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sogo/OpenChange/iCalTimeZone+MAPIStore.m

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/* iCalTimeZone+MAPIStore.m - this file is part of SOGo
*
* Copyright (C) 2012 Inverse inc
*
* Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#import <Foundation/NSArray.h>
#import <Foundation/NSCalendarDate.h>
#import <Foundation/NSString.h>
#import <Foundation/NSTimeZone.h>
#import <NGCards/iCalByDayMask.h>
#import <NGCards/iCalDateTime.h>
#import <NGCards/iCalTimeZonePeriod.h>
#import <NGCards/iCalRecurrenceRule.h>
#import "NSString+MAPIStore.h"
#import "NSData+MAPIStore.h"
#import "NSDate+MAPIStore.h"
#include <stdbool.h>
#include <stdint.h>
#include <talloc.h>
#undef DEBUG
#include <libmapi/libmapi.h>
#import "iCalTimeZone+MAPIStore.h"
#import "MAPIStoreTypes.h"
@interface iCalTimeZonePeriod (MAPIStorePropertiesPrivate)
- (void) _fillTZDate: (struct SYSTEMTIME *) tzData;
@end
@implementation iCalTimeZonePeriod (MAPIStorePropertiesPrivate)
- (void) _fillTZDate: (struct SYSTEMTIME *) tzData
{
iCalRecurrenceRule *rrule;
NSArray *byMonth;
iCalByDayMask *mask;
NSCalendarDate *dateValue;
int16_t wDay;
rrule = [self recurrenceRule];
byMonth = [rrule byMonth];
if ([byMonth count] > 0)
{
tzData->wMonth = [[byMonth objectAtIndex: 0] intValue];
mask = [rrule byDayMask];
tzData->wDayOfWeek = [mask firstDay];
wDay = [mask firstOccurrence];
if (wDay < 0)
/* [MS-OXOCAL] the wDay field is set to indicate the
occurrence of the day of the week within the month (1 to
5, where 5 indicates the final occurrence during the
month if that day of the week does not occur 5 times). */
wDay += 6;
tzData->wDay = (uint16_t) wDay;
dateValue = [self startDate];
tzData->wHour = [dateValue hourOfDay];
tzData->wMinute = [dateValue minuteOfHour];
tzData->wSecond = [dateValue secondOfMinute];
}
}
@end
@implementation iCalTimeZone (MAPIStoreProperties)
- (iCalTimeZonePeriod *) _mostRecentPeriodWithName: (NSString *) periodName
{
NSArray *periods;
iCalTimeZonePeriod *period;
NSUInteger max;
periods = [self childrenWithTag: periodName];
max = [periods count];
if (max > 0)
{
periods = [periods sortedArrayUsingSelector: @selector (compare:)];
period = (iCalTimeZonePeriod *) [periods objectAtIndex: (max - 1)];
}
else
period = nil;
return period;
}
- (struct Binary_r *) asTimeZoneStructInMemCtx: (TALLOC_CTX *) memCtx
{
iCalTimeZonePeriod *period;
struct TimeZoneStruct tz;
int32_t lBias, dlBias;
memset (&tz, 0, sizeof (struct TimeZoneStruct));
period = [self _mostRecentPeriodWithName: @"STANDARD"];
lBias = -[period secondsOffsetFromGMT] / 60;
tz.lBias = lBias;
[period _fillTZDate: &tz.stStandardDate];
period = [self _mostRecentPeriodWithName: @"DAYLIGHT"];
if (!period)
tz.stStandardDate.wMonth = 0;
dlBias = -([period secondsOffsetFromGMT] / 60) - lBias;
tz.lDaylightBias = dlBias;
[period _fillTZDate: &tz.stDaylightDate];
tz.wStandardYear = tz.stStandardDate.wYear;
tz.wDaylightYear = tz.stDaylightDate.wYear;
return set_TimeZoneStruct (memCtx, &tz);
}
- (struct Binary_r *) asZoneTimeDefinitionWithFlags: (enum TZRuleFlag) flags
inMemCtx: (TALLOC_CTX *) memCtx
{
iCalTimeZonePeriod *period;
struct TimeZoneDefinition definition;
struct TZRule rule;
NSString *tzId;
int lBias, dlBias;
memset (&definition, 0, sizeof (struct TimeZoneDefinition));
definition.major = 0x02;
definition.minor = 0x01;
definition.reserved = 0x0002;
tzId = [self tzId];
definition.keyName = [tzId asUnicodeInMemCtx: memCtx];
definition.cbHeader = 6 + [tzId length] * 2;
definition.cRules = 1;
definition.TZRules = &rule;
memset (&rule, 0, sizeof (struct TZRule));
rule.major = 0x02;
rule.minor = 0x01;
rule.reserved = 0x003e;
rule.flags = flags;
period = [self _mostRecentPeriodWithName: @"STANDARD"];
rule.wYear = [[period startDate] yearOfCommonEra];
lBias = -[period secondsOffsetFromGMT] / 60;
rule.lBias = lBias;
[period _fillTZDate: &rule.stStandardDate];
period = [self _mostRecentPeriodWithName: @"DAYLIGHT"];
if (!period)
rule.stStandardDate.wMonth = 0;
dlBias = -([period secondsOffsetFromGMT] / 60) - lBias;
rule.lDaylightBias = dlBias;
[period _fillTZDate: &rule.stDaylightDate];
return set_TimeZoneDefinition (memCtx, &definition);
}
- (NSString *) _offsetStringFromOffset: (NSInteger) offset
{
NSInteger offsetHours, offsetMins;
NSString *offsetSign;
/* The offset format is, eg, "+0200" for 2 hours 0 minutes ahead */
if (offset < 0)
offsetSign = @"-";
else
offsetSign = @"+";
offsetHours = abs (offset) / 60;
offsetMins = abs (offset) % 60;
return [NSString stringWithFormat: @"%@%d%d%d%d",
offsetSign, offsetHours / 10, offsetHours % 10,
offsetMins / 10, offsetMins % 10];
}
- (NSString *) _rRuleStringFromSystemTime: (struct SYSTEMTIME) date
{
NSString *result, *byDay;
/* The conversion tables between the SYSTEMTIME fields and the RRULE ones
can be found at [MS-OXCICAL] 2.1.3.2.1 */
if (date.wDay == 5)
byDay = @"-1";
else
byDay = [NSString stringWithFormat: @"%d", date.wDay];
switch (date.wDayOfWeek)
{
case iCalWeekDaySunday:
byDay = [byDay stringByAppendingString: @"SU"];
break;
case iCalWeekDayMonday:
byDay = [byDay stringByAppendingString: @"MO"];
break;
case iCalWeekDayTuesday:
byDay = [byDay stringByAppendingString: @"TU"];
break;
case iCalWeekDayWednesday:
byDay = [byDay stringByAppendingString: @"WE"];
break;
case iCalWeekDayThursday:
byDay = [byDay stringByAppendingString: @"TH"];
break;
case iCalWeekDayFriday:
byDay = [byDay stringByAppendingString: @"FR"];
break;
case iCalWeekDaySaturday:
byDay = [byDay stringByAppendingString: @"SA"];
break;
}
result = [NSString stringWithFormat: @"FREQ=YEARLY;BYDAY=%@;BYMONTH=%d", byDay, date.wMonth];
return result;
}
- (iCalTimeZone *) iCalTimeZoneFromDefinition: (NSData *) value
withDescription: (NSString *) description
inMemCtx: (TALLOC_CTX *) memCtx
{
BOOL daylightDefined = NO, ruleFound = NO;
iCalDateTime *daylightStart, *standardStart;
iCalRecurrenceRule *daylightRRule, *standardRRule;
iCalTimeZone *tz = nil;
iCalTimeZonePeriod *daylight, *standard;
NSCalendarDate *dlStartValue, *stStartValue;
NSString *strOffsetFrom, *strOffsetTo, *tzID;
char *keyName;
struct Binary_r *binValue;
struct SYSTEMTIME initDate;
struct TimeZoneDefinition *definition;
struct TZRule rule;
uint16_t count;
binValue = [value asBinaryInMemCtx: memCtx];
definition = get_TimeZoneDefinition (memCtx, binValue);
if (!definition)
return nil;
if (!definition->cRules)
goto end;
for (count = 0; count < definition->cRules; count++)
{
/* ([MS-OXCICAL] 2.1.3.1.1.19) The TZRule with the
TZRULE_FLAG_EFFECTIVE_TZREG bit set in the TZRule flags field
is the one that MUST be exported */
if (definition->TZRules[count].flags & TZRULE_FLAG_EFFECTIVE_TZREG)
{
rule = definition->TZRules[count];
ruleFound = YES;
break;
}
}
if (!ruleFound)
goto end;
if (!description)
{
/* The cbHeader field contains the size, in bytes of the Reserved (2b),
cchKeyName (2b) keyName (variable Unicode string) and cRules (2b)
([MS-OXOCAL] 2.2.1.41). The keyName field is a non-NULL-terminated
char array. */
keyName = talloc_strndup (memCtx, definition->keyName, (definition->cbHeader - 6) / 2);
tzID = [NSString stringWithCString: keyName
encoding: [NSString defaultCStringEncoding]];
talloc_free (keyName);
}
else
tzID = [NSString stringWithString: description];
tz = [iCalTimeZone groupWithTag: @"vtimezone"];
[tz addChild: [CardElement simpleElementWithTag: @"tzid"
value: tzID]];
if (rule.stStandardDate.wMonth != 0)
daylightDefined = YES;
/* STANDARD TIME ([MS-OXCICAL] 2.1.3.1.1.19.2) */
standard = [iCalTimeZonePeriod groupWithTag: @"standard"];
/* TZOFFSETFROM = -1 * (PidLidTimeZoneStruct.lBias + PidLidTimeZoneStruct.lDaylightBias) */
strOffsetFrom = [self _offsetStringFromOffset: -1 * (rule.lBias + rule.lDaylightBias)];
[standard addChild: [CardElement simpleElementWithTag: @"tzoffsetfrom"
value: strOffsetFrom]];
/* TZOFFSETTO = -1 * (PidLidTimeZoneStruct.lBias + PidLidTimeZoneStruct.lStandardBias) */
strOffsetTo = [self _offsetStringFromOffset: -1 * (rule.lBias + rule.lStandardBias)];
[standard addChild: [CardElement simpleElementWithTag: @"tzoffsetto"
value: strOffsetTo]];
/* DTSTART & RRULE are derived from the stStandardDate and wYear properties */
standardStart = [iCalDateTime elementWithTag: @"dtstart"];
initDate = rule.stStandardDate;
stStartValue = [NSCalendarDate dateFromSystemTime: initDate
andRuleYear: rule.wYear];
[standardStart setDateTime: stStartValue];
[standard addChild: standardStart];
if (daylightDefined)
{
standardRRule = [[iCalRecurrenceRule alloc] initWithString: [self _rRuleStringFromSystemTime: initDate]];
[standard addChild: standardRRule];
/* DAYLIGHT SAVING TIME ([MS-OXCICAL] 2.1.3.1.1.19.3) */
daylight = [iCalTimeZonePeriod groupWithTag: @"daylight"];
/* TZOFFSETFROM = -1 * (PidLidTimeZoneStruct.lBias + PidLidTimeZoneStruct.lStandardBias) */
[daylight addChild: [CardElement simpleElementWithTag: @"tzoffsetfrom"
value: strOffsetTo]];
/* TZOFFSETTO = -1 * (PidLidTimeZoneStruct.lBias + PidLidTimeZoneStruct.lDaylightBias) */
[daylight addChild: [CardElement simpleElementWithTag: @"tzoffsetto"
value: strOffsetFrom]];
/* DTSTART & RRULE are derived from the stDaylightDate and wYear properties */
daylightStart = [iCalDateTime elementWithTag: @"dtstart"];
initDate = rule.stDaylightDate;
dlStartValue = [NSCalendarDate dateFromSystemTime: initDate
andRuleYear: rule.wYear];
[daylightStart setDateTime: dlStartValue];
[daylight addChild: daylightStart];
daylightRRule = [[iCalRecurrenceRule alloc] initWithString: [self _rRuleStringFromSystemTime: initDate]];
[daylight addChild: daylightRRule];
[tz addChild: daylight];
}
[tz addChild: standard];
end:
talloc_free (definition);
return tz;
}
/**
* Adjust a date in this vTimeZone to its representation in UTC
* Example: Timezone is +0001, the date is 2015-12-15 00:00:00 +0000
* it returns 2015-12-14 23:00:00 +0000
* @param date the date to adjust to the timezone.
* @return a new GMT date adjusted with the offset of the timezone.
*/
- (NSCalendarDate *) shiftedCalendarDateForDate: (NSCalendarDate *) date
{
NSCalendarDate *tmpDate;
tmpDate = [date copy];
[tmpDate autorelease];
[tmpDate setTimeZone: utcTZ];
return [tmpDate addYear: 0 month: 0 day: 0
hour: 0 minute: 0
second: -[[self periodForDate: tmpDate] secondsOffsetFromGMT]];
}
@end
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