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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/time.h"
#include <math.h>
#if defined(OS_WIN)
#include <float.h>
#endif
#include <limits>
#include "base/sys_string_conversions.h"
#include "base/third_party/nspr/prtime.h"
#include "base/logging.h"
namespace base {
namespace {
#if defined(OS_WIN)
inline bool isnan(double num) { return !!_isnan(num); }
#endif
}
// TimeDelta ------------------------------------------------------------------
int TimeDelta::InDays() const {
return static_cast<int>(delta_ / Time::kMicrosecondsPerDay);
}
int TimeDelta::InHours() const {
return static_cast<int>(delta_ / Time::kMicrosecondsPerHour);
}
int TimeDelta::InMinutes() const {
return static_cast<int>(delta_ / Time::kMicrosecondsPerMinute);
}
double TimeDelta::InSecondsF() const {
return static_cast<double>(delta_) / Time::kMicrosecondsPerSecond;
}
int64 TimeDelta::InSeconds() const {
return delta_ / Time::kMicrosecondsPerSecond;
}
double TimeDelta::InMillisecondsF() const {
return static_cast<double>(delta_) / Time::kMicrosecondsPerMillisecond;
}
int64 TimeDelta::InMilliseconds() const {
return delta_ / Time::kMicrosecondsPerMillisecond;
}
int64 TimeDelta::InMillisecondsRoundedUp() const {
return (delta_ + Time::kMicrosecondsPerMillisecond - 1) /
Time::kMicrosecondsPerMillisecond;
}
int64 TimeDelta::InMicroseconds() const {
return delta_;
}
// Time -----------------------------------------------------------------------
// static
Time Time::Max() {
return Time(std::numeric_limits<int64>::max());
}
// static
Time Time::FromTimeT(time_t tt) {
if (tt == 0)
return Time(); // Preserve 0 so we can tell it doesn't exist.
if (tt == std::numeric_limits<time_t>::max())
return Max();
return Time((tt * kMicrosecondsPerSecond) + kTimeTToMicrosecondsOffset);
}
time_t Time::ToTimeT() const {
if (is_null())
return 0; // Preserve 0 so we can tell it doesn't exist.
if (is_max()) {
// Preserve max without offset to prevent overflow.
return std::numeric_limits<time_t>::max();
}
if (std::numeric_limits<int64>::max() - kTimeTToMicrosecondsOffset <= us_) {
DLOG(WARNING) << "Overflow when converting base::Time with internal " <<
"value " << us_ << " to time_t.";
return std::numeric_limits<time_t>::max();
}
return (us_ - kTimeTToMicrosecondsOffset) / kMicrosecondsPerSecond;
}
// static
Time Time::FromDoubleT(double dt) {
if (dt == 0 || isnan(dt))
return Time(); // Preserve 0 so we can tell it doesn't exist.
if (dt == std::numeric_limits<double>::max())
return Max();
return Time(static_cast<int64>((dt *
static_cast<double>(kMicrosecondsPerSecond)) +
kTimeTToMicrosecondsOffset));
}
double Time::ToDoubleT() const {
if (is_null())
return 0; // Preserve 0 so we can tell it doesn't exist.
if (is_max()) {
// Preserve max without offset to prevent overflow.
return std::numeric_limits<double>::max();
}
return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
static_cast<double>(kMicrosecondsPerSecond));
}
// static
Time Time::FromJsTime(double ms_since_epoch) {
// The epoch is a valid time, so this constructor doesn't interpret
// 0 as the null time.
if (ms_since_epoch == std::numeric_limits<double>::max())
return Max();
return Time(static_cast<int64>(ms_since_epoch * kMicrosecondsPerMillisecond) +
kTimeTToMicrosecondsOffset);
}
double Time::ToJsTime() const {
if (is_null()) {
// Preserve 0 so the invalid result doesn't depend on the platform.
return 0;
}
if (is_max()) {
// Preserve max without offset to prevent overflow.
return std::numeric_limits<double>::max();
}
return (static_cast<double>(us_ - kTimeTToMicrosecondsOffset) /
kMicrosecondsPerMillisecond);
}
// static
Time Time::UnixEpoch() {
Time time;
time.us_ = kTimeTToMicrosecondsOffset;
return time;
}
Time Time::LocalMidnight() const {
Exploded exploded;
LocalExplode(&exploded);
exploded.hour = 0;
exploded.minute = 0;
exploded.second = 0;
exploded.millisecond = 0;
return FromLocalExploded(exploded);
}
// static
bool Time::FromStringInternal(const char* time_string,
bool is_local,
Time* parsed_time) {
DCHECK((time_string != NULL) && (parsed_time != NULL));
if (time_string[0] == '\0')
return false;
PRTime result_time = 0;
PRStatus result = PR_ParseTimeString(time_string,
is_local ? PR_FALSE : PR_TRUE,
&result_time);
if (PR_SUCCESS != result)
return false;
result_time += kTimeTToMicrosecondsOffset;
*parsed_time = Time(result_time);
return true;
}
// Time::Exploded -------------------------------------------------------------
inline bool is_in_range(int value, int lo, int hi) {
return lo <= value && value <= hi;
}
bool Time::Exploded::HasValidValues() const {
return is_in_range(month, 1, 12) &&
is_in_range(day_of_week, 0, 6) &&
is_in_range(day_of_month, 1, 31) &&
is_in_range(hour, 0, 23) &&
is_in_range(minute, 0, 59) &&
is_in_range(second, 0, 60) &&
is_in_range(millisecond, 0, 999);
}
} // namespace base
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