/* java.util.VMTimeZone
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
Free Software Foundation, Inc.
This file is part of GNU Classpath.
package java.util;
import gnu.classpath.Configuration;
+import java.util.TimeZone;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
import java.io.*;
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[4];
- dis.readFully(tzif);
- if (tzif[0] == 'T' && tzif[1] == 'Z'
- && tzif[2] == 'i' && tzif[3] == 'f')
- // Reserved bytes, ttisgmtcnt, ttisstdcnt and leapcnt
- skipFully(dis, 16 + 3 * 4);
+ 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 + 3 * 4 - 4);
-
+ 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 charcnt = dis.readInt();
- // Transition times plus indexed transition times.
- skipFully(dis, timecnt * (4 + 1));
-
- // Get last gmt_offset and dst/non-dst time zone names.
- int abbrind = -1;
+ 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 gmt_offset = 0;
- while (typecnt-- > 0)
+ 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)
{
- abbrind = dis.readByte();
- gmt_offset = offset;
+ 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;
+ }
}
- else
- dst_abbrind = dis.readByte();
}
-
- // gmt_offset is the offset you must add to UTC/GMT to
- // get the local time, we need the offset to add to
- // the local time to get UTC/GMT.
- gmt_offset *= -1;
-
- // Turn into hours if possible.
- if (gmt_offset % 3600 == 0)
- gmt_offset /= 3600;
-
- if (abbrind >= 0)
+
+ if (std_abbrind >= 0)
{
byte[] names = new byte[charcnt];
dis.readFully(names);
- int j = abbrind;
+ int j = std_abbrind;
while (j < charcnt && names[j] != 0)
j++;
-
- String zonename = new String(names, abbrind, j - abbrind,
- "ASCII");
-
+
+ String zonename = new String(names, std_abbrind,
+ j - std_abbrind, "ASCII");
+
String dst_zonename;
if (dst_abbrind >= 0)
{
}
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;
- if ("".equals(dst_zonename)
- && (gmt_offset == 0
+ 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(gmt_offset);
-
- String id = zonename + offset_string + dst_zonename;
-
- return id;
+ {
+ 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);
}
-
- // Something didn't match while reading the file.
- return null;
+ 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)
{
projects / platform / upstream / linaro-gcc.git / commitdiff