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mtime for UDF support

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-10 17:37:32 +01:00
parent 5706da0443
commit f22c12e852
3 changed files with 111 additions and 88 deletions
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73
include/grub/datetime.h
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@ -51,5 +51,78 @@ char *grub_get_weekday_name (struct grub_datetime *datetime);
void grub_unixtime2datetime (grub_int32_t nix,
struct grub_datetime *datetime);
static inline int
grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
{
grub_int32_t ret;
int y4, ay;
const grub_uint16_t monthssum[12]
= { 0,
31,
31 + 28,
31 + 28 + 31,
31 + 28 + 31 + 30,
31 + 28 + 31 + 30 + 31,
31 + 28 + 31 + 30 + 31 + 30,
31 + 28 + 31 + 30 + 31 + 30 + 31,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30};
const grub_uint8_t months[12] = {31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31};
const int SECPERMIN = 60;
const int SECPERHOUR = 60 * SECPERMIN;
const int SECPERDAY = 24 * SECPERHOUR;
const int SECPERYEAR = 365 * SECPERDAY;
const int SECPER4YEARS = 4 * SECPERYEAR + SECPERDAY;
if (datetime->year > 2038 || datetime->year < 1901)
return 0;
if (datetime->month > 12 || datetime->month < 1)
return 0;
/* In the period of validity of unixtime all years divisible by 4
are bissextile*/
/* Convenience: let's have 3 consecutive non-bissextile years
at the beginning of the epoch. So count from 1971 instead of 1970 */
ret = SECPERYEAR + SECPERDAY;
/* Transform C divisions and modulos to mathematical ones */
y4 = (datetime->year - 1971) / 4;
if (datetime->year < 1971)
y4--;
ay = datetime->year - 1971 - 4 * y4;
ret += y4 * SECPER4YEARS;
ret += ay * SECPERYEAR;
ret += monthssum[datetime->month - 1] * SECPERDAY;
if (ay == 0 && datetime->month >= 3)
ret += SECPERDAY;
ret += (datetime->day - 1) * SECPERDAY;
if ((datetime->day > months[datetime->month - 1]
&& (!ay || datetime->month != 2 || datetime->day != 29))
|| datetime->day < 1)
return 0;
ret += datetime->hour * SECPERHOUR;
if (datetime->hour > 23)
return 0;
ret += datetime->minute * 60;
if (datetime->minute > 59)
return 0;
ret += datetime->second;
/* Accept leap seconds. */
if (datetime->second > 60)
return 0;
if ((datetime->year > 1980 && ret < 0)
|| (datetime->year < 1960 && ret > 0))
return 0;
*nix = ret;
return 1;
}
#endif /* ! KERNEL_DATETIME_HEADER */