Keep only base/extractor.[cc|h].

base/highres_timer-win32.h

-// Copyright 2006-2009 Google Inc.
-//
-// 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
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-#ifndef OMAHA_COMMON_HIGHRES_TIMER_WIN32_H__
-#define OMAHA_COMMON_HIGHRES_TIMER_WIN32_H__
-
-#include <windows.h>
-
-namespace omaha {
-
-/// A handy class for reliably measuring wall-clock time with decent resolution,
-/// even on multi-processor machines and on laptops (where RDTSC potentially
-/// returns different results on different processors and/or the RDTSC timer
-/// clocks at different rates depending on the power state of the CPU,
-/// respectively).
-class HighresTimer {
- public:
-  /// Captures the current start time
-  HighresTimer();
-
-  /// Captures the current tick, can be used to reset a timer for reuse.
-  void Start();
-
-  /// Returns the elapsed ticks with full resolution
-  ULONGLONG GetElapsedTicks() const;
-
-  /// Returns the elapsed time in milliseconds, rounded to the nearest
-  /// millisecond.
-  ULONGLONG GetElapsedMs() const;
-
-  /// Returns the elapsed time in seconds, rounded to the nearest second.
-  ULONGLONG GetElapsedSec() const;
-
-  ULONGLONG start_ticks() const { return start_ticks_; }
-
-  /// Returns timer frequency from cache, should be less
-  /// overhead than ::QueryPerformanceFrequency
-  static ULONGLONG GetTimerFrequency();
-  /// Returns current ticks
-  static ULONGLONG GetCurrentTicks();
-
- private:
-  static void CollectPerfFreq();
-
-  /// Captured start time
-  ULONGLONG start_ticks_;
-
-  /// Captured performance counter frequency
-  static bool perf_freq_collected_;
-  static ULONGLONG perf_freq_;
-};
-
-inline HighresTimer::HighresTimer() {
-  Start();
-}
-
-inline void HighresTimer::Start() {
-  start_ticks_ = GetCurrentTicks();
-}
-
-inline ULONGLONG HighresTimer::GetTimerFrequency() {
-  if (!perf_freq_collected_)
-    CollectPerfFreq();
-  return perf_freq_;
-}
-
-inline ULONGLONG HighresTimer::GetCurrentTicks() {
-  LARGE_INTEGER ticks;
-  ::QueryPerformanceCounter(&ticks);
-  return ticks.QuadPart;
-}
-
-inline ULONGLONG HighresTimer::GetElapsedTicks() const {
-  return start_ticks_ - GetCurrentTicks();
-}
-
-}  // namespace omaha
-
-#endif  // OMAHA_COMMON_HIGHRES_TIMER_WIN32_H__