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Annotation of embedaddon/php/ext/fileinfo/libmagic/cdf_time.c, revision 1.1.1.1

1.1       misho       1: /*-
                      2:  * Copyright (c) 2008 Christos Zoulas
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     15:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     16:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     17:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     18:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     19:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     20:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     21:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     22:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     23:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     24:  * POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26: 
                     27: #include "file.h"
                     28: 
                     29: #ifndef lint
                     30: FILE_RCSID("@(#)$File: cdf_time.c,v 1.6 2009/03/10 11:44:29 christos Exp $")
                     31: #endif
                     32: 
                     33: #include <time.h>
                     34: #ifdef TEST
                     35: #include <err.h>
                     36: #endif
                     37: #include <string.h>
                     38: 
                     39: #include "cdf.h"
                     40: 
                     41: #define isleap(y) ((((y) % 4) == 0) && \
                     42:     ((((y) % 100) != 0) || (((y) % 400) == 0)))
                     43: 
                     44: static const int mdays[] = {
                     45:     31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
                     46: };
                     47: 
                     48: /*
                     49:  * Return the number of days between jan 01 1601 and jan 01 of year.
                     50:  */
                     51: static int
                     52: cdf_getdays(int year)
                     53: {
                     54:        int days = 0;
                     55:        int y;
                     56: 
                     57:        for (y = CDF_BASE_YEAR; y < year; y++)
                     58:                days += isleap(y) + 365;
                     59:                
                     60:        return days;
                     61: }
                     62: 
                     63: /*
                     64:  * Return the day within the month
                     65:  */
                     66: static int
                     67: cdf_getday(int year, int days)
                     68: {
                     69:        size_t m;
                     70: 
                     71:        for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
                     72:                int sub = mdays[m] + (m == 1 && isleap(year));
                     73:                if (days < sub)
                     74:                        return days;
                     75:                days -= sub;
                     76:        }
                     77:        return days;
                     78: }
                     79: 
                     80: /* 
                     81:  * Return the 0...11 month number.
                     82:  */
                     83: static int
                     84: cdf_getmonth(int year, int days)
                     85: {
                     86:        size_t m;
                     87: 
                     88:        for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
                     89:                days -= mdays[m];
                     90:                if (m == 1 && isleap(year))
                     91:                        days--;
                     92:                if (days <= 0)
                     93:                        return (int)m;
                     94:        }
                     95:        return (int)m;
                     96: }
                     97: 
                     98: int
                     99: cdf_timestamp_to_timespec(struct timeval *ts, cdf_timestamp_t t)
                    100: {
                    101:        struct tm tm;
                    102: #ifdef HAVE_STRUCT_TM_TM_ZONE
                    103:        static char UTC[] = "UTC";
                    104: #endif
                    105:        int rdays;
                    106: 
                    107:        /* Time interval, in microseconds */
                    108:        ts->tv_usec = (t % CDF_TIME_PREC) * CDF_TIME_PREC;
                    109: 
                    110:        t /= CDF_TIME_PREC;
                    111:        tm.tm_sec = t % 60;
                    112:        t /= 60;
                    113: 
                    114:        tm.tm_min = t % 60;
                    115:        t /= 60;
                    116: 
                    117:        tm.tm_hour = t % 24;
                    118:        t /= 24;
                    119: 
                    120:        /* XXX: Approx */
                    121:        tm.tm_year = CDF_BASE_YEAR + (t / 365);
                    122: 
                    123:        rdays = cdf_getdays(tm.tm_year);
                    124:        t -= rdays;
                    125:        tm.tm_mday = cdf_getday(tm.tm_year, t);
                    126:        tm.tm_mon = cdf_getmonth(tm.tm_year, t);
                    127:        tm.tm_wday = 0;
                    128:        tm.tm_yday = 0;
                    129:        tm.tm_isdst = 0;
                    130: #ifdef HAVE_STRUCT_TM_TM_GMTOFF
                    131:        tm.tm_gmtoff = 0;
                    132: #endif
                    133: #ifdef HAVE_STRUCT_TM_TM_ZONE
                    134:        tm.tm_zone = UTC;
                    135: #endif
                    136:        tm.tm_year -= 1900;
                    137:        ts->tv_sec = mktime(&tm);
                    138:        if (ts->tv_sec == -1) {
                    139:                errno = EINVAL;
                    140:                return -1;
                    141:        }
                    142:        return 0;
                    143: }
                    144: 
                    145: int
                    146: cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timeval *ts)
                    147: {
                    148:        (void)&t;
                    149:        (void)&ts;
                    150: #ifdef notyet
                    151:        struct tm tm;
                    152:        if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
                    153:                errno = EINVAL;
                    154:                return -1;
                    155:        }
                    156:        *t = (ts->ts_usec / CDF_TIME_PREC) * CDF_TIME_PREC;
                    157:        *t = tm.tm_sec;
                    158:        *t += tm.tm_min * 60;
                    159:        *t += tm.tm_hour * 60 * 60;
                    160:        *t += tm.tm_mday * 60 * 60 * 24;
                    161: #endif
                    162:        return 0;
                    163: }
                    164: 
                    165: 
                    166: #ifdef TEST
                    167: int
                    168: main(int argc, char *argv[])
                    169: {
                    170:        struct timeval ts;
                    171:        static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
                    172:        static const char *ref = "Sat Apr 23 01:30:00 1977";
                    173:        char *p, *q;
                    174: 
                    175:        cdf_timestamp_to_timespec(&ts, tst);
                    176:        p = ctime(&ts.tv_sec);
                    177:        if ((q = strchr(p, '\n')) != NULL)
                    178:                *q = '\0';
                    179:        if (strcmp(ref, p) != 0)
                    180:                errx(1, "Error date %s != %s\n", ref, p);
                    181:        return 0;
                    182: }
                    183: #endif