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scuffed-code/icu4c/source/i18n/vtzone.cpp
Jeff Genovy fcb9b5579a ICU-21013 Fix OOM not checked in vtzone.cpp 
Also change NULL to nullptr
2020-03-18 13:55:23 -07:00

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2007-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
#include "utypeinfo.h" // for 'typeid' to work
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/vtzone.h"
#include "unicode/rbtz.h"
#include "unicode/ucal.h"
#include "unicode/ures.h"
#include "cmemory.h"
#include "uvector.h"
#include "gregoimp.h"
#include "uassert.h"
U_NAMESPACE_BEGIN
// This is the deleter that will be use to remove TimeZoneRule
U_CDECL_BEGIN
static void U_CALLCONV
deleteTimeZoneRule(void* obj) {
delete (TimeZoneRule*) obj;
}
U_CDECL_END
// Smybol characters used by RFC2445 VTIMEZONE
static const UChar COLON = 0x3A; /* : */
static const UChar SEMICOLON = 0x3B; /* ; */
static const UChar EQUALS_SIGN = 0x3D; /* = */
static const UChar COMMA = 0x2C; /* , */
static const UChar PLUS = 0x2B; /* + */
static const UChar MINUS = 0x2D; /* - */
// RFC2445 VTIMEZONE tokens
static const UChar ICAL_BEGIN_VTIMEZONE[] = {0x42, 0x45, 0x47, 0x49, 0x4E, 0x3A, 0x56, 0x54, 0x49, 0x4D, 0x45, 0x5A, 0x4F, 0x4E, 0x45, 0}; /* "BEGIN:VTIMEZONE" */
static const UChar ICAL_END_VTIMEZONE[] = {0x45, 0x4E, 0x44, 0x3A, 0x56, 0x54, 0x49, 0x4D, 0x45, 0x5A, 0x4F, 0x4E, 0x45, 0}; /* "END:VTIMEZONE" */
static const UChar ICAL_BEGIN[] = {0x42, 0x45, 0x47, 0x49, 0x4E, 0}; /* "BEGIN" */
static const UChar ICAL_END[] = {0x45, 0x4E, 0x44, 0}; /* "END" */
static const UChar ICAL_VTIMEZONE[] = {0x56, 0x54, 0x49, 0x4D, 0x45, 0x5A, 0x4F, 0x4E, 0x45, 0}; /* "VTIMEZONE" */
static const UChar ICAL_TZID[] = {0x54, 0x5A, 0x49, 0x44, 0}; /* "TZID" */
static const UChar ICAL_STANDARD[] = {0x53, 0x54, 0x41, 0x4E, 0x44, 0x41, 0x52, 0x44, 0}; /* "STANDARD" */
static const UChar ICAL_DAYLIGHT[] = {0x44, 0x41, 0x59, 0x4C, 0x49, 0x47, 0x48, 0x54, 0}; /* "DAYLIGHT" */
static const UChar ICAL_DTSTART[] = {0x44, 0x54, 0x53, 0x54, 0x41, 0x52, 0x54, 0}; /* "DTSTART" */
static const UChar ICAL_TZOFFSETFROM[] = {0x54, 0x5A, 0x4F, 0x46, 0x46, 0x53, 0x45, 0x54, 0x46, 0x52, 0x4F, 0x4D, 0}; /* "TZOFFSETFROM" */
static const UChar ICAL_TZOFFSETTO[] = {0x54, 0x5A, 0x4F, 0x46, 0x46, 0x53, 0x45, 0x54, 0x54, 0x4F, 0}; /* "TZOFFSETTO" */
static const UChar ICAL_RDATE[] = {0x52, 0x44, 0x41, 0x54, 0x45, 0}; /* "RDATE" */
static const UChar ICAL_RRULE[] = {0x52, 0x52, 0x55, 0x4C, 0x45, 0}; /* "RRULE" */
static const UChar ICAL_TZNAME[] = {0x54, 0x5A, 0x4E, 0x41, 0x4D, 0x45, 0}; /* "TZNAME" */
static const UChar ICAL_TZURL[] = {0x54, 0x5A, 0x55, 0x52, 0x4C, 0}; /* "TZURL" */
static const UChar ICAL_LASTMOD[] = {0x4C, 0x41, 0x53, 0x54, 0x2D, 0x4D, 0x4F, 0x44, 0x49, 0x46, 0x49, 0x45, 0x44, 0}; /* "LAST-MODIFIED" */
static const UChar ICAL_FREQ[] = {0x46, 0x52, 0x45, 0x51, 0}; /* "FREQ" */
static const UChar ICAL_UNTIL[] = {0x55, 0x4E, 0x54, 0x49, 0x4C, 0}; /* "UNTIL" */
static const UChar ICAL_YEARLY[] = {0x59, 0x45, 0x41, 0x52, 0x4C, 0x59, 0}; /* "YEARLY" */
static const UChar ICAL_BYMONTH[] = {0x42, 0x59, 0x4D, 0x4F, 0x4E, 0x54, 0x48, 0}; /* "BYMONTH" */
static const UChar ICAL_BYDAY[] = {0x42, 0x59, 0x44, 0x41, 0x59, 0}; /* "BYDAY" */
static const UChar ICAL_BYMONTHDAY[] = {0x42, 0x59, 0x4D, 0x4F, 0x4E, 0x54, 0x48, 0x44, 0x41, 0x59, 0}; /* "BYMONTHDAY" */
static const UChar ICAL_NEWLINE[] = {0x0D, 0x0A, 0}; /* CRLF */
static const UChar ICAL_DOW_NAMES[7][3] = {
{0x53, 0x55, 0}, /* "SU" */
{0x4D, 0x4F, 0}, /* "MO" */
{0x54, 0x55, 0}, /* "TU" */
{0x57, 0x45, 0}, /* "WE" */
{0x54, 0x48, 0}, /* "TH" */
{0x46, 0x52, 0}, /* "FR" */
{0x53, 0x41, 0} /* "SA" */};
// Month length for non-leap year
static const int32_t MONTHLENGTH[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
// ICU custom property
static const UChar ICU_TZINFO_PROP[] = {0x58, 0x2D, 0x54, 0x5A, 0x49, 0x4E, 0x46, 0x4F, 0x3A, 0}; /* "X-TZINFO:" */
static const UChar ICU_TZINFO_PARTIAL[] = {0x2F, 0x50, 0x61, 0x72, 0x74, 0x69, 0x61, 0x6C, 0x40, 0}; /* "/Partial@" */
static const UChar ICU_TZINFO_SIMPLE[] = {0x2F, 0x53, 0x69, 0x6D, 0x70, 0x6C, 0x65, 0x40, 0}; /* "/Simple@" */
/*
* Simple fixed digit ASCII number to integer converter
*/
static int32_t parseAsciiDigits(const UnicodeString& str, int32_t start, int32_t length, UErrorCode& status) {
if (U_FAILURE(status)) {
return 0;
}
if (length <= 0 || str.length() < start || (start + length) > str.length()) {
status = U_INVALID_FORMAT_ERROR;
return 0;
}
int32_t sign = 1;
if (str.charAt(start) == PLUS) {
start++;
length--;
} else if (str.charAt(start) == MINUS) {
sign = -1;
start++;
length--;
}
int32_t num = 0;
for (int32_t i = 0; i < length; i++) {
int32_t digit = str.charAt(start + i) - 0x0030;
if (digit < 0 || digit > 9) {
status = U_INVALID_FORMAT_ERROR;
return 0;
}
num = 10 * num + digit;
}
return sign * num;
}
static UnicodeString& appendAsciiDigits(int32_t number, uint8_t length, UnicodeString& str) {
UBool negative = FALSE;
int32_t digits[10]; // max int32_t is 10 decimal digits
int32_t i;
if (number < 0) {
negative = TRUE;
number *= -1;
}
length = length > 10 ? 10 : length;
if (length == 0) {
// variable length
i = 0;
do {
digits[i++] = number % 10;
number /= 10;
} while (number != 0);
length = static_cast<uint8_t>(i);
} else {
// fixed digits
for (i = 0; i < length; i++) {
digits[i] = number % 10;
number /= 10;
}
}
if (negative) {
str.append(MINUS);
}
for (i = length - 1; i >= 0; i--) {
str.append((UChar)(digits[i] + 0x0030));
}
return str;
}
static UnicodeString& appendMillis(UDate date, UnicodeString& str) {
UBool negative = FALSE;
int32_t digits[20]; // max int64_t is 20 decimal digits
int32_t i;
int64_t number;
if (date < MIN_MILLIS) {
number = (int64_t)MIN_MILLIS;
} else if (date > MAX_MILLIS) {
number = (int64_t)MAX_MILLIS;
} else {
number = (int64_t)date;
}
if (number < 0) {
negative = TRUE;
number *= -1;
}
i = 0;
do {
digits[i++] = (int32_t)(number % 10);
number /= 10;
} while (number != 0);
if (negative) {
str.append(MINUS);
}
i--;
while (i >= 0) {
str.append((UChar)(digits[i--] + 0x0030));
}
return str;
}
/*
* Convert date/time to RFC2445 Date-Time form #1 DATE WITH LOCAL TIME
*/
static UnicodeString& getDateTimeString(UDate time, UnicodeString& str) {
int32_t year, month, dom, dow, doy, mid;
Grego::timeToFields(time, year, month, dom, dow, doy, mid);
str.remove();
appendAsciiDigits(year, 4, str);
appendAsciiDigits(month + 1, 2, str);
appendAsciiDigits(dom, 2, str);
str.append((UChar)0x0054 /*'T'*/);
int32_t t = mid;
int32_t hour = t / U_MILLIS_PER_HOUR;
t %= U_MILLIS_PER_HOUR;
int32_t min = t / U_MILLIS_PER_MINUTE;
t %= U_MILLIS_PER_MINUTE;
int32_t sec = t / U_MILLIS_PER_SECOND;
appendAsciiDigits(hour, 2, str);
appendAsciiDigits(min, 2, str);
appendAsciiDigits(sec, 2, str);
return str;
}
/*
* Convert date/time to RFC2445 Date-Time form #2 DATE WITH UTC TIME
*/
static UnicodeString& getUTCDateTimeString(UDate time, UnicodeString& str) {
getDateTimeString(time, str);
str.append((UChar)0x005A /*'Z'*/);
return str;
}
/*
* Parse RFC2445 Date-Time form #1 DATE WITH LOCAL TIME and
* #2 DATE WITH UTC TIME
*/
static UDate parseDateTimeString(const UnicodeString& str, int32_t offset, UErrorCode& status) {
if (U_FAILURE(status)) {
return 0.0;
}
int32_t year = 0, month = 0, day = 0, hour = 0, min = 0, sec = 0;
UBool isUTC = FALSE;
UBool isValid = FALSE;
do {
int length = str.length();
if (length != 15 && length != 16) {
// FORM#1 15 characters, such as "20060317T142115"
// FORM#2 16 characters, such as "20060317T142115Z"
break;
}
if (str.charAt(8) != 0x0054) {
// charcter "T" must be used for separating date and time
break;
}
if (length == 16) {
if (str.charAt(15) != 0x005A) {
// invalid format
break;
}
isUTC = TRUE;
}
year = parseAsciiDigits(str, 0, 4, status);
month = parseAsciiDigits(str, 4, 2, status) - 1; // 0-based
day = parseAsciiDigits(str, 6, 2, status);
hour = parseAsciiDigits(str, 9, 2, status);
min = parseAsciiDigits(str, 11, 2, status);
sec = parseAsciiDigits(str, 13, 2, status);
if (U_FAILURE(status)) {
break;
}
// check valid range
int32_t maxDayOfMonth = Grego::monthLength(year, month);
if (year < 0 || month < 0 || month > 11 || day < 1 || day > maxDayOfMonth ||
hour < 0 || hour >= 24 || min < 0 || min >= 60 || sec < 0 || sec >= 60) {
break;
}
isValid = TRUE;
} while(false);
if (!isValid) {
status = U_INVALID_FORMAT_ERROR;
return 0.0;
}
// Calculate the time
UDate time = Grego::fieldsToDay(year, month, day) * U_MILLIS_PER_DAY;
time += (hour * U_MILLIS_PER_HOUR + min * U_MILLIS_PER_MINUTE + sec * U_MILLIS_PER_SECOND);
if (!isUTC) {
time -= offset;
}
return time;
}
/*
* Convert RFC2445 utc-offset string to milliseconds
*/
static int32_t offsetStrToMillis(const UnicodeString& str, UErrorCode& status) {
if (U_FAILURE(status)) {
return 0;
}
UBool isValid = FALSE;
int32_t sign = 0, hour = 0, min = 0, sec = 0;
do {
int length = str.length();
if (length != 5 && length != 7) {
// utf-offset must be 5 or 7 characters
break;
}
// sign
UChar s = str.charAt(0);
if (s == PLUS) {
sign = 1;
} else if (s == MINUS) {
sign = -1;
} else {
// utf-offset must start with "+" or "-"
break;
}
hour = parseAsciiDigits(str, 1, 2, status);
min = parseAsciiDigits(str, 3, 2, status);
if (length == 7) {
sec = parseAsciiDigits(str, 5, 2, status);
}
if (U_FAILURE(status)) {
break;
}
isValid = true;
} while(false);
if (!isValid) {
status = U_INVALID_FORMAT_ERROR;
return 0;
}
int32_t millis = sign * ((hour * 60 + min) * 60 + sec) * 1000;
return millis;
}
/*
* Convert milliseconds to RFC2445 utc-offset string
*/
static void millisToOffset(int32_t millis, UnicodeString& str) {
str.remove();
if (millis >= 0) {
str.append(PLUS);
} else {
str.append(MINUS);
millis = -millis;
}
int32_t hour, min, sec;
int32_t t = millis / 1000;
sec = t % 60;
t = (t - sec) / 60;
min = t % 60;
hour = t / 60;
appendAsciiDigits(hour, 2, str);
appendAsciiDigits(min, 2, str);
appendAsciiDigits(sec, 2, str);
}
/*
* Create a default TZNAME from TZID
*/
static void getDefaultTZName(const UnicodeString &tzid, UBool isDST, UnicodeString& zonename) {
zonename = tzid;
if (isDST) {
zonename += UNICODE_STRING_SIMPLE("(DST)");
} else {
zonename += UNICODE_STRING_SIMPLE("(STD)");
}
}
/*
* Parse individual RRULE
*
* On return -
*
* month calculated by BYMONTH-1, or -1 when not found
* dow day of week in BYDAY, or 0 when not found
* wim day of week ordinal number in BYDAY, or 0 when not found
* dom an array of day of month
* domCount number of availble days in dom (domCount is specifying the size of dom on input)
* until time defined by UNTIL attribute or MIN_MILLIS if not available
*/
static void parseRRULE(const UnicodeString& rrule, int32_t& month, int32_t& dow, int32_t& wim,
int32_t* dom, int32_t& domCount, UDate& until, UErrorCode& status) {
if (U_FAILURE(status)) {
return;
}
int32_t numDom = 0;
month = -1;
dow = 0;
wim = 0;
until = MIN_MILLIS;
UBool yearly = FALSE;
//UBool parseError = FALSE;
int32_t prop_start = 0;
int32_t prop_end;
UnicodeString prop, attr, value;
UBool nextProp = TRUE;
while (nextProp) {
prop_end = rrule.indexOf(SEMICOLON, prop_start);
if (prop_end == -1) {
prop.setTo(rrule, prop_start);
nextProp = FALSE;
} else {
prop.setTo(rrule, prop_start, prop_end - prop_start);
prop_start = prop_end + 1;
}
int32_t eql = prop.indexOf(EQUALS_SIGN);
if (eql != -1) {
attr.setTo(prop, 0, eql);
value.setTo(prop, eql + 1);
} else {
goto rruleParseError;
}
if (attr.compare(ICAL_FREQ, -1) == 0) {
// only support YEARLY frequency type
if (value.compare(ICAL_YEARLY, -1) == 0) {
yearly = TRUE;
} else {
goto rruleParseError;
}
} else if (attr.compare(ICAL_UNTIL, -1) == 0) {
// ISO8601 UTC format, for example, "20060315T020000Z"
until = parseDateTimeString(value, 0, status);
if (U_FAILURE(status)) {
goto rruleParseError;
}
} else if (attr.compare(ICAL_BYMONTH, -1) == 0) {
// Note: BYMONTH may contain multiple months, but only single month make sense for
// VTIMEZONE property.
if (value.length() > 2) {
goto rruleParseError;
}
month = parseAsciiDigits(value, 0, value.length(), status) - 1;
if (U_FAILURE(status) || month < 0 || month >= 12) {
goto rruleParseError;
}
} else if (attr.compare(ICAL_BYDAY, -1) == 0) {
// Note: BYDAY may contain multiple day of week separated by comma. It is unlikely used for
// VTIMEZONE property. We do not support the case.
// 2-letter format is used just for representing a day of week, for example, "SU" for Sunday
// 3 or 4-letter format is used for represeinging Nth day of week, for example, "-1SA" for last Saturday
int32_t length = value.length();
if (length < 2 || length > 4) {
goto rruleParseError;
}
if (length > 2) {
// Nth day of week
int32_t sign = 1;
if (value.charAt(0) == PLUS) {
sign = 1;
} else if (value.charAt(0) == MINUS) {
sign = -1;
} else if (length == 4) {
goto rruleParseError;
}
int32_t n = parseAsciiDigits(value, length - 3, 1, status);
if (U_FAILURE(status) || n == 0 || n > 4) {
goto rruleParseError;
}
wim = n * sign;
value.remove(0, length - 2);
}
int32_t wday;
for (wday = 0; wday < 7; wday++) {
if (value.compare(ICAL_DOW_NAMES[wday], 2) == 0) {
break;
}
}
if (wday < 7) {
// Sunday(1) - Saturday(7)
dow = wday + 1;
} else {
goto rruleParseError;
}
} else if (attr.compare(ICAL_BYMONTHDAY, -1) == 0) {
// Note: BYMONTHDAY may contain multiple days delimitted by comma
//
// A value of BYMONTHDAY could be negative, for example, -1 means
// the last day in a month
int32_t dom_idx = 0;
int32_t dom_start = 0;
int32_t dom_end;
UBool nextDOM = TRUE;
while (nextDOM) {
dom_end = value.indexOf(COMMA, dom_start);
if (dom_end == -1) {
dom_end = value.length();
nextDOM = FALSE;
}
if (dom_idx < domCount) {
dom[dom_idx] = parseAsciiDigits(value, dom_start, dom_end - dom_start, status);
if (U_FAILURE(status)) {
goto rruleParseError;
}
dom_idx++;
} else {
status = U_BUFFER_OVERFLOW_ERROR;
goto rruleParseError;
}
dom_start = dom_end + 1;
}
numDom = dom_idx;
}
}
if (!yearly) {
// FREQ=YEARLY must be set
goto rruleParseError;
}
// Set actual number of parsed DOM (ICAL_BYMONTHDAY)
domCount = numDom;
return;
rruleParseError:
if (U_SUCCESS(status)) {
// Set error status
status = U_INVALID_FORMAT_ERROR;
}
}
static TimeZoneRule* createRuleByRRULE(const UnicodeString& zonename, int rawOffset, int dstSavings, UDate start,
UVector* dates, int fromOffset, UErrorCode& status) {
if (U_FAILURE(status)) {
return nullptr;
}
if (dates == nullptr || dates->size() == 0) {
status = U_ILLEGAL_ARGUMENT_ERROR;
return nullptr;
}
int32_t i, j;
DateTimeRule *adtr = nullptr;
// Parse the first rule
UnicodeString rrule = *((UnicodeString*)dates->elementAt(0));
int32_t month, dayOfWeek, nthDayOfWeek, dayOfMonth = 0;
int32_t days[7];
int32_t daysCount = UPRV_LENGTHOF(days);
UDate until;
parseRRULE(rrule, month, dayOfWeek, nthDayOfWeek, days, daysCount, until, status);
if (U_FAILURE(status)) {
return nullptr;
}
if (dates->size() == 1) {
// No more rules
if (daysCount > 1) {
// Multiple BYMONTHDAY values
if (daysCount != 7 || month == -1 || dayOfWeek == 0) {
// Only support the rule using 7 continuous days
// BYMONTH and BYDAY must be set at the same time
goto unsupportedRRule;
}
int32_t firstDay = 31; // max possible number of dates in a month
for (i = 0; i < 7; i++) {
// Resolve negative day numbers. A negative day number should
// not be used in February, but if we see such case, we use 28
// as the base.
if (days[i] < 0) {
days[i] = MONTHLENGTH[month] + days[i] + 1;
}
if (days[i] < firstDay) {
firstDay = days[i];
}
}
// Make sure days are continuous
for (i = 1; i < 7; i++) {
UBool found = FALSE;
for (j = 0; j < 7; j++) {
if (days[j] == firstDay + i) {
found = TRUE;
break;
}
}
if (!found) {
// days are not continuous
goto unsupportedRRule;
}
}
// Use DOW_GEQ_DOM rule with firstDay as the start date
dayOfMonth = firstDay;
}
} else {
// Check if BYMONTH + BYMONTHDAY + BYDAY rule with multiple RRULE lines.
// Otherwise, not supported.
if (month == -1 || dayOfWeek == 0 || daysCount == 0) {
// This is not the case
goto unsupportedRRule;
}
// Parse the rest of rules if number of rules is not exceeding 7.
// We can only support 7 continuous days starting from a day of month.
if (dates->size() > 7) {
goto unsupportedRRule;
}
// Note: To check valid date range across multiple rule is a little
// bit complicated. For now, this code is not doing strict range
// checking across month boundary
int32_t earliestMonth = month;
int32_t earliestDay = 31;
for (i = 0; i < daysCount; i++) {
int32_t dom = days[i];
dom = dom > 0 ? dom : MONTHLENGTH[month] + dom + 1;
earliestDay = dom < earliestDay ? dom : earliestDay;
}
int32_t anotherMonth = -1;
for (i = 1; i < dates->size(); i++) {
rrule = *((UnicodeString*)dates->elementAt(i));
UDate tmp_until;
int32_t tmp_month, tmp_dayOfWeek, tmp_nthDayOfWeek;
int32_t tmp_days[7];
int32_t tmp_daysCount = UPRV_LENGTHOF(tmp_days);
parseRRULE(rrule, tmp_month, tmp_dayOfWeek, tmp_nthDayOfWeek, tmp_days, tmp_daysCount, tmp_until, status);
if (U_FAILURE(status)) {
return nullptr;
}
// If UNTIL is newer than previous one, use the one
if (tmp_until > until) {
until = tmp_until;
}
// Check if BYMONTH + BYMONTHDAY + BYDAY rule
if (tmp_month == -1 || tmp_dayOfWeek == 0 || tmp_daysCount == 0) {
goto unsupportedRRule;
}
// Count number of BYMONTHDAY
if (daysCount + tmp_daysCount > 7) {
// We cannot support BYMONTHDAY more than 7
goto unsupportedRRule;
}
// Check if the same BYDAY is used. Otherwise, we cannot
// support the rule
if (tmp_dayOfWeek != dayOfWeek) {
goto unsupportedRRule;
}
// Check if the month is same or right next to the primary month
if (tmp_month != month) {
if (anotherMonth == -1) {
int32_t diff = tmp_month - month;
if (diff == -11 || diff == -1) {
// Previous month
anotherMonth = tmp_month;
earliestMonth = anotherMonth;
// Reset earliest day
earliestDay = 31;
} else if (diff == 11 || diff == 1) {
// Next month
anotherMonth = tmp_month;
} else {
// The day range cannot exceed more than 2 months
goto unsupportedRRule;
}
} else if (tmp_month != month && tmp_month != anotherMonth) {
// The day range cannot exceed more than 2 months
goto unsupportedRRule;
}
}
// If ealier month, go through days to find the earliest day
if (tmp_month == earliestMonth) {
for (j = 0; j < tmp_daysCount; j++) {
tmp_days[j] = tmp_days[j] > 0 ? tmp_days[j] : MONTHLENGTH[tmp_month] + tmp_days[j] + 1;
earliestDay = tmp_days[j] < earliestDay ? tmp_days[j] : earliestDay;
}
}
daysCount += tmp_daysCount;
}
if (daysCount != 7) {
// Number of BYMONTHDAY entries must be 7
goto unsupportedRRule;
}
month = earliestMonth;
dayOfMonth = earliestDay;
}
// Calculate start/end year and missing fields
int32_t startYear, startMonth, startDOM, startDOW, startDOY, startMID;
Grego::timeToFields(start + fromOffset, startYear, startMonth, startDOM,
startDOW, startDOY, startMID);
if (month == -1) {
// If BYMONTH is not set, use the month of DTSTART
month = startMonth;
}
if (dayOfWeek == 0 && nthDayOfWeek == 0 && dayOfMonth == 0) {
// If only YEARLY is set, use the day of DTSTART as BYMONTHDAY
dayOfMonth = startDOM;
}
int32_t endYear;
if (until != MIN_MILLIS) {
int32_t endMonth, endDOM, endDOW, endDOY, endMID;
Grego::timeToFields(until, endYear, endMonth, endDOM, endDOW, endDOY, endMID);
} else {
endYear = AnnualTimeZoneRule::MAX_YEAR;
}
// Create the AnnualDateTimeRule
if (dayOfWeek == 0 && nthDayOfWeek == 0 && dayOfMonth != 0) {
// Day in month rule, for example, 15th day in the month
adtr = new DateTimeRule(month, dayOfMonth, startMID, DateTimeRule::WALL_TIME);
} else if (dayOfWeek != 0 && nthDayOfWeek != 0 && dayOfMonth == 0) {
// Nth day of week rule, for example, last Sunday
adtr = new DateTimeRule(month, nthDayOfWeek, dayOfWeek, startMID, DateTimeRule::WALL_TIME);
} else if (dayOfWeek != 0 && nthDayOfWeek == 0 && dayOfMonth != 0) {
// First day of week after day of month rule, for example,
// first Sunday after 15th day in the month
adtr = new DateTimeRule(month, dayOfMonth, dayOfWeek, TRUE, startMID, DateTimeRule::WALL_TIME);
}
if (adtr == nullptr) {
goto unsupportedRRule;
}
return new AnnualTimeZoneRule(zonename, rawOffset, dstSavings, adtr, startYear, endYear);
unsupportedRRule:
status = U_INVALID_STATE_ERROR;
return nullptr;
}
/*
* Create a TimeZoneRule by the RDATE definition
*/
static TimeZoneRule* createRuleByRDATE(const UnicodeString& zonename, int32_t rawOffset, int32_t dstSavings,
UDate start, UVector* dates, int32_t fromOffset, UErrorCode& status) {
if (U_FAILURE(status)) {
return nullptr;
}
TimeArrayTimeZoneRule *retVal = nullptr;
if (dates == nullptr || dates->size() == 0) {
// When no RDATE line is provided, use start (DTSTART)
// as the transition time
retVal = new TimeArrayTimeZoneRule(zonename, rawOffset, dstSavings, &start, 1, DateTimeRule::UTC_TIME);
} else {
// Create an array of transition times
int32_t size = dates->size();
UDate* times = (UDate*)uprv_malloc(sizeof(UDate) * size);
if (times == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
return nullptr;
}
for (int32_t i = 0; i < size; i++) {
UnicodeString *datestr = (UnicodeString*)dates->elementAt(i);
times[i] = parseDateTimeString(*datestr, fromOffset, status);
if (U_FAILURE(status)) {
uprv_free(times);
return nullptr;
}
}
retVal = new TimeArrayTimeZoneRule(zonename, rawOffset, dstSavings, times, size, DateTimeRule::UTC_TIME);
uprv_free(times);
}
if (retVal == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return retVal;
}
/*
* Check if the DOW rule specified by month, weekInMonth and dayOfWeek is equivalent
* to the DateTimerule.
*/
static UBool isEquivalentDateRule(int32_t month, int32_t weekInMonth, int32_t dayOfWeek, const DateTimeRule *dtrule) {
if (month != dtrule->getRuleMonth() || dayOfWeek != dtrule->getRuleDayOfWeek()) {
return FALSE;
}
if (dtrule->getTimeRuleType() != DateTimeRule::WALL_TIME) {
// Do not try to do more intelligent comparison for now.
return FALSE;
}
if (dtrule->getDateRuleType() == DateTimeRule::DOW
&& dtrule->getRuleWeekInMonth() == weekInMonth) {
return TRUE;
}
int32_t ruleDOM = dtrule->getRuleDayOfMonth();
if (dtrule->getDateRuleType() == DateTimeRule::DOW_GEQ_DOM) {
if (ruleDOM%7 == 1 && (ruleDOM + 6)/7 == weekInMonth) {
return TRUE;
}
if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - ruleDOM)%7 == 6
&& weekInMonth == -1*((MONTHLENGTH[month]-ruleDOM+1)/7)) {
return TRUE;
}
}
if (dtrule->getDateRuleType() == DateTimeRule::DOW_LEQ_DOM) {
if (ruleDOM%7 == 0 && ruleDOM/7 == weekInMonth) {
return TRUE;
}
if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - ruleDOM)%7 == 0
&& weekInMonth == -1*((MONTHLENGTH[month] - ruleDOM)/7 + 1)) {
return TRUE;
}
}
return FALSE;
}
/*
* Convert the rule to its equivalent rule using WALL_TIME mode.
* This function returns nullptr when the specified DateTimeRule is already
* using WALL_TIME mode.
*/
static DateTimeRule *toWallTimeRule(const DateTimeRule *rule, int32_t rawOffset, int32_t dstSavings, UErrorCode &status) {
if (U_FAILURE(status)) {
return nullptr;
}
if (rule->getTimeRuleType() == DateTimeRule::WALL_TIME) {
return nullptr;
}
int32_t wallt = rule->getRuleMillisInDay();
if (rule->getTimeRuleType() == DateTimeRule::UTC_TIME) {
wallt += (rawOffset + dstSavings);
} else if (rule->getTimeRuleType() == DateTimeRule::STANDARD_TIME) {
wallt += dstSavings;
}
int32_t month = -1, dom = 0, dow = 0;
DateTimeRule::DateRuleType dtype;
int32_t dshift = 0;
if (wallt < 0) {
dshift = -1;
wallt += U_MILLIS_PER_DAY;
} else if (wallt >= U_MILLIS_PER_DAY) {
dshift = 1;
wallt -= U_MILLIS_PER_DAY;
}
month = rule->getRuleMonth();
dom = rule->getRuleDayOfMonth();
dow = rule->getRuleDayOfWeek();
dtype = rule->getDateRuleType();
if (dshift != 0) {
if (dtype == DateTimeRule::DOW) {
// Convert to DOW_GEW_DOM or DOW_LEQ_DOM rule first
int32_t wim = rule->getRuleWeekInMonth();
if (wim > 0) {
dtype = DateTimeRule::DOW_GEQ_DOM;
dom = 7 * (wim - 1) + 1;
} else {
dtype = DateTimeRule::DOW_LEQ_DOM;
dom = MONTHLENGTH[month] + 7 * (wim + 1);
}
}
// Shift one day before or after
dom += dshift;
if (dom == 0) {
month--;
month = month < UCAL_JANUARY ? UCAL_DECEMBER : month;
dom = MONTHLENGTH[month];
} else if (dom > MONTHLENGTH[month]) {
month++;
month = month > UCAL_DECEMBER ? UCAL_JANUARY : month;
dom = 1;
}
if (dtype != DateTimeRule::DOM) {
// Adjust day of week
dow += dshift;
if (dow < UCAL_SUNDAY) {
dow = UCAL_SATURDAY;
} else if (dow > UCAL_SATURDAY) {
dow = UCAL_SUNDAY;
}
}
}
// Create a new rule
DateTimeRule *modifiedRule = nullptr;
if (dtype == DateTimeRule::DOM) {
modifiedRule = new DateTimeRule(month, dom, wallt, DateTimeRule::WALL_TIME);
} else {
modifiedRule = new DateTimeRule(month, dom, dow, (dtype == DateTimeRule::DOW_GEQ_DOM), wallt, DateTimeRule::WALL_TIME);
}
if (modifiedRule == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return modifiedRule;
}
/*
* Minumum implementations of stream writer/reader, writing/reading
* UnicodeString. For now, we do not want to introduce the dependency
* on the ICU I/O stream in this module. But we want to keep the code
* equivalent to the ICU4J implementation, which utilizes java.io.Writer/
* Reader.
*/
class VTZWriter {
public:
VTZWriter(UnicodeString& out);
~VTZWriter();
void write(const UnicodeString& str);
void write(UChar ch);
void write(const UChar* str);
//void write(const UChar* str, int32_t length);
private:
UnicodeString* out;
};
VTZWriter::VTZWriter(UnicodeString& output) {
out = &output;
}
VTZWriter::~VTZWriter() {
}
void
VTZWriter::write(const UnicodeString& str) {
out->append(str);
}
void
VTZWriter::write(UChar ch) {
out->append(ch);
}
void
VTZWriter::write(const UChar* str) {
out->append(str, -1);
}
/*
void
VTZWriter::write(const UChar* str, int32_t length) {
out->append(str, length);
}
*/
class VTZReader {
public:
VTZReader(const UnicodeString& input);
~VTZReader();
UChar read(void);
private:
const UnicodeString* in;
int32_t index;
};
VTZReader::VTZReader(const UnicodeString& input) {
in = &input;
index = 0;
}
VTZReader::~VTZReader() {
}
UChar
VTZReader::read(void) {
UChar ch = 0xFFFF;
if (index < in->length()) {
ch = in->charAt(index);
}
index++;
return ch;
}
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(VTimeZone)
VTimeZone::VTimeZone()
: BasicTimeZone(), tz(nullptr), vtzlines(nullptr),
lastmod(MAX_MILLIS) {
}
VTimeZone::VTimeZone(const VTimeZone& source)
: BasicTimeZone(source), tz(nullptr), vtzlines(nullptr),
tzurl(source.tzurl), lastmod(source.lastmod),
olsonzid(source.olsonzid), icutzver(source.icutzver) {
if (source.tz != nullptr) {
tz = source.tz->clone();
}
if (source.vtzlines != nullptr) {
UErrorCode status = U_ZERO_ERROR;
int32_t size = source.vtzlines->size();
vtzlines = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, size, status);
if (vtzlines == nullptr) {
return;
}
if (U_SUCCESS(status)) {
for (int32_t i = 0; i < size; i++) {
UnicodeString *line = (UnicodeString*)source.vtzlines->elementAt(i);
vtzlines->addElement(line->clone(), status);
if (U_FAILURE(status)) {
break;
}
}
}
if (U_FAILURE(status) && vtzlines != nullptr) {
delete vtzlines;
}
}
}
VTimeZone::~VTimeZone() {
if (tz != nullptr) {
delete tz;
}
if (vtzlines != nullptr) {
delete vtzlines;
}
}
VTimeZone&
VTimeZone::operator=(const VTimeZone& right) {
if (this == &right) {
return *this;
}
if (*this != right) {
BasicTimeZone::operator=(right);
if (tz != nullptr) {
delete tz;
tz = nullptr;
}
if (right.tz != nullptr) {
tz = right.tz->clone();
}
if (vtzlines != nullptr) {
delete vtzlines;
}
if (right.vtzlines != nullptr) {
UErrorCode status = U_ZERO_ERROR;
int32_t size = right.vtzlines->size();
vtzlines = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, size, status);
if (vtzlines != nullptr && U_SUCCESS(status)) {
for (int32_t i = 0; i < size; i++) {
UnicodeString *line = (UnicodeString*)right.vtzlines->elementAt(i);
vtzlines->addElement(line->clone(), status);
if (U_FAILURE(status)) {
break;
}
}
}
if (U_FAILURE(status) && vtzlines != nullptr) {
delete vtzlines;
vtzlines = nullptr;
}
}
tzurl = right.tzurl;
lastmod = right.lastmod;
olsonzid = right.olsonzid;
icutzver = right.icutzver;
}
return *this;
}
UBool
VTimeZone::operator==(const TimeZone& that) const {
if (this == &that) {
return TRUE;
}
if (typeid(*this) != typeid(that) || !BasicTimeZone::operator==(that)) {
return FALSE;
}
VTimeZone *vtz = (VTimeZone*)&that;
if (*tz == *(vtz->tz)
&& tzurl == vtz->tzurl
&& lastmod == vtz->lastmod
/* && olsonzid = that.olsonzid */
/* && icutzver = that.icutzver */) {
return TRUE;
}
return FALSE;
}
UBool
VTimeZone::operator!=(const TimeZone& that) const {
return !operator==(that);
}
VTimeZone*
VTimeZone::createVTimeZoneByID(const UnicodeString& ID) {
VTimeZone *vtz = new VTimeZone();
if (vtz == nullptr) {
return nullptr;
}
vtz->tz = (BasicTimeZone*)TimeZone::createTimeZone(ID);
vtz->tz->getID(vtz->olsonzid);
// Set ICU tzdata version
UErrorCode status = U_ZERO_ERROR;
UResourceBundle *bundle = nullptr;
const UChar* versionStr = nullptr;
int32_t len = 0;
bundle = ures_openDirect(nullptr, "zoneinfo64", &status);
versionStr = ures_getStringByKey(bundle, "TZVersion", &len, &status);
if (U_SUCCESS(status)) {
vtz->icutzver.setTo(versionStr, len);
}
ures_close(bundle);
return vtz;
}
VTimeZone*
VTimeZone::createVTimeZoneFromBasicTimeZone(const BasicTimeZone& basic_time_zone, UErrorCode &status) {
if (U_FAILURE(status)) {
return nullptr;
}
VTimeZone *vtz = new VTimeZone();
if (vtz == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
return nullptr;
}
vtz->tz = basic_time_zone.clone();
if (vtz->tz == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
delete vtz;
return nullptr;
}
vtz->tz->getID(vtz->olsonzid);
// Set ICU tzdata version
UResourceBundle *bundle = nullptr;
const UChar* versionStr = nullptr;
int32_t len = 0;
bundle = ures_openDirect(nullptr, "zoneinfo64", &status);
versionStr = ures_getStringByKey(bundle, "TZVersion", &len, &status);
if (U_SUCCESS(status)) {
vtz->icutzver.setTo(versionStr, len);
}
ures_close(bundle);
return vtz;
}
VTimeZone*
VTimeZone::createVTimeZone(const UnicodeString& vtzdata, UErrorCode& status) {
if (U_FAILURE(status)) {
return nullptr;
}
VTZReader reader(vtzdata);
VTimeZone *vtz = new VTimeZone();
if (vtz == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
return nullptr;
}
vtz->load(reader, status);
if (U_FAILURE(status)) {
delete vtz;
return nullptr;
}
return vtz;
}
UBool
VTimeZone::getTZURL(UnicodeString& url) const {
if (tzurl.length() > 0) {
url = tzurl;
return TRUE;
}
return FALSE;
}
void
VTimeZone::setTZURL(const UnicodeString& url) {
tzurl = url;
}
UBool
VTimeZone::getLastModified(UDate& lastModified) const {
if (lastmod != MAX_MILLIS) {
lastModified = lastmod;
return TRUE;
}
return FALSE;
}
void
VTimeZone::setLastModified(UDate lastModified) {
lastmod = lastModified;
}
void
VTimeZone::write(UnicodeString& result, UErrorCode& status) const {
result.remove();
VTZWriter writer(result);
write(writer, status);
}
void
VTimeZone::write(UDate start, UnicodeString& result, UErrorCode& status) const {
result.remove();
VTZWriter writer(result);
write(start, writer, status);
}
void
VTimeZone::writeSimple(UDate time, UnicodeString& result, UErrorCode& status) const {
result.remove();
VTZWriter writer(result);
writeSimple(time, writer, status);
}
VTimeZone*
VTimeZone::clone() const {
return new VTimeZone(*this);
}
int32_t
VTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const {
return tz->getOffset(era, year, month, day, dayOfWeek, millis, status);
}
int32_t
VTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
uint8_t dayOfWeek, int32_t millis,
int32_t monthLength, UErrorCode& status) const {
return tz->getOffset(era, year, month, day, dayOfWeek, millis, monthLength, status);
}
void
VTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset,
int32_t& dstOffset, UErrorCode& status) const {
return tz->getOffset(date, local, rawOffset, dstOffset, status);
}
void
VTimeZone::setRawOffset(int32_t offsetMillis) {
tz->setRawOffset(offsetMillis);
}
int32_t
VTimeZone::getRawOffset(void) const {
return tz->getRawOffset();
}
UBool
VTimeZone::useDaylightTime(void) const {
return tz->useDaylightTime();
}
UBool
VTimeZone::inDaylightTime(UDate date, UErrorCode& status) const {
return tz->inDaylightTime(date, status);
}
UBool
VTimeZone::hasSameRules(const TimeZone& other) const {
return tz->hasSameRules(other);
}
UBool
VTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
return tz->getNextTransition(base, inclusive, result);
}
UBool
VTimeZone::getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
return tz->getPreviousTransition(base, inclusive, result);
}
int32_t
VTimeZone::countTransitionRules(UErrorCode& status) const {
return tz->countTransitionRules(status);
}
void
VTimeZone::getTimeZoneRules(const InitialTimeZoneRule*& initial,
const TimeZoneRule* trsrules[], int32_t& trscount,
UErrorCode& status) const {
tz->getTimeZoneRules(initial, trsrules, trscount, status);
}
void
VTimeZone::load(VTZReader& reader, UErrorCode& status) {
vtzlines = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, DEFAULT_VTIMEZONE_LINES, status);
if (vtzlines == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
}
if (U_FAILURE(status)) {
return;
}
UBool eol = FALSE;
UBool start = FALSE;
UBool success = FALSE;
UnicodeString line;
while (TRUE) {
UChar ch = reader.read();
if (ch == 0xFFFF) {
// end of file
if (start && line.startsWith(ICAL_END_VTIMEZONE, -1)) {
LocalPointer<UnicodeString> element(new UnicodeString(line), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
vtzlines->addElement(element.getAlias(), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
element.orphan(); // on success, vtzlines owns the object.
success = TRUE;
}
break;
}
if (ch == 0x000D) {
// CR, must be followed by LF according to the definition in RFC2445
continue;
}
if (eol) {
if (ch != 0x0009 && ch != 0x0020) {
// NOT followed by TAB/SP -> new line
if (start) {
if (line.length() > 0) {
LocalPointer<UnicodeString> element(new UnicodeString(line), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
vtzlines->addElement(element.getAlias(), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
element.orphan(); // on success, vtzlines owns the object.
}
}
line.remove();
if (ch != 0x000A) {
line.append(ch);
}
}
eol = FALSE;
} else {
if (ch == 0x000A) {
// LF
eol = TRUE;
if (start) {
if (line.startsWith(ICAL_END_VTIMEZONE, -1)) {
LocalPointer<UnicodeString> element(new UnicodeString(line), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
vtzlines->addElement(element.getAlias(), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
element.orphan(); // on success, vtzlines owns the object.
success = TRUE;
break;
}
} else {
if (line.startsWith(ICAL_BEGIN_VTIMEZONE, -1)) {
LocalPointer<UnicodeString> element(new UnicodeString(line), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
vtzlines->addElement(element.getAlias(), status);
if (U_FAILURE(status)) {
goto cleanupVtzlines;
}
element.orphan(); // on success, vtzlines owns the object.
line.remove();
start = TRUE;
eol = FALSE;
}
}
} else {
line.append(ch);
}
}
}
if (!success) {
if (U_SUCCESS(status)) {
status = U_INVALID_STATE_ERROR;
}
goto cleanupVtzlines;
}
parse(status);
return;
cleanupVtzlines:
delete vtzlines;
vtzlines = nullptr;
}
// parser state
#define INI 0 // Initial state
#define VTZ 1 // In VTIMEZONE
#define TZI 2 // In STANDARD or DAYLIGHT
#define DEF_DSTSAVINGS (60*60*1000)
#define DEF_TZSTARTTIME (0.0)
void
VTimeZone::parse(UErrorCode& status) {
if (U_FAILURE(status)) {
return;
}
if (vtzlines == nullptr || vtzlines->size() == 0) {
status = U_INVALID_STATE_ERROR;
return;
}
InitialTimeZoneRule *initialRule = nullptr;
RuleBasedTimeZone *rbtz = nullptr;
// timezone ID
UnicodeString tzid;
int32_t state = INI;
int32_t n = 0;
UBool dst = FALSE; // current zone type
UnicodeString from; // current zone from offset
UnicodeString to; // current zone offset
UnicodeString zonename; // current zone name
UnicodeString dtstart; // current zone starts
UBool isRRULE = FALSE; // true if the rule is described by RRULE
int32_t initialRawOffset = 0; // initial offset
int32_t initialDSTSavings = 0; // initial offset
UDate firstStart = MAX_MILLIS; // the earliest rule start time
UnicodeString name; // RFC2445 prop name
UnicodeString value; // RFC2445 prop value
UVector *dates = nullptr; // list of RDATE or RRULE strings
UVector *rules = nullptr; // list of TimeZoneRule instances
int32_t finalRuleIdx = -1;
int32_t finalRuleCount = 0;
rules = new UVector(status);
if (rules == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
}
if (U_FAILURE(status)) {
goto cleanupParse;
}
// Set the deleter to remove TimeZoneRule vectors to avoid memory leaks due to unowned TimeZoneRules.
rules->setDeleter(deleteTimeZoneRule);
dates = new UVector(uprv_deleteUObject, uhash_compareUnicodeString, status);
if (dates == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
}
if (U_FAILURE(status)) {
goto cleanupParse;
}
for (n = 0; n < vtzlines->size(); n++) {
UnicodeString *line = (UnicodeString*)vtzlines->elementAt(n);
int32_t valueSep = line->indexOf(COLON);
if (valueSep < 0) {
continue;
}
name.setTo(*line, 0, valueSep);
value.setTo(*line, valueSep + 1);
switch (state) {
case INI:
if (name.compare(ICAL_BEGIN, -1) == 0
&& value.compare(ICAL_VTIMEZONE, -1) == 0) {
state = VTZ;
}
break;
case VTZ:
if (name.compare(ICAL_TZID, -1) == 0) {
tzid = value;
} else if (name.compare(ICAL_TZURL, -1) == 0) {
tzurl = value;
} else if (name.compare(ICAL_LASTMOD, -1) == 0) {
// Always in 'Z' format, so the offset argument for the parse method
// can be any value.
lastmod = parseDateTimeString(value, 0, status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
} else if (name.compare(ICAL_BEGIN, -1) == 0) {
UBool isDST = (value.compare(ICAL_DAYLIGHT, -1) == 0);
if (value.compare(ICAL_STANDARD, -1) == 0 || isDST) {
// tzid must be ready at this point
if (tzid.length() == 0) {
goto cleanupParse;
}
// initialize current zone properties
if (dates->size() != 0) {
dates->removeAllElements();
}
isRRULE = FALSE;
from.remove();
to.remove();
zonename.remove();
dst = isDST;
state = TZI;
} else {
// BEGIN property other than STANDARD/DAYLIGHT
// must not be there.
goto cleanupParse;
}
} else if (name.compare(ICAL_END, -1) == 0) {
break;
}
break;
case TZI:
if (name.compare(ICAL_DTSTART, -1) == 0) {
dtstart = value;
} else if (name.compare(ICAL_TZNAME, -1) == 0) {
zonename = value;
} else if (name.compare(ICAL_TZOFFSETFROM, -1) == 0) {
from = value;
} else if (name.compare(ICAL_TZOFFSETTO, -1) == 0) {
to = value;
} else if (name.compare(ICAL_RDATE, -1) == 0) {
// RDATE mixed with RRULE is not supported
if (isRRULE) {
goto cleanupParse;
}
// RDATE value may contain multiple date delimited
// by comma
UBool nextDate = TRUE;
int32_t dstart = 0;
UnicodeString *dstr = nullptr;
while (nextDate) {
int32_t dend = value.indexOf(COMMA, dstart);
if (dend == -1) {
dstr = new UnicodeString(value, dstart);
nextDate = FALSE;
} else {
dstr = new UnicodeString(value, dstart, dend - dstart);
}
if (dstr == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
} else {
dates->addElement(dstr, status);
}
if (U_FAILURE(status)) {
goto cleanupParse;
}
dstart = dend + 1;
}
} else if (name.compare(ICAL_RRULE, -1) == 0) {
// RRULE mixed with RDATE is not supported
if (!isRRULE && dates->size() != 0) {
goto cleanupParse;
}
isRRULE = true;
LocalPointer<UnicodeString> element(new UnicodeString(value), status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
dates->addElement(element.getAlias(), status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
element.orphan(); // on success, dates owns the object.
} else if (name.compare(ICAL_END, -1) == 0) {
// Mandatory properties
if (dtstart.length() == 0 || from.length() == 0 || to.length() == 0) {
goto cleanupParse;
}
// if zonename is not available, create one from tzid
if (zonename.length() == 0) {
getDefaultTZName(tzid, dst, zonename);
}
// create a time zone rule
TimeZoneRule *rule = nullptr;
int32_t fromOffset = 0;
int32_t toOffset = 0;
int32_t rawOffset = 0;
int32_t dstSavings = 0;
UDate start = 0;
// Parse TZOFFSETFROM/TZOFFSETTO
fromOffset = offsetStrToMillis(from, status);
toOffset = offsetStrToMillis(to, status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
if (dst) {
// If daylight, use the previous offset as rawoffset if positive
if (toOffset - fromOffset > 0) {
rawOffset = fromOffset;
dstSavings = toOffset - fromOffset;
} else {
// This is rare case.. just use 1 hour DST savings
rawOffset = toOffset - DEF_DSTSAVINGS;
dstSavings = DEF_DSTSAVINGS;
}
} else {
rawOffset = toOffset;
dstSavings = 0;
}
// start time
start = parseDateTimeString(dtstart, fromOffset, status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
// Create the rule
UDate actualStart = MAX_MILLIS;
if (isRRULE) {
rule = createRuleByRRULE(zonename, rawOffset, dstSavings, start, dates, fromOffset, status);
} else {
rule = createRuleByRDATE(zonename, rawOffset, dstSavings, start, dates, fromOffset, status);
}
if (U_FAILURE(status) || rule == nullptr) {
goto cleanupParse;
} else {
UBool startAvail = rule->getFirstStart(fromOffset, 0, actualStart);
if (startAvail && actualStart < firstStart) {
// save from offset information for the earliest rule
firstStart = actualStart;
// If this is STD, assume the time before this transtion
// is DST when the difference is 1 hour. This might not be
// accurate, but VTIMEZONE data does not have such info.
if (dstSavings > 0) {
initialRawOffset = fromOffset;
initialDSTSavings = 0;
} else {
if (fromOffset - toOffset == DEF_DSTSAVINGS) {
initialRawOffset = fromOffset - DEF_DSTSAVINGS;
initialDSTSavings = DEF_DSTSAVINGS;
} else {
initialRawOffset = fromOffset;
initialDSTSavings = 0;
}
}
}
}
rules->addElement(rule, status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
state = VTZ;
}
break;
}
}
// Must have at least one rule
if (rules->size() == 0) {
goto cleanupParse;
}
// Create a initial rule
getDefaultTZName(tzid, FALSE, zonename);
initialRule = new InitialTimeZoneRule(zonename, initialRawOffset, initialDSTSavings);
if (initialRule == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
goto cleanupParse;
}
// Finally, create the RuleBasedTimeZone
rbtz = new RuleBasedTimeZone(tzid, initialRule);
if (rbtz == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
goto cleanupParse;
}
initialRule = nullptr; // already adopted by RBTZ, no need to delete
for (n = 0; n < rules->size(); n++) {
TimeZoneRule *r = (TimeZoneRule*)rules->elementAt(n);
AnnualTimeZoneRule *atzrule = dynamic_cast<AnnualTimeZoneRule *>(r);
if (atzrule != nullptr) {
if (atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) {
finalRuleCount++;
finalRuleIdx = n;
}
}
}
if (finalRuleCount > 2) {
// Too many final rules
status = U_ILLEGAL_ARGUMENT_ERROR;
goto cleanupParse;
}
if (finalRuleCount == 1) {
if (rules->size() == 1) {
// Only one final rule, only governs the initial rule,
// which is already initialized, thus, we do not need to
// add this transition rule
rules->removeAllElements();
} else {
// Normalize the final rule
AnnualTimeZoneRule *finalRule = (AnnualTimeZoneRule*)rules->elementAt(finalRuleIdx);
int32_t tmpRaw = finalRule->getRawOffset();
int32_t tmpDST = finalRule->getDSTSavings();
// Find the last non-final rule
UDate finalStart, start;
finalRule->getFirstStart(initialRawOffset, initialDSTSavings, finalStart);
start = finalStart;
for (n = 0; n < rules->size(); n++) {
if (finalRuleIdx == n) {
continue;
}
TimeZoneRule *r = (TimeZoneRule*)rules->elementAt(n);
UDate lastStart;
r->getFinalStart(tmpRaw, tmpDST, lastStart);
if (lastStart > start) {
finalRule->getNextStart(lastStart,
r->getRawOffset(),
r->getDSTSavings(),
FALSE,
start);
}
}
TimeZoneRule *newRule = nullptr;
UnicodeString tznam;
if (start == finalStart) {
// Transform this into a single transition
newRule = new TimeArrayTimeZoneRule(
finalRule->getName(tznam),
finalRule->getRawOffset(),
finalRule->getDSTSavings(),
&finalStart,
1,
DateTimeRule::UTC_TIME);
} else {
// Update the end year
int32_t y, m, d, dow, doy, mid;
Grego::timeToFields(start, y, m, d, dow, doy, mid);
newRule = new AnnualTimeZoneRule(
finalRule->getName(tznam),
finalRule->getRawOffset(),
finalRule->getDSTSavings(),
*(finalRule->getRule()),
finalRule->getStartYear(),
y);
}
if (newRule == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
goto cleanupParse;
}
rules->removeElementAt(finalRuleIdx);
rules->addElement(newRule, status);
if (U_FAILURE(status)) {
delete newRule;
goto cleanupParse;
}
}
}
while (!rules->isEmpty()) {
TimeZoneRule *tzr = (TimeZoneRule*)rules->orphanElementAt(0);
rbtz->addTransitionRule(tzr, status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
}
rbtz->complete(status);
if (U_FAILURE(status)) {
goto cleanupParse;
}
delete rules;
delete dates;
tz = rbtz;
setID(tzid);
return;
cleanupParse:
if (rules != nullptr) {
while (!rules->isEmpty()) {
TimeZoneRule *r = (TimeZoneRule*)rules->orphanElementAt(0);
delete r;
}
delete rules;
}
if (dates != nullptr) {
delete dates;
}
if (initialRule != nullptr) {
delete initialRule;
}
if (rbtz != nullptr) {
delete rbtz;
}
return;
}
void
VTimeZone::write(VTZWriter& writer, UErrorCode& status) const {
if (vtzlines != nullptr) {
for (int32_t i = 0; i < vtzlines->size(); i++) {
UnicodeString *line = (UnicodeString*)vtzlines->elementAt(i);
if (line->startsWith(ICAL_TZURL, -1)
&& line->charAt(u_strlen(ICAL_TZURL)) == COLON) {
writer.write(ICAL_TZURL);
writer.write(COLON);
writer.write(tzurl);
writer.write(ICAL_NEWLINE);
} else if (line->startsWith(ICAL_LASTMOD, -1)
&& line->charAt(u_strlen(ICAL_LASTMOD)) == COLON) {
UnicodeString utcString;
writer.write(ICAL_LASTMOD);
writer.write(COLON);
writer.write(getUTCDateTimeString(lastmod, utcString));
writer.write(ICAL_NEWLINE);
} else {
writer.write(*line);
writer.write(ICAL_NEWLINE);
}
}
} else {
UnicodeString icutzprop;
UVector customProps(nullptr, uhash_compareUnicodeString, status);
if (olsonzid.length() > 0 && icutzver.length() > 0) {
icutzprop.append(olsonzid);
icutzprop.append(u'[');
icutzprop.append(icutzver);
icutzprop.append(u']');
customProps.addElement(&icutzprop, status);
}
writeZone(writer, *tz, &customProps, status);
}
}
void
VTimeZone::write(UDate start, VTZWriter& writer, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
InitialTimeZoneRule *initial = nullptr;
UVector *transitionRules = nullptr;
UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
UnicodeString tzid;
// Extract rules applicable to dates after the start time
getTimeZoneRulesAfter(start, initial, transitionRules, status);
if (U_FAILURE(status)) {
return;
}
// Create a RuleBasedTimeZone with the subset rule
getID(tzid);
RuleBasedTimeZone rbtz(tzid, initial);
if (transitionRules != nullptr) {
while (!transitionRules->isEmpty()) {
TimeZoneRule *tr = (TimeZoneRule*)transitionRules->orphanElementAt(0);
rbtz.addTransitionRule(tr, status);
if (U_FAILURE(status)) {
goto cleanupWritePartial;
}
}
delete transitionRules;
transitionRules = nullptr;
}
rbtz.complete(status);
if (U_FAILURE(status)) {
goto cleanupWritePartial;
}
if (olsonzid.length() > 0 && icutzver.length() > 0) {
UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
if (icutzprop == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
goto cleanupWritePartial;
}
icutzprop->append(olsonzid);
icutzprop->append((UChar)0x005B/*'['*/);
icutzprop->append(icutzver);
icutzprop->append(ICU_TZINFO_PARTIAL, -1);
appendMillis(start, *icutzprop);
icutzprop->append((UChar)0x005D/*']'*/);
customProps.addElement(icutzprop, status);
if (U_FAILURE(status)) {
delete icutzprop;
goto cleanupWritePartial;
}
}
writeZone(writer, rbtz, &customProps, status);
return;
cleanupWritePartial:
if (initial != nullptr) {
delete initial;
}
if (transitionRules != nullptr) {
while (!transitionRules->isEmpty()) {
TimeZoneRule *tr = (TimeZoneRule*)transitionRules->orphanElementAt(0);
delete tr;
}
delete transitionRules;
}
}
void
VTimeZone::writeSimple(UDate time, VTZWriter& writer, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
UVector customProps(uprv_deleteUObject, uhash_compareUnicodeString, status);
UnicodeString tzid;
// Extract simple rules
InitialTimeZoneRule *initial = nullptr;
AnnualTimeZoneRule *std = nullptr, *dst = nullptr;
getSimpleRulesNear(time, initial, std, dst, status);
if (U_SUCCESS(status)) {
// Create a RuleBasedTimeZone with the subset rule
getID(tzid);
RuleBasedTimeZone rbtz(tzid, initial);
if (std != nullptr && dst != nullptr) {
rbtz.addTransitionRule(std, status);
rbtz.addTransitionRule(dst, status);
}
if (U_FAILURE(status)) {
goto cleanupWriteSimple;
}
if (olsonzid.length() > 0 && icutzver.length() > 0) {
UnicodeString *icutzprop = new UnicodeString(ICU_TZINFO_PROP);
if (icutzprop == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
goto cleanupWriteSimple;
}
icutzprop->append(olsonzid);
icutzprop->append((UChar)0x005B/*'['*/);
icutzprop->append(icutzver);
icutzprop->append(ICU_TZINFO_SIMPLE, -1);
appendMillis(time, *icutzprop);
icutzprop->append((UChar)0x005D/*']'*/);
customProps.addElement(icutzprop, status);
if (U_FAILURE(status)) {
delete icutzprop;
goto cleanupWriteSimple;
}
}
writeZone(writer, rbtz, &customProps, status);
}
return;
cleanupWriteSimple:
if (initial != nullptr) {
delete initial;
}
if (std != nullptr) {
delete std;
}
if (dst != nullptr) {
delete dst;
}
}
void
VTimeZone::writeZone(VTZWriter& w, BasicTimeZone& basictz,
UVector* customProps, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
writeHeaders(w, status);
if (U_FAILURE(status)) {
return;
}
if (customProps != nullptr) {
for (int32_t i = 0; i < customProps->size(); i++) {
UnicodeString *custprop = (UnicodeString*)customProps->elementAt(i);
w.write(*custprop);
w.write(ICAL_NEWLINE);
}
}
UDate t = MIN_MILLIS;
UnicodeString dstName;
int32_t dstFromOffset = 0;
int32_t dstFromDSTSavings = 0;
int32_t dstToOffset = 0;
int32_t dstStartYear = 0;
int32_t dstMonth = 0;
int32_t dstDayOfWeek = 0;
int32_t dstWeekInMonth = 0;
int32_t dstMillisInDay = 0;
UDate dstStartTime = 0.0;
UDate dstUntilTime = 0.0;
int32_t dstCount = 0;
AnnualTimeZoneRule *finalDstRule = nullptr;
UnicodeString stdName;
int32_t stdFromOffset = 0;
int32_t stdFromDSTSavings = 0;
int32_t stdToOffset = 0;
int32_t stdStartYear = 0;
int32_t stdMonth = 0;
int32_t stdDayOfWeek = 0;
int32_t stdWeekInMonth = 0;
int32_t stdMillisInDay = 0;
UDate stdStartTime = 0.0;
UDate stdUntilTime = 0.0;
int32_t stdCount = 0;
AnnualTimeZoneRule *finalStdRule = nullptr;
int32_t year, month, dom, dow, doy, mid;
UBool hasTransitions = FALSE;
TimeZoneTransition tzt;
UBool tztAvail;
UnicodeString name;
UBool isDst;
// Going through all transitions
while (TRUE) {
tztAvail = basictz.getNextTransition(t, FALSE, tzt);
if (!tztAvail) {
break;
}
hasTransitions = TRUE;
t = tzt.getTime();
tzt.getTo()->getName(name);
isDst = (tzt.getTo()->getDSTSavings() != 0);
int32_t fromOffset = tzt.getFrom()->getRawOffset() + tzt.getFrom()->getDSTSavings();
int32_t fromDSTSavings = tzt.getFrom()->getDSTSavings();
int32_t toOffset = tzt.getTo()->getRawOffset() + tzt.getTo()->getDSTSavings();
Grego::timeToFields(tzt.getTime() + fromOffset, year, month, dom, dow, doy, mid);
int32_t weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
UBool sameRule = FALSE;
const AnnualTimeZoneRule *atzrule;
if (isDst) {
if (finalDstRule == nullptr
&& (atzrule = dynamic_cast<const AnnualTimeZoneRule *>(tzt.getTo())) != nullptr
&& atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR
) {
finalDstRule = atzrule->clone();
}
if (dstCount > 0) {
if (year == dstStartYear + dstCount
&& name.compare(dstName) == 0
&& dstFromOffset == fromOffset
&& dstToOffset == toOffset
&& dstMonth == month
&& dstDayOfWeek == dow
&& dstWeekInMonth == weekInMonth
&& dstMillisInDay == mid) {
// Update until time
dstUntilTime = t;
dstCount++;
sameRule = TRUE;
}
if (!sameRule) {
if (dstCount == 1) {
writeZonePropsByTime(w, TRUE, dstName, dstFromOffset, dstToOffset, dstStartTime,
TRUE, status);
} else {
writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
}
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
}
}
if (!sameRule) {
// Reset this DST information
dstName = name;
dstFromOffset = fromOffset;
dstFromDSTSavings = fromDSTSavings;
dstToOffset = toOffset;
dstStartYear = year;
dstMonth = month;
dstDayOfWeek = dow;
dstWeekInMonth = weekInMonth;
dstMillisInDay = mid;
dstStartTime = dstUntilTime = t;
dstCount = 1;
}
if (finalStdRule != nullptr && finalDstRule != nullptr) {
break;
}
} else {
if (finalStdRule == nullptr
&& (atzrule = dynamic_cast<const AnnualTimeZoneRule *>(tzt.getTo())) != nullptr
&& atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR
) {
finalStdRule = atzrule->clone();
}
if (stdCount > 0) {
if (year == stdStartYear + stdCount
&& name.compare(stdName) == 0
&& stdFromOffset == fromOffset
&& stdToOffset == toOffset
&& stdMonth == month
&& stdDayOfWeek == dow
&& stdWeekInMonth == weekInMonth
&& stdMillisInDay == mid) {
// Update until time
stdUntilTime = t;
stdCount++;
sameRule = TRUE;
}
if (!sameRule) {
if (stdCount == 1) {
writeZonePropsByTime(w, FALSE, stdName, stdFromOffset, stdToOffset, stdStartTime,
TRUE, status);
} else {
writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
}
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
}
}
if (!sameRule) {
// Reset this STD information
stdName = name;
stdFromOffset = fromOffset;
stdFromDSTSavings = fromDSTSavings;
stdToOffset = toOffset;
stdStartYear = year;
stdMonth = month;
stdDayOfWeek = dow;
stdWeekInMonth = weekInMonth;
stdMillisInDay = mid;
stdStartTime = stdUntilTime = t;
stdCount = 1;
}
if (finalStdRule != nullptr && finalDstRule != nullptr) {
break;
}
}
}
if (!hasTransitions) {
// No transition - put a single non transition RDATE
int32_t raw, dst, offset;
basictz.getOffset(0.0/*any time*/, FALSE, raw, dst, status);
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
offset = raw + dst;
isDst = (dst != 0);
UnicodeString tzid;
basictz.getID(tzid);
getDefaultTZName(tzid, isDst, name);
writeZonePropsByTime(w, isDst, name,
offset, offset, DEF_TZSTARTTIME - offset, FALSE, status);
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
} else {
if (dstCount > 0) {
if (finalDstRule == nullptr) {
if (dstCount == 1) {
writeZonePropsByTime(w, TRUE, dstName, dstFromOffset, dstToOffset, dstStartTime,
TRUE, status);
} else {
writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
}
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
} else {
if (dstCount == 1) {
writeFinalRule(w, TRUE, finalDstRule,
dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, dstStartTime, status);
} else {
// Use a single rule if possible
if (isEquivalentDateRule(dstMonth, dstWeekInMonth, dstDayOfWeek, finalDstRule->getRule())) {
writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, MAX_MILLIS, status);
} else {
// Not equivalent rule - write out two different rules
writeZonePropsByDOW(w, TRUE, dstName, dstFromOffset, dstToOffset,
dstMonth, dstWeekInMonth, dstDayOfWeek, dstStartTime, dstUntilTime, status);
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
UDate nextStart;
UBool nextStartAvail = finalDstRule->getNextStart(dstUntilTime, dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, false, nextStart);
U_ASSERT(nextStartAvail);
if (nextStartAvail) {
writeFinalRule(w, TRUE, finalDstRule,
dstFromOffset - dstFromDSTSavings, dstFromDSTSavings, nextStart, status);
}
}
}
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
}
}
if (stdCount > 0) {
if (finalStdRule == nullptr) {
if (stdCount == 1) {
writeZonePropsByTime(w, FALSE, stdName, stdFromOffset, stdToOffset, stdStartTime,
TRUE, status);
} else {
writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
}
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
} else {
if (stdCount == 1) {
writeFinalRule(w, FALSE, finalStdRule,
stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, stdStartTime, status);
} else {
// Use a single rule if possible
if (isEquivalentDateRule(stdMonth, stdWeekInMonth, stdDayOfWeek, finalStdRule->getRule())) {
writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, MAX_MILLIS, status);
} else {
// Not equivalent rule - write out two different rules
writeZonePropsByDOW(w, FALSE, stdName, stdFromOffset, stdToOffset,
stdMonth, stdWeekInMonth, stdDayOfWeek, stdStartTime, stdUntilTime, status);
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
UDate nextStart;
UBool nextStartAvail = finalStdRule->getNextStart(stdUntilTime, stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, false, nextStart);
U_ASSERT(nextStartAvail);
if (nextStartAvail) {
writeFinalRule(w, FALSE, finalStdRule,
stdFromOffset - stdFromDSTSavings, stdFromDSTSavings, nextStart, status);
}
}
}
if (U_FAILURE(status)) {
goto cleanupWriteZone;
}
}
}
}
writeFooter(w, status);
cleanupWriteZone:
if (finalStdRule != nullptr) {
delete finalStdRule;
}
if (finalDstRule != nullptr) {
delete finalDstRule;
}
}
void
VTimeZone::writeHeaders(VTZWriter& writer, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
UnicodeString tzid;
tz->getID(tzid);
writer.write(ICAL_BEGIN);
writer.write(COLON);
writer.write(ICAL_VTIMEZONE);
writer.write(ICAL_NEWLINE);
writer.write(ICAL_TZID);
writer.write(COLON);
writer.write(tzid);
writer.write(ICAL_NEWLINE);
if (tzurl.length() != 0) {
writer.write(ICAL_TZURL);
writer.write(COLON);
writer.write(tzurl);
writer.write(ICAL_NEWLINE);
}
if (lastmod != MAX_MILLIS) {
UnicodeString lastmodStr;
writer.write(ICAL_LASTMOD);
writer.write(COLON);
writer.write(getUTCDateTimeString(lastmod, lastmodStr));
writer.write(ICAL_NEWLINE);
}
}
/*
* Write the closing section of the VTIMEZONE definition block
*/
void
VTimeZone::writeFooter(VTZWriter& writer, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
writer.write(ICAL_END);
writer.write(COLON);
writer.write(ICAL_VTIMEZONE);
writer.write(ICAL_NEWLINE);
}
/*
* Write a single start time
*/
void
VTimeZone::writeZonePropsByTime(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset, UDate time, UBool withRDATE,
UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, time, status);
if (U_FAILURE(status)) {
return;
}
if (withRDATE) {
writer.write(ICAL_RDATE);
writer.write(COLON);
UnicodeString timestr;
writer.write(getDateTimeString(time + fromOffset, timestr));
writer.write(ICAL_NEWLINE);
}
endZoneProps(writer, isDst, status);
if (U_FAILURE(status)) {
return;
}
}
/*
* Write start times defined by a DOM rule using VTIMEZONE RRULE
*/
void
VTimeZone::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) const {
if (U_FAILURE(status)) {
return;
}
beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
if (U_FAILURE(status)) {
return;
}
beginRRULE(writer, month, status);
if (U_FAILURE(status)) {
return;
}
writer.write(ICAL_BYMONTHDAY);
writer.write(EQUALS_SIGN);
UnicodeString dstr;
appendAsciiDigits(dayOfMonth, 0, dstr);
writer.write(dstr);
if (untilTime != MAX_MILLIS) {
appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
if (U_FAILURE(status)) {
return;
}
}
writer.write(ICAL_NEWLINE);
endZoneProps(writer, isDst, status);
}
/*
* Write start times defined by a DOW rule using VTIMEZONE RRULE
*/
void
VTimeZone::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) const {
if (U_FAILURE(status)) {
return;
}
beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
if (U_FAILURE(status)) {
return;
}
beginRRULE(writer, month, status);
if (U_FAILURE(status)) {
return;
}
writer.write(ICAL_BYDAY);
writer.write(EQUALS_SIGN);
UnicodeString dstr;
appendAsciiDigits(weekInMonth, 0, dstr);
writer.write(dstr); // -4, -3, -2, -1, 1, 2, 3, 4
writer.write(ICAL_DOW_NAMES[dayOfWeek - 1]); // SU, MO, TU...
if (untilTime != MAX_MILLIS) {
appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
if (U_FAILURE(status)) {
return;
}
}
writer.write(ICAL_NEWLINE);
endZoneProps(writer, isDst, status);
}
/*
* Write start times defined by a DOW_GEQ_DOM rule using VTIMEZONE RRULE
*/
void
VTimeZone::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) const {
if (U_FAILURE(status)) {
return;
}
// Check if this rule can be converted to DOW rule
if (dayOfMonth%7 == 1) {
// Can be represented by DOW rule
writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
month, (dayOfMonth + 6)/7, dayOfWeek, startTime, untilTime, status);
if (U_FAILURE(status)) {
return;
}
} else if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - dayOfMonth)%7 == 6) {
// Can be represented by DOW rule with negative week number
writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
month, -1*((MONTHLENGTH[month] - dayOfMonth + 1)/7), dayOfWeek, startTime, untilTime, status);
if (U_FAILURE(status)) {
return;
}
} else {
// Otherwise, use BYMONTHDAY to include all possible dates
beginZoneProps(writer, isDst, zonename, fromOffset, toOffset, startTime, status);
if (U_FAILURE(status)) {
return;
}
// Check if all days are in the same month
int32_t startDay = dayOfMonth;
int32_t currentMonthDays = 7;
if (dayOfMonth <= 0) {
// The start day is in previous month
int32_t prevMonthDays = 1 - dayOfMonth;
currentMonthDays -= prevMonthDays;
int32_t prevMonth = (month - 1) < 0 ? 11 : month - 1;
// Note: When a rule is separated into two, UNTIL attribute needs to be
// calculated for each of them. For now, we skip this, because we basically use this method
// only for final rules, which does not have the UNTIL attribute
writeZonePropsByDOW_GEQ_DOM_sub(writer, prevMonth, -prevMonthDays, dayOfWeek, prevMonthDays,
MAX_MILLIS /* Do not use UNTIL */, fromOffset, status);
if (U_FAILURE(status)) {
return;
}
// Start from 1 for the rest
startDay = 1;
} else if (dayOfMonth + 6 > MONTHLENGTH[month]) {
// Note: This code does not actually work well in February. For now, days in month in
// non-leap year.
int32_t nextMonthDays = dayOfMonth + 6 - MONTHLENGTH[month];
currentMonthDays -= nextMonthDays;
int32_t nextMonth = (month + 1) > 11 ? 0 : month + 1;
writeZonePropsByDOW_GEQ_DOM_sub(writer, nextMonth, 1, dayOfWeek, nextMonthDays,
MAX_MILLIS /* Do not use UNTIL */, fromOffset, status);
if (U_FAILURE(status)) {
return;
}
}
writeZonePropsByDOW_GEQ_DOM_sub(writer, month, startDay, dayOfWeek, currentMonthDays,
untilTime, fromOffset, status);
if (U_FAILURE(status)) {
return;
}
endZoneProps(writer, isDst, status);
}
}
/*
* Called from writeZonePropsByDOW_GEQ_DOM
*/
void
VTimeZone::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) const {
if (U_FAILURE(status)) {
return;
}
int32_t startDayNum = dayOfMonth;
UBool isFeb = (month == UCAL_FEBRUARY);
if (dayOfMonth < 0 && !isFeb) {
// Use positive number if possible
startDayNum = MONTHLENGTH[month] + dayOfMonth + 1;
}
beginRRULE(writer, month, status);
if (U_FAILURE(status)) {
return;
}
writer.write(ICAL_BYDAY);
writer.write(EQUALS_SIGN);
writer.write(ICAL_DOW_NAMES[dayOfWeek - 1]); // SU, MO, TU...
writer.write(SEMICOLON);
writer.write(ICAL_BYMONTHDAY);
writer.write(EQUALS_SIGN);
UnicodeString dstr;
appendAsciiDigits(startDayNum, 0, dstr);
writer.write(dstr);
for (int32_t i = 1; i < numDays; i++) {
writer.write(COMMA);
dstr.remove();
appendAsciiDigits(startDayNum + i, 0, dstr);
writer.write(dstr);
}
if (untilTime != MAX_MILLIS) {
appendUNTIL(writer, getDateTimeString(untilTime + fromOffset, dstr), status);
if (U_FAILURE(status)) {
return;
}
}
writer.write(ICAL_NEWLINE);
}
/*
* Write start times defined by a DOW_LEQ_DOM rule using VTIMEZONE RRULE
*/
void
VTimeZone::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) const {
if (U_FAILURE(status)) {
return;
}
// Check if this rule can be converted to DOW rule
if (dayOfMonth%7 == 0) {
// Can be represented by DOW rule
writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
month, dayOfMonth/7, dayOfWeek, startTime, untilTime, status);
} else if (month != UCAL_FEBRUARY && (MONTHLENGTH[month] - dayOfMonth)%7 == 0){
// Can be represented by DOW rule with negative week number
writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
month, -1*((MONTHLENGTH[month] - dayOfMonth)/7 + 1), dayOfWeek, startTime, untilTime, status);
} else if (month == UCAL_FEBRUARY && dayOfMonth == 29) {
// Specical case for February
writeZonePropsByDOW(writer, isDst, zonename, fromOffset, toOffset,
UCAL_FEBRUARY, -1, dayOfWeek, startTime, untilTime, status);
} else {
// Otherwise, convert this to DOW_GEQ_DOM rule
writeZonePropsByDOW_GEQ_DOM(writer, isDst, zonename, fromOffset, toOffset,
month, dayOfMonth - 6, dayOfWeek, startTime, untilTime, status);
}
}
/*
* Write the final time zone rule using RRULE, with no UNTIL attribute
*/
void
VTimeZone::writeFinalRule(VTZWriter& writer, UBool isDst, const AnnualTimeZoneRule* rule,
int32_t fromRawOffset, int32_t fromDSTSavings,
UDate startTime, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
UBool modifiedRule = TRUE;
const DateTimeRule *dtrule = toWallTimeRule(rule->getRule(), fromRawOffset, fromDSTSavings, status);
if (U_FAILURE(status)) {
return;
}
if (dtrule == nullptr) {
modifiedRule = FALSE;
dtrule = rule->getRule();
}
// If the rule's mills in a day is out of range, adjust start time.
// Olson tzdata supports 24:00 of a day, but VTIMEZONE does not.
// See ticket#7008/#7518
int32_t timeInDay = dtrule->getRuleMillisInDay();
if (timeInDay < 0) {
startTime = startTime + (0 - timeInDay);
} else if (timeInDay >= U_MILLIS_PER_DAY) {
startTime = startTime - (timeInDay - (U_MILLIS_PER_DAY - 1));
}
int32_t toOffset = rule->getRawOffset() + rule->getDSTSavings();
UnicodeString name;
rule->getName(name);
switch (dtrule->getDateRuleType()) {
case DateTimeRule::DOM:
writeZonePropsByDOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), startTime, MAX_MILLIS, status);
break;
case DateTimeRule::DOW:
writeZonePropsByDOW(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
dtrule->getRuleMonth(), dtrule->getRuleWeekInMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
break;
case DateTimeRule::DOW_GEQ_DOM:
writeZonePropsByDOW_GEQ_DOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
break;
case DateTimeRule::DOW_LEQ_DOM:
writeZonePropsByDOW_LEQ_DOM(writer, isDst, name, fromRawOffset + fromDSTSavings, toOffset,
dtrule->getRuleMonth(), dtrule->getRuleDayOfMonth(), dtrule->getRuleDayOfWeek(), startTime, MAX_MILLIS, status);
break;
}
if (modifiedRule) {
delete dtrule;
}
}
/*
* Write the opening section of zone properties
*/
void
VTimeZone::beginZoneProps(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset, UDate startTime, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
writer.write(ICAL_BEGIN);
writer.write(COLON);
if (isDst) {
writer.write(ICAL_DAYLIGHT);
} else {
writer.write(ICAL_STANDARD);
}
writer.write(ICAL_NEWLINE);
UnicodeString dstr;
// TZOFFSETTO
writer.write(ICAL_TZOFFSETTO);
writer.write(COLON);
millisToOffset(toOffset, dstr);
writer.write(dstr);
writer.write(ICAL_NEWLINE);
// TZOFFSETFROM
writer.write(ICAL_TZOFFSETFROM);
writer.write(COLON);
millisToOffset(fromOffset, dstr);
writer.write(dstr);
writer.write(ICAL_NEWLINE);
// TZNAME
writer.write(ICAL_TZNAME);
writer.write(COLON);
writer.write(zonename);
writer.write(ICAL_NEWLINE);
// DTSTART
writer.write(ICAL_DTSTART);
writer.write(COLON);
writer.write(getDateTimeString(startTime + fromOffset, dstr));
writer.write(ICAL_NEWLINE);
}
/*
* Writes the closing section of zone properties
*/
void
VTimeZone::endZoneProps(VTZWriter& writer, UBool isDst, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
// END:STANDARD or END:DAYLIGHT
writer.write(ICAL_END);
writer.write(COLON);
if (isDst) {
writer.write(ICAL_DAYLIGHT);
} else {
writer.write(ICAL_STANDARD);
}
writer.write(ICAL_NEWLINE);
}
/*
* Write the beggining part of RRULE line
*/
void
VTimeZone::beginRRULE(VTZWriter& writer, int32_t month, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
UnicodeString dstr;
writer.write(ICAL_RRULE);
writer.write(COLON);
writer.write(ICAL_FREQ);
writer.write(EQUALS_SIGN);
writer.write(ICAL_YEARLY);
writer.write(SEMICOLON);
writer.write(ICAL_BYMONTH);
writer.write(EQUALS_SIGN);
appendAsciiDigits(month + 1, 0, dstr);
writer.write(dstr);
writer.write(SEMICOLON);
}
/*
* Append the UNTIL attribute after RRULE line
*/
void
VTimeZone::appendUNTIL(VTZWriter& writer, const UnicodeString& until, UErrorCode& status) const {
if (U_FAILURE(status)) {
return;
}
if (until.length() > 0) {
writer.write(SEMICOLON);
writer.write(ICAL_UNTIL);
writer.write(EQUALS_SIGN);
writer.write(until);
}
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
//eof
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