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/***********************************************************************
*
* Borrowed from WINE sources!! (http://www.winehq.com)
* Converts a Win32 FILETIME structure to a UNIX time_t value
*/
/*** WARNING ****
* This file is not to be incluided in a Visual C++ Project
* It will make the whole project fail to compile
* There are functions in libpst.c to handle the dates
* Do not use this one
*/
#include <time.h>
#include "common.h"
#include "timeconv.h"
time_t fileTimeToUnixTime( const FILETIME *filetime, DWORD *remainder );
char * fileTimeToAscii (const FILETIME *filetime);
char * fileTimeToAscii (const FILETIME *filetime) {
time_t t1;
t1 = fileTimeToUnixTime(filetime,0);
return ctime(&t1);
}
struct tm * fileTimeToStructTM (const FILETIME *filetime) {
time_t t1;
t1 = fileTimeToUnixTime(filetime, 0);
return gmtime(&t1);
}
/***********************************************************************
* 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 fileTimeToUnixTime( const FILETIME *filetime, DWORD *remainder )
{
/* Read the comment in the function DOSFS_UnixTimeToFileTime. */
#if USE_LONG_LONG
long long int t = filetime->dwHighDateTime;
t <<= 32;
t += (UINT32)filetime->dwLowDateTime;
t -= 116444736000000000LL;
if (t < 0)
{
if (remainder) *remainder = 9999999 - (-t - 1) % 10000000;
return -1 - ((-t - 1) / 10000000);
}
else
{
if (remainder) *remainder = t % 10000000;
return t / 10000000;
}
#else /* ISO version */
UINT32 a0; /* 16 bit, low bits */
UINT32 a1; /* 16 bit, medium bits */
UINT32 a2; /* 32 bit, high bits */
UINT32 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 = (UINT32)filetime->dwHighDateTime;
a1 = ((UINT32)filetime->dwLowDateTime ) >> 16;
a0 = ((UINT32)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 >= ((UINT32)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;
#endif
}
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