The Tor Browser: intl/icu/source/i18n/rbtz.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/rbtz.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/rbtz.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
 *******************************************************************************
 * Copyright (C) 2007-2013, 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/rbtz.h"
 #include "unicode/gregocal.h"
 #include "uvector.h"
 #include "gregoimp.h"
 #include "cmemory.h"
 #include "umutex.h"
 U_NAMESPACE_BEGIN
 /**
  * A struct representing a time zone transition
  */
 struct Transition {
     UDate time;
     TimeZoneRule* from;
     TimeZoneRule* to;
 };
 static UBool compareRules(UVector* rules1, UVector* rules2) {
     if (rules1 == NULL && rules2 == NULL) {
         return TRUE;
     } else if (rules1 == NULL || rules2 == NULL) {
         return FALSE;
     }
     int32_t size = rules1->size();
     if (size != rules2->size()) {
         return FALSE;
     }
     for (int32_t i = 0; i < size; i++) {
         TimeZoneRule *r1 = (TimeZoneRule*)rules1->elementAt(i);
         TimeZoneRule *r2 = (TimeZoneRule*)rules2->elementAt(i);
         if (*r1 != *r2) {
             return FALSE;
         }
     }
     return TRUE;
 }
 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RuleBasedTimeZone)
 RuleBasedTimeZone::RuleBasedTimeZone(const UnicodeString& id, InitialTimeZoneRule* initialRule)
 : BasicTimeZone(id), fInitialRule(initialRule), fHistoricRules(NULL), fFinalRules(NULL),
   fHistoricTransitions(NULL), fUpToDate(FALSE) {
 }
 RuleBasedTimeZone::RuleBasedTimeZone(const RuleBasedTimeZone& source)
 : BasicTimeZone(source), fInitialRule(source.fInitialRule->clone()),
   fHistoricTransitions(NULL), fUpToDate(FALSE) {
     fHistoricRules = copyRules(source.fHistoricRules);
     fFinalRules = copyRules(source.fFinalRules);
     if (source.fUpToDate) {
         UErrorCode status = U_ZERO_ERROR;
         complete(status);
     }
 }
 RuleBasedTimeZone::~RuleBasedTimeZone() {
     deleteTransitions();
     deleteRules();
 }
 RuleBasedTimeZone&
 RuleBasedTimeZone::operator=(const RuleBasedTimeZone& right) {
     if (*this != right) {
         BasicTimeZone::operator=(right);
         deleteRules();
         fInitialRule = right.fInitialRule->clone();
         fHistoricRules = copyRules(right.fHistoricRules);
         fFinalRules = copyRules(right.fFinalRules);
         deleteTransitions();
         fUpToDate = FALSE;
     }
     return *this;
 }
 UBool
 RuleBasedTimeZone::operator==(const TimeZone& that) const {
     if (this == &that) {
         return TRUE;
     }
     if (typeid(*this) != typeid(that)
         || BasicTimeZone::operator==(that) == FALSE) {
         return FALSE;
     }
     RuleBasedTimeZone *rbtz = (RuleBasedTimeZone*)&that;
     if (*fInitialRule != *(rbtz->fInitialRule)) {
         return FALSE;
     }
     if (compareRules(fHistoricRules, rbtz->fHistoricRules)
         && compareRules(fFinalRules, rbtz->fFinalRules)) {
         return TRUE;
     }
     return FALSE;
 }
 UBool
 RuleBasedTimeZone::operator!=(const TimeZone& that) const {
     return !operator==(that);
 }
 void
 RuleBasedTimeZone::addTransitionRule(TimeZoneRule* rule, UErrorCode& status) {
     if (U_FAILURE(status)) {
         return;
     }
     AnnualTimeZoneRule* atzrule = dynamic_cast<AnnualTimeZoneRule*>(rule);
     if (atzrule != NULL && atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) {
         // A final rule
         if (fFinalRules == NULL) {
             fFinalRules = new UVector(status);
             if (U_FAILURE(status)) {
                 return;
             }
         } else if (fFinalRules->size() >= 2) {
             // Cannot handle more than two final rules
             status = U_INVALID_STATE_ERROR;
             return;
         }
         fFinalRules->addElement((void*)rule, status);
     } else {
         // Non-final rule
         if (fHistoricRules == NULL) {
             fHistoricRules = new UVector(status);
             if (U_FAILURE(status)) {
                 return;
             }
         }
         fHistoricRules->addElement((void*)rule, status);
     }
     // Mark dirty, so transitions are recalculated at next complete() call
     fUpToDate = FALSE;
 }
 static UMutex gLock = U_MUTEX_INITIALIZER;
 void
 RuleBasedTimeZone::completeConst(UErrorCode& status) const {
     if (U_FAILURE(status)) {
         return;
     }
     umtx_lock(&gLock);
     if (!fUpToDate) {
         RuleBasedTimeZone *ncThis = const_cast<RuleBasedTimeZone*>(this);
         ncThis->complete(status);
     }
     umtx_unlock(&gLock);
 }
 void
 RuleBasedTimeZone::complete(UErrorCode& status) {
     if (U_FAILURE(status)) {
         return;
     }
     if (fUpToDate) {
         return;
     }
     // Make sure either no final rules or a pair of AnnualTimeZoneRules
     // are available.
     if (fFinalRules != NULL && fFinalRules->size() != 2) {
         status = U_INVALID_STATE_ERROR;
         return;
     }
     UBool *done = NULL;
     // Create a TimezoneTransition and add to the list
     if (fHistoricRules != NULL || fFinalRules != NULL) {
         TimeZoneRule *curRule = fInitialRule;
         UDate lastTransitionTime = MIN_MILLIS;
         // Build the transition array which represents historical time zone
         // transitions.
         if (fHistoricRules != NULL && fHistoricRules->size() > 0) {
             int32_t i;
             int32_t historicCount = fHistoricRules->size();
             done = (UBool*)uprv_malloc(sizeof(UBool) * historicCount);
             if (done == NULL) {
                 status = U_MEMORY_ALLOCATION_ERROR;
                 goto cleanup;
             }
             for (i = 0; i < historicCount; i++) {
                 done[i] = FALSE;
             }
             while (TRUE) {
                 int32_t curStdOffset = curRule->getRawOffset();
                 int32_t curDstSavings = curRule->getDSTSavings();
                 UDate nextTransitionTime = MAX_MILLIS;
                 TimeZoneRule *nextRule = NULL;
                 TimeZoneRule *r = NULL;
                 UBool avail;
                 UDate tt;
                 UnicodeString curName, name;
                 curRule->getName(curName);
                 for (i = 0; i < historicCount; i++) {
                     if (done[i]) {
                         continue;
                     }
                     r = (TimeZoneRule*)fHistoricRules->elementAt(i);
                     avail = r->getNextStart(lastTransitionTime, curStdOffset, curDstSavings, false, tt);
                     if (!avail) {
                         // No more transitions from this rule - skip this rule next time
                         done[i] = TRUE;
                     } else {
                         r->getName(name);
                         if (*r == *curRule ||
                             (name == curName && r->getRawOffset() == curRule->getRawOffset()
                             && r->getDSTSavings() == curRule->getDSTSavings())) {
                             continue;
                         }
                         if (tt < nextTransitionTime) {
                             nextTransitionTime = tt;
                             nextRule = r;
                         }
                     }
                 }
                 if (nextRule ==  NULL) {
                     // Check if all historic rules are done
                     UBool bDoneAll = TRUE;
                     for (int32_t j = 0; j < historicCount; j++) {
                         if (!done[j]) {
                             bDoneAll = FALSE;
                             break;
                         }
                     }
                     if (bDoneAll) {
                         break;
                     }
                 }
                 if (fFinalRules != NULL) {
                     // Check if one of final rules has earlier transition date
                     for (i = 0; i < 2 /* fFinalRules->size() */; i++) {
                         TimeZoneRule *fr = (TimeZoneRule*)fFinalRules->elementAt(i);
                         if (*fr == *curRule) {
                             continue;
                         }
                         r = (TimeZoneRule*)fFinalRules->elementAt(i);
                         avail = r->getNextStart(lastTransitionTime, curStdOffset, curDstSavings, false, tt);
                         if (avail) {
                             if (tt < nextTransitionTime) {
                                 nextTransitionTime = tt;
                                 nextRule = r;
                             }
                         }
                     }
                 }
                 if (nextRule == NULL) {
                     // Nothing more
                     break;
                 }
                 if (fHistoricTransitions == NULL) {
                     fHistoricTransitions = new UVector(status);
                     if (U_FAILURE(status)) {
                         goto cleanup;
                     }
                 }
                 Transition *trst = (Transition*)uprv_malloc(sizeof(Transition));
                 if (trst == NULL) {
                     status = U_MEMORY_ALLOCATION_ERROR;
                     goto cleanup;
                 }
                 trst->time = nextTransitionTime;
                 trst->from = curRule;
                 trst->to = nextRule;
                 fHistoricTransitions->addElement(trst, status);
                 if (U_FAILURE(status)) {
                     goto cleanup;
                 }
                 lastTransitionTime = nextTransitionTime;
                 curRule = nextRule;
             }
         }
         if (fFinalRules != NULL) {
             if (fHistoricTransitions == NULL) {
                 fHistoricTransitions = new UVector(status);
                 if (U_FAILURE(status)) {
                     goto cleanup;
                 }
             }
             // Append the first transition for each
             TimeZoneRule *rule0 = (TimeZoneRule*)fFinalRules->elementAt(0);
             TimeZoneRule *rule1 = (TimeZoneRule*)fFinalRules->elementAt(1);
             UDate tt0, tt1;
             UBool avail0 = rule0->getNextStart(lastTransitionTime, curRule->getRawOffset(), curRule->getDSTSavings(), false, tt0);
             UBool avail1 = rule1->getNextStart(lastTransitionTime, curRule->getRawOffset(), curRule->getDSTSavings(), false, tt1);
             if (!avail0 || !avail1) {
                 // Should not happen, because both rules are permanent
                 status = U_INVALID_STATE_ERROR;
                 goto cleanup;
             }
             Transition *final0 = (Transition*)uprv_malloc(sizeof(Transition));
             if (final0 == NULL) {
                 status = U_MEMORY_ALLOCATION_ERROR;
                 goto cleanup;
             }
             Transition *final1 = (Transition*)uprv_malloc(sizeof(Transition));
             if (final1 == NULL) {
                 uprv_free(final0);
                 status = U_MEMORY_ALLOCATION_ERROR;
                 goto cleanup;
             }
             if (tt0 < tt1) {
                 final0->time = tt0;
                 final0->from = curRule;
                 final0->to = rule0;
                 rule1->getNextStart(tt0, rule0->getRawOffset(), rule0->getDSTSavings(), false, final1->time);
                 final1->from = rule0;
                 final1->to = rule1;
             } else {
                 final0->time = tt1;
                 final0->from = curRule;
                 final0->to = rule1;
                 rule0->getNextStart(tt1, rule1->getRawOffset(), rule1->getDSTSavings(), false, final1->time);
                 final1->from = rule1;
                 final1->to = rule0;
             }
             fHistoricTransitions->addElement(final0, status);
             if (U_FAILURE(status)) {
                 goto cleanup;
             }
             fHistoricTransitions->addElement(final1, status);
             if (U_FAILURE(status)) {
                 goto cleanup;
             }
         }
     }
     fUpToDate = TRUE;
     if (done != NULL) {
         uprv_free(done);
     }
     return;
 cleanup:
     deleteTransitions();
     if (done != NULL) {
         uprv_free(done);
     }
     fUpToDate = FALSE;
 }
 TimeZone*
 RuleBasedTimeZone::clone(void) const {
     return new RuleBasedTimeZone(*this);
 }
 int32_t
 RuleBasedTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
                              uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const {
     if (U_FAILURE(status)) {
         return 0;
     }
     if (month < UCAL_JANUARY || month > UCAL_DECEMBER) {
         status = U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     } else {
         return getOffset(era, year, month, day, dayOfWeek, millis,
                          Grego::monthLength(year, month), status);
     }
 }
 int32_t
 RuleBasedTimeZone::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 {
     // dayOfWeek and monthLength are unused
     if (U_FAILURE(status)) {
         return 0;
     }
     if (era == GregorianCalendar::BC) {
         // Convert to extended year
         year = 1 - year;
     }
     int32_t rawOffset, dstOffset;
     UDate time = (UDate)Grego::fieldsToDay(year, month, day) * U_MILLIS_PER_DAY + millis;
     getOffsetInternal(time, TRUE, kDaylight, kStandard, rawOffset, dstOffset, status);
     if (U_FAILURE(status)) {
         return 0;
     }
     return (rawOffset + dstOffset);
 }
 void
 RuleBasedTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset,
                              int32_t& dstOffset, UErrorCode& status) const {
     getOffsetInternal(date, local, kFormer, kLatter, rawOffset, dstOffset, status);
 }
 void
 RuleBasedTimeZone::getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt,
                                       int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) const {
     getOffsetInternal(date, TRUE, nonExistingTimeOpt, duplicatedTimeOpt, rawOffset, dstOffset, status);
 }
 /*
  * The internal getOffset implementation
  */
 void
 RuleBasedTimeZone::getOffsetInternal(UDate date, UBool local,
                                      int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt,
                                      int32_t& rawOffset, int32_t& dstOffset,
                                      UErrorCode& status) const {
     rawOffset = 0;
     dstOffset = 0;
     if (U_FAILURE(status)) {
         return;
     }
     if (!fUpToDate) {
         // Transitions are not yet resolved.  We cannot do it here
         // because this method is const.  Thus, do nothing and return
         // error status.
         status = U_INVALID_STATE_ERROR;
         return;
     }
     const TimeZoneRule *rule = NULL;
     if (fHistoricTransitions == NULL) {
         rule = fInitialRule;
     } else {
         UDate tstart = getTransitionTime((Transition*)fHistoricTransitions->elementAt(0),
             local, NonExistingTimeOpt, DuplicatedTimeOpt);
         if (date < tstart) {
             rule = fInitialRule;
         } else {
             int32_t idx = fHistoricTransitions->size() - 1;
             UDate tend = getTransitionTime((Transition*)fHistoricTransitions->elementAt(idx),
                 local, NonExistingTimeOpt, DuplicatedTimeOpt);
             if (date > tend) {
                 if (fFinalRules != NULL) {
                     rule = findRuleInFinal(date, local, NonExistingTimeOpt, DuplicatedTimeOpt);
                 }
                 if (rule == NULL) {
                     // no final rules or the given time is before the first transition
                     // specified by the final rules -> use the last rule
                     rule = ((Transition*)fHistoricTransitions->elementAt(idx))->to;
                 }
             } else {
                 // Find a historical transition
                 while (idx >= 0) {
                     if (date >= getTransitionTime((Transition*)fHistoricTransitions->elementAt(idx),
                         local, NonExistingTimeOpt, DuplicatedTimeOpt)) {
                         break;
                     }
                     idx--;
                 }
                 rule = ((Transition*)fHistoricTransitions->elementAt(idx))->to;
             }
         }
     }
     if (rule != NULL) {
         rawOffset = rule->getRawOffset();
         dstOffset = rule->getDSTSavings();
     }
 }
 void
 RuleBasedTimeZone::setRawOffset(int32_t /*offsetMillis*/) {
     // We don't support this operation at this moment.
     // Nothing to do!
 }
 int32_t
 RuleBasedTimeZone::getRawOffset(void) const {
     // Note: This implementation returns standard GMT offset
     // as of current time.
     UErrorCode status = U_ZERO_ERROR;
     int32_t raw, dst;
     getOffset(uprv_getUTCtime() * U_MILLIS_PER_SECOND,
         FALSE, raw, dst, status);
     return raw;
 }
 UBool
 RuleBasedTimeZone::useDaylightTime(void) const {
     // Note: This implementation returns true when
     // daylight saving time is used as of now or
     // after the next transition.
     UErrorCode status = U_ZERO_ERROR;
     UDate now = uprv_getUTCtime() * U_MILLIS_PER_SECOND;
     int32_t raw, dst;
     getOffset(now, FALSE, raw, dst, status);
     if (dst != 0) {
         return TRUE;
     }
     // If DST is not used now, check if DST is used after the next transition
     UDate time;
     TimeZoneRule *from, *to;
     UBool avail = findNext(now, FALSE, time, from, to);
     if (avail && to->getDSTSavings() != 0) {
         return TRUE;
     }
     return FALSE;
 }
 UBool
 RuleBasedTimeZone::inDaylightTime(UDate date, UErrorCode& status) const {
     if (U_FAILURE(status)) {
         return FALSE;
     }
     int32_t raw, dst;
     getOffset(date, FALSE, raw, dst, status);
     if (dst != 0) {
         return TRUE;
     }
     return FALSE;
 }
 UBool
 RuleBasedTimeZone::hasSameRules(const TimeZone& other) const {
     if (this == &other) {
         return TRUE;
     }
     if (typeid(*this) != typeid(other)) {
         return FALSE;
     }
     const RuleBasedTimeZone& that = (const RuleBasedTimeZone&)other;
     if (*fInitialRule != *(that.fInitialRule)) {
         return FALSE;
     }
     if (compareRules(fHistoricRules, that.fHistoricRules)
         && compareRules(fFinalRules, that.fFinalRules)) {
         return TRUE;
     }
     return FALSE;
 }
 UBool
 RuleBasedTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
     UErrorCode status = U_ZERO_ERROR;
     completeConst(status);
     if (U_FAILURE(status)) {
         return FALSE;
     }
     UDate transitionTime;
     TimeZoneRule *fromRule, *toRule;
     UBool found = findNext(base, inclusive, transitionTime, fromRule, toRule);
     if (found) {
         result.setTime(transitionTime);
         result.setFrom((const TimeZoneRule&)*fromRule);
         result.setTo((const TimeZoneRule&)*toRule);
         return TRUE;
     }
     return FALSE;
 }
 UBool
 RuleBasedTimeZone::getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
     UErrorCode status = U_ZERO_ERROR;
     completeConst(status);
     if (U_FAILURE(status)) {
         return FALSE;
     }
     UDate transitionTime;
     TimeZoneRule *fromRule, *toRule;
     UBool found = findPrev(base, inclusive, transitionTime, fromRule, toRule);
     if (found) {
         result.setTime(transitionTime);
         result.setFrom((const TimeZoneRule&)*fromRule);
         result.setTo((const TimeZoneRule&)*toRule);
         return TRUE;
     }
     return FALSE;
 }
 int32_t
 RuleBasedTimeZone::countTransitionRules(UErrorCode& /*status*/) const {
     int32_t count = 0;
     if (fHistoricRules != NULL) {
         count += fHistoricRules->size();
     }
     if (fFinalRules != NULL) {
         count += fFinalRules->size();
     }
     return count;
 }
 void
 RuleBasedTimeZone::getTimeZoneRules(const InitialTimeZoneRule*& initial,
                                     const TimeZoneRule* trsrules[],
                                     int32_t& trscount,
                                     UErrorCode& status) const {
     if (U_FAILURE(status)) {
         return;
     }
     // Initial rule
     initial = fInitialRule;
     // Transition rules
     int32_t cnt = 0;
     int32_t idx;
     if (fHistoricRules != NULL && cnt < trscount) {
         int32_t historicCount = fHistoricRules->size();
         idx = 0;
         while (cnt < trscount && idx < historicCount) {
             trsrules[cnt++] = (const TimeZoneRule*)fHistoricRules->elementAt(idx++);
         }
     }
     if (fFinalRules != NULL && cnt < trscount) {
         int32_t finalCount = fFinalRules->size();
         idx = 0;
         while (cnt < trscount && idx < finalCount) {
             trsrules[cnt++] = (const TimeZoneRule*)fFinalRules->elementAt(idx++);
         }
     }
     // Set the result length
     trscount = cnt;
 }
 void
 RuleBasedTimeZone::deleteRules(void) {
     delete fInitialRule;
     fInitialRule = NULL;
     if (fHistoricRules != NULL) {
         while (!fHistoricRules->isEmpty()) {
             delete (TimeZoneRule*)(fHistoricRules->orphanElementAt(0));
         }
         delete fHistoricRules;
         fHistoricRules = NULL;
     }
     if (fFinalRules != NULL) {
         while (!fFinalRules->isEmpty()) {
             delete (AnnualTimeZoneRule*)(fFinalRules->orphanElementAt(0));
         }
         delete fFinalRules;
         fFinalRules = NULL;
     }
 }
 void
 RuleBasedTimeZone::deleteTransitions(void) {
     if (fHistoricTransitions != NULL) {
         while (!fHistoricTransitions->isEmpty()) {
             Transition *trs = (Transition*)fHistoricTransitions->orphanElementAt(0);
             uprv_free(trs);
         }
         delete fHistoricTransitions;
     }
     fHistoricTransitions = NULL;
 }
 UVector*
 RuleBasedTimeZone::copyRules(UVector* source) {
     if (source == NULL) {
         return NULL;
     }
     UErrorCode ec = U_ZERO_ERROR;
     int32_t size = source->size();
     UVector *rules = new UVector(size, ec);
     if (U_FAILURE(ec)) {
         return NULL;
     }
     int32_t i;
     for (i = 0; i < size; i++) {
         rules->addElement(((TimeZoneRule*)source->elementAt(i))->clone(), ec);
         if (U_FAILURE(ec)) {
             break;
         }
     }
     if (U_FAILURE(ec)) {
         // In case of error, clean up
         for (i = 0; i < rules->size(); i++) {
             TimeZoneRule *rule = (TimeZoneRule*)rules->orphanElementAt(i);
             delete rule;
         }
         delete rules;
         return NULL;
     }
     return rules;
 }
 TimeZoneRule*
 RuleBasedTimeZone::findRuleInFinal(UDate date, UBool local,
                                    int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const {
     if (fFinalRules == NULL) {
         return NULL;
     }
     AnnualTimeZoneRule* fr0 = (AnnualTimeZoneRule*)fFinalRules->elementAt(0);
     AnnualTimeZoneRule* fr1 = (AnnualTimeZoneRule*)fFinalRules->elementAt(1);
     if (fr0 == NULL || fr1 == NULL) {
         return NULL;
     }
     UDate start0, start1;
     UDate base;
     int32_t localDelta;
     base = date;
     if (local) {
         localDelta = getLocalDelta(fr1->getRawOffset(), fr1->getDSTSavings(),
                                    fr0->getRawOffset(), fr0->getDSTSavings(),
                                    NonExistingTimeOpt, DuplicatedTimeOpt);
         base -= localDelta;
     }
     UBool avail0 = fr0->getPreviousStart(base, fr1->getRawOffset(), fr1->getDSTSavings(), TRUE, start0);
     base = date;
     if (local) {
         localDelta = getLocalDelta(fr0->getRawOffset(), fr0->getDSTSavings(),
                                    fr1->getRawOffset(), fr1->getDSTSavings(),
                                    NonExistingTimeOpt, DuplicatedTimeOpt);
         base -= localDelta;
     }
     UBool avail1 = fr1->getPreviousStart(base, fr0->getRawOffset(), fr0->getDSTSavings(), TRUE, start1);
     if (!avail0 || !avail1) {
         if (avail0) {
             return fr0;
         } else if (avail1) {
             return fr1;
         }
         // Both rules take effect after the given time
         return NULL;
     }
     return (start0 > start1) ? fr0 : fr1;
 }
 UBool
 RuleBasedTimeZone::findNext(UDate base, UBool inclusive, UDate& transitionTime,
                             TimeZoneRule*& fromRule, TimeZoneRule*& toRule) const {
     if (fHistoricTransitions == NULL) {
         return FALSE;
     }
     UBool isFinal = FALSE;
     UBool found = FALSE;
     Transition result;
     Transition *tzt = (Transition*)fHistoricTransitions->elementAt(0);
     UDate tt = tzt->time;
     if (tt > base || (inclusive && tt == base)) {
         result = *tzt;
         found = TRUE;
     } else {
         int32_t idx = fHistoricTransitions->size() - 1;
         tzt = (Transition*)fHistoricTransitions->elementAt(idx);
         tt = tzt->time;
         if (inclusive && tt == base) {
             result = *tzt;
             found = TRUE;
         } else if (tt <= base) {
             if (fFinalRules != NULL) {
                 // Find a transion time with finalRules
                 TimeZoneRule *r0 = (TimeZoneRule*)fFinalRules->elementAt(0);
                 TimeZoneRule *r1 = (TimeZoneRule*)fFinalRules->elementAt(1);
                 UDate start0, start1;
                 UBool avail0 = r0->getNextStart(base, r1->getRawOffset(), r1->getDSTSavings(), inclusive, start0);
                 UBool avail1 = r1->getNextStart(base, r0->getRawOffset(), r0->getDSTSavings(), inclusive, start1);
                 //  avail0/avail1 should be always TRUE
                 if (!avail0 && !avail1) {
                     return FALSE;
                 }
                 if (!avail1 || start0 < start1) {
                     result.time = start0;
                     result.from = r1;
                     result.to = r0;
                 } else {
                     result.time = start1;
                     result.from = r0;
                     result.to = r1;
                 }
                 isFinal = TRUE;
                 found = TRUE;
             }
         } else {
             // Find a transition within the historic transitions
             idx--;
             Transition *prev = tzt;
             while (idx > 0) {
                 tzt = (Transition*)fHistoricTransitions->elementAt(idx);
                 tt = tzt->time;
                 if (tt < base || (!inclusive && tt == base)) {
                     break;
                 }
                 idx--;
                 prev = tzt;
             }
             result.time = prev->time;
             result.from = prev->from;
             result.to = prev->to;
             found = TRUE;
         }
     }
     if (found) {
         // For now, this implementation ignore transitions with only zone name changes.
         if (result.from->getRawOffset() == result.to->getRawOffset()
             && result.from->getDSTSavings() == result.to->getDSTSavings()) {
             if (isFinal) {
                 return FALSE;
             } else {
                 // No offset changes.  Try next one if not final
                 return findNext(result.time, FALSE /* always exclusive */,
                     transitionTime, fromRule, toRule);
             }
         }
         transitionTime = result.time;
         fromRule = result.from;
         toRule = result.to;
         return TRUE;
     }
     return FALSE;
 }
 UBool
 RuleBasedTimeZone::findPrev(UDate base, UBool inclusive, UDate& transitionTime,
                             TimeZoneRule*& fromRule, TimeZoneRule*& toRule) const {
     if (fHistoricTransitions == NULL) {
         return FALSE;
     }
     UBool found = FALSE;
     Transition result;
     Transition *tzt = (Transition*)fHistoricTransitions->elementAt(0);
     UDate tt = tzt->time;
     if (inclusive && tt == base) {
         result = *tzt;
         found = TRUE;
     } else if (tt < base) {
         int32_t idx = fHistoricTransitions->size() - 1;
         tzt = (Transition*)fHistoricTransitions->elementAt(idx);
         tt = tzt->time;
         if (inclusive && tt == base) {
             result = *tzt;
             found = TRUE;
         } else if (tt < base) {
             if (fFinalRules != NULL) {
                 // Find a transion time with finalRules
                 TimeZoneRule *r0 = (TimeZoneRule*)fFinalRules->elementAt(0);
                 TimeZoneRule *r1 = (TimeZoneRule*)fFinalRules->elementAt(1);
                 UDate start0, start1;
                 UBool avail0 = r0->getPreviousStart(base, r1->getRawOffset(), r1->getDSTSavings(), inclusive, start0);
                 UBool avail1 = r1->getPreviousStart(base, r0->getRawOffset(), r0->getDSTSavings(), inclusive, start1);
                 //  avail0/avail1 should be always TRUE
                 if (!avail0 && !avail1) {
                     return FALSE;
                 }
                 if (!avail1 || start0 > start1) {
                     result.time = start0;
                     result.from = r1;
                     result.to = r0;
                 } else {
                     result.time = start1;
                     result.from = r0;
                     result.to = r1;
                 }
             } else {
                 result = *tzt;
             }
             found = TRUE;
         } else {
             // Find a transition within the historic transitions
             idx--;
             while (idx >= 0) {
                 tzt = (Transition*)fHistoricTransitions->elementAt(idx);
                 tt = tzt->time;
                 if (tt < base || (inclusive && tt == base)) {
                     break;
                 }
                 idx--;
             }
             result = *tzt;
             found = TRUE;
         }
     }
     if (found) {
         // For now, this implementation ignore transitions with only zone name changes.
         if (result.from->getRawOffset() == result.to->getRawOffset()
             && result.from->getDSTSavings() == result.to->getDSTSavings()) {
             // No offset changes.  Try next one if not final
             return findPrev(result.time, FALSE /* always exclusive */,
                 transitionTime, fromRule, toRule);
         }
         transitionTime = result.time;
         fromRule = result.from;
         toRule = result.to;
         return TRUE;
     }
     return FALSE;
 }
 UDate
 RuleBasedTimeZone::getTransitionTime(Transition* transition, UBool local,
                                      int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const {
     UDate time = transition->time;
     if (local) {
         time += getLocalDelta(transition->from->getRawOffset(), transition->from->getDSTSavings(),
                               transition->to->getRawOffset(), transition->to->getDSTSavings(),
                               NonExistingTimeOpt, DuplicatedTimeOpt);
     }
     return time;
 }
 int32_t
 RuleBasedTimeZone::getLocalDelta(int32_t rawBefore, int32_t dstBefore, int32_t rawAfter, int32_t dstAfter,
                              int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const {
     int32_t delta = 0;
     int32_t offsetBefore = rawBefore + dstBefore;
     int32_t offsetAfter = rawAfter + dstAfter;
     UBool dstToStd = (dstBefore != 0) && (dstAfter == 0);
     UBool stdToDst = (dstBefore == 0) && (dstAfter != 0);
     if (offsetAfter - offsetBefore >= 0) {
         // Positive transition, which makes a non-existing local time range
         if (((NonExistingTimeOpt & kStdDstMask) == kStandard && dstToStd)
                 || ((NonExistingTimeOpt & kStdDstMask) == kDaylight && stdToDst)) {
             delta = offsetBefore;
         } else if (((NonExistingTimeOpt & kStdDstMask) == kStandard && stdToDst)
                 || ((NonExistingTimeOpt & kStdDstMask) == kDaylight && dstToStd)) {
             delta = offsetAfter;
         } else if ((NonExistingTimeOpt & kFormerLatterMask) == kLatter) {
             delta = offsetBefore;
         } else {
             // Interprets the time with rule before the transition,
             // default for non-existing time range
             delta = offsetAfter;
         }
     } else {
         // Negative transition, which makes a duplicated local time range
         if (((DuplicatedTimeOpt & kStdDstMask) == kStandard && dstToStd)
                 || ((DuplicatedTimeOpt & kStdDstMask) == kDaylight && stdToDst)) {
             delta = offsetAfter;
         } else if (((DuplicatedTimeOpt & kStdDstMask) == kStandard && stdToDst)
                 || ((DuplicatedTimeOpt & kStdDstMask) == kDaylight && dstToStd)) {
             delta = offsetBefore;
         } else if ((DuplicatedTimeOpt & kFormerLatterMask) == kFormer) {
             delta = offsetBefore;
         } else {
             // Interprets the time with rule after the transition,
             // default for duplicated local time range
             delta = offsetAfter;
         }
     }
     return delta;
 }
 U_NAMESPACE_END
 #endif /* #if !UCONFIG_NO_FORMATTING */
 //eof

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intl/icu/source/i18n/rbtz.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/rbtz.cpp