filesystem mtime support for iso9660
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@ -27,6 +27,7 @@
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#include <grub/types.h>
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#include <grub/fshelp.h>
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#include <grub/charset.h>
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#include <grub/datetime.h>
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#define GRUB_ISO9660_FSTYPE_DIR 0040000
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#define GRUB_ISO9660_FSTYPE_REG 0100000
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@ -153,6 +154,108 @@ struct grub_fshelp_node
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static grub_dl_t my_mod;
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#define SECPERMIN 60
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#define SECPERHOUR (60*SECPERMIN)
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#define SECPERDAY (24*SECPERHOUR)
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#define SECPERYEAR (365*SECPERDAY)
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#define SECPER4YEARS (4*SECPERYEAR+SECPERDAY)
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static grub_err_t
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grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
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{
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grub_int32_t ret;
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int y4, ay;
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grub_uint16_t monthssum[12]
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= { 0,
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31,
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31 + 28,
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31 + 28 + 31,
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31 + 28 + 31 + 30,
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31 + 28 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30};
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grub_uint8_t months[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if (datetime->year > 2038 || datetime->year < 1902)
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "outside of UNIX epoch");
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if (datetime->month > 12 || datetime->month < 1)
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return grub_error (GRUB_ERR_BAD_NUMBER, "not a valid month");
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/* In the period of validity of unixtime all years divisible by 4
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are bissextile*/
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/* Convenience: let's have 3 consecutive non-bissextile years
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at the beginning of the epoch. So count from 1973 instead of 1970 */
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ret = 3*SECPERYEAR + SECPERDAY;
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/* Transform C divisions and modulos to mathematical ones */
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y4 = (datetime->year - 1973) / 4;
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if (datetime->year < 1973)
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y4--;
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ay = datetime->year - 1973 - 4 * y4;
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ret += y4 * SECPER4YEARS;
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ret += ay * SECPERYEAR;
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ret += monthssum[datetime->month - 1] * SECPERDAY;
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if (ay == 0 && datetime->month >= 3)
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ret += SECPERDAY;
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ret += (datetime->day - 1) * SECPERDAY;
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if ((datetime->day > months[datetime->month - 1]
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&& (!ay || datetime->month != 2 || datetime->day != 29))
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|| datetime->day < 1)
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return grub_error (GRUB_ERR_BAD_NUMBER, "invalid day");
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ret += datetime->hour * SECPERHOUR;
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if (datetime->hour > 23)
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return grub_error (GRUB_ERR_BAD_NUMBER, "invalid hour");
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ret += datetime->minute * 60;
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if (datetime->minute > 59)
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return grub_error (GRUB_ERR_BAD_NUMBER, "invalid minute");
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ret += datetime->second;
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/* Accept leap seconds. */
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if (datetime->second > 60)
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return grub_error (GRUB_ERR_BAD_NUMBER, "invalid second");
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if ((datetime->year > 1980 && ret < 0)
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|| (datetime->year < 1960 && ret > 0))
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return grub_error (GRUB_ERR_OUT_OF_RANGE, "outside of UNIX epoch");
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*nix = ret;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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iso9660_to_unixtime (const struct grub_iso9660_date *i, grub_int32_t *nix)
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{
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grub_err_t err;
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struct grub_datetime datetime;
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if (! i->year[0] && ! i->year[1]
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&& ! i->year[2] && ! i->year[3]
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&& ! i->month[0] && ! i->month[1]
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&& ! i->day[0] && ! i->day[1]
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&& ! i->hour[0] && ! i->hour[1]
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&& ! i->minute[0] && ! i->minute[1]
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&& ! i->second[0] && ! i->second[1]
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&& ! i->hundredth[0] && ! i->hundredth[1])
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return grub_error (GRUB_ERR_BAD_NUMBER, "empty date");
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datetime.year = (i->year[0] - '0') * 1000 + (i->year[1] - '0') * 100
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+ (i->year[2] - '0') * 10 + (i->year[3] - '0');
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datetime.month = (i->month[0] - '0') * 10 + (i->month[1] - '0');
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datetime.day = (i->day[0] - '0') * 10 + (i->day[1] - '0');
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datetime.hour = (i->hour[0] - '0') * 10 + (i->hour[1] - '0');
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datetime.minute = (i->minute[0] - '0') * 10 + (i->minute[1] - '0');
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datetime.second = (i->second[0] - '0') * 10 + (i->second[1] - '0');
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err = grub_datetime2unixtime (&datetime, nix);
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*nix -= i->offset * 60 * 15;
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return err;
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}
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/* Iterate over the susp entries, starting with block SUA_BLOCK on the
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offset SUA_POS with a size of SUA_SIZE bytes. Hook is called for
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every entry. */
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@ -871,6 +974,32 @@ grub_iso9660_uuid (grub_device_t device, char **uuid)
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return grub_errno;
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}
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/* Get writing time of filesystem. */
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static grub_err_t
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grub_iso9660_mtime (grub_device_t device, grub_int32_t *timebuf)
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{
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struct grub_iso9660_data *data;
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grub_disk_t disk = device->disk;
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grub_err_t err;
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grub_dl_ref (my_mod);
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data = grub_iso9660_mount (disk);
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if (!data)
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{
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grub_dl_unref (my_mod);
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return grub_errno;
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}
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err = iso9660_to_unixtime (&data->voldesc.modified, timebuf);
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grub_dl_unref (my_mod);
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grub_free (data);
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return err;
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}
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static struct grub_fs grub_iso9660_fs =
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@ -882,6 +1011,7 @@ static struct grub_fs grub_iso9660_fs =
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.close = grub_iso9660_close,
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.label = grub_iso9660_label,
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.uuid = grub_iso9660_uuid,
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.mtime = grub_iso9660_mtime,
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.next = 0
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};
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