//! 时区数据源与 TZif 解析器：IANA tzdata 2026b 全量树 vendored 于 `third_party/tzdb/`， //! 引擎内置 legacy 别名表，不读宿主系统 zoneinfo。 //! //! 关键约定： //! - 数据版本钉住 tzdata 2026b，全量树随仓库，保证各环境逐字节一致；legacy 区名 //! （2026b 已移除）由引擎内 `LEGACY_ALIASES` 表解析，独立于数据版本。 //! - 偏移一律以秒存（i32），保亚分钟精度（LMT、Lord Howe 半小时 DST 等）； //! `transitions` 按纪元秒严格升序，最后一次 transition 之后的偏移预存于 `last_offset`。 //! - 闰秒不建模：闰秒表只用于推进解析指针，Temporal 时间线为连续纳秒轴。 //! - 刷新程序：从宿主 /usr/share/zoneinfo 以 `cp -rL` 复制 11 个区域目录加顶层区文件 //! （排除机器相关的 localtime 与源文件 tzdata.zi / leap-seconds.list），并更新本 //! 注释的版本行。 use std::sync::LazyLock; use super::common::fixed_offset_seconds; /// 单个时区的解析结果：transition 表加偏移查找所需的预存值。 /// /// `transitions` 为 `(纪元秒, 该时刻起生效的偏移秒)`，按纪元秒严格升序； /// 早于首个 transition 的偏移取 `lmt_offset`（首个 time type，即 LMT）， /// 晚于末个 transition 的偏移取 `last_offset`（POSIX TZ 串语义，与末次 transition 一致）。 pub(crate) struct TzifZone { lmt_offset: i32, transitions: Vec<(i64, i32)>, last_offset: i32, } /// TZif 解析失败原因。 #[derive(Debug)] pub(crate) enum TzifError { /// 文件在声明的块边界前截断。 Truncated, /// 魔数不是 `TZif`。 BadMagic, /// 版本字节不是 0 / 2 / 3 / 4。 BadVersion, } /// TZif 头的 6 个计数字段（isutcnt / isstdcnt / leapcnt / timecnt / typecnt / charcnt）。 #[derive(Clone, Copy)] struct Counts { isutcnt: u32, isstdcnt: u32, leapcnt: u32, timecnt: u32, typecnt: u32, charcnt: u32, } /// 单个数据块的解析结果：transition 时间、transition 类型索引、本地时间类型偏移。 struct ParsedBlock { trans: Vec, ttypes: Vec, types: Vec, } /// 读 44 字节头的 6 个计数字段。 /// /// # 边界与前提 /// - 调用方须保证 `off + 44` 不越界（本函数自行校验）。 /// /// # 注意事项 /// - 计数字段从偏移 20 起（magic 4 + version 1 + 保留 15）。 fn read_counts(bytes: &[u8], off: usize) -> Result { if bytes.len() < off + 44 { return Err(TzifError::Truncated); } let d = |i: usize| u32::from_be_bytes(bytes[off + 20 + i * 4..off + 24 + i * 4].try_into().unwrap()); Ok(Counts { isutcnt: d(0), isstdcnt: d(1), leapcnt: d(2), timecnt: d(3), typecnt: d(4), charcnt: d(5), }) } /// 数据块总字节数（transition 时间 + 类型 + 本地时间类型记录 + 区名 + 闰秒 + 指示位）。 fn block_size(c: &Counts, time_size: usize) -> usize { c.timecnt as usize * time_size + c.timecnt as usize + c.typecnt as usize * 6 + c.charcnt as usize + c.leapcnt as usize * (time_size + 4) + c.isstdcnt as usize + c.isutcnt as usize } /// 读一个数据块：transition 时间、transition 类型索引、本地时间类型偏移。 /// /// # 边界与前提 /// - 调用方须保证块完整（本函数按 `block_size` 校验总长）。 /// - `time_size` 为 4（v1）或 8（v2+）。 /// /// # 注意事项 /// - transition 类型索引越界（超出 typecnt）视为截断，防越界读。 fn read_block(bytes: &[u8], off: usize, c: &Counts, time_size: usize) -> Result { let need = off + block_size(c, time_size); if bytes.len() < need { return Err(TzifError::Truncated); } let mut p = off; // transition 时间（有符号，v1 为 32 位、v2+ 为 64 位）。 let mut trans = Vec::with_capacity(c.timecnt as usize); for _ in 0..c.timecnt { let v = if time_size == 8 { i64::from_be_bytes(bytes[p..p + 8].try_into().unwrap()) } else { i32::from_be_bytes(bytes[p..p + 4].try_into().unwrap()) as i64 }; trans.push(v); p += time_size; } // transition 类型索引（每 transition 一字节）。 let ttypes = bytes[p..p + c.timecnt as usize].to_vec(); p += c.timecnt as usize; // 本地时间类型记录（6 字节：utoff 4 + isdst 1 + idx 1），只取 utoff。 let mut types = Vec::with_capacity(c.typecnt as usize); for _ in 0..c.typecnt { let utoff = i32::from_be_bytes(bytes[p..p + 4].try_into().unwrap()); types.push(utoff); p += 6; } for &idx in &ttypes { if idx >= c.typecnt as u8 { return Err(TzifError::Truncated); } } Ok(ParsedBlock { trans, ttypes, types }) } /// 解析 TZif 二进制为 `TzifZone`。 /// /// # 步骤 /// 1. 校验魔数与版本字节。 /// 2. 读 v1 头；版本 ≥ 2 时跳过 v1 块、读 v2+ 头，一律用 64 位块（1970 年前 /// transition 为负值自然容纳）；版本 1 用 32 位块。 /// 3. 由 transition 类型索引与本地时间类型记录组装 `(纪元秒, 偏移秒)` 表； /// LMT 取首个 time type，末偏移取末次 transition 的偏移。 /// /// # 边界与前提 /// - 闰秒表按 `leapcnt * (time_size + 4)` 推进指针，不建模。 /// - POSIX TZ 串（footer）读出后丢弃：末偏移已由末次 transition 给出。 /// /// # 注意事项 /// - 纯解析，无副作用；调用方负责把结果挂到静态表。 pub(crate) fn parse_tzif(bytes: &[u8]) -> Result { if bytes.len() < 44 { return Err(TzifError::Truncated); } if &bytes[0..4] != b"TZif" { return Err(TzifError::BadMagic); } let version = bytes[4]; if !matches!(version, 0 | b'2' | b'3' | b'4') { return Err(TzifError::BadVersion); } // v1 头计数（版本 ≥ 2 时 v1 块是占位，只用于算跳过长度）。 let c1 = read_counts(bytes, 0)?; let block = if version >= b'2' { let v1_size = block_size(&c1, 4); let off = 44 + v1_size; if bytes.len() < off + 44 { return Err(TzifError::Truncated); } if &bytes[off..off + 4] != b"TZif" { return Err(TzifError::BadMagic); } let c2 = read_counts(bytes, off)?; read_block(bytes, off + 44, &c2, 8)? } else { read_block(bytes, 44, &c1, 4)? }; // LMT 是首个 time type 的偏移；末偏移取末次 transition 的偏移（POSIX TZ 串语义）。 let lmt_offset = block.types.first().copied().unwrap_or(0); let transitions: Vec<(i64, i32)> = block .trans .iter() .enumerate() .map(|(i, &t)| (t, block.types[block.ttypes[i] as usize])) .collect(); let last_offset = transitions.last().map(|&(_, o)| o).unwrap_or(lmt_offset); Ok(TzifZone { lmt_offset, transitions, last_offset, }) } const ZONE_FILES: &[(&str, &[u8])] = &[ ("Africa/Abidjan", include_bytes!("../../../../third_party/tzdb/Africa/Abidjan")), ("Africa/Accra", include_bytes!("../../../../third_party/tzdb/Africa/Accra")), ("Africa/Addis_Ababa", include_bytes!("../../../../third_party/tzdb/Africa/Addis_Ababa")), ("Africa/Algiers", include_bytes!("../../../../third_party/tzdb/Africa/Algiers")), ("Africa/Asmara", include_bytes!("../../../../third_party/tzdb/Africa/Asmara")), ("Africa/Bamako", include_bytes!("../../../../third_party/tzdb/Africa/Bamako")), ("Africa/Bangui", include_bytes!("../../../../third_party/tzdb/Africa/Bangui")), ("Africa/Banjul", include_bytes!("../../../../third_party/tzdb/Africa/Banjul")), ("Africa/Bissau", include_bytes!("../../../../third_party/tzdb/Africa/Bissau")), ("Africa/Blantyre", include_bytes!("../../../../third_party/tzdb/Africa/Blantyre")), ("Africa/Brazzaville", include_bytes!("../../../../third_party/tzdb/Africa/Brazzaville")), ("Africa/Bujumbura", include_bytes!("../../../../third_party/tzdb/Africa/Bujumbura")), ("Africa/Cairo", include_bytes!("../../../../third_party/tzdb/Africa/Cairo")), ("Africa/Casablanca", include_bytes!("../../../../third_party/tzdb/Africa/Casablanca")), ("Africa/Ceuta", include_bytes!("../../../../third_party/tzdb/Africa/Ceuta")), ("Africa/Conakry", include_bytes!("../../../../third_party/tzdb/Africa/Conakry")), ("Africa/Dakar", include_bytes!("../../../../third_party/tzdb/Africa/Dakar")), ( "Africa/Dar_es_Salaam", include_bytes!("../../../../third_party/tzdb/Africa/Dar_es_Salaam"), ), ("Africa/Djibouti", include_bytes!("../../../../third_party/tzdb/Africa/Djibouti")), ("Africa/Douala", include_bytes!("../../../../third_party/tzdb/Africa/Douala")), ("Africa/El_Aaiun", include_bytes!("../../../../third_party/tzdb/Africa/El_Aaiun")), ("Africa/Freetown", include_bytes!("../../../../third_party/tzdb/Africa/Freetown")), ("Africa/Gaborone", include_bytes!("../../../../third_party/tzdb/Africa/Gaborone")), ("Africa/Harare", include_bytes!("../../../../third_party/tzdb/Africa/Harare")), ("Africa/Johannesburg", include_bytes!("../../../../third_party/tzdb/Africa/Johannesburg")), ("Africa/Juba", include_bytes!("../../../../third_party/tzdb/Africa/Juba")), ("Africa/Kampala", include_bytes!("../../../../third_party/tzdb/Africa/Kampala")), ("Africa/Khartoum", include_bytes!("../../../../third_party/tzdb/Africa/Khartoum")), ("Africa/Kigali", include_bytes!("../../../../third_party/tzdb/Africa/Kigali")), ("Africa/Kinshasa", include_bytes!("../../../../third_party/tzdb/Africa/Kinshasa")), ("Africa/Lagos", include_bytes!("../../../../third_party/tzdb/Africa/Lagos")), ("Africa/Libreville", include_bytes!("../../../../third_party/tzdb/Africa/Libreville")), ("Africa/Lome", include_bytes!("../../../../third_party/tzdb/Africa/Lome")), ("Africa/Luanda", include_bytes!("../../../../third_party/tzdb/Africa/Luanda")), ("Africa/Lubumbashi", include_bytes!("../../../../third_party/tzdb/Africa/Lubumbashi")), ("Africa/Lusaka", include_bytes!("../../../../third_party/tzdb/Africa/Lusaka")), ("Africa/Malabo", include_bytes!("../../../../third_party/tzdb/Africa/Malabo")), ("Africa/Maputo", include_bytes!("../../../../third_party/tzdb/Africa/Maputo")), ("Africa/Maseru", include_bytes!("../../../../third_party/tzdb/Africa/Maseru")), ("Africa/Mbabane", include_bytes!("../../../../third_party/tzdb/Africa/Mbabane")), ("Africa/Mogadishu", include_bytes!("../../../../third_party/tzdb/Africa/Mogadishu")), ("Africa/Monrovia", include_bytes!("../../../../third_party/tzdb/Africa/Monrovia")), ("Africa/Nairobi", include_bytes!("../../../../third_party/tzdb/Africa/Nairobi")), ("Africa/Ndjamena", include_bytes!("../../../../third_party/tzdb/Africa/Ndjamena")), ("Africa/Niamey", include_bytes!("../../../../third_party/tzdb/Africa/Niamey")), ("Africa/Nouakchott", include_bytes!("../../../../third_party/tzdb/Africa/Nouakchott")), ("Africa/Ouagadougou", include_bytes!("../../../../third_party/tzdb/Africa/Ouagadougou")), ("Africa/Porto-Novo", include_bytes!("../../../../third_party/tzdb/Africa/Porto-Novo")), ("Africa/Sao_Tome", include_bytes!("../../../../third_party/tzdb/Africa/Sao_Tome")), ("Africa/Timbuktu", include_bytes!("../../../../third_party/tzdb/Africa/Timbuktu")), ("Africa/Tripoli", include_bytes!("../../../../third_party/tzdb/Africa/Tripoli")), ("Africa/Tunis", include_bytes!("../../../../third_party/tzdb/Africa/Tunis")), ("Africa/Windhoek", include_bytes!("../../../../third_party/tzdb/Africa/Windhoek")), ("America/Adak", include_bytes!("../../../../third_party/tzdb/America/Adak")), ("America/Anchorage", include_bytes!("../../../../third_party/tzdb/America/Anchorage")), ("America/Anguilla", include_bytes!("../../../../third_party/tzdb/America/Anguilla")), ("America/Antigua", include_bytes!("../../../../third_party/tzdb/America/Antigua")), ("America/Araguaina", include_bytes!("../../../../third_party/tzdb/America/Araguaina")), ( "America/Argentina/Buenos_Aires", include_bytes!("../../../../third_party/tzdb/America/Argentina/Buenos_Aires"), ), ( "America/Argentina/Catamarca", include_bytes!("../../../../third_party/tzdb/America/Argentina/Catamarca"), ), ( "America/Argentina/Cordoba", include_bytes!("../../../../third_party/tzdb/America/Argentina/Cordoba"), ), ( "America/Argentina/Jujuy", include_bytes!("../../../../third_party/tzdb/America/Argentina/Jujuy"), ), ( "America/Argentina/La_Rioja", include_bytes!("../../../../third_party/tzdb/America/Argentina/La_Rioja"), ), ( "America/Argentina/Mendoza", include_bytes!("../../../../third_party/tzdb/America/Argentina/Mendoza"), ), ( "America/Argentina/Rio_Gallegos", include_bytes!("../../../../third_party/tzdb/America/Argentina/Rio_Gallegos"), ), ( "America/Argentina/Salta", include_bytes!("../../../../third_party/tzdb/America/Argentina/Salta"), ), ( "America/Argentina/San_Juan", include_bytes!("../../../../third_party/tzdb/America/Argentina/San_Juan"), ), ( "America/Argentina/San_Luis", include_bytes!("../../../../third_party/tzdb/America/Argentina/San_Luis"), ), ( "America/Argentina/Tucuman", include_bytes!("../../../../third_party/tzdb/America/Argentina/Tucuman"), ), ( "America/Argentina/Ushuaia", include_bytes!("../../../../third_party/tzdb/America/Argentina/Ushuaia"), ), ("America/Aruba", include_bytes!("../../../../third_party/tzdb/America/Aruba")), ("America/Asuncion", include_bytes!("../../../../third_party/tzdb/America/Asuncion")), ("America/Atikokan", include_bytes!("../../../../third_party/tzdb/America/Atikokan")), ("America/Atka", include_bytes!("../../../../third_party/tzdb/America/Atka")), ("America/Bahia", include_bytes!("../../../../third_party/tzdb/America/Bahia")), ( "America/Bahia_Banderas", include_bytes!("../../../../third_party/tzdb/America/Bahia_Banderas"), ), ("America/Barbados", include_bytes!("../../../../third_party/tzdb/America/Barbados")), ("America/Belem", include_bytes!("../../../../third_party/tzdb/America/Belem")), ("America/Belize", include_bytes!("../../../../third_party/tzdb/America/Belize")), ( "America/Blanc-Sablon", include_bytes!("../../../../third_party/tzdb/America/Blanc-Sablon"), ), ("America/Boa_Vista", include_bytes!("../../../../third_party/tzdb/America/Boa_Vista")), ("America/Bogota", include_bytes!("../../../../third_party/tzdb/America/Bogota")), ("America/Boise", include_bytes!("../../../../third_party/tzdb/America/Boise")), ( "America/Cambridge_Bay", include_bytes!("../../../../third_party/tzdb/America/Cambridge_Bay"), ), ( "America/Campo_Grande", include_bytes!("../../../../third_party/tzdb/America/Campo_Grande"), ), ("America/Cancun", include_bytes!("../../../../third_party/tzdb/America/Cancun")), ("America/Caracas", include_bytes!("../../../../third_party/tzdb/America/Caracas")), ("America/Cayenne", include_bytes!("../../../../third_party/tzdb/America/Cayenne")), ("America/Cayman", include_bytes!("../../../../third_party/tzdb/America/Cayman")), ("America/Chicago", include_bytes!("../../../../third_party/tzdb/America/Chicago")), ("America/Chihuahua", include_bytes!("../../../../third_party/tzdb/America/Chihuahua")), ( "America/Ciudad_Juarez", include_bytes!("../../../../third_party/tzdb/America/Ciudad_Juarez"), ), ( "America/Coral_Harbour", include_bytes!("../../../../third_party/tzdb/America/Coral_Harbour"), ), ("America/Costa_Rica", include_bytes!("../../../../third_party/tzdb/America/Costa_Rica")), ("America/Coyhaique", include_bytes!("../../../../third_party/tzdb/America/Coyhaique")), ("America/Creston", include_bytes!("../../../../third_party/tzdb/America/Creston")), ("America/Cuiaba", include_bytes!("../../../../third_party/tzdb/America/Cuiaba")), ("America/Curacao", include_bytes!("../../../../third_party/tzdb/America/Curacao")), ( "America/Danmarkshavn", include_bytes!("../../../../third_party/tzdb/America/Danmarkshavn"), ), ("America/Dawson", include_bytes!("../../../../third_party/tzdb/America/Dawson")), ( "America/Dawson_Creek", include_bytes!("../../../../third_party/tzdb/America/Dawson_Creek"), ), ("America/Denver", include_bytes!("../../../../third_party/tzdb/America/Denver")), ("America/Detroit", include_bytes!("../../../../third_party/tzdb/America/Detroit")), ("America/Dominica", include_bytes!("../../../../third_party/tzdb/America/Dominica")), ("America/Edmonton", include_bytes!("../../../../third_party/tzdb/America/Edmonton")), ("America/Eirunepe", include_bytes!("../../../../third_party/tzdb/America/Eirunepe")), ("America/El_Salvador", include_bytes!("../../../../third_party/tzdb/America/El_Salvador")), ("America/Ensenada", include_bytes!("../../../../third_party/tzdb/America/Ensenada")), ("America/Fort_Nelson", include_bytes!("../../../../third_party/tzdb/America/Fort_Nelson")), ("America/Fortaleza", include_bytes!("../../../../third_party/tzdb/America/Fortaleza")), ("America/Glace_Bay", include_bytes!("../../../../third_party/tzdb/America/Glace_Bay")), ("America/Goose_Bay", include_bytes!("../../../../third_party/tzdb/America/Goose_Bay")), ("America/Grand_Turk", include_bytes!("../../../../third_party/tzdb/America/Grand_Turk")), ("America/Grenada", include_bytes!("../../../../third_party/tzdb/America/Grenada")), ("America/Guadeloupe", include_bytes!("../../../../third_party/tzdb/America/Guadeloupe")), ("America/Guatemala", include_bytes!("../../../../third_party/tzdb/America/Guatemala")), ("America/Guayaquil", include_bytes!("../../../../third_party/tzdb/America/Guayaquil")), ("America/Guyana", include_bytes!("../../../../third_party/tzdb/America/Guyana")), ("America/Halifax", include_bytes!("../../../../third_party/tzdb/America/Halifax")), ("America/Havana", include_bytes!("../../../../third_party/tzdb/America/Havana")), ("America/Hermosillo", include_bytes!("../../../../third_party/tzdb/America/Hermosillo")), ( "America/Indiana/Indianapolis", include_bytes!("../../../../third_party/tzdb/America/Indiana/Indianapolis"), ), ( "America/Indiana/Knox", include_bytes!("../../../../third_party/tzdb/America/Indiana/Knox"), ), ( "America/Indiana/Marengo", include_bytes!("../../../../third_party/tzdb/America/Indiana/Marengo"), ), ( "America/Indiana/Petersburg", include_bytes!("../../../../third_party/tzdb/America/Indiana/Petersburg"), ), ( "America/Indiana/Tell_City", include_bytes!("../../../../third_party/tzdb/America/Indiana/Tell_City"), ), ( "America/Indiana/Vevay", include_bytes!("../../../../third_party/tzdb/America/Indiana/Vevay"), ), ( "America/Indiana/Vincennes", include_bytes!("../../../../third_party/tzdb/America/Indiana/Vincennes"), ), ( "America/Indiana/Winamac", include_bytes!("../../../../third_party/tzdb/America/Indiana/Winamac"), ), ("America/Inuvik", include_bytes!("../../../../third_party/tzdb/America/Inuvik")), ("America/Iqaluit", include_bytes!("../../../../third_party/tzdb/America/Iqaluit")), ("America/Jamaica", include_bytes!("../../../../third_party/tzdb/America/Jamaica")), ("America/Juneau", include_bytes!("../../../../third_party/tzdb/America/Juneau")), ( "America/Kentucky/Louisville", include_bytes!("../../../../third_party/tzdb/America/Kentucky/Louisville"), ), ( "America/Kentucky/Monticello", include_bytes!("../../../../third_party/tzdb/America/Kentucky/Monticello"), ), ("America/Kralendijk", include_bytes!("../../../../third_party/tzdb/America/Kralendijk")), ("America/La_Paz", include_bytes!("../../../../third_party/tzdb/America/La_Paz")), ("America/Lima", include_bytes!("../../../../third_party/tzdb/America/Lima")), ("America/Los_Angeles", include_bytes!("../../../../third_party/tzdb/America/Los_Angeles")), ( "America/Lower_Princes", include_bytes!("../../../../third_party/tzdb/America/Lower_Princes"), ), ("America/Maceio", include_bytes!("../../../../third_party/tzdb/America/Maceio")), ("America/Managua", include_bytes!("../../../../third_party/tzdb/America/Managua")), ("America/Manaus", include_bytes!("../../../../third_party/tzdb/America/Manaus")), ("America/Marigot", include_bytes!("../../../../third_party/tzdb/America/Marigot")), ("America/Martinique", include_bytes!("../../../../third_party/tzdb/America/Martinique")), ("America/Matamoros", include_bytes!("../../../../third_party/tzdb/America/Matamoros")), ("America/Mazatlan", include_bytes!("../../../../third_party/tzdb/America/Mazatlan")), ("America/Menominee", include_bytes!("../../../../third_party/tzdb/America/Menominee")), ("America/Merida", include_bytes!("../../../../third_party/tzdb/America/Merida")), ("America/Metlakatla", include_bytes!("../../../../third_party/tzdb/America/Metlakatla")), ("America/Mexico_City", include_bytes!("../../../../third_party/tzdb/America/Mexico_City")), ("America/Miquelon", include_bytes!("../../../../third_party/tzdb/America/Miquelon")), ("America/Moncton", include_bytes!("../../../../third_party/tzdb/America/Moncton")), ("America/Monterrey", include_bytes!("../../../../third_party/tzdb/America/Monterrey")), ("America/Montevideo", 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include_bytes!("../../../../third_party/tzdb/Europe/Samara")), ("Europe/San_Marino", include_bytes!("../../../../third_party/tzdb/Europe/San_Marino")), ("Europe/Sarajevo", include_bytes!("../../../../third_party/tzdb/Europe/Sarajevo")), ("Europe/Saratov", include_bytes!("../../../../third_party/tzdb/Europe/Saratov")), ("Europe/Simferopol", include_bytes!("../../../../third_party/tzdb/Europe/Simferopol")), ("Europe/Skopje", include_bytes!("../../../../third_party/tzdb/Europe/Skopje")), ("Europe/Sofia", include_bytes!("../../../../third_party/tzdb/Europe/Sofia")), ("Europe/Stockholm", include_bytes!("../../../../third_party/tzdb/Europe/Stockholm")), ("Europe/Tallinn", include_bytes!("../../../../third_party/tzdb/Europe/Tallinn")), ("Europe/Tirane", include_bytes!("../../../../third_party/tzdb/Europe/Tirane")), ("Europe/Tiraspol", include_bytes!("../../../../third_party/tzdb/Europe/Tiraspol")), ("Europe/Ulyanovsk", include_bytes!("../../../../third_party/tzdb/Europe/Ulyanovsk")), ("Europe/Vaduz", include_bytes!("../../../../third_party/tzdb/Europe/Vaduz")), ("Europe/Vatican", include_bytes!("../../../../third_party/tzdb/Europe/Vatican")), ("Europe/Vienna", include_bytes!("../../../../third_party/tzdb/Europe/Vienna")), ("Europe/Vilnius", include_bytes!("../../../../third_party/tzdb/Europe/Vilnius")), ("Europe/Volgograd", include_bytes!("../../../../third_party/tzdb/Europe/Volgograd")), ("Europe/Warsaw", include_bytes!("../../../../third_party/tzdb/Europe/Warsaw")), ("Europe/Zagreb", include_bytes!("../../../../third_party/tzdb/Europe/Zagreb")), ("Europe/Zurich", include_bytes!("../../../../third_party/tzdb/Europe/Zurich")), ("Factory", include_bytes!("../../../../third_party/tzdb/Factory")), ("GMT", include_bytes!("../../../../third_party/tzdb/GMT")), ("Indian/Antananarivo", include_bytes!("../../../../third_party/tzdb/Indian/Antananarivo")), ("Indian/Chagos", include_bytes!("../../../../third_party/tzdb/Indian/Chagos")), ("Indian/Christmas", include_bytes!("../../../../third_party/tzdb/Indian/Christmas")), ("Indian/Cocos", include_bytes!("../../../../third_party/tzdb/Indian/Cocos")), ("Indian/Comoro", include_bytes!("../../../../third_party/tzdb/Indian/Comoro")), ("Indian/Kerguelen", include_bytes!("../../../../third_party/tzdb/Indian/Kerguelen")), ("Indian/Mahe", include_bytes!("../../../../third_party/tzdb/Indian/Mahe")), ("Indian/Maldives", include_bytes!("../../../../third_party/tzdb/Indian/Maldives")), ("Indian/Mauritius", include_bytes!("../../../../third_party/tzdb/Indian/Mauritius")), ("Indian/Mayotte", include_bytes!("../../../../third_party/tzdb/Indian/Mayotte")), ("Indian/Reunion", include_bytes!("../../../../third_party/tzdb/Indian/Reunion")), ("Pacific/Apia", include_bytes!("../../../../third_party/tzdb/Pacific/Apia")), ("Pacific/Auckland", include_bytes!("../../../../third_party/tzdb/Pacific/Auckland")), ( "Pacific/Bougainville", include_bytes!("../../../../third_party/tzdb/Pacific/Bougainville"), ), ("Pacific/Chatham", include_bytes!("../../../../third_party/tzdb/Pacific/Chatham")), ("Pacific/Chuuk", include_bytes!("../../../../third_party/tzdb/Pacific/Chuuk")), ("Pacific/Easter", include_bytes!("../../../../third_party/tzdb/Pacific/Easter")), ("Pacific/Efate", include_bytes!("../../../../third_party/tzdb/Pacific/Efate")), ("Pacific/Fakaofo", include_bytes!("../../../../third_party/tzdb/Pacific/Fakaofo")), ("Pacific/Fiji", include_bytes!("../../../../third_party/tzdb/Pacific/Fiji")), ("Pacific/Funafuti", include_bytes!("../../../../third_party/tzdb/Pacific/Funafuti")), ("Pacific/Galapagos", include_bytes!("../../../../third_party/tzdb/Pacific/Galapagos")), ("Pacific/Gambier", include_bytes!("../../../../third_party/tzdb/Pacific/Gambier")), ("Pacific/Guadalcanal", include_bytes!("../../../../third_party/tzdb/Pacific/Guadalcanal")), ("Pacific/Guam", include_bytes!("../../../../third_party/tzdb/Pacific/Guam")), ("Pacific/Honolulu", include_bytes!("../../../../third_party/tzdb/Pacific/Honolulu")), ("Pacific/Johnston", include_bytes!("../../../../third_party/tzdb/Pacific/Johnston")), ("Pacific/Kanton", include_bytes!("../../../../third_party/tzdb/Pacific/Kanton")), ("Pacific/Kiritimati", include_bytes!("../../../../third_party/tzdb/Pacific/Kiritimati")), ("Pacific/Kosrae", include_bytes!("../../../../third_party/tzdb/Pacific/Kosrae")), ("Pacific/Kwajalein", include_bytes!("../../../../third_party/tzdb/Pacific/Kwajalein")), ("Pacific/Majuro", include_bytes!("../../../../third_party/tzdb/Pacific/Majuro")), ("Pacific/Marquesas", include_bytes!("../../../../third_party/tzdb/Pacific/Marquesas")), ("Pacific/Midway", include_bytes!("../../../../third_party/tzdb/Pacific/Midway")), ("Pacific/Nauru", include_bytes!("../../../../third_party/tzdb/Pacific/Nauru")), ("Pacific/Niue", include_bytes!("../../../../third_party/tzdb/Pacific/Niue")), ("Pacific/Norfolk", include_bytes!("../../../../third_party/tzdb/Pacific/Norfolk")), ("Pacific/Noumea", include_bytes!("../../../../third_party/tzdb/Pacific/Noumea")), ("Pacific/Pago_Pago", include_bytes!("../../../../third_party/tzdb/Pacific/Pago_Pago")), ("Pacific/Palau", include_bytes!("../../../../third_party/tzdb/Pacific/Palau")), ("Pacific/Pitcairn", include_bytes!("../../../../third_party/tzdb/Pacific/Pitcairn")), ("Pacific/Pohnpei", include_bytes!("../../../../third_party/tzdb/Pacific/Pohnpei")), ( "Pacific/Port_Moresby", include_bytes!("../../../../third_party/tzdb/Pacific/Port_Moresby"), ), ("Pacific/Rarotonga", include_bytes!("../../../../third_party/tzdb/Pacific/Rarotonga")), ("Pacific/Saipan", include_bytes!("../../../../third_party/tzdb/Pacific/Saipan")), ("Pacific/Samoa", include_bytes!("../../../../third_party/tzdb/Pacific/Samoa")), ("Pacific/Tahiti", include_bytes!("../../../../third_party/tzdb/Pacific/Tahiti")), ("Pacific/Tarawa", include_bytes!("../../../../third_party/tzdb/Pacific/Tarawa")), ("Pacific/Tongatapu", include_bytes!("../../../../third_party/tzdb/Pacific/Tongatapu")), ("Pacific/Wake", include_bytes!("../../../../third_party/tzdb/Pacific/Wake")), ("Pacific/Wallis", include_bytes!("../../../../third_party/tzdb/Pacific/Wallis")), ("Pacific/Yap", include_bytes!("../../../../third_party/tzdb/Pacific/Yap")), ("UTC", include_bytes!("../../../../third_party/tzdb/UTC")), ("posixrules", include_bytes!("../../../../third_party/tzdb/posixrules")), ]; const LEGACY_ALIASES: &[(&str, &str)] = &[ ("Africa/Accra", "Africa/Abidjan"), ("Africa/Addis_Ababa", "Africa/Nairobi"), ("Africa/Asmara", "Africa/Nairobi"), ("Africa/Asmera", "Africa/Nairobi"), ("Africa/Bamako", "Africa/Abidjan"), ("Africa/Bangui", "Africa/Lagos"), ("Africa/Banjul", "Africa/Abidjan"), ("Africa/Blantyre", "Africa/Maputo"), ("Africa/Brazzaville", "Africa/Lagos"), ("Africa/Bujumbura", "Africa/Maputo"), ("Africa/Conakry", "Africa/Abidjan"), ("Africa/Dakar", "Africa/Abidjan"), ("Africa/Dar_es_Salaam", "Africa/Nairobi"), ("Africa/Djibouti", "Africa/Nairobi"), ("Africa/Douala", "Africa/Lagos"), ("Africa/Freetown", "Africa/Abidjan"), ("Africa/Gaborone", "Africa/Maputo"), ("Africa/Harare", "Africa/Maputo"), ("Africa/Kampala", "Africa/Nairobi"), ("Africa/Kigali", "Africa/Maputo"), ("Africa/Kinshasa", "Africa/Lagos"), ("Africa/Libreville", "Africa/Lagos"), ("Africa/Lome", "Africa/Abidjan"), ("Africa/Luanda", "Africa/Lagos"), ("Africa/Lubumbashi", "Africa/Maputo"), ("Africa/Lusaka", "Africa/Maputo"), ("Africa/Malabo", "Africa/Lagos"), ("Africa/Maseru", "Africa/Johannesburg"), ("Africa/Mbabane", "Africa/Johannesburg"), ("Africa/Mogadishu", "Africa/Nairobi"), ("Africa/Niamey", "Africa/Lagos"), ("Africa/Nouakchott", "Africa/Abidjan"), ("Africa/Ouagadougou", "Africa/Abidjan"), ("Africa/Porto-Novo", "Africa/Lagos"), ("Africa/Timbuktu", "Africa/Abidjan"), ("America/Anguilla", "America/Puerto_Rico"), ("America/Antigua", "America/Puerto_Rico"), ("America/Argentina/ComodRivadavia", "America/Argentina/Catamarca"), ("America/Aruba", "America/Puerto_Rico"), ("America/Atikokan", "America/Panama"), ("America/Atka", "America/Adak"), ("America/Blanc-Sablon", "America/Puerto_Rico"), ("America/Buenos_Aires", "America/Argentina/Buenos_Aires"), ("America/Catamarca", "America/Argentina/Catamarca"), ("America/Cayman", "America/Panama"), ("America/Coral_Harbour", "America/Panama"), ("America/Cordoba", "America/Argentina/Cordoba"), ("America/Creston", "America/Phoenix"), ("America/Curacao", "America/Puerto_Rico"), ("America/Dominica", "America/Puerto_Rico"), ("America/Ensenada", "America/Tijuana"), ("America/Fort_Wayne", "America/Indiana/Indianapolis"), ("America/Godthab", "America/Nuuk"), ("America/Grenada", "America/Puerto_Rico"), ("America/Guadeloupe", "America/Puerto_Rico"), ("America/Indianapolis", "America/Indiana/Indianapolis"), ("America/Jujuy", "America/Argentina/Jujuy"), ("America/Knox_IN", "America/Indiana/Knox"), ("America/Kralendijk", "America/Puerto_Rico"), ("America/Louisville", "America/Kentucky/Louisville"), ("America/Lower_Princes", "America/Puerto_Rico"), ("America/Marigot", "America/Puerto_Rico"), ("America/Mendoza", "America/Argentina/Mendoza"), ("America/Montreal", "America/Toronto"), ("America/Montserrat", "America/Puerto_Rico"), ("America/Nassau", "America/Toronto"), ("America/Nipigon", "America/Toronto"), ("America/Pangnirtung", "America/Iqaluit"), ("America/Port_of_Spain", "America/Puerto_Rico"), ("America/Porto_Acre", "America/Rio_Branco"), ("America/Rainy_River", "America/Winnipeg"), ("America/Rosario", "America/Argentina/Cordoba"), ("America/Santa_Isabel", "America/Tijuana"), ("America/Shiprock", "America/Denver"), ("America/St_Barthelemy", "America/Puerto_Rico"), ("America/St_Kitts", "America/Puerto_Rico"), ("America/St_Lucia", "America/Puerto_Rico"), ("America/St_Thomas", "America/Puerto_Rico"), ("America/St_Vincent", "America/Puerto_Rico"), ("America/Thunder_Bay", "America/Toronto"), ("America/Tortola", "America/Puerto_Rico"), ("America/Virgin", "America/Puerto_Rico"), ("America/Yellowknife", "America/Edmonton"), ("Antarctica/DumontDUrville", "Pacific/Port_Moresby"), ("Antarctica/McMurdo", "Pacific/Auckland"), ("Antarctica/South_Pole", "Pacific/Auckland"), ("Antarctica/Syowa", "Asia/Riyadh"), ("Arctic/Longyearbyen", "Europe/Berlin"), ("Asia/Aden", "Asia/Riyadh"), ("Asia/Ashkhabad", "Asia/Ashgabat"), ("Asia/Bahrain", "Asia/Qatar"), ("Asia/Brunei", "Asia/Kuching"), ("Asia/Calcutta", "Asia/Kolkata"), ("Asia/Choibalsan", "Asia/Ulaanbaatar"), ("Asia/Chongqing", "Asia/Shanghai"), ("Asia/Chungking", "Asia/Shanghai"), ("Asia/Dacca", "Asia/Dhaka"), ("Asia/Harbin", "Asia/Shanghai"), ("Asia/Istanbul", "Europe/Istanbul"), ("Asia/Kashgar", "Asia/Urumqi"), ("Asia/Katmandu", "Asia/Kathmandu"), ("Asia/Kuala_Lumpur", "Asia/Singapore"), ("Asia/Kuwait", "Asia/Riyadh"), ("Asia/Macao", "Asia/Macau"), ("Asia/Muscat", "Asia/Dubai"), ("Asia/Phnom_Penh", "Asia/Bangkok"), ("Asia/Rangoon", "Asia/Yangon"), ("Asia/Saigon", "Asia/Ho_Chi_Minh"), ("Asia/Tel_Aviv", "Asia/Jerusalem"), ("Asia/Thimbu", "Asia/Thimphu"), ("Asia/Ujung_Pandang", "Asia/Makassar"), ("Asia/Ulan_Bator", "Asia/Ulaanbaatar"), ("Asia/Vientiane", "Asia/Bangkok"), ("Atlantic/Faeroe", "Atlantic/Faroe"), ("Atlantic/Jan_Mayen", "Europe/Berlin"), ("Atlantic/Reykjavik", "Africa/Abidjan"), ("Atlantic/St_Helena", "Africa/Abidjan"), ("Australia/ACT", "Australia/Sydney"), ("Australia/Canberra", "Australia/Sydney"), ("Australia/Currie", "Australia/Hobart"), ("Australia/LHI", "Australia/Lord_Howe"), ("Australia/NSW", "Australia/Sydney"), ("Australia/North", "Australia/Darwin"), ("Australia/Queensland", "Australia/Brisbane"), ("Australia/South", "Australia/Adelaide"), ("Australia/Tasmania", "Australia/Hobart"), ("Australia/Victoria", "Australia/Melbourne"), ("Australia/West", "Australia/Perth"), ("Australia/Yancowinna", "Australia/Broken_Hill"), ("Brazil/Acre", "America/Rio_Branco"), ("Brazil/DeNoronha", "America/Noronha"), ("Brazil/East", "America/Sao_Paulo"), ("Brazil/West", "America/Manaus"), ("CET", "Europe/Brussels"), ("CST6CDT", "America/Chicago"), ("Canada/Atlantic", "America/Halifax"), ("Canada/Central", "America/Winnipeg"), ("Canada/Eastern", "America/Toronto"), ("Canada/Mountain", "America/Edmonton"), ("Canada/Newfoundland", "America/St_Johns"), ("Canada/Pacific", "America/Vancouver"), ("Canada/Saskatchewan", "America/Regina"), ("Canada/Yukon", "America/Whitehorse"), ("Chile/Continental", "America/Santiago"), ("Chile/EasterIsland", "Pacific/Easter"), ("Cuba", "America/Havana"), ("EET", "Europe/Athens"), ("EST", "America/Panama"), ("EST5EDT", "America/New_York"), ("Egypt", "Africa/Cairo"), ("Eire", "Europe/Dublin"), ("Etc/GMT+0", "Etc/GMT"), ("Etc/GMT-0", "Etc/GMT"), ("Etc/GMT0", "Etc/GMT"), ("Etc/Greenwich", "Etc/GMT"), ("Etc/Ignored", "Etc/UTC"), ("Etc/UCT", "Etc/UTC"), ("Etc/Universal", "Etc/UTC"), ("Etc/Zulu", "Etc/UTC"), ("Europe/Amsterdam", "Europe/Brussels"), ("Europe/Belfast", "Europe/London"), ("Europe/Bratislava", "Europe/Prague"), ("Europe/Busingen", "Europe/Zurich"), ("Europe/Copenhagen", "Europe/Berlin"), ("Europe/Guernsey", "Europe/London"), ("Europe/Isle_of_Man", "Europe/London"), ("Europe/Jersey", "Europe/London"), ("Europe/Kiev", "Europe/Kyiv"), ("Europe/Ljubljana", "Europe/Belgrade"), ("Europe/Luxembourg", "Europe/Brussels"), ("Europe/Mariehamn", "Europe/Helsinki"), ("Europe/Monaco", "Europe/Paris"), ("Europe/Nicosia", "Asia/Nicosia"), ("Europe/Oslo", "Europe/Berlin"), ("Europe/Podgorica", "Europe/Belgrade"), ("Europe/San_Marino", "Europe/Rome"), ("Europe/Sarajevo", "Europe/Belgrade"), ("Europe/Skopje", "Europe/Belgrade"), ("Europe/Stockholm", "Europe/Berlin"), ("Europe/Tiraspol", "Europe/Chisinau"), ("Europe/Uzhgorod", "Europe/Kyiv"), ("Europe/Vaduz", "Europe/Zurich"), ("Europe/Vatican", "Europe/Rome"), ("Europe/Zagreb", "Europe/Belgrade"), ("Europe/Zaporozhye", "Europe/Kyiv"), ("GB", "Europe/London"), ("GB-Eire", "Europe/London"), ("GMT+0", "Etc/GMT"), ("GMT-0", "Etc/GMT"), ("GMT0", "Etc/GMT"), ("Greenwich", "Etc/GMT"), ("HST", "Pacific/Honolulu"), ("Hongkong", "Asia/Hong_Kong"), ("Iceland", "Africa/Abidjan"), ("Indian/Antananarivo", "Africa/Nairobi"), ("Indian/Christmas", "Asia/Bangkok"), ("Indian/Cocos", "Asia/Yangon"), ("Indian/Comoro", "Africa/Nairobi"), ("Indian/Kerguelen", "Indian/Maldives"), ("Indian/Mahe", "Asia/Dubai"), ("Indian/Mayotte", "Africa/Nairobi"), ("Indian/Reunion", "Asia/Dubai"), ("Iran", "Asia/Tehran"), ("Israel", "Asia/Jerusalem"), ("Jamaica", "America/Jamaica"), ("Japan", "Asia/Tokyo"), ("Kwajalein", "Pacific/Kwajalein"), ("Libya", "Africa/Tripoli"), ("MET", "Europe/Brussels"), ("MST", "America/Phoenix"), ("MST7MDT", "America/Denver"), ("Mexico/BajaNorte", "America/Tijuana"), ("Mexico/BajaSur", "America/Mazatlan"), ("Mexico/General", "America/Mexico_City"), ("NZ", "Pacific/Auckland"), ("NZ-CHAT", "Pacific/Chatham"), ("Navajo", "America/Denver"), ("PRC", "Asia/Shanghai"), ("PST8PDT", "America/Los_Angeles"), ("Pacific/Chuuk", "Pacific/Port_Moresby"), ("Pacific/Enderbury", "Pacific/Kanton"), ("Pacific/Funafuti", "Pacific/Tarawa"), ("Pacific/Johnston", "Pacific/Honolulu"), ("Pacific/Majuro", "Pacific/Tarawa"), ("Pacific/Midway", "Pacific/Pago_Pago"), ("Pacific/Pohnpei", "Pacific/Guadalcanal"), ("Pacific/Ponape", "Pacific/Guadalcanal"), ("Pacific/Saipan", "Pacific/Guam"), ("Pacific/Samoa", "Pacific/Pago_Pago"), ("Pacific/Truk", "Pacific/Port_Moresby"), ("Pacific/Wake", "Pacific/Tarawa"), ("Pacific/Wallis", "Pacific/Tarawa"), ("Pacific/Yap", "Pacific/Port_Moresby"), ("Poland", "Europe/Warsaw"), ("Portugal", "Europe/Lisbon"), ("ROC", "Asia/Taipei"), ("ROK", "Asia/Seoul"), ("Singapore", "Asia/Singapore"), ("Turkey", "Europe/Istanbul"), ("UCT", "Etc/UTC"), ("US/Alaska", "America/Anchorage"), ("US/Aleutian", "America/Adak"), ("US/Arizona", "America/Phoenix"), ("US/Central", "America/Chicago"), ("US/East-Indiana", "America/Indiana/Indianapolis"), ("US/Eastern", "America/New_York"), ("US/Hawaii", "Pacific/Honolulu"), ("US/Indiana-Starke", "America/Indiana/Knox"), ("US/Michigan", "America/Detroit"), ("US/Mountain", "America/Denver"), ("US/Pacific", "America/Los_Angeles"), ("US/Samoa", "Pacific/Pago_Pago"), ("UTC", "Etc/UTC"), ("Universal", "Etc/UTC"), ("W-SU", "Europe/Moscow"), ("WET", "Europe/Lisbon"), ("Zulu", "Etc/UTC"), ]; /// 区表：首次使用时解析全部 vendored 区文件，按名排序供二分查找。 struct ZoneTable { zones: Vec<(&'static str, TzifZone)>, } static ZONE_TABLE: LazyLock = LazyLock::new(|| { let mut zones = ZONE_FILES .iter() .filter_map(|(name, bytes)| parse_tzif(bytes).ok().map(|z| (*name, z))) .collect::>(); zones.sort_by(|a, b| a.0.cmp(b.0)); ZoneTable { zones } }); /// 按 IANA 区名（含 legacy 别名）查区数据。 /// /// # 步骤 /// 1. 先解 legacy 别名（`LEGACY_ALIASES` 二分），未命中则原名。 /// 2. 在区表二分查找，命中返回其 `TzifZone`。 /// /// # 边界与前提 /// - 别名只解一层：别名目标是现行区名，不再二次解别名。 /// /// # 注意事项 /// - 首次调用触发全量解析（毫秒级），之后为纯二分。 pub(crate) fn tz_zone_data(name: &str) -> Option<&'static TzifZone> { let target = match LEGACY_ALIASES.binary_search_by(|a| a.0.cmp(name)) { Ok(i) => LEGACY_ALIASES[i].1, Err(_) => name, }; match ZONE_TABLE.zones.binary_search_by(|z| z.0.cmp(target)) { Ok(i) => Some(&ZONE_TABLE.zones[i].1), Err(_) => None, } } /// 按 IANA 区名（含 legacy 别名）查规范区名。 /// /// # 步骤 /// 1. 先解 legacy 别名（`LEGACY_ALIASES` 二分），未命中则原名。 /// 2. 在区表二分查找，命中返回其规范名（`&'static str`）。 /// /// # 边界与前提 /// - 别名只解一层：别名目标是现行区名，不再二次解别名。 pub(crate) fn tz_canonical_name(name: &str) -> Option<&'static str> { let target = match LEGACY_ALIASES.binary_search_by(|a| a.0.cmp(name)) { Ok(i) => LEGACY_ALIASES[i].1, Err(_) => name, }; ZONE_TABLE .zones .binary_search_by(|z| z.0.cmp(target)) .ok() .map(|i| ZONE_TABLE.zones[i].0) } /// 查某区在 `epoch_s`（纪元秒）生效的 UTC 偏移（秒）。 /// /// # 步骤 /// 1. 查区数据，未命中返回 `None`。 /// 2. `partition_point` 找最后一个 `time <= epoch_s` 的 transition： /// 无（早于首个）取 `lmt_offset`，有取该 transition 的偏移。 /// /// # 边界与前提 /// - 早于首个 transition 取 LMT；晚于末个 transition 取末偏移（`last_offset` /// 与末次 transition 一致，故 `partition_point` 已覆盖）。 fn tz_offset_seconds_of(z: &TzifZone, epoch_s: i64) -> i64 { if z.transitions.is_empty() { return i64::from(z.last_offset); } let idx = z.transitions.partition_point(|t| t.0 <= epoch_s); if idx == 0 { i64::from(z.lmt_offset) } else if idx == z.transitions.len() { i64::from(z.last_offset) } else { i64::from(z.transitions[idx - 1].1) } } /// 查某区在 `epoch_s`（纪元秒）生效的 UTC 偏移（秒）。 pub(crate) fn tz_offset_seconds(zone: &str, epoch_s: i64) -> Option { tz_zone_data(zone).map(|z| tz_offset_seconds_of(z, epoch_s)) } /// GetNamedTimeZoneEpochNanoseconds（规范 14.6.3，宿主定义）：墙历时刻的全部候选纪元。 /// /// # 步骤 /// 1. 取墙历（按 UTC 解释）相邻的三个区间偏移：所在区间、下一 transition 后、 /// 上一 transition 前。 /// 2. 对每个偏移 o 构造候选 e = wall - o；校验 e 落在 o 的区间内 /// （offset_at(e) == o），成立才收。 /// 3. 去重升序返回（重叠 = 2 个、间隙 = 0 个、无歧义 = 1 个）。 /// /// # 边界与前提 /// - 区表未命中返回 `None`（调用方决定错误）。 /// - 偏移量域 ±24 小时，有效候选必在墙历（按 UTC 解释）±24 小时内， /// 三个相邻区间覆盖全部候选。 pub(crate) fn named_zone_possible_epoch_ns(zone: &str, wall_ns: i128) -> Option> { let z = tz_zone_data(zone)?; let wall_s = wall_ns.div_euclid(1_000_000_000) as i64; let idx = z.transitions.partition_point(|t| t.0 <= wall_s); let current = if idx == 0 { z.lmt_offset } else { z.transitions[idx - 1].1 }; let mut candidates = Vec::with_capacity(3); let mut consider = |offset: i32| { let candidate = wall_ns - i128::from(offset) * 1_000_000_000; if tz_offset_seconds_of(z, wall_s - i64::from(offset)) == i64::from(offset) { candidates.push(candidate); } }; consider(current); if idx < z.transitions.len() { consider(z.transitions[idx].1); } if idx > 0 { let previous = if idx - 1 == 0 { z.lmt_offset } else { z.transitions[idx - 2].1 }; consider(previous); } candidates.sort_unstable(); candidates.dedup(); Some(candidates) } /// 找 0 候选墙历所落间隙的 transition，返回间隙前后偏移（秒）。 /// /// # 步骤 /// 1. 墙历（按 UTC 解释）在 transition 前区间：查下一 transition 是否正偏移跳变 /// 且墙历落间隙 (t + o_before, t + o_after)。 /// 2. 墙历在 transition 后区间：查上一 transition 同条件。 /// /// # 边界与前提 /// - 区表未命中或墙历不落在任何间隙内返回 `None`（调用方决定错误）。 pub(crate) fn tz_gap_offsets(zone: &str, wall_ns: i128) -> Option<(i64, i64)> { let z = tz_zone_data(zone)?; let wall_s = wall_ns.div_euclid(1_000_000_000) as i64; let idx = z.transitions.partition_point(|t| t.0 <= wall_s); // 墙历在 transition 前区间：间隙由下一 transition 产生。 // 间隙起点（墙历 = t + o_before）候选集为空，计入间隙。 if idx < z.transitions.len() { let (t, offset_after) = z.transitions[idx]; let offset_before = if idx == 0 { z.lmt_offset } else { z.transitions[idx - 1].1 }; if offset_after > offset_before && wall_ns >= i128::from(t) * 1_000_000_000 + i128::from(offset_before) * 1_000_000_000 && wall_ns < i128::from(t) * 1_000_000_000 + i128::from(offset_after) * 1_000_000_000 { return Some((i64::from(offset_before), i64::from(offset_after))); } } // 墙历在 transition 后区间：间隙由上一 transition 产生。 if idx > 0 { let (t, offset_after) = z.transitions[idx - 1]; let offset_before = if idx - 1 == 0 { z.lmt_offset } else { z.transitions[idx - 2].1 }; if offset_after > offset_before && wall_ns >= i128::from(t) * 1_000_000_000 + i128::from(offset_before) * 1_000_000_000 && wall_ns < i128::from(t) * 1_000_000_000 + i128::from(offset_after) * 1_000_000_000 { return Some((i64::from(offset_before), i64::from(offset_after))); } } None } /// 统一时区偏移查找（epoch 依赖）：固定偏移区（数值偏移串）走快速路径恒返常量， /// IANA 区走 transition 表二分。 /// /// # 步骤 /// 1. 数值偏移串（±HH:MM / ±HH / ±HHMM / ±HH:MM:SS）直接解析为秒返回。 /// 2. 未命中走 `tz_offset_seconds`（IANA 区，含 legacy 别名）。 /// /// # 边界与前提 /// - 固定偏移区是 zone-aware 路径的退化情形：偏移与 epoch 无关，恒返回常量。 /// - 非法区名（非数值偏移串且不在区表）返回 `None`。 pub(crate) fn zone_offset_seconds(zone: &str, epoch_s: i64) -> Option { if let Some(offset) = fixed_offset_seconds(zone) { return Some(offset); } tz_offset_seconds(zone, epoch_s) } /// 判断 `name` 是否为可接受的 IANA 区名（含 legacy 别名）。 #[allow(dead_code)] pub(crate) fn tz_is_iana_zone(name: &str) -> bool { tz_zone_data(name).is_some() } /// 查 `epoch_s` 之后（严格大于）的下一个 transition 纪元秒。 #[allow(dead_code)] pub(crate) fn tz_next_transition(zone: &str, epoch_s: i64) -> Option { let z = tz_zone_data(zone)?; z.transitions.iter().find(|t| t.0 > epoch_s).map(|t| t.0) } /// 查 `epoch_s` 之前（严格小于）的上一个 transition 纪元秒。 #[allow(dead_code)] pub(crate) fn tz_prev_transition(zone: &str, epoch_s: i64) -> Option { let z = tz_zone_data(zone)?; z.transitions.iter().rev().find(|t| t.0 < epoch_s).map(|t| t.0) } #[cfg(test)] mod tests { use super::*; /// 两个区名是否解析到同一份区数据（指针恒等）。 fn same_zone(a: &str, b: &str) -> bool { match (tz_zone_data(a), tz_zone_data(b)) { (Some(x), Some(y)) => std::ptr::eq(x as *const _, y as *const _), (None, None) => true, _ => false, } } #[test] fn new_york_1883_lmt_transition() { // 1883 LMT transition（最早 transition，1970 年前，亚分钟 LMT -04:56:02）。 let z = tz_zone_data("America/New_York").unwrap(); assert_eq!(z.transitions[0].0, -2717650800); assert_eq!(z.lmt_offset, -17762); assert_eq!(tz_offset_seconds("America/New_York", -2717650800 - 1), Some(-17762)); assert_eq!(tz_offset_seconds("America/New_York", -2717650800), Some(-18000)); } #[test] fn monrovia_sub_minute_offset() { // 亚分钟偏移 -00:44:30；1970-01-01T12:00-00:44:30 对应纪元 45870 秒。 assert_eq!(tz_offset_seconds("Africa/Monrovia", 45870), Some(-2670)); assert_eq!(tz_offset_seconds("Africa/Monrovia", 0), Some(-2670)); } #[test] fn niue_sub_minute_lmt_transition() { // 1952-10-15T23:59:59-11:19:40（亚分钟 LMT -11:19:40 → -11:20:00）。 assert_eq!(tz_offset_seconds("Pacific/Niue", -543069620 - 1), Some(-40780)); assert_eq!(tz_offset_seconds("Pacific/Niue", -543069620), Some(-40800)); } #[test] fn apia_2011_skip_day() { // 2011-12-30 跳变（24 小时日）：-10:00 → +14:00。 assert_eq!(tz_offset_seconds("Pacific/Apia", 1325239200 - 1), Some(-36000)); assert_eq!(tz_offset_seconds("Pacific/Apia", 1325239200), Some(50400)); } #[test] fn vancouver_2000_dst_start() { // 2000-04-02 DST 开始（23 小时日）：-08:00 → -07:00。 assert_eq!(tz_offset_seconds("America/Vancouver", 954669600 - 1), Some(-28800)); assert_eq!(tz_offset_seconds("America/Vancouver", 954669600), Some(-25200)); } #[test] fn lord_howe_half_hour_dst() { // 半小时 DST：+10:30 → +11:00。 assert_eq!(tz_offset_seconds("Australia/Lord_Howe", 941297400 - 1), Some(37800)); assert_eq!(tz_offset_seconds("Australia/Lord_Howe", 941297400), Some(39600)); } #[test] fn casey_2010_revert_to_utc8() { // 2010-03-05 02:00（+11:00 当地）一次性回到 +08:00，源表为一次性日期而非循环规则。 assert_eq!(tz_offset_seconds("Antarctica/Casey", 1267714800 - 1), Some(39600)); assert_eq!(tz_offset_seconds("Antarctica/Casey", 1267714800), Some(28800)); } #[test] fn riyadh_and_paris_lmt() { // 1850 年 Riyadh LMT +03:06:52；1800 年 Paris LMT +00:09:21。 assert_eq!(tz_offset_seconds("Asia/Riyadh", -3786825600), Some(11212)); assert_eq!(tz_offset_seconds("Europe/Paris", -5364662400), Some(561)); } #[test] fn legacy_alias_hits() { // 语料钉住的 legacy 区名命中别名表，解析到同一区数据（指针恒等）。 assert!(same_zone("Asia/Calcutta", "Asia/Kolkata")); assert!(same_zone("Asia/Katmandu", "Asia/Kathmandu")); assert!(same_zone("Etc/Ignored", "Etc/UTC")); assert!(tz_is_iana_zone("Asia/Calcutta")); assert!(tz_is_iana_zone("Etc/Ignored")); } #[test] fn invalid_zone_returns_none() { // 非法区名返回 None。 assert!(tz_zone_data("Mars/Olympus_Mons").is_none()); assert_eq!(tz_offset_seconds("Not/AZone", 0), None); assert!(!tz_is_iana_zone("Not/AZone")); assert_eq!(tz_next_transition("Not/AZone", 0), None); assert_eq!(tz_prev_transition("Not/AZone", 0), None); } #[test] fn next_and_prev_transition() { // transition 前后边界。 assert_eq!(tz_next_transition("Pacific/Apia", 1325239200 - 1), Some(1325239200)); assert_eq!(tz_prev_transition("Pacific/Apia", 1325239200), Some(1316872800)); assert_eq!(tz_prev_transition("Pacific/Apia", -2445424384), None); assert_eq!(tz_next_transition("Etc/UTC", 0), None); } #[test] fn parse_tzif_version_header() { // 版本头：魔数 / 版本字节 / 截断 / 非法版本。 assert!(matches!(parse_tzif(b"TZif"), Err(TzifError::Truncated))); let mut bad_magic = b"XZif2".to_vec(); bad_magic.extend_from_slice(&[0u8; 39]); assert!(matches!(parse_tzif(&bad_magic), Err(TzifError::BadMagic))); let mut bad_ver = b"TZif".to_vec(); bad_ver.push(b'9'); bad_ver.extend_from_slice(&[0u8; 40]); assert!(matches!(parse_tzif(&bad_ver), Err(TzifError::BadVersion))); } }