Timestamp.cpp

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 /*
 * Timestamp.cpp
 *
 *  Created on: 14.01.2011
 *      Author: Thomas Wiemann
 */
 
#include "lvr2/io/Timestamp.hpp"
 
#if defined(_MSC_VER)
#include <time.h>
#include <Windows.h>
 
const __int64 DELTA_EPOCH_IN_MICROSECS = 11644473600000000;
 
/* IN UNIX the use of the timezone struct is obsolete;
I don't know why you use it. See http://linux.about.com/od/commands/l/blcmdl2_gettime.htm
But if you want to use this structure to know about GMT(UTC) diffrence from your local time
it will be next: tz_minuteswest is the real diffrence in minutes from GMT(UTC) and a tz_dsttime is a flag
indicates whether daylight is now in use
*/
struct timezone
{
        __int32  tz_minuteswest; /* minutes W of Greenwich */
        bool  tz_dsttime;     /* type of dst correction */
};
 
 
int gettimeofday(struct timeval *tv/*in*/, struct timezone *tz/*in*/)
{
        FILETIME ft;
        __int64 tmpres = 0;
        TIME_ZONE_INFORMATION tz_winapi;
        int rez = 0;
 
        ZeroMemory(&ft, sizeof(ft));
        ZeroMemory(&tz_winapi, sizeof(tz_winapi));
 
        GetSystemTimeAsFileTime(&ft);
 
        tmpres = ft.dwHighDateTime;
        tmpres <<= 32;
        tmpres |= ft.dwLowDateTime;
 
        /*converting file time to unix epoch*/
        tmpres /= 10;  /*convert into microseconds*/
        tmpres -= DELTA_EPOCH_IN_MICROSECS;
        tv->tv_sec = (__int32)(tmpres*0.000001);
        tv->tv_usec = (tmpres % 1000000);
 
 
        //_tzset(),don't work properly, so we use GetTimeZoneInformation
        /*
        rez = GetTimeZoneInformation(&tz_winapi);
        tz->tz_dsttime = (rez == 2) ? true : false;
        tz->tz_minuteswest = tz_winapi.Bias + ((rez == 2) ? tz_winapi.DaylightBias : 0); */
 
        return 0;
}
#else
#include <sys/time.h>
#include <unistd.h>
#endif
 
 
 
#include <cstddef>
#include <cstdlib>
#include <cstdio>
 
#include <iostream>
using namespace std;
 
namespace lvr2 {
 
Timestamp::Timestamp(): m_nullStream(&m_nullBuffer)
{
    resetTimer();
}
 
 
unsigned long Timestamp::getCurrentTimeInMs() const
{
    static struct timeval tv;
    gettimeofday( &tv, NULL );
    return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
 
unsigned long Timestamp::getElapsedTimeInMs() const
{
    return getCurrentTimeInMs() - m_startTime;
}
 
double Timestamp::getCurrentTimeinS() const
{
    return (double) getCurrentTimeInMs() / 1000.0;
}
 
double Timestamp::getElapsedTimeInS() const
{
    return (double) getElapsedTimeInMs() / 1000.0;
}
 
void Timestamp::resetTimer()
{
    m_startTime = getCurrentTimeInMs();
}
 
string Timestamp::getElapsedTime() const
{
    unsigned long time = getElapsedTimeInMs();
    unsigned long hours =   time / 3600000;
    unsigned long mins  = ( time % 3600000 ) / 60000;
    unsigned long secs  = ( time %   60000 ) /  1000;
    unsigned long msecs =   time %    1000;
 
    char times[512];
 
        sprintf( times, "[%02lu:%02lu:%02lu %03lu] ", hours, mins, secs, msecs);
    string result( times );
   
    return result;
}
 
} // namespace lvr