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// hrtimer.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "hrtimer.h"
#include "misc.h"
#include <stddef.h> // for NULL
#if defined(CRYPTOPP_WIN32_AVAILABLE)
#include <windows.h>
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
#include <sys/time.h>
#include <sys/times.h>
#include <unistd.h>
#endif
#include <assert.h>
NAMESPACE_BEGIN(CryptoPP)
#ifndef CRYPTOPP_IMPORTS
double TimerBase::ConvertTo(TimerWord t, Unit unit)
{
static unsigned long unitsPerSecondTable[] = {1, 1000, 1000*1000, 1000*1000*1000};
assert(unit < sizeof(unitsPerSecondTable) / sizeof(unitsPerSecondTable[0]));
return (double)CRYPTOPP_VC6_INT64 t * unitsPerSecondTable[unit] / CRYPTOPP_VC6_INT64 TicksPerSecond();
}
void TimerBase::StartTimer()
{
m_last = m_start = GetCurrentTimerValue();
m_started = true;
}
double TimerBase::ElapsedTimeAsDouble()
{
if (m_stuckAtZero)
return 0;
if (m_started)
{
TimerWord now = GetCurrentTimerValue();
if (m_last < now) // protect against OS bugs where time goes backwards
m_last = now;
return ConvertTo(m_last - m_start, m_timerUnit);
}
StartTimer();
return 0;
}
unsigned long TimerBase::ElapsedTime()
{
double elapsed = ElapsedTimeAsDouble();
assert(elapsed <= ULONG_MAX);
return (unsigned long)elapsed;
}
TimerWord Timer::GetCurrentTimerValue()
{
#if defined(CRYPTOPP_WIN32_AVAILABLE)
LARGE_INTEGER now;
if (!QueryPerformanceCounter(&now))
throw Exception(Exception::OTHER_ERROR, "Timer: QueryPerformanceCounter failed with error " + IntToString(GetLastError()));
return now.QuadPart;
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
timeval now;
gettimeofday(&now, NULL);
return (TimerWord)now.tv_sec * 1000000 + now.tv_usec;
#else
clock_t now;
return clock();
#endif
}
TimerWord Timer::TicksPerSecond()
{
#if defined(CRYPTOPP_WIN32_AVAILABLE)
static LARGE_INTEGER freq = {0};
if (freq.QuadPart == 0)
{
if (!QueryPerformanceFrequency(&freq))
throw Exception(Exception::OTHER_ERROR, "Timer: QueryPerformanceFrequency failed with error " + IntToString(GetLastError()));
}
return freq.QuadPart;
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
return 1000000;
#elif defined(CLOCKS_PER_SEC)
return CLOCKS_PER_SEC;
#elif defined(CLK_TCK)
return CLK_TCK;
#else
return 1000000;
#endif
}
#endif // #ifndef CRYPTOPP_IMPORTS
TimerWord ThreadUserTimer::GetCurrentTimerValue()
{
#if defined(CRYPTOPP_WIN32_AVAILABLE)
static bool getCurrentThreadImplemented = true;
if (getCurrentThreadImplemented)
{
FILETIME now, ignored;
if (!GetThreadTimes(GetCurrentThread(), &ignored, &ignored, &ignored, &now))
{
DWORD lastError = GetLastError();
if (lastError == ERROR_CALL_NOT_IMPLEMENTED)
{
getCurrentThreadImplemented = false;
goto GetCurrentThreadNotImplemented;
}
throw Exception(Exception::OTHER_ERROR, "ThreadUserTimer: GetThreadTimes failed with error " + IntToString(lastError));
}
return now.dwLowDateTime + ((TimerWord)now.dwHighDateTime << 32);
}
GetCurrentThreadNotImplemented:
return (TimerWord)clock() * (10*1000*1000 / CLOCKS_PER_SEC);
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
tms now;
times(&now);
return now.tms_utime;
#else
return clock();
#endif
}
TimerWord ThreadUserTimer::TicksPerSecond()
{
#if defined(CRYPTOPP_WIN32_AVAILABLE)
return 10*1000*1000;
#elif defined(CRYPTOPP_UNIX_AVAILABLE)
static const long ticksPerSecond = sysconf(_SC_CLK_TCK);
return ticksPerSecond;
#else
return CLOCKS_PER_SEC;
#endif
}
NAMESPACE_END
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