libjava/

	PR libgcj/17002
	PR classpath/28550
	* java/util/VMTimeZone.java (getDefaultTimeZoneId): To read
	/etc/localtime, use ZoneInfo.readTZFile instead of
	VMTimeZone.readtzFile.  Get better timezone name for /etc/localtime,
	either if it is a symlink or through /etc/sysconfig/clock.
	(readSysconfigClockFile): New static method.
	(readtzFile): Removed.
	* java/lang/System.java: Add gnu.java.util.zoneinfo.dir to comments.
	* posix.cc (_Jv_platform_initProperties): Set
	gnu.java.util.zoneinfo.dir.
	* sources.am (gnu_java_util_source_files): Add
	classpath/gnu/java/util/ZoneInfo.java.
	* Makefile.in: Regenerated.
	* java/util/VMTimeZone.h: Regenerated.
	* java/util/TimeZone.h: Regenerated.
	* gnu/java/util/ZoneInfo.h: Generated.
libjava/classpath/
	* java/util/Date.java (parse): Properly parse 09:01:02 as
	hours/minutes/seconds, not as hours/minutes/year.
	* java/util/SimpleTimeZone.java (SimpleTimeZone): Simplify
	{start,end}TimeMode constructor by calling shorter constructor,
	set {start,end}TimeMode fields after it returns.
	(setStartRule): Don't adjust startTime into WALL_TIME.  Set
	startTimeMode to WALL_TIME.
	(endStartRule): Similarly.
	(getOffset): Handle properly millis + dstOffset overflowing into the
	next day.  Adjust startTime resp. endTime based on startTimeMode
	resp. endTimeMode.
	* java/util/TimeZone.java (zoneinfo_dir, availableIDs, aliases0): New
	static fields.
	(timezones): Remove synchronized keyword.  Set zoneinfo_dir.
	If non-null, set up aliases0 and don't put anything into
	timezones0.
	(defaultZone): Call getTimeZone instead of timezones().get.
	(getDefaultTimeZone): Fix parsing of EST5 or EST5EDT6.  Use
	getTimeZoneInternal instead of timezones().get.
	(parseTime): Parse correctly hour:minute.
	(getTimeZoneInternal): New private method.
	(getTimeZone): Do the custom ID checking first, canonicalize
	ID for custom IDs as required by documentation.  Call
	getTimeZoneInternal to handle the rest.
	(getAvailableIDs(int)): Add locking.  Handle zoneinfo_dir != null.
	(getAvailableIDs(File,String,ArrayList)): New private method.
	(getAvailableIDs()): Add locking.  Handle zoneinfo_dir != null.
	* gnu/java/util/ZoneInfo.java: New file.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@122229 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 96 insertions, 479 deletions

diff --git a/libjava/java/lang/System.java b/libjava/java/lang/System.java
index 587e637e974..76a39f0d3f2 100644
--- a/libjava/java/lang/System.java
+++ b/libjava/java/lang/System.java
@@ -1,5 +1,5 @@
 /* System.java -- useful methods to interface with the system
-   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
    Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
@@ -318,6 +318,7 @@ public final class System
    * <dt>gnu.java.io.encoding_scheme_alias.latin?</dt>       <dd>8859_?</dd>
    * <dt>gnu.java.io.encoding_scheme_alias.UTF-8</dt>        <dd>UTF8</dd>
    * <dt>gnu.java.io.encoding_scheme_alias.utf-8</dt>        <dd>UTF8</dd>
+   * <dt>gnu.java.util.zoneinfo.dir</dt>	<dd>Root of zoneinfo tree</dd>
    * </dl>
    *
    * @return the system properties, will never be null
diff --git a/libjava/java/util/TimeZone.h b/libjava/java/util/TimeZone.h
index 3eb30ad5ff5..9ae0ebc3f16 100644
--- a/libjava/java/util/TimeZone.h
+++ b/libjava/java/util/TimeZone.h
@@ -40,8 +40,14 @@ public:
   virtual jboolean useDaylightTime() = 0;
   virtual jboolean inDaylightTime(::java::util::Date *) = 0;
   virtual jint getDSTSavings();
+private:
+  static ::java::util::TimeZone * getTimeZoneInternal(::java::lang::String *);
+public:
   static ::java::util::TimeZone * getTimeZone(::java::lang::String *);
   static JArray< ::java::lang::String * > * getAvailableIDs(jint);
+private:
+  static jint getAvailableIDs(::java::io::File *, ::java::lang::String *, ::java::util::ArrayList *);
+public:
   static JArray< ::java::lang::String * > * getAvailableIDs();
   static ::java::util::TimeZone * getDefault();
   static void setDefault(::java::util::TimeZone *);
@@ -53,6 +59,9 @@ private:
   ::java::lang::String * __attribute__((aligned(__alignof__( ::java::lang::Object)))) ID;
   static ::java::util::TimeZone * defaultZone0;
   static const jlong serialVersionUID = 3581463369166924961LL;
+  static ::java::lang::String * zoneinfo_dir;
+  static JArray< ::java::lang::String * > * availableIDs;
+  static ::java::util::HashMap * aliases0;
   static ::java::util::HashMap * timezones0;
 public:
   static ::java::lang::Class class$;
diff --git a/libjava/java/util/VMTimeZone.h b/libjava/java/util/VMTimeZone.h
index 6e571143dd0..26ca5e224cb 100644
--- a/libjava/java/util/VMTimeZone.h
+++ b/libjava/java/util/VMTimeZone.h
@@ -16,8 +16,7 @@ public: // actually package-private
   static ::java::util::TimeZone * getDefaultTimeZoneId();
 private:
   static ::java::lang::String * readTimeZoneFile(::java::lang::String *);
-  static ::java::lang::String * readtzFile(::java::lang::String *);
-  static void skipFully(::java::io::InputStream *, jlong);
+  static ::java::lang::String * readSysconfigClockFile(::java::lang::String *);
   static ::java::lang::String * getSystemTimeZoneId();
 public:
   static ::java::lang::Class class$;
diff --git a/libjava/java/util/VMTimeZone.java b/libjava/java/util/VMTimeZone.java
index 27bab939166..992ecaf28a8 100644
--- a/libjava/java/util/VMTimeZone.java
+++ b/libjava/java/util/VMTimeZone.java
@@ -40,9 +40,9 @@ exception statement from your version. */
 package java.util;
 
 import gnu.classpath.Configuration;
+import gnu.classpath.SystemProperties;
+import gnu.java.util.ZoneInfo;
 import java.util.TimeZone;
-import java.util.Calendar;
-import java.util.GregorianCalendar;
 
 import java.io.*;
 
@@ -78,9 +78,10 @@ final class VMTimeZone
    * 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>.
+   * <code>ZoneInfo.readTZFile((String)null, "/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>
@@ -111,9 +112,51 @@ final class VMTimeZone
     // Try to parse /etc/localtime
     if (zone == null)
       {
-	tzid = readtzFile("/etc/localtime");
-	if (tzid != null && !tzid.equals(""))
-	  zone = TimeZone.getDefaultTimeZone(tzid);
+	zone = ZoneInfo.readTZFile((String) null, "/etc/localtime");
+	if (zone != null)
+	  {
+	    // Try to find a more suitable ID for the /etc/localtime
+	    // timezone.
+	    // Sometimes /etc/localtime is a symlink to some
+	    // /usr/share/zoneinfo/ file.
+	    String id = null;
+	    try
+	      {
+		id = new File("/etc/localtime").getCanonicalPath();
+		if (id != null)
+		  {
+		    String zoneinfo_dir
+		      = SystemProperties.getProperty("gnu.java.util.zoneinfo.dir");
+		    if (zoneinfo_dir != null)
+		      zoneinfo_dir
+			= new File(zoneinfo_dir
+				   + File.separatorChar).getCanonicalPath();
+		    if (zoneinfo_dir != null && id.startsWith(zoneinfo_dir))
+		      {
+			int pos = zoneinfo_dir.length();
+			while (pos < id.length()
+			       && id.charAt(pos) == File.separatorChar)
+			  pos++;
+			if (pos < id.length())
+			  id = id.substring(pos);
+			else
+			  id = null;
+		      }
+		    else
+		      id = null;
+		  }
+	      }
+	    catch (IOException ioe)
+	      {
+		id = null;
+	      }
+
+	    if (id == null)
+	      id = readSysconfigClockFile("/etc/sysconfig/clock");
+
+	    if (id != null)
+	      zone.setID(id);
+	  }
       }
 
     // Try some system specific way
@@ -189,466 +232,47 @@ final class VMTimeZone
   }
 
   /**
-   * 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.
+   * Tries to read the time zone name from a file.
+   * If the file cannot be read or an IOException occurs 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).
+   * The /etc/sysconfig/clock file is not standard, but a lot of systems
+   * have it. The file is included by shell scripts and the timezone
+   * name is defined in ZONE variable.
+   * This routine should grok it with or without quotes:
+   * ZONE=America/New_York
+   * or
+   * ZONE="Europe/London"
    */
-  private static String readtzFile(String file)
+  private static String readSysconfigClockFile(String file)
   {
-    File f = new File(file);
-    if (!f.exists())
-      return null;
-
-    DataInputStream dis = null;
+    BufferedReader br = null;
     try
       {
-	FileInputStream fis = new FileInputStream(f);
+	FileInputStream fis = new FileInputStream(file);
 	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 = "";
+	br = new BufferedReader(new InputStreamReader(bis));
 
-		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)
+	for (String line = br.readLine(); line != null; line = br.readLine())
 	  {
-	    // Skip over the rest of 64-bit data
-	    skipFully(dis, leapcnt * (8 + 4) + ttisgmtcnt + ttisstdcnt);
-	    if (dis.readByte() == '\n')
+	    line = line.trim();
+	    if (line.length() < 8 || !line.startsWith("ZONE="))
+	      continue;
+	    int posstart = 6;
+	    int posend;
+	    if (line.charAt(5) == '"')
+	      posend = line.indexOf('"', 6);
+	    else if (line.charAt(5) == '\'')
+	      posend = line.indexOf('\'', 6);
+	    else
 	      {
-		String posixtz = dis.readLine();
-		if (posixtz.length() > 0)
-		  id = posixtz;
+		posstart = 5;
+		posend = line.length();
 	      }
+	    if (posend < 0)
+	      return null;
+	    return line.substring(posstart, posend);
 	  }
-
-	return id;
+	return null;
       }
     catch (IOException ioe)
       {
@@ -659,31 +283,15 @@ final class VMTimeZone
       {
 	try
 	  {
-	    if (dis != null)
-	      dis.close();
+	    if (br != null)
+	      br.close();
 	  }
-	catch(IOException ioe)
+	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.