173 lines
3.4 KiB
C++
173 lines
3.4 KiB
C++
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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Abstract:
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Implementation of various time APIs
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Revision History:
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Author:
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Arnold Miller (ArnoldM) 18-Oct-1997
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--*/
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#include "fltapis.hxx"
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#include <winsock2.h>
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#include <time.h>
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//
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// The system time for 0h 1900
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//
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LARGE_INTEGER li1900 = {0xfde04000,
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0x14f373b};
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EXTERNCDECL
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DWORD
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WINAPI
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NTTimeToNTPTime(PULONG pTime,
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PFILETIME pft OPTIONAL)
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/*++
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Routine Description:
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Convert NT filetime to NTP time. If no time provided use
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the current time.
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--*/
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{
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#ifdef CHICAGO
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return ERROR_NOT_SUPPORTED;
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#else
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LARGE_INTEGER liTime;
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LONGLONG Increment;
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DWORD dwMs;
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//
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// put the current time into the quadword pointed to by the arg
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// The argument points to two consecutive ULONGs in which the
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// time in seconds goes into the first work and the fractional
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// time in seconds in the second word.
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if(!pft)
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{
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GetSystemTimeAsFileTime((LPFILETIME)&liTime);
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}
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else
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{
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*(LPFILETIME)&liTime = *pft;
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}
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//
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// Seconds is simply the time difference
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//
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*pTime = htonl((ULONG)((liTime.QuadPart - li1900.QuadPart) / 10000000));
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//
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// Ms is the residue from the seconds calculation.
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//
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dwMs = (DWORD)(((liTime.QuadPart - li1900.QuadPart) % 10000000) / 10000);
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//
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// time base in the beginning of the year 1900
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//
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*(1 + pTime) = htonl((unsigned long)
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(.5+0xFFFFFFFF*(double)(dwMs/1000.0)));
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return(ERROR_SUCCESS);
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#endif
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}
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EXTERNCDECL
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DWORD
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WINAPI
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NTPTimeToNTFileTime(PLONG pTime, PFILETIME pft, BOOL bHostOrder)
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/*++
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Routine Description:
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Convert NTP timestamp to NT filetime.
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--*/
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{
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#ifdef CHICAGO
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return ERROR_NOT_SUPPORTED;
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#else
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time_t lmaj;
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LONG lmin;
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struct tm *newtime;
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SYSTEMTIME nt;
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if(bHostOrder)
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{
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lmaj = *pTime;
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lmin = *(pTime + 1);
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}
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else
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{
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lmaj = ntohl(*pTime);
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lmin = ntohl(*(pTime + 1));
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}
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//
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// convert time since 1970 to time since 1900.
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//
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lmaj -= (time_t)(365.2422*70*24*60*60+3974.4);
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//
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// get a time structure based on the seconds part of the NTP time.
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//
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newtime = gmtime(&lmaj);
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if(!newtime)
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{
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return(GetLastError());
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}
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//
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// marshall this into a SYSTEMTIME
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//
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nt.wYear=(WORD)(newtime->tm_year+1900);
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nt.wMonth=(WORD)(newtime->tm_mon+1);
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nt.wDay=(WORD)newtime->tm_mday;
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nt.wHour=(WORD)newtime->tm_hour;
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nt.wMinute=(WORD)newtime->tm_min;
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nt.wSecond=(WORD)newtime->tm_sec;
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//
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// compute ms part from the fractional value of the NTP time
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//
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nt.wMilliseconds=(WORD)(.5+1000*(double)lmin /
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(unsigned int)0xFFFFFFFF);
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if (nt.wMilliseconds > 999)
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{
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#if 0
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//
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// this is more accurate but it can also produce a failure
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// and since this isn't supposed to happen anway, it is
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// likely failure will ensue. So just truncate the ms field
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//
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nt.wMilliseconds -= 1000;
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if (++nt.wSecond > 59)
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{
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nt.wSecond = 0;
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if (++nt.wMinute > 59)
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{
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nt.wMinute = 0;
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if (++nt.wHour > 23)
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{
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return(ERROR_INVALID_TIME);
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}
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}
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}
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#else
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nt.wMilliseconds = 999;
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#endif
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}
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return(SystemTimeToFileTime(&nt, pft));
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#endif
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}
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