michael@0: /*
michael@0: ********************************************************************************
michael@0: *   Copyright (C) 2009-2011, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: ********************************************************************************
michael@0: *
michael@0: * File WINTZIMPL.CPP
michael@0: *
michael@0: ********************************************************************************
michael@0: */
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: 
michael@0: #if U_PLATFORM_HAS_WIN32_API
michael@0: 
michael@0: #include "wintzimpl.h"
michael@0: 
michael@0: #include "unicode/unistr.h"
michael@0: #include "unicode/timezone.h"
michael@0: #include "unicode/basictz.h"
michael@0: #include "putilimp.h"
michael@0: #include "uassert.h"
michael@0: #include "cmemory.h"
michael@0: 
michael@0: #   define WIN32_LEAN_AND_MEAN
michael@0: #   define VC_EXTRALEAN
michael@0: #   define NOUSER
michael@0: #   define NOSERVICE
michael@0: #   define NOIME
michael@0: #   define NOMCX
michael@0: 
michael@0: #include <windows.h>
michael@0: 
michael@0: U_NAMESPACE_USE
michael@0: 
michael@0: static UBool getSystemTimeInformation(TimeZone *tz, SYSTEMTIME &daylightDate, SYSTEMTIME &standardDate, int32_t &bias, int32_t &daylightBias, int32_t &standardBias) {
michael@0:     UErrorCode status = U_ZERO_ERROR;
michael@0:     UBool result = TRUE;
michael@0:     BasicTimeZone *btz = (BasicTimeZone*)tz; // we should check type
michael@0:     InitialTimeZoneRule *initial = NULL;
michael@0:     AnnualTimeZoneRule *std = NULL, *dst = NULL;
michael@0: 
michael@0:     btz->getSimpleRulesNear(uprv_getUTCtime(), initial, std, dst, status);
michael@0:     if (U_SUCCESS(status)) {
michael@0:         if (std == NULL || dst == NULL) {
michael@0:             bias = -1 * (initial->getRawOffset()/60000);
michael@0:             standardBias = 0;
michael@0:             daylightBias = 0;
michael@0:             // Do not use DST.  Set 0 to all stadardDate/daylightDate fields
michael@0:             standardDate.wYear = standardDate.wMonth  = standardDate.wDayOfWeek = standardDate.wDay = 
michael@0:             standardDate.wHour = standardDate.wMinute = standardDate.wSecond    = standardDate.wMilliseconds = 0;
michael@0:             daylightDate.wYear = daylightDate.wMonth  = daylightDate.wDayOfWeek = daylightDate.wDay =
michael@0:             daylightDate.wHour = daylightDate.wMinute = daylightDate.wSecond    = daylightDate.wMilliseconds = 0;
michael@0:         } else {
michael@0:             U_ASSERT(std->getRule()->getDateRuleType() == DateTimeRule::DOW);
michael@0:             U_ASSERT(dst->getRule()->getDateRuleType() == DateTimeRule::DOW);
michael@0: 
michael@0:             bias = -1 * (std->getRawOffset()/60000);
michael@0:             standardBias = 0;
michael@0:             daylightBias = -1 * (dst->getDSTSavings()/60000);
michael@0:             // Always use DOW type rule
michael@0:             int32_t hour, min, sec, mil;
michael@0:             standardDate.wYear = 0;
michael@0:             standardDate.wMonth = std->getRule()->getRuleMonth() + 1;
michael@0:             standardDate.wDay = std->getRule()->getRuleWeekInMonth();
michael@0:             if (standardDate.wDay < 0) {
michael@0:                 standardDate.wDay = 5;
michael@0:             }
michael@0:             standardDate.wDayOfWeek = std->getRule()->getRuleDayOfWeek() - 1;
michael@0: 
michael@0:             mil = std->getRule()->getRuleMillisInDay();
michael@0:             hour = mil/3600000;
michael@0:             mil %= 3600000;
michael@0:             min = mil/60000;
michael@0:             mil %= 60000;
michael@0:             sec = mil/1000;
michael@0:             mil %= 1000;
michael@0: 
michael@0:             standardDate.wHour = hour;
michael@0:             standardDate.wMinute = min;
michael@0:             standardDate.wSecond = sec;
michael@0:             standardDate.wMilliseconds = mil;
michael@0: 
michael@0:             daylightDate.wYear = 0;
michael@0:             daylightDate.wMonth = dst->getRule()->getRuleMonth() + 1;
michael@0:             daylightDate.wDay = dst->getRule()->getRuleWeekInMonth();
michael@0:             if (daylightDate.wDay < 0) {
michael@0:                 daylightDate.wDay = 5;
michael@0:             }
michael@0:             daylightDate.wDayOfWeek = dst->getRule()->getRuleDayOfWeek() - 1;
michael@0: 
michael@0:             mil = dst->getRule()->getRuleMillisInDay();
michael@0:             hour = mil/3600000;
michael@0:             mil %= 3600000;
michael@0:             min = mil/60000;
michael@0:             mil %= 60000;
michael@0:             sec = mil/1000;
michael@0:             mil %= 1000;
michael@0: 
michael@0:             daylightDate.wHour = hour;
michael@0:             daylightDate.wMinute = min;
michael@0:             daylightDate.wSecond = sec;
michael@0:             daylightDate.wMilliseconds = mil;
michael@0:         }
michael@0:     } else {
michael@0:         result = FALSE;
michael@0:     }
michael@0: 
michael@0:     delete initial;
michael@0:     delete std;
michael@0:     delete dst;
michael@0: 
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: static UBool getWindowsTimeZoneInfo(TIME_ZONE_INFORMATION *zoneInfo, const UChar *icuid, int32_t length) {
michael@0:     UBool result = FALSE;
michael@0:     UnicodeString id = UnicodeString(icuid, length);
michael@0:     TimeZone *tz = TimeZone::createTimeZone(id);
michael@0:     
michael@0:     if (tz != NULL) {
michael@0:         int32_t bias;
michael@0:         int32_t daylightBias;
michael@0:         int32_t standardBias;
michael@0:         SYSTEMTIME daylightDate;
michael@0:         SYSTEMTIME standardDate;
michael@0: 
michael@0:         if (getSystemTimeInformation(tz, daylightDate, standardDate, bias, daylightBias, standardBias)) {
michael@0:             uprv_memset(zoneInfo, 0, sizeof(TIME_ZONE_INFORMATION)); // We do not set standard/daylight names, so nullify first.
michael@0:             zoneInfo->Bias          = bias;
michael@0:             zoneInfo->DaylightBias  = daylightBias;
michael@0:             zoneInfo->StandardBias  = standardBias;
michael@0:             zoneInfo->DaylightDate  = daylightDate;
michael@0:             zoneInfo->StandardDate  = standardDate;
michael@0: 
michael@0:             result = TRUE;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return result;
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Given the timezone icuid, fill in zoneInfo by calling auxillary functions that creates a timezone and extract the 
michael@0:  * information to put into zoneInfo. This includes bias and standard time date and daylight saving date.
michael@0:  */
michael@0: U_CAPI UBool U_EXPORT2
michael@0: uprv_getWindowsTimeZoneInfo(TIME_ZONE_INFORMATION *zoneInfo, const UChar *icuid, int32_t length)
michael@0: {
michael@0:     if (getWindowsTimeZoneInfo(zoneInfo, icuid, length)) {
michael@0:         return TRUE;
michael@0:     } else {
michael@0:         return FALSE;
michael@0:     }
michael@0: }
michael@0: 
michael@0: #endif