cc297c1e03
2007-02-09 Jakub Jelinek <jakub@redhat.com> * java/util/VMTimeZone.java: Rewrite to handle both the old 'TZif\0' format and the new one. From-SVN: r121845
692 lines
20 KiB
Java
692 lines
20 KiB
Java
/* java.util.VMTimeZone
|
|
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
|
|
Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath 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 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.util;
|
|
|
|
import gnu.classpath.Configuration;
|
|
import java.util.TimeZone;
|
|
import java.util.Calendar;
|
|
import java.util.GregorianCalendar;
|
|
|
|
import java.io.*;
|
|
|
|
/**
|
|
*
|
|
*/
|
|
final class VMTimeZone
|
|
{
|
|
static
|
|
{
|
|
if (Configuration.INIT_LOAD_LIBRARY)
|
|
{
|
|
System.loadLibrary("javautil");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This method returns a time zone id string which is in the form
|
|
* (standard zone name) or (standard zone name)(GMT offset) or
|
|
* (standard zone name)(GMT offset)(daylight time zone name). The
|
|
* GMT offset can be in seconds, or where it is evenly divisible by
|
|
* 3600, then it can be in hours. The offset must be the time to
|
|
* add to the local time to get GMT. If a offset is given and the
|
|
* time zone observes daylight saving then the (daylight time zone
|
|
* name) must also be given (otherwise it is assumed the time zone
|
|
* does not observe any daylight savings).
|
|
* <p>
|
|
* The result of this method is given to the method
|
|
* TimeZone.getDefaultTimeZone(String) which tries to map the time
|
|
* zone id to a known TimeZone. See that method on how the returned
|
|
* String is mapped to a real TimeZone object.
|
|
* <p>
|
|
* The reference implementation which is made for GNU/Posix like
|
|
* systems calls <code>System.getenv("TZ")</code>,
|
|
* <code>readTimeZoneFile("/etc/timezone")</code>,
|
|
* <code>readtzFile("/etc/localtime")</code> and finally
|
|
* <code>getSystemTimeZoneId()</code> till a supported TimeZone is
|
|
* found through <code>TimeZone.getDefaultTimeZone(String)</code>.
|
|
* If every method fails <code>null</code> is returned (which means
|
|
* the TimeZone code will fall back on GMT as default time zone).
|
|
* <p>
|
|
* Note that this method is called inside a
|
|
* <code>AccessController.doPrivileged()</code> block and runs with
|
|
* the priviliges of the java.util system classes. It will only be
|
|
* called when the default time zone is not yet set, the system
|
|
* property user.timezone isn't set and it is requested for the
|
|
* first time.
|
|
*/
|
|
static TimeZone getDefaultTimeZoneId()
|
|
{
|
|
TimeZone zone = null;
|
|
|
|
// See if TZ environment variable is set and accessible.
|
|
String tzid = System.getenv("TZ");
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
|
|
// Try to parse /etc/timezone.
|
|
if (zone == null)
|
|
{
|
|
tzid = readTimeZoneFile("/etc/timezone");
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
}
|
|
|
|
// Try to parse /etc/localtime
|
|
if (zone == null)
|
|
{
|
|
tzid = readtzFile("/etc/localtime");
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
}
|
|
|
|
// Try some system specific way
|
|
if (zone == null)
|
|
{
|
|
tzid = getSystemTimeZoneId();
|
|
if (tzid != null && !tzid.equals(""))
|
|
zone = TimeZone.getDefaultTimeZone(tzid);
|
|
}
|
|
|
|
return zone;
|
|
}
|
|
|
|
/**
|
|
* Tries to read the time zone name from a file. Only the first
|
|
* consecutive letters, digits, slashes, dashes and underscores are
|
|
* read from the file. If the file cannot be read or an IOException
|
|
* occurs null is returned.
|
|
* <p>
|
|
* The /etc/timezone file is not standard, but a lot of systems have
|
|
* it. If it exist the first line always contains a string
|
|
* describing the timezone of the host of domain. Some systems
|
|
* contain a /etc/TIMEZONE file which is used to set the TZ
|
|
* environment variable (which is checked before /etc/timezone is
|
|
* read).
|
|
*/
|
|
private static String readTimeZoneFile(String file)
|
|
{
|
|
File f = new File(file);
|
|
if (!f.exists())
|
|
return null;
|
|
|
|
InputStreamReader isr = null;
|
|
try
|
|
{
|
|
FileInputStream fis = new FileInputStream(f);
|
|
BufferedInputStream bis = new BufferedInputStream(fis);
|
|
isr = new InputStreamReader(bis);
|
|
|
|
StringBuffer sb = new StringBuffer();
|
|
int i = isr.read();
|
|
while (i != -1)
|
|
{
|
|
char c = (char) i;
|
|
if (Character.isLetter(c) || Character.isDigit(c)
|
|
|| c == '/' || c == '-' || c == '_')
|
|
{
|
|
sb.append(c);
|
|
i = isr.read();
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
return sb.toString();
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Parse error, not a proper tzfile.
|
|
return null;
|
|
}
|
|
finally
|
|
{
|
|
try
|
|
{
|
|
if (isr != null)
|
|
isr.close();
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Error while close, nothing we can do.
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Tries to read a file as a "standard" tzfile and return a time
|
|
* zone id string as expected by <code>getDefaultTimeZone(String)</code>.
|
|
* If the file doesn't exist, an IOException occurs or it isn't a tzfile
|
|
* that can be parsed null is returned.
|
|
* <p>
|
|
* The tzfile structure (as also used by glibc) is described in the Olson
|
|
* tz database archive as can be found at
|
|
* <code>ftp://elsie.nci.nih.gov/pub/</code>.
|
|
* <p>
|
|
* At least the following platforms support the tzdata file format
|
|
* and /etc/localtime (GNU/Linux, Darwin, Solaris and FreeBSD at
|
|
* least). Some systems (like Darwin) don't start the file with the
|
|
* required magic bytes 'TZif', this implementation can handle
|
|
* that).
|
|
*/
|
|
private static String readtzFile(String file)
|
|
{
|
|
File f = new File(file);
|
|
if (!f.exists())
|
|
return null;
|
|
|
|
DataInputStream dis = null;
|
|
try
|
|
{
|
|
FileInputStream fis = new FileInputStream(f);
|
|
BufferedInputStream bis = new BufferedInputStream(fis);
|
|
dis = new DataInputStream(bis);
|
|
|
|
// Make sure we are reading a tzfile.
|
|
byte[] tzif = new byte[5];
|
|
dis.readFully(tzif);
|
|
int tzif2 = 4;
|
|
if (tzif[0] == 'T' && tzif[1] == 'Z'
|
|
&& tzif[2] == 'i' && tzif[3] == 'f')
|
|
{
|
|
if (tzif[4] >= '2')
|
|
tzif2 = 8;
|
|
// Reserved bytes
|
|
skipFully(dis, 16 - 1);
|
|
}
|
|
else
|
|
// Darwin has tzdata files that don't start with the TZif marker
|
|
skipFully(dis, 16 - 5);
|
|
|
|
String id = null;
|
|
int ttisgmtcnt = dis.readInt();
|
|
int ttisstdcnt = dis.readInt();
|
|
int leapcnt = dis.readInt();
|
|
int timecnt = dis.readInt();
|
|
int typecnt = dis.readInt();
|
|
int charcnt = dis.readInt();
|
|
if (tzif2 == 8)
|
|
{
|
|
skipFully(dis, timecnt * (4 + 1) + typecnt * (4 + 1 + 1) + charcnt
|
|
+ leapcnt * (4 + 4) + ttisgmtcnt + ttisstdcnt);
|
|
|
|
dis.readFully(tzif);
|
|
if (tzif[0] != 'T' || tzif[1] != 'Z' || tzif[2] != 'i'
|
|
|| tzif[3] != 'f' || tzif[4] < '2')
|
|
return null;
|
|
|
|
// Reserved bytes
|
|
skipFully(dis, 16 - 1);
|
|
ttisgmtcnt = dis.readInt();
|
|
ttisstdcnt = dis.readInt();
|
|
leapcnt = dis.readInt();
|
|
timecnt = dis.readInt();
|
|
typecnt = dis.readInt();
|
|
charcnt = dis.readInt();
|
|
}
|
|
if (typecnt > 0)
|
|
{
|
|
int seltimecnt = timecnt;
|
|
if (seltimecnt > 16)
|
|
seltimecnt = 16;
|
|
|
|
long[] times = new long[seltimecnt];
|
|
int[] types = new int[seltimecnt];
|
|
|
|
// Transition times
|
|
skipFully(dis, (timecnt - seltimecnt) * tzif2);
|
|
|
|
for (int i = 0; i < seltimecnt; i++)
|
|
if (tzif2 == 8)
|
|
times[i] = dis.readLong();
|
|
else
|
|
times[i] = (long) dis.readInt();
|
|
|
|
// Transition types
|
|
skipFully(dis, timecnt - seltimecnt);
|
|
for (int i = 0; i < seltimecnt; i++)
|
|
{
|
|
types[i] = dis.readByte();
|
|
if (types[i] < 0)
|
|
types[i] += 256;
|
|
}
|
|
|
|
// Get std/dst_offset and dst/non-dst time zone names.
|
|
int std_abbrind = -1;
|
|
int dst_abbrind = -1;
|
|
int std_offset = 0;
|
|
int dst_offset = 0;
|
|
int std_ind = -1;
|
|
int dst_ind = -1;
|
|
|
|
int alternation = 0;
|
|
if (seltimecnt >= 4 && types[0] != types[1]
|
|
&& types[0] < typecnt && types[1] < typecnt)
|
|
{
|
|
// Verify only two types are involved
|
|
// in the transitions and they alternate.
|
|
alternation = 1;
|
|
for (int i = 2; i < seltimecnt; i++)
|
|
if (types[i] != types[i % 2])
|
|
alternation = 0;
|
|
}
|
|
|
|
// If a timezone previously used DST, but no longer does
|
|
// (or no longer will in the near future, say 5 years),
|
|
// then always pick only the std zone type corresponding
|
|
// to latest applicable transition.
|
|
if (seltimecnt > 0
|
|
&& times[seltimecnt - 1]
|
|
< System.currentTimeMillis() / 1000 + 5 * 365 * 86400)
|
|
alternation = -1;
|
|
|
|
for (int i = 0; i < typecnt; i++)
|
|
{
|
|
// gmtoff
|
|
int offset = dis.readInt();
|
|
int dst = dis.readByte();
|
|
int abbrind = dis.readByte();
|
|
if (dst == 0)
|
|
{
|
|
if (alternation == 0
|
|
|| (alternation == 1
|
|
&& (i == types[0] || i == types[1]))
|
|
|| (alternation == -1 && i == types[seltimecnt - 1]))
|
|
{
|
|
std_abbrind = abbrind;
|
|
std_offset = offset * -1;
|
|
std_ind = i;
|
|
}
|
|
}
|
|
else if (alternation >= 0)
|
|
{
|
|
if (alternation == 0 || i == types[0] || i == types[1])
|
|
{
|
|
dst_abbrind = abbrind;
|
|
dst_offset = offset * -1;
|
|
dst_ind = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (std_abbrind >= 0)
|
|
{
|
|
byte[] names = new byte[charcnt];
|
|
dis.readFully(names);
|
|
int j = std_abbrind;
|
|
while (j < charcnt && names[j] != 0)
|
|
j++;
|
|
|
|
String zonename = new String(names, std_abbrind,
|
|
j - std_abbrind, "ASCII");
|
|
|
|
String dst_zonename;
|
|
if (dst_abbrind >= 0)
|
|
{
|
|
j = dst_abbrind;
|
|
while (j < charcnt && names[j] != 0)
|
|
j++;
|
|
dst_zonename = new String(names, dst_abbrind,
|
|
j - dst_abbrind, "ASCII");
|
|
}
|
|
else
|
|
dst_zonename = "";
|
|
|
|
String[] change_spec = { null, null };
|
|
if (dst_abbrind >= 0 && alternation > 0)
|
|
{
|
|
// Guess rules for the std->dst and dst->std transitions
|
|
// from the transition times since Epoch.
|
|
// tzdata actually uses only 3 forms of rules:
|
|
// fixed date within a month, e.g. change on April, 5th
|
|
// 1st weekday on or after Nth: change on Sun>=15 in April
|
|
// last weekday in a month: change on lastSun in April
|
|
GregorianCalendar cal
|
|
= new GregorianCalendar (TimeZone.getTimeZone("GMT"));
|
|
|
|
int[] values = new int[2 * 11];
|
|
int i;
|
|
for (i = seltimecnt - 1; i >= 0; i--)
|
|
{
|
|
int base = (i % 2) * 11;
|
|
int offset = types[i] == dst_ind ? std_offset : dst_offset;
|
|
cal.setTimeInMillis((times[i] - offset) * 1000);
|
|
if (i >= seltimecnt - 2)
|
|
{
|
|
values[base + 0] = cal.get(Calendar.YEAR);
|
|
values[base + 1] = cal.get(Calendar.MONTH);
|
|
values[base + 2] = cal.get(Calendar.DAY_OF_MONTH);
|
|
values[base + 3]
|
|
= cal.getActualMaximum(Calendar.DAY_OF_MONTH);
|
|
values[base + 4] = cal.get(Calendar.DAY_OF_WEEK);
|
|
values[base + 5] = cal.get(Calendar.HOUR_OF_DAY);
|
|
values[base + 6] = cal.get(Calendar.MINUTE);
|
|
values[base + 7] = cal.get(Calendar.SECOND);
|
|
values[base + 8] = values[base + 2]; // Range start
|
|
values[base + 9] = values[base + 2]; // Range end
|
|
values[base + 10] = 0; // Determined type
|
|
}
|
|
else
|
|
{
|
|
int year = cal.get(Calendar.YEAR);
|
|
int month = cal.get(Calendar.MONTH);
|
|
int day_of_month = cal.get(Calendar.DAY_OF_MONTH);
|
|
int month_days
|
|
= cal.getActualMaximum(Calendar.DAY_OF_MONTH);
|
|
int day_of_week = cal.get(Calendar.DAY_OF_WEEK);
|
|
int hour = cal.get(Calendar.HOUR_OF_DAY);
|
|
int minute = cal.get(Calendar.MINUTE);
|
|
int second = cal.get(Calendar.SECOND);
|
|
if (year != values[base + 0] - 1
|
|
|| month != values[base + 1]
|
|
|| hour != values[base + 5]
|
|
|| minute != values[base + 6]
|
|
|| second != values[base + 7])
|
|
break;
|
|
if (day_of_week == values[base + 4])
|
|
{
|
|
// Either a Sun>=8 or lastSun rule.
|
|
if (day_of_month < values[base + 8])
|
|
values[base + 8] = day_of_month;
|
|
if (day_of_month > values[base + 9])
|
|
values[base + 9] = day_of_month;
|
|
if (values[base + 10] < 0)
|
|
break;
|
|
if (values[base + 10] == 0)
|
|
{
|
|
values[base + 10] = 1;
|
|
// If day of month > 28, this is
|
|
// certainly lastSun rule.
|
|
if (values[base + 2] > 28)
|
|
values[base + 2] = 3;
|
|
// If day of month isn't in the last
|
|
// week, it can't be lastSun rule.
|
|
else if (values[base + 2]
|
|
<= values[base + 3] - 7)
|
|
values[base + 3] = 2;
|
|
}
|
|
if (values[base + 10] == 1)
|
|
{
|
|
// If day of month is > 28, this is
|
|
// certainly lastSun rule.
|
|
if (day_of_month > 28)
|
|
values[base + 10] = 3;
|
|
// If day of month isn't in the last
|
|
// week, it can't be lastSun rule.
|
|
else if (day_of_month <= month_days - 7)
|
|
values[base + 10] = 2;
|
|
}
|
|
else if ((values[base + 10] == 2
|
|
&& day_of_month > 28)
|
|
|| (values[base + 10] == 3
|
|
&& day_of_month
|
|
<= month_days - 7))
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
// Must be fixed day in month rule.
|
|
if (day_of_month != values[base + 2]
|
|
|| values[base + 10] > 0)
|
|
break;
|
|
values[base + 4] = day_of_week;
|
|
values[base + 10] = -1;
|
|
}
|
|
values[base + 0] -= 1;
|
|
}
|
|
}
|
|
if (i < 0)
|
|
{
|
|
for (i = 0; i < 2; i++)
|
|
{
|
|
int base = 11 * i;
|
|
if (values[base + 10] == 0)
|
|
continue;
|
|
if (values[base + 10] == -1)
|
|
{
|
|
int[] dayCount
|
|
= { 0, 31, 59, 90, 120, 151,
|
|
181, 212, 243, 273, 304, 334 };
|
|
int d = dayCount[values[base + 1]
|
|
- Calendar.JANUARY];
|
|
d += values[base + 2];
|
|
change_spec[i] = ",J" + Integer.toString(d);
|
|
}
|
|
else if (values[base + 10] == 2)
|
|
{
|
|
// If we haven't seen all days of the week,
|
|
// we can't be sure what the rule really is.
|
|
if (values[base + 8] + 6 != values[base + 9])
|
|
continue;
|
|
|
|
// FIXME: Sun >= 5 is representable in
|
|
// SimpleTimeZone, but not in POSIX TZ env
|
|
// strings. Should we change readtzFile
|
|
// to actually return a SimpleTimeZone
|
|
// rather than POSIX TZ string?
|
|
if ((values[base + 8] % 7) != 1)
|
|
continue;
|
|
|
|
int d;
|
|
d = values[base + 1] - Calendar.JANUARY + 1;
|
|
change_spec[i] = ",M" + Integer.toString(d);
|
|
d = (values[base + 8] + 6) / 7;
|
|
change_spec[i] += "." + Integer.toString(d);
|
|
d = values[base + 4] - Calendar.SUNDAY;
|
|
change_spec[i] += "." + Integer.toString(d);
|
|
}
|
|
else
|
|
{
|
|
// If we don't know whether this is lastSun or
|
|
// Sun >= 22 rule. That can be either because
|
|
// there was insufficient number of
|
|
// transitions, or February, where it is quite
|
|
// probable we haven't seen any 29th dates.
|
|
// For February, assume lastSun rule, otherwise
|
|
// punt.
|
|
if (values[base + 10] == 1
|
|
&& values[base + 1] != Calendar.FEBRUARY)
|
|
continue;
|
|
|
|
int d;
|
|
d = values[base + 1] - Calendar.JANUARY + 1;
|
|
change_spec[i] = ",M" + Integer.toString(d);
|
|
d = values[base + 4] - Calendar.SUNDAY;
|
|
change_spec[i] += ".5." + Integer.toString(d);
|
|
}
|
|
|
|
// Don't add time specification if time is
|
|
// 02:00:00.
|
|
if (values[base + 5] != 2
|
|
|| values[base + 6] != 0
|
|
|| values[base + 7] != 0)
|
|
{
|
|
int d = values[base + 5];
|
|
change_spec[i] += "/" + Integer.toString(d);
|
|
if (values[base + 6] != 0
|
|
|| values[base + 7] != 0)
|
|
{
|
|
d = values[base + 6];
|
|
if (d < 10)
|
|
change_spec[i]
|
|
+= ":0" + Integer.toString(d);
|
|
else
|
|
change_spec[i]
|
|
+= ":" + Integer.toString(d);
|
|
d = values[base + 7];
|
|
if (d >= 10)
|
|
change_spec[i]
|
|
+= ":" + Integer.toString(d);
|
|
else if (d > 0)
|
|
change_spec[i]
|
|
+= ":0" + Integer.toString(d);
|
|
}
|
|
}
|
|
}
|
|
if (types[0] == std_ind)
|
|
{
|
|
String tmp = change_spec[0];
|
|
change_spec[0] = change_spec[1];
|
|
change_spec[1] = tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Only use gmt offset when necessary.
|
|
// Also special case GMT+/- timezones.
|
|
String offset_string, dst_offset_string = "";
|
|
if (dst_abbrind < 0
|
|
&& (std_offset == 0
|
|
|| zonename.startsWith("GMT+")
|
|
|| zonename.startsWith("GMT-")))
|
|
offset_string = "";
|
|
else
|
|
{
|
|
offset_string = Integer.toString(std_offset / 3600);
|
|
int seconds = std_offset % 3600;
|
|
if (seconds != 0)
|
|
{
|
|
if (seconds < 0)
|
|
seconds *= -1;
|
|
if (seconds < 600)
|
|
offset_string
|
|
+= ":0" + Integer.toString(seconds / 60);
|
|
else
|
|
offset_string
|
|
+= ":" + Integer.toString(seconds / 60);
|
|
seconds = seconds % 60;
|
|
if (seconds >= 10)
|
|
offset_string
|
|
+= ":" + Integer.toString(seconds);
|
|
else if (seconds > 0)
|
|
offset_string
|
|
+= ":0" + Integer.toString(seconds);
|
|
}
|
|
if (dst_abbrind >= 0
|
|
&& dst_offset != std_offset - 3600)
|
|
{
|
|
dst_offset_string
|
|
= Integer.toString(dst_offset / 3600);
|
|
seconds = dst_offset % 3600;
|
|
if (seconds != 0)
|
|
{
|
|
if (seconds < 0)
|
|
seconds *= -1;
|
|
if (seconds < 600)
|
|
dst_offset_string
|
|
+= ":0" + Integer.toString(seconds / 60);
|
|
else
|
|
dst_offset_string
|
|
+= ":" + Integer.toString(seconds / 60);
|
|
seconds = seconds % 60;
|
|
if (seconds >= 10)
|
|
dst_offset_string
|
|
+= ":" + Integer.toString(seconds);
|
|
else if (seconds > 0)
|
|
dst_offset_string
|
|
+= ":0" + Integer.toString(seconds);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (dst_abbrind < 0)
|
|
id = zonename + offset_string;
|
|
else if (change_spec[0] != null && change_spec[1] != null)
|
|
id = zonename + offset_string + dst_zonename
|
|
+ dst_offset_string + change_spec[0] + change_spec[1];
|
|
}
|
|
else if (tzif2 == 8)
|
|
skipFully(dis, charcnt);
|
|
}
|
|
else if (tzif2 == 8)
|
|
skipFully(dis, timecnt * (8 + 1) + typecnt * (4 + 1 + 1) + charcnt);
|
|
|
|
if (tzif2 == 8)
|
|
{
|
|
// Skip over the rest of 64-bit data
|
|
skipFully(dis, leapcnt * (8 + 4) + ttisgmtcnt + ttisstdcnt);
|
|
if (dis.readByte() == '\n')
|
|
{
|
|
String posixtz = dis.readLine();
|
|
if (posixtz.length() > 0)
|
|
id = posixtz;
|
|
}
|
|
}
|
|
|
|
return id;
|
|
}
|
|
catch (IOException ioe)
|
|
{
|
|
// Parse error, not a proper tzfile.
|
|
return null;
|
|
}
|
|
finally
|
|
{
|
|
try
|
|
{
|
|
if (dis != null)
|
|
dis.close();
|
|
}
|
|
catch(IOException ioe)
|
|
{
|
|
// Error while close, nothing we can do.
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Skips the requested number of bytes in the given InputStream.
|
|
* Throws EOFException if not enough bytes could be skipped.
|
|
* Negative numbers of bytes to skip are ignored.
|
|
*/
|
|
private static void skipFully(InputStream is, long l) throws IOException
|
|
{
|
|
while (l > 0)
|
|
{
|
|
long k = is.skip(l);
|
|
if (k <= 0)
|
|
throw new EOFException();
|
|
l -= k;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Tries to get the system time zone id through native code.
|
|
*/
|
|
private static native String getSystemTimeZoneId();
|
|
}
|