ext/cvshared/cpp/CvTime.cpp

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/*! \file  CvTime.cpp
    \brief Set of classes and functions providing portable time convertion
	       and handling functionality.

*-  Project     : SkyKey SDK
*-  Authors     : Mony Aladjem
*-  Company     : Certivox
*-  Created     : August 24, 2012, 9:39 AM
*-  Last update : February 15, 2013
*-  Platform    : Windows XP SP3 - Windows 7
*-  Dependency  : 

 Set of classes and functions providing portable time convertion
 and handling functionality.

*/

#include "CvTime.h"

#ifdef __MACH__
    #include <mach/clock.h>
    #include <mach/mach.h>
#endif

namespace CvShared
{
	
int DateTime::GetDaysInYear( int aYear )
{
	DateTime dateTime;
	
	dateTime.m_day = 0;
	dateTime.m_month = 1;
	dateTime.m_year = aYear+1;
	
	struct tm tmDateTime;
	dateTime.ToTm( tmDateTime );
	
	return tmDateTime.tm_yday+1;
}

int DateTime::GetDaysInMonth( int aMonth, int aYear )
{
	DateTime dateTime;
	
	dateTime.m_day = 0;
	dateTime.m_month = aMonth + 1;
	dateTime.m_year = aYear;
	
	if ( dateTime.m_month > 12 )
	{
		dateTime.m_month = 1;
		++dateTime.m_year;
	}
	
	struct tm tmDateTime;
	dateTime.ToTm( tmDateTime );
	
	return tmDateTime.tm_mday;
}

#if defined(_WIN32)

int clock_gettime( int aDummy, TimeSpec* apTimespec )
{
    static LARGE_INTEGER offset;
    static bool bInitialized = false;
 
	if ( !bInitialized )
	{
		SYSTEMTIME s;
		s.wYear = 1970;
		s.wMonth = 1;
		s.wDay = 1;
		s.wHour = 0;
		s.wMinute = 0;
		s.wSecond = 0;
		s.wMilliseconds = 0;

		FILETIME f;
		SystemTimeToFileTime( &s, &f );

		LARGE_INTEGER offset;
		offset.QuadPart = f.dwHighDateTime;
		offset.QuadPart = (offset.QuadPart << 32) | f.dwLowDateTime;

		bInitialized = true;
	}

    FILETIME f;
	GetSystemTimeAsFileTime( &f );

    LARGE_INTEGER t;
	t.QuadPart = f.dwHighDateTime;
	t.QuadPart = (t.QuadPart << 32) | f.dwLowDateTime;
    t.QuadPart -= offset.QuadPart;

	// t.QuadPart is in 100-nanosecond intervals
	*apTimespec = Microsecs(t.QuadPart/10).ToTimeSpec();

	return 0;
}

#elif defined (__MACH__)
    
int clock_gettime( int aDummy, TimeSpec* apTimespec )
{
    clock_serv_t cclock;
    mach_timespec_t mts;
    
    host_get_clock_service( mach_host_self(), CALENDAR_CLOCK, &cclock );
    
    clock_get_time(cclock, &mts);
    
    mach_port_deallocate(mach_task_self(), cclock);
    
    apTimespec->tv_sec = mts.tv_sec;
    apTimespec->tv_nsec = mts.tv_nsec;
    
    return 0;
}
    
#endif
	
}