diff options
Diffstat (limited to 'src/VBox/Runtime/r3/win/time2-win.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/win/time2-win.cpp | 164 |
1 files changed, 164 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..d4f0db06 --- /dev/null +++ b/src/VBox/Runtime/r3/win/time2-win.cpp @@ -0,0 +1,164 @@ +/* $Id: time2-win.cpp $ */ +/** @file + * IPRT - Time, Windows. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* 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(); +} + |