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skia / external / github.com / unicode-org / icu / refs/heads/icu-maint/maint-4-3 / . / source / i18n / timezone.cpp
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/*
*******************************************************************************
* Copyright (C) 1997-2009, 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 "unicode/utypes.h"
#include "unicode/ustring.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/smpdtfmt.h"
#include "unicode/calendar.h"
#include "unicode/gregocal.h"
#include "unicode/ures.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 "zoneinfo"
#define kREGIONS "Regions"
#define kZONES "Zones"
#define kRULES "Rules"
#define kNAMES "Names"
#define kDEFAULT "Default"
#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 GMT_ID[] = {0x47, 0x4D, 0x54, 0x00}; /* "GMT" */
static const UChar Z_STR[] = {0x7A, 0x00}; /* "z" */
static const UChar ZZZZ_STR[] = {0x7A, 0x7A, 0x7A, 0x7A, 0x00}; /* "zzzz" */
static const UChar Z_UC_STR[] = {0x5A, 0x00}; /* "Z" */
static const UChar ZZZZ_UC_STR[] = {0x5A, 0x5A, 0x5A, 0x5A, 0x00}; /* "ZZZZ" */
static const UChar V_STR[] = {0x76, 0x00}; /* "v" */
static const UChar VVVV_STR[] = {0x76, 0x76, 0x76, 0x76, 0x00}; /* "vvvv" */
static const UChar V_UC_STR[] = {0x56, 0x00}; /* "V" */
static const UChar VVVV_UC_STR[] = {0x56, 0x56, 0x56, 0x56, 0x00}; /* "VVVV" */
static const int32_t GMT_ID_LENGTH = 3;
static UMTX LOCK;
static UMTX TZSET_LOCK;
static U_NAMESPACE_QUALIFIER TimeZone* DEFAULT_ZONE = NULL;
static U_NAMESPACE_QUALIFIER TimeZone* _GMT = NULL; // cf. TimeZone::GMT
static char TZDATA_VERSION[16];
static UBool TZDataVersionInitialized = FALSE;
#ifdef U_USE_TIMEZONE_OBSOLETE_2_8
static U_NAMESPACE_QUALIFIER UnicodeString* OLSON_IDS = 0;
#endif
U_CDECL_BEGIN
static UBool U_CALLCONV timeZone_cleanup(void)
{
#ifdef U_USE_TIMEZONE_OBSOLETE_2_8
delete []OLSON_IDS;
OLSON_IDS = 0;
#endif
delete DEFAULT_ZONE;
DEFAULT_ZONE = NULL;
delete _GMT;
_GMT = NULL;
uprv_memset(TZDATA_VERSION, 0, sizeof(TZDATA_VERSION));
TZDataVersionInitialized = FALSE;
if (LOCK) {
umtx_destroy(&LOCK);
LOCK = NULL;
}
if (TZSET_LOCK) {
umtx_destroy(&TZSET_LOCK);
TZSET_LOCK = NULL;
}
return TRUE;
}
U_CDECL_END
U_NAMESPACE_BEGIN
/**
* The Olson data is stored the "zoneinfo" resource bundle.
* Sub-resources are organized into three ranges of data: Zones, final
* rules, and country tables. There is also a meta-data resource
* which has 3 integers: The number of zones, rules, and countries,
* respectively. The country count includes the non-country 'Default'.
*/
static int32_t OLSON_ZONE_COUNT = 0; // count of zones
/**
* Given a pointer to an open "zoneinfo" resource, load up the Olson
* meta-data. Return TRUE if successful.
*/
static UBool getOlsonMeta(const UResourceBundle* top) {
if (OLSON_ZONE_COUNT == 0) {
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle res;
ures_initStackObject(&res);
ures_getByKey(top, kZONES, &res, &ec);
if(U_SUCCESS(ec)) {
OLSON_ZONE_COUNT = ures_getSize(&res);
U_DEBUG_TZ_MSG(("OZC%d\n",OLSON_ZONE_COUNT));
}
ures_close(&res);
}
return (OLSON_ZONE_COUNT > 0);
}
/**
* Load up the Olson meta-data. Return TRUE if successful.
*/
static UBool getOlsonMeta() {
if (OLSON_ZONE_COUNT == 0) {
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
if (U_SUCCESS(ec)) {
getOlsonMeta(top);
}
ures_close(top);
}
return (OLSON_ZONE_COUNT > 0);
}
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_getSize(&res) <= 1 && getOlsonMeta(top)) {
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;
}
#ifdef U_USE_TIMEZONE_OBSOLETE_2_8
/**
* Load all the ids from the "zoneinfo" resource bundle into a static
* array that we hang onto. This is _only_ used to implement the
* deprecated createAvailableIDs() API.
*/
static UBool loadOlsonIDs() {
if (OLSON_IDS != 0) {
return TRUE;
}
UErrorCode ec = U_ZERO_ERROR;
UnicodeString* ids = 0;
int32_t count = 0;
UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
UResourceBundle *nres = ures_getByKey(top, kNAMES, NULL, &ec); // dereference Names section
if (U_SUCCESS(ec)) {
getOlsonMeta(top);
int32_t start = 0;
count = ures_getSize(nres);
ids = new UnicodeString[(count > 0) ? count : 1];
// Null pointer check
if (ids != NULL) {
for (int32_t i=0; i<count; ++i) {
int32_t idLen = 0;
const UChar* id = ures_getStringByIndex(nres, i, &idLen, &ec);
ids[i].fastCopyFrom(UnicodeString(TRUE, id, idLen));
if (U_FAILURE(ec)) {
break;
}
}
} else {
ec = U_MEMORY_ALLOCATION_ERROR;
}
}
ures_close(nres);
ures_close(top);
if (U_FAILURE(ec)) {
delete[] ids;
return FALSE;
}
// Keep mutexed operations as short as possible by doing all
// computations first, then doing pointer copies within the mutex.
umtx_lock(&LOCK);
if (OLSON_IDS == 0) {
OLSON_IDS = ids;
ids = 0;
ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
}
umtx_unlock(&LOCK);
// If another thread initialized the statics first, then delete
// our unused data.
delete[] ids;
return TRUE;
}
#endif
// -------------------------------------
const TimeZone* U_EXPORT2
TimeZone::getGMT(void)
{
UBool needsInit;
UMTX_CHECK(&LOCK, (_GMT == NULL), needsInit); /* This is here to prevent race conditions. */
// Initialize _GMT independently of other static data; it should
// be valid even if we can't load the time zone UDataMemory.
if (needsInit) {
SimpleTimeZone *tmpGMT = new SimpleTimeZone(0, UnicodeString(TRUE, GMT_ID, GMT_ID_LENGTH));
umtx_lock(&LOCK);
if (_GMT == 0) {
_GMT = tmpGMT;
tmpGMT = NULL;
}
umtx_unlock(&LOCK);
ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
delete tmpGMT;
}
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 getDynamicClassID() == that.getDynamicClassID() &&
fID == that.fID;
}
// -------------------------------------
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 == 0) {
U_DEBUG_TZ_MSG(("failed to load system time zone with id - falling to custom"));
result = createCustomTimeZone(ID);
}
if (result == 0) {
U_DEBUG_TZ_MSG(("failed to load time zone with id - falling to GMT"));
const TimeZone* temptz = getGMT();
if (temptz == NULL) {
result = NULL;
} else {
result = temptz->clone();
}
}
return result;
}
/**
* 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*
TimeZone::createSystemTimeZone(const UnicodeString& id) {
TimeZone* z = 0;
UErrorCode ec = U_ZERO_ERROR;
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, ec);
if (z) {
z->setID(id);
} else {
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;
}
// -------------------------------------
/**
* Initialize DEFAULT_ZONE from the system default time zone. The
* caller should confirm that DEFAULT_ZONE is NULL before calling.
* Upon return, DEFAULT_ZONE will not be NULL, unless operator new()
* returns NULL.
*
* Must be called OUTSIDE mutex.
*/
void
TimeZone::initDefault()
{
// 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].
{
// NOTE: Local mutex here. TimeZone mutex below
// mutexed to avoid threading issues in the platform functions.
// Some of the locale/timezone OS functions may not be thread safe,
// so the intent is that any setting from anywhere within ICU
// happens while the ICU mutex is held.
// The operating system might actually use ICU to implement timezones.
// So we may have ICU calling ICU here, like on AIX.
// In order to prevent a double lock of a non-reentrant mutex in a
// different part of ICU, we use TZSET_LOCK to allow only one instance
// of ICU to query these thread unsafe OS functions at any given time.
Mutex lock(&TZSET_LOCK);
ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
uprv_tzset(); // Initialize tz... system data
// 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;
}
UBool initialized;
UMTX_CHECK(&LOCK, (DEFAULT_ZONE != NULL), initialized);
if (initialized) {
/* Hrmph? Either a race condition happened, or tzset initialized ICU. */
return;
}
TimeZone* default_zone = 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);
default_zone = createSystemTimeZone(hostStrID);
#ifdef U_WINDOWS
// hostID points to a heap-allocated location on Windows.
uprv_free(const_cast<char *>(hostID));
#endif
int32_t hostIDLen = hostStrID.length();
if (default_zone != NULL && rawOffset != default_zone->getRawOffset()
&& (3 <= hostIDLen && hostIDLen <= 4))
{
// Uh oh. This probably wasn't a good id.
// It was probably an ambiguous abbreviation
delete default_zone;
default_zone = NULL;
}
// Construct a fixed standard zone with the host's ID
// and raw offset.
if (default_zone == NULL) {
default_zone = new SimpleTimeZone(rawOffset, hostStrID);
}
// If we _still_ don't have a time zone, use GMT.
if (default_zone == NULL) {
const TimeZone* temptz = getGMT();
// If we can't use GMT, get out.
if (temptz == NULL) {
return;
}
default_zone = temptz->clone();
}
// If DEFAULT_ZONE is still NULL, set it up.
umtx_lock(&LOCK);
if (DEFAULT_ZONE == NULL) {
DEFAULT_ZONE = default_zone;
default_zone = NULL;
ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
}
umtx_unlock(&LOCK);
delete default_zone;
}
// -------------------------------------
TimeZone* U_EXPORT2
TimeZone::createDefault()
{
/* This is here to prevent race conditions. */
UBool needsInit;
UMTX_CHECK(&LOCK, (DEFAULT_ZONE == NULL), needsInit);
if (needsInit) {
initDefault();
}
Mutex lock(&LOCK); // In case adoptDefault is called
return (DEFAULT_ZONE != NULL) ? DEFAULT_ZONE->clone() : NULL;
}
// -------------------------------------
void U_EXPORT2
TimeZone::adoptDefault(TimeZone* zone)
{
if (zone != NULL)
{
TimeZone* old = NULL;
umtx_lock(&LOCK);
old = DEFAULT_ZONE;
DEFAULT_ZONE = zone;
umtx_unlock(&LOCK);
delete old;
ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
}
}
// -------------------------------------
void U_EXPORT2
TimeZone::setDefault(const TimeZone& zone)
{
adoptDefault(zone.clone());
}
//----------------------------------------------------------------------
/**
* 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
// iff the zone data could not be loaded.
int32_t* map;
int32_t len;
int32_t pos;
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);
}
public:
TZEnumeration() : map(NULL), len(0), pos(0) {
if (getOlsonMeta()) {
len = OLSON_ZONE_COUNT;
}
}
TZEnumeration(int32_t rawOffset) : map(NULL), len(0), pos(0) {
if (!getOlsonMeta()) {
return;
}
// Allocate more space than we'll need. The end of the array will
// be blank.
map = (int32_t*)uprv_malloc(OLSON_ZONE_COUNT * sizeof(int32_t));
if (map == 0) {
return;
}
uprv_memset(map, 0, sizeof(int32_t) * OLSON_ZONE_COUNT);
UnicodeString s;
for (int32_t i=0; i<OLSON_ZONE_COUNT; ++i) {
if (getID(i)) {
// This is VERY inefficient.
TimeZone* z = TimeZone::createTimeZone(unistr);
// Make sure we get back the ID we wanted (if the ID is
// invalid we get back GMT).
if (z != 0 && z->getID(s) == unistr &&
z->getRawOffset() == rawOffset) {
map[len++] = i;
}
delete z;
}
}
}
TZEnumeration(const char* country) : map(NULL), len(0), pos(0) {
if (!getOlsonMeta()) {
return;
}
char key[] = {0, 0, 0, 0,0, 0, 0,0, 0, 0,0}; // e.g., "US", or "Default" for no country
if (country) {
uprv_strncat(key, country, 2);
} else {
uprv_strcpy(key, kDEFAULT);
}
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
top = ures_getByKey(top, kREGIONS, top, &ec); // dereference 'Regions' section
if (U_SUCCESS(ec)) {
UResourceBundle res;
ures_initStackObject(&res);
ures_getByKey(top, key, &res, &ec);
// The list of zones is a list of integers, from 0..n-1,
// where n is the total number of system zones.
const int32_t* v = ures_getIntVector(&res, &len, &ec);
if (U_SUCCESS(ec)) {
U_ASSERT(len > 0);
map = (int32_t*)uprv_malloc(sizeof(int32_t) * len);
if (map != 0) {
for (uint16_t i=0; i<len; ++i) {
U_ASSERT(v[i] >= 0 && v[i] < OLSON_ZONE_COUNT);
map[i] = v[i];
}
}
} else {
U_DEBUG_TZ_MSG(("Failed to load tz for region %s: %s\n", country, u_errorName(ec)));
}
ures_close(&res);
}
ures_close(top);
}
TZEnumeration(const TZEnumeration &other) : StringEnumeration(), map(NULL), len(0), pos(0) {
if(other.len > 0) {
if(other.map != NULL) {
map = (int32_t *)uprv_malloc(other.len * sizeof(int32_t));
if(map != NULL) {
len = other.len;
uprv_memcpy(map, other.map, len * sizeof(int32_t));
pos = other.pos;
}
} else {
len = other.len;
pos = other.pos;
}
}
}
virtual ~TZEnumeration() {
uprv_free(map);
}
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) && pos < len) {
getID((map == 0) ? pos : 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;
};
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TZEnumeration)
StringEnumeration* U_EXPORT2
TimeZone::createEnumeration() {
return new TZEnumeration();
}
StringEnumeration* U_EXPORT2
TimeZone::createEnumeration(int32_t rawOffset) {
return new TZEnumeration(rawOffset);
}
StringEnumeration* U_EXPORT2
TimeZone::createEnumeration(const char* country) {
return new TZEnumeration(country);
}
// -------------------------------------
#ifdef U_USE_TIMEZONE_OBSOLETE_2_8
const UnicodeString**
TimeZone::createAvailableIDs(int32_t rawOffset, int32_t& numIDs)
{
// We are creating a new array to existing UnicodeString pointers.
// The caller will delete the array when done, but not the pointers
// in the array.
numIDs = 0;
if (!loadOlsonIDs()) {
return 0;
}
// Allocate more space than we'll need. The end of the array will
// be blank.
const UnicodeString** ids =
(const UnicodeString** )uprv_malloc(OLSON_ZONE_COUNT * sizeof(UnicodeString *));
if (ids == 0) {
return 0;
}
uprv_memset(ids, 0, sizeof(UnicodeString*) * OLSON_ZONE_COUNT);
UnicodeString s;
for (int32_t i=0; i<OLSON_ZONE_COUNT; ++i) {
// This is VERY inefficient.
TimeZone* z = TimeZone::createTimeZone(OLSON_IDS[i]);
// Make sure we get back the ID we wanted (if the ID is
// invalid we get back GMT).
if (z != 0 && z->getID(s) == OLSON_IDS[i] &&
z->getRawOffset() == rawOffset) {
ids[numIDs++] = &OLSON_IDS[i]; // [sic]
}
delete z;
}
return ids;
}
// -------------------------------------
const UnicodeString**
TimeZone::createAvailableIDs(const char* country, int32_t& numIDs) {
// We are creating a new array to existing UnicodeString pointers.
// The caller will delete the array when done, but not the pointers
// in the array.
numIDs = 0;
if (!loadOlsonIDs()) {
return 0;
}
char key[] = { 0, 0, 0,0, 0, 0,0, 0, 0 }; // e.g., "US", or "Default" for non-country zones
if (country) {
uprv_strncat(key, country, 2);
} else {
uprv_strcpy(key, kDEFAULT);
}
const UnicodeString** ids = 0;
UErrorCode ec = U_ZERO_ERROR;
UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
UResourceBundle *ares = ures_getByKey(top, kREGIONS, NULL, &ec); // dereference Regions section
if (U_SUCCESS(ec)) {
getOlsonMeta(top);
UResourceBundle res;
ures_initStackObject(&res);
ures_getByKey(ares, key, &res, &ec);
U_DEBUG_TZ_MSG(("caI: on %s, err %s\n", country, u_errorName(ec)));
if (U_SUCCESS(ec)) {
/* The list of zones is a list of integers, from 0..n-1,
* where n is the total number of system zones. The
* numbering corresponds exactly to the ordering of
* OLSON_IDS.
*/
const int32_t* v = ures_getIntVector(&res, &numIDs, &ec);
ids = (const UnicodeString**)
uprv_malloc(numIDs * sizeof(UnicodeString*));
if (ids == 0) {
numIDs = 0;
} else {
for (int32_t i=0; i<numIDs; ++i) {
ids[i] = &OLSON_IDS[v[i]]; // [sic]
}
}
}
ures_close(&res);
}
ures_close(ares);
ures_close(top);
return ids;
}
// -------------------------------------
const UnicodeString**
TimeZone::createAvailableIDs(int32_t& numIDs)
{
// We are creating a new array to existing UnicodeString pointers.
// The caller will delete the array when done, but not the pointers
// in the array.
numIDs = 0;
if (!loadOlsonIDs()) {
return 0;
}
const UnicodeString** ids =
(const UnicodeString** )uprv_malloc(OLSON_ZONE_COUNT * sizeof(UnicodeString *));
if (ids != 0) {
numIDs = OLSON_ZONE_COUNT;
for (int32_t i=0; i<numIDs; ++i) {
ids[i] = &OLSON_IDS[i];
}
}
return ids;
}
#endif
// ---------------------------------------
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)) {
int32_t size = ures_getSize(&res);
U_DEBUG_TZ_MSG(("cEI: success (size %d, key %s)..\n", size, ures_getKey(&res)));
if (size == 4 || size == 6) {
UResourceBundle r;
ures_initStackObject(&r);
ures_getByIndex(&res, size-1, &r, &ec);
//result = ures_getSize(&r); // doesn't work
ures_getIntVector(&r, &result, &ec);
U_DEBUG_TZ_MSG(("ceI: result %d, err %s\n", result, u_errorName(ec)));
ures_close(&r);
}
} else {
U_DEBUG_TZ_MSG(("cEI: fail, %s\n", u_errorName(ec)));
}
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)) {
int32_t size = ures_getSize(&res);
if (size == 4 || size == 6) {
UResourceBundle r;
ures_initStackObject(&r);
ures_getByIndex(&res, size-1, &r, &ec);
const int32_t* v = ures_getIntVector(&r, &size, &ec);
if (index >= 0 && index < size && getOlsonMeta()) {
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;
}
// ---------------------------------------
UnicodeString&
TimeZone::dereferOlsonLink(const UnicodeString& linkTo, UnicodeString& linkFrom) {
UErrorCode ec = U_ZERO_ERROR;
linkFrom.remove();
UResourceBundle *top = ures_openDirect(0, kZONEINFO, &ec);
UResourceBundle *res = getZoneByName(top, linkTo, NULL, ec);
if (U_SUCCESS(ec)) {
if (ures_getSize(res) == 1) {
int32_t deref = ures_getInt(res, &ec);
UResourceBundle *nres = ures_getByKey(top, kNAMES, NULL, &ec); // dereference Names section
int32_t len;
const UChar* tmp = ures_getStringByIndex(nres, deref, &len, &ec);
if (U_SUCCESS(ec)) {
linkFrom.setTo(tmp, len);
}
ures_close(nres);
} else {
linkFrom.setTo(linkTo);
}
}
ures_close(res);
ures_close(top);
return linkFrom;
}
// ---------------------------------------
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
{
// SRL TODO: cache the SDF, just like java.
UErrorCode status = U_ZERO_ERROR;
#ifdef U_DEBUG_TZ
char buf[128];
fID.extract(0, sizeof(buf)-1, buf, sizeof(buf), "");
#endif
// select the proper format string
UnicodeString pat;
switch(style){
case LONG:
pat = ZZZZ_STR;
break;
case SHORT_GENERIC:
pat = V_STR;
break;
case LONG_GENERIC:
pat = VVVV_STR;
break;
case SHORT_GMT:
pat = Z_UC_STR;
break;
case LONG_GMT:
pat = ZZZZ_UC_STR;
break;
case SHORT_COMMONLY_USED:
pat = V_UC_STR;
break;
case GENERIC_LOCATION:
pat = VVVV_UC_STR;
break;
default: // SHORT
pat = Z_STR;
break;
}
SimpleDateFormat format(pat, locale, status);
U_DEBUG_TZ_MSG(("getDisplayName(%s)\n", buf));
if(!U_SUCCESS(status))
{
#ifdef U_DEBUG_TZ
char buf2[128];
result.extract(0, sizeof(buf2)-1, buf2, sizeof(buf2), "");
U_DEBUG_TZ_MSG(("getDisplayName(%s) -> %s\n", buf, buf2));
#endif
return result.remove();
}
UDate d = Calendar::getNow();
int32_t rawOffset;
int32_t dstOffset;
this->getOffset(d, FALSE, rawOffset, dstOffset, status);
if (U_FAILURE(status)) {
return result.remove();
}
if ((daylight && dstOffset != 0) ||
(!daylight && dstOffset == 0) ||
(style == SHORT_GENERIC) ||
(style == LONG_GENERIC)
) {
// Current time and the request (daylight / not daylight) agree.
format.setTimeZone(*this);
return format.format(d, result);
}
// Create a new SimpleTimeZone as a stand-in for this zone; the
// stand-in will have no DST, or DST during July, but the same ID and offset,
// and hence the same display name.
// We don't cache these because they're small and cheap to create.
UnicodeString tempID;
getID(tempID);
SimpleTimeZone *tz = NULL;
if(daylight && useDaylightTime()){
// The display name for daylight saving time was requested, but currently not in DST
// Set a fixed date (July 1) in this Gregorian year
GregorianCalendar cal(*this, status);
if (U_FAILURE(status)) {
return result.remove();
}
cal.set(UCAL_MONTH, UCAL_JULY);
cal.set(UCAL_DATE, 1);
// Get July 1 date
d = cal.getTime(status);
// Check if it is in DST
if (cal.get(UCAL_DST_OFFSET, status) == 0) {
// We need to create a fake time zone
tz = new SimpleTimeZone(rawOffset, tempID,
UCAL_JUNE, 1, 0, 0,
UCAL_AUGUST, 1, 0, 0,
getDSTSavings(), status);
if (U_FAILURE(status) || tz == NULL) {
if (U_SUCCESS(status)) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return result.remove();
}
format.adoptTimeZone(tz);
} else {
format.setTimeZone(*this);
}
} else {
// The display name for standard time was requested, but currently in DST
// or display name for daylight saving time was requested, but this zone no longer
// observes DST.
tz = new SimpleTimeZone(rawOffset, tempID);
if (U_FAILURE(status) || tz == NULL) {
if (U_SUCCESS(status)) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return result.remove();
}
format.adoptTimeZone(tz);
}
format.format(d, result, status);
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);
}
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))
{
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);
// 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);
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());
}
const char*
TimeZone::getTZDataVersion(UErrorCode& status)
{
/* This is here to prevent race conditions. */
UBool needsInit;
UMTX_CHECK(&LOCK, !TZDataVersionInitialized, needsInit);
if (needsInit) {
int32_t len = 0;
UResourceBundle *bundle = ures_openDirect(NULL, "zoneinfo", &status);
const UChar *tzver = ures_getStringByKey(bundle, "TZVersion",
&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;
}
umtx_lock(&LOCK);
if (!TZDataVersionInitialized) {
u_UCharsToChars(tzver, TZDATA_VERSION, len);
TZDataVersionInitialized = TRUE;
}
umtx_unlock(&LOCK);
ucln_i18n_registerCleanup(UCLN_I18N_TIMEZONE, timeZone_cleanup);
}
ures_close(bundle);
}
if (U_FAILURE(status)) {
return NULL;
}
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;
}
ZoneMeta::getCanonicalSystemID(id, canonicalID, status);
if (U_SUCCESS(status)) {
isSystemID = TRUE;
} else {
// Not a system ID
status = U_ZERO_ERROR;
getCustomID(id, canonicalID, status);
}
return canonicalID;
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
//eof