Check in the pristine copy of ICU 4.6...

icu46/source/i18n/wintzimpl.cpp

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