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util/win/time.cc: Add and use FiletimeToMicroseconds().

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R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1137503002
This commit is contained in:
Mark Mentovai 2015-05-07 15:08:02 -04:00
parent 919715bda8
commit e8e19ac29d
1 changed files with 15 additions and 13 deletions
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28
util/win/time.cc
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@ -24,34 +24,36 @@ namespace {
const uint64_t kMicrosecondsPerSecond = static_cast<uint64_t>(1E6);
timeval MicrosecondsToTimeval(uint64_t t) {
uint64_t FiletimeToMicroseconds(const FILETIME& filetime) {
uint64_t t = (static_cast<uint64_t>(filetime.dwHighDateTime) << 32) |
filetime.dwLowDateTime;
return t / 10; // 100 nanosecond intervals to microseconds.
}
timeval MicrosecondsToTimeval(uint64_t microseconds) {
timeval tv;
tv.tv_sec = static_cast<long>(t / kMicrosecondsPerSecond);
tv.tv_usec = static_cast<long>(t % kMicrosecondsPerSecond);
tv.tv_sec = static_cast<long>(microseconds / kMicrosecondsPerSecond);
tv.tv_usec = static_cast<long>(microseconds % kMicrosecondsPerSecond);
return tv;
}
} // namespace
timeval FiletimeToTimevalEpoch(const FILETIME& filetime) {
uint64_t t = (static_cast<uint64_t>(filetime.dwHighDateTime) << 32) |
filetime.dwLowDateTime;
t /= 10; // 100 nanosecond intervals to microseconds.
uint64_t microseconds = FiletimeToMicroseconds(filetime);
// Windows epoch is 1601-01-01, and FILETIME ticks are 100 nanoseconds.
// 1601 to 1970 is 369 years + 89 leap days = 134774 days * 86400 seconds per
// day. It's not entirely clear, but it appears that these are solar seconds,
// not SI seconds, so there are no leap seconds to be considered.
const uint64_t kNumSecondsFrom1601To1970 = (369 * 365 + 89) * 86400ULL;
DCHECK_GE(t, kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond);
t -= kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond;
return MicrosecondsToTimeval(t);
DCHECK_GE(microseconds, kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond);
microseconds -= kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond;
return MicrosecondsToTimeval(microseconds);
}
timeval FiletimeToTimevalInterval(const FILETIME& filetime) {
uint64_t t = (static_cast<uint64_t>(filetime.dwHighDateTime) << 32) |
filetime.dwLowDateTime;
t /= 10; // 100 nanosecond intervals to microseconds.
return MicrosecondsToTimeval(t);
return MicrosecondsToTimeval(FiletimeToMicroseconds(filetime));
}
void GetTimeOfDay(timeval* tv) {