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-rw-r--r--absl/time/internal/cctz/src/time_zone_info.cc74
1 files changed, 47 insertions, 27 deletions
diff --git a/absl/time/internal/cctz/src/time_zone_info.cc b/absl/time/internal/cctz/src/time_zone_info.cc
index cdd11810..bf73635d 100644
--- a/absl/time/internal/cctz/src/time_zone_info.cc
+++ b/absl/time/internal/cctz/src/time_zone_info.cc
@@ -186,14 +186,13 @@ bool TimeZoneInfo::ResetToBuiltinUTC(const seconds& offset) {
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
@@ -203,6 +202,8 @@ bool TimeZoneInfo::ResetToBuiltinUTC(const 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()));
@@ -519,6 +520,13 @@ 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).
@@ -605,6 +613,10 @@ 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(
@@ -654,14 +666,15 @@ 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(
@@ -669,6 +682,7 @@ 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"}) {
@@ -678,6 +692,7 @@ 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;
@@ -698,13 +713,13 @@ 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
@@ -722,9 +737,7 @@ 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());
@@ -885,17 +898,20 @@ 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<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();
@@ -904,22 +920,24 @@ bool TimeZoneInfo::NextTransition(time_point<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<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();
@@ -928,11 +946,12 @@ bool TimeZoneInfo::PrevTransition(time_point<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
@@ -940,14 +959,15 @@ bool TimeZoneInfo::PrevTransition(time_point<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;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-31 08:49:45 +0000