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- /* 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
-
- #if defined(__MINGW32__)
- #define MINGW_HAS_SECURE_API 1 /* supplied by libmingwex */
- #include <sec_api/time_s.h> /* for correct definition of gmtime_s */
- #undef MINGW_HAS_SECURE_API
- #endif
-
- #include <openssl/time_support.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 *pday, int *psec, 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 (pday) {
- *pday = (int)diff_day;
- }
- if (psec) {
- *psec = diff_sec;
- }
-
- return 1;
- }
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