ref: bfe9da47cfa2f51ebef78c59332b5ba2deba306d
dir: /third_party/boringssl/src/crypto/asn1/time_support.c/
/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
* project 2001.
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2008.
*/
/* ====================================================================
* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#if !defined(_POSIX_C_SOURCE)
#define _POSIX_C_SOURCE 201410L /* for gmtime_r */
#endif
#include "internal.h"
#include <time.h>
#define SECS_PER_DAY (24 * 60 * 60)
struct tm *OPENSSL_gmtime(const time_t *time, struct tm *result) {
#if defined(OPENSSL_WINDOWS)
if (gmtime_s(result, time)) {
return NULL;
}
return result;
#else
return gmtime_r(time, result);
#endif
}
/* Convert date to and from julian day Uses Fliegel & Van Flandern algorithm */
static long date_to_julian(int y, int m, int d) {
return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
(367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
(3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
}
static void julian_to_date(long jd, int *y, int *m, int *d) {
long L = jd + 68569;
long n = (4 * L) / 146097;
long i, j;
L = L - (146097 * n + 3) / 4;
i = (4000 * (L + 1)) / 1461001;
L = L - (1461 * i) / 4 + 31;
j = (80 * L) / 2447;
*d = L - (2447 * j) / 80;
L = j / 11;
*m = j + 2 - (12 * L);
*y = 100 * (n - 49) + i + L;
}
/* Convert tm structure and offset into julian day and seconds */
static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
long *pday, int *psec) {
int offset_hms, offset_day;
long time_jd;
int time_year, time_month, time_day;
/* split offset into days and day seconds */
offset_day = offset_sec / SECS_PER_DAY;
/* Avoid sign issues with % operator */
offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
offset_day += off_day;
/* Add current time seconds to offset */
offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
/* Adjust day seconds if overflow */
if (offset_hms >= SECS_PER_DAY) {
offset_day++;
offset_hms -= SECS_PER_DAY;
} else if (offset_hms < 0) {
offset_day--;
offset_hms += SECS_PER_DAY;
}
/* Convert date of time structure into a Julian day number. */
time_year = tm->tm_year + 1900;
time_month = tm->tm_mon + 1;
time_day = tm->tm_mday;
time_jd = date_to_julian(time_year, time_month, time_day);
/* Work out Julian day of new date */
time_jd += offset_day;
if (time_jd < 0) {
return 0;
}
*pday = time_jd;
*psec = offset_hms;
return 1;
}
int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec) {
int time_sec, time_year, time_month, time_day;
long time_jd;
/* Convert time and offset into julian day and seconds */
if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec)) {
return 0;
}
/* Convert Julian day back to date */
julian_to_date(time_jd, &time_year, &time_month, &time_day);
if (time_year < 1900 || time_year > 9999) {
return 0;
}
/* Update tm structure */
tm->tm_year = time_year - 1900;
tm->tm_mon = time_month - 1;
tm->tm_mday = time_day;
tm->tm_hour = time_sec / 3600;
tm->tm_min = (time_sec / 60) % 60;
tm->tm_sec = time_sec % 60;
return 1;
}
int OPENSSL_gmtime_diff(int *out_days, int *out_secs, const struct tm *from,
const struct tm *to) {
int from_sec, to_sec, diff_sec;
long from_jd, to_jd, diff_day;
if (!julian_adj(from, 0, 0, &from_jd, &from_sec)) {
return 0;
}
if (!julian_adj(to, 0, 0, &to_jd, &to_sec)) {
return 0;
}
diff_day = to_jd - from_jd;
diff_sec = to_sec - from_sec;
/* Adjust differences so both positive or both negative */
if (diff_day > 0 && diff_sec < 0) {
diff_day--;
diff_sec += SECS_PER_DAY;
}
if (diff_day < 0 && diff_sec > 0) {
diff_day++;
diff_sec -= SECS_PER_DAY;
}
if (out_days) {
*out_days = (int)diff_day;
}
if (out_secs) {
*out_secs = diff_sec;
}
return 1;
}