/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- read_preamble
- read_header
- read_transistions
- read_types
- read_location
- timelib_dump_tzinfo
- seek_to_tz_position
- timelib_builtin_db
- timelib_timezone_builtin_identifiers_list
- timelib_timezone_id_is_valid
- timelib_parse_tzfile
- fetch_timezone_offset
- fetch_leaptime_offset
- timelib_timestamp_is_in_dst
- timelib_get_time_zone_info
- timelib_get_current_offset
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2013 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Derick Rethans <derick@derickrethans.nl> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "timelib.h"
#include <stdio.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#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
#ifdef WORDS_BIGENDIAN
#define timelib_conv_int(l) (l)
#else
#define timelib_conv_int(l) ((l & 0x000000ff) << 24) + ((l & 0x0000ff00) << 8) + ((l & 0x00ff0000) >> 8) + ((l & 0xff000000) >> 24)
#endif
static void read_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
{
/* skip ID */
*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 read of preamble */
*tzf += 13;
}
static void read_header(const unsigned char **tzf, timelib_tzinfo *tz)
{
uint32_t buffer[6];
memcpy(&buffer, *tzf, sizeof(buffer));
tz->ttisgmtcnt = timelib_conv_int(buffer[0]);
tz->ttisstdcnt = timelib_conv_int(buffer[1]);
tz->leapcnt = timelib_conv_int(buffer[2]);
tz->timecnt = timelib_conv_int(buffer[3]);
tz->typecnt = timelib_conv_int(buffer[4]);
tz->charcnt = timelib_conv_int(buffer[5]);
*tzf += sizeof(buffer);
}
static void read_transistions(const unsigned char **tzf, timelib_tzinfo *tz)
{
int32_t *buffer = NULL;
uint32_t i;
unsigned char *cbuffer = NULL;
if (tz->timecnt) {
buffer = (int32_t*) malloc(tz->timecnt * sizeof(int32_t));
if (!buffer) {
return;
}
memcpy(buffer, *tzf, sizeof(int32_t) * tz->timecnt);
*tzf += (sizeof(int32_t) * tz->timecnt);
for (i = 0; i < tz->timecnt; i++) {
buffer[i] = timelib_conv_int(buffer[i]);
}
cbuffer = (unsigned char*) malloc(tz->timecnt * sizeof(unsigned char));
if (!cbuffer) {
free(buffer);
return;
}
memcpy(cbuffer, *tzf, sizeof(unsigned char) * tz->timecnt);
*tzf += sizeof(unsigned char) * tz->timecnt;
}
tz->trans = buffer;
tz->trans_idx = cbuffer;
}
static void read_types(const unsigned char **tzf, timelib_tzinfo *tz)
{
unsigned char *buffer;
int32_t *leap_buffer;
unsigned int i, j;
buffer = (unsigned char*) malloc(tz->typecnt * sizeof(unsigned char) * 6);
if (!buffer) {
return;
}
memcpy(buffer, *tzf, sizeof(unsigned char) * 6 * tz->typecnt);
*tzf += sizeof(unsigned char) * 6 * tz->typecnt;
tz->type = (ttinfo*) malloc(tz->typecnt * sizeof(struct ttinfo));
if (!tz->type) {
free(buffer);
return;
}
for (i = 0; i < tz->typecnt; i++) {
j = i * 6;
tz->type[i].offset = (buffer[j] * 16777216) + (buffer[j + 1] * 65536) + (buffer[j + 2] * 256) + buffer[j + 3];
tz->type[i].isdst = buffer[j + 4];
tz->type[i].abbr_idx = buffer[j + 5];
}
free(buffer);
tz->timezone_abbr = (char*) malloc(tz->charcnt);
if (!tz->timezone_abbr) {
return;
}
memcpy(tz->timezone_abbr, *tzf, sizeof(char) * tz->charcnt);
*tzf += sizeof(char) * tz->charcnt;
if (tz->leapcnt) {
leap_buffer = (int32_t *) malloc(tz->leapcnt * 2 * sizeof(int32_t));
if (!leap_buffer) {
return;
}
memcpy(leap_buffer, *tzf, sizeof(int32_t) * tz->leapcnt * 2);
*tzf += sizeof(int32_t) * tz->leapcnt * 2;
tz->leap_times = (tlinfo*) malloc(tz->leapcnt * sizeof(tlinfo));
if (!tz->leap_times) {
free(leap_buffer);
return;
}
for (i = 0; i < tz->leapcnt; i++) {
tz->leap_times[i].trans = timelib_conv_int(leap_buffer[i * 2]);
tz->leap_times[i].offset = timelib_conv_int(leap_buffer[i * 2 + 1]);
}
free(leap_buffer);
}
if (tz->ttisstdcnt) {
buffer = (unsigned char*) malloc(tz->ttisstdcnt * sizeof(unsigned char));
if (!buffer) {
return;
}
memcpy(buffer, *tzf, sizeof(unsigned char) * tz->ttisstdcnt);
*tzf += sizeof(unsigned char) * tz->ttisstdcnt;
for (i = 0; i < tz->ttisstdcnt; i++) {
tz->type[i].isstdcnt = buffer[i];
}
free(buffer);
}
if (tz->ttisgmtcnt) {
buffer = (unsigned char*) malloc(tz->ttisgmtcnt * sizeof(unsigned char));
if (!buffer) {
return;
}
memcpy(buffer, *tzf, sizeof(unsigned char) * tz->ttisgmtcnt);
*tzf += sizeof(unsigned char) * tz->ttisgmtcnt;
for (i = 0; i < tz->ttisgmtcnt; i++) {
tz->type[i].isgmtcnt = buffer[i];
}
free(buffer);
}
}
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(buffer[0]);
tz->location.latitude = (tz->location.latitude / 100000) - 90;
tz->location.longitude = timelib_conv_int(buffer[1]);
tz->location.longitude = (tz->location.longitude / 100000) - 180;
comments_len = timelib_conv_int(buffer[2]);
*tzf += sizeof(buffer);
tz->location.comments = malloc(comments_len + 1);
memcpy(tz->location.comments, *tzf, comments_len);
tz->location.comments[comments_len] = '\0';
*tzf += comments_len;
}
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("UTC/Local count: %lu\n", (unsigned long) tz->ttisgmtcnt);
printf("Std/Wall count: %lu\n", (unsigned long) tz->ttisstdcnt);
printf("Leap.sec. count: %lu\n", (unsigned long) tz->leapcnt);
printf("Trans. count: %lu\n", (unsigned long) tz->timecnt);
printf("Local types count: %lu\n", (unsigned long) tz->typecnt);
printf("Zone Abbr. count: %lu\n", (unsigned long) tz->charcnt);
printf ("%8s (%12s) = %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->timecnt; i++) {
printf ("%08X (%12d) = %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->leapcnt; i++) {
printf ("%08X (%12ld) = %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;
#ifdef HAVE_SETLOCALE
char *cur_locale = NULL, *tmp;
tmp = setlocale(LC_CTYPE, NULL);
if (tmp) {
cur_locale = strdup(tmp);
}
setlocale(LC_CTYPE, "C");
#endif
do {
int mid = ((unsigned)left + right) >> 1;
int cmp = 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]);
#ifdef HAVE_SETLOCALE
setlocale(LC_CTYPE, cur_locale);
if (cur_locale) free(cur_locale);
#endif
return 1;
}
} while (left <= right);
#ifdef HAVE_SETLOCALE
setlocale(LC_CTYPE, cur_locale);
if (cur_locale) free(cur_locale);
#endif
return 0;
}
const timelib_tzdb *timelib_builtin_db(void)
{
return &timezonedb_builtin;
}
const timelib_tzdb_index_entry *timelib_timezone_builtin_identifiers_list(int *count)
{
*count = sizeof(timezonedb_idx_builtin) / sizeof(*timezonedb_idx_builtin);
return timezonedb_idx_builtin;
}
int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
{
const unsigned char *tzf;
return (seek_to_tz_position(&tzf, timezone, tzdb));
}
timelib_tzinfo *timelib_parse_tzfile(char *timezone, const timelib_tzdb *tzdb)
{
const unsigned char *tzf;
timelib_tzinfo *tmp;
if (seek_to_tz_position(&tzf, timezone, tzdb)) {
tmp = timelib_tzinfo_ctor(timezone);
read_preamble(&tzf, tmp);
read_header(&tzf, tmp);
read_transistions(&tzf, tmp);
read_types(&tzf, tmp);
read_location(&tzf, tmp);
} else {
tmp = NULL;
}
return tmp;
}
static ttinfo* fetch_timezone_offset(timelib_tzinfo *tz, timelib_sll ts, timelib_sll *transition_time)
{
uint32_t i;
/* If there is no transistion time, we pick the first one, if that doesn't
* exist we return NULL */
if (!tz->timecnt || !tz->trans) {
*transition_time = 0;
if (tz->typecnt == 1) {
return &(tz->type[0]);
}
return NULL;
}
/* If the TS is lower than the first transistion time, then we scan over
* all the transistion 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]) {
uint32_t j;
*transition_time = 0;
j = 0;
while (j < tz->timecnt && tz->type[j].isdst) {
++j;
}
if (j == tz->timecnt) {
j = 0;
}
return &(tz->type[j]);
}
/* In all other cases we loop through the available transtion times to find
* the correct entry */
for (i = 0; i < tz->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->timecnt - 1];
return &(tz->type[tz->trans_idx[tz->timecnt - 1]]);
}
static tlinfo* fetch_leaptime_offset(timelib_tzinfo *tz, timelib_sll ts)
{
int i;
if (!tz->leapcnt || !tz->leap_times) {
return NULL;
}
for (i = tz->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 transistion_time;
if ((to = fetch_timezone_offset(tz, ts, &transistion_time))) {
offset = to->offset;
abbr = &(tz->timezone_abbr[to->abbr_idx]);
tmp->is_dst = to->isdst;
tmp->transistion_time = transistion_time;
} else {
offset = 0;
abbr = tz->timezone_abbr;
tmp->is_dst = 0;
tmp->transistion_time = 0;
}
if ((tl = fetch_leaptime_offset(tz, ts))) {
leap_secs = -tl->offset;
}
tmp->offset = offset;
tmp->leap_secs = leap_secs;
tmp->abbr = abbr ? strdup(abbr) : 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) * -60;
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;
}
}