The ZoneInfoFile.java Java example source code
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import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.ref.SoftReference;
import java.nio.file.FileSystems;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import sun.util.calendar.*;
/**
* <code>ZoneInfoFile reads Zone information files in the
* <java.home>/lib/zi directory and provides time zone
* information in the form of a {@link ZoneInfo} object. Also, it
* reads the ZoneInfoMappings file to obtain time zone IDs information
* that is used by the {@link ZoneInfo} class. The directory layout
* and data file formats are as follows.
*
* <p>Directory layout
*
* All zone data files and ZoneInfoMappings are put under the
* <java.home>/lib/zi directory. A path name for a given time
* zone ID is a concatenation of <java.home>/lib/zi/ and the
* time zone ID. (The file separator is replaced with the platform
* dependent value. e.g., '\' for Win32.) An example layout will look
* like as follows.
* <blockquote>
* <pre>
* <java.home>/lib/zi/Africa/Addis_Ababa
* /Africa/Dakar
* /America/Los_Angeles
* /Asia/Singapore
* /EET
* /Europe/Oslo
* /GMT
* /Pacific/Galapagos
* ...
* /ZoneInfoMappings
* </pre>
* </blockquote>
*
* A zone data file has specific information of each zone.
* <code>ZoneInfoMappings has global information of zone IDs so
* that the information can be obtained without instantiating all time
* zones.
*
* <p>File format
*
* Two binary-file formats based on a simple Tag-Length-Value format are used
* to describe TimeZone information. The generic format of a data file is:
* <blockquote>
* <pre>
* DataFile {
* u1 magic[7];
* u1 version;
* data_item data[];
* }
* </pre>
* </blockquote>
* where <code>magic is a magic number identifying a file
* format, <code>version is the format version number, and
* <code>data is one or more data_items. The
* <code>data_item structure is:
* <blockquote>
* <pre>
* data_item {
* u1 tag;
* u2 length;
* u1 value[length];
* }
* </pre>
* </blockquote>
* where <code>tag indicates the data type of the item,
* <code>length is a byte count of the following
* <code>value that is the content of item data.
* <p>
* All data is stored in the big-endian order. There is no boundary
* alignment between date items.
*
* <p>1. ZoneInfo data file
*
* Each ZoneInfo data file consists of the following members.
* <br>
* <blockquote>
* <pre>
* ZoneInfoDataFile {
* u1 magic[7];
* u1 version;
* SET OF<sup>1 {
* transition transitions<sup>2;
* offset_table offsets<sup>2;
* simpletimezone stzparams<sup>2;
* raw_offset rawoffset;
* dstsaving dst;
* checksum crc32;
* gmtoffsetwillchange gmtflag<sup>2;
* }
* }
* 1: an unordered collection of zero or one occurrences of each item
* 2: optional item
* </pre>
* </blockquote>
* <code>magic is a byte-string constant identifying the
* ZoneInfo data file. This field must be <code>"javazi\0"
* defined as {@link #JAVAZI_LABEL}.
* <p>
* <code>version is the version number of the file format. This
* will be used for compatibility check. This field must be
* <code>0x01 in this version.
* <p>
* <code>transition, offset_table and
* <code>simpletimezone have information of time transition
* from the past to the future. Therefore, these structures don't
* exist if the zone didn't change zone names and haven't applied DST in
* the past, and haven't planned to apply it. (e.g. Asia/Tokyo zone)
* <p>
* <code>raw_offset, dstsaving and checksum
* exist in every zoneinfo file. They are used by TimeZone.class indirectly.
*
* <p>1.1 transition structure
* <blockquote>
* <pre>
* transition {
* u1 tag; // 0x04 : constant
* u2 length; // byte length of whole values
* s8 value[length/8]; // transitions in `long'
* }
* </pre>
* </blockquote>
* See {@link ZoneInfo#transitions ZoneInfo.transitions} about the value.
*
* <p>1.2 offset_table structure
* <blockquote>
* <pre>
* offset_table {
* u1 tag; // 0x05 : constant
* u2 length; // byte length of whole values
* s4 value[length/4]; // offset values in `int'
* }
* </pre>
* </blockquote>
*
* <p>1.3 simpletimezone structure
* See {@link ZoneInfo#simpleTimeZoneParams ZoneInfo.simpleTimeZoneParams}
* about the value.
* <blockquote>
* <pre>
* simpletimezone {
* u1 tag; // 0x06 : constant
* u2 length; // byte length of whole values
* s4 value[length/4]; // SimpleTimeZone parameters
* }
* </pre>
* </blockquote>
* See {@link ZoneInfo#offsets ZoneInfo.offsets} about the value.
*
* <p>1.4 raw_offset structure
* <blockquote>
* <pre>
* raw_offset {
* u1 tag; // 0x01 : constant
* u2 length; // must be 4.
* s4 value; // raw GMT offset [millisecond]
* }
* </pre>
* </blockquote>
* See {@link ZoneInfo#rawOffset ZoneInfo.rawOffset} about the value.
*
* <p>1.5 dstsaving structure
* Value has dstSaving in seconds.
* <blockquote>
* <pre>
* dstsaving {
* u1 tag; // 0x02 : constant
* u2 length; // must be 2.
* s2 value; // DST save value [second]
* }
* </pre>
* </blockquote>
* See {@link ZoneInfo#dstSavings ZoneInfo.dstSavings} about value.
*
* <p>1.6 checksum structure
* <blockquote>
* <pre>
* checksum {
* u1 tag; // 0x03 : constant
* u2 length; // must be 4.
* s4 value; // CRC32 value of transitions
* }
* </pre>
* </blockquote>
* See {@link ZoneInfo#checksum ZoneInfo.checksum}.
*
* <p>1.7 gmtoffsetwillchange structure
* This record has a flag value for {@link ZoneInfo#rawOffsetWillChange}.
* If this record is not present in a zoneinfo file, 0 is assumed for
* the value.
* <blockquote>
* <pre>
* gmtoffsetwillchange {
* u1 tag; // 0x07 : constant
* u2 length; // must be 1.
* u1 value; // 1: if the GMT raw offset will change
* // in the future, 0, otherwise.
* }
* </pre>
* </blockquote>
*
*
* <p>2. ZoneInfoMappings file
*
* The ZoneInfoMappings file consists of the following members.
* <br>
* <blockquote>
* <pre>
* ZoneInfoMappings {
* u1 magic[7];
* u1 version;
* SET OF {
* versionName version;
* zone_id_table zoneIDs;
* raw_offset_table rawoffsets;
* raw_offset_index_table rawoffsetindices;
* alias_table aliases;
* excluded_list excludedList;
* }
* }
* </pre>
* </blockquote>
*
* <code>magic is a byte-string constant which has the file type.
* This field must be <code>"javazm\0" defined as {@link #JAVAZM_LABEL}.
* <p>
* <code>version is the version number of this file
* format. This will be used for compatibility check. This field must
* be <code>0x01 in this version.
* <p>
* <code>versionName shows which version of Olson's data has been used
* to generate this ZoneInfoMappings. (e.g. <code>tzdata2000g)
* This field is for trouble-shooting and isn't usually used in runtime.
* <p>
* <code>zone_id_table, raw_offset_index_table and
* <code>alias_table are general information of supported
* zones.
*
* <p>2.1 zone_id_table structure
* The list of zone IDs included in the zi database. The list does
* <em>not include zone IDs, if any, listed in excludedList.
* <br>
* <blockquote>
* <pre>
* zone_id_table {
* u1 tag; // 0x40 : constant
* u2 length; // byte length of whole values
* u2 zone_id_count;
* zone_id value[zone_id_count];
* }
*
* zone_id {
* u1 byte_length; // byte length of id
* u1 id[byte_length]; // zone name string
* }
* </pre>
* </blockquote>
*
* <p>2.2 raw_offset_table structure
* <br>
* <blockquote>
* <pre>
* raw_offset_table {
* u1 tag; // 0x41 : constant
* u2 length; // byte length of whole values
* s4 value[length/4]; // raw GMT offset in milliseconds
* }
* </pre>
* </blockquote>
*
* <p>2.3 raw_offset_index_table structure
* <br>
* <blockquote>
* <pre>
* raw_offset_index_table {
* u1 tag; // 0x42 : constant
* u2 length; // byte length of whole values
* u1 value[length];
* }
* </pre>
* </blockquote>
*
* <p>2.4 alias_table structure
* <br>
* <blockquote>
* <pre>
* alias_table {
* u1 tag; // 0x43 : constant
* u2 length; // byte length of whole values
* u2 nentries; // number of id-pairs
* id_pair value[nentries];
* }
*
* id_pair {
* zone_id aliasname;
* zone_id ID;
* }
* </pre>
* </blockquote>
*
* <p>2.5 versionName structure
* <br>
* <blockquote>
* <pre>
* versionName {
* u1 tag; // 0x44 : constant
* u2 length; // byte length of whole values
* u1 value[length];
* }
* </pre>
* </blockquote>
*
* <p>2.6 excludeList structure
* The list of zone IDs whose zones will change their GMT offsets
* (a.k.a. raw offsets) some time in the future. Those IDs must be
* added to the list of zone IDs for getAvailableIDs(). Also they must
* be examined for getAvailableIDs(int) to determine the
* <em>current GMT offsets.
* <br>
* <blockquote>
* <pre>
* excluded_list {
* u1 tag; // 0x45 : constant
* u2 length; // byte length of whole values
* u2 nentries; // number of zone_ids
* zone_id value[nentries]; // excluded zone IDs
* }
* </pre>
* </blockquote>
*
* @since 1.4
*/
public class ZoneInfoFile {
/**
* The magic number for the ZoneInfo data file format.
*/
public static final byte[] JAVAZI_LABEL = {
(byte)'j', (byte)'a', (byte)'v', (byte)'a', (byte)'z', (byte)'i', (byte)'\0'
};
private static final int JAVAZI_LABEL_LENGTH = JAVAZI_LABEL.length;
/**
* The ZoneInfo data file format version number. Must increase
* one when any incompatible change has been made.
*/
public static final byte JAVAZI_VERSION = 0x01;
/**
* Raw offset data item tag.
*/
public static final byte TAG_RawOffset = 1;
/**
* Known last Daylight Saving Time save value data item tag.
*/
public static final byte TAG_LastDSTSaving = 2;
/**
* Checksum data item tag.
*/
public static final byte TAG_CRC32 = 3;
/**
* Transition data item tag.
*/
public static final byte TAG_Transition = 4;
/**
* Offset table data item tag.
*/
public static final byte TAG_Offset = 5;
/**
* SimpleTimeZone parameters data item tag.
*/
public static final byte TAG_SimpleTimeZone = 6;
/**
* Raw GMT offset will change in the future.
*/
public static final byte TAG_GMTOffsetWillChange = 7;
/**
* The ZoneInfoMappings file name.
*/
public static final String JAVAZM_FILE_NAME = "ZoneInfoMappings";
/**
* The magic number for the ZoneInfoMappings file format.
*/
public static final byte[] JAVAZM_LABEL = {
(byte)'j', (byte)'a', (byte)'v', (byte)'a', (byte)'z', (byte)'m', (byte)'\0'
};
private static final int JAVAZM_LABEL_LENGTH = JAVAZM_LABEL.length;
/**
* The ZoneInfoMappings file format version number. Must increase
* one when any incompatible change has been made.
*/
public static final byte JAVAZM_VERSION = 0x01;
/**
* Time zone IDs data item tag.
*/
public static final byte TAG_ZoneIDs = 64;
/**
* Raw GMT offsets table data item tag.
*/
public static final byte TAG_RawOffsets = 65;
/**
* Indices to the raw GMT offset table data item tag.
*/
public static final byte TAG_RawOffsetIndices = 66;
/**
* Time zone aliases table data item tag.
*/
public static final byte TAG_ZoneAliases = 67;
/**
* Olson's public zone information version tag.
*/
public static final byte TAG_TZDataVersion = 68;
/**
* Excluded zones item tag. (Added in Mustang)
*/
public static final byte TAG_ExcludedZones = 69;
private static Map<String, ZoneInfoOld> zoneInfoObjects = null;
private static final ZoneInfoOld GMT = new ZoneInfoOld("GMT", 0);
static String ziDir;
/**
* Converts the given time zone ID to a platform dependent path
* name. For example, "America/Los_Angeles" is converted to
* "America\Los_Angeles" on Win32.
* @return a modified ID replacing '/' with {@link
* java.io.File#separatorChar File.separatorChar} if needed.
*/
public static String getFileName(String ID) {
if (File.separatorChar == '/') {
return ID;
}
return ID.replace('/', File.separatorChar);
}
/**
* Gets a ZoneInfo with the given GMT offset. The object
* has its ID in the format of GMT{+|-}hh:mm.
*
* @param originalId the given custom id (before normalized such as "GMT+9")
* @param gmtOffset GMT offset <em>in milliseconds
* @return a ZoneInfo constructed with the given GMT offset
*/
public static ZoneInfoOld getCustomTimeZone(String originalId, int gmtOffset) {
String id = toCustomID(gmtOffset);
ZoneInfoOld zi = getFromCache(id);
if (zi == null) {
zi = new ZoneInfoOld(id, gmtOffset);
zi = addToCache(id, zi);
if (!id.equals(originalId)) {
zi = addToCache(originalId, zi);
}
}
return (ZoneInfoOld) zi.clone();
}
public static String toCustomID(int gmtOffset) {
char sign;
int offset = gmtOffset / 60000;
if (offset >= 0) {
sign = '+';
} else {
sign = '-';
offset = -offset;
}
int hh = offset / 60;
int mm = offset % 60;
char[] buf = new char[] { 'G', 'M', 'T', sign, '0', '0', ':', '0', '0' };
if (hh >= 10) {
buf[4] += hh / 10;
}
buf[5] += hh % 10;
if (mm != 0) {
buf[7] += mm / 10;
buf[8] += mm % 10;
}
return new String(buf);
}
/**
* @return a ZoneInfo instance created for the specified id, or
* null if there is no time zone data file found for the specified
* id.
*/
public static ZoneInfoOld getZoneInfoOld(String id) {
//treat GMT zone as special
if ("GMT".equals(id))
return (ZoneInfoOld) GMT.clone();
ZoneInfoOld zi = getFromCache(id);
if (zi == null) {
Map<String, String> aliases = ZoneInfoOld.getCachedAliasTable();
if (aliases != null && aliases.get(id) != null) {
return null;
}
zi = createZoneInfoOld(id);
if (zi == null) {
return null;
}
zi = addToCache(id, zi);
}
return (ZoneInfoOld) zi.clone();
}
synchronized static ZoneInfoOld getFromCache(String id) {
if (zoneInfoObjects == null) {
return null;
}
return zoneInfoObjects.get(id);
}
synchronized static ZoneInfoOld addToCache(String id, ZoneInfoOld zi) {
if (zoneInfoObjects == null) {
zoneInfoObjects = new HashMap<>();
} else {
ZoneInfoOld zone = zoneInfoObjects.get(id);
if (zone != null) {
return zone;
}
}
zoneInfoObjects.put(id, zi);
return zi;
}
private static ZoneInfoOld createZoneInfoOld(String id) {
byte[] buf = readZoneInfoFile(getFileName(id));
if (buf == null) {
return null;
}
int index = 0;
int filesize = buf.length;
int rawOffset = 0;
int dstSavings = 0;
int checksum = 0;
boolean willGMTOffsetChange = false;
long[] transitions = null;
int[] offsets = null;
int[] simpleTimeZoneParams = null;
try {
for (index = 0; index < JAVAZI_LABEL.length; index++) {
if (buf[index] != JAVAZI_LABEL[index]) {
System.err.println("ZoneInfoOld: wrong magic number: " + id);
return null;
}
}
if (buf[index++] > JAVAZI_VERSION) {
System.err.println("ZoneInfo: incompatible version ("
+ buf[index - 1] + "): " + id);
return null;
}
while (index < filesize) {
byte tag = buf[index++];
int len = ((buf[index++] & 0xFF) << 8) + (buf[index++] & 0xFF);
if (filesize < index+len) {
break;
}
switch (tag) {
case TAG_CRC32:
{
int val = buf[index++] & 0xff;
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
checksum = val;
}
break;
case TAG_LastDSTSaving:
{
short val = (short)(buf[index++] & 0xff);
val = (short)((val << 8) + (buf[index++] & 0xff));
dstSavings = val * 1000;
}
break;
case TAG_RawOffset:
{
int val = buf[index++] & 0xff;
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
rawOffset = val;
}
break;
case TAG_Transition:
{
int n = len / 8;
transitions = new long[n];
for (int i = 0; i < n; i ++) {
long val = buf[index++] & 0xff;
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
transitions[i] = val;
}
}
break;
case TAG_Offset:
{
int n = len / 4;
offsets = new int[n];
for (int i = 0; i < n; i ++) {
int val = buf[index++] & 0xff;
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
offsets[i] = val;
}
}
break;
case TAG_SimpleTimeZone:
{
if (len != 32 && len != 40) {
System.err.println("ZoneInfo: wrong SimpleTimeZone parameter size");
return null;
}
int n = len / 4;
simpleTimeZoneParams = new int[n];
for (int i = 0; i < n; i++) {
int val = buf[index++] & 0xff;
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
simpleTimeZoneParams[i] = val;
}
}
break;
case TAG_GMTOffsetWillChange:
{
if (len != 1) {
System.err.println("ZoneInfo: wrong byte length for TAG_GMTOffsetWillChange");
}
willGMTOffsetChange = buf[index++] == 1;
}
break;
default:
System.err.println("ZoneInfo: unknown tag < " + tag + ">. ignored.");
index += len;
break;
}
}
} catch (Exception e) {
System.err.println("ZoneInfo: corrupted zoneinfo file: " + id);
return null;
}
if (index != filesize) {
System.err.println("ZoneInfo: wrong file size: " + id);
return null;
}
return new ZoneInfoOld(id, rawOffset, dstSavings, checksum,
transitions, offsets, simpleTimeZoneParams,
willGMTOffsetChange);
}
private volatile static SoftReference<List zoneIDs = null;
static List<String> getZoneIDs() {
List<String> ids = null;
SoftReference<List cache = zoneIDs;
if (cache != null) {
ids = cache.get();
if (ids != null) {
return ids;
}
}
byte[] buf = null;
buf = getZoneInfoOldMappings();
int index = JAVAZM_LABEL_LENGTH + 1;
int filesize = buf.length;
try {
loop:
while (index < filesize) {
byte tag = buf[index++];
int len = ((buf[index++] & 0xFF) << 8) + (buf[index++] & 0xFF);
switch (tag) {
case TAG_ZoneIDs:
{
int n = (buf[index++] << 8) + (buf[index++] & 0xFF);
ids = new ArrayList<>(n);
for (int i = 0; i < n; i++) {
byte m = buf[index++];
ids.add(new String(buf, index, m, "UTF-8"));
index += m;
}
}
break loop;
default:
index += len;
break;
}
}
} catch (Exception e) {
System.err.println("ZoneInfoOld: corrupted " + JAVAZM_FILE_NAME);
}
zoneIDs = new SoftReference<>(ids);
return ids;
}
/**
* @return an alias table in HashMap where a key is an alias ID
* (e.g., "PST") and its value is a real time zone ID (e.g.,
* "America/Los_Angeles").
*/
static Map<String, String> getZoneAliases() {
byte[] buf = getZoneInfoOldMappings();
int index = JAVAZM_LABEL_LENGTH + 1;
int filesize = buf.length;
Map<String, String> aliases = null;
try {
loop:
while (index < filesize) {
byte tag = buf[index++];
int len = ((buf[index++] & 0xFF) << 8) + (buf[index++] & 0xFF);
switch (tag) {
case TAG_ZoneAliases:
{
int n = (buf[index++] << 8) + (buf[index++] & 0xFF);
aliases = new HashMap<>(n);
for (int i = 0; i < n; i++) {
byte m = buf[index++];
String name = new String(buf, index, m, "UTF-8");
index += m;
m = buf[index++];
String realName = new String(buf, index, m, "UTF-8");
index += m;
aliases.put(name, realName);
}
}
break loop;
default:
index += len;
break;
}
}
} catch (Exception e) {
System.err.println("ZoneInfoOld: corrupted " + JAVAZM_FILE_NAME);
return null;
}
return aliases;
}
private volatile static SoftReference<List excludedIDs = null;
private volatile static boolean hasNoExcludeList = false;
/**
* @return a List of zone IDs for zones that will change their GMT
* offsets in some future time.
*
* @since 1.6
*/
static List<String> getExcludedZones() {
if (hasNoExcludeList) {
return null;
}
List<String> excludeList = null;
SoftReference<List cache = excludedIDs;
if (cache != null) {
excludeList = cache.get();
if (excludeList != null) {
return excludeList;
}
}
byte[] buf = getZoneInfoOldMappings();
int index = JAVAZM_LABEL_LENGTH + 1;
int filesize = buf.length;
try {
loop:
while (index < filesize) {
byte tag = buf[index++];
int len = ((buf[index++] & 0xFF) << 8) + (buf[index++] & 0xFF);
switch (tag) {
case TAG_ExcludedZones:
{
int n = (buf[index++] << 8) + (buf[index++] & 0xFF);
excludeList = new ArrayList<>();
for (int i = 0; i < n; i++) {
byte m = buf[index++];
String name = new String(buf, index, m, "UTF-8");
index += m;
excludeList.add(name);
}
}
break loop;
default:
index += len;
break;
}
}
} catch (Exception e) {
System.err.println("ZoneInfoOld: corrupted " + JAVAZM_FILE_NAME);
return null;
}
if (excludeList != null) {
excludedIDs = new SoftReference<>(excludeList);
} else {
hasNoExcludeList = true;
}
return excludeList;
}
private volatile static SoftReference<byte[]> rawOffsetIndices = null;
static byte[] getRawOffsetIndices() {
byte[] indices = null;
SoftReference<byte[]> cache = rawOffsetIndices;
if (cache != null) {
indices = cache.get();
if (indices != null) {
return indices;
}
}
byte[] buf = getZoneInfoOldMappings();
int index = JAVAZM_LABEL_LENGTH + 1;
int filesize = buf.length;
try {
loop:
while (index < filesize) {
byte tag = buf[index++];
int len = ((buf[index++] & 0xFF) << 8) + (buf[index++] & 0xFF);
switch (tag) {
case TAG_RawOffsetIndices:
{
indices = new byte[len];
for (int i = 0; i < len; i++) {
indices[i] = buf[index++];
}
}
break loop;
default:
index += len;
break;
}
}
} catch (ArrayIndexOutOfBoundsException e) {
System.err.println("ZoneInfoOld: corrupted " + JAVAZM_FILE_NAME);
}
rawOffsetIndices = new SoftReference<>(indices);
return indices;
}
private volatile static SoftReference<int[]> rawOffsets = null;
static int[] getRawOffsets() {
int[] offsets = null;
SoftReference<int[]> cache = rawOffsets;
if (cache != null) {
offsets = cache.get();
if (offsets != null) {
return offsets;
}
}
byte[] buf = getZoneInfoOldMappings();
int index = JAVAZM_LABEL_LENGTH + 1;
int filesize = buf.length;
try {
loop:
while (index < filesize) {
byte tag = buf[index++];
int len = ((buf[index++] & 0xFF) << 8) + (buf[index++] & 0xFF);
switch (tag) {
case TAG_RawOffsets:
{
int n = len/4;
offsets = new int[n];
for (int i = 0; i < n; i++) {
int val = buf[index++] & 0xff;
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
val = (val << 8) + (buf[index++] & 0xff);
offsets[i] = val;
}
}
break loop;
default:
index += len;
break;
}
}
} catch (ArrayIndexOutOfBoundsException e) {
System.err.println("ZoneInfoOld: corrupted " + JAVAZM_FILE_NAME);
}
rawOffsets = new SoftReference<>(offsets);
return offsets;
}
private volatile static SoftReference<byte[]> zoneInfoMappings = null;
private static byte[] getZoneInfoOldMappings() {
byte[] data;
SoftReference<byte[]> cache = zoneInfoMappings;
if (cache != null) {
data = cache.get();
if (data != null) {
return data;
}
}
data = readZoneInfoFile(JAVAZM_FILE_NAME);
if (data == null) {
throw new RuntimeException("ZoneInfoOldMapping " +
JAVAZM_FILE_NAME + " either doesn't exist or doesn't have data");
}
int index;
for (index = 0; index < JAVAZM_LABEL.length; index++) {
if (data[index] != JAVAZM_LABEL[index]) {
System.err.println("ZoneInfoOld: wrong magic number: " + JAVAZM_FILE_NAME);
return null;
}
}
if (data[index++] > JAVAZM_VERSION) {
System.err.println("ZoneInfoOld: incompatible version ("
+ data[index - 1] + "): " + JAVAZM_FILE_NAME);
return null;
}
zoneInfoMappings = new SoftReference<>(data);
return data;
}
/**
* Reads the specified file under <java.home>/lib/zi into a buffer.
* @return the buffer, or null if any I/O error occurred.
*/
private static byte[] readZoneInfoFile(final String fileName) {
if (fileName.indexOf("..") >= 0) {
return null;
}
byte[] buffer = null;
File file = new File(ziDir, fileName);
try {
int filesize = (int)file.length();
if (filesize > 0) {
FileInputStream fis = new FileInputStream(file);
buffer = new byte[filesize];
try {
if (fis.read(buffer) != filesize) {
throw new IOException("read error on " + fileName);
}
} finally {
fis.close();
}
}
} catch (Exception ex) {
if (!(ex instanceof FileNotFoundException) || JAVAZM_FILE_NAME.equals(fileName)) {
System.err.println("ZoneInfoOld: " + ex.getMessage());
}
}
return buffer;
}
private ZoneInfoFile() {
}
}
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