131 lines
2.4 KiB
C
131 lines
2.4 KiB
C
/*
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* linux/fs/isofs/util.c
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*
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* The special functions in the file are numbered according to the section
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* of the iso 9660 standard in which they are described. isonum_733 will
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* convert numbers according to section 7.3.3, etc.
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*
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* isofs special functions. This file was lifted in its entirety from
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* the bsd386 iso9660 filesystem, by Pace Williamson.
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*/
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int
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isonum_711 (char * p)
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{
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return (*p & 0xff);
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}
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int
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isonum_712 (char * p)
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{
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int val;
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val = *p;
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if (val & 0x80)
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val |= 0xffffff00;
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return (val);
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}
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int
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isonum_721 (char * p)
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{
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return ((p[0] & 0xff) | ((p[1] & 0xff) << 8));
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}
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int
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isonum_722 (char * p)
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{
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return (((p[0] & 0xff) << 8) | (p[1] & 0xff));
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}
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int
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isonum_723 (char * p)
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{
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#if 0
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if (p[0] != p[3] || p[1] != p[2]) {
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fprintf (stderr, "invalid format 7.2.3 number\n");
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exit (1);
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}
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#endif
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return (isonum_721 (p));
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}
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int
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isonum_731 (char * p)
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{
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return ((p[0] & 0xff)
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| ((p[1] & 0xff) << 8)
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| ((p[2] & 0xff) << 16)
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| ((p[3] & 0xff) << 24));
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}
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int
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isonum_732 (char * p)
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{
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return (((p[0] & 0xff) << 24)
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| ((p[1] & 0xff) << 16)
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| ((p[2] & 0xff) << 8)
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| (p[3] & 0xff));
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}
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int
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isonum_733 (char * p)
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{
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#if 0
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int i;
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for (i = 0; i < 4; i++) {
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if (p[i] != p[7-i]) {
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fprintf (stderr, "bad format 7.3.3 number\n");
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exit (1);
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}
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}
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#endif
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return (isonum_731 (p));
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}
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/* We have to convert from a MM/DD/YY format to the unix ctime format. We have to
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take into account leap years and all of that good stuff. Unfortunately, the kernel
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does not have the information on hand to take into account daylight savings time,
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so there will be cases (roughly half the time) where the dates are off by one hour. */
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int iso_date(char * p, int flag)
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{
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int year, month, day, hour ,minute, second, tz;
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int crtime, days, i;
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year = p[0] - 70;
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month = p[1];
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day = p[2];
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hour = p[3];
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minute = p[4];
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second = p[5];
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if (flag == 0) tz = p[6]; /* High sierra has no time zone */
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else tz = 0;
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if (year < 0) {
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crtime = 0;
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} else {
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int monlen[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
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days = year * 365;
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if (year > 2)
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days += (year+1) / 4;
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for (i = 1; i < month; i++)
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days += monlen[i-1];
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if (((year+2) % 4) == 0 && month > 2)
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days++;
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days += day - 1;
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crtime = ((((days * 24) + hour) * 60 + minute) * 60)
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+ second;
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/* sign extend */
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if (tz & 0x80)
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tz |= (-1 << 8);
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/* timezone offset is unreliable on some disks */
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if (-48 <= tz && tz <= 52)
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crtime += tz * 15 * 60;
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}
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return crtime;
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}
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