91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
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/********************************************************************/
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/** Microsoft LAN Manager **/
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/** Copyright(c) Microsoft Corp., 1990-1991 **/
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/********************************************************************/
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/* :ts=4 */
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/*** dostime.cpp - map between DOS & NET time formats
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*/
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#include "npcommon.h"
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#include <convtime.h>
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#define YR_MASK 0xFE00
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#define LEAPYR_MASK 0x0600
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#define YR_BITS 7
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#define MON_MASK 0x01E0
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#define MON_BITS 4
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#define DAY_MASK 0x001F
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#define DAY_BITS 5
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#define HOUR_MASK 0xF800
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#define HOUR_BITS 5
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#define MIN_MASK 0x07E0
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#define MIN_BITS 6
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#define SEC2_MASK 0x001F
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#define SEC2_BITS 5
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void
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NetToDosDate(
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DWORD time,
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dos_time *pinfo) // ptr for return data:
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{
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UINT secs, days;
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WORD r;
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time = (time - _70_to_80_bias) / 2; // # of 2 second periods since 1980
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secs = time % SEC2S_IN_DAY; // 2 second period into day
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days = time / SEC2S_IN_DAY; // days since Jan 1 1980
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r = secs % 30; // # of 2 second steps
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secs /= 30;
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r |= (secs % 60) << SEC2_BITS; // # of minutes
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r |= (secs / 60) << (SEC2_BITS+MIN_BITS); // # of hours
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pinfo->dt_time = r;
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r = days / FOURYEARS; // (r) = four year period past 1980
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days %= FOURYEARS; // (days) = days into four year period
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r *= 4; // (r) = years since 1980 (within 3)
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if (days == 31+28) {
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//* Special case for FEB 29th
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r = (r<<(MON_BITS+DAY_BITS)) + (2<<DAY_BITS) + 29;
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} else {
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if (days > 31+28)
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--days; // compensate for leap year
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while (days >= 365) {
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++r;
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days -= 365;
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}
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for (secs = 1; days >= MonTotal[secs+1] ; ++secs)
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;
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days -= MonTotal[secs];
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r <<= MON_BITS;
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r += (unsigned short) secs;
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r <<= DAY_BITS;
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r += (unsigned short) days+1;
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}
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pinfo->dt_date = r;
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}
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DWORD
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DosToNetDate(dos_time dt)
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{
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UINT days, secs2;
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days = dt.dt_date >> (MON_BITS + DAY_BITS);
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days = days*365 + days/4; // # of years in days
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days += (dt.dt_date & DAY_MASK) + MonTotal[(dt.dt_date&MON_MASK) >> DAY_BITS];
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if ((dt.dt_date&LEAPYR_MASK) == 0
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&& (dt.dt_date&MON_MASK) <= (2<<DAY_BITS))
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--days; // adjust days for early in leap year
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secs2 = ( ((dt.dt_time&HOUR_MASK) >> (MIN_BITS+SEC2_BITS)) * 60
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+ ((dt.dt_time&MIN_MASK) >> SEC2_BITS) ) * 30
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+ (dt.dt_time&SEC2_MASK);
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return (DWORD)days*SECS_IN_DAY + _70_to_80_bias + (DWORD)secs2*2;
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}
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