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// Copyright 2017 The Abseil Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/time/internal/test_util.h"
#include <algorithm>
#include <cstddef>
#include <cstring>
#include "absl/base/internal/raw_logging.h"
#include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
namespace cctz = absl::time_internal::cctz;
namespace absl {
namespace time_internal {
TimeZone LoadTimeZone(const std::string& name) {
TimeZone tz;
ABSL_RAW_CHECK(LoadTimeZone(name, &tz), name.c_str());
return tz;
} // namespace time_internal
} // namespace absl
namespace absl {
namespace time_internal {
namespace cctz_extension {
namespace {
// Embed the zoneinfo data for time zones used during tests and benchmarks.
// The data was generated using "xxd -i zoneinfo-file". There is no need
// to update the data as long as the tests do not depend on recent changes
// (and the past rules remain the same).
#include "absl/time/internal/"
const struct ZoneInfo {
const char* name;
const char* data;
std::size_t length;
} kZoneInfo[] = {
// The three real time zones used by :time_test and :time_benchmark.
{"America/Los_Angeles", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
{"America/New_York", //
reinterpret_cast<char*>(America_New_York), America_New_York_len},
{"Australia/Sydney", //
reinterpret_cast<char*>(Australia_Sydney), Australia_Sydney_len},
// Other zones named in tests but which should fail to load.
{"Invalid/TimeZone", nullptr, 0},
{"", nullptr, 0},
// Also allow for loading the local time zone under TZ=US/Pacific.
{"US/Pacific", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
// Allows use of the local time zone from a system-specific location.
#ifdef _MSC_VER
{"localtime", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
{"/etc/localtime", //
reinterpret_cast<char*>(America_Los_Angeles), America_Los_Angeles_len},
class TestZoneInfoSource : public cctz::ZoneInfoSource {
TestZoneInfoSource(const char* data, std::size_t size)
: data_(data), end_(data + size) {}
std::size_t Read(void* ptr, std::size_t size) override {
const std::size_t len = std::min<std::size_t>(size, end_ - data_);
memcpy(ptr, data_, len);
data_ += len;
return len;
int Skip(std::size_t offset) override {
data_ += std::min<std::size_t>(offset, end_ - data_);
return 0;
const char* data_;
const char* const end_;
std::unique_ptr<cctz::ZoneInfoSource> TestFactory(
const std::string& name,
const std::function<std::unique_ptr<cctz::ZoneInfoSource>(
const std::string& name)>& /*fallback_factory*/) {
for (const ZoneInfo& zoneinfo : kZoneInfo) {
if (name == {
if ( == nullptr) return nullptr;
return std::unique_ptr<cctz::ZoneInfoSource>(
new TestZoneInfoSource(, zoneinfo.length));
ABSL_RAW_LOG(FATAL, "Unexpected time zone \"%s\" in test", name.c_str());
return nullptr;
} // namespace
ZoneInfoSourceFactory zone_info_source_factory = TestFactory;
} // namespace cctz_extension
} // namespace time_internal
} // namespace absl