Add m-esr52 at 52.6.0

1 files changed, 1713 insertions, 0 deletions

diff --git a/intl/icu/source/i18n/timezone.cpp b/intl/icu/source/i18n/timezone.cpp
new file mode 100644
index 000000000..502b777d2
--- /dev/null
+++ b/intl/icu/source/i18n/timezone.cpp
@@ -0,0 +1,1713 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 1997-2016, International Business Machines Corporation and
+* others. All Rights Reserved.
+*******************************************************************************
+*
+* File TIMEZONE.CPP
+*
+* Modification History:
+*
+*   Date        Name        Description
+*   12/05/96    clhuang     Creation.
+*   04/21/97    aliu        General clean-up and bug fixing.
+*   05/08/97    aliu        Fixed Hashtable code per code review.
+*   07/09/97    helena      Changed createInstance to createDefault.
+*   07/29/97    aliu        Updated with all-new list of 96 UNIX-derived
+*                           TimeZones.  Changed mechanism to load from static
+*                           array rather than resource bundle.
+*   07/07/1998  srl         Bugfixes from the Java side: UTC GMT CAT NST
+*                           Added getDisplayName API
+*                           going to add custom parsing.
+*
+*                           ISSUES:
+*                               - should getDisplayName cache something?
+*                               - should custom time zones be cached? [probably]
+*  08/10/98     stephen     Brought getDisplayName() API in-line w/ conventions
+*  08/19/98     stephen     Changed createTimeZone() to never return 0
+*  09/02/98     stephen     Added getOffset(monthLen) and hasSameRules()
+*  09/15/98     stephen     Added getStaticClassID()
+*  02/22/99     stephen     Removed character literals for EBCDIC safety
+*  05/04/99     stephen     Changed initDefault() for Mutex issues
+*  07/12/99     helena      HPUX 11 CC Port.
+*  12/03/99     aliu        Moved data out of static table into icudata.dll.
+*                           Substantial rewrite of zone lookup, default zone, and
+*                           available IDs code.  Misc. cleanup.
+*********************************************************************************/
+
+#include "utypeinfo.h"  // for 'typeid' to work
+
+#include "unicode/utypes.h"
+#include "unicode/ustring.h"
+#include "uassert.h"
+#include "ustr_imp.h"
+
+#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);
+}
+static char gStrBuf[256];
+#define U_DEBUG_TZ_STR(x) u_austrncpy(gStrBuf,x,sizeof(gStrBuf)-1)
+// 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
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/simpletz.h"
+#include "unicode/calendar.h"
+#include "unicode/gregocal.h"
+#include "unicode/ures.h"
+#include "unicode/tzfmt.h"
+#include "unicode/numfmt.h"
+#include "gregoimp.h"
+#include "uresimp.h" // struct UResourceBundle
+#include "olsontz.h"
+#include "mutex.h"
+#include "unicode/udata.h"
+#include "ucln_in.h"
+#include "cstring.h"
+#include "cmemory.h"
+#include "unicode/strenum.h"
+#include "uassert.h"
+#include "zonemeta.h"
+
+#define kZONEINFO "zoneinfo64"
+#define kREGIONS  "Regions"
+#define kZONES    "Zones"
+#define kRULES    "Rules"
+#define kNAMES    "Names"
+#define kTZVERSION  "TZVersion"
+#define kLINKS    "links"
+#define kMAX_CUSTOM_HOUR    23
+#define kMAX_CUSTOM_MIN     59
+#define kMAX_CUSTOM_SEC     59
+#define MINUS 0x002D
+#define PLUS 0x002B
+#define ZERO_DIGIT 0x0030
+#define COLON 0x003A
+
+// Static data and constants
+
+static const UChar         WORLD[] = {0x30, 0x30, 0x31, 0x00}; /* "001" */
+
+static const UChar         GMT_ID[] = {0x47, 0x4D, 0x54, 0x00}; /* "GMT" */
+static const UChar         UNKNOWN_ZONE_ID[] = {0x45, 0x74, 0x63, 0x2F, 0x55, 0x6E, 0x6B, 0x6E, 0x6F, 0x77, 0x6E, 0x00}; /* "Etc/Unknown" */
+static const int32_t       GMT_ID_LENGTH = 3;
+static const int32_t       UNKNOWN_ZONE_ID_LENGTH = 11;
+
+static icu::TimeZone* DEFAULT_ZONE = NULL;
+static icu::UInitOnce gDefaultZoneInitOnce = U_INITONCE_INITIALIZER;
+
+// Prevents DEFAULT_ZONE from being deleted while another thread is cloning it.
+static UMutex gDefaultZoneMutex = U_MUTEX_INITIALIZER;
+
+static icu::TimeZone* _GMT = NULL;
+static icu::TimeZone* _UNKNOWN_ZONE = NULL;
+static icu::UInitOnce gStaticZonesInitOnce = U_INITONCE_INITIALIZER;
+
+static char TZDATA_VERSION[16];
+static icu::UInitOnce gTZDataVersionInitOnce = U_INITONCE_INITIALIZER;
+
+static int32_t* MAP_SYSTEM_ZONES = NULL;
+static int32_t* MAP_CANONICAL_SYSTEM_ZONES = NULL;
+static int32_t* MAP_CANONICAL_SYSTEM_LOCATION_ZONES = NULL;
+
+static int32_t LEN_SYSTEM_ZONES = 0;
+static int32_t LEN_CANONICAL_SYSTEM_ZONES = 0;
+static int32_t LEN_CANONICAL_SYSTEM_LOCATION_ZONES = 0;
+
+static icu::UInitOnce gSystemZonesInitOnce = U_INITONCE_INITIALIZER;
+static icu::UInitOnce gCanonicalZonesInitOnce = U_INITONCE_INITIALIZER;
+static icu::UInitOnce gCanonicalLocationZonesInitOnce = U_INITONCE_INITIALIZER;
+
+U_CDECL_BEGIN
+static UBool U_CALLCONV timeZone_cleanup(void)
+{
+    U_NAMESPACE_USE
+    delete DEFAULT_ZONE;
+    DEFAULT_ZONE = NULL;
+    gDefaultZoneInitOnce.reset();
+
+    delete _GMT;
+    _GMT = NULL;
+    delete _UNKNOWN_ZONE;
+    _UNKNOWN_ZONE = NULL;
+    gStaticZonesInitOnce.reset();
+
+    uprv_memset(TZDATA_VERSION, 0, sizeof(TZDATA_VERSION));
+    gTZDataVersionInitOnce.reset();
+
+    LEN_SYSTEM_ZONES = 0;
+    uprv_free(MAP_SYSTEM_ZONES);
+    MAP_SYSTEM_ZONES = 0;
+    gSystemZonesInitOnce.reset();
+
+    LEN_CANONICAL_SYSTEM_ZONES = 0;
+    uprv_free(MAP_CANONICAL_SYSTEM_ZONES);
+    MAP_CANONICAL_SYSTEM_ZONES = 0;
+    gCanonicalZonesInitOnce.reset();
+
+    LEN_CANONICAL_SYSTEM_LOCATION_ZONES = 0;
+    uprv_free(MAP_CANONICAL_SYSTEM_LOCATION_ZONES);
+    MAP_CANONICAL_SYSTEM_LOCATION_ZONES = 0;
+    gCanonicalLocationZonesInitOnce.reset();
+
+    return TRUE;
+}
+U_CDECL_END
+
+U_NAMESPACE_BEGIN
+
+static int32_t findInStringArray(UResourceBundle* array, const UnicodeString& id, UErrorCode &status)
+{
+    UnicodeString copy;
+    const UChar *u;
+    int32_t len;
+
+    int32_t start = 0;
+    int32_t limit = ures_getSize(array);
+    int32_t mid;
+    int32_t lastMid = INT32_MAX;
+    if(U_FAILURE(status) || (limit < 1)) {
+        return -1;
+    }
+    U_DEBUG_TZ_MSG(("fisa: Looking for %s, between %d and %d\n", U_DEBUG_TZ_STR(UnicodeString(id).getTerminatedBuffer()), start, limit));
+
+    for (;;) {
+        mid = (int32_t)((start + limit) / 2);
+        if (lastMid == mid) {   /* Have we moved? */
+            break;  /* We haven't moved, and it wasn't found. */
+        }
+        lastMid = mid;
+        u = ures_getStringByIndex(array, mid, &len, &status);
+        if (U_FAILURE(status)) {
+            break;
+        }
+        U_DEBUG_TZ_MSG(("tz: compare to %s, %d .. [%d] .. %d\n", U_DEBUG_TZ_STR(u), start, mid, limit));
+        copy.setTo(TRUE, u, len);
+        int r = id.compare(copy);
+        if(r==0) {
+            U_DEBUG_TZ_MSG(("fisa: found at %d\n", mid));
+            return mid;
+        } else if(r<0) {
+            limit = mid;
+        } else {
+            start = mid;
+        }
+    }
+    U_DEBUG_TZ_MSG(("fisa: not found\n"));
+    return -1;
+}
+
+/**
+ * Fetch a specific zone by name.  Replaces the getByKey call.
+ * @param top Top timezone resource
+ * @param id Time zone ID
+ * @param oldbundle Bundle for reuse (or NULL).   see 'ures_open()'
+ * @return the zone's bundle if found, or undefined if error.  Reuses oldbundle.
+ */
+static UResourceBundle* getZoneByName(const UResourceBundle* top, const UnicodeString& id, UResourceBundle *oldbundle, UErrorCode& status) {
+    // load the Rules object
+    UResourceBundle *tmp = ures_getByKey(top, kNAMES, NULL, &status);
+
+    // search for the string
+    int32_t idx = findInStringArray(tmp, id, status);
+
+    if((idx == -1) && U_SUCCESS(status)) {
+        // not found
+        status = U_MISSING_RESOURCE_ERROR;
+        //ures_close(oldbundle);
+        //oldbundle = NULL;
+    } else {
+        U_DEBUG_TZ_MSG(("gzbn: oldbundle= size %d, type %d, %s\n", ures_getSize(tmp), ures_getType(tmp), u_errorName(status)));
+        tmp = ures_getByKey(top, kZONES, tmp, &status); // get Zones object from top
+        U_DEBUG_TZ_MSG(("gzbn: loaded ZONES, size %d, type %d, path %s %s\n", ures_getSize(tmp), ures_getType(tmp), ures_getPath(tmp), u_errorName(status)));
+        oldbundle = ures_getByIndex(tmp, idx, oldbundle, &status); // get nth Zone object
+        U_DEBUG_TZ_MSG(("gzbn: loaded z#%d, size %d, type %d, path %s, %s\n", idx, ures_getSize(oldbundle), ures_getType(oldbundle), ures_getPath(oldbundle),  u_errorName(status)));
+    }
+    ures_close(tmp);
+    if(U_FAILURE(status)) {
+        //ures_close(oldbundle);
+        return NULL;
+    } else {
+        return oldbundle;
+    }
+}
+
+
+UResourceBundle* TimeZone::loadRule(const UResourceBundle* top, const UnicodeString& ruleid, UResourceBundle* oldbundle, UErrorCode& status) {
+    char key[64];
+    ruleid.extract(0, sizeof(key)-1, key, (int32_t)sizeof(key)-1, US_INV);
+    U_DEBUG_TZ_MSG(("loadRule(%s)\n", key));
+    UResourceBundle *r = ures_getByKey(top, kRULES, oldbundle, &status);
+    U_DEBUG_TZ_MSG(("loadRule(%s) -> kRULES [%s]\n", key, u_errorName(status)));
+    r = ures_getByKey(r, key, r, &status);
+    U_DEBUG_TZ_MSG(("loadRule(%s) -> item [%s]\n", key, u_errorName(status)));
+    return r;
+}
+
+/**
+ * Given an ID, open the appropriate resource for the given time zone.
+ * Dereference aliases if necessary.
+ * @param id zone id
+ * @param res resource, which must be ready for use (initialized but not open)
+ * @param ec input-output error code
+ * @return top-level resource bundle
+ */
+static UResourceBundle* openOlsonResource(const UnicodeString& id,
+                                          UResourceBundle& res,
+                                          UErrorCode& ec)
+{
+#if U_DEBUG_TZ
+    char buf[128];
+    id.extract(0, sizeof(buf)-1, buf, sizeof(buf), "");
+#endif
+    UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
+    U_DEBUG_TZ_MSG(("pre: res sz=%d\n", ures_getSize(&res)));
+    /* &res = */ getZoneByName(top, id, &res, ec);
+    // Dereference if this is an alias.  Docs say result should be 1
+    // but it is 0 in 2.8 (?).
+    U_DEBUG_TZ_MSG(("Loading zone '%s' (%s, size %d) - %s\n", buf, ures_getKey((UResourceBundle*)&res), ures_getSize(&res), u_errorName(ec)));
+    if (ures_getType(&res) == URES_INT) {
+        int32_t deref = ures_getInt(&res, &ec) + 0;
+        U_DEBUG_TZ_MSG(("getInt: %s - type is %d\n", u_errorName(ec), ures_getType(&res)));
+        UResourceBundle *ares = ures_getByKey(top, kZONES, NULL, &ec); // dereference Zones section
+        ures_getByIndex(ares, deref, &res, &ec);
+        ures_close(ares);
+        U_DEBUG_TZ_MSG(("alias to #%d (%s) - %s\n", deref, "??", u_errorName(ec)));
+    } else {
+        U_DEBUG_TZ_MSG(("not an alias - size %d\n", ures_getSize(&res)));
+    }
+    U_DEBUG_TZ_MSG(("%s - final status is %s\n", buf, u_errorName(ec)));
+    return top;
+}
+
+// -------------------------------------
+
+namespace {
+
+void U_CALLCONV initStaticTimeZones() {
+    // Initialize _GMT independently of other static data; it should
+    // be valid even if we can't load the time zone UDataMemory.
+    ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
+    _UNKNOWN_ZONE = new SimpleTimeZone(0, UnicodeString(TRUE, UNKNOWN_ZONE_ID, UNKNOWN_ZONE_ID_LENGTH));
+    _GMT = new SimpleTimeZone(0, UnicodeString(TRUE, GMT_ID, GMT_ID_LENGTH));
+}
+
+}  // anonymous namespace
+
+const TimeZone& U_EXPORT2
+TimeZone::getUnknown()
+{
+    umtx_initOnce(gStaticZonesInitOnce, &initStaticTimeZones);
+    return *_UNKNOWN_ZONE;
+}
+
+const TimeZone* U_EXPORT2
+TimeZone::getGMT(void)
+{
+    umtx_initOnce(gStaticZonesInitOnce, &initStaticTimeZones);
+    return _GMT;
+}
+
+// *****************************************************************************
+// class TimeZone
+// *****************************************************************************
+
+UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(TimeZone)
+
+TimeZone::TimeZone()
+    :   UObject(), fID()
+{
+}
+
+// -------------------------------------
+
+TimeZone::TimeZone(const UnicodeString &id)
+    :   UObject(), fID(id)
+{
+}
+
+// -------------------------------------
+
+TimeZone::~TimeZone()
+{
+}
+
+// -------------------------------------
+
+TimeZone::TimeZone(const TimeZone &source)
+    :   UObject(source), fID(source.fID)
+{
+}
+
+// -------------------------------------
+
+TimeZone &
+TimeZone::operator=(const TimeZone &right)
+{
+    if (this != &right) fID = right.fID;
+    return *this;
+}
+
+// -------------------------------------
+
+UBool
+TimeZone::operator==(const TimeZone& that) const
+{
+    return typeid(*this) == typeid(that) &&
+        fID == that.fID;
+}
+
+// -------------------------------------
+
+namespace {
+TimeZone*
+createSystemTimeZone(const UnicodeString& id, UErrorCode& ec) {
+    if (U_FAILURE(ec)) {
+        return NULL;
+    }
+    TimeZone* z = 0;
+    UResourceBundle res;
+    ures_initStackObject(&res);
+    U_DEBUG_TZ_MSG(("pre-err=%s\n", u_errorName(ec)));
+    UResourceBundle *top = openOlsonResource(id, res, ec);
+    U_DEBUG_TZ_MSG(("post-err=%s\n", u_errorName(ec)));
+    if (U_SUCCESS(ec)) {
+        z = new OlsonTimeZone(top, &res, id, ec);
+        if (z == NULL) {
+          U_DEBUG_TZ_MSG(("cstz: olson time zone failed to initialize - err %s\n", u_errorName(ec)));
+        }
+    }
+    ures_close(&res);
+    ures_close(top);
+    if (U_FAILURE(ec)) {
+        U_DEBUG_TZ_MSG(("cstz: failed to create, err %s\n", u_errorName(ec)));
+        delete z;
+        z = 0;
+    }
+    return z;
+}
+
+/**
+ * Lookup the given name in our system zone table.  If found,
+ * instantiate a new zone of that name and return it.  If not
+ * found, return 0.
+ */
+TimeZone*
+createSystemTimeZone(const UnicodeString& id) {
+    UErrorCode ec = U_ZERO_ERROR;
+    return createSystemTimeZone(id, ec);
+}
+
+}
+
+TimeZone* U_EXPORT2
+TimeZone::createTimeZone(const UnicodeString& ID)
+{
+    /* We first try to lookup the zone ID in our system list.  If this
+     * fails, we try to parse it as a custom string GMT[+-]hh:mm.  If
+     * all else fails, we return GMT, which is probably not what the
+     * user wants, but at least is a functioning TimeZone object.
+     *
+     * We cannot return NULL, because that would break compatibility
+     * with the JDK.
+     */
+    TimeZone* result = createSystemTimeZone(ID);
+
+    if (result == NULL) {
+        U_DEBUG_TZ_MSG(("failed to load system time zone with id - falling to custom"));
+        result = createCustomTimeZone(ID);
+    }
+    if (result == NULL) {
+        U_DEBUG_TZ_MSG(("failed to load time zone with id - falling to Etc/Unknown(GMT)"));
+        const TimeZone& unknown = getUnknown();
+        if (_UNKNOWN_ZONE == NULL) {                   // Cannot test (&unknown == NULL) because the
+          U_DEBUG_TZ_MSG(("failed to getUnknown()"));  // behavior of NULL references is undefined.
+        } else {
+          result = unknown.clone();
+        }
+    }
+    return result;
+}
+
+// -------------------------------------
+
+TimeZone* U_EXPORT2
+TimeZone::detectHostTimeZone()
+{
+    // We access system timezone data through TPlatformUtilities,
+    // including tzset(), timezone, and tzname[].
+    int32_t rawOffset = 0;
+    const char *hostID;
+
+    // First, try to create a system timezone, based
+    // on the string ID in tzname[0].
+
+    uprv_tzset(); // Initialize tz... system data
+
+    uprv_tzname_clear_cache();
+
+    // Get the timezone ID from the host.  This function should do
+    // any required host-specific remapping; e.g., on Windows this
+    // function maps the Date and Time control panel setting to an
+    // ICU timezone ID.
+    hostID = uprv_tzname(0);
+
+    // Invert sign because UNIX semantics are backwards
+    rawOffset = uprv_timezone() * -U_MILLIS_PER_SECOND;
+
+    TimeZone* hostZone = NULL;
+
+    /* Make sure that the string is NULL terminated to prevent BoundsChecker/Purify warnings. */
+    UnicodeString hostStrID(hostID, -1, US_INV);
+    hostStrID.append((UChar)0);
+    hostStrID.truncate(hostStrID.length()-1);
+    hostZone = createSystemTimeZone(hostStrID);
+
+#if U_PLATFORM_USES_ONLY_WIN32_API
+    // hostID points to a heap-allocated location on Windows.
+    uprv_free(const_cast<char *>(hostID));
+#endif
+
+    int32_t hostIDLen = hostStrID.length();
+    if (hostZone != NULL && rawOffset != hostZone->getRawOffset()
+        && (3 <= hostIDLen && hostIDLen <= 4))
+    {
+        // Uh oh. This probably wasn't a good id.
+        // It was probably an ambiguous abbreviation
+        delete hostZone;
+        hostZone = NULL;
+    }
+
+    // Construct a fixed standard zone with the host's ID
+    // and raw offset.
+    if (hostZone == NULL) {
+        hostZone = new SimpleTimeZone(rawOffset, hostStrID);
+    }
+
+    // If we _still_ don't have a time zone, use GMT.
+    //
+    // Note: This is extremely unlikely situation. If
+    // new SimpleTimeZone(...) above fails, the following
+    // code may also fail.
+    if (hostZone == NULL) {
+        const TimeZone* temptz = TimeZone::getGMT();
+        // If we can't use GMT, get out.
+        if (temptz == NULL) {
+            return NULL;
+        }
+        hostZone = temptz->clone();
+    }
+
+    return hostZone;
+}
+
+// -------------------------------------
+
+/**
+ * Initialize DEFAULT_ZONE from the system default time zone.  
+ * Upon return, DEFAULT_ZONE will not be NULL, unless operator new()
+ * returns NULL.
+ */
+static void U_CALLCONV initDefault()
+{
+    ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
+
+    // If setDefault() has already been called we can skip getting the
+    // default zone information from the system.
+    if (DEFAULT_ZONE != NULL) {
+        return;
+    }
+    
+    // NOTE:  this code is safely single threaded, being only
+    // run via umtx_initOnce().
+    //
+    // Some of the locale/timezone OS functions may not be thread safe,
+    //
+    // The operating system might actually use ICU to implement timezones.
+    // So we may have ICU calling ICU here, like on AIX.
+    // There shouldn't be a problem with this; initOnce does not hold a mutex
+    // while the init function is being run.
+
+    // The code detecting the host time zone was separated from this
+    // and implemented as TimeZone::detectHostTimeZone()
+
+    TimeZone *default_zone = TimeZone::detectHostTimeZone();
+
+    // The only way for DEFAULT_ZONE to be non-null at this point is if the user
+    // made a thread-unsafe call to setDefault() or adoptDefault() in another
+    // thread while this thread was doing something that required getting the default.
+    U_ASSERT(DEFAULT_ZONE == NULL);
+
+    DEFAULT_ZONE = default_zone;
+}
+
+// -------------------------------------
+
+TimeZone* U_EXPORT2
+TimeZone::createDefault()
+{
+    umtx_initOnce(gDefaultZoneInitOnce, initDefault);
+
+    Mutex mutex_lock(&gDefaultZoneMutex);
+    return (DEFAULT_ZONE != NULL) ? DEFAULT_ZONE->clone() : NULL;
+}
+
+void
+TimeZone::recreateDefault()
+{
+    TimeZone *default_zone = TimeZone::detectHostTimeZone();
+    adoptDefault(default_zone);
+}
+
+// -------------------------------------
+
+void U_EXPORT2
+TimeZone::adoptDefault(TimeZone* zone)
+{
+    if (zone != NULL)
+    {
+        Mutex mutex_lock(&gDefaultZoneMutex);
+        TimeZone *old = DEFAULT_ZONE;
+        DEFAULT_ZONE = zone;
+        delete old;
+        ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
+    }
+}
+// -------------------------------------
+
+void U_EXPORT2
+TimeZone::setDefault(const TimeZone& zone)
+{
+    adoptDefault(zone.clone());
+}
+
+//----------------------------------------------------------------------
+
+
+static void U_CALLCONV initMap(USystemTimeZoneType type, UErrorCode& ec) {
+    ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
+
+    UResourceBundle *res = ures_openDirect(0, kZONEINFO, &ec);
+    res = ures_getByKey(res, kNAMES, res, &ec); // dereference Zones section
+    if (U_SUCCESS(ec)) {
+        int32_t size = ures_getSize(res);
+        int32_t *m = (int32_t *)uprv_malloc(size * sizeof(int32_t));
+        if (m == NULL) {
+            ec = U_MEMORY_ALLOCATION_ERROR;
+        } else {
+            int32_t numEntries = 0;
+            for (int32_t i = 0; i < size; i++) {
+                UnicodeString id = ures_getUnicodeStringByIndex(res, i, &ec);
+                if (U_FAILURE(ec)) {
+                    break;
+                }
+                if (0 == id.compare(UNKNOWN_ZONE_ID, UNKNOWN_ZONE_ID_LENGTH)) {
+                    // exclude Etc/Unknown
+                    continue;
+                }
+                if (type == UCAL_ZONE_TYPE_CANONICAL || type == UCAL_ZONE_TYPE_CANONICAL_LOCATION) {
+                    UnicodeString canonicalID;
+                    ZoneMeta::getCanonicalCLDRID(id, canonicalID, ec);
+                    if (U_FAILURE(ec)) {
+                        break;
+                    }
+                    if (canonicalID != id) {
+                        // exclude aliases
+                        continue;
+                    }
+                }
+                if (type == UCAL_ZONE_TYPE_CANONICAL_LOCATION) {
+                    const UChar *region = TimeZone::getRegion(id, ec);
+                    if (U_FAILURE(ec)) {
+                        break;
+                    }
+                    if (u_strcmp(region, WORLD) == 0) {
+                       // exclude non-location ("001")
+                        continue;
+                    }
+                }
+                m[numEntries++] = i;
+            }
+            if (U_SUCCESS(ec)) {
+                int32_t *tmp = m;
+                m = (int32_t *)uprv_realloc(tmp, numEntries * sizeof(int32_t));
+                if (m == NULL) {
+                    // realloc failed.. use the original one even it has unused
+                    // area at the end
+                    m = tmp;
+                }
+
+                switch(type) {
+                case UCAL_ZONE_TYPE_ANY:
+                    U_ASSERT(MAP_SYSTEM_ZONES == NULL);
+                    MAP_SYSTEM_ZONES = m;
+                    LEN_SYSTEM_ZONES = numEntries;
+                    break;
+                case UCAL_ZONE_TYPE_CANONICAL:
+                    U_ASSERT(MAP_CANONICAL_SYSTEM_ZONES == NULL);
+                    MAP_CANONICAL_SYSTEM_ZONES = m;
+                    LEN_CANONICAL_SYSTEM_ZONES = numEntries;
+                    break;
+                case UCAL_ZONE_TYPE_CANONICAL_LOCATION:
+                    U_ASSERT(MAP_CANONICAL_SYSTEM_LOCATION_ZONES == NULL);
+                    MAP_CANONICAL_SYSTEM_LOCATION_ZONES = m;
+                    LEN_CANONICAL_SYSTEM_LOCATION_ZONES = numEntries;
+                    break;
+                }
+            }
+        }
+    }
+    ures_close(res);
+}
+
+
+/**
+ * This is the default implementation for subclasses that do not
+ * override this method.  This implementation calls through to the
+ * 8-argument getOffset() method after suitable computations, and
+ * correctly adjusts GMT millis to local millis when necessary.
+ */
+void TimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset,
+                         int32_t& dstOffset, UErrorCode& ec) const {
+    if (U_FAILURE(ec)) {
+        return;
+    }
+
+    rawOffset = getRawOffset();
+    if (!local) {
+        date += rawOffset; // now in local standard millis
+    }
+
+    // When local == TRUE, date might not be in local standard
+    // millis.  getOffset taking 7 parameters used here assume
+    // the given time in day is local standard time.
+    // At STD->DST transition, there is a range of time which
+    // does not exist.  When 'date' is in this time range
+    // (and local == TRUE), this method interprets the specified
+    // local time as DST.  At DST->STD transition, there is a
+    // range of time which occurs twice.  In this case, this
+    // method interprets the specified local time as STD.
+    // To support the behavior above, we need to call getOffset
+    // (with 7 args) twice when local == true and DST is
+    // detected in the initial call.
+    for (int32_t pass=0; ; ++pass) {
+        int32_t year, month, dom, dow;
+        double day = uprv_floor(date / U_MILLIS_PER_DAY);
+        int32_t millis = (int32_t) (date - day * U_MILLIS_PER_DAY);
+
+        Grego::dayToFields(day, year, month, dom, dow);
+
+        dstOffset = getOffset(GregorianCalendar::AD, year, month, dom,
+                              (uint8_t) dow, millis,
+                              Grego::monthLength(year, month),
+                              ec) - rawOffset;
+
+        // Recompute if local==TRUE, dstOffset!=0.
+        if (pass!=0 || !local || dstOffset == 0) {
+            break;
+        }
+        // adjust to local standard millis
+        date -= dstOffset;
+    }
+}
+
+// -------------------------------------
+
+// New available IDs API as of ICU 2.4.  Uses StringEnumeration API.
+
+class TZEnumeration : public StringEnumeration {
+private:
+
+    // Map into to zones.  Our results are zone[map[i]] for
+    // i=0..len-1, where zone[i] is the i-th Olson zone.  If map==NULL
+    // then our results are zone[i] for i=0..len-1.  Len will be zero
+    // if the zone data could not be loaded.
+    int32_t* map;
+    int32_t* localMap;
+    int32_t  len;
+    int32_t  pos;
+
+    TZEnumeration(int32_t* mapData, int32_t mapLen, UBool adoptMapData) : pos(0) {
+        map = mapData;
+        localMap = adoptMapData ? mapData : NULL;
+        len = mapLen;
+    }
+
+    UBool getID(int32_t i) {
+        UErrorCode ec = U_ZERO_ERROR;
+        int32_t idLen = 0;
+        const UChar* id = NULL;
+        UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
+        top = ures_getByKey(top, kNAMES, top, &ec); // dereference Zones section
+        id = ures_getStringByIndex(top, i, &idLen, &ec);
+        if(U_FAILURE(ec)) {
+            unistr.truncate(0);
+        }
+        else {
+            unistr.fastCopyFrom(UnicodeString(TRUE, id, idLen));
+        }
+        ures_close(top);
+        return U_SUCCESS(ec);
+    }
+
+    static int32_t* getMap(USystemTimeZoneType type, int32_t& len, UErrorCode& ec) {
+        len = 0;
+        if (U_FAILURE(ec)) {
+            return NULL;
+        }
+        int32_t* m = NULL;
+        switch (type) {
+        case UCAL_ZONE_TYPE_ANY:
+            umtx_initOnce(gSystemZonesInitOnce, &initMap, type, ec);
+            m = MAP_SYSTEM_ZONES;
+            len = LEN_SYSTEM_ZONES;
+            break;
+        case UCAL_ZONE_TYPE_CANONICAL:
+            umtx_initOnce(gCanonicalZonesInitOnce, &initMap, type, ec);
+            m = MAP_CANONICAL_SYSTEM_ZONES;
+            len = LEN_CANONICAL_SYSTEM_ZONES;
+            break;
+        case UCAL_ZONE_TYPE_CANONICAL_LOCATION:
+            umtx_initOnce(gCanonicalLocationZonesInitOnce, &initMap, type, ec);
+            m = MAP_CANONICAL_SYSTEM_LOCATION_ZONES;
+            len = LEN_CANONICAL_SYSTEM_LOCATION_ZONES;
+            break;
+        default:
+            ec = U_ILLEGAL_ARGUMENT_ERROR;
+            m = NULL;
+            len = 0;
+            break;
+        }
+        return m;
+    }
+
+public:
+
+#define DEFAULT_FILTERED_MAP_SIZE 8
+#define MAP_INCREMENT_SIZE 8
+
+    static TZEnumeration* create(USystemTimeZoneType type, const char* region, const int32_t* rawOffset, UErrorCode& ec) {
+        if (U_FAILURE(ec)) {
+            return NULL;
+        }
+
+        int32_t baseLen;
+        int32_t *baseMap = getMap(type, baseLen, ec);
+
+        if (U_FAILURE(ec)) {
+            return NULL;
+        }
+
+        // If any additional conditions are available,
+        // create instance local map filtered by the conditions.
+
+        int32_t *filteredMap = NULL;
+        int32_t numEntries = 0;
+
+        if (region != NULL || rawOffset != NULL) {
+            int32_t filteredMapSize = DEFAULT_FILTERED_MAP_SIZE;
+            filteredMap = (int32_t *)uprv_malloc(filteredMapSize * sizeof(int32_t));
+            if (filteredMap == NULL) {
+                ec = U_MEMORY_ALLOCATION_ERROR;
+                return NULL;
+            }
+
+            // Walk through the base map
+            UResourceBundle *res = ures_openDirect(0, kZONEINFO, &ec);
+            res = ures_getByKey(res, kNAMES, res, &ec); // dereference Zones section
+            for (int32_t i = 0; i < baseLen; i++) {
+                int32_t zidx = baseMap[i];
+                UnicodeString id = ures_getUnicodeStringByIndex(res, zidx, &ec);
+                if (U_FAILURE(ec)) {
+                    break;
+                }
+                if (region != NULL) {
+                    // Filter by region
+                    char tzregion[4]; // max 3 letters + null term
+                    TimeZone::getRegion(id, tzregion, sizeof(tzregion), ec);
+                    if (U_FAILURE(ec)) {
+                        break;
+                    }
+                    if (uprv_stricmp(tzregion, region) != 0) {
+                        // region does not match
+                        continue;
+                    }
+                }
+                if (rawOffset != NULL) {
+                    // Filter by raw offset
+                    // Note: This is VERY inefficient
+                    TimeZone *z = createSystemTimeZone(id, ec);
+                    if (U_FAILURE(ec)) {
+                        break;
+                    }
+                    int32_t tzoffset = z->getRawOffset();
+                    delete z;
+
+                    if (tzoffset != *rawOffset) {
+                        continue;
+                    }
+                }
+
+                if (filteredMapSize <= numEntries) {
+                    filteredMapSize += MAP_INCREMENT_SIZE;
+                    int32_t *tmp = (int32_t *)uprv_realloc(filteredMap, filteredMapSize * sizeof(int32_t));
+                    if (tmp == NULL) {
+                        ec = U_MEMORY_ALLOCATION_ERROR;
+                        break;
+                    } else {
+                        filteredMap = tmp;
+                    }
+                }
+
+                filteredMap[numEntries++] = zidx;
+            }
+
+            if (U_FAILURE(ec)) {
+                uprv_free(filteredMap);
+                filteredMap = NULL;
+            }
+
+            ures_close(res);
+        }
+
+        TZEnumeration *result = NULL;
+        if (U_SUCCESS(ec)) {
+            // Finally, create a new enumeration instance
+            if (filteredMap == NULL) {
+                result = new TZEnumeration(baseMap, baseLen, FALSE);
+            } else {
+                result = new TZEnumeration(filteredMap, numEntries, TRUE);
+                filteredMap = NULL;
+            }
+            if (result == NULL) {
+                ec = U_MEMORY_ALLOCATION_ERROR;
+            }
+        }
+
+        if (filteredMap != NULL) {
+            uprv_free(filteredMap);
+        }
+
+        return result;
+    }
+
+    TZEnumeration(const TZEnumeration &other) : StringEnumeration(), map(NULL), localMap(NULL), len(0), pos(0) {
+        if (other.localMap != NULL) {
+            localMap = (int32_t *)uprv_malloc(other.len * sizeof(int32_t));
+            if (localMap != NULL) {
+                len = other.len;
+                uprv_memcpy(localMap, other.localMap, len * sizeof(int32_t));
+                pos = other.pos;
+                map = localMap;
+            } else {
+                len = 0;
+                pos = 0;
+                map = NULL;
+            }
+        } else {
+            map = other.map;
+            localMap = NULL;
+            len = other.len;
+            pos = other.pos;
+        }
+    }
+
+    virtual ~TZEnumeration();
+
+    virtual StringEnumeration *clone() const {
+        return new TZEnumeration(*this);
+    }
+
+    virtual int32_t count(UErrorCode& status) const {
+        return U_FAILURE(status) ? 0 : len;
+    }
+
+    virtual const UnicodeString* snext(UErrorCode& status) {
+        if (U_SUCCESS(status) && map != NULL && pos < len) {
+            getID(map[pos]);
+            ++pos;
+            return &unistr;
+        }
+        return 0;
+    }
+
+    virtual void reset(UErrorCode& /*status*/) {
+        pos = 0;
+    }
+
+public:
+    static UClassID U_EXPORT2 getStaticClassID(void);
+    virtual UClassID getDynamicClassID(void) const;
+};
+
+TZEnumeration::~TZEnumeration() {
+    if (localMap != NULL) {
+        uprv_free(localMap);
+    }
+}
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TZEnumeration)
+
+StringEnumeration* U_EXPORT2
+TimeZone::createTimeZoneIDEnumeration(
+            USystemTimeZoneType zoneType,
+            const char* region,
+            const int32_t* rawOffset,
+            UErrorCode& ec) {
+    return TZEnumeration::create(zoneType, region, rawOffset, ec);
+}
+
+StringEnumeration* U_EXPORT2
+TimeZone::createEnumeration() {
+    UErrorCode ec = U_ZERO_ERROR;
+    return TZEnumeration::create(UCAL_ZONE_TYPE_ANY, NULL, NULL, ec);
+}
+
+StringEnumeration* U_EXPORT2
+TimeZone::createEnumeration(int32_t rawOffset) {
+    UErrorCode ec = U_ZERO_ERROR;
+    return TZEnumeration::create(UCAL_ZONE_TYPE_ANY, NULL, &rawOffset, ec);
+}
+
+StringEnumeration* U_EXPORT2
+TimeZone::createEnumeration(const char* country) {
+    UErrorCode ec = U_ZERO_ERROR;
+    return TZEnumeration::create(UCAL_ZONE_TYPE_ANY, country, NULL, ec);
+}
+
+// ---------------------------------------
+
+int32_t U_EXPORT2
+TimeZone::countEquivalentIDs(const UnicodeString& id) {
+    int32_t result = 0;
+    UErrorCode ec = U_ZERO_ERROR;
+    UResourceBundle res;
+    ures_initStackObject(&res);
+    U_DEBUG_TZ_MSG(("countEquivalentIDs..\n"));
+    UResourceBundle *top = openOlsonResource(id, res, ec);
+    if (U_SUCCESS(ec)) {
+        UResourceBundle r;
+        ures_initStackObject(&r);
+        ures_getByKey(&res, kLINKS, &r, &ec);
+        ures_getIntVector(&r, &result, &ec);
+        ures_close(&r);
+    }
+    ures_close(&res);
+    ures_close(top);
+    return result;
+}
+
+// ---------------------------------------
+
+const UnicodeString U_EXPORT2
+TimeZone::getEquivalentID(const UnicodeString& id, int32_t index) {
+    U_DEBUG_TZ_MSG(("gEI(%d)\n", index));
+    UnicodeString result;
+    UErrorCode ec = U_ZERO_ERROR;
+    UResourceBundle res;
+    ures_initStackObject(&res);
+    UResourceBundle *top = openOlsonResource(id, res, ec);
+    int32_t zone = -1;
+    if (U_SUCCESS(ec)) {
+        UResourceBundle r;
+        ures_initStackObject(&r);
+        int32_t size;
+        ures_getByKey(&res, kLINKS, &r, &ec);
+        const int32_t* v = ures_getIntVector(&r, &size, &ec);
+        if (U_SUCCESS(ec)) {
+            if (index >= 0 && index < size) {
+                zone = v[index];
+            }
+        }
+        ures_close(&r);
+    }
+    ures_close(&res);
+    if (zone >= 0) {
+        UResourceBundle *ares = ures_getByKey(top, kNAMES, NULL, &ec); // dereference Zones section
+        if (U_SUCCESS(ec)) {
+            int32_t idLen = 0;
+            const UChar* id = ures_getStringByIndex(ares, zone, &idLen, &ec);
+            result.fastCopyFrom(UnicodeString(TRUE, id, idLen));
+            U_DEBUG_TZ_MSG(("gei(%d) -> %d, len%d, %s\n", index, zone, result.length(), u_errorName(ec)));
+        }
+        ures_close(ares);
+    }
+    ures_close(top);
+#if defined(U_DEBUG_TZ)
+    if(result.length() ==0) {
+      U_DEBUG_TZ_MSG(("equiv [__, #%d] -> 0 (%s)\n", index, u_errorName(ec)));
+    }
+#endif
+    return result;
+}
+
+// ---------------------------------------
+
+// These methods are used by ZoneMeta class only.
+
+const UChar*
+TimeZone::findID(const UnicodeString& id) {
+    const UChar *result = NULL;
+    UErrorCode ec = U_ZERO_ERROR;
+    UResourceBundle *rb = ures_openDirect(NULL, kZONEINFO, &ec);
+
+    // resolve zone index by name
+    UResourceBundle *names = ures_getByKey(rb, kNAMES, NULL, &ec);
+    int32_t idx = findInStringArray(names, id, ec);
+    result = ures_getStringByIndex(names, idx, NULL, &ec);
+    if (U_FAILURE(ec)) {
+        result = NULL;
+    }
+    ures_close(names);
+    ures_close(rb);
+    return result;
+}
+
+
+const UChar*
+TimeZone::dereferOlsonLink(const UnicodeString& id) {
+    const UChar *result = NULL;
+    UErrorCode ec = U_ZERO_ERROR;
+    UResourceBundle *rb = ures_openDirect(NULL, kZONEINFO, &ec);
+
+    // resolve zone index by name
+    UResourceBundle *names = ures_getByKey(rb, kNAMES, NULL, &ec);
+    int32_t idx = findInStringArray(names, id, ec);
+    result = ures_getStringByIndex(names, idx, NULL, &ec);
+
+    // open the zone bundle by index
+    ures_getByKey(rb, kZONES, rb, &ec);
+    ures_getByIndex(rb, idx, rb, &ec); 
+
+    if (U_SUCCESS(ec)) {
+        if (ures_getType(rb) == URES_INT) {
+            // this is a link - dereference the link
+            int32_t deref = ures_getInt(rb, &ec);
+            const UChar* tmp = ures_getStringByIndex(names, deref, NULL, &ec);
+            if (U_SUCCESS(ec)) {
+                result = tmp;
+            }
+        }
+    }
+
+    ures_close(names);
+    ures_close(rb);
+
+    return result;
+}
+
+const UChar*
+TimeZone::getRegion(const UnicodeString& id) {
+    UErrorCode status = U_ZERO_ERROR;
+    return getRegion(id, status);
+}
+
+const UChar*
+TimeZone::getRegion(const UnicodeString& id, UErrorCode& status) {
+    if (U_FAILURE(status)) {
+        return NULL;
+    }
+    const UChar *result = NULL;
+    UResourceBundle *rb = ures_openDirect(NULL, kZONEINFO, &status);
+
+    // resolve zone index by name
+    UResourceBundle *res = ures_getByKey(rb, kNAMES, NULL, &status);
+    int32_t idx = findInStringArray(res, id, status);
+
+    // get region mapping
+    ures_getByKey(rb, kREGIONS, res, &status);
+    const UChar *tmp = ures_getStringByIndex(res, idx, NULL, &status);
+    if (U_SUCCESS(status)) {
+        result = tmp;
+    }
+
+    ures_close(res);
+    ures_close(rb);
+
+    return result;
+}
+
+
+// ---------------------------------------
+int32_t
+TimeZone::getRegion(const UnicodeString& id, char *region, int32_t capacity, UErrorCode& status)
+{
+    int32_t resultLen = 0;
+    *region = 0;
+    if (U_FAILURE(status)) {
+        return 0;
+    }
+
+    const UChar *uregion = NULL;
+    // "Etc/Unknown" is not a system zone ID,
+    // but in the zone data
+    if (id.compare(UNKNOWN_ZONE_ID, UNKNOWN_ZONE_ID_LENGTH) != 0) {
+        uregion = getRegion(id);
+    }
+    if (uregion == NULL) {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+    resultLen = u_strlen(uregion);
+    // A region code is represented by invariant characters
+    u_UCharsToChars(uregion, region, uprv_min(resultLen, capacity));
+
+    if (capacity < resultLen) {
+        status = U_BUFFER_OVERFLOW_ERROR;
+        return resultLen;
+    }
+
+    return u_terminateChars(region, capacity, resultLen, &status);
+}
+
+// ---------------------------------------
+
+
+UnicodeString&
+TimeZone::getDisplayName(UnicodeString& result) const
+{
+    return getDisplayName(FALSE,LONG,Locale::getDefault(), result);
+}
+
+UnicodeString&
+TimeZone::getDisplayName(const Locale& locale, UnicodeString& result) const
+{
+    return getDisplayName(FALSE, LONG, locale, result);
+}
+
+UnicodeString&
+TimeZone::getDisplayName(UBool daylight, EDisplayType style, UnicodeString& result)  const
+{
+    return getDisplayName(daylight,style, Locale::getDefault(), result);
+}
+//--------------------------------------
+int32_t
+TimeZone::getDSTSavings()const {
+    if (useDaylightTime()) {
+        return 3600000;
+    }
+    return 0;
+}
+//---------------------------------------
+UnicodeString&
+TimeZone::getDisplayName(UBool daylight, EDisplayType style, const Locale& locale, UnicodeString& result) const
+{
+    UErrorCode status = U_ZERO_ERROR;
+    UDate date = Calendar::getNow();
+    UTimeZoneFormatTimeType timeType;
+    int32_t offset;
+
+    if (style == GENERIC_LOCATION || style == LONG_GENERIC || style == SHORT_GENERIC) {
+        LocalPointer<TimeZoneFormat> tzfmt(TimeZoneFormat::createInstance(locale, status));
+        if (U_FAILURE(status)) {
+            result.remove();
+            return result;
+        }
+        // Generic format
+        switch (style) {
+        case GENERIC_LOCATION:
+            tzfmt->format(UTZFMT_STYLE_GENERIC_LOCATION, *this, date, result, &timeType);
+            break;
+        case LONG_GENERIC:
+            tzfmt->format(UTZFMT_STYLE_GENERIC_LONG, *this, date, result, &timeType);
+            break;
+        case SHORT_GENERIC:
+            tzfmt->format(UTZFMT_STYLE_GENERIC_SHORT, *this, date, result, &timeType);
+            break;
+        default:
+            U_ASSERT(FALSE);
+        }
+        // Generic format many use Localized GMT as the final fallback.
+        // When Localized GMT format is used, the result might not be
+        // appropriate for the requested daylight value.
+        if ((daylight && timeType == UTZFMT_TIME_TYPE_STANDARD) || (!daylight && timeType == UTZFMT_TIME_TYPE_DAYLIGHT)) {
+            offset = daylight ? getRawOffset() + getDSTSavings() : getRawOffset();
+            if (style == SHORT_GENERIC) {
+                tzfmt->formatOffsetShortLocalizedGMT(offset, result, status);
+            } else {
+                tzfmt->formatOffsetLocalizedGMT(offset, result, status);
+            }
+        }
+    } else if (style == LONG_GMT || style == SHORT_GMT) {
+        LocalPointer<TimeZoneFormat> tzfmt(TimeZoneFormat::createInstance(locale, status));
+        if (U_FAILURE(status)) {
+            result.remove();
+            return result;
+        }
+        offset = daylight && useDaylightTime() ? getRawOffset() + getDSTSavings() : getRawOffset();
+        switch (style) {
+        case LONG_GMT:
+            tzfmt->formatOffsetLocalizedGMT(offset, result, status);
+            break;
+        case SHORT_GMT:
+            tzfmt->formatOffsetISO8601Basic(offset, FALSE, FALSE, FALSE, result, status);
+            break;
+        default:
+            U_ASSERT(FALSE);
+        }
+
+    } else {
+        U_ASSERT(style == LONG || style == SHORT || style == SHORT_COMMONLY_USED);
+        UTimeZoneNameType nameType = UTZNM_UNKNOWN;
+        switch (style) {
+        case LONG:
+            nameType = daylight ? UTZNM_LONG_DAYLIGHT : UTZNM_LONG_STANDARD;
+            break;
+        case SHORT:
+        case SHORT_COMMONLY_USED:
+            nameType = daylight ? UTZNM_SHORT_DAYLIGHT : UTZNM_SHORT_STANDARD;
+            break;
+        default:
+            U_ASSERT(FALSE);
+        }
+        LocalPointer<TimeZoneNames> tznames(TimeZoneNames::createInstance(locale, status));
+        if (U_FAILURE(status)) {
+            result.remove();
+            return result;
+        }
+        UnicodeString canonicalID(ZoneMeta::getCanonicalCLDRID(*this));
+        tznames->getDisplayName(canonicalID, nameType, date, result);
+        if (result.isEmpty()) {
+            // Fallback to localized GMT
+            LocalPointer<TimeZoneFormat> tzfmt(TimeZoneFormat::createInstance(locale, status));
+            offset = daylight && useDaylightTime() ? getRawOffset() + getDSTSavings() : getRawOffset();
+            if (style == LONG) {
+                tzfmt->formatOffsetLocalizedGMT(offset, result, status);
+            } else {
+                tzfmt->formatOffsetShortLocalizedGMT(offset, result, status);
+            }
+        }
+    }
+    if (U_FAILURE(status)) {
+        result.remove();
+    }
+    return  result;
+}
+
+/**
+ * Parse a custom time zone identifier and return a corresponding zone.
+ * @param id a string of the form GMT[+-]hh:mm, GMT[+-]hhmm, or
+ * GMT[+-]hh.
+ * @return a newly created SimpleTimeZone with the given offset and
+ * no Daylight Savings Time, or null if the id cannot be parsed.
+*/
+TimeZone*
+TimeZone::createCustomTimeZone(const UnicodeString& id)
+{
+    int32_t sign, hour, min, sec;
+    if (parseCustomID(id, sign, hour, min, sec)) {
+        UnicodeString customID;
+        formatCustomID(hour, min, sec, (sign < 0), customID);
+        int32_t offset = sign * ((hour * 60 + min) * 60 + sec) * 1000;
+        return new SimpleTimeZone(offset, customID);
+    }
+    return NULL;
+}
+
+UnicodeString&
+TimeZone::getCustomID(const UnicodeString& id, UnicodeString& normalized, UErrorCode& status) {
+    normalized.remove();
+    if (U_FAILURE(status)) {
+        return normalized;
+    }
+    int32_t sign, hour, min, sec;
+    if (parseCustomID(id, sign, hour, min, sec)) {
+        formatCustomID(hour, min, sec, (sign < 0), normalized);
+    } else {
+        status = U_ILLEGAL_ARGUMENT_ERROR;
+    }
+    return normalized;
+}
+
+UBool
+TimeZone::parseCustomID(const UnicodeString& id, int32_t& sign,
+                        int32_t& hour, int32_t& min, int32_t& sec) {
+    static const int32_t         kParseFailed = -99999;
+
+    NumberFormat* numberFormat = 0;
+    UnicodeString idUppercase = id;
+    idUppercase.toUpper("");
+
+    if (id.length() > GMT_ID_LENGTH &&
+        idUppercase.startsWith(GMT_ID, GMT_ID_LENGTH))
+    {
+        ParsePosition pos(GMT_ID_LENGTH);
+        sign = 1;
+        hour = 0;
+        min = 0;
+        sec = 0;
+
+        if (id[pos.getIndex()] == MINUS /*'-'*/) {
+            sign = -1;
+        } else if (id[pos.getIndex()] != PLUS /*'+'*/) {
+            return FALSE;
+        }
+        pos.setIndex(pos.getIndex() + 1);
+
+        UErrorCode success = U_ZERO_ERROR;
+        numberFormat = NumberFormat::createInstance(success);
+        if(U_FAILURE(success)){
+            return FALSE;
+        }
+        numberFormat->setParseIntegerOnly(TRUE);
+        //numberFormat->setLenient(TRUE); // TODO: May need to set this, depends on latest timezone parsing
+
+        // Look for either hh:mm, hhmm, or hh
+        int32_t start = pos.getIndex();
+        Formattable n(kParseFailed);
+        numberFormat->parse(id, n, pos);
+        if (pos.getIndex() == start) {
+            delete numberFormat;
+            return FALSE;
+        }
+        hour = n.getLong();
+
+        if (pos.getIndex() < id.length()) {
+            if (pos.getIndex() - start > 2
+                || id[pos.getIndex()] != COLON) {
+                delete numberFormat;
+                return FALSE;
+            }
+            // hh:mm
+            pos.setIndex(pos.getIndex() + 1);
+            int32_t oldPos = pos.getIndex();
+            n.setLong(kParseFailed);
+            numberFormat->parse(id, n, pos);
+            if ((pos.getIndex() - oldPos) != 2) {
+                // must be 2 digits
+                delete numberFormat;
+                return FALSE;
+            }
+            min = n.getLong();
+            if (pos.getIndex() < id.length()) {
+                if (id[pos.getIndex()] != COLON) {
+                    delete numberFormat;
+                    return FALSE;
+                }
+                // [:ss]
+                pos.setIndex(pos.getIndex() + 1);
+                oldPos = pos.getIndex();
+                n.setLong(kParseFailed);
+                numberFormat->parse(id, n, pos);
+                if (pos.getIndex() != id.length()
+                        || (pos.getIndex() - oldPos) != 2) {
+                    delete numberFormat;
+                    return FALSE;
+                }
+                sec = n.getLong();
+            }
+        } else {
+            // Supported formats are below -
+            //
+            // HHmmss
+            // Hmmss
+            // HHmm
+            // Hmm
+            // HH
+            // H
+
+            int32_t length = pos.getIndex() - start;
+            if (length <= 0 || 6 < length) {
+                // invalid length
+                delete numberFormat;
+                return FALSE;
+            }
+            switch (length) {
+                case 1:
+                case 2:
+                    // already set to hour
+                    break;
+                case 3:
+                case 4:
+                    min = hour % 100;
+                    hour /= 100;
+                    break;
+                case 5:
+                case 6:
+                    sec = hour % 100;
+                    min = (hour/100) % 100;
+                    hour /= 10000;
+                    break;
+            }
+        }
+
+        delete numberFormat;
+
+        if (hour > kMAX_CUSTOM_HOUR || min > kMAX_CUSTOM_MIN || sec > kMAX_CUSTOM_SEC) {
+            return FALSE;
+        }
+        return TRUE;
+    }
+    return FALSE;
+}
+
+UnicodeString&
+TimeZone::formatCustomID(int32_t hour, int32_t min, int32_t sec,
+                         UBool negative, UnicodeString& id) {
+    // Create time zone ID - GMT[+|-]hhmm[ss]
+    id.setTo(GMT_ID, GMT_ID_LENGTH);
+    if (hour | min | sec) {
+        if (negative) {
+            id += (UChar)MINUS;
+        } else {
+            id += (UChar)PLUS;
+        }
+
+        if (hour < 10) {
+            id += (UChar)ZERO_DIGIT;
+        } else {
+            id += (UChar)(ZERO_DIGIT + hour/10);
+        }
+        id += (UChar)(ZERO_DIGIT + hour%10);
+        id += (UChar)COLON;
+        if (min < 10) {
+            id += (UChar)ZERO_DIGIT;
+        } else {
+            id += (UChar)(ZERO_DIGIT + min/10);
+        }
+        id += (UChar)(ZERO_DIGIT + min%10);
+
+        if (sec) {
+            id += (UChar)COLON;
+            if (sec < 10) {
+                id += (UChar)ZERO_DIGIT;
+            } else {
+                id += (UChar)(ZERO_DIGIT + sec/10);
+            }
+            id += (UChar)(ZERO_DIGIT + sec%10);
+        }
+    }
+    return id;
+}
+
+
+UBool
+TimeZone::hasSameRules(const TimeZone& other) const
+{
+    return (getRawOffset() == other.getRawOffset() &&
+            useDaylightTime() == other.useDaylightTime());
+}
+
+static void U_CALLCONV initTZDataVersion(UErrorCode &status) {
+    ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
+    int32_t len = 0;
+    UResourceBundle *bundle = ures_openDirect(NULL, kZONEINFO, &status);
+    const UChar *tzver = ures_getStringByKey(bundle, kTZVERSION, &len, &status);
+
+    if (U_SUCCESS(status)) {
+        if (len >= (int32_t)sizeof(TZDATA_VERSION)) {
+            // Ensure that there is always space for a trailing nul in TZDATA_VERSION
+            len = sizeof(TZDATA_VERSION) - 1;
+        }
+        u_UCharsToChars(tzver, TZDATA_VERSION, len);
+    }
+    ures_close(bundle);
+
+}
+
+const char*
+TimeZone::getTZDataVersion(UErrorCode& status)
+{
+    umtx_initOnce(gTZDataVersionInitOnce, &initTZDataVersion, status);
+    return (const char*)TZDATA_VERSION;
+}
+
+UnicodeString&
+TimeZone::getCanonicalID(const UnicodeString& id, UnicodeString& canonicalID, UErrorCode& status)
+{
+    UBool isSystemID = FALSE;
+    return getCanonicalID(id, canonicalID, isSystemID, status);
+}
+
+UnicodeString&
+TimeZone::getCanonicalID(const UnicodeString& id, UnicodeString& canonicalID, UBool& isSystemID,
+                         UErrorCode& status)
+{
+    canonicalID.remove();
+    isSystemID = FALSE;
+    if (U_FAILURE(status)) {
+        return canonicalID;
+    }
+    if (id.compare(UNKNOWN_ZONE_ID, UNKNOWN_ZONE_ID_LENGTH) == 0) {
+        // special case - Etc/Unknown is a canonical ID, but not system ID
+        canonicalID.fastCopyFrom(id);
+        isSystemID = FALSE;
+    } else {
+        ZoneMeta::getCanonicalCLDRID(id, canonicalID, status);
+        if (U_SUCCESS(status)) {
+            isSystemID = TRUE;
+        } else {
+            // Not a system ID
+            status = U_ZERO_ERROR;
+            getCustomID(id, canonicalID, status);
+        }
+    }
+    return canonicalID;
+}
+
+UnicodeString&
+TimeZone::getWindowsID(const UnicodeString& id, UnicodeString& winid, UErrorCode& status) {
+    winid.remove();
+    if (U_FAILURE(status)) {
+        return winid;
+    }
+
+    // canonicalize the input ID
+    UnicodeString canonicalID;
+    UBool isSystemID = FALSE;
+
+    getCanonicalID(id, canonicalID, isSystemID, status);
+    if (U_FAILURE(status) || !isSystemID) {
+        // mapping data is only applicable to tz database IDs
+        if (status == U_ILLEGAL_ARGUMENT_ERROR) {
+            // getWindowsID() sets an empty string where
+            // getCanonicalID() sets a U_ILLEGAL_ARGUMENT_ERROR.
+            status = U_ZERO_ERROR;
+        }
+        return winid;
+    }
+
+    UResourceBundle *mapTimezones = ures_openDirect(NULL, "windowsZones", &status);
+    ures_getByKey(mapTimezones, "mapTimezones", mapTimezones, &status);
+
+    if (U_FAILURE(status)) {
+        return winid;
+    }
+
+    UResourceBundle *winzone = NULL;
+    UBool found = FALSE;
+    while (ures_hasNext(mapTimezones) && !found) {
+        winzone = ures_getNextResource(mapTimezones, winzone, &status);
+        if (U_FAILURE(status)) {
+            break;
+        }
+        if (ures_getType(winzone) != URES_TABLE) {
+            continue;
+        }
+        UResourceBundle *regionalData = NULL;
+        while (ures_hasNext(winzone) && !found) {
+            regionalData = ures_getNextResource(winzone, regionalData, &status);
+            if (U_FAILURE(status)) {
+                break;
+            }
+            if (ures_getType(regionalData) != URES_STRING) {
+                continue;
+            }
+            int32_t len;
+            const UChar *tzids = ures_getString(regionalData, &len, &status);
+            if (U_FAILURE(status)) {
+                break;
+            }
+
+            const UChar *start = tzids;
+            UBool hasNext = TRUE;
+            while (hasNext) {
+                const UChar *end = u_strchr(start, (UChar)0x20);
+                if (end == NULL) {
+                    end = tzids + len;
+                    hasNext = FALSE;
+                }
+                if (canonicalID.compare(start, end - start) == 0) {
+                    winid = UnicodeString(ures_getKey(winzone), -1 , US_INV);
+                    found = TRUE;
+                    break;
+                }
+                start = end + 1;
+            }
+        }
+        ures_close(regionalData);
+    }
+    ures_close(winzone);
+    ures_close(mapTimezones);
+
+    return winid;
+}
+
+#define MAX_WINDOWS_ID_SIZE 128
+
+UnicodeString&
+TimeZone::getIDForWindowsID(const UnicodeString& winid, const char* region, UnicodeString& id, UErrorCode& status) {
+    id.remove();
+    if (U_FAILURE(status)) {
+        return id;
+    }
+
+    UResourceBundle *zones = ures_openDirect(NULL, "windowsZones", &status);
+    ures_getByKey(zones, "mapTimezones", zones, &status);
+    if (U_FAILURE(status)) {
+        ures_close(zones);
+        return id;
+    }
+
+    UErrorCode tmperr = U_ZERO_ERROR;
+    char winidKey[MAX_WINDOWS_ID_SIZE];
+    int32_t winKeyLen = winid.extract(0, winid.length(), winidKey, sizeof(winidKey) - 1, US_INV);
+
+    if (winKeyLen == 0 || winKeyLen >= (int32_t)sizeof(winidKey)) {
+        ures_close(zones);
+        return id;
+    }
+    winidKey[winKeyLen] = 0;
+
+    ures_getByKey(zones, winidKey, zones, &tmperr); // use tmperr, because windows mapping might not
+                                                    // be avaiable by design
+    if (U_FAILURE(tmperr)) {
+        ures_close(zones);
+        return id;
+    }
+
+    const UChar *tzid = NULL;
+    int32_t len = 0;
+    UBool gotID = FALSE;
+    if (region) {
+        const UChar *tzids = ures_getStringByKey(zones, region, &len, &tmperr); // use tmperr, because
+                                                                                // regional mapping is optional
+        if (U_SUCCESS(tmperr)) {
+            // first ID delimited by space is the defasult one
+            const UChar *end = u_strchr(tzids, (UChar)0x20);
+            if (end == NULL) {
+                id.setTo(tzids, -1);
+            } else {
+                id.setTo(tzids, end - tzids);
+            }
+            gotID = TRUE;
+        }
+    }
+
+    if (!gotID) {
+        tzid = ures_getStringByKey(zones, "001", &len, &status);    // using status, because "001" must be
+                                                                // available at this point
+        if (U_SUCCESS(status)) {
+            id.setTo(tzid, len);
+        }
+    }
+
+    ures_close(zones);
+    return id;
+}
+
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+//eof