1 // Copyright (C) 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 = 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 = (BasicTimeZone*)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 = (BasicTimeZone*)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 = (BasicTimeZone *)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 TimeZone*
clone(void) const1181 VTimeZone::clone(void) 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 UVector *customProps = NULL;
1751 if (olsonzid.length() > 0 && icutzver.length() > 0) {
1752 customProps = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, status);
1753 if (U_FAILURE(status)) {
1754 return;
1755 }
1756 UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
1757 icutzprop->append(olsonzid);
1758 icutzprop->append((UChar)0x005B/*'['*/);
1759 icutzprop->append(icutzver);
1760 icutzprop->append((UChar)0x005D/*']'*/);
1761 customProps->addElement(icutzprop, status);
1762 if (U_FAILURE(status)) {
1763 delete icutzprop;
1764 delete customProps;
1765 return;
1766 }
1767 }
1768 writeZone(writer, *tz, customProps, status);
1769 delete customProps;
1770 }
1771 }
1772
1773 void
write(UDate start,VTZWriter & writer,UErrorCode & status) const1774 VTimeZone::write(UDate start, VTZWriter& writer, UErrorCode& status) const {
1775 if (U_FAILURE(status)) {
1776 return;
1777 }
1778 InitialTimeZoneRule *initial = NULL;
1779 UVector *transitionRules = NULL;
1780 UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
1781 UnicodeString tzid;
1782
1783 // Extract rules applicable to dates after the start time
1784 getTimeZoneRulesAfter(start, initial, transitionRules, status);
1785 if (U_FAILURE(status)) {
1786 return;
1787 }
1788
1789 // Create a RuleBasedTimeZone with the subset rule
1790 getID(tzid);
1791 RuleBasedTimeZone rbtz(tzid, initial);
1792 if (transitionRules != NULL) {
1793 while (!transitionRules->isEmpty()) {
1794 TimeZoneRule *tr = (TimeZoneRule*)transitionRules->orphanElementAt(0);
1795 rbtz.addTransitionRule(tr, status);
1796 if (U_FAILURE(status)) {
1797 goto cleanupWritePartial;
1798 }
1799 }
1800 delete transitionRules;
1801 transitionRules = NULL;
1802 }
1803 rbtz.complete(status);
1804 if (U_FAILURE(status)) {
1805 goto cleanupWritePartial;
1806 }
1807
1808 if (olsonzid.length() > 0 && icutzver.length() > 0) {
1809 UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
1810 icutzprop->append(olsonzid);
1811 icutzprop->append((UChar)0x005B/*'['*/);
1812 icutzprop->append(icutzver);
1813 icutzprop->append(ICU_TZINFO_PARTIAL, -1);
1814 appendMillis(start, *icutzprop);
1815 icutzprop->append((UChar)0x005D/*']'*/);
1816 customProps.addElement(icutzprop, status);
1817 if (U_FAILURE(status)) {
1818 delete icutzprop;
1819 goto cleanupWritePartial;
1820 }
1821 }
1822 writeZone(writer, rbtz, &customProps, status);
1823 return;
1824
1825 cleanupWritePartial:
1826 if (initial != NULL) {
1827 delete initial;
1828 }
1829 if (transitionRules != NULL) {
1830 while (!transitionRules->isEmpty()) {
1831 TimeZoneRule *tr = (TimeZoneRule*)transitionRules->orphanElementAt(0);
1832 delete tr;
1833 }
1834 delete transitionRules;
1835 }
1836 }
1837
1838 void
writeSimple(UDate time,VTZWriter & writer,UErrorCode & status) const1839 VTimeZone::writeSimple(UDate time, VTZWriter& writer, UErrorCode& status) const {
1840 if (U_FAILURE(status)) {
1841 return;
1842 }
1843
1844 UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
1845 UnicodeString tzid;
1846
1847 // Extract simple rules
1848 InitialTimeZoneRule *initial = NULL;
1849 AnnualTimeZoneRule *std = NULL, *dst = NULL;
1850 getSimpleRulesNear(time, initial, std, dst, status);
1851 if (U_SUCCESS(status)) {
1852 // Create a RuleBasedTimeZone with the subset rule
1853 getID(tzid);
1854 RuleBasedTimeZone rbtz(tzid, initial);
1855 if (std != NULL && dst != NULL) {
1856 rbtz.addTransitionRule(std, status);
1857 rbtz.addTransitionRule(dst, status);
1858 }
1859 if (U_FAILURE(status)) {
1860 goto cleanupWriteSimple;
1861 }
1862
1863 if (olsonzid.length() > 0 && icutzver.length() > 0) {
1864 UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
1865 icutzprop->append(olsonzid);
1866 icutzprop->append((UChar)0x005B/*'['*/);
1867 icutzprop->append(icutzver);
1868 icutzprop->append(ICU_TZINFO_SIMPLE, -1);
1869 appendMillis(time, *icutzprop);
1870 icutzprop->append((UChar)0x005D/*']'*/);
1871 customProps.addElement(icutzprop, status);
1872 if (U_FAILURE(status)) {
1873 delete icutzprop;
1874 goto cleanupWriteSimple;
1875 }
1876 }
1877 writeZone(writer, rbtz, &customProps, status);
1878 }
1879 return;
1880
1881 cleanupWriteSimple:
1882 if (initial != NULL) {
1883 delete initial;
1884 }
1885 if (std != NULL) {
1886 delete std;
1887 }
1888 if (dst != NULL) {
1889 delete dst;
1890 }
1891 }
1892
1893 void
writeZone(VTZWriter & w,BasicTimeZone & basictz,UVector * customProps,UErrorCode & status) const1894 VTimeZone::writeZone(VTZWriter& w, BasicTimeZone& basictz,
1895 UVector* customProps, UErrorCode& status) const {
1896 if (U_FAILURE(status)) {
1897 return;
1898 }
1899 writeHeaders(w, status);
1900 if (U_FAILURE(status)) {
1901 return;
1902 }
1903
1904 if (customProps != NULL) {
1905 for (int32_t i = 0; i < customProps->size(); i++) {
1906 UnicodeString *custprop = (UnicodeString*)customProps->elementAt(i);
1907 w.write(*custprop);
1908 w.write(ICAL_NEWLINE);
1909 }
1910 }
1911
1912 UDate t = MIN_MILLIS;
1913 UnicodeString dstName;
1914 int32_t dstFromOffset = 0;
1915 int32_t dstFromDSTSavings = 0;
1916 int32_t dstToOffset = 0;
1917 int32_t dstStartYear = 0;
1918 int32_t dstMonth = 0;
1919 int32_t dstDayOfWeek = 0;
1920 int32_t dstWeekInMonth = 0;
1921 int32_t dstMillisInDay = 0;
1922 UDate dstStartTime = 0.0;
1923 UDate dstUntilTime = 0.0;
1924 int32_t dstCount = 0;
1925 AnnualTimeZoneRule *finalDstRule = NULL;
1926
1927 UnicodeString stdName;
1928 int32_t stdFromOffset = 0;
1929 int32_t stdFromDSTSavings = 0;
1930 int32_t stdToOffset = 0;
1931 int32_t stdStartYear = 0;
1932 int32_t stdMonth = 0;
1933 int32_t stdDayOfWeek = 0;
1934 int32_t stdWeekInMonth = 0;
1935 int32_t stdMillisInDay = 0;
1936 UDate stdStartTime = 0.0;
1937 UDate stdUntilTime = 0.0;
1938 int32_t stdCount = 0;
1939 AnnualTimeZoneRule *finalStdRule = NULL;
1940
1941 int32_t year, month, dom, dow, doy, mid;
1942 UBool hasTransitions = FALSE;
1943 TimeZoneTransition tzt;
1944 UBool tztAvail;
1945 UnicodeString name;
1946 UBool isDst;
1947
1948 // Going through all transitions
1949 while (TRUE) {
1950 tztAvail = basictz.getNextTransition(t, FALSE, tzt);
1951 if (!tztAvail) {
1952 break;
1953 }
1954 hasTransitions = TRUE;
1955 t = tzt.getTime();
1956 tzt.getTo()->getName(name);
1957 isDst = (tzt.getTo()->getDSTSavings() != 0);
1958 int32_t fromOffset = tzt.getFrom()->getRawOffset() + tzt.getFrom()->getDSTSavings();
1959 int32_t fromDSTSavings = tzt.getFrom()->getDSTSavings();
1960 int32_t toOffset = tzt.getTo()->getRawOffset() + tzt.getTo()->getDSTSavings();
1961 Grego::timeToFields(tzt.getTime() + fromOffset, year, month, dom, dow, doy, mid);
1962 int32_t weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
1963 UBool sameRule = FALSE;
1964 const AnnualTimeZoneRule *atzrule;
1965 if (isDst) {
1966 if (finalDstRule == NULL
1967 && (atzrule = dynamic_cast<const AnnualTimeZoneRule *>(tzt.getTo())) != NULL
1968 && atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR
1969 ) {
1970 finalDstRule = (AnnualTimeZoneRule*)tzt.getTo()->clone();
1971 }
1972 if (dstCount > 0) {
1973 if (year == dstStartYear + dstCount
1974 && name.compare(dstName) == 0
1975 && dstFromOffset == fromOffset
1976 && dstToOffset == toOffset
1977 && dstMonth == month
1978 && dstDayOfWeek == dow
1979 && dstWeekInMonth == weekInMonth
1980 && dstMillisInDay == mid) {
1981 // Update until time
1982 dstUntilTime = t;
1983 dstCount++;
1984 sameRule = TRUE;
1985 }
1986 if (!sameRule) {
1987 if (dstCount == 1) {
1988 writeZonePropsByTime(w, TRUE, dstName, dstFromOffset, dstToOffset, dstStartTime,
1989 TRUE, status);
1990 } else {
1991 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
1992 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
1993 }
1994 if (U_FAILURE(status)) {
1995 goto cleanupWriteZone;
1996 }
1997 }
1998 }
1999 if (!sameRule) {
2000 // Reset this DST information
2001 dstName = name;
2002 dstFromOffset = fromOffset;
2003 dstFromDSTSavings = fromDSTSavings;
2004 dstToOffset = toOffset;
2005 dstStartYear = year;
2006 dstMonth = month;
2007 dstDayOfWeek = dow;
2008 dstWeekInMonth = weekInMonth;
2009 dstMillisInDay = mid;
2010 dstStartTime = dstUntilTime = t;
2011 dstCount = 1;
2012 }
2013 if (finalStdRule != NULL && finalDstRule != NULL) {
2014 break;
2015 }
2016 } else {
2017 if (finalStdRule == NULL
2018 && (atzrule = dynamic_cast<const AnnualTimeZoneRule *>(tzt.getTo())) != NULL
2019 && atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR
2020 ) {
2021 finalStdRule = (AnnualTimeZoneRule*)tzt.getTo()->clone();
2022 }
2023 if (stdCount > 0) {
2024 if (year == stdStartYear + stdCount
2025 && name.compare(stdName) == 0
2026 && stdFromOffset == fromOffset
2027 && stdToOffset == toOffset
2028 && stdMonth == month
2029 && stdDayOfWeek == dow
2030 && stdWeekInMonth == weekInMonth
2031 && stdMillisInDay == mid) {
2032 // Update until time
2033 stdUntilTime = t;
2034 stdCount++;
2035 sameRule = TRUE;
2036 }
2037 if (!sameRule) {
2038 if (stdCount == 1) {
2039 writeZonePropsByTime(w, FALSE, stdName, stdFromOffset, stdToOffset, stdStartTime,
2040 TRUE, status);
2041 } else {
2042 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2043 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
2044 }
2045 if (U_FAILURE(status)) {
2046 goto cleanupWriteZone;
2047 }
2048 }
2049 }
2050 if (!sameRule) {
2051 // Reset this STD information
2052 stdName = name;
2053 stdFromOffset = fromOffset;
2054 stdFromDSTSavings = fromDSTSavings;
2055 stdToOffset = toOffset;
2056 stdStartYear = year;
2057 stdMonth = month;
2058 stdDayOfWeek = dow;
2059 stdWeekInMonth = weekInMonth;
2060 stdMillisInDay = mid;
2061 stdStartTime = stdUntilTime = t;
2062 stdCount = 1;
2063 }
2064 if (finalStdRule != NULL && finalDstRule != NULL) {
2065 break;
2066 }
2067 }
2068 }
2069 if (!hasTransitions) {
2070 // No transition - put a single non transition RDATE
2071 int32_t raw, dst, offset;
2072 basictz.getOffset(0.0/*any time*/, FALSE, raw, dst, status);
2073 if (U_FAILURE(status)) {
2074 goto cleanupWriteZone;
2075 }
2076 offset = raw + dst;
2077 isDst = (dst != 0);
2078 UnicodeString tzid;
2079 basictz.getID(tzid);
2080 getDefaultTZName(tzid, isDst, name);
2081 writeZonePropsByTime(w, isDst, name,
2082 offset, offset, DEF_TZSTARTTIME - offset, FALSE, status);
2083 if (U_FAILURE(status)) {
2084 goto cleanupWriteZone;
2085 }
2086 } else {
2087 if (dstCount > 0) {
2088 if (finalDstRule == NULL) {
2089 if (dstCount == 1) {
2090 writeZonePropsByTime(w, TRUE, dstName, dstFromOffset, dstToOffset, dstStartTime,
2091 TRUE, status);
2092 } else {
2093 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
2094 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
2095 }
2096 if (U_FAILURE(status)) {
2097 goto cleanupWriteZone;
2098 }
2099 } else {
2100 if (dstCount == 1) {
2101 writeFinalRule(w, TRUE, finalDstRule,
2102 dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, dstStartTime, status);
2103 } else {
2104 // Use a single rule if possible
2105 if (isEquivalentDateRule(dstMonth, dstWeekInMonth, dstDayOfWeek, finalDstRule->getRule())) {
2106 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
2107 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, MAX_MILLIS, status);
2108 } else {
2109 // Not equivalent rule - write out two different rules
2110 writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
2111 dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
2112 if (U_FAILURE(status)) {
2113 goto cleanupWriteZone;
2114 }
2115 UDate nextStart;
2116 UBool nextStartAvail = finalDstRule->getNextStart(dstUntilTime, dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, false, nextStart);
2117 U_ASSERT(nextStartAvail);
2118 if (nextStartAvail) {
2119 writeFinalRule(w, TRUE, finalDstRule,
2120 dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, nextStart, status);
2121 }
2122 }
2123 }
2124 if (U_FAILURE(status)) {
2125 goto cleanupWriteZone;
2126 }
2127 }
2128 }
2129 if (stdCount > 0) {
2130 if (finalStdRule == NULL) {
2131 if (stdCount == 1) {
2132 writeZonePropsByTime(w, FALSE, stdName, stdFromOffset, stdToOffset, stdStartTime,
2133 TRUE, status);
2134 } else {
2135 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2136 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
2137 }
2138 if (U_FAILURE(status)) {
2139 goto cleanupWriteZone;
2140 }
2141 } else {
2142 if (stdCount == 1) {
2143 writeFinalRule(w, FALSE, finalStdRule,
2144 stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, stdStartTime, status);
2145 } else {
2146 // Use a single rule if possible
2147 if (isEquivalentDateRule(stdMonth, stdWeekInMonth, stdDayOfWeek, finalStdRule->getRule())) {
2148 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2149 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, MAX_MILLIS, status);
2150 } else {
2151 // Not equivalent rule - write out two different rules
2152 writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
2153 stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
2154 if (U_FAILURE(status)) {
2155 goto cleanupWriteZone;
2156 }
2157 UDate nextStart;
2158 UBool nextStartAvail = finalStdRule->getNextStart(stdUntilTime, stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, false, nextStart);
2159 U_ASSERT(nextStartAvail);
2160 if (nextStartAvail) {
2161 writeFinalRule(w, FALSE, finalStdRule,
2162 stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, nextStart, status);
2163 }
2164 }
2165 }
2166 if (U_FAILURE(status)) {
2167 goto cleanupWriteZone;
2168 }
2169 }
2170 }
2171 }
2172 writeFooter(w, status);
2173
2174 cleanupWriteZone:
2175
2176 if (finalStdRule != NULL) {
2177 delete finalStdRule;
2178 }
2179 if (finalDstRule != NULL) {
2180 delete finalDstRule;
2181 }
2182 }
2183
2184 void
writeHeaders(VTZWriter & writer,UErrorCode & status) const2185 VTimeZone::writeHeaders(VTZWriter& writer, UErrorCode& status) const {
2186 if (U_FAILURE(status)) {
2187 return;
2188 }
2189 UnicodeString tzid;
2190 tz->getID(tzid);
2191
2192 writer.write(ICAL_BEGIN);
2193 writer.write(COLON);
2194 writer.write(ICAL_VTIMEZONE);
2195 writer.write(ICAL_NEWLINE);
2196 writer.write(ICAL_TZID);
2197 writer.write(COLON);
2198 writer.write(tzid);
2199 writer.write(ICAL_NEWLINE);
2200 if (tzurl.length() != 0) {
2201 writer.write(ICAL_TZURL);
2202 writer.write(COLON);
2203 writer.write(tzurl);
2204 writer.write(ICAL_NEWLINE);
2205 }
2206 if (lastmod != MAX_MILLIS) {
2207 UnicodeString lastmodStr;
2208 writer.write(ICAL_LASTMOD);
2209 writer.write(COLON);
2210 writer.write(getUTCDateTimeString(lastmod, lastmodStr));
2211 writer.write(ICAL_NEWLINE);
2212 }
2213 }
2214
2215 /*
2216 * Write the closing section of the VTIMEZONE definition block
2217 */
2218 void
writeFooter(VTZWriter & writer,UErrorCode & status) const2219 VTimeZone::writeFooter(VTZWriter& writer, UErrorCode& status) const {
2220 if (U_FAILURE(status)) {
2221 return;
2222 }
2223 writer.write(ICAL_END);
2224 writer.write(COLON);
2225 writer.write(ICAL_VTIMEZONE);
2226 writer.write(ICAL_NEWLINE);
2227 }
2228
2229 /*
2230 * Write a single start time
2231 */
2232 void
writeZonePropsByTime(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,UDate time,UBool withRDATE,UErrorCode & status) const2233 VTimeZone::writeZonePropsByTime(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2234 int32_t fromOffset, int32_t toOffset, UDate time, UBool withRDATE,
2235 UErrorCode& status) const {
2236 if (U_FAILURE(status)) {
2237 return;
2238 }
2239 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, time, status);
2240 if (U_FAILURE(status)) {
2241 return;
2242 }
2243 if (withRDATE) {
2244 writer.write(ICAL_RDATE);
2245 writer.write(COLON);
2246 UnicodeString timestr;
2247 writer.write(getDateTimeString(time + fromOffset, timestr));
2248 writer.write(ICAL_NEWLINE);
2249 }
2250 endZoneProps(writer, isDst, status);
2251 if (U_FAILURE(status)) {
2252 return;
2253 }
2254 }
2255
2256 /*
2257 * Write start times defined by a DOM rule using VTIMEZONE RRULE
2258 */
2259 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) const2260 VTimeZone::writeZonePropsByDOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2261 int32_t fromOffset, int32_t toOffset,
2262 int32_t month, int32_t dayOfMonth, UDate startTime, UDate untilTime,
2263 UErrorCode& status) const {
2264 if (U_FAILURE(status)) {
2265 return;
2266 }
2267 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
2268 if (U_FAILURE(status)) {
2269 return;
2270 }
2271 beginRRULE(writer, month, status);
2272 if (U_FAILURE(status)) {
2273 return;
2274 }
2275 writer.write(ICAL_BYMONTHDAY);
2276 writer.write(EQUALS_SIGN);
2277 UnicodeString dstr;
2278 appendAsciiDigits(dayOfMonth, 0, dstr);
2279 writer.write(dstr);
2280 if (untilTime != MAX_MILLIS) {
2281 appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
2282 if (U_FAILURE(status)) {
2283 return;
2284 }
2285 }
2286 writer.write(ICAL_NEWLINE);
2287 endZoneProps(writer, isDst, status);
2288 }
2289
2290 /*
2291 * Write start times defined by a DOW rule using VTIMEZONE RRULE
2292 */
2293 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) const2294 VTimeZone::writeZonePropsByDOW(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2295 int32_t fromOffset, int32_t toOffset,
2296 int32_t month, int32_t weekInMonth, int32_t dayOfWeek,
2297 UDate startTime, UDate untilTime, UErrorCode& status) const {
2298 if (U_FAILURE(status)) {
2299 return;
2300 }
2301 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
2302 if (U_FAILURE(status)) {
2303 return;
2304 }
2305 beginRRULE(writer, month, status);
2306 if (U_FAILURE(status)) {
2307 return;
2308 }
2309 writer.write(ICAL_BYDAY);
2310 writer.write(EQUALS_SIGN);
2311 UnicodeString dstr;
2312 appendAsciiDigits(weekInMonth, 0, dstr);
2313 writer.write(dstr); // -4, -3, -2, -1, 1, 2, 3, 4
2314 writer.write(ICAL_DOW_NAMES[dayOfWeek - 1]); // SU, MO, TU...
2315
2316 if (untilTime != MAX_MILLIS) {
2317 appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
2318 if (U_FAILURE(status)) {
2319 return;
2320 }
2321 }
2322 writer.write(ICAL_NEWLINE);
2323 endZoneProps(writer, isDst, status);
2324 }
2325
2326 /*
2327 * Write start times defined by a DOW_GEQ_DOM rule using VTIMEZONE RRULE
2328 */
2329 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) const2330 VTimeZone::writeZonePropsByDOW_GEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2331 int32_t fromOffset, int32_t toOffset,
2332 int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
2333 UDate startTime, UDate untilTime, UErrorCode& status) const {
2334 if (U_FAILURE(status)) {
2335 return;
2336 }
2337 // Check if this rule can be converted to DOW rule
2338 if (dayOfMonth%7 == 1) {
2339 // Can be represented by DOW rule
2340 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2341 month, (dayOfMonth + 6)/7, dayOfWeek, startTime, untilTime, status);
2342 if (U_FAILURE(status)) {
2343 return;
2344 }
2345 } else if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - dayOfMonth)%7 == 6) {
2346 // Can be represented by DOW rule with negative week number
2347 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2348 month, -1*((MONTHLENGTH[month] - dayOfMonth + 1)/7), dayOfWeek, startTime, untilTime, status);
2349 if (U_FAILURE(status)) {
2350 return;
2351 }
2352 } else {
2353 // Otherwise, use BYMONTHDAY to include all possible dates
2354 beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
2355 if (U_FAILURE(status)) {
2356 return;
2357 }
2358 // Check if all days are in the same month
2359 int32_t startDay = dayOfMonth;
2360 int32_t currentMonthDays = 7;
2361
2362 if (dayOfMonth <= 0) {
2363 // The start day is in previous month
2364 int32_t prevMonthDays = 1 - dayOfMonth;
2365 currentMonthDays -= prevMonthDays;
2366
2367 int32_t prevMonth = (month - 1) < 0 ? 11 : month - 1;
2368
2369 // Note: When a rule is separated into two, UNTIL attribute needs to be
2370 // calculated for each of them. For now, we skip this, because we basically use this method
2371 // only for final rules, which does not have the UNTIL attribute
2372 writeZonePropsByDOW_GEQ_DOM_sub(writer, prevMonth, -prevMonthDays, dayOfWeek, prevMonthDays,
2373 MAX_MILLIS /* Do not use UNTIL */, fromOffset, status);
2374 if (U_FAILURE(status)) {
2375 return;
2376 }
2377
2378 // Start from 1 for the rest
2379 startDay = 1;
2380 } else if (dayOfMonth + 6 > MONTHLENGTH[month]) {
2381 // Note: This code does not actually work well in February. For now, days in month in
2382 // non-leap year.
2383 int32_t nextMonthDays = dayOfMonth + 6 - MONTHLENGTH[month];
2384 currentMonthDays -= nextMonthDays;
2385
2386 int32_t nextMonth = (month + 1) > 11 ? 0 : month + 1;
2387
2388 writeZonePropsByDOW_GEQ_DOM_sub(writer, nextMonth, 1, dayOfWeek, nextMonthDays,
2389 MAX_MILLIS /* Do not use UNTIL */, fromOffset, status);
2390 if (U_FAILURE(status)) {
2391 return;
2392 }
2393 }
2394 writeZonePropsByDOW_GEQ_DOM_sub(writer, month, startDay, dayOfWeek, currentMonthDays,
2395 untilTime, fromOffset, status);
2396 if (U_FAILURE(status)) {
2397 return;
2398 }
2399 endZoneProps(writer, isDst, status);
2400 }
2401 }
2402
2403 /*
2404 * Called from writeZonePropsByDOW_GEQ_DOM
2405 */
2406 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) const2407 VTimeZone::writeZonePropsByDOW_GEQ_DOM_sub(VTZWriter& writer, int32_t month, int32_t dayOfMonth,
2408 int32_t dayOfWeek, int32_t numDays,
2409 UDate untilTime, int32_t fromOffset, UErrorCode& status) const {
2410
2411 if (U_FAILURE(status)) {
2412 return;
2413 }
2414 int32_t startDayNum = dayOfMonth;
2415 UBool isFeb = (month == UCAL_FEBRUARY);
2416 if (dayOfMonth < 0 && !isFeb) {
2417 // Use positive number if possible
2418 startDayNum = MONTHLENGTH[month] + dayOfMonth + 1;
2419 }
2420 beginRRULE(writer, month, status);
2421 if (U_FAILURE(status)) {
2422 return;
2423 }
2424 writer.write(ICAL_BYDAY);
2425 writer.write(EQUALS_SIGN);
2426 writer.write(ICAL_DOW_NAMES[dayOfWeek - 1]); // SU, MO, TU...
2427 writer.write(SEMICOLON);
2428 writer.write(ICAL_BYMONTHDAY);
2429 writer.write(EQUALS_SIGN);
2430
2431 UnicodeString dstr;
2432 appendAsciiDigits(startDayNum, 0, dstr);
2433 writer.write(dstr);
2434 for (int32_t i = 1; i < numDays; i++) {
2435 writer.write(COMMA);
2436 dstr.remove();
2437 appendAsciiDigits(startDayNum + i, 0, dstr);
2438 writer.write(dstr);
2439 }
2440
2441 if (untilTime != MAX_MILLIS) {
2442 appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
2443 if (U_FAILURE(status)) {
2444 return;
2445 }
2446 }
2447 writer.write(ICAL_NEWLINE);
2448 }
2449
2450 /*
2451 * Write start times defined by a DOW_LEQ_DOM rule using VTIMEZONE RRULE
2452 */
2453 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) const2454 VTimeZone::writeZonePropsByDOW_LEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2455 int32_t fromOffset, int32_t toOffset,
2456 int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
2457 UDate startTime, UDate untilTime, UErrorCode& status) const {
2458 if (U_FAILURE(status)) {
2459 return;
2460 }
2461 // Check if this rule can be converted to DOW rule
2462 if (dayOfMonth%7 == 0) {
2463 // Can be represented by DOW rule
2464 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2465 month, dayOfMonth/7, dayOfWeek, startTime, untilTime, status);
2466 } else if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - dayOfMonth)%7 == 0){
2467 // Can be represented by DOW rule with negative week number
2468 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2469 month, -1*((MONTHLENGTH[month] - dayOfMonth)/7 + 1), dayOfWeek, startTime, untilTime, status);
2470 } else if (month == UCAL_FEBRUARY && dayOfMonth == 29) {
2471 // Specical case for February
2472 writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
2473 UCAL_FEBRUARY, -1, dayOfWeek, startTime, untilTime, status);
2474 } else {
2475 // Otherwise, convert this to DOW_GEQ_DOM rule
2476 writeZonePropsByDOW_GEQ_DOM(writer, isDst, zonename, fromOffset, toOffset,
2477 month, dayOfMonth - 6, dayOfWeek, startTime, untilTime, status);
2478 }
2479 }
2480
2481 /*
2482 * Write the final time zone rule using RRULE, with no UNTIL attribute
2483 */
2484 void
writeFinalRule(VTZWriter & writer,UBool isDst,const AnnualTimeZoneRule * rule,int32_t fromRawOffset,int32_t fromDSTSavings,UDate startTime,UErrorCode & status) const2485 VTimeZone::writeFinalRule(VTZWriter& writer, UBool isDst, const AnnualTimeZoneRule* rule,
2486 int32_t fromRawOffset, int32_t fromDSTSavings,
2487 UDate startTime, UErrorCode& status) const {
2488 if (U_FAILURE(status)) {
2489 return;
2490 }
2491 UBool modifiedRule = TRUE;
2492 const DateTimeRule *dtrule = toWallTimeRule(rule->getRule(), fromRawOffset, fromDSTSavings);
2493 if (dtrule == NULL) {
2494 modifiedRule = FALSE;
2495 dtrule = rule->getRule();
2496 }
2497
2498 // If the rule's mills in a day is out of range, adjust start time.
2499 // Olson tzdata supports 24:00 of a day, but VTIMEZONE does not.
2500 // See ticket#7008/#7518
2501
2502 int32_t timeInDay = dtrule->getRuleMillisInDay();
2503 if (timeInDay < 0) {
2504 startTime = startTime + (0 - timeInDay);
2505 } else if (timeInDay >= U_MILLIS_PER_DAY) {
2506 startTime = startTime - (timeInDay - (U_MILLIS_PER_DAY - 1));
2507 }
2508
2509 int32_t toOffset = rule->getRawOffset() + rule->getDSTSavings();
2510 UnicodeString name;
2511 rule->getName(name);
2512 switch (dtrule->getDateRuleType()) {
2513 case DateTimeRule::DOM:
2514 writeZonePropsByDOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2515 dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), startTime, MAX_MILLIS, status);
2516 break;
2517 case DateTimeRule::DOW:
2518 writeZonePropsByDOW(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2519 dtrule->getRuleMonth(), dtrule->getRuleWeekInMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
2520 break;
2521 case DateTimeRule::DOW_GEQ_DOM:
2522 writeZonePropsByDOW_GEQ_DOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2523 dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
2524 break;
2525 case DateTimeRule::DOW_LEQ_DOM:
2526 writeZonePropsByDOW_LEQ_DOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
2527 dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
2528 break;
2529 }
2530 if (modifiedRule) {
2531 delete dtrule;
2532 }
2533 }
2534
2535 /*
2536 * Write the opening section of zone properties
2537 */
2538 void
beginZoneProps(VTZWriter & writer,UBool isDst,const UnicodeString & zonename,int32_t fromOffset,int32_t toOffset,UDate startTime,UErrorCode & status) const2539 VTimeZone::beginZoneProps(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
2540 int32_t fromOffset, int32_t toOffset, UDate startTime, UErrorCode& status) const {
2541 if (U_FAILURE(status)) {
2542 return;
2543 }
2544 writer.write(ICAL_BEGIN);
2545 writer.write(COLON);
2546 if (isDst) {
2547 writer.write(ICAL_DAYLIGHT);
2548 } else {
2549 writer.write(ICAL_STANDARD);
2550 }
2551 writer.write(ICAL_NEWLINE);
2552
2553 UnicodeString dstr;
2554
2555 // TZOFFSETTO
2556 writer.write(ICAL_TZOFFSETTO);
2557 writer.write(COLON);
2558 millisToOffset(toOffset, dstr);
2559 writer.write(dstr);
2560 writer.write(ICAL_NEWLINE);
2561
2562 // TZOFFSETFROM
2563 writer.write(ICAL_TZOFFSETFROM);
2564 writer.write(COLON);
2565 millisToOffset(fromOffset, dstr);
2566 writer.write(dstr);
2567 writer.write(ICAL_NEWLINE);
2568
2569 // TZNAME
2570 writer.write(ICAL_TZNAME);
2571 writer.write(COLON);
2572 writer.write(zonename);
2573 writer.write(ICAL_NEWLINE);
2574
2575 // DTSTART
2576 writer.write(ICAL_DTSTART);
2577 writer.write(COLON);
2578 writer.write(getDateTimeString(startTime + fromOffset, dstr));
2579 writer.write(ICAL_NEWLINE);
2580 }
2581
2582 /*
2583 * Writes the closing section of zone properties
2584 */
2585 void
endZoneProps(VTZWriter & writer,UBool isDst,UErrorCode & status) const2586 VTimeZone::endZoneProps(VTZWriter& writer, UBool isDst, UErrorCode& status) const {
2587 if (U_FAILURE(status)) {
2588 return;
2589 }
2590 // END:STANDARD or END:DAYLIGHT
2591 writer.write(ICAL_END);
2592 writer.write(COLON);
2593 if (isDst) {
2594 writer.write(ICAL_DAYLIGHT);
2595 } else {
2596 writer.write(ICAL_STANDARD);
2597 }
2598 writer.write(ICAL_NEWLINE);
2599 }
2600
2601 /*
2602 * Write the beggining part of RRULE line
2603 */
2604 void
beginRRULE(VTZWriter & writer,int32_t month,UErrorCode & status) const2605 VTimeZone::beginRRULE(VTZWriter& writer, int32_t month, UErrorCode& status) const {
2606 if (U_FAILURE(status)) {
2607 return;
2608 }
2609 UnicodeString dstr;
2610 writer.write(ICAL_RRULE);
2611 writer.write(COLON);
2612 writer.write(ICAL_FREQ);
2613 writer.write(EQUALS_SIGN);
2614 writer.write(ICAL_YEARLY);
2615 writer.write(SEMICOLON);
2616 writer.write(ICAL_BYMONTH);
2617 writer.write(EQUALS_SIGN);
2618 appendAsciiDigits(month + 1, 0, dstr);
2619 writer.write(dstr);
2620 writer.write(SEMICOLON);
2621 }
2622
2623 /*
2624 * Append the UNTIL attribute after RRULE line
2625 */
2626 void
appendUNTIL(VTZWriter & writer,const UnicodeString & until,UErrorCode & status) const2627 VTimeZone::appendUNTIL(VTZWriter& writer, const UnicodeString& until, UErrorCode& status) const {
2628 if (U_FAILURE(status)) {
2629 return;
2630 }
2631 if (until.length() > 0) {
2632 writer.write(SEMICOLON);
2633 writer.write(ICAL_UNTIL);
2634 writer.write(EQUALS_SIGN);
2635 writer.write(until);
2636 }
2637 }
2638
2639 U_NAMESPACE_END
2640
2641 #endif /* #if !UCONFIG_NO_FORMATTING */
2642
2643 //eof
2644