+++ /dev/null
-/*
- * Copyright (c) 2000-2001,2003-2004,2011,2014 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-
-//
-// timeflow - abstract view of the flow of time
-//
-// We happily publish both absolute and relative times as floating-point values.
-// Absolute times are off the UNIX Epoch (1/1/1970, midnight). This leaves us about
-// microsecond resolution in Modern Times.
-//
-#ifndef _H_TIMEFLOW
-#define _H_TIMEFLOW
-
-#include <sys/time.h>
-#include <limits.h>
-#include <math.h> // for MAXFLOAT
-
-
-namespace Security {
-namespace Time {
-
-
-//
-// A Time::Interval is a time difference (distance).
-//
-class Interval {
- friend class Absolute;
-public:
- Interval() { }
- Interval(int seconds) { mValue = seconds; }
- Interval(double seconds) { mValue = seconds; }
- explicit Interval(time_t seconds) { mValue = seconds; }
-
- Interval &operator += (Interval rel) { mValue += rel.mValue; return *this; }
- Interval &operator -= (Interval rel) { mValue -= rel.mValue; return *this; }
- Interval &operator *= (double f) { mValue *= f; return *this; }
- Interval &operator /= (double f) { mValue /= f; return *this; }
-
- bool operator < (Interval other) const { return mValue < other.mValue; }
- bool operator <= (Interval other) const { return mValue <= other.mValue; }
- bool operator > (Interval other) const { return mValue > other.mValue; }
- bool operator >= (Interval other) const { return mValue >= other.mValue; }
- bool operator == (Interval other) const { return mValue == other.mValue; }
- bool operator != (Interval other) const { return mValue != other.mValue; }
-
- // express as (fractions of) seconds, milliseconds, or microseconds
- double seconds() const { return mValue; }
- double mSeconds() const { return mValue * 1E3; }
- double uSeconds() const { return mValue * 1E6; }
-
- // struct timeval is sometimes used for time intervals, but not often - so be explicit
- struct timeval timevalInterval() const;
-
-private:
- double mValue;
-};
-
-
-//
-// A Time::Absolute is a moment in time.
-//
-class Absolute {
- friend class Interval;
- friend Interval operator - (Absolute, Absolute);
- friend Absolute now();
- friend Absolute bigBang();
- friend Absolute heatDeath();
-public:
- Absolute() { } // uninitialized
- Absolute(time_t t) { mValue = t; } // from time_t
- Absolute(const struct timeval &tv); // from timeval
- Absolute(const struct timespec &ts); // from timespec
-
- // *crement operators
- Absolute &operator += (Interval rel) { mValue += rel.mValue; return *this; }
- Absolute &operator -= (Interval rel) { mValue -= rel.mValue; return *this; }
-
- // comparisons
- bool operator < (Absolute other) const { return mValue < other.mValue; }
- bool operator <= (Absolute other) const { return mValue <= other.mValue; }
- bool operator > (Absolute other) const { return mValue > other.mValue; }
- bool operator >= (Absolute other) const { return mValue >= other.mValue; }
- bool operator == (Absolute other) const { return mValue == other.mValue; }
- bool operator != (Absolute other) const { return mValue != other.mValue; }
-
- // express as conventional (absolute!) time measures
- operator struct timeval() const;
- operator struct timespec() const;
- operator time_t () const { return time_t(mValue); }
-
- // internal form for debugging ONLY
- double internalForm() const { return mValue; }
-
-private:
- double mValue;
-
- Absolute(double value) : mValue(value) { }
-};
-
-
-//
-// Time::now produces the current time
-//
-Absolute now(); // get "now"
-
-
-//
-// Time::resolution(when) gives a conservative estimate of the available resolution
-// at a given time.
-//
-Interval resolution(Absolute at); // estimate available resolution at given time
-
-
-//
-// Some useful "constants"
-//
-inline Absolute bigBang() { return -MAXFLOAT; }
-inline Absolute heatDeath() { return +MAXFLOAT; }
-
-
-
-//
-// More inline arithmetic
-//
-inline Interval operator + (Interval r, Interval r2) { r += r2; return r; }
-inline Interval operator - (Interval r, Interval r2) { r -= r2; return r; }
-inline Interval operator * (Interval r, double f) { r *= f; return r; }
-inline Interval operator / (Interval r, double f) { r /= f; return r; }
-
-inline Absolute operator + (Absolute a, Interval r) { return a += r; }
-inline Absolute operator + (Interval r, Absolute a) { return a += r; }
-inline Absolute operator - (Absolute a, Interval r) { return a -= r; }
-
-inline Interval operator - (Absolute t1, Absolute t0)
-{ return t1.mValue - t0.mValue; }
-
-
-} // end namespace Time
-} // end namespace Security
-
-#endif //_H_TIMEFLOW
projects / apple / security.git / blobdiff