X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/libsecurity_utilities/lib/timeflow.h

diff --git a/libsecurity_utilities/lib/timeflow.h b/libsecurity_utilities/lib/timeflow.h
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--- a/libsecurity_utilities/lib/timeflow.h
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-/*
- * Copyright (c) 2000-2001,2003-2004 Apple Computer, 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