| /* | |
| * Copyright (c) 2012, 2025, Oracle and/or its affiliates. All rights reserved. | |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| * | |
| * This code is free software; you can redistribute it and/or modify it | |
| * under the terms of the GNU General Public License version 2 only, as | |
| * published by the Free Software Foundation. Oracle designates this | |
| * particular file as subject to the "Classpath" exception as provided | |
| * by Oracle in the LICENSE file that accompanied this code. | |
| * | |
| * This code is distributed in the hope that it will be useful, but WITHOUT | |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| * version 2 for more details (a copy is included in the LICENSE file that | |
| * accompanied this code). | |
| * | |
| * You should have received a copy of the GNU General Public License version | |
| * 2 along with this work; if not, write to the Free Software Foundation, | |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| * | |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| * or visit www.oracle.com if you need additional information or have any | |
| * questions. | |
| */ | |
| package sun.util.calendar; | |
| import java.io.ByteArrayInputStream; | |
| import java.io.BufferedInputStream; | |
| import java.io.DataInput; | |
| import java.io.DataInputStream; | |
| import java.io.File; | |
| import java.io.FileInputStream; | |
| import java.io.IOException; | |
| import java.io.StreamCorruptedException; | |
| import java.time.LocalDateTime; | |
| import java.time.ZoneId; | |
| import java.time.ZoneOffset; | |
| import java.util.ArrayList; | |
| import java.util.Arrays; | |
| import java.util.Calendar; | |
| import java.util.Collections; | |
| import java.util.HashMap; | |
| import java.util.List; | |
| import java.util.Map; | |
| import java.util.SimpleTimeZone; | |
| import java.util.concurrent.ConcurrentHashMap; | |
| import java.util.stream.Stream; | |
| import java.util.zip.CRC32; | |
| import jdk.internal.util.StaticProperty; | |
| /** | |
| * Loads TZDB time-zone rules for j.u.TimeZone | |
| * <p> | |
| * @since 1.8 | |
| */ | |
| public final class ZoneInfoFile { | |
| /** | |
| * Gets all available IDs supported in the Java run-time. | |
| * | |
| * @return an array of time zone IDs. | |
| */ | |
| public static String[] getZoneIds() { | |
| var shortIDs = ZoneId.SHORT_IDS.keySet(); | |
| int len = regions.length + shortIDs.size(); | |
| String[] ids = Arrays.copyOf(regions, len); | |
| int i = regions.length; | |
| for (var id : shortIDs) { | |
| ids[i++] = id; | |
| } | |
| return ids; | |
| } | |
| /** | |
| * Gets all available IDs that have the same value as the | |
| * specified raw GMT offset. | |
| * | |
| * @param rawOffset the GMT offset in milliseconds. This | |
| * value should not include any daylight saving time. | |
| * @return an array of time zone IDs. | |
| */ | |
| public static String[] getZoneIds(int rawOffset) { | |
| List<String> ids = new ArrayList<>(); | |
| for (String id : getZoneIds()) { | |
| ZoneInfo zi = getZoneInfo(id); | |
| if (zi.getRawOffset() == rawOffset) { | |
| ids.add(id); | |
| } | |
| } | |
| // It appears the "zi" implementation returns the | |
| // sorted list, though the specification does not | |
| // specify it. Keep the same behavior for better | |
| // compatibility. | |
| String[] list = ids.toArray(new String[0]); | |
| Arrays.sort(list); | |
| return list; | |
| } | |
| /** | |
| * Gets all available IDs supported in the Java run-time. | |
| * | |
| * @return a stream of time zone IDs. | |
| */ | |
| public static Stream<String> zoneIds() { | |
| return Stream.concat(Arrays.stream(regions), | |
| ZoneId.SHORT_IDS.keySet().stream()); | |
| } | |
| /** | |
| * Gets all available IDs that have the same value as the | |
| * specified raw GMT offset. | |
| * | |
| * @param rawOffset the GMT offset in milliseconds. This | |
| * value should not include any daylight saving time. | |
| * @return a stream of time zone IDs. | |
| */ | |
| public static Stream<String> zoneIds(int rawOffset) { | |
| return zoneIds() | |
| .filter(id -> getZoneInfo(id).getRawOffset() == rawOffset) | |
| .sorted(); // Sort the IDs, see getZoneIds(int) | |
| } | |
| public static ZoneInfo getZoneInfo(String zoneId) { | |
| if (zoneId == null) { | |
| return null; | |
| } | |
| ZoneInfo zi = getZoneInfo0(zoneId); | |
| if (zi != null) { | |
| zi = (ZoneInfo)zi.clone(); | |
| zi.setID(zoneId); | |
| } | |
| return zi; | |
| } | |
| private static ZoneInfo getZoneInfo0(String zoneId) { | |
| try { | |
| ZoneInfo zi = zones.get(zoneId); | |
| if (zi != null) { | |
| return zi; | |
| } | |
| String zid = aliases.getOrDefault(zoneId, zoneId); | |
| int index = Arrays.binarySearch(regions, zid); | |
| if (index < 0) { | |
| return null; | |
| } | |
| byte[] bytes = ruleArray[indices[index]]; | |
| DataInputStream dis = new DataInputStream(new ByteArrayInputStream(bytes)); | |
| zi = getZoneInfo(dis, zid); | |
| zones.put(zoneId, zi); | |
| return zi; | |
| } catch (Exception ex) { | |
| throw new RuntimeException("Invalid binary time-zone data: TZDB:" + | |
| zoneId + ", version: " + versionId, ex); | |
| } | |
| } | |
| /** | |
| * Returns a Map from alias time zone IDs to their standard | |
| * time zone IDs. | |
| * | |
| * @return an unmodified alias mapping | |
| */ | |
| public static Map<String, String> getAliasMap() { | |
| return Collections.unmodifiableMap(aliases); | |
| } | |
| /** | |
| * Gets the version of this tz data. | |
| * | |
| * @return the tzdb version | |
| */ | |
| public static String getVersion() { | |
| return versionId; | |
| } | |
| /** | |
| * 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</em> | |
| * @return a ZoneInfo constructed with the given GMT offset | |
| */ | |
| public static ZoneInfo getCustomTimeZone(String originalId, int gmtOffset) { | |
| String id = toCustomID(gmtOffset); | |
| return new ZoneInfo(id, gmtOffset); | |
| } | |
| public static String toCustomID(int gmtOffset) { | |
| char sign; | |
| int offset = gmtOffset / 1_000; | |
| if (offset >= 0) { | |
| sign = '+'; | |
| } else { | |
| sign = '-'; | |
| offset = -offset; | |
| } | |
| int hh = offset / 3_600; | |
| int mm = (offset % 3_600) / 60; | |
| int ss = offset % 60; | |
| char[] buf = new char[] { 'G', 'M', 'T', sign, '0', '0', ':', '0', '0' }; | |
| if (hh >= 10) { | |
| buf[4] += (char)(hh / 10); | |
| } | |
| buf[5] += (char)(hh % 10); | |
| if (mm != 0) { | |
| buf[7] += (char)(mm / 10); | |
| buf[8] += (char)(mm % 10); | |
| } | |
| var id = new String(buf); | |
| if (ss != 0) { | |
| buf[7] = (char)('0' + ss / 10); | |
| buf[8] = (char)('0' + ss % 10); | |
| id += new String(buf, 6, 3); | |
| } | |
| return id; | |
| } | |
| /////////////////////////////////////////////////////////// | |
| private ZoneInfoFile() { | |
| } | |
| private static String versionId; | |
| private static final Map<String, ZoneInfo> zones = new ConcurrentHashMap<>(); | |
| private static final Map<String, String> aliases = new HashMap<>(); | |
| private static byte[][] ruleArray; | |
| private static String[] regions; | |
| private static int[] indices; | |
| static { | |
| loadTZDB(); | |
| } | |
| private static void loadTZDB() { | |
| try { | |
| String libDir = StaticProperty.javaHome() + File.separator + "lib"; | |
| try (DataInputStream dis = new DataInputStream( | |
| new BufferedInputStream(new FileInputStream( | |
| new File(libDir, "tzdb.dat"))))) { | |
| load(dis); | |
| } | |
| } catch (Exception x) { | |
| throw new Error(x); | |
| } | |
| } | |
| /** | |
| * Loads the rules from a DateInputStream | |
| * | |
| * @param dis the DateInputStream to load, not null | |
| * @throws IOException if an error occurs | |
| */ | |
| private static void load(DataInputStream dis) throws IOException { | |
| if (dis.readByte() != 1) { | |
| throw new StreamCorruptedException("File format not recognised"); | |
| } | |
| // group | |
| String groupId = dis.readUTF(); | |
| if ("TZDB".equals(groupId) == false) { | |
| throw new StreamCorruptedException("File format not recognised"); | |
| } | |
| // versions, only keep the last one | |
| int versionCount = dis.readShort(); | |
| for (int i = 0; i < versionCount; i++) { | |
| versionId = dis.readUTF(); | |
| } | |
| // regions | |
| int regionCount = dis.readShort(); | |
| String[] regionArray = new String[regionCount]; | |
| for (int i = 0; i < regionCount; i++) { | |
| regionArray[i] = dis.readUTF(); | |
| } | |
| // rules | |
| int ruleCount = dis.readShort(); | |
| ruleArray = new byte[ruleCount][]; | |
| for (int i = 0; i < ruleCount; i++) { | |
| byte[] bytes = new byte[dis.readShort()]; | |
| dis.readFully(bytes); | |
| ruleArray[i] = bytes; | |
| } | |
| // link version-region-rules, only keep the last version, if more than one | |
| for (int i = 0; i < versionCount; i++) { | |
| regionCount = dis.readShort(); | |
| regions = new String[regionCount]; | |
| indices = new int[regionCount]; | |
| for (int j = 0; j < regionCount; j++) { | |
| regions[j] = regionArray[dis.readShort()]; | |
| indices[j] = dis.readShort(); | |
| } | |
| } | |
| // remove the following ids from the map, they | |
| // are excluded from the "old" ZoneInfo | |
| zones.remove("ROC"); | |
| for (int i = 0; i < versionCount; i++) { | |
| int aliasCount = dis.readShort(); | |
| aliases.clear(); | |
| for (int j = 0; j < aliasCount; j++) { | |
| String alias = regionArray[dis.readShort()]; | |
| String region = regionArray[dis.readShort()]; | |
| aliases.put(alias, region); | |
| } | |
| } | |
| // old us time-zone names | |
| aliases.putAll(ZoneId.SHORT_IDS); | |
| } | |
| /////////////////////////Ser///////////////////////////////// | |
| public static ZoneInfo getZoneInfo(DataInput in, String zoneId) throws Exception { | |
| byte type = in.readByte(); | |
| // TBD: assert ZRULES: | |
| int stdSize = in.readInt(); | |
| long[] stdTrans = new long[stdSize]; | |
| for (int i = 0; i < stdSize; i++) { | |
| stdTrans[i] = readEpochSec(in); | |
| } | |
| int [] stdOffsets = new int[stdSize + 1]; | |
| for (int i = 0; i < stdOffsets.length; i++) { | |
| stdOffsets[i] = readOffset(in); | |
| } | |
| int savSize = in.readInt(); | |
| long[] savTrans = new long[savSize]; | |
| for (int i = 0; i < savSize; i++) { | |
| savTrans[i] = readEpochSec(in); | |
| } | |
| int[] savOffsets = new int[savSize + 1]; | |
| for (int i = 0; i < savOffsets.length; i++) { | |
| savOffsets[i] = readOffset(in); | |
| } | |
| int ruleSize = in.readByte(); | |
| ZoneOffsetTransitionRule[] rules = new ZoneOffsetTransitionRule[ruleSize]; | |
| for (int i = 0; i < ruleSize; i++) { | |
| rules[i] = new ZoneOffsetTransitionRule(in); | |
| } | |
| return getZoneInfo(zoneId, stdTrans, stdOffsets, savTrans, savOffsets, rules); | |
| } | |
| public static int readOffset(DataInput in) throws IOException { | |
| int offsetByte = in.readByte(); | |
| return offsetByte == 127 ? in.readInt() : offsetByte * 900; | |
| } | |
| static long readEpochSec(DataInput in) throws IOException { | |
| int hiByte = in.readByte() & 255; | |
| if (hiByte == 255) { | |
| return in.readLong(); | |
| } else { | |
| int midByte = in.readByte() & 255; | |
| int loByte = in.readByte() & 255; | |
| long tot = ((hiByte << 16) + (midByte << 8) + loByte); | |
| return (tot * 900) - 4575744000L; | |
| } | |
| } | |
| /////////////////////////ZoneRules --> ZoneInfo///////////////////////////////// | |
| // ZoneInfo starts with UTC1900 | |
| private static final long UTC1900 = -2208988800L; | |
| // ZoneInfo ends with UTC2100 | |
| // LocalDateTime.of(2101, 1, 1, 0, 0, 0).toEpochSecond(ZoneOffset.UTC) - 1; | |
| private static final long UTC2100 = 4133980799L; | |
| // ZoneInfo has an ending entry for 2100, this need to be offset by | |
| // a "rawOffset" | |
| // LocalDateTime.of(2100, 1, 1, 0, 0, 0).toEpochSecond(ZoneOffset.UTC); | |
| private static final long LDT2100 = 4102444800L; | |
| //Current time. Used to determine future GMT offset transitions | |
| private static final long CURRT = System.currentTimeMillis()/1000; | |
| /** | |
| * Get a ZoneInfo instance. | |
| * | |
| * @param standardTransitions the standard transitions, not null | |
| * @param standardOffsets the standard offsets, not null | |
| * @param savingsInstantTransitions the standard transitions, not null | |
| * @param wallOffsets the wall offsets, not null | |
| * @param lastRules the recurring last rules, size 15 or less, not null | |
| */ | |
| private static ZoneInfo getZoneInfo(String zoneId, | |
| long[] standardTransitions, | |
| int[] standardOffsets, | |
| long[] savingsInstantTransitions, | |
| int[] wallOffsets, | |
| ZoneOffsetTransitionRule[] lastRules) { | |
| int rawOffset = 0; | |
| int dstSavings = 0; | |
| int checksum = 0; | |
| int[] params = null; | |
| boolean willGMTOffsetChange = false; | |
| // rawOffset, pick the last one | |
| if (standardTransitions.length > 0) { | |
| rawOffset = standardOffsets[standardOffsets.length - 1] * 1000; | |
| willGMTOffsetChange = standardTransitions[standardTransitions.length - 1] > CURRT; | |
| } | |
| else | |
| rawOffset = standardOffsets[0] * 1000; | |
| // transitions, offsets; | |
| long[] transitions = null; | |
| int[] offsets = null; | |
| int nOffsets = 0; | |
| int nTrans = 0; | |
| if (savingsInstantTransitions.length != 0) { | |
| transitions = new long[250]; | |
| offsets = new int[100]; // TBD: ZoneInfo actually can't handle | |
| // offsets.length > 16 (4-bit index limit) | |
| // last year in trans table | |
| // It should not matter to use before or after offset for year | |
| int lastyear = getYear(savingsInstantTransitions[savingsInstantTransitions.length - 1], | |
| wallOffsets[savingsInstantTransitions.length - 1]); | |
| int i = 0, k = 1; | |
| while (i < savingsInstantTransitions.length && | |
| savingsInstantTransitions[i] < UTC1900) { | |
| i++; // skip any date before UTC1900 | |
| } | |
| if (i < savingsInstantTransitions.length) { | |
| // javazic writes the last GMT offset into index 0! | |
| offsets[0] = standardOffsets[standardOffsets.length - 1] * 1000; | |
| nOffsets = 1; | |
| // ZoneInfo has a beginning entry for 1900. | |
| // Only add it if this is not the only one in table | |
| nOffsets = addTrans(transitions, nTrans++, | |
| offsets, nOffsets, | |
| UTC1900, | |
| wallOffsets[i], | |
| getStandardOffset(standardTransitions, standardOffsets, UTC1900)); | |
| } | |
| for (; i < savingsInstantTransitions.length; i++) { | |
| long trans = savingsInstantTransitions[i]; | |
| if (trans > UTC2100) { | |
| // no trans beyond LASTYEAR | |
| lastyear = LASTYEAR; | |
| break; | |
| } | |
| while (k < standardTransitions.length) { | |
| // some standard offset transitions don't exist in | |
| // savingInstantTrans, if the offset "change" doesn't | |
| // really change the "effectiveWallOffset". For example | |
| // the 1999/2000 pair in Zone Arg/Buenos_Aires, in which | |
| // the daylightsaving "happened" but it actually does | |
| // not result in the timezone switch. ZoneInfo however | |
| // needs them in its transitions table | |
| long trans_s = standardTransitions[k]; | |
| if (trans_s >= UTC1900) { | |
| if (trans_s > trans) | |
| break; | |
| if (trans_s < trans) { | |
| if (nOffsets + 2 >= offsets.length) { | |
| offsets = Arrays.copyOf(offsets, offsets.length + 100); | |
| } | |
| if (nTrans + 1 >= transitions.length) { | |
| transitions = Arrays.copyOf(transitions, transitions.length + 100); | |
| } | |
| nOffsets = addTrans(transitions, nTrans++, offsets, nOffsets, | |
| trans_s, | |
| wallOffsets[i], | |
| standardOffsets[k+1]); | |
| } | |
| } | |
| k++; | |
| } | |
| if (nOffsets + 2 >= offsets.length) { | |
| offsets = Arrays.copyOf(offsets, offsets.length + 100); | |
| } | |
| if (nTrans + 1 >= transitions.length) { | |
| transitions = Arrays.copyOf(transitions, transitions.length + 100); | |
| } | |
| nOffsets = addTrans(transitions, nTrans++, offsets, nOffsets, | |
| trans, | |
| wallOffsets[i + 1], | |
| getStandardOffset(standardTransitions, standardOffsets, trans)); | |
| } | |
| // append any leftover standard trans | |
| while (k < standardTransitions.length) { | |
| long trans = standardTransitions[k]; | |
| if (trans >= UTC1900) { | |
| int offset = wallOffsets[i]; | |
| int offsetIndex = indexOf(offsets, 0, nOffsets, offset); | |
| if (offsetIndex == nOffsets) | |
| nOffsets++; | |
| transitions[nTrans++] = ((trans * 1000) << TRANSITION_NSHIFT) | | |
| (offsetIndex & OFFSET_MASK); | |
| } | |
| k++; | |
| } | |
| if (lastRules.length > 1) { | |
| // fill the gap between the last trans until LASTYEAR | |
| while (lastyear++ < LASTYEAR) { | |
| for (ZoneOffsetTransitionRule zotr : lastRules) { | |
| long trans = zotr.getTransitionEpochSecond(lastyear); | |
| if (nOffsets + 2 >= offsets.length) { | |
| offsets = Arrays.copyOf(offsets, offsets.length + 100); | |
| } | |
| if (nTrans + 1 >= transitions.length) { | |
| transitions = Arrays.copyOf(transitions, transitions.length + 100); | |
| } | |
| nOffsets = addTrans(transitions, nTrans++, | |
| offsets, nOffsets, | |
| trans, | |
| zotr.offsetAfter, | |
| zotr.standardOffset); | |
| } | |
| } | |
| ZoneOffsetTransitionRule startRule = lastRules[lastRules.length - 2]; | |
| ZoneOffsetTransitionRule endRule = lastRules[lastRules.length - 1]; | |
| params = new int[10]; | |
| if (startRule.offsetAfter - startRule.offsetBefore < 0 && | |
| endRule.offsetAfter - endRule.offsetBefore > 0) { | |
| ZoneOffsetTransitionRule tmp; | |
| tmp = startRule; | |
| startRule = endRule; | |
| endRule = tmp; | |
| } | |
| params[0] = startRule.month - 1; | |
| int dom = startRule.dom; | |
| int dow = startRule.dow; | |
| if (dow == -1) { | |
| params[1] = dom; | |
| params[2] = 0; | |
| } else { | |
| // ZoneRulesBuilder adjusts < 0 case (-1, for last, don't have | |
| // "<=" case yet) to positive value if not February (it appears | |
| // we don't have February cutoff in tzdata table yet) | |
| // Ideally, if JSR310 can just pass in the negative and | |
| // we can then pass in the dom = -1, dow > 0 into ZoneInfo | |
| // | |
| // hacking, assume the >=24 is the result of ZRB optimization for | |
| // "last", it works for now. | |
| if (dom < 0 || dom >= 24) { | |
| params[1] = -1; | |
| params[2] = toCalendarDOW[dow]; | |
| } else { | |
| params[1] = dom; | |
| // To specify a day of week on or after an exact day of month, | |
| // set the month to an exact month value, day-of-month to the | |
| // day on or after which the rule is applied, and day-of-week | |
| // to a negative Calendar.DAY_OF_WEEK DAY_OF_WEEK field value. | |
| params[2] = -toCalendarDOW[dow]; | |
| } | |
| } | |
| params[3] = startRule.secondOfDay * 1000; | |
| params[4] = toSTZTime[startRule.timeDefinition]; | |
| params[5] = endRule.month - 1; | |
| dom = endRule.dom; | |
| dow = endRule.dow; | |
| if (dow == -1) { | |
| params[6] = dom; | |
| params[7] = 0; | |
| } else { | |
| // hacking: see comment above | |
| if (dom < 0 || dom >= 24) { | |
| params[6] = -1; | |
| params[7] = toCalendarDOW[dow]; | |
| } else { | |
| params[6] = dom; | |
| params[7] = -toCalendarDOW[dow]; | |
| } | |
| } | |
| params[8] = endRule.secondOfDay * 1000; | |
| params[9] = toSTZTime[endRule.timeDefinition]; | |
| dstSavings = (startRule.offsetAfter - startRule.offsetBefore) * 1000; | |
| // Note: known mismatching -> Africa/Cairo | |
| // ZoneInfo : startDayOfWeek=5 <= Thursday | |
| // startTime=86400000 <= 24:00 | |
| // This: startDayOfWeek=6 <= Friday | |
| // startTime=0 <= 0:00 | |
| if (zoneId.equals("Africa/Cairo") && | |
| params[7] == Calendar.FRIDAY && params[8] == 0) { | |
| params[7] = Calendar.THURSDAY; | |
| params[8] = SECONDS_PER_DAY * 1000; | |
| } | |
| } else if (nTrans > 0) { // only do this if there is something in table already | |
| if (lastyear < LASTYEAR) { | |
| // ZoneInfo has an ending entry for 2100 | |
| //long trans = OffsetDateTime.of(LASTYEAR, 1, 1, 0, 0, 0, 0, | |
| // ZoneOffset.ofTotalSeconds(rawOffset/1000)) | |
| // .toEpochSecond(); | |
| long trans = LDT2100 - rawOffset/1000; | |
| int offsetIndex = indexOf(offsets, 0, nOffsets, rawOffset/1000); | |
| if (offsetIndex == nOffsets) | |
| nOffsets++; | |
| transitions[nTrans++] = (trans * 1000) << TRANSITION_NSHIFT | | |
| (offsetIndex & OFFSET_MASK); | |
| } else if (savingsInstantTransitions.length > 2) { | |
| // Workaround: create the params based on the last pair for | |
| // zones like Israel and Iran which have trans defined | |
| // up until 2037, but no "transition rule" defined | |
| // | |
| // Note: Known mismatching for Israel, Asia/Jerusalem/Tel Aviv | |
| // ZoneInfo: startMode=3 | |
| // startMonth=2 | |
| // startDay=26 | |
| // startDayOfWeek=6 | |
| // | |
| // This: startMode=1 | |
| // startMonth=2 | |
| // startDay=27 | |
| // startDayOfWeek=0 | |
| // these two are actually the same for 2037, the SimpleTimeZone | |
| // for the last "known" year | |
| int m = savingsInstantTransitions.length; | |
| long startTrans = savingsInstantTransitions[m - 2]; | |
| int startOffset = wallOffsets[m - 2 + 1]; | |
| int startStd = getStandardOffset(standardTransitions, standardOffsets, startTrans); | |
| long endTrans = savingsInstantTransitions[m - 1]; | |
| int endOffset = wallOffsets[m - 1 + 1]; | |
| int endStd = getStandardOffset(standardTransitions, standardOffsets, endTrans); | |
| if (startOffset > startStd && endOffset == endStd) { | |
| // last - 1 trans | |
| m = savingsInstantTransitions.length - 2; | |
| ZoneOffset before = ZoneOffset.ofTotalSeconds(wallOffsets[m]); | |
| ZoneOffset after = ZoneOffset.ofTotalSeconds(wallOffsets[m + 1]); | |
| LocalDateTime ldt = LocalDateTime.ofEpochSecond(savingsInstantTransitions[m], 0, before); | |
| LocalDateTime startLDT; | |
| if (after.getTotalSeconds() > before.getTotalSeconds()) { // isGap() | |
| startLDT = ldt; | |
| } else { | |
| startLDT = ldt.plusSeconds(wallOffsets[m + 1] - wallOffsets[m]); | |
| } | |
| // last trans | |
| m = savingsInstantTransitions.length - 1; | |
| before = ZoneOffset.ofTotalSeconds(wallOffsets[m]); | |
| after = ZoneOffset.ofTotalSeconds(wallOffsets[m + 1]); | |
| ldt = LocalDateTime.ofEpochSecond(savingsInstantTransitions[m], 0, before); | |
| LocalDateTime endLDT; | |
| if (after.getTotalSeconds() > before.getTotalSeconds()) { // isGap() | |
| endLDT = ldt.plusSeconds(wallOffsets[m + 1] - wallOffsets[m]); | |
| } else { | |
| endLDT = ldt; | |
| } | |
| params = new int[10]; | |
| params[0] = startLDT.getMonthValue() - 1; | |
| params[1] = startLDT.getDayOfMonth(); | |
| params[2] = 0; | |
| params[3] = startLDT.toLocalTime().toSecondOfDay() * 1000; | |
| params[4] = SimpleTimeZone.WALL_TIME; | |
| params[5] = endLDT.getMonthValue() - 1; | |
| params[6] = endLDT.getDayOfMonth(); | |
| params[7] = 0; | |
| params[8] = endLDT.toLocalTime().toSecondOfDay() * 1000; | |
| params[9] = SimpleTimeZone.WALL_TIME; | |
| dstSavings = (startOffset - startStd) * 1000; | |
| } | |
| } | |
| } | |
| if (transitions != null && transitions.length != nTrans) { | |
| if (nTrans == 0) { | |
| transitions = null; | |
| } else { | |
| transitions = Arrays.copyOf(transitions, nTrans); | |
| } | |
| } | |
| if (offsets != null && offsets.length != nOffsets) { | |
| if (nOffsets == 0) { | |
| offsets = null; | |
| } else { | |
| offsets = Arrays.copyOf(offsets, nOffsets); | |
| } | |
| } | |
| if (transitions != null) { | |
| Checksum sum = new Checksum(); | |
| for (i = 0; i < transitions.length; i++) { | |
| long val = transitions[i]; | |
| int dst = (int)((val >>> DST_NSHIFT) & 0xfL); | |
| int index = (int)(val & OFFSET_MASK); | |
| long second = (val >> TRANSITION_NSHIFT); | |
| // javazic uses "index of the offset in offsets", | |
| // instead of the real offset value itself to | |
| // calculate the checksum. Have to keep doing | |
| // the same thing, checksum is part of the | |
| // ZoneInfo serialization form. | |
| sum.update(second + index); | |
| sum.update(index); | |
| sum.update(dst == 0 ? -1 : dst); | |
| } | |
| checksum = (int)sum.getValue(); | |
| } | |
| } | |
| return new ZoneInfo(zoneId, rawOffset, dstSavings, checksum, transitions, | |
| offsets, params, willGMTOffsetChange); | |
| } | |
| private static int getStandardOffset(long[] standardTransitions, | |
| int[] standardOffsets, | |
| long epochSec) { | |
| // The size of stdOffsets is [0..9], with most are | |
| // [1..4] entries , simple loop search is faster | |
| // | |
| // int index = Arrays.binarySearch(standardTransitions, epochSec); | |
| // if (index < 0) { | |
| // // switch negative insert position to start of matched range | |
| // index = -index - 2; | |
| // } | |
| // return standardOffsets[index + 1]; | |
| int index = 0; | |
| for (; index < standardTransitions.length; index++) { | |
| if (epochSec < standardTransitions[index]) { | |
| break; | |
| } | |
| } | |
| return standardOffsets[index]; | |
| } | |
| static final int SECONDS_PER_DAY = 86400; | |
| static final int DAYS_PER_CYCLE = 146097; | |
| static final long DAYS_0000_TO_1970 = (DAYS_PER_CYCLE * 5L) - (30L * 365L + 7L); | |
| private static int getYear(long epochSecond, int offset) { | |
| long second = epochSecond + offset; // overflow caught later | |
| long epochDay = Math.floorDiv(second, SECONDS_PER_DAY); | |
| long zeroDay = epochDay + DAYS_0000_TO_1970; | |
| // find the march-based year | |
| zeroDay -= 60; // adjust to 0000-03-01 so leap day is at end of four year cycle | |
| long adjust = 0; | |
| if (zeroDay < 0) { | |
| // adjust negative years to positive for calculation | |
| long adjustCycles = (zeroDay + 1) / DAYS_PER_CYCLE - 1; | |
| adjust = adjustCycles * 400; | |
| zeroDay += -adjustCycles * DAYS_PER_CYCLE; | |
| } | |
| long yearEst = (400 * zeroDay + 591) / DAYS_PER_CYCLE; | |
| long doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400); | |
| if (doyEst < 0) { | |
| // fix estimate | |
| yearEst--; | |
| doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400); | |
| } | |
| yearEst += adjust; // reset any negative year | |
| int marchDoy0 = (int) doyEst; | |
| // convert march-based values back to january-based | |
| int marchMonth0 = (marchDoy0 * 5 + 2) / 153; | |
| yearEst += marchMonth0 / 10; | |
| return (int)yearEst; | |
| } | |
| private static final int[] toCalendarDOW = new int[] { | |
| -1, | |
| Calendar.MONDAY, | |
| Calendar.TUESDAY, | |
| Calendar.WEDNESDAY, | |
| Calendar.THURSDAY, | |
| Calendar.FRIDAY, | |
| Calendar.SATURDAY, | |
| Calendar.SUNDAY | |
| }; | |
| private static final int[] toSTZTime = new int[] { | |
| SimpleTimeZone.UTC_TIME, | |
| SimpleTimeZone.WALL_TIME, | |
| SimpleTimeZone.STANDARD_TIME, | |
| }; | |
| private static final long OFFSET_MASK = 0x0fL; | |
| private static final long DST_MASK = 0xf0L; | |
| private static final int DST_NSHIFT = 4; | |
| private static final int TRANSITION_NSHIFT = 12; | |
| // The `last` year that transitions are accounted for. If there are | |
| // rules that go beyond this LASTYEAR, the value needs to be expanded. | |
| private static final int LASTYEAR = 2100; | |
| // from: 0 for offset lookup, 1 for dstsvings lookup | |
| private static int indexOf(int[] offsets, int from, int nOffsets, int offset) { | |
| offset *= 1000; | |
| for (; from < nOffsets; from++) { | |
| if (offsets[from] == offset) | |
| return from; | |
| } | |
| offsets[from] = offset; | |
| return from; | |
| } | |
| // return updated nOffsets | |
| private static int addTrans(long[] transitions, int nTrans, | |
| int[] offsets, int nOffsets, | |
| long trans, int offset, int stdOffset) { | |
| int offsetIndex = indexOf(offsets, 0, nOffsets, offset); | |
| if (offsetIndex == nOffsets) | |
| nOffsets++; | |
| int dstIndex = 0; | |
| if (offset != stdOffset) { | |
| dstIndex = indexOf(offsets, 1, nOffsets, offset - stdOffset); | |
| if (dstIndex == nOffsets) | |
| nOffsets++; | |
| } | |
| transitions[nTrans] = ((trans * 1000) << TRANSITION_NSHIFT) | | |
| ((dstIndex << DST_NSHIFT) & DST_MASK) | | |
| (offsetIndex & OFFSET_MASK); | |
| return nOffsets; | |
| } | |
| // ZoneInfo checksum, copy/pasted from javazic | |
| private static class Checksum extends CRC32 { | |
| public void update(int val) { | |
| byte[] b = new byte[4]; | |
| b[0] = (byte)(val >>> 24); | |
| b[1] = (byte)(val >>> 16); | |
| b[2] = (byte)(val >>> 8); | |
| b[3] = (byte)(val); | |
| update(b); | |
| } | |
| void update(long val) { | |
| byte[] b = new byte[8]; | |
| b[0] = (byte)(val >>> 56); | |
| b[1] = (byte)(val >>> 48); | |
| b[2] = (byte)(val >>> 40); | |
| b[3] = (byte)(val >>> 32); | |
| b[4] = (byte)(val >>> 24); | |
| b[5] = (byte)(val >>> 16); | |
| b[6] = (byte)(val >>> 8); | |
| b[7] = (byte)(val); | |
| update(b); | |
| } | |
| } | |
| // A simple/raw version of j.t.ZoneOffsetTransitionRule | |
| // timeEndOfDay is included in secondOfDay as "86,400" secs. | |
| private static class ZoneOffsetTransitionRule { | |
| private final int month; | |
| private final byte dom; | |
| private final int dow; | |
| private final int secondOfDay; | |
| private final int timeDefinition; | |
| private final int standardOffset; | |
| private final int offsetBefore; | |
| private final int offsetAfter; | |
| ZoneOffsetTransitionRule(DataInput in) throws IOException { | |
| int data = in.readInt(); | |
| int dowByte = (data & (7 << 19)) >>> 19; | |
| int timeByte = (data & (31 << 14)) >>> 14; | |
| int stdByte = (data & (255 << 4)) >>> 4; | |
| int beforeByte = (data & (3 << 2)) >>> 2; | |
| int afterByte = (data & 3); | |
| this.month = data >>> 28; | |
| this.dom = (byte)(((data & (63 << 22)) >>> 22) - 32); | |
| this.dow = dowByte == 0 ? -1 : dowByte; | |
| this.secondOfDay = timeByte == 31 ? in.readInt() : timeByte * 3600; | |
| this.timeDefinition = (data & (3 << 12)) >>> 12; | |
| this.standardOffset = stdByte == 255 ? in.readInt() : (stdByte - 128) * 900; | |
| this.offsetBefore = beforeByte == 3 ? in.readInt() : standardOffset + beforeByte * 1800; | |
| this.offsetAfter = afterByte == 3 ? in.readInt() : standardOffset + afterByte * 1800; | |
| } | |
| long getTransitionEpochSecond(int year) { | |
| long epochDay = 0; | |
| if (dom < 0) { | |
| epochDay = toEpochDay(year, month, lengthOfMonth(year, month) + 1 + dom); | |
| if (dow != -1) { | |
| epochDay = previousOrSame(epochDay, dow); | |
| } | |
| } else { | |
| epochDay = toEpochDay(year, month, dom); | |
| if (dow != -1) { | |
| epochDay = nextOrSame(epochDay, dow); | |
| } | |
| } | |
| int difference = 0; | |
| switch (timeDefinition) { | |
| case 0: // UTC | |
| difference = 0; | |
| break; | |
| case 1: // WALL | |
| difference = -offsetBefore; | |
| break; | |
| case 2: //STANDARD | |
| difference = -standardOffset; | |
| break; | |
| } | |
| return epochDay * 86400 + secondOfDay + difference; | |
| } | |
| static final boolean isLeapYear(int year) { | |
| return CalendarUtils.isGregorianLeapYear(year); | |
| } | |
| static final int lengthOfMonth(int year, int month) { | |
| switch (month) { | |
| case 2: //FEBRUARY: | |
| return isLeapYear(year)? 29 : 28; | |
| case 4: //APRIL: | |
| case 6: //JUNE: | |
| case 9: //SEPTEMBER: | |
| case 11: //NOVEMBER: | |
| return 30; | |
| default: | |
| return 31; | |
| } | |
| } | |
| static final long toEpochDay(int year, int month, int day) { | |
| long y = year; | |
| long m = month; | |
| long total = 0; | |
| total += 365 * y; | |
| if (y >= 0) { | |
| total += (y + 3) / 4 - (y + 99) / 100 + (y + 399) / 400; | |
| } else { | |
| total -= y / -4 - y / -100 + y / -400; | |
| } | |
| total += ((367 * m - 362) / 12); | |
| total += day - 1; | |
| if (m > 2) { | |
| total--; | |
| if (!isLeapYear(year)) { | |
| total--; | |
| } | |
| } | |
| return total - DAYS_0000_TO_1970; | |
| } | |
| static final long previousOrSame(long epochDay, int dayOfWeek) { | |
| return adjust(epochDay, dayOfWeek, 1); | |
| } | |
| static final long nextOrSame(long epochDay, int dayOfWeek) { | |
| return adjust(epochDay, dayOfWeek, 0); | |
| } | |
| static final long adjust(long epochDay, int dow, int relative) { | |
| int calDow = (int)Math.floorMod(epochDay + 3, 7L) + 1; | |
| if (relative < 2 && calDow == dow) { | |
| return epochDay; | |
| } | |
| if ((relative & 1) == 0) { | |
| int daysDiff = calDow - dow; | |
| return epochDay + (daysDiff >= 0 ? 7 - daysDiff : -daysDiff); | |
| } else { | |
| int daysDiff = dow - calDow; | |
| return epochDay - (daysDiff >= 0 ? 7 - daysDiff : -daysDiff); | |
| } | |
| } | |
| } | |
| } |