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- /*
- * The MIT License (MIT)
- *
- * Copyright (c) 2015-2019 Derick Rethans
- * Copyright (c) 2018 MongoDB, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
- #include "timelib.h"
- #include "timelib_private.h"
- #define TIMELIB_SUPPORTS_V2DATA
- #include "timezonedb.h"
- #if (defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__))
- # if defined(__LITTLE_ENDIAN__)
- # undef WORDS_BIGENDIAN
- # else
- # if defined(__BIG_ENDIAN__)
- # define WORDS_BIGENDIAN
- # endif
- # endif
- #endif
- #if defined(__s390__)
- # if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
- # define WORDS_BIGENDIAN
- # else
- # undef WORDS_BIGENDIAN
- # endif
- #endif
- #ifdef WORDS_BIGENDIAN
- static inline uint32_t timelib_conv_int_unsigned(uint32_t value)
- {
- return value;
- }
- static inline uint64_t timelib_conv_int64_unsigned(uint64_t value)
- {
- return value;
- }
- #else
- static inline uint32_t timelib_conv_int_unsigned(uint32_t value)
- {
- return
- ((value & 0x000000ff) << 24) +
- ((value & 0x0000ff00) << 8) +
- ((value & 0x00ff0000) >> 8) +
- ((value & 0xff000000) >> 24);
- }
- static inline uint64_t timelib_conv_int64_unsigned(uint64_t value)
- {
- return
- ((value & 0x00000000000000ff) << 56) +
- ((value & 0x000000000000ff00) << 40) +
- ((value & 0x0000000000ff0000) << 24) +
- ((value & 0x00000000ff000000) << 8) +
- ((value & 0x000000ff00000000) >> 8) +
- ((value & 0x0000ff0000000000) >> 24) +
- ((value & 0x00ff000000000000) >> 40) +
- ((value & 0xff00000000000000) >> 56);
- }
- #endif
- #define timelib_conv_int_signed(value) ((int32_t) timelib_conv_int_unsigned((int32_t) value))
- #define timelib_conv_int64_signed(value) ((int64_t) timelib_conv_int64_unsigned((int64_t) value))
- static int read_php_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- uint32_t version;
- /* read ID */
- version = (*tzf)[3] - '0';
- *tzf += 4;
- /* read BC flag */
- tz->bc = (**tzf == '\1');
- *tzf += 1;
- /* read country code */
- memcpy(tz->location.country_code, *tzf, 2);
- tz->location.country_code[2] = '\0';
- *tzf += 2;
- /* skip rest of preamble */
- *tzf += 13;
- return version;
- }
- static int read_tzif_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- uint32_t version;
- /* read ID */
- switch ((*tzf)[4]) {
- case '\0':
- version = 0;
- break;
- case '2':
- version = 2;
- break;
- case '3':
- version = 3;
- break;
- default:
- return -1;
- }
- *tzf += 5;
- /* set BC flag and country code to default */
- tz->bc = 0;
- tz->location.country_code[0] = '?';
- tz->location.country_code[1] = '?';
- tz->location.country_code[2] = '\0';
- /* skip rest of preamble */
- *tzf += 15;
- return version;
- }
- static int read_preamble(const unsigned char **tzf, timelib_tzinfo *tz, unsigned int *type)
- {
- /* read marker (TZif) or (PHP) */
- if (memcmp(*tzf, "PHP", 3) == 0) {
- *type = TIMELIB_TZINFO_PHP;
- return read_php_preamble(tzf, tz);
- } else if (memcmp(*tzf, "TZif", 4) == 0) {
- *type = TIMELIB_TZINFO_ZONEINFO;
- return read_tzif_preamble(tzf, tz);
- } else {
- return -1;
- }
- }
- static void read_32bit_header(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- uint32_t buffer[6];
- memcpy(&buffer, *tzf, sizeof(buffer));
- tz->_bit32.ttisgmtcnt = timelib_conv_int_unsigned(buffer[0]);
- tz->_bit32.ttisstdcnt = timelib_conv_int_unsigned(buffer[1]);
- tz->_bit32.leapcnt = timelib_conv_int_unsigned(buffer[2]);
- tz->_bit32.timecnt = timelib_conv_int_unsigned(buffer[3]);
- tz->_bit32.typecnt = timelib_conv_int_unsigned(buffer[4]);
- tz->_bit32.charcnt = timelib_conv_int_unsigned(buffer[5]);
- *tzf += sizeof(buffer);
- }
- static int read_64bit_transitions(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- int64_t *buffer = NULL;
- uint32_t i;
- unsigned char *cbuffer = NULL;
- if (tz->bit64.timecnt) {
- buffer = (int64_t*) timelib_malloc(tz->bit64.timecnt * sizeof(int64_t));
- if (!buffer) {
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- memcpy(buffer, *tzf, sizeof(int64_t) * tz->bit64.timecnt);
- *tzf += (sizeof(int64_t) * tz->bit64.timecnt);
- for (i = 0; i < tz->bit64.timecnt; i++) {
- buffer[i] = timelib_conv_int64_signed(buffer[i]);
- /* Sanity check to see whether TS is just increasing */
- if (i > 0 && !(buffer[i] > buffer[i - 1])) {
- return TIMELIB_ERROR_CORRUPT_TRANSITIONS_DONT_INCREASE;
- }
- }
- cbuffer = (unsigned char*) timelib_malloc(tz->bit64.timecnt * sizeof(unsigned char));
- if (!cbuffer) {
- timelib_free(buffer);
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- memcpy(cbuffer, *tzf, sizeof(unsigned char) * tz->bit64.timecnt);
- *tzf += sizeof(unsigned char) * tz->bit64.timecnt;
- }
- tz->trans = buffer;
- tz->trans_idx = cbuffer;
- return 0;
- }
- static void skip_32bit_transitions(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- if (tz->_bit32.timecnt) {
- *tzf += (sizeof(int32_t) * tz->_bit32.timecnt);
- *tzf += sizeof(unsigned char) * tz->_bit32.timecnt;
- }
- }
- static int read_64bit_types(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- unsigned char *buffer;
- int32_t *leap_buffer;
- unsigned int i, j;
- /* Offset Types */
- buffer = (unsigned char*) timelib_malloc(tz->bit64.typecnt * sizeof(unsigned char) * 6);
- if (!buffer) {
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- memcpy(buffer, *tzf, sizeof(unsigned char) * 6 * tz->bit64.typecnt);
- *tzf += sizeof(unsigned char) * 6 * tz->bit64.typecnt;
- tz->type = (ttinfo*) timelib_malloc(tz->bit64.typecnt * sizeof(ttinfo));
- if (!tz->type) {
- timelib_free(buffer);
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- for (i = 0; i < tz->bit64.typecnt; i++) {
- j = i * 6;
- tz->type[i].offset = 0;
- tz->type[i].offset += (int32_t) (((uint32_t) buffer[j]) << 24) + (buffer[j + 1] << 16) + (buffer[j + 2] << 8) + tz->type[i].offset + buffer[j + 3];
- tz->type[i].isdst = buffer[j + 4];
- tz->type[i].abbr_idx = buffer[j + 5];
- }
- timelib_free(buffer);
- /* Abbreviations */
- tz->timezone_abbr = (char*) timelib_malloc(tz->bit64.charcnt);
- if (!tz->timezone_abbr) {
- return TIMELIB_ERROR_CORRUPT_NO_ABBREVIATION;
- }
- memcpy(tz->timezone_abbr, *tzf, sizeof(char) * tz->bit64.charcnt);
- *tzf += sizeof(char) * tz->bit64.charcnt;
- /* Leap seconds (only use in 'right/') format */
- if (tz->bit64.leapcnt) {
- leap_buffer = (int32_t *) timelib_malloc(tz->bit64.leapcnt * (sizeof(int64_t) + sizeof(int32_t)));
- if (!leap_buffer) {
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- memcpy(leap_buffer, *tzf, tz->bit64.leapcnt * (sizeof(int64_t) + sizeof(int32_t)));
- *tzf += tz->bit64.leapcnt * (sizeof(int64_t) + sizeof(int32_t));
- tz->leap_times = (tlinfo*) timelib_malloc(tz->bit64.leapcnt * sizeof(tlinfo));
- if (!tz->leap_times) {
- timelib_free(leap_buffer);
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- for (i = 0; i < tz->bit64.leapcnt; i++) {
- tz->leap_times[i].trans = timelib_conv_int64_signed(leap_buffer[i * 3 + 1] * 4294967296 + leap_buffer[i * 3]);
- tz->leap_times[i].offset = timelib_conv_int_signed(leap_buffer[i * 3 + 2]);
- }
- timelib_free(leap_buffer);
- }
- /* Standard/Wall Indicators (unused) */
- if (tz->bit64.ttisstdcnt) {
- buffer = (unsigned char*) timelib_malloc(tz->bit64.ttisstdcnt * sizeof(unsigned char));
- if (!buffer) {
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- memcpy(buffer, *tzf, sizeof(unsigned char) * tz->bit64.ttisstdcnt);
- *tzf += sizeof(unsigned char) * tz->bit64.ttisstdcnt;
- for (i = 0; i < tz->bit64.ttisstdcnt; i++) {
- tz->type[i].isstdcnt = buffer[i];
- }
- timelib_free(buffer);
- }
- /* UT/Local Time Indicators (unused) */
- if (tz->bit64.ttisgmtcnt) {
- buffer = (unsigned char*) timelib_malloc(tz->bit64.ttisgmtcnt * sizeof(unsigned char));
- if (!buffer) {
- return TIMELIB_ERROR_CANNOT_ALLOCATE;
- }
- memcpy(buffer, *tzf, sizeof(unsigned char) * tz->bit64.ttisgmtcnt);
- *tzf += sizeof(unsigned char) * tz->bit64.ttisgmtcnt;
- for (i = 0; i < tz->bit64.ttisgmtcnt; i++) {
- tz->type[i].isgmtcnt = buffer[i];
- }
- timelib_free(buffer);
- }
- return 0;
- }
- static void skip_32bit_types(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- /* Offset Types */
- *tzf += sizeof(unsigned char) * 6 * tz->_bit32.typecnt;
- /* Abbreviations */
- *tzf += sizeof(char) * tz->_bit32.charcnt;
- /* Leap seconds (only use in 'right/') format */
- if (tz->_bit32.leapcnt) {
- *tzf += sizeof(int32_t) * tz->_bit32.leapcnt * 2;
- }
- /* Standard/Wall Indicators (unused) */
- if (tz->_bit32.ttisstdcnt) {
- *tzf += sizeof(unsigned char) * tz->_bit32.ttisstdcnt;
- }
- /* UT/Local Time Indicators (unused) */
- if (tz->_bit32.ttisgmtcnt) {
- *tzf += sizeof(unsigned char) * tz->_bit32.ttisgmtcnt;
- }
- }
- static void skip_posix_string(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- int n_count = 0;
- do {
- if (*tzf[0] == '\n') {
- n_count++;
- }
- (*tzf)++;
- } while (n_count < 2);
- }
- static void read_location(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- uint32_t buffer[3];
- uint32_t comments_len;
- memcpy(&buffer, *tzf, sizeof(buffer));
- tz->location.latitude = timelib_conv_int_unsigned(buffer[0]);
- tz->location.latitude = (tz->location.latitude / 100000) - 90;
- tz->location.longitude = timelib_conv_int_unsigned(buffer[1]);
- tz->location.longitude = (tz->location.longitude / 100000) - 180;
- comments_len = timelib_conv_int_unsigned(buffer[2]);
- *tzf += sizeof(buffer);
- tz->location.comments = timelib_malloc(comments_len + 1);
- memcpy(tz->location.comments, *tzf, comments_len);
- tz->location.comments[comments_len] = '\0';
- *tzf += comments_len;
- }
- static void set_default_location_and_comments(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- tz->location.latitude = 0;
- tz->location.longitude = 0;
- tz->location.comments = timelib_malloc(2);
- tz->location.comments[0] = '?';
- tz->location.comments[1] = '\0';
- }
- void timelib_dump_tzinfo(timelib_tzinfo *tz)
- {
- uint32_t i;
- printf("Country Code: %s\n", tz->location.country_code);
- printf("Geo Location: %f,%f\n", tz->location.latitude, tz->location.longitude);
- printf("Comments:\n%s\n", tz->location.comments);
- printf("BC: %s\n", tz->bc ? "" : "yes");
- printf("\n64-bit:\n");
- printf("UTC/Local count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.ttisgmtcnt);
- printf("Std/Wall count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.ttisstdcnt);
- printf("Leap.sec. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.leapcnt);
- printf("Trans. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.timecnt);
- printf("Local types count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.typecnt);
- printf("Zone Abbr. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.charcnt);
- printf ("%16s (%20s) = %3d [%5ld %1d %3d '%s' (%d,%d)]\n",
- "", "", 0,
- (long int) tz->type[0].offset,
- tz->type[0].isdst,
- tz->type[0].abbr_idx,
- &tz->timezone_abbr[tz->type[0].abbr_idx],
- tz->type[0].isstdcnt,
- tz->type[0].isgmtcnt
- );
- for (i = 0; i < tz->bit64.timecnt; i++) {
- printf ("%016" PRIX64 " (%20" PRId64 ") = %3d [%5ld %1d %3d '%s' (%d,%d)]\n",
- tz->trans[i], tz->trans[i], tz->trans_idx[i],
- (long int) tz->type[tz->trans_idx[i]].offset,
- tz->type[tz->trans_idx[i]].isdst,
- tz->type[tz->trans_idx[i]].abbr_idx,
- &tz->timezone_abbr[tz->type[tz->trans_idx[i]].abbr_idx],
- tz->type[tz->trans_idx[i]].isstdcnt,
- tz->type[tz->trans_idx[i]].isgmtcnt
- );
- }
- for (i = 0; i < tz->bit64.leapcnt; i++) {
- printf ("%016" PRIX64 " (%20ld) = %d\n",
- tz->leap_times[i].trans,
- (long) tz->leap_times[i].trans,
- tz->leap_times[i].offset);
- }
- }
- static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
- {
- int left = 0, right = tzdb->index_size - 1;
- if (tzdb->index_size == 0) {
- return 0;
- }
- do {
- int mid = ((unsigned)left + right) >> 1;
- int cmp = timelib_strcasecmp(timezone, tzdb->index[mid].id);
- if (cmp < 0) {
- right = mid - 1;
- } else if (cmp > 0) {
- left = mid + 1;
- } else { /* (cmp == 0) */
- (*tzf) = &(tzdb->data[tzdb->index[mid].pos]);
- return 1;
- }
- } while (left <= right);
- return 0;
- }
- const timelib_tzdb *timelib_builtin_db(void)
- {
- return &timezonedb_builtin;
- }
- const timelib_tzdb_index_entry *timelib_timezone_identifiers_list(const timelib_tzdb *tzdb, int *count)
- {
- *count = tzdb->index_size;
- return tzdb->index;
- }
- int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
- {
- const unsigned char *tzf;
- return (seek_to_tz_position(&tzf, timezone, tzdb));
- }
- static int skip_64bit_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- if (memcmp(*tzf, "TZif2", 5) == 0) {
- *tzf += 20;
- return 1;
- } else if (memcmp(*tzf, "TZif3", 5) == 0) {
- *tzf += 20;
- return 1;
- } else {
- return 0;
- }
- }
- static void read_64bit_header(const unsigned char **tzf, timelib_tzinfo *tz)
- {
- uint32_t buffer[6];
- memcpy(&buffer, *tzf, sizeof(buffer));
- tz->bit64.ttisgmtcnt = timelib_conv_int_unsigned(buffer[0]);
- tz->bit64.ttisstdcnt = timelib_conv_int_unsigned(buffer[1]);
- tz->bit64.leapcnt = timelib_conv_int_unsigned(buffer[2]);
- tz->bit64.timecnt = timelib_conv_int_unsigned(buffer[3]);
- tz->bit64.typecnt = timelib_conv_int_unsigned(buffer[4]);
- tz->bit64.charcnt = timelib_conv_int_unsigned(buffer[5]);
- *tzf += sizeof(buffer);
- }
- static timelib_tzinfo* timelib_tzinfo_ctor(char *name)
- {
- timelib_tzinfo *t;
- t = timelib_calloc(1, sizeof(timelib_tzinfo));
- t->name = timelib_strdup(name);
- return t;
- }
- timelib_tzinfo *timelib_parse_tzfile(char *timezone, const timelib_tzdb *tzdb, int *error_code)
- {
- const unsigned char *tzf;
- timelib_tzinfo *tmp;
- int version;
- int transitions_result, types_result;
- unsigned int type; /* TIMELIB_TZINFO_PHP or TIMELIB_TZINFO_ZONEINFO */
- if (seek_to_tz_position(&tzf, timezone, tzdb)) {
- tmp = timelib_tzinfo_ctor(timezone);
- version = read_preamble(&tzf, tmp, &type);
- if (version < 2 || version > 3) {
- *error_code = TIMELIB_ERROR_UNSUPPORTED_VERSION;
- timelib_tzinfo_dtor(tmp);
- return NULL;
- }
- //printf("- timezone: %s, version: %0d\n", timezone, version);
- read_32bit_header(&tzf, tmp);
- skip_32bit_transitions(&tzf, tmp);
- skip_32bit_types(&tzf, tmp);
- if (!skip_64bit_preamble(&tzf, tmp)) {
- /* 64 bit preamble is not in place */
- *error_code = TIMELIB_ERROR_CORRUPT_NO_64BIT_PREAMBLE;
- timelib_tzinfo_dtor(tmp);
- return NULL;
- }
- read_64bit_header(&tzf, tmp);
- if ((transitions_result = read_64bit_transitions(&tzf, tmp)) != 0) {
- /* Corrupt file as transitions do not increase */
- *error_code = transitions_result;
- timelib_tzinfo_dtor(tmp);
- return NULL;
- }
- if ((types_result = read_64bit_types(&tzf, tmp)) != 0) {
- *error_code = types_result;
- timelib_tzinfo_dtor(tmp);
- return NULL;
- }
- skip_posix_string(&tzf, tmp);
- if (type == TIMELIB_TZINFO_PHP) {
- read_location(&tzf, tmp);
- } else {
- set_default_location_and_comments(&tzf, tmp);
- }
- } else {
- *error_code = TIMELIB_ERROR_NO_SUCH_TIMEZONE;
- tmp = NULL;
- }
- return tmp;
- }
- void timelib_tzinfo_dtor(timelib_tzinfo *tz)
- {
- TIMELIB_TIME_FREE(tz->name);
- TIMELIB_TIME_FREE(tz->trans);
- TIMELIB_TIME_FREE(tz->trans_idx);
- TIMELIB_TIME_FREE(tz->type);
- TIMELIB_TIME_FREE(tz->timezone_abbr);
- TIMELIB_TIME_FREE(tz->leap_times);
- TIMELIB_TIME_FREE(tz->location.comments);
- TIMELIB_TIME_FREE(tz);
- tz = NULL;
- }
- timelib_tzinfo *timelib_tzinfo_clone(timelib_tzinfo *tz)
- {
- timelib_tzinfo *tmp = timelib_tzinfo_ctor(tz->name);
- tmp->_bit32.ttisgmtcnt = tz->_bit32.ttisgmtcnt;
- tmp->_bit32.ttisstdcnt = tz->_bit32.ttisstdcnt;
- tmp->_bit32.leapcnt = tz->_bit32.leapcnt;
- tmp->_bit32.timecnt = tz->_bit32.timecnt;
- tmp->_bit32.typecnt = tz->_bit32.typecnt;
- tmp->_bit32.charcnt = tz->_bit32.charcnt;
- tmp->bit64.ttisgmtcnt = tz->bit64.ttisgmtcnt;
- tmp->bit64.ttisstdcnt = tz->bit64.ttisstdcnt;
- tmp->bit64.leapcnt = tz->bit64.leapcnt;
- tmp->bit64.timecnt = tz->bit64.timecnt;
- tmp->bit64.typecnt = tz->bit64.typecnt;
- tmp->bit64.charcnt = tz->bit64.charcnt;
- if (tz->bit64.timecnt) {
- tmp->trans = (int64_t *) timelib_malloc(tz->bit64.timecnt * sizeof(int64_t));
- tmp->trans_idx = (unsigned char*) timelib_malloc(tz->bit64.timecnt * sizeof(unsigned char));
- memcpy(tmp->trans, tz->trans, tz->bit64.timecnt * sizeof(int64_t));
- memcpy(tmp->trans_idx, tz->trans_idx, tz->bit64.timecnt * sizeof(unsigned char));
- }
- tmp->type = (ttinfo*) timelib_malloc(tz->bit64.typecnt * sizeof(ttinfo));
- memcpy(tmp->type, tz->type, tz->bit64.typecnt * sizeof(ttinfo));
- tmp->timezone_abbr = (char*) timelib_malloc(tz->bit64.charcnt);
- memcpy(tmp->timezone_abbr, tz->timezone_abbr, tz->bit64.charcnt);
- if (tz->bit64.leapcnt) {
- tmp->leap_times = (tlinfo*) timelib_malloc(tz->bit64.leapcnt * sizeof(tlinfo));
- memcpy(tmp->leap_times, tz->leap_times, tz->bit64.leapcnt * sizeof(tlinfo));
- }
- return tmp;
- }
- static ttinfo* fetch_timezone_offset(timelib_tzinfo *tz, timelib_sll ts, timelib_sll *transition_time)
- {
- uint32_t i;
- /* If there is no transition time, we pick the first one, if that doesn't
- * exist we return NULL */
- if (!tz->bit64.timecnt || !tz->trans) {
- if (tz->bit64.typecnt == 1) {
- *transition_time = INT64_MIN;
- return &(tz->type[0]);
- }
- return NULL;
- }
- /* If the TS is lower than the first transition time, then we scan over
- * all the transition times to find the first non-DST one, or the first
- * one in case there are only DST entries. Not sure which smartass came up
- * with this idea in the first though :) */
- if (ts < tz->trans[0]) {
- *transition_time = INT64_MIN;
- return &(tz->type[0]);
- }
- /* In all other cases we loop through the available transition times to find
- * the correct entry */
- for (i = 0; i < tz->bit64.timecnt; i++) {
- if (ts < tz->trans[i]) {
- *transition_time = tz->trans[i - 1];
- return &(tz->type[tz->trans_idx[i - 1]]);
- }
- }
- *transition_time = tz->trans[tz->bit64.timecnt - 1];
- return &(tz->type[tz->trans_idx[tz->bit64.timecnt - 1]]);
- }
- static tlinfo* fetch_leaptime_offset(timelib_tzinfo *tz, timelib_sll ts)
- {
- int i;
- if (!tz->bit64.leapcnt || !tz->leap_times) {
- return NULL;
- }
- for (i = tz->bit64.leapcnt - 1; i > 0; i--) {
- if (ts > tz->leap_times[i].trans) {
- return &(tz->leap_times[i]);
- }
- }
- return NULL;
- }
- int timelib_timestamp_is_in_dst(timelib_sll ts, timelib_tzinfo *tz)
- {
- ttinfo *to;
- timelib_sll dummy;
- if ((to = fetch_timezone_offset(tz, ts, &dummy))) {
- return to->isdst;
- }
- return -1;
- }
- timelib_time_offset *timelib_get_time_zone_info(timelib_sll ts, timelib_tzinfo *tz)
- {
- ttinfo *to;
- tlinfo *tl;
- int32_t offset = 0, leap_secs = 0;
- char *abbr;
- timelib_time_offset *tmp = timelib_time_offset_ctor();
- timelib_sll transition_time;
- if ((to = fetch_timezone_offset(tz, ts, &transition_time))) {
- offset = to->offset;
- abbr = &(tz->timezone_abbr[to->abbr_idx]);
- tmp->is_dst = to->isdst;
- tmp->transition_time = transition_time;
- } else {
- offset = 0;
- abbr = tz->timezone_abbr;
- tmp->is_dst = 0;
- tmp->transition_time = 0;
- }
- if ((tl = fetch_leaptime_offset(tz, ts))) {
- leap_secs = -tl->offset;
- }
- tmp->offset = offset;
- tmp->leap_secs = leap_secs;
- tmp->abbr = abbr ? timelib_strdup(abbr) : timelib_strdup("GMT");
- return tmp;
- }
- timelib_sll timelib_get_current_offset(timelib_time *t)
- {
- timelib_time_offset *gmt_offset;
- timelib_sll retval;
- switch (t->zone_type) {
- case TIMELIB_ZONETYPE_ABBR:
- case TIMELIB_ZONETYPE_OFFSET:
- return t->z + (t->dst * 3600);
- case TIMELIB_ZONETYPE_ID:
- gmt_offset = timelib_get_time_zone_info(t->sse, t->tz_info);
- retval = gmt_offset->offset;
- timelib_time_offset_dtor(gmt_offset);
- return retval;
- default:
- return 0;
- }
- }
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