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/* wvWare
* Copyright (C) Caolan McNamara, Dom Lachowicz, and others
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "wv.h"
void
wvGetFILETIME (FILETIME * ft, wvStream * fd)
{
ft->dwLowDateTime = read_32ubit (fd);
ft->dwHighDateTime = read_32ubit (fd);
}
void
wvInitFILETIME (FILETIME * ft)
{
ft->dwLowDateTime = 0;
ft->dwHighDateTime = 0;
}
int
wvFileTimeToDosDateTime (const FILETIME * ft, U16 * fatdate, U16 * fattime)
{
time_t unixtime = wvDOSFS_FileTimeToUnixTime (ft, NULL);
struct tm *tm = localtime (&unixtime);
if (fattime)
*fattime = (tm->tm_hour << 11) + (tm->tm_min << 5) + (tm->tm_sec / 2);
if (fatdate)
*fatdate = ((tm->tm_year - 80) << 9) + ((tm->tm_mon + 1) << 5)
+ tm->tm_mday;
return (1);
}
/***********************************************************************
* DOSFS_FileTimeToUnixTime
*
* Convert a FILETIME format to Unix time.
* If not NULL, 'remainder' contains the fractional part of the filetime,
* in the range of [0..9999999] (even if time_t is negative).
*/
time_t
wvDOSFS_FileTimeToUnixTime (const FILETIME * filetime, U32 * remainder)
{
U32 a0; /* 16 bit, low bits */
U32 a1; /* 16 bit, medium bits */
U32 a2; /* 32 bit, high bits */
U32 r; /* remainder of division */
unsigned int carry; /* carry bit for subtraction */
int negative; /* whether a represents a negative value */
/* Copy the time values to a2/a1/a0 */
a2 = filetime->dwHighDateTime;
a1 = ((U32) filetime->dwLowDateTime) >> 16;
a0 = ((U32) filetime->dwLowDateTime) & 0xffff;
/* Subtract the time difference */
if (a0 >= 32768)
a0 -= 32768, carry = 0;
else
a0 += (1 << 16) - 32768, carry = 1;
if (a1 >= 54590 + carry)
a1 -= 54590 + carry, carry = 0;
else
a1 += (1 << 16) - 54590 - carry, carry = 1;
a2 -= 27111902 + carry;
/* If a is negative, replace a by (-1-a) */
negative = (a2 >= ((U32) 1) << 31);
if (negative)
{
/* Set a to -a - 1 (a is a2/a1/a0) */
a0 = 0xffff - a0;
a1 = 0xffff - a1;
a2 = ~a2;
}
/* Divide a by 10000000 (a = a2/a1/a0), put the rest into r.
Split the divisor into 10000 * 1000 which are both less than 0xffff. */
a1 += (a2 % 10000) << 16;
a2 /= 10000;
a0 += (a1 % 10000) << 16;
a1 /= 10000;
r = a0 % 10000;
a0 /= 10000;
a1 += (a2 % 1000) << 16;
a2 /= 1000;
a0 += (a1 % 1000) << 16;
a1 /= 1000;
r += (a0 % 1000) * 10000;
a0 /= 1000;
/* If a was negative, replace a by (-1-a) and r by (9999999 - r) */
if (negative)
{
/* Set a to -a - 1 (a is a2/a1/a0) */
a0 = 0xffff - a0;
a1 = 0xffff - a1;
a2 = ~a2;
r = 9999999 - r;
}
if (remainder)
*remainder = r;
/* Do not replace this by << 32, it gives a compiler warning and it does
not work. */
return ((((time_t) a2) << 16) << 16) + (a1 << 16) + a0;
}
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