From 2959598108418ebebe84c76c274d58eda0eab5e8 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 30 Jul 2011 11:14:02 +0300
Subject: [PATCH] Add conversions from timeval/FILETIME to RawTime

---
 source/time/rawtime.cpp       | 38 ++++++++++++++++++++++++++++++++++-
 source/time/rawtime_private.h | 10 ++++++---
 source/time/utils.cpp         | 21 ++-----------------
 3 files changed, 46 insertions(+), 23 deletions(-)

diff --git a/source/time/rawtime.cpp b/source/time/rawtime.cpp
index 5c21a68..a299246 100644
--- a/source/time/rawtime.cpp
+++ b/source/time/rawtime.cpp
@@ -1,10 +1,41 @@
 #include "rawtime.h"
 #include "rawtime_private.h"
 
+namespace {
+
+#ifdef WIN32
+/// Returns the unixtime epoch as filetime
+Msp::Time::RawTime get_epoch()
+{
+	SYSTEMTIME st;
+	st.wYear = 1970;
+	st.wMonth = 1;
+	st.wDay = 1;
+	st.wHour = 0;
+	st.wMinute = 0;
+	st.wSecond = 0;
+	st.wMilliseconds = 0;
+
+	FILETIME ft;
+	SystemTimeToFileTime(&st, &ft);
+	return (ft.dwLowDateTime+(static_cast<Msp::Time::RawTime>(ft.dwHighDateTime)<<32))/10;
+}
+#endif
+
+}
+
+
 namespace Msp {
 namespace Time {
 
-#ifndef WIN32
+#ifdef WIN32
+RawTime filetime_to_rawtime(const FILETIME &ft)
+{
+	static RawTime epoch = get_epoch();
+	
+	return (ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10-epoch;
+}
+#else
 timeval rawtime_to_timeval(RawTime raw)
 {
 	timeval tv;
@@ -20,6 +51,11 @@ timespec rawtime_to_timespec(RawTime raw)
 	ts.tv_nsec = (raw%1000000)*1000;
 	return ts;
 }
+
+RawTime timeval_to_rawtime(const timeval &tv)
+{
+	return tv.tv_sec*1000000LL+tv.tv_usec;
+}
 #endif
 
 } // namespace Time
diff --git a/source/time/rawtime_private.h b/source/time/rawtime_private.h
index 566d5a6..846a712 100644
--- a/source/time/rawtime_private.h
+++ b/source/time/rawtime_private.h
@@ -1,7 +1,9 @@
 #ifndef MSP_TIME_RAWTIME_PRIVATE_H_
 #define MSP_TIME_RAWTIME_PRIVATE_H_
 
-#ifndef WIN32
+#ifdef WIN32
+#include <windows.h>
+#else
 #include <sys/time.h>
 #endif
 #include "rawtime.h"
@@ -9,10 +11,12 @@
 namespace Msp {
 namespace Time {
 
-#ifndef WIN32
-// Internal conversion utilities, not intended for public use
+#ifdef WIN32
+RawTime filetime_to_rawtime(const FILETIME &);
+#else
 timeval rawtime_to_timeval(RawTime);
 timespec rawtime_to_timespec(RawTime);
+RawTime timeval_to_rawtime(const timeval &);
 #endif
 
 } // namespace Time
diff --git a/source/time/utils.cpp b/source/time/utils.cpp
index b59a8af..8b57695 100644
--- a/source/time/utils.cpp
+++ b/source/time/utils.cpp
@@ -23,28 +23,11 @@ TimeStamp now()
 #ifndef WIN32
 	timeval tv;
 	gettimeofday(&tv, 0);
-	return TimeStamp(tv.tv_sec*1000000LL+tv.tv_usec);
+	return TimeStamp(timeval_to_rawtime(tv));
 #else
-	static RawTime epoch = 0;
-	if(!epoch)
-	{
-		SYSTEMTIME st;
-		st.wYear = 1970;
-		st.wMonth = 1;
-		st.wDay = 1;
-		st.wHour = 0;
-		st.wMinute = 0;
-		st.wSecond = 0;
-		st.wMilliseconds = 0;
-
-		FILETIME ft;
-		SystemTimeToFileTime(&st, &ft);
-		epoch = (ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10;
-	}
-	
 	FILETIME ft;
 	GetSystemTimeAsFileTime(&ft);
-	return TimeStamp((ft.dwLowDateTime+(static_cast<RawTime>(ft.dwHighDateTime)<<32))/10-epoch);
+	return TimeStamp(filetime_to_rawtime(ft));
 #endif
 }
 
-- 
2.45.2