Line data Source code
1 : /*
2 : * The MIT License (MIT)
3 : *
4 : * Copyright (c) 2015-2019 Derick Rethans
5 : * Copyright (c) 2018 MongoDB, Inc.
6 : *
7 : * Permission is hereby granted, free of charge, to any person obtaining a copy
8 : * of this software and associated documentation files (the "Software"), to deal
9 : * in the Software without restriction, including without limitation the rights
10 : * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 : * copies of the Software, and to permit persons to whom the Software is
12 : * furnished to do so, subject to the following conditions:
13 : *
14 : * The above copyright notice and this permission notice shall be included in
15 : * all copies or substantial portions of the Software.
16 : *
17 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 : * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 : * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 : * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 : * THE SOFTWARE.
24 : */
25 :
26 : #include "timelib.h"
27 : #include "timelib_private.h"
28 :
29 : #define TIMELIB_SUPPORTS_V2DATA
30 : #define TIMELIB_SUPPORT_SLIM_FILE
31 : #include "timezonedb.h"
32 :
33 : #if (defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__))
34 : # if defined(__LITTLE_ENDIAN__)
35 : # undef WORDS_BIGENDIAN
36 : # else
37 : # if defined(__BIG_ENDIAN__)
38 : # define WORDS_BIGENDIAN
39 : # endif
40 : # endif
41 : #endif
42 :
43 : #if (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN))
44 : # if __BYTE_ORDER == __BIG_ENDIAN
45 : # define WORDS_BIGENDIAN
46 : # endif
47 : #endif
48 :
49 : #if defined(__s390__)
50 : # if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
51 : # define WORDS_BIGENDIAN
52 : # else
53 : # undef WORDS_BIGENDIAN
54 : # endif
55 : #endif
56 :
57 : #ifdef WORDS_BIGENDIAN
58 : static inline uint32_t timelib_conv_int_unsigned(uint32_t value)
59 : {
60 : return value;
61 : }
62 :
63 : static inline uint64_t timelib_conv_int64_unsigned(uint64_t value)
64 : {
65 : return value;
66 : }
67 : #else
68 0 : static inline uint32_t timelib_conv_int_unsigned(uint32_t value)
69 : {
70 : return
71 0 : ((value & 0x000000ff) << 24) +
72 0 : ((value & 0x0000ff00) << 8) +
73 0 : ((value & 0x00ff0000) >> 8) +
74 0 : ((value & 0xff000000) >> 24);
75 : }
76 :
77 0 : static inline uint64_t timelib_conv_int64_unsigned(uint64_t value)
78 : {
79 : return
80 0 : ((value & 0x00000000000000ff) << 56) +
81 0 : ((value & 0x000000000000ff00) << 40) +
82 0 : ((value & 0x0000000000ff0000) << 24) +
83 0 : ((value & 0x00000000ff000000) << 8) +
84 0 : ((value & 0x000000ff00000000) >> 8) +
85 0 : ((value & 0x0000ff0000000000) >> 24) +
86 0 : ((value & 0x00ff000000000000) >> 40) +
87 0 : ((value & 0xff00000000000000) >> 56);
88 : }
89 : #endif
90 :
91 : #define timelib_conv_int_signed(value) ((int32_t) timelib_conv_int_unsigned((int32_t) value))
92 : #define timelib_conv_int64_signed(value) ((int64_t) timelib_conv_int64_unsigned((int64_t) value))
93 :
94 0 : static int read_php_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
95 : {
96 : uint32_t version;
97 :
98 : /* read ID */
99 0 : version = (*tzf)[3] - '0';
100 0 : *tzf += 4;
101 :
102 : /* read BC flag */
103 0 : tz->bc = (**tzf == '\1');
104 0 : *tzf += 1;
105 :
106 : /* read country code */
107 0 : memcpy(tz->location.country_code, *tzf, 2);
108 0 : tz->location.country_code[2] = '\0';
109 0 : *tzf += 2;
110 :
111 : /* skip rest of preamble */
112 0 : *tzf += 13;
113 :
114 0 : return version;
115 : }
116 :
117 0 : static int read_tzif_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
118 : {
119 : uint32_t version;
120 :
121 : /* read ID */
122 0 : switch ((*tzf)[4]) {
123 0 : case '\0':
124 0 : version = 0;
125 0 : break;
126 0 : case '2':
127 0 : version = 2;
128 0 : break;
129 0 : case '3':
130 0 : version = 3;
131 0 : break;
132 0 : case '4':
133 0 : version = 4;
134 0 : break;
135 0 : default:
136 0 : return -1;
137 : }
138 0 : *tzf += 5;
139 :
140 : /* set BC flag and country code to default */
141 0 : tz->bc = 0;
142 0 : tz->location.country_code[0] = '?';
143 0 : tz->location.country_code[1] = '?';
144 0 : tz->location.country_code[2] = '\0';
145 :
146 : /* skip rest of preamble */
147 0 : *tzf += 15;
148 :
149 0 : return version;
150 : }
151 :
152 0 : static int read_preamble(const unsigned char **tzf, timelib_tzinfo *tz, unsigned int *type)
153 : {
154 : /* read marker (TZif) or (PHP) */
155 0 : if (memcmp(*tzf, "PHP", 3) == 0) {
156 0 : *type = TIMELIB_TZINFO_PHP;
157 0 : return read_php_preamble(tzf, tz);
158 0 : } else if (memcmp(*tzf, "TZif", 4) == 0) {
159 0 : *type = TIMELIB_TZINFO_ZONEINFO;
160 0 : return read_tzif_preamble(tzf, tz);
161 : } else {
162 0 : return -1;
163 : }
164 : }
165 :
166 0 : static void read_32bit_header(const unsigned char **tzf, timelib_tzinfo *tz)
167 : {
168 : uint32_t buffer[6];
169 :
170 0 : memcpy(&buffer, *tzf, sizeof(buffer));
171 0 : tz->_bit32.ttisgmtcnt = timelib_conv_int_unsigned(buffer[0]);
172 0 : tz->_bit32.ttisstdcnt = timelib_conv_int_unsigned(buffer[1]);
173 0 : tz->_bit32.leapcnt = timelib_conv_int_unsigned(buffer[2]);
174 0 : tz->_bit32.timecnt = timelib_conv_int_unsigned(buffer[3]);
175 0 : tz->_bit32.typecnt = timelib_conv_int_unsigned(buffer[4]);
176 0 : tz->_bit32.charcnt = timelib_conv_int_unsigned(buffer[5]);
177 :
178 0 : *tzf += sizeof(buffer);
179 0 : }
180 :
181 0 : static int detect_slim_file(timelib_tzinfo *tz)
182 : {
183 0 : if (
184 0 : (tz->_bit32.ttisgmtcnt == 0) &&
185 0 : (tz->_bit32.ttisstdcnt == 0) &&
186 0 : (tz->_bit32.leapcnt == 0) &&
187 0 : (tz->_bit32.timecnt == 0) &&
188 0 : (tz->_bit32.typecnt == 1) &&
189 0 : (tz->_bit32.charcnt == 1)
190 : ) {
191 0 : return 1;
192 : }
193 :
194 0 : return 0;
195 : }
196 :
197 0 : static int read_64bit_transitions(const unsigned char **tzf, timelib_tzinfo *tz)
198 : {
199 0 : int64_t *buffer = NULL;
200 : uint32_t i;
201 0 : unsigned char *cbuffer = NULL;
202 :
203 0 : if (tz->bit64.timecnt) {
204 0 : buffer = (int64_t*) timelib_malloc(tz->bit64.timecnt * sizeof(int64_t));
205 0 : if (!buffer) {
206 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
207 : }
208 0 : memcpy(buffer, *tzf, sizeof(int64_t) * tz->bit64.timecnt);
209 0 : *tzf += (sizeof(int64_t) * tz->bit64.timecnt);
210 0 : for (i = 0; i < tz->bit64.timecnt; i++) {
211 0 : buffer[i] = timelib_conv_int64_signed(buffer[i]);
212 : /* Sanity check to see whether TS is just increasing */
213 0 : if (i > 0 && !(buffer[i] > buffer[i - 1])) {
214 0 : timelib_free(buffer);
215 0 : return TIMELIB_ERROR_CORRUPT_TRANSITIONS_DONT_INCREASE;
216 : }
217 : }
218 :
219 0 : cbuffer = (unsigned char*) timelib_malloc(tz->bit64.timecnt * sizeof(unsigned char));
220 0 : if (!cbuffer) {
221 0 : timelib_free(buffer);
222 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
223 : }
224 0 : memcpy(cbuffer, *tzf, sizeof(unsigned char) * tz->bit64.timecnt);
225 0 : *tzf += sizeof(unsigned char) * tz->bit64.timecnt;
226 : }
227 :
228 0 : tz->trans = buffer;
229 0 : tz->trans_idx = cbuffer;
230 :
231 0 : return 0;
232 : }
233 :
234 0 : static void skip_32bit_transitions(const unsigned char **tzf, timelib_tzinfo *tz)
235 : {
236 0 : if (tz->_bit32.timecnt) {
237 0 : *tzf += (sizeof(int32_t) * tz->_bit32.timecnt);
238 0 : *tzf += sizeof(unsigned char) * tz->_bit32.timecnt;
239 : }
240 0 : }
241 :
242 0 : static int read_64bit_types(const unsigned char **tzf, timelib_tzinfo *tz)
243 : {
244 : unsigned char *buffer;
245 : int32_t *leap_buffer;
246 : unsigned int i, j;
247 :
248 : /* Offset Types */
249 0 : buffer = (unsigned char*) timelib_malloc(tz->bit64.typecnt * sizeof(unsigned char) * 6);
250 0 : if (!buffer) {
251 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
252 : }
253 0 : memcpy(buffer, *tzf, sizeof(unsigned char) * 6 * tz->bit64.typecnt);
254 0 : *tzf += sizeof(unsigned char) * 6 * tz->bit64.typecnt;
255 :
256 : // We add two extra to have space for potential new ttinfo entries due to new types defined in the
257 : // POSIX string
258 0 : tz->type = (ttinfo*) timelib_calloc(1, (tz->bit64.typecnt + 2) * sizeof(ttinfo));
259 0 : if (!tz->type) {
260 0 : timelib_free(buffer);
261 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
262 : }
263 :
264 0 : for (i = 0; i < tz->bit64.typecnt; i++) {
265 0 : j = i * 6;
266 0 : tz->type[i].offset = 0;
267 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];
268 0 : tz->type[i].isdst = buffer[j + 4];
269 0 : tz->type[i].abbr_idx = buffer[j + 5];
270 : }
271 0 : timelib_free(buffer);
272 :
273 : /* Abbreviations */
274 0 : tz->timezone_abbr = (char*) timelib_malloc(tz->bit64.charcnt);
275 0 : if (!tz->timezone_abbr) {
276 0 : return TIMELIB_ERROR_CORRUPT_NO_ABBREVIATION;
277 : }
278 0 : memcpy(tz->timezone_abbr, *tzf, sizeof(char) * tz->bit64.charcnt);
279 0 : *tzf += sizeof(char) * tz->bit64.charcnt;
280 :
281 : /* Leap seconds (only use in 'right/') format */
282 0 : if (tz->bit64.leapcnt) {
283 0 : leap_buffer = (int32_t *) timelib_malloc(tz->bit64.leapcnt * (sizeof(int64_t) + sizeof(int32_t)));
284 0 : if (!leap_buffer) {
285 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
286 : }
287 0 : memcpy(leap_buffer, *tzf, tz->bit64.leapcnt * (sizeof(int64_t) + sizeof(int32_t)));
288 0 : *tzf += tz->bit64.leapcnt * (sizeof(int64_t) + sizeof(int32_t));
289 :
290 0 : tz->leap_times = (tlinfo*) timelib_malloc(tz->bit64.leapcnt * sizeof(tlinfo));
291 0 : if (!tz->leap_times) {
292 0 : timelib_free(leap_buffer);
293 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
294 : }
295 0 : for (i = 0; i < tz->bit64.leapcnt; i++) {
296 0 : tz->leap_times[i].trans = timelib_conv_int64_signed(leap_buffer[i * 3 + 1] * 4294967296 + leap_buffer[i * 3]);
297 0 : tz->leap_times[i].offset = timelib_conv_int_signed(leap_buffer[i * 3 + 2]);
298 : }
299 0 : timelib_free(leap_buffer);
300 : }
301 :
302 : /* Standard/Wall Indicators (unused) */
303 0 : if (tz->bit64.ttisstdcnt) {
304 0 : buffer = (unsigned char*) timelib_malloc(tz->bit64.ttisstdcnt * sizeof(unsigned char));
305 0 : if (!buffer) {
306 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
307 : }
308 0 : memcpy(buffer, *tzf, sizeof(unsigned char) * tz->bit64.ttisstdcnt);
309 0 : *tzf += sizeof(unsigned char) * tz->bit64.ttisstdcnt;
310 :
311 0 : for (i = 0; i < tz->bit64.ttisstdcnt; i++) {
312 0 : tz->type[i].isstdcnt = buffer[i];
313 : }
314 0 : timelib_free(buffer);
315 : }
316 :
317 : /* UT/Local Time Indicators (unused) */
318 0 : if (tz->bit64.ttisgmtcnt) {
319 0 : buffer = (unsigned char*) timelib_malloc(tz->bit64.ttisgmtcnt * sizeof(unsigned char));
320 0 : if (!buffer) {
321 0 : return TIMELIB_ERROR_CANNOT_ALLOCATE;
322 : }
323 0 : memcpy(buffer, *tzf, sizeof(unsigned char) * tz->bit64.ttisgmtcnt);
324 0 : *tzf += sizeof(unsigned char) * tz->bit64.ttisgmtcnt;
325 :
326 0 : for (i = 0; i < tz->bit64.ttisgmtcnt; i++) {
327 0 : tz->type[i].isgmtcnt = buffer[i];
328 : }
329 0 : timelib_free(buffer);
330 : }
331 :
332 0 : return 0;
333 : }
334 :
335 0 : static void skip_32bit_types(const unsigned char **tzf, timelib_tzinfo *tz)
336 : {
337 : /* Offset Types */
338 0 : *tzf += sizeof(unsigned char) * 6 * tz->_bit32.typecnt;
339 :
340 : /* Abbreviations */
341 0 : *tzf += sizeof(char) * tz->_bit32.charcnt;
342 :
343 : /* Leap seconds (only use in 'right/') format */
344 0 : if (tz->_bit32.leapcnt) {
345 0 : *tzf += sizeof(int32_t) * tz->_bit32.leapcnt * 2;
346 : }
347 :
348 : /* Standard/Wall Indicators (unused) */
349 0 : if (tz->_bit32.ttisstdcnt) {
350 0 : *tzf += sizeof(unsigned char) * tz->_bit32.ttisstdcnt;
351 : }
352 :
353 : /* UT/Local Time Indicators (unused) */
354 0 : if (tz->_bit32.ttisgmtcnt) {
355 0 : *tzf += sizeof(unsigned char) * tz->_bit32.ttisgmtcnt;
356 : }
357 0 : }
358 :
359 0 : static void read_posix_string(const unsigned char **tzf, timelib_tzinfo *tz)
360 : {
361 : const unsigned char *begin;
362 :
363 : // POSIX string is delimited by \n
364 0 : (*tzf)++;
365 0 : begin = *tzf;
366 :
367 0 : while (*tzf[0] != '\n') {
368 0 : (*tzf)++;
369 : }
370 :
371 0 : tz->posix_string = timelib_calloc(1, *tzf - begin + 1);
372 0 : memcpy(tz->posix_string, begin, *tzf - begin);
373 :
374 : // skip over closing \n
375 0 : (*tzf)++;
376 0 : }
377 :
378 0 : static signed int find_ttinfo_index(timelib_tzinfo *tz, int32_t offset, int isdst, char *abbr)
379 : {
380 : uint64_t i;
381 :
382 0 : for (i = 0; i < tz->bit64.typecnt; i++) {
383 0 : if (
384 0 : (offset == tz->type[i].offset) &&
385 0 : (isdst == tz->type[i].isdst) &&
386 0 : (strcmp(abbr, &tz->timezone_abbr[tz->type[i].abbr_idx]) == 0)
387 : ) {
388 0 : return i;
389 : }
390 : }
391 :
392 0 : return TIMELIB_UNSET;
393 : }
394 :
395 0 : static unsigned int add_abbr(timelib_tzinfo *tz, char *abbr)
396 : {
397 0 : size_t old_length = tz->bit64.charcnt;
398 0 : size_t new_length = old_length + strlen(abbr) + 1;
399 0 : tz->timezone_abbr = (char*) timelib_realloc(tz->timezone_abbr, new_length);
400 0 : memcpy(tz->timezone_abbr + old_length, abbr, strlen(abbr));
401 0 : tz->bit64.charcnt = new_length;
402 0 : tz->timezone_abbr[new_length - 1] = '\0';
403 :
404 0 : return old_length;
405 : }
406 :
407 0 : static signed int add_new_ttinfo_index(timelib_tzinfo *tz, int32_t offset, int isdst, char *abbr)
408 : {
409 0 : tz->type[tz->bit64.typecnt].offset = offset;
410 0 : tz->type[tz->bit64.typecnt].isdst = isdst;
411 0 : tz->type[tz->bit64.typecnt].abbr_idx = add_abbr(tz, abbr);
412 0 : tz->type[tz->bit64.typecnt].isstdcnt = 0;
413 0 : tz->type[tz->bit64.typecnt].isgmtcnt = 0;
414 :
415 0 : ++tz->bit64.typecnt;
416 :
417 0 : return tz->bit64.typecnt - 1;
418 : }
419 :
420 0 : static int integrate_posix_string(timelib_tzinfo *tz)
421 : {
422 0 : tz->posix_info = timelib_parse_posix_str(tz->posix_string);
423 0 : if (!tz->posix_info) {
424 0 : return 0;
425 : }
426 :
427 0 : tz->posix_info->type_index_std_type = find_ttinfo_index(tz, tz->posix_info->std_offset, 0, tz->posix_info->std);
428 0 : if (tz->posix_info->type_index_std_type == TIMELIB_UNSET) {
429 0 : tz->posix_info->type_index_std_type = add_new_ttinfo_index(tz, tz->posix_info->std_offset, 0, tz->posix_info->std);
430 0 : return 1;
431 : }
432 :
433 : /* If there is no DST set for this zone, return */
434 0 : if (!tz->posix_info->dst) {
435 0 : return 1;
436 : }
437 :
438 0 : tz->posix_info->type_index_dst_type = find_ttinfo_index(tz, tz->posix_info->dst_offset, 1, tz->posix_info->dst);
439 0 : if (tz->posix_info->type_index_dst_type == TIMELIB_UNSET) {
440 0 : tz->posix_info->type_index_dst_type = add_new_ttinfo_index(tz, tz->posix_info->dst_offset, 1, tz->posix_info->dst);
441 0 : return 1;
442 : }
443 :
444 0 : return 1;
445 : }
446 :
447 0 : static void read_location(const unsigned char **tzf, timelib_tzinfo *tz)
448 : {
449 : uint32_t buffer[3];
450 : uint32_t comments_len;
451 :
452 0 : memcpy(&buffer, *tzf, sizeof(buffer));
453 0 : tz->location.latitude = timelib_conv_int_unsigned(buffer[0]);
454 0 : tz->location.latitude = (tz->location.latitude / 100000) - 90;
455 0 : tz->location.longitude = timelib_conv_int_unsigned(buffer[1]);
456 0 : tz->location.longitude = (tz->location.longitude / 100000) - 180;
457 0 : comments_len = timelib_conv_int_unsigned(buffer[2]);
458 0 : *tzf += sizeof(buffer);
459 :
460 0 : tz->location.comments = timelib_malloc(comments_len + 1);
461 0 : memcpy(tz->location.comments, *tzf, comments_len);
462 0 : tz->location.comments[comments_len] = '\0';
463 0 : *tzf += comments_len;
464 0 : }
465 :
466 0 : static void set_default_location_and_comments(const unsigned char **tzf, timelib_tzinfo *tz)
467 : {
468 0 : tz->location.latitude = 0;
469 0 : tz->location.longitude = 0;
470 0 : tz->location.comments = timelib_malloc(2);
471 0 : tz->location.comments[0] = '?';
472 0 : tz->location.comments[1] = '\0';
473 0 : }
474 :
475 0 : static char *format_ut_time(timelib_sll ts, timelib_tzinfo *tz)
476 : {
477 0 : char *tmp = timelib_calloc(1, 64);
478 0 : timelib_time *t = timelib_time_ctor();
479 :
480 0 : timelib_unixtime2gmt(t, ts);
481 0 : snprintf(
482 : tmp, 64,
483 : "%04lld-%02lld-%02lld %02lld:%02lld:%02lld UT",
484 : t->y, t->m, t->d,
485 : t->h, t->i, t->s
486 : );
487 :
488 0 : timelib_time_dtor(t);
489 0 : return tmp;
490 : }
491 :
492 0 : static char *format_offset_type(timelib_tzinfo *tz, int i)
493 : {
494 0 : char *tmp = timelib_calloc(1, 64);
495 :
496 0 : snprintf(
497 : tmp, 64,
498 : "%3d [%6ld %1d %3d '%s' (%d,%d)]",
499 : i,
500 0 : (long int) tz->type[i].offset,
501 0 : tz->type[i].isdst,
502 0 : tz->type[i].abbr_idx,
503 0 : &tz->timezone_abbr[tz->type[i].abbr_idx],
504 0 : tz->type[i].isstdcnt,
505 0 : tz->type[i].isgmtcnt
506 : );
507 :
508 0 : return tmp;
509 : }
510 :
511 0 : void timelib_dump_tzinfo(timelib_tzinfo *tz)
512 : {
513 : uint32_t i;
514 : char *date_str, *trans_str;
515 :
516 0 : printf("Country Code: %s\n", tz->location.country_code);
517 0 : printf("Geo Location: %f,%f\n", tz->location.latitude, tz->location.longitude);
518 0 : printf("Comments:\n%s\n", tz->location.comments);
519 0 : printf("BC: %s\n", tz->bc ? "no" : "yes");
520 0 : printf("Slim File: %s\n", detect_slim_file(tz) ? "yes" : "no");
521 :
522 0 : printf("\n64-bit:\n");
523 0 : printf("UTC/Local count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.ttisgmtcnt);
524 0 : printf("Std/Wall count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.ttisstdcnt);
525 0 : printf("Leap.sec. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.leapcnt);
526 0 : printf("Trans. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.timecnt);
527 0 : printf("Local types count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.typecnt);
528 0 : printf("Zone Abbr. count: " TIMELIB_ULONG_FMT "\n", (timelib_ulong) tz->bit64.charcnt);
529 :
530 0 : trans_str = format_offset_type(tz, 0);
531 0 : printf("%22s (%20s) = %s\n", "", "", trans_str);
532 0 : timelib_free(trans_str);
533 :
534 0 : for (i = 0; i < tz->bit64.timecnt; i++) {
535 0 : date_str = format_ut_time(tz->trans[i], tz);
536 0 : trans_str = format_offset_type(tz, tz->trans_idx[i]);
537 0 : printf(
538 : "%s (%20" PRId64 ") = %s\n",
539 : date_str,
540 0 : tz->trans[i],
541 : trans_str
542 : );
543 0 : timelib_free(date_str);
544 0 : timelib_free(trans_str);
545 : }
546 0 : for (i = 0; i < tz->bit64.leapcnt; i++) {
547 0 : date_str = format_ut_time(tz->leap_times[i].trans, tz);
548 0 : printf (
549 : "%s (%20ld) = %d\n",
550 : date_str,
551 0 : (long) tz->leap_times[i].trans,
552 0 : tz->leap_times[i].offset
553 : );
554 0 : timelib_free(date_str);
555 : }
556 :
557 0 : if (!tz->posix_string) {
558 0 : printf("\n%43sNo POSIX string\n", "");
559 0 : return;
560 : }
561 :
562 0 : if (strcmp("", tz->posix_string) == 0) {
563 0 : printf("\n%43sEmpty POSIX string\n", "");
564 0 : return;
565 : }
566 :
567 0 : printf("\n%43sPOSIX string: %s\n", "", tz->posix_string);
568 0 : if (tz->posix_info && tz->posix_info->std) {
569 0 : trans_str = format_offset_type(tz, tz->posix_info->type_index_std_type);
570 0 : printf("%43sstd: %s\n", "", trans_str);
571 0 : timelib_free(trans_str);
572 :
573 0 : if (tz->posix_info->dst) {
574 0 : trans_str = format_offset_type(tz, tz->posix_info->type_index_dst_type);
575 0 : printf("%43sdst: %s\n", "", trans_str);
576 0 : timelib_free(trans_str);
577 : }
578 : }
579 : }
580 :
581 0 : static int seek_to_tz_position(const unsigned char **tzf, const char *timezone, const timelib_tzdb *tzdb)
582 : {
583 0 : int left = 0, right = tzdb->index_size - 1;
584 :
585 0 : if (tzdb->index_size == 0) {
586 0 : return 0;
587 : }
588 :
589 : do {
590 0 : int mid = ((unsigned)left + right) >> 1;
591 0 : int cmp = timelib_strcasecmp(timezone, tzdb->index[mid].id);
592 :
593 0 : if (cmp < 0) {
594 0 : right = mid - 1;
595 0 : } else if (cmp > 0) {
596 0 : left = mid + 1;
597 : } else { /* (cmp == 0) */
598 0 : (*tzf) = &(tzdb->data[tzdb->index[mid].pos]);
599 0 : return 1;
600 : }
601 :
602 0 : } while (left <= right);
603 :
604 0 : return 0;
605 : }
606 :
607 0 : const timelib_tzdb *timelib_builtin_db(void)
608 : {
609 0 : return &timezonedb_builtin;
610 : }
611 :
612 0 : const timelib_tzdb_index_entry *timelib_timezone_identifiers_list(const timelib_tzdb *tzdb, int *count)
613 : {
614 0 : *count = tzdb->index_size;
615 0 : return tzdb->index;
616 : }
617 :
618 0 : int timelib_timezone_id_is_valid(const char *timezone, const timelib_tzdb *tzdb)
619 : {
620 : const unsigned char *tzf;
621 0 : return (seek_to_tz_position(&tzf, timezone, tzdb));
622 : }
623 :
624 0 : static int skip_64bit_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
625 : {
626 0 : if (memcmp(*tzf, "TZif2", 5) == 0) {
627 0 : *tzf += 20;
628 0 : return 1;
629 0 : } else if (memcmp(*tzf, "TZif3", 5) == 0) {
630 0 : *tzf += 20;
631 0 : return 1;
632 0 : } else if (memcmp(*tzf, "TZif4", 5) == 0) {
633 0 : *tzf += 20;
634 0 : return 1;
635 : } else {
636 0 : return 0;
637 : }
638 : }
639 :
640 0 : static void read_64bit_header(const unsigned char **tzf, timelib_tzinfo *tz)
641 : {
642 : uint32_t buffer[6];
643 :
644 0 : memcpy(&buffer, *tzf, sizeof(buffer));
645 0 : tz->bit64.ttisgmtcnt = timelib_conv_int_unsigned(buffer[0]);
646 0 : tz->bit64.ttisstdcnt = timelib_conv_int_unsigned(buffer[1]);
647 0 : tz->bit64.leapcnt = timelib_conv_int_unsigned(buffer[2]);
648 0 : tz->bit64.timecnt = timelib_conv_int_unsigned(buffer[3]);
649 0 : tz->bit64.typecnt = timelib_conv_int_unsigned(buffer[4]);
650 0 : tz->bit64.charcnt = timelib_conv_int_unsigned(buffer[5]);
651 0 : *tzf += sizeof(buffer);
652 0 : }
653 :
654 0 : static timelib_tzinfo* timelib_tzinfo_ctor(const char *name)
655 : {
656 : timelib_tzinfo *t;
657 0 : t = timelib_calloc(1, sizeof(timelib_tzinfo));
658 0 : t->name = timelib_strdup(name);
659 :
660 0 : return t;
661 : }
662 :
663 0 : timelib_tzinfo *timelib_parse_tzfile(const char *timezone, const timelib_tzdb *tzdb, int *error_code)
664 : {
665 : const unsigned char *tzf;
666 : timelib_tzinfo *tmp;
667 : int version;
668 : int transitions_result, types_result;
669 0 : unsigned int type = TIMELIB_TZINFO_ZONEINFO; /* TIMELIB_TZINFO_PHP or TIMELIB_TZINFO_ZONEINFO */
670 :
671 0 : *error_code = TIMELIB_ERROR_NO_ERROR;
672 :
673 0 : if (seek_to_tz_position(&tzf, timezone, tzdb)) {
674 0 : tmp = timelib_tzinfo_ctor(timezone);
675 :
676 0 : version = read_preamble(&tzf, tmp, &type);
677 0 : if (version < 2 || version > 4) {
678 0 : *error_code = TIMELIB_ERROR_UNSUPPORTED_VERSION;
679 0 : timelib_tzinfo_dtor(tmp);
680 0 : return NULL;
681 : }
682 : //printf("- timezone: %s, version: %0d\n", timezone, version);
683 :
684 0 : read_32bit_header(&tzf, tmp);
685 0 : skip_32bit_transitions(&tzf, tmp);
686 0 : skip_32bit_types(&tzf, tmp);
687 :
688 0 : if (!skip_64bit_preamble(&tzf, tmp)) {
689 : /* 64 bit preamble is not in place */
690 0 : *error_code = TIMELIB_ERROR_CORRUPT_NO_64BIT_PREAMBLE;
691 0 : timelib_tzinfo_dtor(tmp);
692 0 : return NULL;
693 : }
694 0 : read_64bit_header(&tzf, tmp);
695 0 : if ((transitions_result = read_64bit_transitions(&tzf, tmp)) != 0) {
696 : /* Corrupt file as transitions do not increase */
697 0 : *error_code = transitions_result;
698 0 : timelib_tzinfo_dtor(tmp);
699 0 : return NULL;
700 : }
701 0 : if ((types_result = read_64bit_types(&tzf, tmp)) != 0) {
702 0 : *error_code = types_result;
703 0 : timelib_tzinfo_dtor(tmp);
704 0 : return NULL;
705 : }
706 :
707 0 : read_posix_string(&tzf, tmp);
708 0 : if (strcmp("", tmp->posix_string) == 0) {
709 0 : *error_code = TIMELIB_ERROR_EMPTY_POSIX_STRING;
710 0 : } else if (!integrate_posix_string(tmp)) {
711 0 : *error_code = TIMELIB_ERROR_CORRUPT_POSIX_STRING;
712 0 : timelib_tzinfo_dtor(tmp);
713 0 : return NULL;
714 : }
715 :
716 0 : if (type == TIMELIB_TZINFO_PHP) {
717 0 : read_location(&tzf, tmp);
718 : } else {
719 0 : set_default_location_and_comments(&tzf, tmp);
720 : }
721 : } else {
722 0 : *error_code = TIMELIB_ERROR_NO_SUCH_TIMEZONE;
723 0 : tmp = NULL;
724 : }
725 :
726 0 : return tmp;
727 : }
728 :
729 0 : void timelib_tzinfo_dtor(timelib_tzinfo *tz)
730 : {
731 0 : TIMELIB_TIME_FREE(tz->name);
732 0 : TIMELIB_TIME_FREE(tz->trans);
733 0 : TIMELIB_TIME_FREE(tz->trans_idx);
734 0 : TIMELIB_TIME_FREE(tz->type);
735 0 : TIMELIB_TIME_FREE(tz->timezone_abbr);
736 0 : TIMELIB_TIME_FREE(tz->leap_times);
737 0 : TIMELIB_TIME_FREE(tz->location.comments);
738 0 : TIMELIB_TIME_FREE(tz->posix_string);
739 0 : if (tz->posix_info) {
740 0 : timelib_posix_str_dtor(tz->posix_info);
741 : }
742 0 : TIMELIB_TIME_FREE(tz);
743 0 : tz = NULL;
744 0 : }
745 :
746 0 : timelib_tzinfo *timelib_tzinfo_clone(timelib_tzinfo *tz)
747 : {
748 0 : timelib_tzinfo *tmp = timelib_tzinfo_ctor(tz->name);
749 0 : tmp->_bit32.ttisgmtcnt = tz->_bit32.ttisgmtcnt;
750 0 : tmp->_bit32.ttisstdcnt = tz->_bit32.ttisstdcnt;
751 0 : tmp->_bit32.leapcnt = tz->_bit32.leapcnt;
752 0 : tmp->_bit32.timecnt = tz->_bit32.timecnt;
753 0 : tmp->_bit32.typecnt = tz->_bit32.typecnt;
754 0 : tmp->_bit32.charcnt = tz->_bit32.charcnt;
755 0 : tmp->bit64.ttisgmtcnt = tz->bit64.ttisgmtcnt;
756 0 : tmp->bit64.ttisstdcnt = tz->bit64.ttisstdcnt;
757 0 : tmp->bit64.leapcnt = tz->bit64.leapcnt;
758 0 : tmp->bit64.timecnt = tz->bit64.timecnt;
759 0 : tmp->bit64.typecnt = tz->bit64.typecnt;
760 0 : tmp->bit64.charcnt = tz->bit64.charcnt;
761 :
762 0 : if (tz->bit64.timecnt) {
763 0 : tmp->trans = (int64_t *) timelib_malloc(tz->bit64.timecnt * sizeof(int64_t));
764 0 : tmp->trans_idx = (unsigned char*) timelib_malloc(tz->bit64.timecnt * sizeof(unsigned char));
765 0 : memcpy(tmp->trans, tz->trans, tz->bit64.timecnt * sizeof(int64_t));
766 0 : memcpy(tmp->trans_idx, tz->trans_idx, tz->bit64.timecnt * sizeof(unsigned char));
767 : }
768 :
769 0 : tmp->type = (ttinfo*) timelib_malloc(tz->bit64.typecnt * sizeof(ttinfo));
770 0 : memcpy(tmp->type, tz->type, tz->bit64.typecnt * sizeof(ttinfo));
771 :
772 0 : tmp->timezone_abbr = (char*) timelib_malloc(tz->bit64.charcnt);
773 0 : memcpy(tmp->timezone_abbr, tz->timezone_abbr, tz->bit64.charcnt);
774 :
775 0 : if (tz->bit64.leapcnt) {
776 0 : tmp->leap_times = (tlinfo*) timelib_malloc(tz->bit64.leapcnt * sizeof(tlinfo));
777 0 : memcpy(tmp->leap_times, tz->leap_times, tz->bit64.leapcnt * sizeof(tlinfo));
778 : }
779 :
780 0 : if (tz->posix_string) {
781 0 : tmp->posix_string = timelib_strdup(tz->posix_string);
782 : }
783 :
784 0 : return tmp;
785 : }
786 :
787 : /**
788 : * Algorithm From RFC 8536, Section 3.2
789 : * https://tools.ietf.org/html/rfc8536#section-3.2
790 : */
791 1320 : ttinfo* timelib_fetch_timezone_offset(timelib_tzinfo *tz, timelib_sll ts, timelib_sll *transition_time)
792 : {
793 : uint32_t left, right;
794 :
795 : /* RFC 8536: If there are no transitions, local time for all timestamps is specified
796 : * by the TZ string in the footer if present and nonempty; otherwise, it is specified
797 : * by time type 0.
798 : *
799 : * timelib: If there is also no time type 0, return NULL.
800 : */
801 1320 : if (!tz->bit64.timecnt || !tz->trans) {
802 1176 : if (tz->posix_info) {
803 1176 : *transition_time = INT64_MIN;
804 1176 : return timelib_fetch_posix_timezone_offset(tz, ts, NULL);
805 : }
806 :
807 0 : if (tz->bit64.typecnt == 1) {
808 0 : *transition_time = INT64_MIN;
809 0 : return &(tz->type[0]);
810 : }
811 0 : return NULL;
812 : }
813 :
814 : /* RFC 8536: Local time for timestamps before the first transition is specified by
815 : * the first time type (time type 0). */
816 144 : if (ts < tz->trans[0]) {
817 0 : *transition_time = INT64_MIN;
818 0 : return &(tz->type[0]);
819 : }
820 :
821 : /* RFC 8536: Local time for timestamps on or after the last transition is specified
822 : * by the TZ string in the footer (Section 3.3) if present and nonempty; otherwise,
823 : * it is unspecified.
824 : *
825 : * timelib: For 'unspecified', timelib assumes the last transition
826 : */
827 144 : if (ts >= tz->trans[tz->bit64.timecnt - 1]) {
828 144 : if (tz->posix_info) {
829 144 : return timelib_fetch_posix_timezone_offset(tz, ts, transition_time);
830 : }
831 :
832 0 : *transition_time = tz->trans[tz->bit64.timecnt - 1];
833 0 : return &(tz->type[tz->trans_idx[tz->bit64.timecnt - 1]]);
834 : }
835 :
836 : /* RFC 8536: The type corresponding to a transition time specifies local time for
837 : * timestamps starting at the given transition time and continuing up to, but not
838 : * including, the next transition time. */
839 0 : left = 0;
840 0 : right = tz->bit64.timecnt - 1;
841 :
842 0 : while (right - left > 1) {
843 0 : uint32_t mid = (left + right) >> 1;
844 :
845 0 : if (ts < tz->trans[mid]) {
846 0 : right = mid;
847 : } else {
848 0 : left = mid;
849 : }
850 : }
851 0 : *transition_time = tz->trans[left];
852 0 : return &(tz->type[tz->trans_idx[left]]);
853 : }
854 :
855 512 : static tlinfo* fetch_leaptime_offset(timelib_tzinfo *tz, timelib_sll ts)
856 : {
857 : int i;
858 :
859 512 : if (!tz->bit64.leapcnt || !tz->leap_times) {
860 512 : return NULL;
861 : }
862 :
863 0 : for (i = tz->bit64.leapcnt - 1; i > 0; i--) {
864 0 : if (ts > tz->leap_times[i].trans) {
865 0 : return &(tz->leap_times[i]);
866 : }
867 : }
868 0 : return NULL;
869 : }
870 :
871 0 : int timelib_timestamp_is_in_dst(timelib_sll ts, timelib_tzinfo *tz)
872 : {
873 : ttinfo *to;
874 : timelib_sll dummy;
875 :
876 0 : if ((to = timelib_fetch_timezone_offset(tz, ts, &dummy))) {
877 0 : return to->isdst;
878 : }
879 0 : return -1;
880 : }
881 :
882 512 : timelib_time_offset *timelib_get_time_zone_info(timelib_sll ts, timelib_tzinfo *tz)
883 : {
884 : ttinfo *to;
885 : tlinfo *tl;
886 512 : int32_t offset = 0, leap_secs = 0;
887 : char *abbr;
888 512 : timelib_time_offset *tmp = timelib_time_offset_ctor();
889 : timelib_sll transition_time;
890 :
891 512 : if ((to = timelib_fetch_timezone_offset(tz, ts, &transition_time))) {
892 512 : offset = to->offset;
893 512 : abbr = &(tz->timezone_abbr[to->abbr_idx]);
894 512 : tmp->is_dst = to->isdst;
895 512 : tmp->transition_time = transition_time;
896 : } else {
897 0 : offset = 0;
898 0 : abbr = tz->timezone_abbr;
899 0 : tmp->is_dst = 0;
900 0 : tmp->transition_time = 0;
901 : }
902 :
903 512 : if ((tl = fetch_leaptime_offset(tz, ts))) {
904 0 : leap_secs = -tl->offset;
905 : }
906 :
907 512 : tmp->offset = offset;
908 512 : tmp->leap_secs = leap_secs;
909 512 : tmp->abbr = abbr ? timelib_strdup(abbr) : timelib_strdup("GMT");
910 :
911 512 : return tmp;
912 : }
913 :
914 808 : int timelib_get_time_zone_offset_info(timelib_sll ts, timelib_tzinfo *tz, int32_t* offset, timelib_sll* transition_time, unsigned int* is_dst)
915 : {
916 : ttinfo *to;
917 : timelib_sll tmp_transition_time;
918 :
919 808 : if (tz == NULL) {
920 0 : return 0;
921 : }
922 :
923 808 : if ((to = timelib_fetch_timezone_offset(tz, ts, &tmp_transition_time))) {
924 808 : if (offset) {
925 808 : *offset = to->offset;
926 : }
927 808 : if (is_dst) {
928 340 : *is_dst = to->isdst;
929 : }
930 808 : if (transition_time) {
931 680 : *transition_time = tmp_transition_time;
932 : }
933 808 : return 1;
934 : }
935 0 : return 0;
936 : }
937 :
938 0 : timelib_sll timelib_get_current_offset(timelib_time *t)
939 : {
940 0 : switch (t->zone_type) {
941 0 : case TIMELIB_ZONETYPE_ABBR:
942 : case TIMELIB_ZONETYPE_OFFSET:
943 0 : return t->z + (t->dst * 3600);
944 :
945 0 : case TIMELIB_ZONETYPE_ID: {
946 0 : int32_t offset = 0;
947 0 : timelib_get_time_zone_offset_info(t->sse, t->tz_info, &offset, NULL, NULL);
948 0 : return offset;
949 : }
950 :
951 0 : default:
952 0 : return 0;
953 : }
954 : }
955 :
956 0 : int timelib_same_timezone(timelib_time *one, timelib_time *two)
957 : {
958 0 : if (one->zone_type != two->zone_type) {
959 0 : return 0;
960 : }
961 :
962 0 : if (one->zone_type == TIMELIB_ZONETYPE_ABBR || one->zone_type == TIMELIB_ZONETYPE_OFFSET) {
963 0 : if ((one->z + (one->dst * 3600)) == (two->z + (two->dst * 3600))) {
964 0 : return 1;
965 : }
966 0 : return 0;
967 : }
968 :
969 0 : if (one->zone_type == TIMELIB_ZONETYPE_ID && strcmp(one->tz_info->name, two->tz_info->name) == 0) {
970 0 : return 1;
971 : }
972 :
973 0 : return 0;
974 : }
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