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Ditch crummy fattime <--> timespec conversion functions
This commit is contained in:
Poul-Henning Kamp
parent
4a4cd136b4
commit
3c925ad2aa
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=163652
@ -34,6 +34,7 @@
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/clock.h>
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#include <sys/malloc.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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@ -52,58 +53,6 @@
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MALLOC_DEFINE(M_SMBFSDATA, "smbfs_data", "SMBFS private data");
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/*
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* Time & date conversion routines taken from msdosfs. Although leap
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* year calculation is bogus, it's sufficient before 2100 :)
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*/
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/*
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* This is the format of the contents of the deTime field in the direntry
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* structure.
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* We don't use bitfields because we don't know how compilers for
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* arbitrary machines will lay them out.
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*/
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#define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */
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#define DT_2SECONDS_SHIFT 0
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#define DT_MINUTES_MASK 0x7E0 /* minutes */
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#define DT_MINUTES_SHIFT 5
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#define DT_HOURS_MASK 0xF800 /* hours */
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#define DT_HOURS_SHIFT 11
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/*
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* This is the format of the contents of the deDate field in the direntry
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* structure.
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*/
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#define DD_DAY_MASK 0x1F /* day of month */
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#define DD_DAY_SHIFT 0
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#define DD_MONTH_MASK 0x1E0 /* month */
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#define DD_MONTH_SHIFT 5
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#define DD_YEAR_MASK 0xFE00 /* year - 1980 */
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#define DD_YEAR_SHIFT 9
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/*
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* Total number of days that have passed for each month in a regular year.
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*/
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static u_short regyear[] = {
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31, 59, 90, 120, 151, 181,
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212, 243, 273, 304, 334, 365
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};
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/*
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* Total number of days that have passed for each month in a leap year.
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*/
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static u_short leapyear[] = {
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31, 60, 91, 121, 152, 182,
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213, 244, 274, 305, 335, 366
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};
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/*
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* Variables used to remember parts of the last time conversion. Maybe we
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* can avoid a full conversion.
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*/
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static u_long lasttime;
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static u_long lastday;
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static u_short lastddate;
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static u_short lastdtime;
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void
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smb_time_local2server(struct timespec *tsp, int tzoff, u_long *seconds)
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{
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@ -145,112 +94,22 @@ void
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smb_time_unix2dos(struct timespec *tsp, int tzoff, u_int16_t *ddp,
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u_int16_t *dtp, u_int8_t *dhp)
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{
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u_long t, days, year, month, inc;
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u_short *months;
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struct timespec tt;
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u_long t;
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/*
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* If the time from the last conversion is the same as now, then
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* skip the computations and use the saved result.
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*/
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tt = *tsp;
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smb_time_local2server(tsp, tzoff, &t);
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t &= ~1;
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if (lasttime != t) {
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lasttime = t;
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lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
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+ (((t / 60) % 60) << DT_MINUTES_SHIFT)
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+ (((t / 3600) % 24) << DT_HOURS_SHIFT);
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/*
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* If the number of days since 1970 is the same as the last
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* time we did the computation then skip all this leap year
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* and month stuff.
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*/
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days = t / (24 * 60 * 60);
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if (days != lastday) {
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lastday = days;
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for (year = 1970;; year++) {
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inc = year & 0x03 ? 365 : 366;
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if (days < inc)
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break;
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days -= inc;
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}
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months = year & 0x03 ? regyear : leapyear;
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for (month = 0; days >= months[month]; month++)
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;
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if (month > 0)
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days -= months[month - 1];
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lastddate = ((days + 1) << DD_DAY_SHIFT)
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+ ((month + 1) << DD_MONTH_SHIFT);
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/*
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* Remember dos's idea of time is relative to 1980.
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* unix's is relative to 1970. If somehow we get a
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* time before 1980 then don't give totally crazy
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* results.
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*/
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if (year > 1980)
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lastddate += (year - 1980) << DD_YEAR_SHIFT;
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}
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}
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if (dtp)
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*dtp = lastdtime;
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if (dhp)
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*dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
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*ddp = lastddate;
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tt.tv_sec = t;
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timespec2fattime(&tt, 1, ddp, dtp, dhp);
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}
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/*
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* The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
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* interval there were 8 regular years and 2 leap years.
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*/
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#define SECONDSTO1980 (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
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static u_short lastdosdate;
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static u_long lastseconds;
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void
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smb_dos2unixtime(u_int dd, u_int dt, u_int dh, int tzoff,
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struct timespec *tsp)
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{
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u_long seconds;
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u_long month;
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u_long year;
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u_long days;
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u_short *months;
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if (dd == 0) {
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tsp->tv_sec = 0;
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tsp->tv_nsec = 0;
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return;
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}
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seconds = (((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) << 1)
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+ ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
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+ ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
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+ dh / 100;
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/*
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* If the year, month, and day from the last conversion are the
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* same then use the saved value.
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*/
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if (lastdosdate != dd) {
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lastdosdate = dd;
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days = 0;
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year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
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days = year * 365;
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days += year / 4 + 1; /* add in leap days */
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if ((year & 0x03) == 0)
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days--; /* if year is a leap year */
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months = year & 0x03 ? regyear : leapyear;
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month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
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if (month < 1 || month > 12) {
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month = 1;
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}
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if (month > 1)
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days += months[month - 2];
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days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
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lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
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}
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smb_time_server2local(seconds + lastseconds, tzoff, tsp);
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tsp->tv_nsec = (dh % 100) * 10000000;
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fattime2timespec(dd, dt, dh, 1, tsp);
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smb_time_server2local(tsp->tv_sec, tzoff, tsp);
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}
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static int
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