diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/o_time.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/o_time.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/o_time.c b/openssl-1.1.0h/crypto/o_time.c new file mode 100644 index 0000000..b2fb38a --- /dev/null +++ b/openssl-1.1.0h/crypto/o_time.c @@ -0,0 +1,196 @@ +/* + * Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <openssl/e_os2.h> +#include <string.h> +#include <openssl/crypto.h> + +struct tm *OPENSSL_gmtime(const time_t *timer, struct tm *result) +{ + struct tm *ts = NULL; + +#if defined(OPENSSL_THREADS) && defined(OPENSSL_SYS_VMS) + { + /* + * On VMS, gmtime_r() takes a 32-bit pointer as second argument. + * Since we can't know that |result| is in a space that can easily + * translate to a 32-bit pointer, we must store temporarily on stack + * and copy the result. The stack is always reachable with 32-bit + * pointers. + */ +#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE +# pragma pointer_size save +# pragma pointer_size 32 +#endif + struct tm data, *ts2 = &data; +#if defined OPENSSL_SYS_VMS && __INITIAL_POINTER_SIZE +# pragma pointer_size restore +#endif + if (gmtime_r(timer, ts2) == NULL) + return NULL; + memcpy(result, ts2, sizeof(struct tm)); + ts = result; + } +#elif defined(OPENSSL_THREADS) && !defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_SYS_MACOSX) + if (gmtime_r(timer, result) == NULL) + return NULL; + ts = result; +#else + ts = gmtime(timer); + if (ts == NULL) + return NULL; + + memcpy(result, ts, sizeof(struct tm)); + ts = result; +#endif + return ts; +} + +/* + * Take a tm structure and add an offset to it. This avoids any OS issues + * with restricted date types and overflows which cause the year 2038 + * problem. + */ + +#define SECS_PER_DAY (24 * 60 * 60) + +static long date_to_julian(int y, int m, int d); +static void julian_to_date(long jd, int *y, int *m, int *d); +static int julian_adj(const struct tm *tm, int off_day, long offset_sec, + long *pday, int *psec); + +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; + +} + +/* 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; +} + +/* + * 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; +} |