RetroZilla/build/wince/shunt/include/time_conversions.h

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code, released
* Jan 28, 2003.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Garrett Arch Blythe, 28-January-2003
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#if !defined(__time_conversions_h)
#define __time_conversions_h
#define TIME_BEGIN_MACRO do {
#define TIME_END_MACRO } while(0);
/*
* FILETIME has an epoch of 1601.
* Precomputed the 1970 epoch so we do not have to below.
*/
#define FILETIME_1970 116444736000000000i64
/*
* Marco to support add/sub/mul/div on a FILETIME level.
*/
#define FILETIME_ARITH(outFileTime, inFileTime, inOperation, inValue) \
TIME_BEGIN_MACRO \
ULARGE_INTEGER buffer1; \
\
buffer1.LowPart = inFileTime.dwLowDateTime; \
buffer1.HighPart = inFileTime.dwHighDateTime; \
buffer1.QuadPart = buffer1.QuadPart inOperation inValue; \
outFileTime.dwLowDateTime = buffer1.LowPart; \
outFileTime.dwHighDateTime = buffer1.HighPart; \
TIME_END_MACRO
/*
* FILETIME is in 100 nanosecond units.
* Provide macros for conversion to other second units.
*/
#define FILETIME_2_MICROSECONDS(outTime, inFileTime) \
TIME_BEGIN_MACRO \
ULARGE_INTEGER buffer2; \
\
buffer2.LowPart = inFileTime.dwLowDateTime; \
buffer2.HighPart = inFileTime.dwHighDateTime; \
outTime = buffer2.QuadPart / 10i64; \
TIME_END_MACRO
#define FILETIME_2_MILLISECONDS(outTime, inFileTime) \
TIME_BEGIN_MACRO \
ULARGE_INTEGER buffer3; \
\
buffer3.LowPart = inFileTime.dwLowDateTime; \
buffer3.HighPart = inFileTime.dwHighDateTime; \
outTime = buffer3.QuadPart / 10000i64; \
TIME_END_MACRO
#define FILETIME_2_SECONDS(outTime, inFileTime) \
TIME_BEGIN_MACRO \
ULARGE_INTEGER buffer4; \
\
buffer4.LowPart = inFileTime.dwLowDateTime; \
buffer4.HighPart = inFileTime.dwHighDateTime; \
outTime = buffer4.QuadPart / 10000000i64; \
TIME_END_MACRO
#define SECONDS_2_FILETIME(outFileTime, inTime) \
TIME_BEGIN_MACRO \
ULARGE_INTEGER buffer5; \
\
buffer5.QuadPart = (ULONGLONG)inTime * 10000000i64; \
outFileTime.dwLowDateTime = buffer5.LowPart; \
outFileTime.dwHighDateTime = buffer5.HighPart; \
TIME_END_MACRO
/*
* Conversions from FILETIME 1601 epoch time to LIBC 1970 time.epoch.
*/
#define FILETIME_2_time_t(outTimeT, inFileTime) \
TIME_BEGIN_MACRO \
FILETIME result6; \
ULONGLONG conversion6; \
\
FILETIME_ARITH(result6, inFileTime, -, FILETIME_1970); \
FILETIME_2_SECONDS(conversion6, result6); \
outTimeT = (time_t)conversion6; \
TIME_END_MACRO
#define time_t_2_FILETIME(outFileTime, inTimeT) \
TIME_BEGIN_MACRO \
FILETIME conversion7; \
\
SECONDS_2_FILETIME(conversion7, inTimeT); \
FILETIME_ARITH(outFileTime, conversion7, +, FILETIME_1970); \
TIME_END_MACRO
/*
* Sometimes SYSTEMTIME needs to be handled as well.
*/
#define SYSTEMTIME_2_time_t(outTimeT, inSystemTime) \
TIME_BEGIN_MACRO \
FILETIME result8; \
\
SystemTimeToFileTime(&inSystemTime, &result8); \
FILETIME_2_time_t(outTimeT, result8); \
TIME_END_MACRO
#define time_t_2_SYSTEMTIME(outSystemTime, inTimeT) \
TIME_BEGIN_MACRO \
FILETIME conversion9; \
\
time_t_2_FILETIME(conversion9, inTimeT); \
FileTimeToSystemTime(&conversion9, &outSystemTime); \
TIME_END_MACRO
#define time_t_2_LOCALSYSTEMTIME(outSystemTime, inTimeT) \
TIME_BEGIN_MACRO \
FILETIME conversion10; \
FILETIME localConversion10; \
\
time_t_2_FILETIME(conversion10, inTimeT); \
FileTimeToLocalFileTime(&conversion10, &localConversion10); \
FileTimeToSystemTime(&localConversion10, &outSystemTime); \
TIME_END_MACRO
#endif /* __time_conversions_h */