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// hrtimer.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "hrtimer.h"
#include <stddef.h> // for NULL
#ifdef HIGHRES_TIMER_AVAILABLE
#if defined(CRYPTOPP_WIN32_AVAILABLE)
#include <windows.h>
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
#include <sys/time.h>
#elif defined(macintosh)
#include <Timer.h>
#endif
#include <assert.h>
NAMESPACE_BEGIN(CryptoPP)
word64 Timer::GetCurrentTimerValue()
{
#if defined(CRYPTOPP_WIN32_AVAILABLE)
FILETIME now;
GetSystemTimeAsFileTime(&now);
return now.dwLowDateTime + ((word64)now.dwHighDateTime << 32);
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
timeval now;
gettimeofday(&now, NULL);
return (word64)now.tv_sec * 1000000 + now.tv_usec;
#elif defined(macintosh)
UnsignedWide now;
Microseconds(&now);
return now.lo + ((word64)now.hi << 32);
#endif
}
unsigned long Timer::ConvertTo(word64 t, Unit unit)
{
switch (unit)
{
case SECONDS:
return (unsigned long)(t / (TicksPerMillisecond() * 1000));
case MILLISECONDS:
return (unsigned long)(t / TicksPerMillisecond());
case MICROSECONDS:
assert(TicksPerMillisecond() % 1000 == 0);
return (unsigned long)(t / (TicksPerMillisecond() / 1000));
}
assert(false);
return 0;
}
void Timer::StartTimer()
{
m_start = GetCurrentTimerValue();
m_started = true;
}
unsigned long Timer::ElapsedTime()
{
if (m_stuckAtZero)
return 0;
else if (m_started)
return ConvertTo(GetCurrentTimerValue() - m_start, m_timerUnit);
else
{
StartTimer();
return 0;
}
}
NAMESPACE_END
#endif
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