*/
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#define TIME_FIXUP_CONSTANT G_GUINT64_CONSTANT(11644473600)
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#ifndef TIME_T_MIN
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#define TIME_T_MIN ((time_t) ((time_t)0 < (time_t) -1 ? (time_t) 0 \
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: ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1)))
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#endif
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#ifndef TIME_T_MAX
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#define TIME_T_MAX ((time_t) (~ (time_t) 0 - TIME_T_MIN))
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#endif
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static gboolean
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common_filetime_to_nstime(nstime_t *nstime, guint64 ftsecs, int nsecs)
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{
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gint64 secs;
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/* The next two lines are a fix needed for the
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broken SCO compiler. JRA. */
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time_t l_time_min = TIME_T_MIN;
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time_t l_time_max = TIME_T_MAX;
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/*
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* Shift the seconds from the Windows epoch to the UN*X epoch.
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* ftsecs's value should fit in a 64-bit signed variable, as
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* ftsecs is derived from a 64-bit fractions-of-a-second value,
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* and is far from the maximum 64-bit signed value, and
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* TIME_FIXUP_CONSTANT is also far from the maximum 64-bit
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* signed value, so the difference between them should also
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* fit in a 64-bit signed value.
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*/
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secs = (gint64)ftsecs - TIME_FIXUP_CONSTANT;
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if (!(l_time_min <= secs && secs <= l_time_max)) {
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/* The result won't fit in a time_t */
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return FALSE;
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}
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/*
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* Get the time as seconds and nanoseconds.
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*/
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nstime->secs = (time_t) secs;
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nstime->nsecs = nsecs;
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return TRUE;
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}
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/*
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* function: filetime_to_nstime
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* converts a Windows FILETIME value to an nstime_t
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* returns TRUE if the conversion succeeds, FALSE if it doesn't
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* (for example, with a 32-bit time_t, the time overflows or
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* underflows time_t)
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*/
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gboolean
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filetime_to_nstime(nstime_t *nstime, guint64 filetime)
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{
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guint64 ftsecs;
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int nsecs;
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/*
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* Split into seconds and tenths of microseconds, and
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* then convert tenths of microseconds to nanoseconds.
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*/
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ftsecs = filetime / 10000000;
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nsecs = (int)((filetime % 10000000)*100);
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return common_filetime_to_nstime(nstime, ftsecs, nsecs);
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}
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/*
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* function: nsfiletime_to_nstime
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* converts a Windows FILETIME-like value, but given in nanoseconds
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* rather than 10ths of microseconds, to an nstime_t
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* returns TRUE if the conversion succeeds, FALSE if it doesn't
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* (for example, with a 32-bit time_t, the time overflows or
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* underflows time_t)
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*/
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gboolean
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nsfiletime_to_nstime(nstime_t *nstime, guint64 nsfiletime)
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{
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guint64 ftsecs;
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int nsecs;
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/* Split into seconds and nanoseconds. */
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ftsecs = nsfiletime / NS_PER_S;
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nsecs = (int)(nsfiletime % NS_PER_S);
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return common_filetime_to_nstime(nstime, ftsecs, nsecs);
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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