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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
- **********************************************************************
- * Copyright (c) 2003-2008, International Business Machines
- * Corporation and others.  All Rights Reserved.
- **********************************************************************
- * Author: Alan Liu
- * Created: September 2 2003
- * Since: ICU 2.8
- **********************************************************************
- */
-
-#ifndef GREGOIMP_H
-#define GREGOIMP_H
-#include "unicode/utypes.h"
-#if !UCONFIG_NO_FORMATTING
-
-#include "unicode/ures.h"
-#include "unicode/locid.h"
-#include "putilimp.h"
-
-U_NAMESPACE_BEGIN
-
-/**
- * A utility class providing mathematical functions used by time zone
- * and calendar code.  Do not instantiate.  Formerly just named 'Math'.
- * @internal
- */
-class ClockMath {
- public:
-    /**
-     * Divide two integers, returning the floor of the quotient.
-     * Unlike the built-in division, this is mathematically
-     * well-behaved.  E.g., <code>-1/4</code> => 0 but
-     * <code>floorDivide(-1,4)</code> => -1.
-     * @param numerator the numerator
-     * @param denominator a divisor which must be != 0
-     * @return the floor of the quotient
-     */
-    static int32_t floorDivide(int32_t numerator, int32_t denominator);
-
-    /**
-     * Divide two integers, returning the floor of the quotient.
-     * Unlike the built-in division, this is mathematically
-     * well-behaved.  E.g., <code>-1/4</code> => 0 but
-     * <code>floorDivide(-1,4)</code> => -1.
-     * @param numerator the numerator
-     * @param denominator a divisor which must be != 0
-     * @return the floor of the quotient
-     */
-    static int64_t floorDivide(int64_t numerator, int64_t denominator);
-
-    /**
-     * Divide two numbers, returning the floor of the quotient.
-     * Unlike the built-in division, this is mathematically
-     * well-behaved.  E.g., <code>-1/4</code> => 0 but
-     * <code>floorDivide(-1,4)</code> => -1.
-     * @param numerator the numerator
-     * @param denominator a divisor which must be != 0
-     * @return the floor of the quotient
-     */
-    static inline double floorDivide(double numerator, double denominator);
-
-    /**
-     * Divide two numbers, returning the floor of the quotient and
-     * the modulus remainder.  Unlike the built-in division, this is
-     * mathematically well-behaved.  E.g., <code>-1/4</code> => 0 and
-     * <code>-1%4</code> => -1, but <code>floorDivide(-1,4)</code> =>
-     * -1 with <code>remainder</code> => 3.  NOTE: If numerator is
-     * too large, the returned quotient may overflow.
-     * @param numerator the numerator
-     * @param denominator a divisor which must be != 0
-     * @param remainder output parameter to receive the
-     * remainder. Unlike <code>numerator % denominator</code>, this
-     * will always be non-negative, in the half-open range <code>[0,
-     * |denominator|)</code>.
-     * @return the floor of the quotient
-     */
-    static int32_t floorDivide(double numerator, int32_t denominator,
-                               int32_t& remainder);
-
-    /**
-     * For a positive divisor, return the quotient and remainder
-     * such that dividend = quotient*divisor + remainder and
-     * 0 <= remainder < divisor.
-     *
-     * Works around edge-case bugs.  Handles pathological input
-     * (divident >> divisor) reasonably.
-     *
-     * Calling with a divisor <= 0 is disallowed.
-     */
-    static double floorDivide(double dividend, double divisor,
-                              double& remainder);
-};
-
-// Useful millisecond constants
-#define kOneDay    (1.0 * U_MILLIS_PER_DAY)       //  86,400,000
-#define kOneHour   (60*60*1000)
-#define kOneMinute 60000
-#define kOneSecond 1000
-#define kOneMillisecond  1
-#define kOneWeek   (7.0 * kOneDay) // 604,800,000
-
-// Epoch constants
-#define kJan1_1JulianDay  1721426 // January 1, year 1 (Gregorian)
-
-#define kEpochStartAsJulianDay  2440588 // January 1, 1970 (Gregorian)
-
-#define kEpochYear              1970
-
-
-#define kEarliestViableMillis  -185331720384000000.0  // minimum representable by julian day  -1e17
-
-#define kLatestViableMillis     185753453990400000.0  // max representable by julian day      +1e17
-
-/**
- * The minimum supported Julian day.  This value is equivalent to
- * MIN_MILLIS.
- */
-#define MIN_JULIAN (-0x7F000000)
-
-/**
- * The minimum supported epoch milliseconds.  This value is equivalent
- * to MIN_JULIAN.
- */
-#define MIN_MILLIS ((MIN_JULIAN - kEpochStartAsJulianDay) * kOneDay)
-
-/**
- * The maximum supported Julian day.  This value is equivalent to
- * MAX_MILLIS.
- */
-#define MAX_JULIAN (+0x7F000000)
-
-/**
- * The maximum supported epoch milliseconds.  This value is equivalent
- * to MAX_JULIAN.
- */
-#define MAX_MILLIS ((MAX_JULIAN - kEpochStartAsJulianDay) * kOneDay)
-
-/**
- * A utility class providing proleptic Gregorian calendar functions
- * used by time zone and calendar code.  Do not instantiate.
- *
- * Note:  Unlike GregorianCalendar, all computations performed by this
- * class occur in the pure proleptic GregorianCalendar.
- */
-class Grego {
- public:
-    /**
-     * Return TRUE if the given year is a leap year.
-     * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
-     * @return TRUE if the year is a leap year
-     */
-    static inline UBool isLeapYear(int32_t year);
-
-    /**
-     * Return the number of days in the given month.
-     * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
-     * @param month 0-based month, with 0==Jan
-     * @return the number of days in the given month
-     */
-    static inline int8_t monthLength(int32_t year, int32_t month);
-
-    /**
-     * Return the length of a previous month of the Gregorian calendar.
-     * @param y the extended year
-     * @param m the 0-based month number
-     * @return the number of days in the month previous to the given month
-     */
-    static inline int8_t previousMonthLength(int y, int m);
-
-    /**
-     * Convert a year, month, and day-of-month, given in the proleptic
-     * Gregorian calendar, to 1970 epoch days.
-     * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
-     * @param month 0-based month, with 0==Jan
-     * @param dom 1-based day of month
-     * @return the day number, with day 0 == Jan 1 1970
-     */
-    static double fieldsToDay(int32_t year, int32_t month, int32_t dom);
-
-    /**
-     * Convert a 1970-epoch day number to proleptic Gregorian year,
-     * month, day-of-month, and day-of-week.
-     * @param day 1970-epoch day (integral value)
-     * @param year output parameter to receive year
-     * @param month output parameter to receive month (0-based, 0==Jan)
-     * @param dom output parameter to receive day-of-month (1-based)
-     * @param dow output parameter to receive day-of-week (1-based, 1==Sun)
-     * @param doy output parameter to receive day-of-year (1-based)
-     */
-    static void dayToFields(double day, int32_t& year, int32_t& month,
-                            int32_t& dom, int32_t& dow, int32_t& doy);
-
-    /**
-     * Convert a 1970-epoch day number to proleptic Gregorian year,
-     * month, day-of-month, and day-of-week.
-     * @param day 1970-epoch day (integral value)
-     * @param year output parameter to receive year
-     * @param month output parameter to receive month (0-based, 0==Jan)
-     * @param dom output parameter to receive day-of-month (1-based)
-     * @param dow output parameter to receive day-of-week (1-based, 1==Sun)
-     */
-    static inline void dayToFields(double day, int32_t& year, int32_t& month,
-                                   int32_t& dom, int32_t& dow);
-
-    /**
-     * Convert a 1970-epoch milliseconds to proleptic Gregorian year,
-     * month, day-of-month, and day-of-week, day of year and millis-in-day.
-     * @param time 1970-epoch milliseconds
-     * @param year output parameter to receive year
-     * @param month output parameter to receive month (0-based, 0==Jan)
-     * @param dom output parameter to receive day-of-month (1-based)
-     * @param dow output parameter to receive day-of-week (1-based, 1==Sun)
-     * @param doy output parameter to receive day-of-year (1-based)
-     * @param mid output parameter to recieve millis-in-day
-     */
-    static void timeToFields(UDate time, int32_t& year, int32_t& month,
-                            int32_t& dom, int32_t& dow, int32_t& doy, int32_t& mid);
-
-    /**
-     * Return the day of week on the 1970-epoch day
-     * @param day the 1970-epoch day (integral value)
-     * @return the day of week
-     */
-    static int32_t dayOfWeek(double day);
-
-    /**
-     * Returns the ordinal number for the specified day of week within the month.
-     * The valid return value is 1, 2, 3, 4 or -1.
-     * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
-     * @param month 0-based month, with 0==Jan
-     * @param dom 1-based day of month
-     * @return The ordinal number for the specified day of week within the month
-     */
-    static int32_t dayOfWeekInMonth(int32_t year, int32_t month, int32_t dom);
-
-    /**
-     * Converts Julian day to time as milliseconds.
-     * @param julian the given Julian day number.
-     * @return time as milliseconds.
-     * @internal
-     */
-    static inline double julianDayToMillis(int32_t julian);
-
-    /**
-     * Converts time as milliseconds to Julian day.
-     * @param millis the given milliseconds.
-     * @return the Julian day number.
-     * @internal
-     */
-    static inline int32_t millisToJulianDay(double millis);
-
-    /**
-     * Calculates the Gregorian day shift value for an extended year.
-     * @param eyear Extended year
-     * @returns number of days to ADD to Julian in order to convert from J->G
-     */
-    static inline int32_t gregorianShift(int32_t eyear);
-
- private:
-    static const int16_t DAYS_BEFORE[24];
-    static const int8_t MONTH_LENGTH[24];
-};
-
-inline double ClockMath::floorDivide(double numerator, double denominator) {
-    return uprv_floor(numerator / denominator);
-}
-
-inline UBool Grego::isLeapYear(int32_t year) {
-    // year&0x3 == year%4
-    return ((year&0x3) == 0) && ((year%100 != 0) || (year%400 == 0));
-}
-
-inline int8_t
-Grego::monthLength(int32_t year, int32_t month) {
-    return MONTH_LENGTH[month + (isLeapYear(year) ? 12 : 0)];
-}
-
-inline int8_t
-Grego::previousMonthLength(int y, int m) {
-  return (m > 0) ? monthLength(y, m-1) : 31;
-}
-
-inline void Grego::dayToFields(double day, int32_t& year, int32_t& month,
-                               int32_t& dom, int32_t& dow) {
-  int32_t doy_unused;
-  dayToFields(day,year,month,dom,dow,doy_unused);
-}
-
-inline double Grego::julianDayToMillis(int32_t julian)
-{
-  return (julian - kEpochStartAsJulianDay) * kOneDay;
-}
-
-inline int32_t Grego::millisToJulianDay(double millis) {
-  return (int32_t) (kEpochStartAsJulianDay + ClockMath::floorDivide(millis, (double)kOneDay));
-}
-
-inline int32_t Grego::gregorianShift(int32_t eyear) {
-  int64_t y = (int64_t)eyear-1;
-  int32_t gregShift = static_cast<int32_t>(ClockMath::floorDivide(y, (int64_t)400) - ClockMath::floorDivide(y, (int64_t)100) + 2);
-  return gregShift;
-}
-
-U_NAMESPACE_END
-
-#endif // !UCONFIG_NO_FORMATTING
-#endif // GREGOIMP_H
-
-//eof