1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2007-2016, International Business Machines Corporation and
6 * others. All Rights Reserved.
7 *******************************************************************************
8 */
9
10 #include "utypeinfo.h" // for 'typeid' to work
11
12 #include "unicode/utypes.h"
13
14 #if !UCONFIG_NO_FORMATTING
15
16 #include "unicode/vtzone.h"
17 #include "unicode/rbtz.h"
18 #include "unicode/ucal.h"
19 #include "unicode/ures.h"
20 #include "cmemory.h"
21 #include "uvector.h"
22 #include "gregoimp.h"
23 #include "uassert.h"
24
25 U_NAMESPACE_BEGIN
26
27 // This is the deleter that will be use to remove TimeZoneRule
28 U_CDECL_BEGIN
29 static void U_CALLCONV
deleteTimeZoneRule(void * obj)30 deleteTimeZoneRule(void* obj) {
31 delete (TimeZoneRule*) obj;
32 }
33 U_CDECL_END
34
35 // Smybol characters used by RFC2445 VTIMEZONE
36 static const UChar COLON = 0x3A; /* : */
37 static const UChar SEMICOLON = 0x3B; /* ; */
38 static const UChar EQUALS_SIGN = 0x3D; /* = */
39 static const UChar COMMA = 0x2C; /* , */
40 static const UChar PLUS = 0x2B; /* + */
41 static const UChar MINUS = 0x2D; /* - */
42
43 // RFC2445 VTIMEZONE tokens
44 static const UChar ICAL_BEGIN_VTIMEZONE[] = {0x42, 0x45, 0x47, 0x49, 0x4E, 0x3A, 0x56, 0x54, 0x49, 0x4D, 0x45, 0x5A, 0x4F, 0x4E, 0x45, 0}; /* "BEGIN:VTIMEZONE" */
45 static const UChar ICAL_END_VTIMEZONE[] = {0x45, 0x4E, 0x44, 0x3A, 0x56, 0x54, 0x49, 0x4D, 0x45, 0x5A, 0x4F, 0x4E, 0x45, 0}; /* "END:VTIMEZONE" */
46 static const UChar ICAL_BEGIN[] = {0x42, 0x45, 0x47, 0x49, 0x4E, 0}; /* "BEGIN" */
47 static const UChar ICAL_END[] = {0x45, 0x4E, 0x44, 0}; /* "END" */
48 static const UChar ICAL_VTIMEZONE[] = {0x56, 0x54, 0x49, 0x4D, 0x45, 0x5A, 0x4F, 0x4E, 0x45, 0}; /* "VTIMEZONE" */
49 static const UChar ICAL_TZID[] = {0x54, 0x5A, 0x49, 0x44, 0}; /* "TZID" */
50 static const UChar ICAL_STANDARD[] = {0x53, 0x54, 0x41, 0x4E, 0x44, 0x41, 0x52, 0x44, 0}; /* "STANDARD" */
51 static const UChar ICAL_DAYLIGHT[] = {0x44, 0x41, 0x59, 0x4C, 0x49, 0x47, 0x48, 0x54, 0}; /* "DAYLIGHT" */
52 static const UChar ICAL_DTSTART[] = {0x44, 0x54, 0x53, 0x54, 0x41, 0x52, 0x54, 0}; /* "DTSTART" */
53 static const UChar ICAL_TZOFFSETFROM[] = {0x54, 0x5A, 0x4F, 0x46, 0x46, 0x53, 0x45, 0x54, 0x46, 0x52, 0x4F, 0x4D, 0}; /* "TZOFFSETFROM" */
54 static const UChar ICAL_TZOFFSETTO[] = {0x54, 0x5A, 0x4F, 0x46, 0x46, 0x53, 0x45, 0x54, 0x54, 0x4F, 0}; /* "TZOFFSETTO" */
55 static const UChar ICAL_RDATE[] = {0x52, 0x44, 0x41, 0x54, 0x45, 0}; /* "RDATE" */
56 static const UChar ICAL_RRULE[] = {0x52, 0x52, 0x55, 0x4C, 0x45, 0}; /* "RRULE" */
57 static const UChar ICAL_TZNAME[] = {0x54, 0x5A, 0x4E, 0x41, 0x4D, 0x45, 0}; /* "TZNAME" */
58 static const UChar ICAL_TZURL[] = {0x54, 0x5A, 0x55, 0x52, 0x4C, 0}; /* "TZURL" */
59 static const UChar ICAL_LASTMOD[] = {0x4C, 0x41, 0x53, 0x54, 0x2D, 0x4D, 0x4F, 0x44, 0x49, 0x46, 0x49, 0x45, 0x44, 0}; /* "LAST-MODIFIED" */
60
61 static const UChar ICAL_FREQ[] = {0x46, 0x52, 0x45, 0x51, 0}; /* "FREQ" */
62 static const UChar ICAL_UNTIL[] = {0x55, 0x4E, 0x54, 0x49, 0x4C, 0}; /* "UNTIL" */
63 static const UChar ICAL_YEARLY[] = {0x59, 0x45, 0x41, 0x52, 0x4C, 0x59, 0}; /* "YEARLY" */
64 static const UChar ICAL_BYMONTH[] = {0x42, 0x59, 0x4D, 0x4F, 0x4E, 0x54, 0x48, 0}; /* "BYMONTH" */
65 static const UChar ICAL_BYDAY[] = {0x42, 0x59, 0x44, 0x41, 0x59, 0}; /* "BYDAY" */
66 static const UChar ICAL_BYMONTHDAY[] = {0x42, 0x59, 0x4D, 0x4F, 0x4E, 0x54, 0x48, 0x44, 0x41, 0x59, 0}; /* "BYMONTHDAY" */
67
68 static const UChar ICAL_NEWLINE[] = {0x0D, 0x0A, 0}; /* CRLF */
69
70 static const UChar ICAL_DOW_NAMES[7][3] = {
71 {0x53, 0x55, 0}, /* "SU" */
72 {0x4D, 0x4F, 0}, /* "MO" */
73 {0x54, 0x55, 0}, /* "TU" */
74 {0x57, 0x45, 0}, /* "WE" */
75 {0x54, 0x48, 0}, /* "TH" */
76 {0x46, 0x52, 0}, /* "FR" */
77 {0x53, 0x41, 0} /* "SA" */};
78
79 // Month length for non-leap year
80 static const int32_t MONTHLENGTH[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
81
82 // ICU custom property
83 static const UChar ICU_TZINFO_PROP[] = {0x58, 0x2D, 0x54, 0x5A, 0x49, 0x4E, 0x46, 0x4F, 0x3A, 0}; /* "X-TZINFO:" */
84 static const UChar ICU_TZINFO_PARTIAL[] = {0x2F, 0x50, 0x61, 0x72, 0x74, 0x69, 0x61, 0x6C, 0x40, 0}; /* "/Partial@" */
85 static const UChar ICU_TZINFO_SIMPLE[] = {0x2F, 0x53, 0x69, 0x6D, 0x70, 0x6C, 0x65, 0x40, 0}; /* "/Simple@" */
86
87
88 /*
89 * Simple fixed digit ASCII number to integer converter
90 */
parseAsciiDigits(const UnicodeString & str,int32_t start,int32_t length,UErrorCode & status)91 static int32_t parseAsciiDigits(const UnicodeString& str, int32_t start, int32_t length, UErrorCode& status) {
92 if (U_FAILURE(status)) {
93 return 0;
94 }
95 if (length <= 0 || str.length() < start || (start + length) > str.length()) {
96 status = U_INVALID_FORMAT_ERROR;
97 return 0;
98 }
99 int32_t sign = 1;
100 if (str.charAt(start) == PLUS) {
101 start++;
102 length--;
103 } else if (str.charAt(start) == MINUS) {
104 sign = -1;
105 start++;
106 length--;
107 }
108 int32_t num = 0;
109 for (int32_t i = 0; i < length; i++) {
110 int32_t digit = str.charAt(start + i) - 0x0030;
111 if (digit < 0 || digit > 9) {
112 status = U_INVALID_FORMAT_ERROR;
113 return 0;
114 }
115 num = 10 * num + digit;
116 }
117 return sign * num;
118 }
119
appendAsciiDigits(int32_t number,uint8_t length,UnicodeString & str)120 static UnicodeString& appendAsciiDigits(int32_t number, uint8_t length, UnicodeString& str) {
121 UBool negative = FALSE;
122 int32_t digits[10]; // max int32_t is 10 decimal digits
123 int32_t i;
124
125 if (number < 0) {
126 negative = TRUE;
127 number *= -1;
128 }
129
130 length = length > 10 ? 10 : length;
131 if (length == 0) {
132 // variable length
133 i = 0;
134 do {
135 digits[i++] = number % 10;
136 number /= 10;
137 } while (number != 0);
138 length = static_cast<uint8_t>(i);
139 } else {
140 // fixed digits
141 for (i = 0; i < length; i++) {
142 digits[i] = number % 10;
143 number /= 10;
144 }
145 }
146 if (negative) {
147 str.append(MINUS);
148 }
149 for (i = length - 1; i >= 0; i--) {
150 str.append((UChar)(digits[i] + 0x0030));
151 }
152 return str;
153 }
154
appendMillis(UDate date,UnicodeString & str)155 static UnicodeString& appendMillis(UDate date, UnicodeString& str) {
156 UBool negative = FALSE;
157 int32_t digits[20]; // max int64_t is 20 decimal digits
158 int32_t i;
159 int64_t number;
160
161 if (date < MIN_MILLIS) {
162 number = (int64_t)MIN_MILLIS;
163 } else if (date > MAX_MILLIS) {
164 number = (int64_t)MAX_MILLIS;
165 } else {
166 number = (int64_t)date;
167 }
168 if (number < 0) {
169 negative = TRUE;
170 number *= -1;
171 }
172 i = 0;
173 do {
174 digits[i++] = (int32_t)(number % 10);
175 number /= 10;
176 } while (number != 0);
177
178 if (negative) {
179 str.append(MINUS);
180 }
181 i--;
182 while (i >= 0) {
183 str.append((UChar)(digits[i--] + 0x0030));
184 }
185 return str;
186 }
187
188 /*
189 * Convert date/time to RFC2445 Date-Time form #1 DATE WITH LOCAL TIME
190 */
getDateTimeString(UDate time,UnicodeString & str)191 static UnicodeString& getDateTimeString(UDate time, UnicodeString& str) {
192 int32_t year, month, dom, dow, doy, mid;
193 Grego::timeToFields(time, year, month, dom, dow, doy, mid);
194
195 str.remove();
196 appendAsciiDigits(year, 4, str);
197 appendAsciiDigits(month + 1, 2, str);
198 appendAsciiDigits(dom, 2, str);
199 str.append((UChar)0x0054 /*'T'*/);
200
201 int32_t t = mid;
202 int32_t hour = t / U_MILLIS_PER_HOUR;
203 t %= U_MILLIS_PER_HOUR;
204 int32_t min = t / U_MILLIS_PER_MINUTE;
205 t %= U_MILLIS_PER_MINUTE;
206 int32_t sec = t / U_MILLIS_PER_SECOND;
207
208 appendAsciiDigits(hour, 2, str);
209 appendAsciiDigits(min, 2, str);
210 appendAsciiDigits(sec, 2, str);
211 return str;
212 }
213
214 /*
215 * Convert date/time to RFC2445 Date-Time form #2 DATE WITH UTC TIME
216 */
getUTCDateTimeString(UDate time,UnicodeString & str)217 static UnicodeString& getUTCDateTimeString(UDate time, UnicodeString& str) {
218 getDateTimeString(time, str);
219 str.append((UChar)0x005A /*'Z'*/);
220 return str;
221 }
222
223 /*
224 * Parse RFC2445 Date-Time form #1 DATE WITH LOCAL TIME and
225 * #2 DATE WITH UTC TIME
226 */
parseDateTimeString(const UnicodeString & str,int32_t offset,UErrorCode & status)227 static UDate parseDateTimeString(const UnicodeString& str, int32_t offset, UErrorCode& status) {
228 if (U_FAILURE(status)) {
229 return 0.0;
230 }
231
232 int32_t year = 0, month = 0, day = 0, hour = 0, min = 0, sec = 0;
233 UBool isUTC = FALSE;
234 UBool isValid = FALSE;
235 do {
236 int length = str.length();
237 if (length != 15 && length != 16) {
238 // FORM#1 15 characters, such as "20060317T142115"
239 // FORM#2 16 characters, such as "20060317T142115Z"
240 break;
241 }
242 if (str.charAt(8) != 0x0054) {
243 // charcter "T" must be used for separating date and time
244 break;
245 }
246 if (length == 16) {
247 if (str.charAt(15) != 0x005A) {
248 // invalid format
249 break;
250 }
251 isUTC = TRUE;
252 }
253
254 year = parseAsciiDigits(str, 0, 4, status);
255 month = parseAsciiDigits(str, 4, 2, status) - 1; // 0-based
256 day = parseAsciiDigits(str, 6, 2, status);
257 hour = parseAsciiDigits(str, 9, 2, status);
258 min = parseAsciiDigits(str, 11, 2, status);
259 sec = parseAsciiDigits(str, 13, 2, status);
260
261 if (U_FAILURE(status)) {
262 break;
263 }
264
265 // check valid range
266 int32_t maxDayOfMonth = Grego::monthLength(year, month);
267 if (year < 0 || month < 0 || month > 11 || day < 1 || day > maxDayOfMonth ||
268 hour < 0 || hour >= 24 || min < 0 || min >= 60 || sec < 0 || sec >= 60) {
269 break;
270 }
271
272 isValid = TRUE;
273 } while(false);
274
275 if (!isValid) {
276 status = U_INVALID_FORMAT_ERROR;
277 return 0.0;
278 }
279 // Calculate the time
280 UDate time = Grego::fieldsToDay(year, month, day) * U_MILLIS_PER_DAY;
281 time += (hour * U_MILLIS_PER_HOUR + min * U_MILLIS_PER_MINUTE + sec * U_MILLIS_PER_SECOND);
282 if (!isUTC) {
283 time -= offset;
284 }
285 return time;
286 }
287
288 /*
289 * Convert RFC2445 utc-offset string to milliseconds
290 */
offsetStrToMillis(const UnicodeString & str,UErrorCode & status)291 static int32_t offsetStrToMillis(const UnicodeString& str, UErrorCode& status) {
292 if (U_FAILURE(status)) {
293 return 0;
294 }
295
296 UBool isValid = FALSE;
297 int32_t sign = 0, hour = 0, min = 0, sec = 0;
298
299 do {
300 int length = str.length();
301 if (length != 5 && length != 7) {
302 // utf-offset must be 5 or 7 characters
303 break;
304 }
305 // sign
306 UChar s = str.charAt(0);
307 if (s == PLUS) {
308 sign = 1;
309 } else if (s == MINUS) {
310 sign = -1;
311 } else {
312 // utf-offset must start with "+" or "-"
313 break;
314 }
315 hour = parseAsciiDigits(str, 1, 2, status);
316 min = parseAsciiDigits(str, 3, 2, status);
317 if (length == 7) {
318 sec = parseAsciiDigits(str, 5, 2, status);
319 }
320 if (U_FAILURE(status)) {
321 break;
322 }
323 isValid = true;
324 } while(false);
325
326 if (!isValid) {
327 status = U_INVALID_FORMAT_ERROR;
328 return 0;
329 }
330 int32_t millis = sign * ((hour * 60 + min) * 60 + sec) * 1000;
331 return millis;
332 }
333
334 /*
335 * Convert milliseconds to RFC2445 utc-offset string
336 */
millisToOffset(int32_t millis,UnicodeString & str)337 static void millisToOffset(int32_t millis, UnicodeString& str) {
338 str.remove();
339 if (millis >= 0) {
340 str.append(PLUS);
341 } else {
342 str.append(MINUS);
343 millis = -millis;
344 }
345 int32_t hour, min, sec;
346 int32_t t = millis / 1000;
347
348 sec = t % 60;
349 t = (t - sec) / 60;
350 min = t % 60;
351 hour = t / 60;
352
353 appendAsciiDigits(hour, 2, str);
354 appendAsciiDigits(min, 2, str);
355 appendAsciiDigits(sec, 2, str);
356 }
357
358 /*
359 * Create a default TZNAME from TZID
360 */
getDefaultTZName(const UnicodeString & tzid,UBool isDST,UnicodeString & zonename)361 static void getDefaultTZName(const UnicodeString &tzid, UBool isDST, UnicodeString& zonename) {
362 zonename = tzid;
363 if (isDST) {
364 zonename += UNICODE_STRING_SIMPLE("(DST)");
365 } else {
366 zonename += UNICODE_STRING_SIMPLE("(STD)");
367 }
368 }
369
370 /*
371 * Parse individual RRULE
372 *
373 * On return -
374 *
375 * month calculated by BYMONTH-1, or -1 when not found
376 * dow day of week in BYDAY, or 0 when not found
377 * wim day of week ordinal number in BYDAY, or 0 when not found
378 * dom an array of day of month
379 * domCount number of availble days in dom (domCount is specifying the size of dom on input)
380 * until time defined by UNTIL attribute or MIN_MILLIS if not available
381 */
parseRRULE(const UnicodeString & rrule,int32_t & month,int32_t & dow,int32_t & wim,int32_t * dom,int32_t & domCount,UDate & until,UErrorCode & status)382 static void parseRRULE(const UnicodeString& rrule, int32_t& month, int32_t& dow, int32_t& wim,
383 int32_t* dom, int32_t& domCount, UDate& until, UErrorCode& status) {
384 if (U_FAILURE(status)) {
385 return;
386 }
387 int32_t numDom = 0;
388
389 month = -1;
390 dow = 0;
391 wim = 0;
392 until = MIN_MILLIS;
393
394 UBool yearly = FALSE;
395 //UBool parseError = FALSE;
396
397 int32_t prop_start = 0;
398 int32_t prop_end;
399 UnicodeString prop, attr, value;
400 UBool nextProp = TRUE;
401
402 while (nextProp) {
403 prop_end = rrule.indexOf(SEMICOLON, prop_start);
404 if (prop_end == -1) {
405 prop.setTo(rrule, prop_start);
406 nextProp = FALSE;
407 } else {
408 prop.setTo(rrule, prop_start, prop_end - prop_start);
409 prop_start = prop_end + 1;
410 }
411 int32_t eql = prop.indexOf(EQUALS_SIGN);
412 if (eql != -1) {
413 attr.setTo(prop, 0, eql);
414 value.setTo(prop, eql + 1);
415 } else {
416 goto rruleParseError;
417 }
418
419 if (attr.compare(ICAL_FREQ, -1) == 0) {
420 // only support YEARLY frequency type
421 if (value.compare(ICAL_YEARLY, -1) == 0) {
422 yearly = TRUE;
423 } else {
424 goto rruleParseError;
425 }
426 } else if (attr.compare(ICAL_UNTIL, -1) == 0) {
427 // ISO8601 UTC format, for example, "20060315T020000Z"
428 until = parseDateTimeString(value, 0, status);
429 if (U_FAILURE(status)) {
430 goto rruleParseError;
431 }
432 } else if (attr.compare(ICAL_BYMONTH, -1) == 0) {
433 // Note: BYMONTH may contain multiple months, but only single month make sense for
434 // VTIMEZONE property.
435 if (value.length() > 2) {
436 goto rruleParseError;
437 }
438 month = parseAsciiDigits(value, 0, value.length(), status) - 1;
439 if (U_FAILURE(status) || month < 0 || month >= 12) {
440 goto rruleParseError;
441 }
442 } else if (attr.compare(ICAL_BYDAY, -1) == 0) {
443 // Note: BYDAY may contain multiple day of week separated by comma. It is unlikely used for
444 // VTIMEZONE property. We do not support the case.
445
446 // 2-letter format is used just for representing a day of week, for example, "SU" for Sunday
447 // 3 or 4-letter format is used for represeinging Nth day of week, for example, "-1SA" for last Saturday
448 int32_t length = value.length();
449 if (length < 2 || length > 4) {
450 goto rruleParseError;
451 }
452 if (length > 2) {
453 // Nth day of week
454 int32_t sign = 1;
455 if (value.charAt(0) == PLUS) {
456 sign = 1;
457 } else if (value.charAt(0) == MINUS) {
458 sign = -1;
459 } else if (length == 4) {
460 goto rruleParseError;
461 }
462 int32_t n = parseAsciiDigits(value, length - 3, 1, status);
463 if (U_FAILURE(status) || n == 0 || n > 4) {
464 goto rruleParseError;
465 }
466 wim = n * sign;
467 value.remove(0, length - 2);
468 }
469 int32_t wday;
470 for (wday = 0; wday < 7; wday++) {
471 if (value.compare(ICAL_DOW_NAMES[wday], 2) == 0) {
472 break;
473 }
474 }
475 if (wday < 7) {
476 // Sunday(1) - Saturday(7)
477 dow = wday + 1;
478 } else {
479 goto rruleParseError;
480 }
481 } else if (attr.compare(ICAL_BYMONTHDAY, -1) == 0) {
482 // Note: BYMONTHDAY may contain multiple days delimitted by comma
483 //
484 // A value of BYMONTHDAY could be negative, for example, -1 means
485 // the last day in a month
486 int32_t dom_idx = 0;
487 int32_t dom_start = 0;
488 int32_t dom_end;
489 UBool nextDOM = TRUE;
490 while (nextDOM) {
491 dom_end = value.indexOf(COMMA, dom_start);
492 if (dom_end == -1) {
493 dom_end = value.length();
494 nextDOM = FALSE;
495 }
496 if (dom_idx < domCount) {
497 dom[dom_idx] = parseAsciiDigits(value, dom_start, dom_end - dom_start, status);
498 if (U_FAILURE(status)) {
499 goto rruleParseError;
500 }
501 dom_idx++;
502 } else {
503 status = U_BUFFER_OVERFLOW_ERROR;
504 goto rruleParseError;
505 }
506 dom_start = dom_end + 1;
507 }
508 numDom = dom_idx;
509 }
510 }
511 if (!yearly) {
512 // FREQ=YEARLY must be set
513 goto rruleParseError;
514 }
515 // Set actual number of parsed DOM (ICAL_BYMONTHDAY)
516 domCount = numDom;
517 return;
518
519 rruleParseError:
520 if (U_SUCCESS(status)) {
521 // Set error status
522 status = U_INVALID_FORMAT_ERROR;
523 }
524 }
525
createRuleByRRULE(const UnicodeString & zonename,int rawOffset,int dstSavings,UDate start,UVector * dates,int fromOffset,UErrorCode & status)526 static TimeZoneRule* createRuleByRRULE(const UnicodeString& zonename, int rawOffset, int dstSavings, UDate start,
527 UVector* dates, int fromOffset, UErrorCode& status) {
528 if (U_FAILURE(status)) {
529 return NULL;
530 }
531 if (dates == NULL || dates->size() == 0) {
532 status = U_ILLEGAL_ARGUMENT_ERROR;
533 return NULL;
534 }
535
536 int32_t i, j;
537 DateTimeRule *adtr = NULL;
538
539 // Parse the first rule
540 UnicodeString rrule = *((UnicodeString*)dates->elementAt(0));
541 int32_t month, dayOfWeek, nthDayOfWeek, dayOfMonth = 0;
542 int32_t days[7];
543 int32_t daysCount = UPRV_LENGTHOF(days);
544 UDate until;
545
546 parseRRULE(rrule, month, dayOfWeek, nthDayOfWeek, days, daysCount, until, status);
547 if (U_FAILURE(status)) {
548 return NULL;
549 }
550
551 if (dates->size() == 1) {
552 // No more rules
553 if (daysCount > 1) {
554 // Multiple BYMONTHDAY values
555 if (daysCount != 7 || month == -1 || dayOfWeek == 0) {
556 // Only support the rule using 7 continuous days
557 // BYMONTH and BYDAY must be set at the same time
558 goto unsupportedRRule;
559 }
560 int32_t firstDay = 31; // max possible number of dates in a month
561 for (i = 0; i < 7; i++) {
562 // Resolve negative day numbers. A negative day number should
563 // not be used in February, but if we see such case, we use 28
564 // as the base.
565 if (days[i] < 0) {
566 days[i] = MONTHLENGTH[month] + days[i] + 1;
567 }
568 if (days[i] < firstDay) {
569 firstDay = days[i];
570 }
571 }
572 // Make sure days are continuous
573 for (i = 1; i < 7; i++) {
574 UBool found = FALSE;
575 for (j = 0; j < 7; j++) {
576 if (days[j] == firstDay + i) {
577 found = TRUE;
578 break;
579 }
580 }
581 if (!found) {
582 // days are not continuous
583 goto unsupportedRRule;
584 }
585 }
586 // Use DOW_GEQ_DOM rule with firstDay as the start date
587 dayOfMonth = firstDay;
588 }
589 } else {
590 // Check if BYMONTH + BYMONTHDAY + BYDAY rule with multiple RRULE lines.
591 // Otherwise, not supported.
592 if (month == -1 || dayOfWeek == 0 || daysCount == 0) {
593 // This is not the case
594 goto unsupportedRRule;
595 }
596 // Parse the rest of rules if number of rules is not exceeding 7.
597 // We can only support 7 continuous days starting from a day of month.
598 if (dates->size() > 7) {
599 goto unsupportedRRule;
600 }
601
602 // Note: To check valid date range across multiple rule is a little
603 // bit complicated. For now, this code is not doing strict range
604 // checking across month boundary
605
606 int32_t earliestMonth = month;
607 int32_t earliestDay = 31;
608 for (i = 0; i < daysCount; i++) {
609 int32_t dom = days[i];
610 dom = dom > 0 ? dom : MONTHLENGTH[month] + dom + 1;
611 earliestDay = dom < earliestDay ? dom : earliestDay;
612 }
613
614 int32_t anotherMonth = -1;
615 for (i = 1; i < dates->size(); i++) {
616 rrule = *((UnicodeString*)dates->elementAt(i));
617 UDate tmp_until;
618 int32_t tmp_month, tmp_dayOfWeek, tmp_nthDayOfWeek;
619 int32_t tmp_days[7];
620 int32_t tmp_daysCount = UPRV_LENGTHOF(tmp_days);
621 parseRRULE(rrule, tmp_month, tmp_dayOfWeek, tmp_nthDayOfWeek, tmp_days, tmp_daysCount, tmp_until, status);
622 if (U_FAILURE(status)) {
623 return NULL;
624 }
625 // If UNTIL is newer than previous one, use the one
626 if (tmp_until > until) {
627 until = tmp_until;
628 }
629
630 // Check if BYMONTH + BYMONTHDAY + BYDAY rule
631 if (tmp_month == -1 || tmp_dayOfWeek == 0 || tmp_daysCount == 0) {
632 goto unsupportedRRule;
633 }
634 // Count number of BYMONTHDAY
635 if (daysCount + tmp_daysCount > 7) {
636 // We cannot support BYMONTHDAY more than 7
637 goto unsupportedRRule;
638 }
639 // Check if the same BYDAY is used. Otherwise, we cannot
640 // support the rule
641 if (tmp_dayOfWeek != dayOfWeek) {
642 goto unsupportedRRule;
643 }
644 // Check if the month is same or right next to the primary month
645 if (tmp_month != month) {
646 if (anotherMonth == -1) {
647 int32_t diff = tmp_month - month;
648 if (diff == -11 || diff == -1) {
649 // Previous month
650 anotherMonth = tmp_month;
651 earliestMonth = anotherMonth;
652 // Reset earliest day
653 earliestDay = 31;
654 } else if (diff == 11 || diff == 1) {
655 // Next month
656 anotherMonth = tmp_month;
657 } else {
658 // The day range cannot exceed more than 2 months
659 goto unsupportedRRule;
660 }
661 } else if (tmp_month != month && tmp_month != anotherMonth) {
662 // The day range cannot exceed more than 2 months
663 goto unsupportedRRule;
664 }
665 }
666 // If ealier month, go through days to find the earliest day
667 if (tmp_month == earliestMonth) {
668 for (j = 0; j < tmp_daysCount; j++) {
669 tmp_days[j] = tmp_days[j] > 0 ? tmp_days[j] : MONTHLENGTH[tmp_month] + tmp_days[j] + 1;
670 earliestDay = tmp_days[j] < earliestDay ? tmp_days[j] : earliestDay;
671 }
672 }
673 daysCount += tmp_daysCount;
674 }
675 if (daysCount != 7) {
676 // Number of BYMONTHDAY entries must be 7
677 goto unsupportedRRule;
678 }
679 month = earliestMonth;
680 dayOfMonth = earliestDay;
681 }
682
683 // Calculate start/end year and missing fields
684 int32_t startYear, startMonth, startDOM, startDOW, startDOY, startMID;
685 Grego::timeToFields(start + fromOffset, startYear, startMonth, startDOM,
686 startDOW, startDOY, startMID);
687 if (month == -1) {
688 // If BYMONTH is not set, use the month of DTSTART
689 month = startMonth;
690 }
691 if (dayOfWeek == 0 && nthDayOfWeek == 0 && dayOfMonth == 0) {
692 // If only YEARLY is set, use the day of DTSTART as BYMONTHDAY
693 dayOfMonth = startDOM;
694 }
695
696 int32_t endYear;
697 if (until != MIN_MILLIS) {
698 int32_t endMonth, endDOM, endDOW, endDOY, endMID;
699 Grego::timeToFields(until, endYear, endMonth, endDOM, endDOW, endDOY, endMID);
700 } else {
701 endYear = AnnualTimeZoneRule::MAX_YEAR;
702 }
703
704 // Create the AnnualDateTimeRule
705 if (dayOfWeek == 0 && nthDayOfWeek == 0 && dayOfMonth != 0) {
706 // Day in month rule, for example, 15th day in the month
707 adtr = new DateTimeRule(month, dayOfMonth, startMID, DateTimeRule::WALL_TIME);
708 } else if (dayOfWeek != 0 && nthDayOfWeek != 0 && dayOfMonth == 0) {
709 // Nth day of week rule, for example, last Sunday
710 adtr = new DateTimeRule(month, nthDayOfWeek, dayOfWeek, startMID, DateTimeRule::WALL_TIME);
711 } else if (dayOfWeek != 0 && nthDayOfWeek == 0 && dayOfMonth != 0) {
712 // First day of week after day of month rule, for example,
713 // first Sunday after 15th day in the month
714 adtr = new DateTimeRule(month, dayOfMonth, dayOfWeek, TRUE, startMID, DateTimeRule::WALL_TIME);
715 }
716 if (adtr == NULL) {
717 goto unsupportedRRule;
718 }
719 return new AnnualTimeZoneRule(zonename, rawOffset, dstSavings, adtr, startYear, endYear);
720
721 unsupportedRRule:
722 status = U_INVALID_STATE_ERROR;
723 return NULL;
724 }
725
726 /*
727 * Create a TimeZoneRule by the RDATE definition
728 */
createRuleByRDATE(const UnicodeString & zonename,int32_t rawOffset,int32_t dstSavings,UDate start,UVector * dates,int32_t fromOffset,UErrorCode & status)729 static TimeZoneRule* createRuleByRDATE(const UnicodeString& zonename, int32_t rawOffset, int32_t dstSavings,
730 UDate start, UVector* dates, int32_t fromOffset, UErrorCode& status) {
731 if (U_FAILURE(status)) {
732 return NULL;
733 }
734 TimeArrayTimeZoneRule *retVal = NULL;
735 if (dates == NULL || dates->size() == 0) {
736 // When no RDATE line is provided, use start (DTSTART)
737 // as the transition time
738 retVal = new TimeArrayTimeZoneRule(zonename, rawOffset, dstSavings,
739 &start, 1, DateTimeRule::UTC_TIME);
740 } else {
741 // Create an array of transition times
742 int32_t size = dates->size();
743 UDate* times = (UDate*)uprv_malloc(sizeof(UDate) * size);
744 if (times == NULL) {
745 status = U_MEMORY_ALLOCATION_ERROR;
746 return NULL;
747 }
748 for (int32_t i = 0; i < size; i++) {
749 UnicodeString *datestr = (UnicodeString*)dates->elementAt(i);
750 times[i] = parseDateTimeString(*datestr, fromOffset, status);
751 if (U_FAILURE(status)) {
752 uprv_free(times);
753 return NULL;
754 }
755 }
756 retVal = new TimeArrayTimeZoneRule(zonename, rawOffset, dstSavings,
757 times, size, DateTimeRule::UTC_TIME);
758 uprv_free(times);
759 }
760 return retVal;
761 }
762
763 /*
764 * Check if the DOW rule specified by month, weekInMonth and dayOfWeek is equivalent
765 * to the DateTimerule.
766 */
isEquivalentDateRule(int32_t month,int32_t weekInMonth,int32_t dayOfWeek,const DateTimeRule * dtrule)767 static UBool isEquivalentDateRule(int32_t month, int32_t weekInMonth, int32_t dayOfWeek, const DateTimeRule *dtrule) {
768 if (month != dtrule->getRuleMonth() || dayOfWeek != dtrule->getRuleDayOfWeek()) {
769 return FALSE;
770 }
771 if (dtrule->getTimeRuleType() != DateTimeRule::WALL_TIME) {
772 // Do not try to do more intelligent comparison for now.
773 return FALSE;
774 }
775 if (dtrule->getDateRuleType() == DateTimeRule::DOW
776 && dtrule->getRuleWeekInMonth() == weekInMonth) {
777 return TRUE;
778 }
779 int32_t ruleDOM = dtrule->getRuleDayOfMonth();
780 if (dtrule->getDateRuleType() == DateTimeRule::DOW_GEQ_DOM) {
781 if (ruleDOM%7 == 1 && (ruleDOM + 6)/7 == weekInMonth) {
782 return TRUE;
783 }
784 if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - ruleDOM)%7 == 6
785 && weekInMonth == -1*((MONTHLENGTH[month]-ruleDOM+1)/7)) {
786 return TRUE;
787 }
788 }
789 if (dtrule->getDateRuleType() == DateTimeRule::DOW_LEQ_DOM) {
790 if (ruleDOM%7 == 0 && ruleDOM/7 == weekInMonth) {
791 return TRUE;
792 }
793 if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - ruleDOM)%7 == 0
794 && weekInMonth == -1*((MONTHLENGTH[month] - ruleDOM)/7 + 1)) {
795 return TRUE;
796 }
797 }
798 return FALSE;
799 }
800
801 /*
802 * Convert the rule to its equivalent rule using WALL_TIME mode.
803 * This function returns NULL when the specified DateTimeRule is already
804 * using WALL_TIME mode.
805 */
toWallTimeRule(const DateTimeRule * rule,int32_t rawOffset,int32_t dstSavings)806 static DateTimeRule* toWallTimeRule(const DateTimeRule* rule, int32_t rawOffset, int32_t dstSavings) {
807 if (rule->getTimeRuleType() == DateTimeRule::WALL_TIME) {
808 return NULL;
809 }
810 int32_t wallt = rule->getRuleMillisInDay();
811 if (rule->getTimeRuleType() == DateTimeRule::UTC_TIME) {
812 wallt += (rawOffset + dstSavings);
813 } else if (rule->getTimeRuleType() == DateTimeRule::STANDARD_TIME) {
814 wallt += dstSavings;
815 }
816
817 int32_t month = -1, dom = 0, dow = 0;
818 DateTimeRule::DateRuleType dtype;
819 int32_t dshift = 0;
820 if (wallt < 0) {
821 dshift = -1;
822 wallt += U_MILLIS_PER_DAY;
823 } else if (wallt >= U_MILLIS_PER_DAY) {
824 dshift = 1;
825 wallt -= U_MILLIS_PER_DAY;
826 }
827
828 month = rule->getRuleMonth();
829 dom = rule->getRuleDayOfMonth();
830 dow = rule->getRuleDayOfWeek();
831 dtype = rule->getDateRuleType();
832
833 if (dshift != 0) {
834 if (dtype == DateTimeRule::DOW) {
835 // Convert to DOW_GEW_DOM or DOW_LEQ_DOM rule first
836 int32_t wim = rule->getRuleWeekInMonth();
837 if (wim > 0) {
838 dtype = DateTimeRule::DOW_GEQ_DOM;
839 dom = 7 * (wim - 1) + 1;
840 } else {
841 dtype = DateTimeRule::DOW_LEQ_DOM;
842 dom = MONTHLENGTH[month] + 7 * (wim + 1);
843 }
844 }
845 // Shift one day before or after
846 dom += dshift;
847 if (dom == 0) {
848 month--;
849 month = month < UCAL_JANUARY ? UCAL_DECEMBER : month;
850 dom = MONTHLENGTH[month];
851 } else if (dom > MONTHLENGTH[month]) {
852 month++;
853 month = month > UCAL_DECEMBER ? UCAL_JANUARY : month;
854 dom = 1;
855 }
856 if (dtype != DateTimeRule::DOM) {
857 // Adjust day of week
858 dow += dshift;
859 if (dow < UCAL_SUNDAY) {
860 dow = UCAL_SATURDAY;
861 } else if (dow > UCAL_SATURDAY) {
862 dow = UCAL_SUNDAY;
863 }
864 }
865 }
866 // Create a new rule
867 DateTimeRule *modifiedRule;
868 if (dtype == DateTimeRule::DOM) {
869 modifiedRule = new DateTimeRule(month, dom, wallt, DateTimeRule::WALL_TIME);
870 } else {
871 modifiedRule = new DateTimeRule(month, dom, dow,
872 (dtype == DateTimeRule::DOW_GEQ_DOM), wallt, DateTimeRule::WALL_TIME);
873 }
874 return modifiedRule;
875 }
876
877 /*
878 * Minumum implementations of stream writer/reader, writing/reading
879 * UnicodeString. For now, we do not want to introduce the dependency
880 * on the ICU I/O stream in this module. But we want to keep the code
881 * equivalent to the ICU4J implementation, which utilizes java.io.Writer/
882 * Reader.
883 */
884 class VTZWriter {
885 public:
886 VTZWriter(UnicodeString& out);
887 ~VTZWriter();
888
889 void write(const UnicodeString& str);
890 void write(UChar ch);
891 void write(const UChar* str);
892 //void write(const UChar* str, int32_t length);
893 private:
894 UnicodeString* out;
895 };
896
VTZWriter(UnicodeString & output)897 VTZWriter::VTZWriter(UnicodeString& output) {
898 out = &output;
899 }
900
~VTZWriter()901 VTZWriter::~VTZWriter() {
902 }
903
904 void
write(const UnicodeString & str)905 VTZWriter::write(const UnicodeString& str) {
906 out->append(str);
907 }
908
909 void
write(UChar ch)910 VTZWriter::write(UChar ch) {
911 out->append(ch);
912 }
913
914 void
write(const UChar * str)915 VTZWriter::write(const UChar* str) {
916 out->append(str, -1);
917 }
918
919 /*
920 void
921 VTZWriter::write(const UChar* str, int32_t length) {
922 out->append(str, length);
923 }
924 */
925
926 class VTZReader {
927 public:
928 VTZReader(const UnicodeString& input);
929 ~VTZReader();
930
931 UChar read(void);
932 private:
933 const UnicodeString* in;
934 int32_t index;
935 };
936
VTZReader(const UnicodeString & input)937 VTZReader::VTZReader(const UnicodeString& input) {
938 in = &input;
939 index = 0;
940 }
941
~VTZReader()942 VTZReader::~VTZReader() {
943 }
944
945 UChar
read(void)946 VTZReader::read(void) {
947 UChar ch = 0xFFFF;
948 if (index < in->length()) {
949 ch = in->charAt(index);
950 }
951 index++;
952 return ch;
953 }
954
955
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(VTimeZone)956 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(VTimeZone)
957
958 VTimeZone::VTimeZone()
959 : BasicTimeZone(), tz(NULL), vtzlines(NULL),
960 lastmod(MAX_MILLIS) {
961 }
962
VTimeZone(const VTimeZone & source)963 VTimeZone::VTimeZone(const VTimeZone& source)
964 : BasicTimeZone(source), tz(NULL), vtzlines(NULL),
965 tzurl(source.tzurl), lastmod(source.lastmod),
966 olsonzid(source.olsonzid), icutzver(source.icutzver) {
967 if (source.tz != NULL) {
968 tz = source.tz->clone();
969 }
970 if (source.vtzlines != NULL) {
971 UErrorCode status = U_ZERO_ERROR;
972 int32_t size = source.vtzlines->size();
973 vtzlines = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, size, status);
974 if (U_SUCCESS(status)) {
975 for (int32_t i = 0; i < size; i++) {
976 UnicodeString *line = (UnicodeString*)source.vtzlines->elementAt(i);
977 vtzlines->addElement(line->clone(), status);
978 if (U_FAILURE(status)) {
979 break;
980 }
981 }
982 }
983 if (U_FAILURE(status) && vtzlines != NULL) {
984 delete vtzlines;
985 }
986 }
987 }
988
~VTimeZone()989 VTimeZone::~VTimeZone() {
990 if (tz != NULL) {
991 delete tz;
992 }
993 if (vtzlines != NULL) {
994 delete vtzlines;
995 }
996 }
997
998 VTimeZone&
operator =(const VTimeZone & right)999 VTimeZone::operator=(const VTimeZone& right) {
1000 if (this == &right) {
1001 return *this;
1002 }
1003 if (*this != right) {
1004 BasicTimeZone::operator=(right);
1005 if (tz != NULL) {
1006 delete tz;
1007 tz = NULL;
1008 }
1009 if (right.tz != NULL) {
1010 tz = right.tz->clone();
1011 }
1012 if (vtzlines != NULL) {
1013 delete vtzlines;
1014 }
1015 if (right.vtzlines != NULL) {
1016 UErrorCode status = U_ZERO_ERROR;
1017 int32_t size = right.vtzlines->size();
1018 vtzlines = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, size, status);
1019 if (U_SUCCESS(status)) {
1020 for (int32_t i = 0; i < size; i++) {
1021 UnicodeString *line = (UnicodeString*)right.vtzlines->elementAt(i);
1022 vtzlines->addElement(line->clone(), status);
1023 if (U_FAILURE(status)) {
1024 break;
1025 }
1026 }
1027 }
1028 if (U_FAILURE(status) && vtzlines != NULL) {
1029 delete vtzlines;
1030 vtzlines = NULL;
1031 }
1032 }
1033 tzurl = right.tzurl;
1034 lastmod = right.lastmod;
1035 olsonzid = right.olsonzid;
1036 icutzver = right.icutzver;
1037 }
1038 return *this;
1039 }
1040
1041 UBool
operator ==(const TimeZone & that) const1042 VTimeZone::operator==(const TimeZone& that) const {
1043 if (this == &that) {
1044 return TRUE;
1045 }
1046 if (typeid(*this) != typeid(that) || !BasicTimeZone::operator==(that)) {
1047 return FALSE;
1048 }
1049 VTimeZone *vtz = (VTimeZone*)&that;
1050 if (*tz == *(vtz->tz)
1051 && tzurl == vtz->tzurl
1052 && lastmod == vtz->lastmod
1053 /* && olsonzid = that.olsonzid */
1054 /* && icutzver = that.icutzver */) {
1055 return TRUE;
1056 }
1057 return FALSE;
1058 }
1059
1060 UBool
operator !=(const TimeZone & that) const1061 VTimeZone::operator!=(const TimeZone& that) const {
1062 return !operator==(that);
1063 }
1064
1065 VTimeZone*
createVTimeZoneByID(const UnicodeString & ID)1066 VTimeZone::createVTimeZoneByID(const UnicodeString& ID) {
1067 VTimeZone *vtz = new VTimeZone();
1068 vtz->tz = (BasicTimeZone*)TimeZone::createTimeZone(ID);
1069 vtz->tz->getID(vtz->olsonzid);
1070
1071 // Set ICU tzdata version
1072 UErrorCode status = U_ZERO_ERROR;
1073 UResourceBundle *bundle = NULL;
1074 const UChar* versionStr = NULL;
1075 int32_t len = 0;
1076 bundle = ures_openDirect(NULL, "zoneinfo64", &status);
1077 versionStr = ures_getStringByKey(bundle, "TZVersion", &len, &status);
1078 if (U_SUCCESS(status)) {
1079 vtz->icutzver.setTo(versionStr, len);
1080 }
1081 ures_close(bundle);
1082 return vtz;
1083 }
1084
1085 VTimeZone*
createVTimeZoneFromBasicTimeZone(const BasicTimeZone & basic_time_zone,UErrorCode & status)1086 VTimeZone::createVTimeZoneFromBasicTimeZone(const BasicTimeZone& basic_time_zone, UErrorCode &status) {
1087 if (U_FAILURE(status)) {
1088 return NULL;
1089 }
1090 VTimeZone *vtz = new VTimeZone();
1091 if (vtz == NULL) {
1092 status = U_MEMORY_ALLOCATION_ERROR;
1093 return NULL;
1094 }
1095 vtz->tz = basic_time_zone.clone();
1096 if (vtz->tz == NULL) {
1097 status = U_MEMORY_ALLOCATION_ERROR;
1098 delete vtz;
1099 return NULL;
1100 }
1101 vtz->tz->getID(vtz->olsonzid);
1102
1103 // Set ICU tzdata version
1104 UResourceBundle *bundle = NULL;
1105 const UChar* versionStr = NULL;
1106 int32_t len = 0;
1107 bundle = ures_openDirect(NULL, "zoneinfo64", &status);
1108 versionStr = ures_getStringByKey(bundle, "TZVersion", &len, &status);
1109 if (U_SUCCESS(status)) {
1110 vtz->icutzver.setTo(versionStr, len);
1111 }
1112 ures_close(bundle);
1113 return vtz;
1114 }
1115
1116 VTimeZone*
createVTimeZone(const UnicodeString & vtzdata,UErrorCode & status)1117 VTimeZone::createVTimeZone(const UnicodeString& vtzdata, UErrorCode& status) {
1118 if (U_FAILURE(status)) {
1119 return NULL;
1120 }
1121 VTZReader reader(vtzdata);
1122 VTimeZone *vtz = new VTimeZone();
1123 vtz->load(reader, status);
1124 if (U_FAILURE(status)) {
1125 delete vtz;
1126 return NULL;
1127 }
1128 return vtz;
1129 }
1130
1131 UBool
getTZURL(UnicodeString & url) const1132 VTimeZone::getTZURL(UnicodeString& url) const {
1133 if (tzurl.length() > 0) {
1134 url = tzurl;
1135 return TRUE;
1136 }
1137 return FALSE;
1138 }
1139
1140 void
setTZURL(const UnicodeString & url)1141 VTimeZone::setTZURL(const UnicodeString& url) {
1142 tzurl = url;
1143 }
1144
1145 UBool
getLastModified(UDate & lastModified) const1146 VTimeZone::getLastModified(UDate& lastModified) const {
1147 if (lastmod != MAX_MILLIS) {
1148 lastModified = lastmod;
1149 return TRUE;
1150 }
1151 return FALSE;
1152 }
1153
1154 void
setLastModified(UDate lastModified)1155 VTimeZone::setLastModified(UDate lastModified) {
1156 lastmod = lastModified;
1157 }
1158
1159 void
write(UnicodeString & result,UErrorCode & status) const1160 VTimeZone::write(UnicodeString& result, UErrorCode& status) const {
1161 result.remove();
1162 VTZWriter writer(result);
1163 write(writer, status);
1164 }
1165
1166 void
write(UDate start,UnicodeString & result,UErrorCode & status) const1167 VTimeZone::write(UDate start, UnicodeString& result, UErrorCode& status) const {
1168 result.remove();
1169 VTZWriter writer(result);
1170 write(start, writer, status);
1171 }
1172
1173 void
writeSimple(UDate time,UnicodeString & result,UErrorCode & status) const1174 VTimeZone::writeSimple(UDate time, UnicodeString& result, UErrorCode& status) const {
1175 result.remove();
1176 VTZWriter writer(result);
1177 writeSimple(time, writer, status);
1178 }
1179
1180 VTimeZone*
clone() const1181 VTimeZone::clone() const {
1182 return new VTimeZone(*this);
1183 }
1184
1185 int32_t
getOffset(uint8_t era,int32_t year,int32_t month,int32_t day,uint8_t dayOfWeek,int32_t millis,UErrorCode & status) const1186 VTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
1187 uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const {
1188 return tz->getOffset(era, year, month, day, dayOfWeek, millis, status);
1189 }
1190
1191 int32_t
getOffset(uint8_t era,int32_t year,int32_t month,int32_t day,uint8_t dayOfWeek,int32_t millis,int32_t monthLength,UErrorCode & status) const1192 VTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
1193 uint8_t dayOfWeek, int32_t millis,
1194 int32_t monthLength, UErrorCode& status) const {
1195 return tz->getOffset(era, year, month, day, dayOfWeek, millis, monthLength, status);
1196 }
1197
1198 void
getOffset(UDate date,UBool local,int32_t & rawOffset,int32_t & dstOffset,UErrorCode & status) const1199 VTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset,
1200 int32_t& dstOffset, UErrorCode& status) const {
1201 return tz->getOffset(date, local, rawOffset, dstOffset, status);
1202 }
1203
1204 void
setRawOffset(int32_t offsetMillis)1205 VTimeZone::setRawOffset(int32_t offsetMillis) {
1206 tz->setRawOffset(offsetMillis);
1207 }
1208
1209 int32_t
getRawOffset(void) const1210 VTimeZone::getRawOffset(void) const {
1211 return tz->getRawOffset();
1212 }
1213
1214 UBool
useDaylightTime(void) const1215 VTimeZone::useDaylightTime(void) const {
1216 return tz->useDaylightTime();
1217 }
1218
1219 UBool
inDaylightTime(UDate date,UErrorCode & status) const1220 VTimeZone::inDaylightTime(UDate date, UErrorCode& status) const {
1221 return tz->inDaylightTime(date, status);
1222 }
1223
1224 UBool
hasSameRules(const TimeZone & other) const1225 VTimeZone::hasSameRules(const TimeZone& other) const {
1226 return tz->hasSameRules(other);
1227 }
1228
1229 UBool
getNextTransition(UDate base,UBool inclusive,TimeZoneTransition & result) const1230 VTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
1231 return tz->getNextTransition(base, inclusive, result);
1232 }
1233
1234 UBool
getPreviousTransition(UDate base,UBool inclusive,TimeZoneTransition & result) const1235 VTimeZone::getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
1236 return tz->getPreviousTransition(base, inclusive, result);
1237 }
1238
1239 int32_t
countTransitionRules(UErrorCode & status) const1240 VTimeZone::countTransitionRules(UErrorCode& status) const {
1241 return tz->countTransitionRules(status);
1242 }
1243
1244 void
getTimeZoneRules(const InitialTimeZoneRule * & initial,const TimeZoneRule * trsrules[],int32_t & trscount,UErrorCode & status) const1245 VTimeZone::getTimeZoneRules(const InitialTimeZoneRule*& initial,
1246 const TimeZoneRule* trsrules[], int32_t& trscount,
1247 UErrorCode& status) const {
1248 tz->getTimeZoneRules(initial, trsrules, trscount, status);
1249 }
1250
1251 void
load(VTZReader & reader,UErrorCode & status)1252 VTimeZone::load(VTZReader& reader, UErrorCode& status) {
1253 vtzlines = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, DEFAULT_VTIMEZONE_LINES, status);
1254 if (U_FAILURE(status)) {
1255 return;
1256 }
1257 UBool eol = FALSE;
1258 UBool start = FALSE;
1259 UBool success = FALSE;
1260 UnicodeString line;
1261
1262 while (TRUE) {
1263 UChar ch = reader.read();
1264 if (ch == 0xFFFF) {
1265 // end of file
1266 if (start && line.startsWith(ICAL_END_VTIMEZONE, -1)) {
1267 vtzlines->addElement(new UnicodeString(line), status);
1268 if (U_FAILURE(status)) {
1269 goto cleanupVtzlines;
1270 }
1271 success = TRUE;
1272 }
1273 break;
1274 }
1275 if (ch == 0x000D) {
1276 // CR, must be followed by LF according to the definition in RFC2445
1277 continue;
1278 }
1279 if (eol) {
1280 if (ch != 0x0009 && ch != 0x0020) {
1281 // NOT followed by TAB/SP -> new line
1282 if (start) {
1283 if (line.length() > 0) {
1284 vtzlines->addElement(new UnicodeString(line), status);
1285 if (U_FAILURE(status)) {
1286 goto cleanupVtzlines;
1287 }
1288 }
1289 }
1290 line.remove();
1291 if (ch != 0x000A) {
1292 line.append(ch);
1293 }
1294 }
1295 eol = FALSE;
1296 } else {
1297 if (ch == 0x000A) {
1298 // LF
1299 eol = TRUE;
1300 if (start) {
1301 if (line.startsWith(ICAL_END_VTIMEZONE, -1)) {
1302 vtzlines->addElement(new UnicodeString(line), status);
1303 if (U_FAILURE(status)) {
1304 goto cleanupVtzlines;
1305 }
1306 success = TRUE;
1307 break;
1308 }
1309 } else {
1310 if (line.startsWith(ICAL_BEGIN_VTIMEZONE, -1)) {
1311 vtzlines->addElement(new UnicodeString(line), status);
1312 if (U_FAILURE(status)) {
1313 goto cleanupVtzlines;
1314 }
1315 line.remove();
1316 start = TRUE;
1317 eol = FALSE;
1318 }
1319 }
1320 } else {
1321 line.append(ch);
1322 }
1323 }
1324 }
1325 if (!success) {
1326 if (U_SUCCESS(status)) {
1327 status = U_INVALID_STATE_ERROR;
1328 }
1329 goto cleanupVtzlines;
1330 }
1331 parse(status);
1332 return;
1333
1334 cleanupVtzlines:
1335 delete vtzlines;
1336 vtzlines = NULL;
1337 }
1338
1339 // parser state
1340 #define INI 0 // Initial state
1341 #define VTZ 1 // In VTIMEZONE
1342 #define TZI 2 // In STANDARD or DAYLIGHT
1343
1344 #define DEF_DSTSAVINGS (60*60*1000)
1345 #define DEF_TZSTARTTIME (0.0)
1346
1347 void
parse(UErrorCode & status)1348 VTimeZone::parse(UErrorCode& status) {
1349 if (U_FAILURE(status)) {
1350 return;
1351 }
1352 if (vtzlines == NULL || vtzlines->size() == 0) {
1353 status = U_INVALID_STATE_ERROR;
1354 return;
1355 }
1356 InitialTimeZoneRule *initialRule = NULL;
1357 RuleBasedTimeZone *rbtz = NULL;
1358
1359 // timezone ID
1360 UnicodeString tzid;
1361
1362 int32_t state = INI;
1363 int32_t n = 0;
1364 UBool dst = FALSE; // current zone type
1365 UnicodeString from; // current zone from offset
1366 UnicodeString to; // current zone offset
1367 UnicodeString zonename; // current zone name
1368 UnicodeString dtstart; // current zone starts
1369 UBool isRRULE = FALSE; // true if the rule is described by RRULE
1370 int32_t initialRawOffset = 0; // initial offset
1371 int32_t initialDSTSavings = 0; // initial offset
1372 UDate firstStart = MAX_MILLIS; // the earliest rule start time
1373 UnicodeString name; // RFC2445 prop name
1374 UnicodeString value; // RFC2445 prop value
1375
1376 UVector *dates = NULL; // list of RDATE or RRULE strings
1377 UVector *rules = NULL; // list of TimeZoneRule instances
1378
1379 int32_t finalRuleIdx = -1;
1380 int32_t finalRuleCount = 0;
1381
1382 rules = new UVector(status);
1383 if (U_FAILURE(status)) {
1384 goto cleanupParse;
1385 }
1386 // Set the deleter to remove TimeZoneRule vectors to avoid memory leaks due to unowned TimeZoneRules.
1387 rules->setDeleter(deleteTimeZoneRule);
1388
1389 dates = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, status);
1390 if (U_FAILURE(status)) {
1391 goto cleanupParse;
1392 }
1393 if (rules == NULL || dates == NULL) {
1394 status = U_MEMORY_ALLOCATION_ERROR;
1395 goto cleanupParse;
1396 }
1397
1398 for (n = 0; n < vtzlines->size(); n++) {
1399 UnicodeString *line = (UnicodeString*)vtzlines->elementAt(n);
1400 int32_t valueSep = line->indexOf(COLON);
1401 if (valueSep < 0) {
1402 continue;
1403 }
1404 name.setTo(*line, 0, valueSep);
1405 value.setTo(*line, valueSep + 1);
1406
1407 switch (state) {
1408 case INI:
1409 if (name.compare(ICAL_BEGIN, -1) == 0
1410 && value.compare(ICAL_VTIMEZONE, -1) == 0) {
1411 state = VTZ;
1412 }
1413 break;
1414
1415 case VTZ:
1416 if (name.compare(ICAL_TZID, -1) == 0) {
1417 tzid = value;
1418 } else if (name.compare(ICAL_TZURL, -1) == 0) {
1419 tzurl = value;
1420 } else if (name.compare(ICAL_LASTMOD, -1) == 0) {
1421 // Always in 'Z' format, so the offset argument for the parse method
1422 // can be any value.
1423 lastmod = parseDateTimeString(value, 0, status);
1424 if (U_FAILURE(status)) {
1425 goto cleanupParse;
1426 }
1427 } else if (name.compare(ICAL_BEGIN, -1) == 0) {
1428 UBool isDST = (value.compare(ICAL_DAYLIGHT, -1) == 0);
1429 if (value.compare(ICAL_STANDARD, -1) == 0 || isDST) {
1430 // tzid must be ready at this point
1431 if (tzid.length() == 0) {
1432 goto cleanupParse;
1433 }
1434 // initialize current zone properties
1435 if (dates->size() != 0) {
1436 dates->removeAllElements();
1437 }
1438 isRRULE = FALSE;
1439 from.remove();
1440 to.remove();
1441 zonename.remove();
1442 dst = isDST;
1443 state = TZI;
1444 } else {
1445 // BEGIN property other than STANDARD/DAYLIGHT
1446 // must not be there.
1447 goto cleanupParse;
1448 }
1449 } else if (name.compare(ICAL_END, -1) == 0) {
1450 break;
1451 }
1452 break;
1453 case TZI:
1454 if (name.compare(ICAL_DTSTART, -1) == 0) {
1455 dtstart = value;
1456 } else if (name.compare(ICAL_TZNAME, -1) == 0) {
1457 zonename = value;
1458 } else if (name.compare(ICAL_TZOFFSETFROM, -1) == 0) {
1459 from = value;
1460 } else if (name.compare(ICAL_TZOFFSETTO, -1) == 0) {
1461 to = value;
1462 } else if (name.compare(ICAL_RDATE, -1) == 0) {
1463 // RDATE mixed with RRULE is not supported
1464 if (isRRULE) {
1465 goto cleanupParse;
1466 }
1467 // RDATE value may contain multiple date delimited
1468 // by comma
1469 UBool nextDate = TRUE;
1470 int32_t dstart = 0;
1471 UnicodeString *dstr;
1472 while (nextDate) {
1473 int32_t dend = value.indexOf(COMMA, dstart);
1474 if (dend == -1) {
1475 dstr = new UnicodeString(value, dstart);
1476 nextDate = FALSE;
1477 } else {
1478 dstr = new UnicodeString(value, dstart, dend - dstart);
1479 }
1480 dates->addElement(dstr, status);
1481 if (U_FAILURE(status)) {
1482 goto cleanupParse;
1483 }
1484 dstart = dend + 1;
1485 }
1486 } else if (name.compare(ICAL_RRULE, -1) == 0) {
1487 // RRULE mixed with RDATE is not supported
1488 if (!isRRULE && dates->size() != 0) {
1489 goto cleanupParse;
1490 }
1491 isRRULE = true;
1492 dates->addElement(new UnicodeString(value), status);
1493 if (U_FAILURE(status)) {
1494 goto cleanupParse;
1495 }
1496 } else if (name.compare(ICAL_END, -1) == 0) {
1497 // Mandatory properties
1498 if (dtstart.length() == 0 || from.length() == 0 || to.length() == 0) {
1499 goto cleanupParse;
1500 }
1501 // if zonename is not available, create one from tzid
1502 if (zonename.length() == 0) {
1503 getDefaultTZName(tzid, dst, zonename);
1504 }
1505
1506 // create a time zone rule
1507 TimeZoneRule *rule = NULL;
1508 int32_t fromOffset = 0;
1509 int32_t toOffset = 0;
1510 int32_t rawOffset = 0;
1511 int32_t dstSavings = 0;
1512 UDate start = 0;
1513
1514 // Parse TZOFFSETFROM/TZOFFSETTO
1515 fromOffset = offsetStrToMillis(from, status);
1516 toOffset = offsetStrToMillis(to, status);
1517 if (U_FAILURE(status)) {
1518 goto cleanupParse;
1519 }
1520
1521 if (dst) {
1522 // If daylight, use the previous offset as rawoffset if positive
1523 if (toOffset - fromOffset > 0) {
1524 rawOffset = fromOffset;
1525 dstSavings = toOffset - fromOffset;
1526 } else {
1527 // This is rare case.. just use 1 hour DST savings
1528 rawOffset = toOffset - DEF_DSTSAVINGS;
1529 dstSavings = DEF_DSTSAVINGS;
1530 }
1531 } else {
1532 rawOffset = toOffset;
1533 dstSavings = 0;
1534 }
1535
1536 // start time
1537 start = parseDateTimeString(dtstart, fromOffset, status);
1538 if (U_FAILURE(status)) {
1539 goto cleanupParse;
1540 }
1541
1542 // Create the rule
1543 UDate actualStart = MAX_MILLIS;
1544 if (isRRULE) {
1545 rule = createRuleByRRULE(zonename, rawOffset, dstSavings, start, dates, fromOffset, status);
1546 } else {
1547 rule = createRuleByRDATE(zonename, rawOffset, dstSavings, start, dates, fromOffset, status);
1548 }
1549 if (U_FAILURE(status) || rule == NULL) {
1550 goto cleanupParse;
1551 } else {
1552 UBool startAvail = rule->getFirstStart(fromOffset, 0, actualStart);
1553 if (startAvail && actualStart < firstStart) {
1554 // save from offset information for the earliest rule
1555 firstStart = actualStart;
1556 // If this is STD, assume the time before this transtion
1557 // is DST when the difference is 1 hour. This might not be
1558 // accurate, but VTIMEZONE data does not have such info.
1559 if (dstSavings > 0) {
1560 initialRawOffset = fromOffset;
1561 initialDSTSavings = 0;
1562 } else {
1563 if (fromOffset - toOffset == DEF_DSTSAVINGS) {
1564 initialRawOffset = fromOffset - DEF_DSTSAVINGS;
1565 initialDSTSavings = DEF_DSTSAVINGS;
1566 } else {
1567 initialRawOffset = fromOffset;
1568 initialDSTSavings = 0;
1569 }
1570 }
1571 }
1572 }
1573 rules->addElement(rule, status);
1574 if (U_FAILURE(status)) {
1575 goto cleanupParse;
1576 }
1577 state = VTZ;
1578 }
1579 break;
1580 }
1581 }
1582 // Must have at least one rule
1583 if (rules->size() == 0) {
1584 goto cleanupParse;
1585 }
1586
1587 // Create a initial rule
1588 getDefaultTZName(tzid, FALSE, zonename);
1589 initialRule = new InitialTimeZoneRule(zonename,
1590 initialRawOffset, initialDSTSavings);
1591 if (initialRule == NULL) {
1592 status = U_MEMORY_ALLOCATION_ERROR;
1593 goto cleanupParse;
1594 }
1595
1596 // Finally, create the RuleBasedTimeZone
1597 rbtz = new RuleBasedTimeZone(tzid, initialRule);
1598 if (rbtz == NULL) {
1599 status = U_MEMORY_ALLOCATION_ERROR;
1600 goto cleanupParse;
1601 }
1602 initialRule = NULL; // already adopted by RBTZ, no need to delete
1603
1604 for (n = 0; n < rules->size(); n++) {
1605 TimeZoneRule *r = (TimeZoneRule*)rules->elementAt(n);
1606 AnnualTimeZoneRule *atzrule = dynamic_cast<AnnualTimeZoneRule *>(r);
1607 if (atzrule != NULL) {
1608 if (atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) {
1609 finalRuleCount++;
1610 finalRuleIdx = n;
1611 }
1612 }
1613 }
1614 if (finalRuleCount > 2) {
1615 // Too many final rules
1616 status = U_ILLEGAL_ARGUMENT_ERROR;
1617 goto cleanupParse;
1618 }
1619
1620 if (finalRuleCount == 1) {
1621 if (rules->size() == 1) {
1622 // Only one final rule, only governs the initial rule,
1623 // which is already initialized, thus, we do not need to
1624 // add this transition rule
1625 rules->removeAllElements();
1626 } else {
1627 // Normalize the final rule
1628 AnnualTimeZoneRule *finalRule = (AnnualTimeZoneRule*)rules->elementAt(finalRuleIdx);
1629 int32_t tmpRaw = finalRule->getRawOffset();
1630 int32_t tmpDST = finalRule->getDSTSavings();
1631
1632 // Find the last non-final rule
1633 UDate finalStart, start;
1634 finalRule->getFirstStart(initialRawOffset, initialDSTSavings, finalStart);
1635 start = finalStart;
1636 for (n = 0; n < rules->size(); n++) {
1637 if (finalRuleIdx == n) {
1638 continue;
1639 }
1640 TimeZoneRule *r = (TimeZoneRule*)rules->elementAt(n);
1641 UDate lastStart;
1642 r->getFinalStart(tmpRaw, tmpDST, lastStart);
1643 if (lastStart > start) {
1644 finalRule->getNextStart(lastStart,
1645 r->getRawOffset(),
1646 r->getDSTSavings(),
1647 FALSE,
1648 start);
1649 }
1650 }
1651
1652 TimeZoneRule *newRule;
1653 UnicodeString tznam;
1654 if (start == finalStart) {
1655 // Transform this into a single transition
1656 newRule = new TimeArrayTimeZoneRule(
1657 finalRule->getName(tznam),
1658 finalRule->getRawOffset(),
1659 finalRule->getDSTSavings(),
1660 &finalStart,
1661 1,
1662 DateTimeRule::UTC_TIME);
1663 } else {
1664 // Update the end year
1665 int32_t y, m, d, dow, doy, mid;
1666 Grego::timeToFields(start, y, m, d, dow, doy, mid);
1667 newRule = new AnnualTimeZoneRule(
1668 finalRule->getName(tznam),
1669 finalRule->getRawOffset(),
1670 finalRule->getDSTSavings(),
1671 *(finalRule->getRule()),
1672 finalRule->getStartYear(),
1673 y);
1674 }
1675 if (newRule == NULL) {
1676 status = U_MEMORY_ALLOCATION_ERROR;
1677 goto cleanupParse;
1678 }
1679 rules->removeElementAt(finalRuleIdx);
1680 rules->addElement(newRule, status);
1681 if (U_FAILURE(status)) {
1682 delete newRule;
1683 goto cleanupParse;
1684 }
1685 }
1686 }
1687
1688 while (!rules->isEmpty()) {
1689 TimeZoneRule *tzr = (TimeZoneRule*)rules->orphanElementAt(0);
1690 rbtz->addTransitionRule(tzr, status);
1691 if (U_FAILURE(status)) {
1692 goto cleanupParse;
1693 }
1694 }
1695 rbtz->complete(status);
1696 if (U_FAILURE(status)) {
1697 goto cleanupParse;
1698 }
1699 delete rules;
1700 delete dates;
1701
1702 tz = rbtz;
1703 setID(tzid);
1704 return;
1705
1706 cleanupParse:
1707 if (rules != NULL) {
1708 while (!rules->isEmpty()) {
1709 TimeZoneRule *r = (TimeZoneRule*)rules->orphanElementAt(0);
1710 delete r;
1711 }
1712 delete rules;
1713 }
1714 if (dates != NULL) {
1715 delete dates;
1716 }
1717 if (initialRule != NULL) {
1718 delete initialRule;
1719 }
1720 if (rbtz != NULL) {
1721 delete rbtz;
1722 }
1723 return;
1724 }
1725
1726 void
write(VTZWriter & writer,UErrorCode & status) const1727 VTimeZone::write(VTZWriter& writer, UErrorCode& status) const {
1728 if (vtzlines != NULL) {
1729 for (int32_t i = 0; i < vtzlines->size(); i++) {
1730 UnicodeString *line = (UnicodeString*)vtzlines->elementAt(i);
1731 if (line->startsWith(ICAL_TZURL, -1)
1732 && line->charAt(u_strlen(ICAL_TZURL)) == COLON) {
1733 writer.write(ICAL_TZURL);
1734 writer.write(COLON);
1735 writer.write(tzurl);
1736 writer.write(ICAL_NEWLINE);
1737 } else if (line->startsWith(ICAL_LASTMOD, -1)
1738 && line->charAt(u_strlen(ICAL_LASTMOD)) == COLON) {
1739 UnicodeString utcString;
1740 writer.write(ICAL_LASTMOD);
1741 writer.write(COLON);
1742 writer.write(getUTCDateTimeString(lastmod, utcString));
1743 writer.write(ICAL_NEWLINE);
1744 } else {
1745 writer.write(*line);
1746 writer.write(ICAL_NEWLINE);
1747 }
1748 }
1749 } else {
1750 UnicodeString icutzprop;
1751 UVector customProps(nullptr, uhash_compareUnicodeString, status);
1752 if (olsonzid.length() > 0 && icutzver.length() > 0) {
1753 icutzprop.append(olsonzid);
1754 icutzprop.append(u'[');
1755 icutzprop.append(icutzver);
1756 icutzprop.append(u']');
1757 customProps.addElement(&icutzprop, status);
1758 }
1759 writeZone(writer, *tz, &customProps, status);
1760 }
1761 }
1762
1763 void
write(UDate start,VTZWriter & writer,UErrorCode & status) const1764 VTimeZone::write(UDate start, VTZWriter& writer, UErrorCode& status) const {
1765 if (U_FAILURE(status)) {
1766 return;
1767 }
1768 InitialTimeZoneRule *initial = NULL;
1769 UVector *transitionRules = NULL;
1770 UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
1771 UnicodeString tzid;
1772
1773 // Extract rules applicable to dates after the start time
1774 getTimeZoneRulesAfter(start, initial, transitionRules, status);
1775 if (U_FAILURE(status)) {
1776 return;
1777 }
1778
1779 // Create a RuleBasedTimeZone with the subset rule
1780 getID(tzid);
1781 RuleBasedTimeZone rbtz(tzid, initial);
1782 if (transitionRules != NULL) {
1783 while (!transitionRules->isEmpty()) {
1784 TimeZoneRule *tr = (TimeZoneRule*)transitionRules->orphanElementAt(0);
1785 rbtz.addTransitionRule(tr, status);
1786 if (U_FAILURE(status)) {
1787 goto cleanupWritePartial;
1788 }
1789 }
1790 delete transitionRules;
1791 transitionRules = NULL;
1792 }
1793 rbtz.complete(status);
1794 if (U_FAILURE(status)) {
1795 goto cleanupWritePartial;
1796 }
1797
1798 if (olsonzid.length() > 0 && icutzver.length() > 0) {
1799 UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
1800 icutzprop->append(olsonzid);
1801 icutzprop->append((UChar)0x005B/*'['*/);
1802 icutzprop->append(icutzver);
1803 icutzprop->append(ICU_TZINFO_PARTIAL, -1);
1804 appendMillis(start, *icutzprop);
1805 icutzprop->append((UChar)0x005D/*']'*/);
1806 customProps.addElement(icutzprop, status);
1807 if (U_FAILURE(status)) {
1808 delete icutzprop;
1809 goto cleanupWritePartial;
1810 }
1811 }
1812 writeZone(writer, rbtz, &customProps, status);
1813 return;
1814
1815 cleanupWritePartial:
1816 if (initial != NULL) {
1817 delete initial;
1818 }
1819 if (transitionRules != NULL) {
1820 while (!transitionRules->isEmpty()) {
1821 TimeZoneRule *tr = (TimeZoneRule*)transitionRules->orphanElementAt(0);
1822 delete tr;
1823 }
1824 delete transitionRules;
1825 }
1826 }
1827
1828 void
writeSimple(UDate time,VTZWriter & writer,UErrorCode & status) const1829 VTimeZone::writeSimple(UDate time, VTZWriter& writer, UErrorCode& status) const {
1830 if (U_FAILURE(status)) {
1831 return;
1832 }
1833
1834 UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
1835 UnicodeString tzid;
1836
1837 // Extract simple rules
1838 InitialTimeZoneRule *initial = NULL;
1839 AnnualTimeZoneRule *std = NULL, *dst = NULL;
1840 getSimpleRulesNear(time, initial, std, dst, status);
1841 if (U_SUCCESS(status)) {
1842 // Create a RuleBasedTimeZone with the subset rule
1843 getID(tzid);
1844 RuleBasedTimeZone rbtz(tzid, initial);
1845 if (std != NULL && dst != NULL) {
1846 rbtz.addTransitionRule(std, status);
1847 rbtz.addTransitionRule(dst, status);
1848 }
1849 if (U_FAILURE(status)) {
1850 goto cleanupWriteSimple;
1851 }
1852
1853 if (olsonzid.length() > 0 && icutzver.length() > 0) {
1854 UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
1855 icutzprop->append(olsonzid);
1856 icutzprop->append((UChar)0x005B/*'['*/);
1857 icutzprop->append(icutzver);
1858 icutzprop->append(ICU_TZINFO_SIMPLE, -1);
1859 appendMillis(time, *icutzprop);
1860 icutzprop->append((UChar)0x005D/*']'*/);
1861 customProps.addElement(icutzprop, status);
1862 if (U_FAILURE(status)) {
1863 delete icutzprop;
1864 goto cleanupWriteSimple;
1865 }
1866 }
1867 writeZone(writer, rbtz, &customProps, status);
1868 }
1869 return;
1870
1871 cleanupWriteSimple:
1872 if (initial != NULL) {
1873 delete initial;
1874 }
1875 if (std != NULL) {
1876 delete std;
1877 }
1878 if (dst != NULL) {
1879 delete dst;
1880 }
1881 }
1882
1883 void
writeZone(VTZWriter & w,BasicTimeZone & basictz,UVector * customProps,UErrorCode & status) const1884 VTimeZone::writeZone(VTZWriter& w, BasicTimeZone& basictz,
1885 UVector* customProps, UErrorCode& status) const {
1886 if (U_FAILURE(status)) {
1887 return;
1888 }
1889 writeHeaders(w, status);
1890 if (U_FAILURE(status)) {
1891 return;
1892 }
1893
1894 if (customProps != NULL) {
1895 for (int32_t i = 0; i < customProps->size(); i++) {
1896 UnicodeString *custprop = (UnicodeString*)customProps->elementAt(i);
1897 w.write(*custprop);
1898 w.write(ICAL_NEWLINE);
1899 }
1900 }
1901
1902 UDate t = MIN_MILLIS;
1903 UnicodeString dstName;
1904 int32_t dstFromOffset = 0;
1905 int32_t dstFromDSTSavings = 0;
1906 int32_t dstToOffset = 0;
1907 int32_t dstStartYear = 0;
1908 int32_t dstMonth = 0;
1909 int32_t dstDayOfWeek = 0;
1910 int32_t dstWeekInMonth = 0;
1911 int32_t dstMillisInDay = 0;
1912 UDate dstStartTime = 0.0;
1913 UDate dstUntilTime = 0.0;
1914 int32_t dstCount = 0;
1915 AnnualTimeZoneRule *finalDstRule = NULL;
1916
1917 UnicodeString stdName;
1918 int32_t stdFromOffset = 0;
1919 int32_t stdFromDSTSavings = 0;
1920 int32_t stdToOffset = 0;
1921 int32_t stdStartYear = 0;
1922 int32_t stdMonth = 0;
1923 int32_t stdDayOfWeek = 0;
1924 int32_t stdWeekInMonth = 0;
1925 int32_t stdMillisInDay = 0;
1926 UDate stdStartTime = 0.0;
1927 UDate stdUntilTime = 0.0;
1928 int32_t stdCount = 0;
1929 AnnualTimeZoneRule *finalStdRule = NULL;
1930
1931 int32_t year, month, dom, dow, doy, mid;
1932 UBool hasTransitions = FALSE;
1933 TimeZoneTransition tzt;
1934 UBool tztAvail;
1935 UnicodeString name;
1936 UBool isDst;
1937
1938 // Going through all transitions
1939 while (TRUE) {
1940 tztAvail = basictz.getNextTransition(t, FALSE, tzt);
1941 if (!tztAvail) {
1942 break;
1943 }
1944 hasTransitions = TRUE;
1945 t = tzt.getTime();
1946 tzt.getTo()->getName(name);
1947 isDst = (tzt.getTo()->getDSTSavings() != 0);
1948 int32_t fromOffset = tzt.getFrom()->getRawOffset() + tzt.getFrom()->getDSTSavings();
1949 int32_t fromDSTSavings = tzt.getFrom()->getDSTSavings();
1950 int32_t toOffset = tzt.getTo()->getRawOffset() + tzt.getTo()->getDSTSavings();
1951 Grego::timeToFields(tzt.getTime() + fromOffset, year, month, dom, dow, doy, mid);
1952 int32_t weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
1953 UBool sameRule = FALSE;
1954 const AnnualTimeZoneRule *atzrule;
1955 if (isDst) {
1956 if (finalDstRule == NULL
1957 && (atzrule = dynamic_cast<const AnnualTimeZoneRule *>(tzt.getTo())) != NULL
1958 && atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR
1959 ) {
1960 finalDstRule = atzrule->clone();
1961 }
1962 if (dstCount > 0) {
1963 if (year == dstStartYear + dstCount
1964 && name.compare(dstName) == 0
1965 && dstFromOffset == fromOffset
1966 && dstToOffset == toOffset
1967 && dstMonth == month
1968 && dstDayOfWeek == dow
1969 && dstWeekInMonth == weekInMonth
1970 && dstMillisInDay == mid) {
1971 // Update until time
1972 dstUntilTime = t;
1973 dstCount++;
1974 sameRule = TRUE;
1975 }
1976 if (!sameRule) {
1977 if (dstCount == 1) {
1978 writeZonePropsByTime(w, TRUE, dstName, dstFromOffset, dstToOffset, dstStartTime,
1979 TRUE, status);
1980 } else {
1981 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
1982 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
1983 }
1984 if (U_FAILURE(status)) {
1985 goto cleanupWriteZone;
1986 }
1987 }
1988 }
1989 if (!sameRule) {
1990 // Reset this DST information
1991 dstName = name;
1992 dstFromOffset = fromOffset;
1993 dstFromDSTSavings = fromDSTSavings;
1994 dstToOffset = toOffset;
1995 dstStartYear = year;
1996 dstMonth = month;
1997 dstDayOfWeek = dow;
1998 dstWeekInMonth = weekInMonth;
1999 dstMillisInDay = mid;
2000 dstStartTime = dstUntilTime = t;
2001 dstCount = 1;
2002 }
2003 if (finalStdRule != NULL && finalDstRule != NULL) {
2004 break;
2005 }
2006 } else {
2007 if (finalStdRule == NULL
2008 && (atzrule = dynamic_cast<const AnnualTimeZoneRule *>(tzt.getTo())) != NULL
2009 && atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR
2010 ) {
2011 finalStdRule = atzrule->clone();
2012 }
2013 if (stdCount > 0) {
2014 if (year == stdStartYear + stdCount
2015 && name.compare(stdName) == 0
2016 && stdFromOffset == fromOffset
2017 && stdToOffset == toOffset
2018 && stdMonth == month
2019 && stdDayOfWeek == dow
2020 && stdWeekInMonth == weekInMonth
2021 && stdMillisInDay == mid) {
2022 // Update until time
2023 stdUntilTime = t;
2024 stdCount++;
2025 sameRule = TRUE;
2026 }
2027 if (!sameRule) {
2028 if (stdCount == 1) {
2029 writeZonePropsByTime(w, FALSE, stdName, stdFromOffset, stdToOffset, stdStartTime,
2030 TRUE, status);
2031 } else {
2032 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2033 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
2034 }
2035 if (U_FAILURE(status)) {
2036 goto cleanupWriteZone;
2037 }
2038 }
2039 }
2040 if (!sameRule) {
2041 // Reset this STD information
2042 stdName = name;
2043 stdFromOffset = fromOffset;
2044 stdFromDSTSavings = fromDSTSavings;
2045 stdToOffset = toOffset;
2046 stdStartYear = year;
2047 stdMonth = month;
2048 stdDayOfWeek = dow;
2049 stdWeekInMonth = weekInMonth;
2050 stdMillisInDay = mid;
2051 stdStartTime = stdUntilTime = t;
2052 stdCount = 1;
2053 }
2054 if (finalStdRule != NULL && finalDstRule != NULL) {
2055 break;
2056 }
2057 }
2058 }
2059 if (!hasTransitions) {
2060 // No transition - put a single non transition RDATE
2061 int32_t raw, dst, offset;
2062 basictz.getOffset(0.0/*any time*/, FALSE, raw, dst, status);
2063 if (U_FAILURE(status)) {
2064 goto cleanupWriteZone;
2065 }
2066 offset = raw + dst;
2067 isDst = (dst != 0);
2068 UnicodeString tzid;
2069 basictz.getID(tzid);
2070 getDefaultTZName(tzid, isDst, name);
2071 writeZonePropsByTime(w, isDst, name,
2072 offset, offset, DEF_TZSTARTTIME - offset, FALSE, status);
2073 if (U_FAILURE(status)) {
2074 goto cleanupWriteZone;
2075 }
2076 } else {
2077 if (dstCount > 0) {
2078 if (finalDstRule == NULL) {
2079 if (dstCount == 1) {
2080 writeZonePropsByTime(w, TRUE, dstName, dstFromOffset, dstToOffset, dstStartTime,
2081 TRUE, status);
2082 } else {
2083 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
2084 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
2085 }
2086 if (U_FAILURE(status)) {
2087 goto cleanupWriteZone;
2088 }
2089 } else {
2090 if (dstCount == 1) {
2091 writeFinalRule(w, TRUE, finalDstRule,
2092 dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, dstStartTime, status);
2093 } else {
2094 // Use a single rule if possible
2095 if (isEquivalentDateRule(dstMonth, dstWeekInMonth, dstDayOfWeek, finalDstRule->getRule())) {
2096 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
2097 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, MAX_MILLIS, status);
2098 } else {
2099 // Not equivalent rule - write out two different rules
2100 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
2101 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
2102 if (U_FAILURE(status)) {
2103 goto cleanupWriteZone;
2104 }
2105 UDate nextStart;
2106 UBool nextStartAvail = finalDstRule->getNextStart(dstUntilTime, dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, false, nextStart);
2107 U_ASSERT(nextStartAvail);
2108 if (nextStartAvail) {
2109 writeFinalRule(w, TRUE, finalDstRule,
2110 dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, nextStart, status);
2111 }
2112 }
2113 }
2114 if (U_FAILURE(status)) {
2115 goto cleanupWriteZone;
2116 }
2117 }
2118 }
2119 if (stdCount > 0) {
2120 if (finalStdRule == NULL) {
2121 if (stdCount == 1) {
2122 writeZonePropsByTime(w, FALSE, stdName, stdFromOffset, stdToOffset, stdStartTime,
2123 TRUE, status);
2124 } else {
2125 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2126 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
2127 }
2128 if (U_FAILURE(status)) {
2129 goto cleanupWriteZone;
2130 }
2131 } else {
2132 if (stdCount == 1) {
2133 writeFinalRule(w, FALSE, finalStdRule,
2134 stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, stdStartTime, status);
2135 } else {
2136 // Use a single rule if possible
2137 if (isEquivalentDateRule(stdMonth, stdWeekInMonth, stdDayOfWeek, finalStdRule->getRule())) {
2138 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2139 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, MAX_MILLIS, status);
2140 } else {
2141 // Not equivalent rule - write out two different rules
2142 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2143 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
2144 if (U_FAILURE(status)) {
2145 goto cleanupWriteZone;
2146 }
2147 UDate nextStart;
2148 UBool nextStartAvail = finalStdRule->getNextStart(stdUntilTime, stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, false, nextStart);
2149 U_ASSERT(nextStartAvail);
2150 if (nextStartAvail) {
2151 writeFinalRule(w, FALSE, finalStdRule,
2152 stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, nextStart, status);
2153 }
2154 }
2155 }
2156 if (U_FAILURE(status)) {
2157 goto cleanupWriteZone;
2158 }
2159 }
2160 }
2161 }
2162 writeFooter(w, status);
2163
2164 cleanupWriteZone:
2165
2166 if (finalStdRule != NULL) {
2167 delete finalStdRule;
2168 }
2169 if (finalDstRule != NULL) {
2170 delete finalDstRule;
2171 }
2172 }
2173
2174 void
writeHeaders(VTZWriter & writer,UErrorCode & status) const2175 VTimeZone::writeHeaders(VTZWriter& writer, UErrorCode& status) const {
2176 if (U_FAILURE(status)) {
2177 return;
2178 }
2179 UnicodeString tzid;
2180 tz->getID(tzid);
2181
2182 writer.write(ICAL_BEGIN);
2183 writer.write(COLON);
2184 writer.write(ICAL_VTIMEZONE);
2185 writer.write(ICAL_NEWLINE);
2186 writer.write(ICAL_TZID);
2187 writer.write(COLON);
2188 writer.write(tzid);
2189 writer.write(ICAL_NEWLINE);
2190 if (tzurl.length() != 0) {
2191 writer.write(ICAL_TZURL);
2192 writer.write(COLON);
2193 writer.write(tzurl);
2194 writer.write(ICAL_NEWLINE);
2195 }
2196 if (lastmod != MAX_MILLIS) {
2197 UnicodeString lastmodStr;
2198 writer.write(ICAL_LASTMOD);
2199 writer.write(COLON);
2200 writer.write(getUTCDateTimeString(lastmod, lastmodStr));
2201 writer.write(ICAL_NEWLINE);
2202 }
2203 }
2204
2205 /*
2206 * Write the closing section of the VTIMEZONE definition block
2207 */
2208 void
writeFooter(VTZWriter & writer,UErrorCode & status) const2209 VTimeZone::writeFooter(VTZWriter& writer, UErrorCode& status) const {
2210 if (U_FAILURE(status)) {
2211 return;
2212 }
2213 writer.write(ICAL_END);
2214 writer.write(COLON);
2215 writer.write(ICAL_VTIMEZONE);
2216 writer.write(ICAL_NEWLINE);
2217 }
2218
2219 /*
2220 * Write a single start time
2221 */
2222 void
writeZonePropsByTime(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,UDate time,UBool withRDATE,UErrorCode & status) const2223 VTimeZone::writeZonePropsByTime(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2224 int32_t fromOffset, int32_t toOffset, UDate time, UBool withRDATE,
2225 UErrorCode& status) const {
2226 if (U_FAILURE(status)) {
2227 return;
2228 }
2229 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, time, status);
2230 if (U_FAILURE(status)) {
2231 return;
2232 }
2233 if (withRDATE) {
2234 writer.write(ICAL_RDATE);
2235 writer.write(COLON);
2236 UnicodeString timestr;
2237 writer.write(getDateTimeString(time + fromOffset, timestr));
2238 writer.write(ICAL_NEWLINE);
2239 }
2240 endZoneProps(writer, isDst, status);
2241 if (U_FAILURE(status)) {
2242 return;
2243 }
2244 }
2245
2246 /*
2247 * Write start times defined by a DOM rule using VTIMEZONE RRULE
2248 */
2249 void
writeZonePropsByDOM(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,int32_t month,int32_t dayOfMonth,UDate startTime,UDate untilTime,UErrorCode & status) const2250 VTimeZone::writeZonePropsByDOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2251 int32_t fromOffset, int32_t toOffset,
2252 int32_t month, int32_t dayOfMonth, UDate startTime, UDate untilTime,
2253 UErrorCode& status) const {
2254 if (U_FAILURE(status)) {
2255 return;
2256 }
2257 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
2258 if (U_FAILURE(status)) {
2259 return;
2260 }
2261 beginRRULE(writer, month, status);
2262 if (U_FAILURE(status)) {
2263 return;
2264 }
2265 writer.write(ICAL_BYMONTHDAY);
2266 writer.write(EQUALS_SIGN);
2267 UnicodeString dstr;
2268 appendAsciiDigits(dayOfMonth, 0, dstr);
2269 writer.write(dstr);
2270 if (untilTime != MAX_MILLIS) {
2271 appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
2272 if (U_FAILURE(status)) {
2273 return;
2274 }
2275 }
2276 writer.write(ICAL_NEWLINE);
2277 endZoneProps(writer, isDst, status);
2278 }
2279
2280 /*
2281 * Write start times defined by a DOW rule using VTIMEZONE RRULE
2282 */
2283 void
writeZonePropsByDOW(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,int32_t month,int32_t weekInMonth,int32_t dayOfWeek,UDate startTime,UDate untilTime,UErrorCode & status) const2284 VTimeZone::writeZonePropsByDOW(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2285 int32_t fromOffset, int32_t toOffset,
2286 int32_t month, int32_t weekInMonth, int32_t dayOfWeek,
2287 UDate startTime, UDate untilTime, UErrorCode& status) const {
2288 if (U_FAILURE(status)) {
2289 return;
2290 }
2291 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
2292 if (U_FAILURE(status)) {
2293 return;
2294 }
2295 beginRRULE(writer, month, status);
2296 if (U_FAILURE(status)) {
2297 return;
2298 }
2299 writer.write(ICAL_BYDAY);
2300 writer.write(EQUALS_SIGN);
2301 UnicodeString dstr;
2302 appendAsciiDigits(weekInMonth, 0, dstr);
2303 writer.write(dstr); // -4, -3, -2, -1, 1, 2, 3, 4
2304 writer.write(ICAL_DOW_NAMES[dayOfWeek - 1]); // SU, MO, TU...
2305
2306 if (untilTime != MAX_MILLIS) {
2307 appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
2308 if (U_FAILURE(status)) {
2309 return;
2310 }
2311 }
2312 writer.write(ICAL_NEWLINE);
2313 endZoneProps(writer, isDst, status);
2314 }
2315
2316 /*
2317 * Write start times defined by a DOW_GEQ_DOM rule using VTIMEZONE RRULE
2318 */
2319 void
writeZonePropsByDOW_GEQ_DOM(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,int32_t month,int32_t dayOfMonth,int32_t dayOfWeek,UDate startTime,UDate untilTime,UErrorCode & status) const2320 VTimeZone::writeZonePropsByDOW_GEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2321 int32_t fromOffset, int32_t toOffset,
2322 int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
2323 UDate startTime, UDate untilTime, UErrorCode& status) const {
2324 if (U_FAILURE(status)) {
2325 return;
2326 }
2327 // Check if this rule can be converted to DOW rule
2328 if (dayOfMonth%7 == 1) {
2329 // Can be represented by DOW rule
2330 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2331 month, (dayOfMonth + 6)/7, dayOfWeek, startTime, untilTime, status);
2332 if (U_FAILURE(status)) {
2333 return;
2334 }
2335 } else if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - dayOfMonth)%7 == 6) {
2336 // Can be represented by DOW rule with negative week number
2337 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2338 month, -1*((MONTHLENGTH[month] - dayOfMonth + 1)/7), dayOfWeek, startTime, untilTime, status);
2339 if (U_FAILURE(status)) {
2340 return;
2341 }
2342 } else {
2343 // Otherwise, use BYMONTHDAY to include all possible dates
2344 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
2345 if (U_FAILURE(status)) {
2346 return;
2347 }
2348 // Check if all days are in the same month
2349 int32_t startDay = dayOfMonth;
2350 int32_t currentMonthDays = 7;
2351
2352 if (dayOfMonth <= 0) {
2353 // The start day is in previous month
2354 int32_t prevMonthDays = 1 - dayOfMonth;
2355 currentMonthDays -= prevMonthDays;
2356
2357 int32_t prevMonth = (month - 1) < 0 ? 11 : month - 1;
2358
2359 // Note: When a rule is separated into two, UNTIL attribute needs to be
2360 // calculated for each of them. For now, we skip this, because we basically use this method
2361 // only for final rules, which does not have the UNTIL attribute
2362 writeZonePropsByDOW_GEQ_DOM_sub(writer, prevMonth, -prevMonthDays, dayOfWeek, prevMonthDays,
2363 MAX_MILLIS /* Do not use UNTIL */, fromOffset, status);
2364 if (U_FAILURE(status)) {
2365 return;
2366 }
2367
2368 // Start from 1 for the rest
2369 startDay = 1;
2370 } else if (dayOfMonth + 6 > MONTHLENGTH[month]) {
2371 // Note: This code does not actually work well in February. For now, days in month in
2372 // non-leap year.
2373 int32_t nextMonthDays = dayOfMonth + 6 - MONTHLENGTH[month];
2374 currentMonthDays -= nextMonthDays;
2375
2376 int32_t nextMonth = (month + 1) > 11 ? 0 : month + 1;
2377
2378 writeZonePropsByDOW_GEQ_DOM_sub(writer, nextMonth, 1, dayOfWeek, nextMonthDays,
2379 MAX_MILLIS /* Do not use UNTIL */, fromOffset, status);
2380 if (U_FAILURE(status)) {
2381 return;
2382 }
2383 }
2384 writeZonePropsByDOW_GEQ_DOM_sub(writer, month, startDay, dayOfWeek, currentMonthDays,
2385 untilTime, fromOffset, status);
2386 if (U_FAILURE(status)) {
2387 return;
2388 }
2389 endZoneProps(writer, isDst, status);
2390 }
2391 }
2392
2393 /*
2394 * Called from writeZonePropsByDOW_GEQ_DOM
2395 */
2396 void
writeZonePropsByDOW_GEQ_DOM_sub(VTZWriter & writer,int32_t month,int32_t dayOfMonth,int32_t dayOfWeek,int32_t numDays,UDate untilTime,int32_t fromOffset,UErrorCode & status) const2397 VTimeZone::writeZonePropsByDOW_GEQ_DOM_sub(VTZWriter& writer, int32_t month, int32_t dayOfMonth,
2398 int32_t dayOfWeek, int32_t numDays,
2399 UDate untilTime, int32_t fromOffset, UErrorCode& status) const {
2400
2401 if (U_FAILURE(status)) {
2402 return;
2403 }
2404 int32_t startDayNum = dayOfMonth;
2405 UBool isFeb = (month == UCAL_FEBRUARY);
2406 if (dayOfMonth < 0 && !isFeb) {
2407 // Use positive number if possible
2408 startDayNum = MONTHLENGTH[month] + dayOfMonth + 1;
2409 }
2410 beginRRULE(writer, month, status);
2411 if (U_FAILURE(status)) {
2412 return;
2413 }
2414 writer.write(ICAL_BYDAY);
2415 writer.write(EQUALS_SIGN);
2416 writer.write(ICAL_DOW_NAMES[dayOfWeek - 1]); // SU, MO, TU...
2417 writer.write(SEMICOLON);
2418 writer.write(ICAL_BYMONTHDAY);
2419 writer.write(EQUALS_SIGN);
2420
2421 UnicodeString dstr;
2422 appendAsciiDigits(startDayNum, 0, dstr);
2423 writer.write(dstr);
2424 for (int32_t i = 1; i < numDays; i++) {
2425 writer.write(COMMA);
2426 dstr.remove();
2427 appendAsciiDigits(startDayNum + i, 0, dstr);
2428 writer.write(dstr);
2429 }
2430
2431 if (untilTime != MAX_MILLIS) {
2432 appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
2433 if (U_FAILURE(status)) {
2434 return;
2435 }
2436 }
2437 writer.write(ICAL_NEWLINE);
2438 }
2439
2440 /*
2441 * Write start times defined by a DOW_LEQ_DOM rule using VTIMEZONE RRULE
2442 */
2443 void
writeZonePropsByDOW_LEQ_DOM(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,int32_t month,int32_t dayOfMonth,int32_t dayOfWeek,UDate startTime,UDate untilTime,UErrorCode & status) const2444 VTimeZone::writeZonePropsByDOW_LEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2445 int32_t fromOffset, int32_t toOffset,
2446 int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
2447 UDate startTime, UDate untilTime, UErrorCode& status) const {
2448 if (U_FAILURE(status)) {
2449 return;
2450 }
2451 // Check if this rule can be converted to DOW rule
2452 if (dayOfMonth%7 == 0) {
2453 // Can be represented by DOW rule
2454 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2455 month, dayOfMonth/7, dayOfWeek, startTime, untilTime, status);
2456 } else if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - dayOfMonth)%7 == 0){
2457 // Can be represented by DOW rule with negative week number
2458 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2459 month, -1*((MONTHLENGTH[month] - dayOfMonth)/7 + 1), dayOfWeek, startTime, untilTime, status);
2460 } else if (month == UCAL_FEBRUARY && dayOfMonth == 29) {
2461 // Specical case for February
2462 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2463 UCAL_FEBRUARY, -1, dayOfWeek, startTime, untilTime, status);
2464 } else {
2465 // Otherwise, convert this to DOW_GEQ_DOM rule
2466 writeZonePropsByDOW_GEQ_DOM(writer, isDst, zonename, fromOffset, toOffset,
2467 month, dayOfMonth - 6, dayOfWeek, startTime, untilTime, status);
2468 }
2469 }
2470
2471 /*
2472 * Write the final time zone rule using RRULE, with no UNTIL attribute
2473 */
2474 void
writeFinalRule(VTZWriter & writer,UBool isDst,const AnnualTimeZoneRule * rule,int32_t fromRawOffset,int32_t fromDSTSavings,UDate startTime,UErrorCode & status) const2475 VTimeZone::writeFinalRule(VTZWriter& writer, UBool isDst, const AnnualTimeZoneRule* rule,
2476 int32_t fromRawOffset, int32_t fromDSTSavings,
2477 UDate startTime, UErrorCode& status) const {
2478 if (U_FAILURE(status)) {
2479 return;
2480 }
2481 UBool modifiedRule = TRUE;
2482 const DateTimeRule *dtrule = toWallTimeRule(rule->getRule(), fromRawOffset, fromDSTSavings);
2483 if (dtrule == NULL) {
2484 modifiedRule = FALSE;
2485 dtrule = rule->getRule();
2486 }
2487
2488 // If the rule's mills in a day is out of range, adjust start time.
2489 // Olson tzdata supports 24:00 of a day, but VTIMEZONE does not.
2490 // See ticket#7008/#7518
2491
2492 int32_t timeInDay = dtrule->getRuleMillisInDay();
2493 if (timeInDay < 0) {
2494 startTime = startTime + (0 - timeInDay);
2495 } else if (timeInDay >= U_MILLIS_PER_DAY) {
2496 startTime = startTime - (timeInDay - (U_MILLIS_PER_DAY - 1));
2497 }
2498
2499 int32_t toOffset = rule->getRawOffset() + rule->getDSTSavings();
2500 UnicodeString name;
2501 rule->getName(name);
2502 switch (dtrule->getDateRuleType()) {
2503 case DateTimeRule::DOM:
2504 writeZonePropsByDOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2505 dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), startTime, MAX_MILLIS, status);
2506 break;
2507 case DateTimeRule::DOW:
2508 writeZonePropsByDOW(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2509 dtrule->getRuleMonth(), dtrule->getRuleWeekInMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
2510 break;
2511 case DateTimeRule::DOW_GEQ_DOM:
2512 writeZonePropsByDOW_GEQ_DOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2513 dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
2514 break;
2515 case DateTimeRule::DOW_LEQ_DOM:
2516 writeZonePropsByDOW_LEQ_DOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2517 dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
2518 break;
2519 }
2520 if (modifiedRule) {
2521 delete dtrule;
2522 }
2523 }
2524
2525 /*
2526 * Write the opening section of zone properties
2527 */
2528 void
beginZoneProps(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,UDate startTime,UErrorCode & status) const2529 VTimeZone::beginZoneProps(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2530 int32_t fromOffset, int32_t toOffset, UDate startTime, UErrorCode& status) const {
2531 if (U_FAILURE(status)) {
2532 return;
2533 }
2534 writer.write(ICAL_BEGIN);
2535 writer.write(COLON);
2536 if (isDst) {
2537 writer.write(ICAL_DAYLIGHT);
2538 } else {
2539 writer.write(ICAL_STANDARD);
2540 }
2541 writer.write(ICAL_NEWLINE);
2542
2543 UnicodeString dstr;
2544
2545 // TZOFFSETTO
2546 writer.write(ICAL_TZOFFSETTO);
2547 writer.write(COLON);
2548 millisToOffset(toOffset, dstr);
2549 writer.write(dstr);
2550 writer.write(ICAL_NEWLINE);
2551
2552 // TZOFFSETFROM
2553 writer.write(ICAL_TZOFFSETFROM);
2554 writer.write(COLON);
2555 millisToOffset(fromOffset, dstr);
2556 writer.write(dstr);
2557 writer.write(ICAL_NEWLINE);
2558
2559 // TZNAME
2560 writer.write(ICAL_TZNAME);
2561 writer.write(COLON);
2562 writer.write(zonename);
2563 writer.write(ICAL_NEWLINE);
2564
2565 // DTSTART
2566 writer.write(ICAL_DTSTART);
2567 writer.write(COLON);
2568 writer.write(getDateTimeString(startTime + fromOffset, dstr));
2569 writer.write(ICAL_NEWLINE);
2570 }
2571
2572 /*
2573 * Writes the closing section of zone properties
2574 */
2575 void
endZoneProps(VTZWriter & writer,UBool isDst,UErrorCode & status) const2576 VTimeZone::endZoneProps(VTZWriter& writer, UBool isDst, UErrorCode& status) const {
2577 if (U_FAILURE(status)) {
2578 return;
2579 }
2580 // END:STANDARD or END:DAYLIGHT
2581 writer.write(ICAL_END);
2582 writer.write(COLON);
2583 if (isDst) {
2584 writer.write(ICAL_DAYLIGHT);
2585 } else {
2586 writer.write(ICAL_STANDARD);
2587 }
2588 writer.write(ICAL_NEWLINE);
2589 }
2590
2591 /*
2592 * Write the beggining part of RRULE line
2593 */
2594 void
beginRRULE(VTZWriter & writer,int32_t month,UErrorCode & status) const2595 VTimeZone::beginRRULE(VTZWriter& writer, int32_t month, UErrorCode& status) const {
2596 if (U_FAILURE(status)) {
2597 return;
2598 }
2599 UnicodeString dstr;
2600 writer.write(ICAL_RRULE);
2601 writer.write(COLON);
2602 writer.write(ICAL_FREQ);
2603 writer.write(EQUALS_SIGN);
2604 writer.write(ICAL_YEARLY);
2605 writer.write(SEMICOLON);
2606 writer.write(ICAL_BYMONTH);
2607 writer.write(EQUALS_SIGN);
2608 appendAsciiDigits(month + 1, 0, dstr);
2609 writer.write(dstr);
2610 writer.write(SEMICOLON);
2611 }
2612
2613 /*
2614 * Append the UNTIL attribute after RRULE line
2615 */
2616 void
appendUNTIL(VTZWriter & writer,const UnicodeString & until,UErrorCode & status) const2617 VTimeZone::appendUNTIL(VTZWriter& writer, const UnicodeString& until, UErrorCode& status) const {
2618 if (U_FAILURE(status)) {
2619 return;
2620 }
2621 if (until.length() > 0) {
2622 writer.write(SEMICOLON);
2623 writer.write(ICAL_UNTIL);
2624 writer.write(EQUALS_SIGN);
2625 writer.write(until);
2626 }
2627 }
2628
2629 U_NAMESPACE_END
2630
2631 #endif /* #if !UCONFIG_NO_FORMATTING */
2632
2633 //eof
2634