8b720910d2
Add a variant of filetime_to_nstime() that takes a value that's like a FILETIME but in units of nanoseconds rather than tenths of a microsecond, and use that. (It looks as if they might just get FILETIME values from the OS and multiply them by 100, as the nanosecond-FILETIME values appear to be multiples of 100 in the captures I've seen, but they might have chosen nanosecond resolution in case they need to support a higher-resolution time stamp source, so we don't assume that the values will always be a multiple of 100.) Change-Id: If6a1cb2cb673688b042eb113b79cfd267f5454a5 Reviewed-on: https://code.wireshark.org/review/8150 Reviewed-by: Guy Harris <guy@alum.mit.edu>
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/* nstime.h
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* Definition of data structure to hold time values with nanosecond resolution
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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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#ifndef __NSTIME_H__
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#define __NSTIME_H__
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#include <time.h>
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#include "ws_symbol_export.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/** @file
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* Definition of data structure to hold time values with nanosecond resolution
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*/
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/** data structure to hold time values with nanosecond resolution*/
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typedef struct nstime_t {
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time_t secs;
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int nsecs;
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} nstime_t;
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/* functions */
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/** set the given nstime_t to zero */
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WS_DLL_PUBLIC void nstime_set_zero(nstime_t *nstime);
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/** is the given nstime_t currently zero? */
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WS_DLL_PUBLIC gboolean nstime_is_zero(nstime_t *nstime);
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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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WS_DLL_PUBLIC void nstime_set_unset(nstime_t *nstime);
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/* is the given nstime_t currently (0,maxint)? */
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WS_DLL_PUBLIC gboolean nstime_is_unset(const nstime_t *nstime);
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/** duplicate the current time
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*
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* a = b
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*/
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WS_DLL_PUBLIC void nstime_copy(nstime_t *a, const nstime_t *b);
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/** calculate the delta between two times (can be negative!)
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*
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* delta = b-a
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*
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* Note that it is acceptable for two or more of the arguments to point at the
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* same structure.
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*/
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WS_DLL_PUBLIC void nstime_delta(nstime_t *delta, const nstime_t *b, const nstime_t *a );
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/** calculate the sum of two times
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*
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* sum = a+b
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*
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* Note that it is acceptable for two or more of the arguments to point at the
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* same structure.
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*/
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WS_DLL_PUBLIC void nstime_sum(nstime_t *sum, const nstime_t *b, const nstime_t *a );
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/** sum += a */
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#define nstime_add(sum, a) nstime_sum(sum, sum, a)
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/** sum -= a */
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#define nstime_subtract(sum, a) nstime_delta(sum, sum, a)
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/** compare two times are return a value similar to memcmp() or strcmp().
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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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WS_DLL_PUBLIC int nstime_cmp (const nstime_t *a, const nstime_t *b );
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/** converts nstime to double, time base is milli seconds */
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WS_DLL_PUBLIC double nstime_to_msec(const nstime_t *nstime);
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/** converts nstime to double, time base is seconds */
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WS_DLL_PUBLIC double nstime_to_sec(const nstime_t *nstime);
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/** converts Windows FILETIME to nstime, returns TRUE on success,
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FALSE on failure */
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WS_DLL_PUBLIC gboolean filetime_to_nstime(nstime_t *nstime, guint64 filetime);
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/** converts time like Windows FILETIME, but expressed in nanoseconds
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rather than tenths of microseconds, to nstime, returns TRUE on success,
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FALSE on failure */
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WS_DLL_PUBLIC gboolean nsfiletime_to_nstime(nstime_t *nstime, guint64 nsfiletime);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __NSTIME_H__ */
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