1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2013 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Derick Rethans <derick@derickrethans.nl> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 #include "timelib.h"
22
23 #include <stdio.h>
24
25 #ifdef HAVE_LOCALE_H
26 #include <locale.h>
27 #endif
28
29 #ifdef HAVE_STRING_H
30 #include <string.h>
31 #else
32 #include <strings.h>
33 #endif
34 #include "timezonedb.h"
35
36 #if (defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__))
37 # if defined(__LITTLE_ENDIAN__)
38 # undef WORDS_BIGENDIAN
39 # else
40 # if defined(__BIG_ENDIAN__)
41 # define WORDS_BIGENDIAN
42 # endif
43 # endif
44 #endif
45
46 #ifdef WORDS_BIGENDIAN
47 #define timelib_conv_int(l) (l)
48 #else
49 #define timelib_conv_int(l) ((l & 0x000000ff) << 24) + ((l & 0x0000ff00) << 8) + ((l & 0x00ff0000) >> 8) + ((l & 0xff000000) >> 24)
50 #endif
51
read_preamble(const unsigned char ** tzf,timelib_tzinfo * tz)52 static void read_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
53 {
54 /* skip ID */
55 *tzf += 4;
56
57 /* read BC flag */
58 tz->bc = (**tzf == '\1');
59 *tzf += 1;
60
61 /* read country code */
62 memcpy(tz->location.country_code, *tzf, 2);
63 tz->location.country_code[2] = '\0';
64 *tzf += 2;
65
66 /* skip read of preamble */
67 *tzf += 13;
68 }
69
read_header(const unsigned char ** tzf,timelib_tzinfo * tz)70 static void read_header(const unsigned char **tzf, timelib_tzinfo *tz)
71 {
72 uint32_t buffer[6];
73
74 memcpy(&buffer, *tzf, sizeof(buffer));
75 tz->ttisgmtcnt = timelib_conv_int(buffer[0]);
76 tz->ttisstdcnt = timelib_conv_int(buffer[1]);
77 tz->leapcnt = timelib_conv_int(buffer[2]);
78 tz->timecnt = timelib_conv_int(buffer[3]);
79 tz->typecnt = timelib_conv_int(buffer[4]);
80 tz->charcnt = timelib_conv_int(buffer[5]);
81 *tzf += sizeof(buffer);
82 }
83
read_transistions(const unsigned char ** tzf,timelib_tzinfo * tz)84 static void read_transistions(const unsigned char **tzf, timelib_tzinfo *tz)
85 {
86 int32_t *buffer = NULL;
87 uint32_t i;
88 unsigned char *cbuffer = NULL;
89
90 if (tz->timecnt) {
91 buffer = (int32_t*) malloc(tz->timecnt * sizeof(int32_t));
92 if (!buffer) {
93 return;
94 }
95 memcpy(buffer, *tzf, sizeof(int32_t) * tz->timecnt);
96 *tzf += (sizeof(int32_t) * tz->timecnt);
97 for (i = 0; i < tz->timecnt; i++) {
98 buffer[i] = timelib_conv_int(buffer[i]);
99 }
100
101 cbuffer = (unsigned char*) malloc(tz->timecnt * sizeof(unsigned char));
102 if (!cbuffer) {
103 free(buffer);
104 return;
105 }
106 memcpy(cbuffer, *tzf, sizeof(unsigned char) * tz->timecnt);
107 *tzf += sizeof(unsigned char) * tz->timecnt;
108 }
109
110 tz->trans = buffer;
111 tz->trans_idx = cbuffer;
112 }
113
read_types(const unsigned char ** tzf,timelib_tzinfo * tz)114 static void read_types(const unsigned char **tzf, timelib_tzinfo *tz)
115 {
116 unsigned char *buffer;
117 int32_t *leap_buffer;
118 unsigned int i, j;
119
120 buffer = (unsigned char*) malloc(tz->typecnt * sizeof(unsigned char) * 6);
121 if (!buffer) {
122 return;
123 }
124 memcpy(buffer, *tzf, sizeof(unsigned char) * 6 * tz->typecnt);
125 *tzf += sizeof(unsigned char) * 6 * tz->typecnt;
126
127 tz->type = (ttinfo*) malloc(tz->typecnt * sizeof(struct ttinfo));
128 if (!tz->type) {
129 free(buffer);
130 return;
131 }
132
133 for (i = 0; i < tz->typecnt; i++) {
134 j = i * 6;
135 tz->type[i].offset = (buffer[j] * 16777216) + (buffer[j + 1] * 65536) + (buffer[j + 2] * 256) + buffer[j + 3];
136 tz->type[i].isdst = buffer[j + 4];
137 tz->type[i].abbr_idx = buffer[j + 5];
138 }
139 free(buffer);
140
141 tz->timezone_abbr = (char*) malloc(tz->charcnt);
142 if (!tz->timezone_abbr) {
143 return;
144 }
145 memcpy(tz->timezone_abbr, *tzf, sizeof(char) * tz->charcnt);
146 *tzf += sizeof(char) * tz->charcnt;
147
148 if (tz->leapcnt) {
149 leap_buffer = (int32_t *) malloc(tz->leapcnt * 2 * sizeof(int32_t));
150 if (!leap_buffer) {
151 return;
152 }
153 memcpy(leap_buffer, *tzf, sizeof(int32_t) * tz->leapcnt * 2);
154 *tzf += sizeof(int32_t) * tz->leapcnt * 2;
155
156 tz->leap_times = (tlinfo*) malloc(tz->leapcnt * sizeof(tlinfo));
157 if (!tz->leap_times) {
158 free(leap_buffer);
159 return;
160 }
161 for (i = 0; i < tz->leapcnt; i++) {
162 tz->leap_times[i].trans = timelib_conv_int(leap_buffer[i * 2]);
163 tz->leap_times[i].offset = timelib_conv_int(leap_buffer[i * 2 + 1]);
164 }
165 free(leap_buffer);
166 }
167
168 if (tz->ttisstdcnt) {
169 buffer = (unsigned char*) malloc(tz->ttisstdcnt * sizeof(unsigned char));
170 if (!buffer) {
171 return;
172 }
173 memcpy(buffer, *tzf, sizeof(unsigned char) * tz->ttisstdcnt);
174 *tzf += sizeof(unsigned char) * tz->ttisstdcnt;
175
176 for (i = 0; i < tz->ttisstdcnt; i++) {
177 tz->type[i].isstdcnt = buffer[i];
178 }
179 free(buffer);
180 }
181
182 if (tz->ttisgmtcnt) {
183 buffer = (unsigned char*) malloc(tz->ttisgmtcnt * sizeof(unsigned char));
184 if (!buffer) {
185 return;
186 }
187 memcpy(buffer, *tzf, sizeof(unsigned char) * tz->ttisgmtcnt);
188 *tzf += sizeof(unsigned char) * tz->ttisgmtcnt;
189
190 for (i = 0; i < tz->ttisgmtcnt; i++) {
191 tz->type[i].isgmtcnt = buffer[i];
192 }
193 free(buffer);
194 }
195 }
196
read_location(const unsigned char ** tzf,timelib_tzinfo * tz)197 static void read_location(const unsigned char **tzf, timelib_tzinfo *tz)
198 {
199 uint32_t buffer[3];
200 uint32_t comments_len;
201
202 memcpy(&buffer, *tzf, sizeof(buffer));
203 tz->location.latitude = timelib_conv_int(buffer[0]);
204 tz->location.latitude = (tz->location.latitude / 100000) - 90;
205 tz->location.longitude = timelib_conv_int(buffer[1]);
206 tz->location.longitude = (tz->location.longitude / 100000) - 180;
207 comments_len = timelib_conv_int(buffer[2]);
208 *tzf += sizeof(buffer);
209
210 tz->location.comments = malloc(comments_len + 1);
211 memcpy(tz->location.comments, *tzf, comments_len);
212 tz->location.comments[comments_len] = '\0';
213 *tzf += comments_len;
214 }
215
timelib_dump_tzinfo(timelib_tzinfo * tz)216 void timelib_dump_tzinfo(timelib_tzinfo *tz)
217 {
218 uint32_t i;
219
220 printf("Country Code: %s\n", tz->location.country_code);
221 printf("Geo Location: %f,%f\n", tz->location.latitude, tz->location.longitude);
222 printf("Comments:\n%s\n", tz->location.comments);
223 printf("BC: %s\n", tz->bc ? "" : "yes");
224 printf("UTC/Local count: %lu\n", (unsigned long) tz->ttisgmtcnt);
225 printf("Std/Wall count: %lu\n", (unsigned long) tz->ttisstdcnt);
226 printf("Leap.sec. count: %lu\n", (unsigned long) tz->leapcnt);
227 printf("Trans. count: %lu\n", (unsigned long) tz->timecnt);
228 printf("Local types count: %lu\n", (unsigned long) tz->typecnt);
229 printf("Zone Abbr. count: %lu\n", (unsigned long) tz->charcnt);
230
231 printf ("%8s (%12s) = %3d [%5ld %1d %3d '%s' (%d,%d)]\n",
232 "", "", 0,
233 (long int) tz->type[0].offset,
234 tz->type[0].isdst,
235 tz->type[0].abbr_idx,
236 &tz->timezone_abbr[tz->type[0].abbr_idx],
237 tz->type[0].isstdcnt,
238 tz->type[0].isgmtcnt
239 );
240 for (i = 0; i < tz->timecnt; i++) {
241 printf ("%08X (%12d) = %3d [%5ld %1d %3d '%s' (%d,%d)]\n",
242 tz->trans[i], tz->trans[i], tz->trans_idx[i],
243 (long int) tz->type[tz->trans_idx[i]].offset,
244 tz->type[tz->trans_idx[i]].isdst,
245 tz->type[tz->trans_idx[i]].abbr_idx,
246 &tz->timezone_abbr[tz->type[tz->trans_idx[i]].abbr_idx],
247 tz->type[tz->trans_idx[i]].isstdcnt,
248 tz->type[tz->trans_idx[i]].isgmtcnt
249 );
250 }
251 for (i = 0; i < tz->leapcnt; i++) {
252 printf ("%08X (%12ld) = %d\n",
253 tz->leap_times[i].trans,
254 (long) tz->leap_times[i].trans,
255 tz->leap_times[i].offset);
256 }
257 }
258
seek_to_tz_position(const unsigned char ** tzf,char * timezone,const timelib_tzdb * tzdb)259 static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
260 {
261 int left = 0, right = tzdb->index_size - 1;
262 #ifdef HAVE_SETLOCALE
263 char *cur_locale = NULL, *tmp;
264
265 tmp = setlocale(LC_CTYPE, NULL);
266 if (tmp) {
267 cur_locale = strdup(tmp);
268 }
269 setlocale(LC_CTYPE, "C");
270 #endif
271
272 do {
273 int mid = ((unsigned)left + right) >> 1;
274 int cmp = strcasecmp(timezone, tzdb->index[mid].id);
275
276 if (cmp < 0) {
277 right = mid - 1;
278 } else if (cmp > 0) {
279 left = mid + 1;
280 } else { /* (cmp == 0) */
281 (*tzf) = &(tzdb->data[tzdb->index[mid].pos]);
282 #ifdef HAVE_SETLOCALE
283 setlocale(LC_CTYPE, cur_locale);
284 if (cur_locale) free(cur_locale);
285 #endif
286 return 1;
287 }
288
289 } while (left <= right);
290
291 #ifdef HAVE_SETLOCALE
292 setlocale(LC_CTYPE, cur_locale);
293 if (cur_locale) free(cur_locale);
294 #endif
295 return 0;
296 }
297
timelib_builtin_db(void)298 const timelib_tzdb *timelib_builtin_db(void)
299 {
300 return &timezonedb_builtin;
301 }
302
timelib_timezone_builtin_identifiers_list(int * count)303 const timelib_tzdb_index_entry *timelib_timezone_builtin_identifiers_list(int *count)
304 {
305 *count = sizeof(timezonedb_idx_builtin) / sizeof(*timezonedb_idx_builtin);
306 return timezonedb_idx_builtin;
307 }
308
timelib_timezone_id_is_valid(char * timezone,const timelib_tzdb * tzdb)309 int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
310 {
311 const unsigned char *tzf;
312 return (seek_to_tz_position(&tzf, timezone, tzdb));
313 }
314
timelib_parse_tzfile(char * timezone,const timelib_tzdb * tzdb)315 timelib_tzinfo *timelib_parse_tzfile(char *timezone, const timelib_tzdb *tzdb)
316 {
317 const unsigned char *tzf;
318 timelib_tzinfo *tmp;
319
320 if (seek_to_tz_position(&tzf, timezone, tzdb)) {
321 tmp = timelib_tzinfo_ctor(timezone);
322
323 read_preamble(&tzf, tmp);
324 read_header(&tzf, tmp);
325 read_transistions(&tzf, tmp);
326 read_types(&tzf, tmp);
327 read_location(&tzf, tmp);
328 } else {
329 tmp = NULL;
330 }
331
332 return tmp;
333 }
334
fetch_timezone_offset(timelib_tzinfo * tz,timelib_sll ts,timelib_sll * transition_time)335 static ttinfo* fetch_timezone_offset(timelib_tzinfo *tz, timelib_sll ts, timelib_sll *transition_time)
336 {
337 uint32_t i;
338
339 /* If there is no transistion time, we pick the first one, if that doesn't
340 * exist we return NULL */
341 if (!tz->timecnt || !tz->trans) {
342 *transition_time = 0;
343 if (tz->typecnt == 1) {
344 return &(tz->type[0]);
345 }
346 return NULL;
347 }
348
349 /* If the TS is lower than the first transistion time, then we scan over
350 * all the transistion times to find the first non-DST one, or the first
351 * one in case there are only DST entries. Not sure which smartass came up
352 * with this idea in the first though :) */
353 if (ts < tz->trans[0]) {
354 uint32_t j;
355
356 *transition_time = 0;
357 j = 0;
358 while (j < tz->timecnt && tz->type[j].isdst) {
359 ++j;
360 }
361 if (j == tz->timecnt) {
362 j = 0;
363 }
364 return &(tz->type[j]);
365 }
366
367 /* In all other cases we loop through the available transtion times to find
368 * the correct entry */
369 for (i = 0; i < tz->timecnt; i++) {
370 if (ts < tz->trans[i]) {
371 *transition_time = tz->trans[i - 1];
372 return &(tz->type[tz->trans_idx[i - 1]]);
373 }
374 }
375 *transition_time = tz->trans[tz->timecnt - 1];
376 return &(tz->type[tz->trans_idx[tz->timecnt - 1]]);
377 }
378
fetch_leaptime_offset(timelib_tzinfo * tz,timelib_sll ts)379 static tlinfo* fetch_leaptime_offset(timelib_tzinfo *tz, timelib_sll ts)
380 {
381 int i;
382
383 if (!tz->leapcnt || !tz->leap_times) {
384 return NULL;
385 }
386
387 for (i = tz->leapcnt - 1; i > 0; i--) {
388 if (ts > tz->leap_times[i].trans) {
389 return &(tz->leap_times[i]);
390 }
391 }
392 return NULL;
393 }
394
timelib_timestamp_is_in_dst(timelib_sll ts,timelib_tzinfo * tz)395 int timelib_timestamp_is_in_dst(timelib_sll ts, timelib_tzinfo *tz)
396 {
397 ttinfo *to;
398 timelib_sll dummy;
399
400 if ((to = fetch_timezone_offset(tz, ts, &dummy))) {
401 return to->isdst;
402 }
403 return -1;
404 }
405
timelib_get_time_zone_info(timelib_sll ts,timelib_tzinfo * tz)406 timelib_time_offset *timelib_get_time_zone_info(timelib_sll ts, timelib_tzinfo *tz)
407 {
408 ttinfo *to;
409 tlinfo *tl;
410 int32_t offset = 0, leap_secs = 0;
411 char *abbr;
412 timelib_time_offset *tmp = timelib_time_offset_ctor();
413 timelib_sll transistion_time;
414
415 if ((to = fetch_timezone_offset(tz, ts, &transistion_time))) {
416 offset = to->offset;
417 abbr = &(tz->timezone_abbr[to->abbr_idx]);
418 tmp->is_dst = to->isdst;
419 tmp->transistion_time = transistion_time;
420 } else {
421 offset = 0;
422 abbr = tz->timezone_abbr;
423 tmp->is_dst = 0;
424 tmp->transistion_time = 0;
425 }
426
427 if ((tl = fetch_leaptime_offset(tz, ts))) {
428 leap_secs = -tl->offset;
429 }
430
431 tmp->offset = offset;
432 tmp->leap_secs = leap_secs;
433 tmp->abbr = abbr ? strdup(abbr) : strdup("GMT");
434
435 return tmp;
436 }
437
timelib_get_current_offset(timelib_time * t)438 timelib_sll timelib_get_current_offset(timelib_time *t)
439 {
440 timelib_time_offset *gmt_offset;
441 timelib_sll retval;
442
443 switch (t->zone_type) {
444 case TIMELIB_ZONETYPE_ABBR:
445 case TIMELIB_ZONETYPE_OFFSET:
446 return (t->z + t->dst) * -60;
447
448 case TIMELIB_ZONETYPE_ID:
449 gmt_offset = timelib_get_time_zone_info(t->sse, t->tz_info);
450 retval = gmt_offset->offset;
451 timelib_time_offset_dtor(gmt_offset);
452 return retval;
453
454 default:
455 return 0;
456 }
457 }
458
