From b21162cf8e06f40baa1f58be6a8c17435cebc34d Mon Sep 17 00:00:00 2001
From: weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Fri, 4 Oct 2002 17:31:41 +0000
Subject: Initial revision

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@2 57ff6487-cd31-0410-9ec3-f628ee90f5f0
---
 hrtimer.cpp | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 hrtimer.cpp

(limited to 'hrtimer.cpp')

diff --git a/hrtimer.cpp b/hrtimer.cpp
new file mode 100644
index 0000000..2dafbca
--- /dev/null
+++ b/hrtimer.cpp
@@ -0,0 +1,75 @@
+// 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(__unix__)
+#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(__unix__)
+	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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