VMTimeZone.java: Rewrite to handle both the old 'TZif\0' format and the new one.
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
This commit is contained in:
Jakub Jelinek
Andrew Haley
parent
9b3ffe5f7a
commit
cc297c1e03
3 changed files with 407 additions and 55 deletions
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@ -1,5 +1,5 @@
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/* java.util.VMTimeZone
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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@ -40,6 +40,9 @@ exception statement from your version. */
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package java.util;
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import gnu.classpath.Configuration;
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import java.util.TimeZone;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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import java.io.*;
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@ -206,71 +209,152 @@ final class VMTimeZone
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File f = new File(file);
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if (!f.exists())
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return null;
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DataInputStream dis = null;
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try
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{
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FileInputStream fis = new FileInputStream(f);
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BufferedInputStream bis = new BufferedInputStream(fis);
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dis = new DataInputStream(bis);
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// Make sure we are reading a tzfile.
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byte[] tzif = new byte[4];
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dis.readFully(tzif);
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if (tzif[0] == 'T' && tzif[1] == 'Z'
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&& tzif[2] == 'i' && tzif[3] == 'f')
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// Reserved bytes, ttisgmtcnt, ttisstdcnt and leapcnt
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skipFully(dis, 16 + 3 * 4);
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FileInputStream fis = new FileInputStream(f);
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BufferedInputStream bis = new BufferedInputStream(fis);
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dis = new DataInputStream(bis);
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// Make sure we are reading a tzfile.
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byte[] tzif = new byte[5];
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dis.readFully(tzif);
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int tzif2 = 4;
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if (tzif[0] == 'T' && tzif[1] == 'Z'
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&& tzif[2] == 'i' && tzif[3] == 'f')
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{
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if (tzif[4] >= '2')
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tzif2 = 8;
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// Reserved bytes
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skipFully(dis, 16 - 1);
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}
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else
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// Darwin has tzdata files that don't start with the TZif marker
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skipFully(dis, 16 + 3 * 4 - 4);
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skipFully(dis, 16 - 5);
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String id = null;
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int ttisgmtcnt = dis.readInt();
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int ttisstdcnt = dis.readInt();
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int leapcnt = dis.readInt();
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int timecnt = dis.readInt();
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int typecnt = dis.readInt();
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int charcnt = dis.readInt();
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if (tzif2 == 8)
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{
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skipFully(dis, timecnt * (4 + 1) + typecnt * (4 + 1 + 1) + charcnt
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+ leapcnt * (4 + 4) + ttisgmtcnt + ttisstdcnt);
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dis.readFully(tzif);
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if (tzif[0] != 'T' || tzif[1] != 'Z' || tzif[2] != 'i'
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|| tzif[3] != 'f' || tzif[4] < '2')
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return null;
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// Reserved bytes
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skipFully(dis, 16 - 1);
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ttisgmtcnt = dis.readInt();
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ttisstdcnt = dis.readInt();
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leapcnt = dis.readInt();
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timecnt = dis.readInt();
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typecnt = dis.readInt();
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charcnt = dis.readInt();
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}
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if (typecnt > 0)
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{
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int charcnt = dis.readInt();
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// Transition times plus indexed transition times.
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skipFully(dis, timecnt * (4 + 1));
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// Get last gmt_offset and dst/non-dst time zone names.
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int abbrind = -1;
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int seltimecnt = timecnt;
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if (seltimecnt > 16)
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seltimecnt = 16;
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long[] times = new long[seltimecnt];
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int[] types = new int[seltimecnt];
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// Transition times
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skipFully(dis, (timecnt - seltimecnt) * tzif2);
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for (int i = 0; i < seltimecnt; i++)
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if (tzif2 == 8)
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times[i] = dis.readLong();
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else
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times[i] = (long) dis.readInt();
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// Transition types
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skipFully(dis, timecnt - seltimecnt);
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for (int i = 0; i < seltimecnt; i++)
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{
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types[i] = dis.readByte();
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if (types[i] < 0)
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types[i] += 256;
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}
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// Get std/dst_offset and dst/non-dst time zone names.
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int std_abbrind = -1;
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int dst_abbrind = -1;
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int gmt_offset = 0;
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while (typecnt-- > 0)
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int std_offset = 0;
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int dst_offset = 0;
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int std_ind = -1;
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int dst_ind = -1;
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int alternation = 0;
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if (seltimecnt >= 4 && types[0] != types[1]
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&& types[0] < typecnt && types[1] < typecnt)
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{
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// Verify only two types are involved
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// in the transitions and they alternate.
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alternation = 1;
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for (int i = 2; i < seltimecnt; i++)
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if (types[i] != types[i % 2])
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alternation = 0;
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}
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// If a timezone previously used DST, but no longer does
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// (or no longer will in the near future, say 5 years),
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// then always pick only the std zone type corresponding
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// to latest applicable transition.
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if (seltimecnt > 0
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&& times[seltimecnt - 1]
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< System.currentTimeMillis() / 1000 + 5 * 365 * 86400)
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alternation = -1;
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for (int i = 0; i < typecnt; i++)
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{
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// gmtoff
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int offset = dis.readInt();
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int dst = dis.readByte();
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int abbrind = dis.readByte();
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if (dst == 0)
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{
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abbrind = dis.readByte();
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gmt_offset = offset;
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if (alternation == 0
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|| (alternation == 1
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&& (i == types[0] || i == types[1]))
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|| (alternation == -1 && i == types[seltimecnt - 1]))
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{
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std_abbrind = abbrind;
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std_offset = offset * -1;
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std_ind = i;
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}
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}
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else if (alternation >= 0)
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{
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if (alternation == 0 || i == types[0] || i == types[1])
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{
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dst_abbrind = abbrind;
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dst_offset = offset * -1;
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dst_ind = i;
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}
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}
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else
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dst_abbrind = dis.readByte();
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}
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// gmt_offset is the offset you must add to UTC/GMT to
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// get the local time, we need the offset to add to
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// the local time to get UTC/GMT.
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gmt_offset *= -1;
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// Turn into hours if possible.
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if (gmt_offset % 3600 == 0)
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gmt_offset /= 3600;
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if (abbrind >= 0)
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if (std_abbrind >= 0)
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{
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byte[] names = new byte[charcnt];
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dis.readFully(names);
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int j = abbrind;
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int j = std_abbrind;
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while (j < charcnt && names[j] != 0)
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j++;
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String zonename = new String(names, abbrind, j - abbrind,
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"ASCII");
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String zonename = new String(names, std_abbrind,
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j - std_abbrind, "ASCII");
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String dst_zonename;
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if (dst_abbrind >= 0)
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{
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@ -282,26 +366,289 @@ final class VMTimeZone
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}
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else
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dst_zonename = "";
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String[] change_spec = { null, null };
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if (dst_abbrind >= 0 && alternation > 0)
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{
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// Guess rules for the std->dst and dst->std transitions
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// from the transition times since Epoch.
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// tzdata actually uses only 3 forms of rules:
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// fixed date within a month, e.g. change on April, 5th
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// 1st weekday on or after Nth: change on Sun>=15 in April
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// last weekday in a month: change on lastSun in April
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GregorianCalendar cal
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= new GregorianCalendar (TimeZone.getTimeZone("GMT"));
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int[] values = new int[2 * 11];
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int i;
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for (i = seltimecnt - 1; i >= 0; i--)
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{
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int base = (i % 2) * 11;
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int offset = types[i] == dst_ind ? std_offset : dst_offset;
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cal.setTimeInMillis((times[i] - offset) * 1000);
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if (i >= seltimecnt - 2)
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{
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values[base + 0] = cal.get(Calendar.YEAR);
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values[base + 1] = cal.get(Calendar.MONTH);
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values[base + 2] = cal.get(Calendar.DAY_OF_MONTH);
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values[base + 3]
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= cal.getActualMaximum(Calendar.DAY_OF_MONTH);
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values[base + 4] = cal.get(Calendar.DAY_OF_WEEK);
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values[base + 5] = cal.get(Calendar.HOUR_OF_DAY);
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values[base + 6] = cal.get(Calendar.MINUTE);
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values[base + 7] = cal.get(Calendar.SECOND);
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values[base + 8] = values[base + 2]; // Range start
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values[base + 9] = values[base + 2]; // Range end
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values[base + 10] = 0; // Determined type
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}
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else
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{
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int year = cal.get(Calendar.YEAR);
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int month = cal.get(Calendar.MONTH);
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int day_of_month = cal.get(Calendar.DAY_OF_MONTH);
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int month_days
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= cal.getActualMaximum(Calendar.DAY_OF_MONTH);
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int day_of_week = cal.get(Calendar.DAY_OF_WEEK);
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int hour = cal.get(Calendar.HOUR_OF_DAY);
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int minute = cal.get(Calendar.MINUTE);
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int second = cal.get(Calendar.SECOND);
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if (year != values[base + 0] - 1
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|| month != values[base + 1]
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|| hour != values[base + 5]
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|| minute != values[base + 6]
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|| second != values[base + 7])
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break;
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if (day_of_week == values[base + 4])
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{
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// Either a Sun>=8 or lastSun rule.
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if (day_of_month < values[base + 8])
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values[base + 8] = day_of_month;
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if (day_of_month > values[base + 9])
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values[base + 9] = day_of_month;
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if (values[base + 10] < 0)
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break;
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if (values[base + 10] == 0)
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{
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values[base + 10] = 1;
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// If day of month > 28, this is
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// certainly lastSun rule.
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if (values[base + 2] > 28)
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values[base + 2] = 3;
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// If day of month isn't in the last
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// week, it can't be lastSun rule.
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else if (values[base + 2]
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<= values[base + 3] - 7)
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values[base + 3] = 2;
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}
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if (values[base + 10] == 1)
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{
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// If day of month is > 28, this is
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// certainly lastSun rule.
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if (day_of_month > 28)
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values[base + 10] = 3;
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// If day of month isn't in the last
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// week, it can't be lastSun rule.
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else if (day_of_month <= month_days - 7)
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values[base + 10] = 2;
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}
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else if ((values[base + 10] == 2
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&& day_of_month > 28)
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|| (values[base + 10] == 3
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&& day_of_month
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<= month_days - 7))
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break;
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}
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else
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{
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// Must be fixed day in month rule.
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if (day_of_month != values[base + 2]
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|| values[base + 10] > 0)
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break;
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values[base + 4] = day_of_week;
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values[base + 10] = -1;
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}
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values[base + 0] -= 1;
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}
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}
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if (i < 0)
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{
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for (i = 0; i < 2; i++)
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{
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int base = 11 * i;
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if (values[base + 10] == 0)
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continue;
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if (values[base + 10] == -1)
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{
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int[] dayCount
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= { 0, 31, 59, 90, 120, 151,
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181, 212, 243, 273, 304, 334 };
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int d = dayCount[values[base + 1]
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- Calendar.JANUARY];
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d += values[base + 2];
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change_spec[i] = ",J" + Integer.toString(d);
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}
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else if (values[base + 10] == 2)
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{
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// If we haven't seen all days of the week,
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// we can't be sure what the rule really is.
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if (values[base + 8] + 6 != values[base + 9])
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continue;
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// FIXME: Sun >= 5 is representable in
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// SimpleTimeZone, but not in POSIX TZ env
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// strings. Should we change readtzFile
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// to actually return a SimpleTimeZone
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// rather than POSIX TZ string?
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if ((values[base + 8] % 7) != 1)
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continue;
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int d;
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d = values[base + 1] - Calendar.JANUARY + 1;
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change_spec[i] = ",M" + Integer.toString(d);
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d = (values[base + 8] + 6) / 7;
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change_spec[i] += "." + Integer.toString(d);
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d = values[base + 4] - Calendar.SUNDAY;
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change_spec[i] += "." + Integer.toString(d);
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}
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else
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{
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// If we don't know whether this is lastSun or
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// Sun >= 22 rule. That can be either because
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// there was insufficient number of
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// transitions, or February, where it is quite
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// probable we haven't seen any 29th dates.
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// For February, assume lastSun rule, otherwise
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// punt.
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if (values[base + 10] == 1
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&& values[base + 1] != Calendar.FEBRUARY)
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continue;
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int d;
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d = values[base + 1] - Calendar.JANUARY + 1;
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change_spec[i] = ",M" + Integer.toString(d);
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d = values[base + 4] - Calendar.SUNDAY;
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change_spec[i] += ".5." + Integer.toString(d);
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}
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// Don't add time specification if time is
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// 02:00:00.
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if (values[base + 5] != 2
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|| values[base + 6] != 0
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|| values[base + 7] != 0)
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{
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int d = values[base + 5];
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change_spec[i] += "/" + Integer.toString(d);
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if (values[base + 6] != 0
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|| values[base + 7] != 0)
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{
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d = values[base + 6];
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if (d < 10)
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change_spec[i]
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+= ":0" + Integer.toString(d);
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else
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change_spec[i]
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+= ":" + Integer.toString(d);
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d = values[base + 7];
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if (d >= 10)
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change_spec[i]
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+= ":" + Integer.toString(d);
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else if (d > 0)
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change_spec[i]
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+= ":0" + Integer.toString(d);
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}
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}
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}
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if (types[0] == std_ind)
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{
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String tmp = change_spec[0];
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change_spec[0] = change_spec[1];
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change_spec[1] = tmp;
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}
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}
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}
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// Only use gmt offset when necessary.
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// Also special case GMT+/- timezones.
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String offset_string;
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if ("".equals(dst_zonename)
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&& (gmt_offset == 0
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String offset_string, dst_offset_string = "";
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if (dst_abbrind < 0
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&& (std_offset == 0
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|| zonename.startsWith("GMT+")
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|| zonename.startsWith("GMT-")))
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offset_string = "";
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else
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offset_string = Integer.toString(gmt_offset);
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String id = zonename + offset_string + dst_zonename;
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return id;
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{
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offset_string = Integer.toString(std_offset / 3600);
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int seconds = std_offset % 3600;
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if (seconds != 0)
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{
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if (seconds < 0)
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seconds *= -1;
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if (seconds < 600)
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offset_string
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+= ":0" + Integer.toString(seconds / 60);
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else
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offset_string
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+= ":" + Integer.toString(seconds / 60);
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seconds = seconds % 60;
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if (seconds >= 10)
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offset_string
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+= ":" + Integer.toString(seconds);
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else if (seconds > 0)
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offset_string
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+= ":0" + Integer.toString(seconds);
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}
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if (dst_abbrind >= 0
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&& dst_offset != std_offset - 3600)
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{
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dst_offset_string
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= Integer.toString(dst_offset / 3600);
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seconds = dst_offset % 3600;
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if (seconds != 0)
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{
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if (seconds < 0)
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seconds *= -1;
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if (seconds < 600)
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dst_offset_string
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+= ":0" + Integer.toString(seconds / 60);
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else
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dst_offset_string
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+= ":" + Integer.toString(seconds / 60);
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seconds = seconds % 60;
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||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
// Something didn't match while reading the file.
|
||||
return null;
|
||||
|
||||
return id;
|
||||
}
|
||||
catch (IOException ioe)
|
||||
{
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue