1 files changed, 154 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/win/time2-win.cpp b/src/VBox/Runtime/r3/win/time2-win.cpp
new file mode 100644
index 00000000..511c6577
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/time2-win.cpp
@@ -0,0 +1,154 @@
+/* $Id: time2-win.cpp $ */
+/** @file
+ * IPRT - Time, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#include <iprt/win/windows.h>
+
+#include <iprt/time.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include "internal/time.h"
+
+#include "internal-r3-win.h"
+
+
+RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime)
+{
+    FILETIME    FileTime;
+    SYSTEMTIME  SysTime;
+    if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTime, &FileTime), &SysTime))
+    {
+        if (SetSystemTime(&SysTime))
+            return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
+{
+    RTTIMESPEC LocalTime;
+    if (g_pfnSystemTimeToTzSpecificLocalTime)
+    {
+        /*
+         * FileTimeToLocalFileTime does not do the right thing, so we'll have
+         * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
+         *
+         * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
+         *       we have to do the offUTC calculation using milliseconds and adjust
+         *       u32Nanosecons by sub milliseconds digits.
+         */
+        SYSTEMTIME SystemTimeIn;
+        FILETIME FileTime;
+        if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
+        {
+            SYSTEMTIME SystemTimeOut;
+            if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
+            {
+                if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
+                {
+                    RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
+                    pTime = RTTimeExplode(pTime, &LocalTime);
+                    if (pTime)
+                    {
+                        pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
+                        pTime->offUTC = (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) / RT_MS_1MIN;
+                        pTime->u32Nanosecond += RTTimeSpecGetNano(pTimeSpec) % RT_NS_1MS;
+                    }
+                    return pTime;
+                }
+            }
+        }
+    }
+
+    /*
+     * The fallback is to use the current offset.
+     * (A better fallback would be to use the offset of the same time of the year.)
+     */
+    LocalTime = *pTimeSpec;
+    int64_t cNsUtcOffset = RTTimeLocalDeltaNano();
+    RTTimeSpecAddNano(&LocalTime, cNsUtcOffset);
+    pTime = RTTimeExplode(pTime, &LocalTime);
+    if (pTime)
+    {
+        pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
+        pTime->offUTC = cNsUtcOffset / RT_NS_1MIN;
+    }
+    return pTime;
+}
+
+
+/**
+ * Gets the delta between UTC and local time at the given time.
+ *
+ * @code
+ *      RTTIMESPEC LocalTime;
+ *      RTTimeNow(&LocalTime);
+ *      RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNanoFor(&LocalTime));
+ * @endcode
+ *
+ * @param   pTimeSpec   The time spec giving the time to get the delta for.
+ * @returns Returns the nanosecond delta between UTC and local time.
+ */
+RTDECL(int64_t) RTTimeLocalDeltaNanoFor(PCRTTIMESPEC pTimeSpec)
+{
+    RTTIMESPEC LocalTime;
+    if (g_pfnSystemTimeToTzSpecificLocalTime)
+    {
+        /*
+         * FileTimeToLocalFileTime does not do the right thing, so we'll have
+         * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
+         *
+         * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
+         *       we have to do the offUTC calculation using milliseconds and adjust
+         *       u32Nanosecons by sub milliseconds digits.
+         */
+        SYSTEMTIME SystemTimeIn;
+        FILETIME FileTime;
+        if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
+        {
+            SYSTEMTIME SystemTimeOut;
+            if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
+            {
+                if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
+                {
+                    RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
+
+                    return (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) * RT_NS_1MS;
+                }
+            }
+        }
+    }
+
+    return RTTimeLocalDeltaNano();
+}
+