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-rw-r--r--absl/time/internal/cctz/src/time_zone_info.cc114
1 files changed, 67 insertions, 47 deletions
diff --git a/absl/time/internal/cctz/src/time_zone_info.cc b/absl/time/internal/cctz/src/time_zone_info.cc
index 7f5a8fad..e19d1d2d 100644
--- a/absl/time/internal/cctz/src/time_zone_info.cc
+++ b/absl/time/internal/cctz/src/time_zone_info.cc
@@ -50,7 +50,7 @@
#include "time_zone_posix.h"
namespace absl {
-inline namespace lts_2018_06_20 {
+inline namespace lts_2018_12_18 {
namespace time_internal {
namespace cctz {
@@ -141,7 +141,7 @@ std::int_fast64_t TransOffset(bool leap_year, int jan1_weekday,
return (days * kSecsPerDay) + pt.time.offset;
}
-inline time_zone::civil_lookup MakeUnique(const time_point<sys_seconds>& tp) {
+inline time_zone::civil_lookup MakeUnique(const time_point<seconds>& tp) {
time_zone::civil_lookup cl;
cl.kind = time_zone::civil_lookup::UNIQUE;
cl.pre = cl.trans = cl.post = tp;
@@ -180,21 +180,20 @@ inline civil_second YearShift(const civil_second& cs, year_t shift) {
} // namespace
// What (no leap-seconds) UTC+seconds zoneinfo would look like.
-bool TimeZoneInfo::ResetToBuiltinUTC(const sys_seconds& offset) {
+bool TimeZoneInfo::ResetToBuiltinUTC(const seconds& offset) {
transition_types_.resize(1);
TransitionType& tt(transition_types_.back());
tt.utc_offset = static_cast<std::int_least32_t>(offset.count());
tt.is_dst = false;
tt.abbr_index = 0;
- // We temporarily add some redundant, contemporary (2012 through 2021)
+ // We temporarily add some redundant, contemporary (2013 through 2023)
// transitions for performance reasons. See TimeZoneInfo::LocalTime().
// TODO: Fix the performance issue and remove the extra transitions.
transitions_.clear();
transitions_.reserve(12);
for (const std::int_fast64_t unix_time : {
-(1LL << 59), // BIG_BANG
- 1325376000LL, // 2012-01-01T00:00:00+00:00
1356998400LL, // 2013-01-01T00:00:00+00:00
1388534400LL, // 2014-01-01T00:00:00+00:00
1420070400LL, // 2015-01-01T00:00:00+00:00
@@ -204,6 +203,8 @@ bool TimeZoneInfo::ResetToBuiltinUTC(const sys_seconds& offset) {
1546300800LL, // 2019-01-01T00:00:00+00:00
1577836800LL, // 2020-01-01T00:00:00+00:00
1609459200LL, // 2021-01-01T00:00:00+00:00
+ 1640995200LL, // 2022-01-01T00:00:00+00:00
+ 1672531200LL, // 2023-01-01T00:00:00+00:00
2147483647LL, // 2^31 - 1
}) {
Transition& tr(*transitions_.emplace(transitions_.end()));
@@ -219,8 +220,8 @@ bool TimeZoneInfo::ResetToBuiltinUTC(const sys_seconds& offset) {
future_spec_.clear(); // never needed for a fixed-offset zone
extended_ = false;
- tt.civil_max = LocalTime(sys_seconds::max().count(), tt).cs;
- tt.civil_min = LocalTime(sys_seconds::min().count(), tt).cs;
+ tt.civil_max = LocalTime(seconds::max().count(), tt).cs;
+ tt.civil_min = LocalTime(seconds::min().count(), tt).cs;
transitions_.shrink_to_fit();
return true;
@@ -286,7 +287,7 @@ bool TimeZoneInfo::EquivTransitions(std::uint_fast8_t tt1_index,
return true;
}
-// Use the POSIX-TZ-environment-variable-style std::string to handle times
+// Use the POSIX-TZ-environment-variable-style string to handle times
// in years after the last transition stored in the zoneinfo data.
void TimeZoneInfo::ExtendTransitions(const std::string& name,
const Header& hdr) {
@@ -520,6 +521,13 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
// We don't check for EOF so that we're forwards compatible.
+ // If we did not find version information during the standard loading
+ // process (as of tzh_version '3' that is unsupported), then ask the
+ // ZoneInfoSource for any out-of-bound version std::string it may be privy to.
+ if (version_.empty()) {
+ version_ = zip->Version();
+ }
+
// Trim redundant transitions. zic may have added these to work around
// differences between the glibc and reference implementations (see
// zic.c:dontmerge) and the Qt library (see zic.c:WORK_AROUND_QTBUG_53071).
@@ -566,10 +574,10 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
}
// Compute the maximum/minimum civil times that can be converted to a
- // time_point<sys_seconds> for each of the zone's transition types.
+ // time_point<seconds> for each of the zone's transition types.
for (auto& tt : transition_types_) {
- tt.civil_max = LocalTime(sys_seconds::max().count(), tt).cs;
- tt.civil_min = LocalTime(sys_seconds::min().count(), tt).cs;
+ tt.civil_max = LocalTime(seconds::max().count(), tt).cs;
+ tt.civil_min = LocalTime(seconds::min().count(), tt).cs;
}
transitions_.shrink_to_fit();
@@ -606,6 +614,10 @@ class FileZoneInfoSource : public ZoneInfoSource {
if (rc == 0) len_ -= offset;
return rc;
}
+ std::string Version() const override {
+ // TODO: It would nice if the zoneinfo data included the tzdb version.
+ return std::string();
+ }
protected:
explicit FileZoneInfoSource(
@@ -655,14 +667,15 @@ std::unique_ptr<ZoneInfoSource> FileZoneInfoSource::Open(
return std::unique_ptr<ZoneInfoSource>(new FileZoneInfoSource(fp, length));
}
-#if defined(__ANDROID__)
class AndroidZoneInfoSource : public FileZoneInfoSource {
public:
static std::unique_ptr<ZoneInfoSource> Open(const std::string& name);
+ std::string Version() const override { return version_; }
private:
- explicit AndroidZoneInfoSource(FILE* fp, std::size_t len)
- : FileZoneInfoSource(fp, len) {}
+ explicit AndroidZoneInfoSource(FILE* fp, std::size_t len, const char* vers)
+ : FileZoneInfoSource(fp, len), version_(vers) {}
+ std::string version_;
};
std::unique_ptr<ZoneInfoSource> AndroidZoneInfoSource::Open(
@@ -670,6 +683,7 @@ std::unique_ptr<ZoneInfoSource> AndroidZoneInfoSource::Open(
// Use of the "file:" prefix is intended for testing purposes only.
if (name.compare(0, 5, "file:") == 0) return Open(name.substr(5));
+#if defined(__ANDROID__)
// See Android's libc/tzcode/bionic.cpp for additional information.
for (const char* tzdata : {"/data/misc/zoneinfo/current/tzdata",
"/system/usr/share/zoneinfo/tzdata"}) {
@@ -679,6 +693,7 @@ std::unique_ptr<ZoneInfoSource> AndroidZoneInfoSource::Open(
char hbuf[24]; // covers header.zonetab_offset too
if (fread(hbuf, 1, sizeof(hbuf), fp.get()) != sizeof(hbuf)) continue;
if (strncmp(hbuf, "tzdata", 6) != 0) continue;
+ const char* vers = (hbuf[11] == '\0') ? hbuf + 6 : "";
const std::int_fast32_t index_offset = Decode32(hbuf + 12);
const std::int_fast32_t data_offset = Decode32(hbuf + 16);
if (index_offset < 0 || data_offset < index_offset) continue;
@@ -699,13 +714,13 @@ std::unique_ptr<ZoneInfoSource> AndroidZoneInfoSource::Open(
if (strcmp(name.c_str(), ebuf) == 0) {
if (fseek(fp.get(), static_cast<long>(start), SEEK_SET) != 0) break;
return std::unique_ptr<ZoneInfoSource>(new AndroidZoneInfoSource(
- fp.release(), static_cast<std::size_t>(length)));
+ fp.release(), static_cast<std::size_t>(length), vers));
}
}
}
+#endif // __ANDROID__
return nullptr;
}
-#endif
} // namespace
@@ -714,7 +729,7 @@ bool TimeZoneInfo::Load(const std::string& name) {
// zone never fails because the simple, fixed-offset state can be
// internally generated. Note that this depends on our choice to not
// accept leap-second encoded ("right") zoneinfo.
- auto offset = sys_seconds::zero();
+ auto offset = seconds::zero();
if (FixedOffsetFromName(name, &offset)) {
return ResetToBuiltinUTC(offset);
}
@@ -723,9 +738,7 @@ bool TimeZoneInfo::Load(const std::string& name) {
auto zip = cctz_extension::zone_info_source_factory(
name, [](const std::string& name) -> std::unique_ptr<ZoneInfoSource> {
if (auto zip = FileZoneInfoSource::Open(name)) return zip;
-#if defined(__ANDROID__)
if (auto zip = AndroidZoneInfoSource::Open(name)) return zip;
-#endif
return nullptr;
});
return zip != nullptr && Load(name, zip.get());
@@ -756,14 +769,14 @@ time_zone::civil_lookup TimeZoneInfo::TimeLocal(const civil_second& cs,
year_t c4_shift) const {
assert(last_year_ - 400 < cs.year() && cs.year() <= last_year_);
time_zone::civil_lookup cl = MakeTime(cs);
- if (c4_shift > sys_seconds::max().count() / kSecsPer400Years) {
- cl.pre = cl.trans = cl.post = time_point<sys_seconds>::max();
+ if (c4_shift > seconds::max().count() / kSecsPer400Years) {
+ cl.pre = cl.trans = cl.post = time_point<seconds>::max();
} else {
- const auto offset = sys_seconds(c4_shift * kSecsPer400Years);
- const auto limit = time_point<sys_seconds>::max() - offset;
+ const auto offset = seconds(c4_shift * kSecsPer400Years);
+ const auto limit = time_point<seconds>::max() - offset;
for (auto* tp : {&cl.pre, &cl.trans, &cl.post}) {
if (*tp > limit) {
- *tp = time_point<sys_seconds>::max();
+ *tp = time_point<seconds>::max();
} else {
*tp += offset;
}
@@ -773,7 +786,7 @@ time_zone::civil_lookup TimeZoneInfo::TimeLocal(const civil_second& cs,
}
time_zone::absolute_lookup TimeZoneInfo::BreakTime(
- const time_point<sys_seconds>& tp) const {
+ const time_point<seconds>& tp) const {
std::int_fast64_t unix_time = ToUnixSeconds(tp);
const std::size_t timecnt = transitions_.size();
assert(timecnt != 0); // We always add a transition.
@@ -789,7 +802,7 @@ time_zone::absolute_lookup TimeZoneInfo::BreakTime(
const std::int_fast64_t diff =
unix_time - transitions_[timecnt - 1].unix_time;
const year_t shift = diff / kSecsPer400Years + 1;
- const auto d = sys_seconds(shift * kSecsPer400Years);
+ const auto d = seconds(shift * kSecsPer400Years);
time_zone::absolute_lookup al = BreakTime(tp - d);
al.cs = YearShift(al.cs, shift * 400);
return al;
@@ -848,7 +861,7 @@ time_zone::civil_lookup TimeZoneInfo::MakeTime(const civil_second& cs) const {
if (tr->prev_civil_sec >= cs) {
// Before first transition, so use the default offset.
const TransitionType& tt(transition_types_[default_transition_type_]);
- if (cs < tt.civil_min) return MakeUnique(time_point<sys_seconds>::min());
+ if (cs < tt.civil_min) return MakeUnique(time_point<seconds>::min());
return MakeUnique(cs - (civil_second() + tt.utc_offset));
}
// tr->prev_civil_sec < cs < tr->civil_sec
@@ -865,7 +878,7 @@ time_zone::civil_lookup TimeZoneInfo::MakeTime(const civil_second& cs) const {
return TimeLocal(YearShift(cs, shift * -400), shift);
}
const TransitionType& tt(transition_types_[tr->type_index]);
- if (cs > tt.civil_max) return MakeUnique(time_point<sys_seconds>::max());
+ if (cs > tt.civil_max) return MakeUnique(time_point<seconds>::max());
return MakeUnique(tr->unix_time + (cs - tr->civil_sec));
}
// tr->civil_sec <= cs <= tr->prev_civil_sec
@@ -886,17 +899,20 @@ time_zone::civil_lookup TimeZoneInfo::MakeTime(const civil_second& cs) const {
return MakeUnique(tr->unix_time + (cs - tr->civil_sec));
}
+std::string TimeZoneInfo::Version() const {
+ return version_;
+}
+
std::string TimeZoneInfo::Description() const {
std::ostringstream oss;
- // TODO: It would nice if the zoneinfo data included the zone name.
- // TODO: It would nice if the zoneinfo data included the tzdb version.
oss << "#trans=" << transitions_.size();
oss << " #types=" << transition_types_.size();
oss << " spec='" << future_spec_ << "'";
return oss.str();
}
-bool TimeZoneInfo::NextTransition(time_point<sys_seconds>* tp) const {
+bool TimeZoneInfo::NextTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const {
if (transitions_.empty()) return false;
const Transition* begin = &transitions_[0];
const Transition* end = begin + transitions_.size();
@@ -905,22 +921,24 @@ bool TimeZoneInfo::NextTransition(time_point<sys_seconds>* tp) const {
// really a sentinel, not a transition. See tz/zic.c.
++begin;
}
- std::int_fast64_t unix_time = ToUnixSeconds(*tp);
+ std::int_fast64_t unix_time = ToUnixSeconds(tp);
const Transition target = { unix_time };
const Transition* tr = std::upper_bound(begin, end, target,
Transition::ByUnixTime());
- if (tr != begin) { // skip no-op transitions
- for (; tr != end; ++tr) {
- if (!EquivTransitions(tr[-1].type_index, tr[0].type_index)) break;
- }
+ for (; tr != end; ++tr) { // skip no-op transitions
+ std::uint_fast8_t prev_type_index =
+ (tr == begin) ? default_transition_type_ : tr[-1].type_index;
+ if (!EquivTransitions(prev_type_index, tr[0].type_index)) break;
}
// When tr == end we return false, ignoring future_spec_.
if (tr == end) return false;
- *tp = FromUnixSeconds(tr->unix_time);
+ trans->from = tr->prev_civil_sec + 1;
+ trans->to = tr->civil_sec;
return true;
}
-bool TimeZoneInfo::PrevTransition(time_point<sys_seconds>* tp) const {
+bool TimeZoneInfo::PrevTransition(const time_point<seconds>& tp,
+ time_zone::civil_transition* trans) const {
if (transitions_.empty()) return false;
const Transition* begin = &transitions_[0];
const Transition* end = begin + transitions_.size();
@@ -929,11 +947,12 @@ bool TimeZoneInfo::PrevTransition(time_point<sys_seconds>* tp) const {
// really a sentinel, not a transition. See tz/zic.c.
++begin;
}
- std::int_fast64_t unix_time = ToUnixSeconds(*tp);
- if (FromUnixSeconds(unix_time) != *tp) {
+ std::int_fast64_t unix_time = ToUnixSeconds(tp);
+ if (FromUnixSeconds(unix_time) != tp) {
if (unix_time == std::numeric_limits<std::int_fast64_t>::max()) {
if (end == begin) return false; // Ignore future_spec_.
- *tp = FromUnixSeconds((--end)->unix_time);
+ trans->from = (--end)->prev_civil_sec + 1;
+ trans->to = end->civil_sec;
return true;
}
unix_time += 1; // ceils
@@ -941,18 +960,19 @@ bool TimeZoneInfo::PrevTransition(time_point<sys_seconds>* tp) const {
const Transition target = { unix_time };
const Transition* tr = std::lower_bound(begin, end, target,
Transition::ByUnixTime());
- if (tr != begin) { // skip no-op transitions
- for (; tr - 1 != begin; --tr) {
- if (!EquivTransitions(tr[-2].type_index, tr[-1].type_index)) break;
- }
+ for (; tr != begin; --tr) { // skip no-op transitions
+ std::uint_fast8_t prev_type_index =
+ (tr - 1 == begin) ? default_transition_type_ : tr[-2].type_index;
+ if (!EquivTransitions(prev_type_index, tr[-1].type_index)) break;
}
// When tr == end we return the "last" transition, ignoring future_spec_.
if (tr == begin) return false;
- *tp = FromUnixSeconds((--tr)->unix_time);
+ trans->from = (--tr)->prev_civil_sec + 1;
+ trans->to = tr->civil_sec;
return true;
}
} // namespace cctz
} // namespace time_internal
-} // inline namespace lts_2018_06_20
+} // inline namespace lts_2018_12_18
} // namespace absl
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-15 10:28:03 +0000