| /* |
| ********************************************************************** |
| * Copyright (c) 2003-2004, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ********************************************************************** |
| * Author: Alan Liu |
| * Created: July 21 2003 |
| * Since: ICU 2.8 |
| ********************************************************************** |
| */ |
| |
| #include "olsontz.h" |
| |
| #if !UCONFIG_NO_FORMATTING |
| |
| #include "unicode/ures.h" |
| #include "unicode/simpletz.h" |
| #include "unicode/gregocal.h" |
| #include "gregoimp.h" |
| #include "cmemory.h" |
| #include "uassert.h" |
| #include <float.h> // DBL_MAX |
| |
| #ifdef U_DEBUG_TZ |
| # include <stdio.h> |
| # include "uresimp.h" // for debugging |
| |
| static void debug_tz_loc(const char *f, int32_t l) |
| { |
| fprintf(stderr, "%s:%d: ", f, l); |
| } |
| |
| static void debug_tz_msg(const char *pat, ...) |
| { |
| va_list ap; |
| va_start(ap, pat); |
| vfprintf(stderr, pat, ap); |
| fflush(stderr); |
| } |
| // must use double parens, i.e.: U_DEBUG_TZ_MSG(("four is: %d",4)); |
| #define U_DEBUG_TZ_MSG(x) {debug_tz_loc(__FILE__,__LINE__);debug_tz_msg x;} |
| #else |
| #define U_DEBUG_TZ_MSG(x) |
| #endif |
| |
| U_NAMESPACE_BEGIN |
| |
| #define SECONDS_PER_DAY (24*60*60) |
| |
| static const int32_t ZEROS[] = {0,0}; |
| |
| UOBJECT_DEFINE_RTTI_IMPLEMENTATION(OlsonTimeZone) |
| |
| /** |
| * Default constructor. Creates a time zone with an empty ID and |
| * a fixed GMT offset of zero. |
| */ |
| OlsonTimeZone::OlsonTimeZone() : finalYear(INT32_MAX), finalMillis(DBL_MAX), finalZone(0) { |
| constructEmpty(); |
| } |
| |
| /** |
| * Construct a GMT+0 zone with no transitions. This is done when a |
| * constructor fails so the resultant object is well-behaved. |
| */ |
| void OlsonTimeZone::constructEmpty() { |
| transitionCount = 0; |
| typeCount = 1; |
| transitionTimes = typeOffsets = ZEROS; |
| typeData = (const uint8_t*) ZEROS; |
| } |
| |
| /** |
| * Construct from a resource bundle |
| * @param top the top-level zoneinfo resource bundle. This is used |
| * to lookup the rule that `res' may refer to, if there is one. |
| * @param res the resource bundle of the zone to be constructed |
| * @param ec input-output error code |
| */ |
| OlsonTimeZone::OlsonTimeZone(const UResourceBundle* top, |
| const UResourceBundle* res, |
| UErrorCode& ec) : |
| finalYear(INT32_MAX), finalMillis(DBL_MAX), finalZone(0) |
| { |
| U_DEBUG_TZ_MSG(("OlsonTimeZone(%s)\n", ures_getKey((UResourceBundle*)res))); |
| if ((top == NULL || res == NULL) && U_SUCCESS(ec)) { |
| ec = U_ILLEGAL_ARGUMENT_ERROR; |
| } |
| if (U_SUCCESS(ec)) { |
| // TODO -- clean up -- Doesn't work if res points to an alias |
| // // TODO remove nonconst casts below when ures_* API is fixed |
| // setID(ures_getKey((UResourceBundle*) res)); // cast away const |
| |
| // Size 1 is an alias TO another zone (int) |
| // HOWEVER, the caller should dereference this and never pass it in to us |
| // Size 3 is a purely historical zone (no final rules) |
| // Size 4 is like size 3, but with an alias list at the end |
| // Size 5 is a hybrid zone, with historical and final elements |
| // Size 6 is like size 5, but with an alias list at the end |
| int32_t size = ures_getSize((UResourceBundle*) res); // cast away const |
| if (size < 3 || size > 6) { |
| ec = U_INVALID_FORMAT_ERROR; |
| } |
| |
| // Transitions list may be empty |
| int32_t i; |
| UResourceBundle* r = ures_getByIndex(res, 0, NULL, &ec); |
| transitionTimes = ures_getIntVector(r, &i, &ec); |
| ures_close(r); |
| if ((i<0 || i>0x7FFF) && U_SUCCESS(ec)) { |
| ec = U_INVALID_FORMAT_ERROR; |
| } |
| transitionCount = (int16_t) i; |
| |
| // Type offsets list must be of even size, with size >= 2 |
| r = ures_getByIndex(res, 1, NULL, &ec); |
| typeOffsets = ures_getIntVector(r, &i, &ec); |
| ures_close(r); |
| if ((i<2 || i>0x7FFE || ((i&1)!=0)) && U_SUCCESS(ec)) { |
| ec = U_INVALID_FORMAT_ERROR; |
| } |
| typeCount = (int16_t) i >> 1; |
| |
| // Type data must be of the same size as the transitions list |
| r = ures_getByIndex(res, 2, NULL, &ec); |
| int32_t len; |
| typeData = ures_getBinary(r, &len, &ec); |
| ures_close(r); |
| if (len != transitionCount && U_SUCCESS(ec)) { |
| ec = U_INVALID_FORMAT_ERROR; |
| } |
| |
| #if defined (U_DEBUG_TZ) |
| U_DEBUG_TZ_MSG(("OlsonTimeZone(%s) - size = %d, typecount %d transitioncount %d - err %s\n", ures_getKey((UResourceBundle*)res), size, typeCount, transitionCount, u_errorName(ec))); |
| if(U_SUCCESS(ec)) { |
| int32_t jj; |
| for(jj=0;jj<transitionCount;jj++) { |
| U_DEBUG_TZ_MSG((" Transition %d: time %d, typedata%d\n", jj, transitionTimes[jj], typeData[jj])); |
| } |
| for(jj=0;jj<transitionCount;jj++) { |
| U_DEBUG_TZ_MSG((" Type %d: offset%d\n", jj, typeOffsets[jj])); |
| } |
| } |
| #endif |
| |
| // Process final rule and data, if any |
| if (size >= 5) { |
| int32_t ruleidLen = 0; |
| const UChar* idUStr = ures_getStringByIndex(res, 3, &ruleidLen, &ec); |
| UnicodeString ruleid(TRUE, idUStr, ruleidLen); |
| r = ures_getByIndex(res, 4, NULL, &ec); |
| const int32_t* data = ures_getIntVector(r, &len, &ec); |
| #if defined U_DEBUG_TZ |
| const char *rKey = ures_getKey(r); |
| const char *zKey = ures_getKey((UResourceBundle*)res); |
| #endif |
| ures_close(r); |
| if (U_SUCCESS(ec)) { |
| if (data != 0 && len == 2) { |
| int32_t rawOffset = data[0] * U_MILLIS_PER_SECOND; |
| // Subtract one from the actual final year; we |
| // actually store final year - 1, and compare |
| // using > rather than >=. This allows us to use |
| // INT32_MAX as an exclusive upper limit for all |
| // years, including INT32_MAX. |
| U_ASSERT(data[1] > INT32_MIN); |
| finalYear = data[1] - 1; |
| // Also compute the millis for Jan 1, 0:00 GMT of the |
| // finalYear. This reduces runtime computations. |
| finalMillis = Grego::fieldsToDay(data[1], 0, 1) * U_MILLIS_PER_DAY; |
| U_DEBUG_TZ_MSG(("zone%s|%s: {%d,%d}, finalYear%d, finalMillis%.1lf\n", |
| zKey,rKey, data[0], data[1], finalYear, finalMillis)); |
| r = TimeZone::loadRule(top, ruleid, NULL, ec); |
| if (U_SUCCESS(ec)) { |
| // 3, 1, -1, 7200, 0, 9, -31, -1, 7200, 0, 3600 |
| data = ures_getIntVector(r, &len, &ec); |
| if (U_SUCCESS(ec) && len == 11) { |
| UnicodeString emptyStr; |
| U_DEBUG_TZ_MSG(("zone%s, rule%s: {%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d}", zKey, ures_getKey(r), |
| data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7], data[8], data[9], data[10])); |
| finalZone = new SimpleTimeZone(rawOffset, emptyStr, |
| (int8_t)data[0], (int8_t)data[1], (int8_t)data[2], |
| data[3] * U_MILLIS_PER_SECOND, |
| (SimpleTimeZone::TimeMode) data[4], |
| (int8_t)data[5], (int8_t)data[6], (int8_t)data[7], |
| data[8] * U_MILLIS_PER_SECOND, |
| (SimpleTimeZone::TimeMode) data[9], |
| data[10] * U_MILLIS_PER_SECOND, ec); |
| } else { |
| ec = U_INVALID_FORMAT_ERROR; |
| } |
| } |
| ures_close(r); |
| } else { |
| ec = U_INVALID_FORMAT_ERROR; |
| } |
| } |
| } |
| } |
| |
| if (U_FAILURE(ec)) { |
| constructEmpty(); |
| } |
| } |
| |
| /** |
| * Copy constructor |
| */ |
| OlsonTimeZone::OlsonTimeZone(const OlsonTimeZone& other) : |
| TimeZone(other), finalZone(0) { |
| *this = other; |
| } |
| |
| /** |
| * Assignment operator |
| */ |
| OlsonTimeZone& OlsonTimeZone::operator=(const OlsonTimeZone& other) { |
| transitionCount = other.transitionCount; |
| typeCount = other.typeCount; |
| transitionTimes = other.transitionTimes; |
| typeOffsets = other.typeOffsets; |
| typeData = other.typeData; |
| finalYear = other.finalYear; |
| finalMillis = other.finalMillis; |
| delete finalZone; |
| finalZone = (other.finalZone != 0) ? |
| (SimpleTimeZone*) other.finalZone->clone() : 0; |
| return *this; |
| } |
| |
| /** |
| * Destructor |
| */ |
| OlsonTimeZone::~OlsonTimeZone() { |
| delete finalZone; |
| } |
| |
| /** |
| * Returns true if the two TimeZone objects are equal. |
| */ |
| UBool OlsonTimeZone::operator==(const TimeZone& other) const { |
| const OlsonTimeZone* z = (const OlsonTimeZone*) &other; |
| |
| return TimeZone::operator==(other) && |
| // [sic] pointer comparison: typeData points into |
| // memory-mapped or DLL space, so if two zones have the same |
| // pointer, they are equal. |
| (typeData == z->typeData || |
| // If the pointers are not equal, the zones may still |
| // be equal if their rules and transitions are equal |
| (finalYear == z->finalYear && |
| // Don't compare finalMillis; if finalYear is ==, so is finalMillis |
| ((finalZone == 0 && z->finalZone == 0) || |
| (finalZone != 0 && z->finalZone != 0 && |
| *finalZone == *z->finalZone)) && |
| transitionCount == z->transitionCount && |
| typeCount == z->typeCount && |
| uprv_memcmp(transitionTimes, z->transitionTimes, |
| sizeof(transitionTimes[0]) * transitionCount) == 0 && |
| uprv_memcmp(typeOffsets, z->typeOffsets, |
| (sizeof(typeOffsets[0]) * typeCount) << 1) == 0 && |
| uprv_memcmp(typeData, z->typeData, |
| (sizeof(typeData[0]) * typeCount)) == 0 |
| )); |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| TimeZone* OlsonTimeZone::clone() const { |
| return new OlsonTimeZone(*this); |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| int32_t OlsonTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, |
| int32_t dom, uint8_t dow, |
| int32_t millis, UErrorCode& ec) const { |
| if (month < UCAL_JANUARY || month > UCAL_DECEMBER) { |
| if (U_SUCCESS(ec)) { |
| ec = U_ILLEGAL_ARGUMENT_ERROR; |
| } |
| return 0; |
| } else { |
| return getOffset(era, year, month, dom, dow, millis, |
| Grego::monthLength(year, month), |
| ec); |
| } |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| int32_t OlsonTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, |
| int32_t dom, uint8_t dow, |
| int32_t millis, int32_t monthLength, |
| UErrorCode& ec) const { |
| if (U_FAILURE(ec)) { |
| return 0; |
| } |
| |
| if ((era != GregorianCalendar::AD && era != GregorianCalendar::BC) |
| || month < UCAL_JANUARY |
| || month > UCAL_DECEMBER |
| || dom < 1 |
| || dom > monthLength |
| || dow < UCAL_SUNDAY |
| || dow > UCAL_SATURDAY |
| || millis < 0 |
| || millis >= U_MILLIS_PER_DAY |
| || monthLength < 28 |
| || monthLength > 31) { |
| ec = U_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| if (era == GregorianCalendar::BC) { |
| year = -year; |
| } |
| |
| if (year > finalYear) { // [sic] >, not >=; see above |
| U_ASSERT(finalZone != 0); |
| return finalZone->getOffset(era, year, month, dom, dow, |
| millis, monthLength, ec); |
| } |
| |
| // Compute local epoch seconds from input fields |
| double time = Grego::fieldsToDay(year, month, dom) * SECONDS_PER_DAY + |
| uprv_floor(millis / (double) U_MILLIS_PER_SECOND); |
| |
| return zoneOffset(findTransition(time, TRUE)) * U_MILLIS_PER_SECOND; |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| void OlsonTimeZone::getOffset(UDate date, UBool local, int32_t& rawoff, |
| int32_t& dstoff, UErrorCode& ec) const { |
| if (U_FAILURE(ec)) { |
| return; |
| } |
| |
| // The check against finalMillis will suffice most of the time, except |
| // for the case in which finalMillis == DBL_MAX, date == DBL_MAX, |
| // and finalZone == 0. For this case we add "&& finalZone != 0". |
| if (date >= finalMillis && finalZone != 0) { |
| int32_t year, month, dom, dow; |
| double millis; |
| double days = Math::floorDivide(date, (double)U_MILLIS_PER_DAY, millis); |
| |
| Grego::dayToFields(days, year, month, dom, dow); |
| |
| rawoff = finalZone->getRawOffset(); |
| |
| if (!local) { |
| // Adjust from GMT to local |
| date += rawoff; |
| double days2 = Math::floorDivide(date, (double)U_MILLIS_PER_DAY, millis); |
| if (days2 != days) { |
| Grego::dayToFields(days2, year, month, dom, dow); |
| } |
| } |
| |
| dstoff = finalZone->getOffset( |
| GregorianCalendar::AD, year, month, |
| dom, (uint8_t) dow, (int32_t) millis, ec) - rawoff; |
| return; |
| } |
| |
| double secs = uprv_floor(date / U_MILLIS_PER_SECOND); |
| int16_t i = findTransition(secs, local); |
| rawoff = rawOffset(i) * U_MILLIS_PER_SECOND; |
| dstoff = dstOffset(i) * U_MILLIS_PER_SECOND; |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| void OlsonTimeZone::setRawOffset(int32_t /*offsetMillis*/) { |
| // We don't support this operation, since OlsonTimeZones are |
| // immutable (except for the ID, which is in the base class). |
| |
| // Nothing to do! |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| int32_t OlsonTimeZone::getRawOffset() const { |
| UErrorCode ec = U_ZERO_ERROR; |
| int32_t raw, dst; |
| getOffset((double) uprv_getUTCtime() * U_MILLIS_PER_SECOND, |
| FALSE, raw, dst, ec); |
| return raw; |
| } |
| |
| /** |
| * Find the smallest i (in 0..transitionCount-1) such that time >= |
| * transition(i), where transition(i) is either the GMT or the local |
| * transition time, as specified by `local'. |
| * @param time epoch seconds, either GMT or local wall |
| * @param local if TRUE, `time' is in local wall units, otherwise it |
| * is GMT |
| * @return an index i, where 0 <= i < transitionCount, and |
| * transition(i) <= time < transition(i+1), or i == 0 if |
| * transitionCount == 0 or time < transition(0). |
| */ |
| int16_t OlsonTimeZone::findTransition(double time, UBool local) const { |
| int16_t i = 0; |
| |
| if (transitionCount != 0) { |
| // Linear search from the end is the fastest approach, since |
| // most lookups will happen at/near the end. |
| for (i = transitionCount - 1; i > 0; --i) { |
| int32_t transition = transitionTimes[i]; |
| if (local) { |
| transition += zoneOffset(typeData[i]); |
| } |
| if (time >= transition) { |
| break; |
| } |
| } |
| |
| U_ASSERT(i>=0 && i<transitionCount); |
| |
| // Check invariants for GMT times; if these pass for GMT times |
| // the local logic should be working too. |
| U_ASSERT(local || time < transitionTimes[0] || time >= transitionTimes[i]); |
| U_ASSERT(local || i == transitionCount-1 || time < transitionTimes[i+1]); |
| |
| i = typeData[i]; |
| } |
| |
| U_ASSERT(i>=0 && i<typeCount); |
| |
| return i; |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| UBool OlsonTimeZone::useDaylightTime() const { |
| // If DST was observed in 1942 (for example) but has never been |
| // observed from 1943 to the present, most clients will expect |
| // this method to return FALSE. This method determines whether |
| // DST is in use in the current year (at any point in the year) |
| // and returns TRUE if so. |
| |
| int32_t days = (int32_t)Math::floorDivide(uprv_getUTCtime(), (double)U_MILLIS_PER_DAY); // epoch days |
| |
| int32_t year, month, dom, dow; |
| |
| Grego::dayToFields(days, year, month, dom, dow); |
| |
| if (year > finalYear) { // [sic] >, not >=; see above |
| U_ASSERT(finalZone != 0 && finalZone->useDaylightTime()); |
| return TRUE; |
| } |
| |
| // Find start of this year, and start of next year |
| int32_t start = (int32_t) Grego::fieldsToDay(year, 0, 1) * SECONDS_PER_DAY; |
| int32_t limit = (int32_t) Grego::fieldsToDay(year+1, 0, 1) * SECONDS_PER_DAY; |
| |
| // Return TRUE if DST is observed at any time during the current |
| // year. |
| for (int16_t i=0; i<transitionCount; ++i) { |
| if (transitionTimes[i] >= limit) { |
| break; |
| } |
| if (transitionTimes[i] >= start && |
| dstOffset(typeData[i]) != 0) { |
| return TRUE; |
| } |
| } |
| return FALSE; |
| } |
| |
| /** |
| * TimeZone API. |
| */ |
| UBool OlsonTimeZone::inDaylightTime(UDate date, UErrorCode& ec) const { |
| int32_t raw, dst; |
| getOffset(date, FALSE, raw, dst, ec); |
| return dst != 0; |
| } |
| |
| U_NAMESPACE_END |
| |
| #endif // !UCONFIG_NO_FORMATTING |
| |
| //eof |
