94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
// Copyright 2015 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/misc/time.h"
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#include <stdint.h>
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#include "base/check_op.h"
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namespace crashpad {
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namespace {
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constexpr uint64_t kMicrosecondsPerSecond = static_cast<uint64_t>(1E6);
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constexpr uint64_t kNanosecondsPerFiletimeInterval = static_cast<uint64_t>(100);
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constexpr uint64_t kFiletimeIntervalsPerSecond =
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kNanosecondsPerSecond / kNanosecondsPerFiletimeInterval;
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constexpr uint64_t kFiletimeIntervalsPerMicrosecond =
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kFiletimeIntervalsPerSecond / kMicrosecondsPerSecond;
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// Windows epoch is 1601-01-01, and FILETIME ticks are 100 nanoseconds.
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// 1601 to 1970 is 369 years + 89 leap days = 134774 days * 86400 seconds per
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// day. It's not entirely clear, but it appears that these are solar seconds,
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// not SI seconds, so there are no leap seconds to be considered.
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constexpr uint64_t kNumSecondsFrom1601To1970 = (369 * 365 + 89) * 86400ULL;
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uint64_t FiletimeToMicroseconds(const FILETIME& filetime) {
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uint64_t t = (static_cast<uint64_t>(filetime.dwHighDateTime) << 32) |
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filetime.dwLowDateTime;
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return t / kFiletimeIntervalsPerMicrosecond;
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}
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timeval MicrosecondsToTimeval(uint64_t microseconds) {
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timeval tv;
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tv.tv_sec = static_cast<long>(microseconds / kMicrosecondsPerSecond);
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tv.tv_usec = static_cast<long>(microseconds % kMicrosecondsPerSecond);
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return tv;
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}
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} // namespace
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FILETIME TimespecToFiletimeEpoch(const timespec& ts) {
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uint64_t intervals =
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(kNumSecondsFrom1601To1970 + ts.tv_sec) * kFiletimeIntervalsPerSecond +
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ts.tv_nsec / kNanosecondsPerFiletimeInterval;
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FILETIME filetime;
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filetime.dwLowDateTime = intervals & 0xffffffff;
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filetime.dwHighDateTime = intervals >> 32;
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return filetime;
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}
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timespec FiletimeToTimespecEpoch(const FILETIME& filetime) {
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uint64_t intervals =
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(uint64_t{filetime.dwHighDateTime} << 32) | filetime.dwLowDateTime;
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timespec result;
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result.tv_sec =
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(intervals / kFiletimeIntervalsPerSecond) - kNumSecondsFrom1601To1970;
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result.tv_nsec =
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static_cast<long>(intervals % kFiletimeIntervalsPerSecond) *
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kNanosecondsPerFiletimeInterval;
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return result;
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}
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timeval FiletimeToTimevalEpoch(const FILETIME& filetime) {
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uint64_t microseconds = FiletimeToMicroseconds(filetime);
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DCHECK_GE(microseconds, kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond);
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microseconds -= kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond;
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return MicrosecondsToTimeval(microseconds);
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}
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timeval FiletimeToTimevalInterval(const FILETIME& filetime) {
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return MicrosecondsToTimeval(FiletimeToMicroseconds(filetime));
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}
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void GetTimeOfDay(timeval* tv) {
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FILETIME filetime;
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GetSystemTimeAsFileTime(&filetime);
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*tv = FiletimeToTimevalEpoch(filetime);
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}
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} // namespace crashpad
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