1 /*
2 * The MIT License (MIT)
3 *
4 * Copyright (c) 2015 Derick Rethans
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "timelib.h"
26
27 #include <stdio.h>
28
29 #ifdef HAVE_LOCALE_H
30 #include <locale.h>
31 #endif
32
33 #ifdef HAVE_STRING_H
34 #include <string.h>
35 #else
36 #include <strings.h>
37 #endif
38
39 #define TIMELIB_SUPPORTS_V2DATA
40 #include "timezonedb.h"
41
42 #if (defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__))
43 # if defined(__LITTLE_ENDIAN__)
44 # undef WORDS_BIGENDIAN
45 # else
46 # if defined(__BIG_ENDIAN__)
47 # define WORDS_BIGENDIAN
48 # endif
49 # endif
50 #endif
51
52 #ifdef WORDS_BIGENDIAN
53 #define timelib_conv_int(l) (l)
54 #else
55 #define timelib_conv_int(l) ((l & 0x000000ff) << 24) + ((l & 0x0000ff00) << 8) + ((l & 0x00ff0000) >> 8) + ((l & 0xff000000) >> 24)
56 #endif
57
read_preamble(const unsigned char ** tzf,timelib_tzinfo * tz)58 static int read_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
59 {
60 uint32_t version;
61
62 /* read ID */
63 version = (*tzf)[3] - '0';
64 *tzf += 4;
65
66 /* read BC flag */
67 tz->bc = (**tzf == '\1');
68 *tzf += 1;
69
70 /* read country code */
71 memcpy(tz->location.country_code, *tzf, 2);
72 tz->location.country_code[2] = '\0';
73 *tzf += 2;
74
75 /* skip rest of preamble */
76 *tzf += 13;
77
78 return version;
79 }
80
read_header(const unsigned char ** tzf,timelib_tzinfo * tz)81 static void read_header(const unsigned char **tzf, timelib_tzinfo *tz)
82 {
83 uint32_t buffer[6];
84
85 memcpy(&buffer, *tzf, sizeof(buffer));
86 tz->bit32.ttisgmtcnt = timelib_conv_int(buffer[0]);
87 tz->bit32.ttisstdcnt = timelib_conv_int(buffer[1]);
88 tz->bit32.leapcnt = timelib_conv_int(buffer[2]);
89 tz->bit32.timecnt = timelib_conv_int(buffer[3]);
90 tz->bit32.typecnt = timelib_conv_int(buffer[4]);
91 tz->bit32.charcnt = timelib_conv_int(buffer[5]);
92 *tzf += sizeof(buffer);
93 }
94
skip_64bit_transistions(const unsigned char ** tzf,timelib_tzinfo * tz)95 static void skip_64bit_transistions(const unsigned char **tzf, timelib_tzinfo *tz)
96 {
97 if (tz->bit64.timecnt) {
98 *tzf += (sizeof(int64_t) * tz->bit64.timecnt);
99 *tzf += (sizeof(unsigned char) * tz->bit64.timecnt);
100 }
101 }
102
read_transistions(const unsigned char ** tzf,timelib_tzinfo * tz)103 static void read_transistions(const unsigned char **tzf, timelib_tzinfo *tz)
104 {
105 int32_t *buffer = NULL;
106 uint32_t i;
107 unsigned char *cbuffer = NULL;
108
109 if (tz->bit32.timecnt) {
110 buffer = (int32_t*) timelib_malloc(tz->bit32.timecnt * sizeof(int32_t));
111 if (!buffer) {
112 return;
113 }
114 memcpy(buffer, *tzf, sizeof(int32_t) * tz->bit32.timecnt);
115 *tzf += (sizeof(int32_t) * tz->bit32.timecnt);
116 for (i = 0; i < tz->bit32.timecnt; i++) {
117 buffer[i] = timelib_conv_int(buffer[i]);
118 }
119
120 cbuffer = (unsigned char*) timelib_malloc(tz->bit32.timecnt * sizeof(unsigned char));
121 if (!cbuffer) {
122 timelib_free(buffer);
123 return;
124 }
125 memcpy(cbuffer, *tzf, sizeof(unsigned char) * tz->bit32.timecnt);
126 *tzf += sizeof(unsigned char) * tz->bit32.timecnt;
127 }
128
129 tz->trans = buffer;
130 tz->trans_idx = cbuffer;
131 }
132
skip_64bit_types(const unsigned char ** tzf,timelib_tzinfo * tz)133 static void skip_64bit_types(const unsigned char **tzf, timelib_tzinfo *tz)
134 {
135 *tzf += sizeof(unsigned char) * 6 * tz->bit64.typecnt;
136 *tzf += sizeof(char) * tz->bit64.charcnt;
137 if (tz->bit64.leapcnt) {
138 *tzf += sizeof(int64_t) * tz->bit64.leapcnt * 2;
139 }
140 if (tz->bit64.ttisstdcnt) {
141 *tzf += sizeof(unsigned char) * tz->bit64.ttisstdcnt;
142 }
143 if (tz->bit64.ttisgmtcnt) {
144 *tzf += sizeof(unsigned char) * tz->bit64.ttisgmtcnt;
145 }
146 }
147
read_types(const unsigned char ** tzf,timelib_tzinfo * tz)148 static void read_types(const unsigned char **tzf, timelib_tzinfo *tz)
149 {
150 unsigned char *buffer;
151 int32_t *leap_buffer;
152 unsigned int i, j;
153
154 buffer = (unsigned char*) timelib_malloc(tz->bit32.typecnt * sizeof(unsigned char) * 6);
155 if (!buffer) {
156 return;
157 }
158 memcpy(buffer, *tzf, sizeof(unsigned char) * 6 * tz->bit32.typecnt);
159 *tzf += sizeof(unsigned char) * 6 * tz->bit32.typecnt;
160
161 tz->type = (ttinfo*) timelib_malloc(tz->bit32.typecnt * sizeof(struct ttinfo));
162 if (!tz->type) {
163 timelib_free(buffer);
164 return;
165 }
166
167 for (i = 0; i < tz->bit32.typecnt; i++) {
168 j = i * 6;
169 tz->type[i].offset = (buffer[j] * 16777216) + (buffer[j + 1] * 65536) + (buffer[j + 2] * 256) + buffer[j + 3];
170 tz->type[i].isdst = buffer[j + 4];
171 tz->type[i].abbr_idx = buffer[j + 5];
172 }
173 timelib_free(buffer);
174
175 tz->timezone_abbr = (char*) timelib_malloc(tz->bit32.charcnt);
176 if (!tz->timezone_abbr) {
177 return;
178 }
179 memcpy(tz->timezone_abbr, *tzf, sizeof(char) * tz->bit32.charcnt);
180 *tzf += sizeof(char) * tz->bit32.charcnt;
181
182 if (tz->bit32.leapcnt) {
183 leap_buffer = (int32_t *) timelib_malloc(tz->bit32.leapcnt * 2 * sizeof(int32_t));
184 if (!leap_buffer) {
185 return;
186 }
187 memcpy(leap_buffer, *tzf, sizeof(int32_t) * tz->bit32.leapcnt * 2);
188 *tzf += sizeof(int32_t) * tz->bit32.leapcnt * 2;
189
190 tz->leap_times = (tlinfo*) timelib_malloc(tz->bit32.leapcnt * sizeof(tlinfo));
191 if (!tz->leap_times) {
192 timelib_free(leap_buffer);
193 return;
194 }
195 for (i = 0; i < tz->bit32.leapcnt; i++) {
196 tz->leap_times[i].trans = timelib_conv_int(leap_buffer[i * 2]);
197 tz->leap_times[i].offset = timelib_conv_int(leap_buffer[i * 2 + 1]);
198 }
199 timelib_free(leap_buffer);
200 }
201
202 if (tz->bit32.ttisstdcnt) {
203 buffer = (unsigned char*) timelib_malloc(tz->bit32.ttisstdcnt * sizeof(unsigned char));
204 if (!buffer) {
205 return;
206 }
207 memcpy(buffer, *tzf, sizeof(unsigned char) * tz->bit32.ttisstdcnt);
208 *tzf += sizeof(unsigned char) * tz->bit32.ttisstdcnt;
209
210 for (i = 0; i < tz->bit32.ttisstdcnt; i++) {
211 tz->type[i].isstdcnt = buffer[i];
212 }
213 timelib_free(buffer);
214 }
215
216 if (tz->bit32.ttisgmtcnt) {
217 buffer = (unsigned char*) timelib_malloc(tz->bit32.ttisgmtcnt * sizeof(unsigned char));
218 if (!buffer) {
219 return;
220 }
221 memcpy(buffer, *tzf, sizeof(unsigned char) * tz->bit32.ttisgmtcnt);
222 *tzf += sizeof(unsigned char) * tz->bit32.ttisgmtcnt;
223
224 for (i = 0; i < tz->bit32.ttisgmtcnt; i++) {
225 tz->type[i].isgmtcnt = buffer[i];
226 }
227 timelib_free(buffer);
228 }
229 }
230
skip_posix_string(const unsigned char ** tzf,timelib_tzinfo * tz)231 static void skip_posix_string(const unsigned char **tzf, timelib_tzinfo *tz)
232 {
233 int n_count = 0;
234
235 do {
236 if (*tzf[0] == '\n') {
237 n_count++;
238 }
239 (*tzf)++;
240 } while (n_count < 2);
241 }
242
read_location(const unsigned char ** tzf,timelib_tzinfo * tz)243 static void read_location(const unsigned char **tzf, timelib_tzinfo *tz)
244 {
245 uint32_t buffer[3];
246 uint32_t comments_len;
247
248 memcpy(&buffer, *tzf, sizeof(buffer));
249 tz->location.latitude = timelib_conv_int(buffer[0]);
250 tz->location.latitude = (tz->location.latitude / 100000) - 90;
251 tz->location.longitude = timelib_conv_int(buffer[1]);
252 tz->location.longitude = (tz->location.longitude / 100000) - 180;
253 comments_len = timelib_conv_int(buffer[2]);
254 *tzf += sizeof(buffer);
255
256 tz->location.comments = timelib_malloc(comments_len + 1);
257 memcpy(tz->location.comments, *tzf, comments_len);
258 tz->location.comments[comments_len] = '\0';
259 *tzf += comments_len;
260 }
261
timelib_dump_tzinfo(timelib_tzinfo * tz)262 void timelib_dump_tzinfo(timelib_tzinfo *tz)
263 {
264 uint32_t i;
265
266 printf("Country Code: %s\n", tz->location.country_code);
267 printf("Geo Location: %f,%f\n", tz->location.latitude, tz->location.longitude);
268 printf("Comments:\n%s\n", tz->location.comments);
269 printf("BC: %s\n", tz->bc ? "" : "yes");
270 printf("UTC/Local count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit32.ttisgmtcnt);
271 printf("Std/Wall count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit32.ttisstdcnt);
272 printf("Leap.sec. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit32.leapcnt);
273 printf("Trans. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit32.timecnt);
274 printf("Local types count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit32.typecnt);
275 printf("Zone Abbr. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit32.charcnt);
276
277 printf ("%8s (%12s) = %3d [%5ld %1d %3d '%s' (%d,%d)]\n",
278 "", "", 0,
279 (long int) tz->type[0].offset,
280 tz->type[0].isdst,
281 tz->type[0].abbr_idx,
282 &tz->timezone_abbr[tz->type[0].abbr_idx],
283 tz->type[0].isstdcnt,
284 tz->type[0].isgmtcnt
285 );
286 for (i = 0; i < tz->bit32.timecnt; i++) {
287 printf ("%08X (%12d) = %3d [%5ld %1d %3d '%s' (%d,%d)]\n",
288 tz->trans[i], tz->trans[i], tz->trans_idx[i],
289 (long int) tz->type[tz->trans_idx[i]].offset,
290 tz->type[tz->trans_idx[i]].isdst,
291 tz->type[tz->trans_idx[i]].abbr_idx,
292 &tz->timezone_abbr[tz->type[tz->trans_idx[i]].abbr_idx],
293 tz->type[tz->trans_idx[i]].isstdcnt,
294 tz->type[tz->trans_idx[i]].isgmtcnt
295 );
296 }
297 for (i = 0; i < tz->bit32.leapcnt; i++) {
298 printf ("%08X (%12ld) = %d\n",
299 tz->leap_times[i].trans,
300 (long) tz->leap_times[i].trans,
301 tz->leap_times[i].offset);
302 }
303 }
304
seek_to_tz_position(const unsigned char ** tzf,char * timezone,const timelib_tzdb * tzdb)305 static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
306 {
307 int left = 0, right = tzdb->index_size - 1;
308 #ifdef HAVE_SETLOCALE
309 char *cur_locale = NULL, *tmp;
310
311 tmp = setlocale(LC_CTYPE, NULL);
312 if (tmp) {
313 cur_locale = timelib_strdup(tmp);
314 }
315 setlocale(LC_CTYPE, "C");
316 #endif
317
318 do {
319 int mid = ((unsigned)left + right) >> 1;
320 int cmp = strcasecmp(timezone, tzdb->index[mid].id);
321
322 if (cmp < 0) {
323 right = mid - 1;
324 } else if (cmp > 0) {
325 left = mid + 1;
326 } else { /* (cmp == 0) */
327 (*tzf) = &(tzdb->data[tzdb->index[mid].pos]);
328 #ifdef HAVE_SETLOCALE
329 setlocale(LC_CTYPE, cur_locale);
330 if (cur_locale) timelib_free(cur_locale);
331 #endif
332 return 1;
333 }
334
335 } while (left <= right);
336
337 #ifdef HAVE_SETLOCALE
338 setlocale(LC_CTYPE, cur_locale);
339 if (cur_locale) timelib_free(cur_locale);
340 #endif
341 return 0;
342 }
343
timelib_builtin_db(void)344 const timelib_tzdb *timelib_builtin_db(void)
345 {
346 return &timezonedb_builtin;
347 }
348
timelib_timezone_builtin_identifiers_list(int * count)349 const timelib_tzdb_index_entry *timelib_timezone_builtin_identifiers_list(int *count)
350 {
351 *count = sizeof(timezonedb_idx_builtin) / sizeof(*timezonedb_idx_builtin);
352 return timezonedb_idx_builtin;
353 }
354
timelib_timezone_id_is_valid(char * timezone,const timelib_tzdb * tzdb)355 int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
356 {
357 const unsigned char *tzf;
358 return (seek_to_tz_position(&tzf, timezone, tzdb));
359 }
360
skip_64bit_preamble(const unsigned char ** tzf,timelib_tzinfo * tz)361 static void skip_64bit_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
362 {
363 *tzf += 20;
364 }
365
read_64bit_header(const unsigned char ** tzf,timelib_tzinfo * tz)366 static void read_64bit_header(const unsigned char **tzf, timelib_tzinfo *tz)
367 {
368 uint32_t buffer[6];
369
370 memcpy(&buffer, *tzf, sizeof(buffer));
371 tz->bit64.ttisgmtcnt = timelib_conv_int(buffer[0]);
372 tz->bit64.ttisstdcnt = timelib_conv_int(buffer[1]);
373 tz->bit64.leapcnt = timelib_conv_int(buffer[2]);
374 tz->bit64.timecnt = timelib_conv_int(buffer[3]);
375 tz->bit64.typecnt = timelib_conv_int(buffer[4]);
376 tz->bit64.charcnt = timelib_conv_int(buffer[5]);
377 *tzf += sizeof(buffer);
378 }
379
timelib_parse_tzfile(char * timezone,const timelib_tzdb * tzdb)380 timelib_tzinfo *timelib_parse_tzfile(char *timezone, const timelib_tzdb *tzdb)
381 {
382 const unsigned char *tzf;
383 timelib_tzinfo *tmp;
384 int version;
385
386 if (seek_to_tz_position(&tzf, timezone, tzdb)) {
387 tmp = timelib_tzinfo_ctor(timezone);
388
389 version = read_preamble(&tzf, tmp);
390 read_header(&tzf, tmp);
391 read_transistions(&tzf, tmp);
392 read_types(&tzf, tmp);
393 if (version == 2) {
394 skip_64bit_preamble(&tzf, tmp);
395 read_64bit_header(&tzf, tmp);
396 skip_64bit_transistions(&tzf, tmp);
397 skip_64bit_types(&tzf, tmp);
398 skip_posix_string(&tzf, tmp);
399 }
400 read_location(&tzf, tmp);
401 } else {
402 tmp = NULL;
403 }
404
405 return tmp;
406 }
407
fetch_timezone_offset(timelib_tzinfo * tz,timelib_sll ts,timelib_sll * transition_time)408 static ttinfo* fetch_timezone_offset(timelib_tzinfo *tz, timelib_sll ts, timelib_sll *transition_time)
409 {
410 uint32_t i;
411
412 /* If there is no transition time, we pick the first one, if that doesn't
413 * exist we return NULL */
414 if (!tz->bit32.timecnt || !tz->trans) {
415 *transition_time = 0;
416 if (tz->bit32.typecnt == 1) {
417 return &(tz->type[0]);
418 }
419 return NULL;
420 }
421
422 /* If the TS is lower than the first transition time, then we scan over
423 * all the transition times to find the first non-DST one, or the first
424 * one in case there are only DST entries. Not sure which smartass came up
425 * with this idea in the first though :) */
426 if (ts < tz->trans[0]) {
427 uint32_t j;
428
429 *transition_time = 0;
430 j = 0;
431 while (j < tz->bit32.timecnt && tz->type[tz->trans_idx[j]].isdst) {
432 ++j;
433 }
434 if (j == tz->bit32.timecnt) {
435 j = 0;
436 }
437 return &(tz->type[tz->trans_idx[j]]);
438 }
439
440 /* In all other cases we loop through the available transtion times to find
441 * the correct entry */
442 for (i = 0; i < tz->bit32.timecnt; i++) {
443 if (ts < tz->trans[i]) {
444 *transition_time = tz->trans[i - 1];
445 return &(tz->type[tz->trans_idx[i - 1]]);
446 }
447 }
448 *transition_time = tz->trans[tz->bit32.timecnt - 1];
449 return &(tz->type[tz->trans_idx[tz->bit32.timecnt - 1]]);
450 }
451
fetch_leaptime_offset(timelib_tzinfo * tz,timelib_sll ts)452 static tlinfo* fetch_leaptime_offset(timelib_tzinfo *tz, timelib_sll ts)
453 {
454 int i;
455
456 if (!tz->bit32.leapcnt || !tz->leap_times) {
457 return NULL;
458 }
459
460 for (i = tz->bit32.leapcnt - 1; i > 0; i--) {
461 if (ts > tz->leap_times[i].trans) {
462 return &(tz->leap_times[i]);
463 }
464 }
465 return NULL;
466 }
467
timelib_timestamp_is_in_dst(timelib_sll ts,timelib_tzinfo * tz)468 int timelib_timestamp_is_in_dst(timelib_sll ts, timelib_tzinfo *tz)
469 {
470 ttinfo *to;
471 timelib_sll dummy;
472
473 if ((to = fetch_timezone_offset(tz, ts, &dummy))) {
474 return to->isdst;
475 }
476 return -1;
477 }
478
timelib_get_time_zone_info(timelib_sll ts,timelib_tzinfo * tz)479 timelib_time_offset *timelib_get_time_zone_info(timelib_sll ts, timelib_tzinfo *tz)
480 {
481 ttinfo *to;
482 tlinfo *tl;
483 int32_t offset = 0, leap_secs = 0;
484 char *abbr;
485 timelib_time_offset *tmp = timelib_time_offset_ctor();
486 timelib_sll transistion_time;
487
488 if ((to = fetch_timezone_offset(tz, ts, &transistion_time))) {
489 offset = to->offset;
490 abbr = &(tz->timezone_abbr[to->abbr_idx]);
491 tmp->is_dst = to->isdst;
492 tmp->transistion_time = transistion_time;
493 } else {
494 offset = 0;
495 abbr = tz->timezone_abbr;
496 tmp->is_dst = 0;
497 tmp->transistion_time = 0;
498 }
499
500 if ((tl = fetch_leaptime_offset(tz, ts))) {
501 leap_secs = -tl->offset;
502 }
503
504 tmp->offset = offset;
505 tmp->leap_secs = leap_secs;
506 tmp->abbr = abbr ? timelib_strdup(abbr) : timelib_strdup("GMT");
507
508 return tmp;
509 }
510
timelib_get_current_offset(timelib_time * t)511 timelib_sll timelib_get_current_offset(timelib_time *t)
512 {
513 timelib_time_offset *gmt_offset;
514 timelib_sll retval;
515
516 switch (t->zone_type) {
517 case TIMELIB_ZONETYPE_ABBR:
518 case TIMELIB_ZONETYPE_OFFSET:
519 return (t->z + t->dst) * -60;
520
521 case TIMELIB_ZONETYPE_ID:
522 gmt_offset = timelib_get_time_zone_info(t->sse, t->tz_info);
523 retval = gmt_offset->offset;
524 timelib_time_offset_dtor(gmt_offset);
525 return retval;
526
527 default:
528 return 0;
529 }
530 }
531
