/usr/share/php/Horde/ActiveSync/Timezone.php is in php-horde-activesync 2.19.2-2.
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/**
* Horde_ActiveSync_Timezone::
*
* @license http://www.horde.org/licenses/gpl GPLv2
* NOTE: According to sec. 8 of the GENERAL PUBLIC LICENSE (GPL),
* Version 2, the distribution of the Horde_ActiveSync module in or
* to the United States of America is excluded from the scope of this
* license.
* @copyright 2009-2014 Horde LLC (http://www.horde.org)
* @author Michael J Rubinsky <mrubinsk@horde.org>
* @package ActiveSync
*/
/**
* Utility functions for dealing with Microsoft ActiveSync's Timezone format.
*
* Copyright 2009-2014 Horde LLC (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* Code dealing with searching for a timezone identifier from an AS timezone
* blob inspired by code in the Tine20 Project (http://tine20.org).
*
* @license http://www.horde.org/licenses/gpl GPLv2
* NOTE: According to sec. 8 of the GENERAL PUBLIC LICENSE (GPL),
* Version 2, the distribution of the Horde_ActiveSync module in or
* to the United States of America is excluded from the scope of this
* license.
* @copyright 2009-2014 Horde LLC (http://www.horde.org)
* @author Michael J Rubinsky <mrubinsk@horde.org>
* @package ActiveSync
* @deprecated To be removed for Horde 6. Use Horde_Mapi_Timezone::.
*/
class Horde_ActiveSync_Timezone
{
/**
* Date to use as start date when iterating through offsets looking for a
* transition.
*
* @var Horde_Date
*/
protected $_startDate;
/**
* Convert a timezone from the ActiveSync base64 structure to a TZ offset
* hash.
*
* @param base64 encoded timezone structure defined by MS as:
* <pre>
* typedef struct TIME_ZONE_INFORMATION {
* LONG Bias;
* WCHAR StandardName[32];
* SYSTEMTIME StandardDate;
* LONG StandardBias;
* WCHAR DaylightName[32];
* SYSTEMTIME DaylightDate;
* LONG DaylightBias;};
* </pre>
*
* With the SYSTEMTIME format being:
* <pre>
* typedef struct _SYSTEMTIME {
* WORD wYear;
* WORD wMonth;
* WORD wDayOfWeek;
* WORD wDay;
* WORD wHour;
* WORD wMinute;
* WORD wSecond;
* WORD wMilliseconds;
* } SYSTEMTIME, *PSYSTEMTIME;
* </pre>
*
* See: http://msdn.microsoft.com/en-us/library/ms724950%28VS.85%29.aspx
* and: http://msdn.microsoft.com/en-us/library/ms725481%28VS.85%29.aspx
*
* @return array Hash of offset information
*/
static public function getOffsetsFromSyncTZ($data)
{
if (PHP_MINOR_VERSION >= 5) {
$format = 'lbias/Z64stdname/vstdyear/vstdmonth/vstdday/vstdweek/vstdhour/vstdminute/vstdsecond/vstdmillis/'
. 'lstdbias/Z64dstname/vdstyear/vdstmonth/vdstday/vdstweek/vdsthour/vdstminute/vdstsecond/vdstmillis/'
. 'ldstbias';
} else {
$format = 'lbias/a64stdname/vstdyear/vstdmonth/vstdday/vstdweek/vstdhour/vstdminute/vstdsecond/vstdmillis/'
. 'lstdbias/a64dstname/vdstyear/vdstmonth/vdstday/vdstweek/vdsthour/vdstminute/vdstsecond/vdstmillis/'
. 'ldstbias';
}
$tz = unpack($format, base64_decode($data));
$tz['timezone'] = $tz['bias'];
$tz['timezonedst'] = $tz['dstbias'];
if (!self::_isLittleEndian()) {
$tz['bias'] = self::_chbo($tz['bias']);
$tz['stdbias'] = self::_chbo($tz['stdbias']);
$tz['dstbias'] = self::_chbo($tz['dstbias']);
}
return $tz;
}
/**
* Build an ActiveSync TZ blob given a TZ Offset hash.
*
* @param array $offsets A TZ offset hash
*
* @return string A base64_encoded ActiveSync Timezone structure suitable
* for transmitting via wbxml.
*/
static public function getSyncTZFromOffsets(array $offsets)
{
if (!self::_isLittleEndian()) {
$offsets['bias'] = self::_chbo($offsets['bias']);
$offsets['stdbias'] = self::_chbo($offsets['stdbias']);
$offsets['dstbias'] = self::_chbo($offsets['dstbias']);
}
$packed = pack('la64vvvvvvvvla64vvvvvvvvl',
$offsets['bias'], '', 0, $offsets['stdmonth'], $offsets['stdday'], $offsets['stdweek'], $offsets['stdhour'], $offsets['stdminute'], $offsets['stdsecond'], $offsets['stdmillis'],
$offsets['stdbias'], '', 0, $offsets['dstmonth'], $offsets['dstday'], $offsets['dstweek'], $offsets['dsthour'], $offsets['dstminute'], $offsets['dstsecond'], $offsets['dstmillis'],
$offsets['dstbias']);
return base64_encode($packed);
}
/**
* Create a offset hash suitable for use in ActiveSync transactions
*
* @param Horde_Date $date A date object representing the date to base the
* the tz data on.
*
* @return array An offset hash.
*/
static public function getOffsetsFromDate(Horde_Date $date)
{
$offsets = array(
'bias' => 0,
'stdname' => '',
'stdyear' => 0,
'stdmonth' => 0,
'stdday' => 0,
'stdweek' => 0,
'stdhour' => 0,
'stdminute' => 0,
'stdsecond' => 0,
'stdmillis' => 0,
'stdbias' => 0,
'dstname' => '',
'dstyear' => 0,
'dstmonth' => 0,
'dstday' => 0,
'dstweek' => 0,
'dsthour' => 0,
'dstminute' => 0,
'dstsecond' => 0,
'dstmillis' => 0,
'dstbias' => 0
);
$timezone = $date->toDateTime()->getTimezone();
list($std, $dst) = self::_getTransitions($timezone, $date);
if ($std) {
$offsets['bias'] = $std['offset'] / 60 * -1;
if ($dst) {
$offsets = self::_generateOffsetsForTransition($offsets, $std, 'std');
$offsets = self::_generateOffsetsForTransition($offsets, $dst, 'dst');
$offsets['stdhour'] += $dst['offset'] / 3600;
$offsets['dsthour'] += $std['offset'] / 3600;
$offsets['dstbias'] = ($dst['offset'] - $std['offset']) / 60 * -1;
}
}
return $offsets;
}
/**
* Get the transition data for moving from DST to STD time.
*
* @param DateTimeZone $timezone The timezone to get the transition for
* @param Horde_Date $date The date to start from. Really only the
* year we are interested in is needed.
*
* @return array An array containing the the STD and DST transitions
*/
static protected function _getTransitions(DateTimeZone $timezone, Horde_Date $date)
{
$std = $dst = array();
$transitions = $timezone->getTransitions(
mktime(0, 0, 0, 12, 1, $date->year - 1),
mktime(24, 0, 0, 12, 31, $date->year)
);
foreach ($transitions as $i => $transition) {
try {
$d = new Horde_Date($transition['time']);
$d->setTimezone('UTC');
} catch (Exception $e) {
continue;
}
if (($d->format('Y') == $date->format('Y')) && isset($transitions[$i + 1])) {
$next = new Horde_Date($transitions[$i + 1]['ts']);
if ($d->format('Y') == $next->format('Y')) {
$dst = $transition['isdst'] ? $transition : $transitions[$i + 1];
$std = $transition['isdst'] ? $transitions[$i + 1] : $transition;
} else {
$dst = $transition['isdst'] ? $transition: null;
$std = $transition['isdst'] ? null : $transition;
}
break;
} elseif ($i == count($transitions) - 1) {
$std = $transition;
}
}
return array($std, $dst);
}
/**
* Calculate the offsets for the specified transition
*
* @param array $offsets A TZ offset hash
* @param array $transition A transition hash
* @param string $type Transition type - dst or std
*
* @return array A populated offset hash
*/
static protected function _generateOffsetsForTransition(array $offsets, array $transition, $type)
{
// We can't use Horde_Date directly here, since it is unable to
// properly convert to UTC from local ON the exact hour of a std -> dst
// transition. This is due to a conversion to DateTime in the localtime
// zone internally before the timezone change is applied
$transitionDate = new DateTime($transition['time']);
$transitionDate->setTimezone(new DateTimeZone('UTC'));
$transitionDate = new Horde_Date($transitionDate);
$offsets[$type . 'month'] = $transitionDate->format('n');
$offsets[$type . 'day'] = $transitionDate->format('w');
$offsets[$type . 'minute'] = (int)$transitionDate->format('i');
$offsets[$type . 'hour'] = (int)$transitionDate->format('H');
for ($i = 5; $i > 0; $i--) {
if (self::_isNthOcurrenceOfWeekdayInMonth($transition['ts'], $i)) {
$offsets[$type . 'week'] = $i;
break;
}
}
return $offsets;
}
/**
* Attempt to guess the timezone identifier from the $offsets array.
*
* @param array|string $offsets The timezone to check. Either an array
* of offsets or an activesynz tz blob.
* @param string $expectedTimezone The expected timezone. If not empty, and
* present in the results, will return.
*
* @return string The timezone identifier
*/
public function getTimezone($offsets, $expectedTimezone = null)
{
$timezones = $this->getListOfTimezones($offsets, $expectedTimezone);
if (isset($timezones[$expectedTimezone])) {
return $expectedTimezone;
} else {
return current($timezones);
}
}
/**
* Get the list of timezone identifiers that match the given offsets, having
* a preference for $expectedTimezone if it's present in the results.
*
* @param array|string $offsets Either an offset array, or a AS timezone
* structure.
* @param string $expectedTimezone The expected timezone.
*
* @return array An array of timezone identifiers
*/
public function getListOfTimezones($offsets, $expectedTimezone = null)
{
if (is_string($offsets)) {
$offsets = self::getOffsetsFromSyncTZ($offsets);
}
$this->_setDefaultStartDate($offsets);
$timezones = array();
foreach (DateTimeZone::listIdentifiers() as $timezoneIdentifier) {
$timezone = new DateTimeZone($timezoneIdentifier);
if (false !== ($matchingTransition = $this->_checkTimezone($timezone, $offsets))) {
if ($timezoneIdentifier == $expectedTimezone) {
$timezones = array($timezoneIdentifier => $matchingTransition['abbr']);
break;
} else {
$timezones[$timezoneIdentifier] = $matchingTransition['abbr'];
}
}
}
if (empty($timezones)) {
throw new Horde_ActiveSync_Exception('No timezone found for the given offsets');
}
return $timezones;
}
/**
* Set default value for $_startDate.
*
* Tries to guess the correct startDate depending on object property falls
* back to current date.
*
* @param array $offsets Offsets may be avaluated for a given start year
*/
protected function _setDefaultStartDate(array $offsets = null)
{
if (!empty($this->_startDate)) {
return;
}
if (!empty($offsets['stdyear'])) {
$this->_startDate = new Horde_Date($offsets['stdyear'] . '-01-01');
} else {
$start = new Horde_Date(time());
$start->year--;
$this->_startDate = $start;
}
}
/**
* Check if the given timezone matches the offsets and also evaluate the
* daylight saving time transitions for this timezone if necessary.
*
* @param DateTimeZone $timezone The timezone to check.
* @param array $offsets The offsets to check.
*
* @return array|boolean An array of transition data or false if timezone
* does not match offset.
*/
protected function _checkTimezone(DateTimeZone $timezone, array $offsets)
{
list($std, $dst) = $this->_getTransitions($timezone, $this->_startDate);
if ($this->_checkTransition($std, $dst, $offsets)) {
return $std;
}
return false;
}
/**
* Check if the given standardTransition and daylightTransition match to the
* given offsets.
*
* @param array $std The Standard transition date.
* @param array $dst The DST transition date.
* @param array $offsets The offsets to check.
*
* @return boolean
*/
protected function _checkTransition(array $std, array $dst, array $offsets)
{
if (empty($std) || empty($offsets)) {
return false;
}
$standardOffset = ($offsets['bias'] + $offsets['stdbias']) * 60 * -1;
// check each condition in a single if statement and break the chain
// when one condition is not met - for performance reasons
if ($standardOffset == $std['offset']) {
if ((empty($offsets['dstmonth']) && (empty($dst) || empty($dst['isdst']))) ||
(empty($dst) && !empty($offsets['dstmonth']))) {
// Offset contains DST, but no dst to compare
return true;
}
$daylightOffset = ($offsets['bias'] + $offsets['dstbias']) * 60 * -1;
// the milestone is sending a positive value for daylightBias while it should send a negative value
$daylightOffsetMilestone = ($offsets['dstbias'] + ($offsets['dstbias'] * -1) ) * 60 * -1;
if ($daylightOffset == $dst['offset'] || $daylightOffsetMilestone == $dst['offset']) {
$standardParsed = new DateTime($std['time']);
$daylightParsed = new DateTime($dst['time']);
if ($standardParsed->format('n') == $offsets['stdmonth'] &&
$daylightParsed->format('n') == $offsets['dstmonth'] &&
$standardParsed->format('w') == $offsets['stdday'] &&
$daylightParsed->format('w') == $offsets['dstday'])
{
return self::_isNthOcurrenceOfWeekdayInMonth($dst['ts'], $offsets['dstweek']) &&
self::_isNthOcurrenceOfWeekdayInMonth($std['ts'], $offsets['stdweek']);
}
}
}
return false;
}
/**
* Test if the weekday of the given timestamp is the nth occurence of this
* weekday within its month, where '5' indicates the last occurrence even if
* there is less than five occurrences.
*
* @param integer $timestamp The timestamp to check.
* @param integer $occurence 1 to 5, where 5 indicates the final occurrence
* during the month if that day of the week does
* not occur 5 times
* @return boolean
*/
static protected function _isNthOcurrenceOfWeekdayInMonth($timestamp, $occurence)
{
$original = new Horde_Date($timestamp);
$original->setTimezone('UTC');
if ($occurence == 5) {
$modified = $original->add(array('mday' => 7));
return $modified->month > $original->month;
} else {
$modified = $original->sub(array('mday' => 7 * $occurence));
$modified2 = $original->sub(array('mday' => 7 * ($occurence - 1)));
return $modified->month < $original->month &&
$modified2->month == $original->month;
}
}
/**
* Determine if the current machine is little endian.
*
* @return boolean True if endianness is little endian, otherwise false.
*/
static protected function _isLittleEndian() {
$testint = 0x00FF;
$p = pack('S', $testint);
return ($testint === current(unpack('v', $p)));
}
/**
* Change the byte order of a number. Used to allow big endian machines to
* decode the timezone blobs, which are encoded in little endian order.
*
* @param integer $num The number to reverse.
*
* @return integer The number, in the reverse byte order.
*/
static protected function _chbo($num) {
$u = unpack('l', strrev(pack('l', $num)));
return $u[1];
}
}
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