/*-
?*?Copyright?（c）?2009-2011?George?V.?Neville-Neil?Steven?Kreuzer?
?*?????????????????????????Martin?Burnicki?Gael?Mace?Alexandre?Van?Kempen
?*?Copyright?（c）?2005-2008?Kendall?Correll?Aidan?Williams
?*
?*?All?Rights?Reserved
?*?
?*?Redistribution?and?use?in?source?and?binary?forms?with?or?without
?*?modification?are?permitted?provided?that?the?following?conditions?are
?*?met:
?*?1.?Redistributions?of?source?code?must?retain?the?above?copyright?notice
?*????this?list?of?conditions?and?the?following?disclaimer.
?*?2.?Redistributions?in?binary?form?must?reproduce?the?above?copyright
?*????notice?this?list?of?conditions?and?the?following?disclaimer?in?the
?*????documentation?and/or?other?materials?provided?with?the?distribution.
?*?
?*?THIS?SOFTWARE?IS?PROVIDED?BY?THE?AUTHORS?‘‘AS?IS‘‘?AND?ANY?EXPRESS?OR
?*?IMPLIED?WARRANTIES?INCLUDING?BUT?NOT?LIMITED?TO?THE?IMPLIED
?*?WARRANTIES?OF?MERCHANTABILITY?AND?FITNESS?FOR?A?PARTICULAR?PURPOSE?ARE
?*?DISCLAIMED.?IN?NO?EVENT?SHALL?THE?AUTHORS?OR?CONTRIBUTORS?BE?LIABLE
?*?FOR?ANY?DIRECT?INDIRECT?INCIDENTAL?SPECIAL?EXEMPLARY?OR
?*?CONSEQUENTIAL?DAMAGES?（INCLUDING?BUT?NOT?LIMITED?TO?PROCUREMENT?OF
?*?SUBSTITUTE?GOODS?OR?SERVICES;?LOSS?OF?USE?DATA?OR?PROFITS;?OR
?*?BUSINESS?INTERRUPTION）?HOWEVER?CAUSED?AND?ON?ANY?THEORY?OF?LIABILITY
?*?WHETHER?IN?CONTRACT?STRICT?LIABILITY?OR?TORT?（INCLUDING?NEGLIGENCE
?*?OR?OTHERWISE）?ARISING?IN?ANY?WAY?OUT?OF?THE?USE?OF?THIS?SOFTWARE?EVEN
?*?IF?ADVISED?OF?THE?POSSIBILITY?OF?SUCH?DAMAGE.
?*/

/**
?*?@file???arith.c
?*?@date???Tue?Jul?20?16:12:51?2010
?*?
?*?@brief??Time?format?conversion?routines?and?additional?math?functions.
?*?
?*?
?*/

#include?“ptpd.h“


void?
integer64_to_internalTime（Integer64?bigint?TimeInternal?*?internal）
{
	int?sign;
	int64_t?scaledNanoseconds;

	scaledNanoseconds?=?bigint.msb;
	scaledNanoseconds?<<=32;
	scaledNanoseconds?+=?bigint.lsb;
	
	/*determine?sign?of?result?big?integer?number*/

	if?（scaledNanoseconds?	{
		scaledNanoseconds?=?-scaledNanoseconds;
		sign?=?-1;
	}
	else
	{
		sign?=?1;
	}

	/*fractional?nanoseconds?are?excluded?（see?5.3.2）*/
	scaledNanoseconds?>>=?16;
	internal->seconds?=?sign?*?（scaledNanoseconds?/?1000000000）;
	internal->nanoseconds?=?sign?*?（scaledNanoseconds?%?1000000000）;
}


void?
fromInternalTime（TimeInternal?*?internal?Timestamp?*?external）
{

	/*
	?*?fromInternalTime?is?only?used?to?convert?time?given?by?the?system
	?*?to?a?timestamp?As?a?consequence?no?negative?value?can?normally
	?*?be?found?in?（internal）
	?*?
	?*?Note?that?offsets?are?also?represented?with?TimeInternal?structure
	?*?and?can?be?negative?but?offset?are?never?convert?into?Timestamp
	?*?so?there?is?no?problem?here.
	?*/

	if?（（internal->seconds?&?~INT_MAX）?||?
	????（internal->nanoseconds?&?~INT_MAX））?{
		DBG（“Negative?value?canno‘t?be?converted?into?timestamp?\n“）;
		return;
	}?else?{
		external->secondsField.lsb?=?internal->seconds;
		external->nanosecondsField?=?internal->nanoseconds;
		external->secondsField.msb?=?0;