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/** @file
*
* Copyright (c) 2016, Hisilicon Limited. All rights reserved.
* Copyright (c) 2016-2019, Linaro Limited. All rights reserved.
* Copyright (c) 2021, Ampere Computing LLC. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <Uefi/UefiBaseType.h>
#include <Uefi/UefiSpec.h>
#include <Library/DebugLib.h>
#include <Library/TimeBaseLib.h>
/**
Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to EFI_TIME.
@param EpochSeconds Epoch seconds.
@param Time The time converted to UEFI format.
**/
VOID
EFIAPI
EpochToEfiTime (
IN UINTN EpochSeconds,
OUT EFI_TIME *Time
)
{
UINTN a;
UINTN b;
UINTN c;
UINTN d;
UINTN g;
UINTN j;
UINTN m;
UINTN y;
UINTN da;
UINTN db;
UINTN dc;
UINTN dg;
UINTN hh;
UINTN mm;
UINTN ss;
UINTN J;
J = (EpochSeconds / 86400) + 2440588;
j = J + 32044;
g = j / 146097;
dg = j % 146097;
c = (((dg / 36524) + 1) * 3) / 4;
dc = dg - (c * 36524);
b = dc / 1461;
db = dc % 1461;
a = (((db / 365) + 1) * 3) / 4;
da = db - (a * 365);
y = (g * 400) + (c * 100) + (b * 4) + a;
m = (((da * 5) + 308) / 153) - 2;
d = da - (((m + 4) * 153) / 5) + 122;
Time->Year = (UINT16)(y - 4800 + ((m + 2) / 12));
Time->Month = ((m + 2) % 12) + 1;
Time->Day = (UINT8)(d + 1);
ss = EpochSeconds % 60;
a = (EpochSeconds - ss) / 60;
mm = a % 60;
b = (a - mm) / 60;
hh = b % 24;
Time->Hour = (UINT8)hh;
Time->Minute = (UINT8)mm;
Time->Second = (UINT8)ss;
Time->Nanosecond = 0;
}
/**
Calculate Epoch days.
@param Time The UEFI time to be calculated.
@return Number of days.
**/
UINTN
EFIAPI
EfiGetEpochDays (
IN EFI_TIME *Time
)
{
UINTN a;
UINTN y;
UINTN m;
UINTN JulianDate; // Absolute Julian Date representation of the supplied Time
UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY
a = (14 - Time->Month) / 12 ;
y = Time->Year + 4800 - a;
m = Time->Month + (12*a) - 3;
JulianDate = Time->Day + ((153*m + 2)/5) + (365*y) + (y/4) - (y/100) + (y/400) - 32045;
ASSERT (JulianDate >= EPOCH_JULIAN_DATE);
EpochDays = JulianDate - EPOCH_JULIAN_DATE;
return EpochDays;
}
/**
Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC).
@param Time The UEFI time to be converted.
@return Number of seconds.
**/
UINTN
EFIAPI
EfiTimeToEpoch (
IN EFI_TIME *Time
)
{
UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY
UINTN EpochSeconds;
EpochDays = EfiGetEpochDays (Time);
EpochSeconds = (EpochDays * SEC_PER_DAY) + ((UINTN)Time->Hour * SEC_PER_HOUR) + (Time->Minute * SEC_PER_MIN) + Time->Second;
return EpochSeconds;
}
/**
Get the day of the week from the UEFI time.
@param Time The UEFI time to be calculated.
@return The day of the week: Sunday=0, Monday=1, ... Saturday=6
**/
UINTN
EfiTimeToWday (
IN EFI_TIME *Time
)
{
UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY
EpochDays = EfiGetEpochDays (Time);
// 4=1/1/1970 was a Thursday
return (EpochDays + 4) % 7;
}
/**
Check if it is a leap year.
@param Time The UEFI time to be checked.
@retval TRUE It is a leap year.
@retval FALSE It is NOT a leap year.
**/
BOOLEAN
EFIAPI
IsLeapYear (
IN EFI_TIME *Time
)
{
if (Time->Year % 4 == 0) {
if (Time->Year % 100 == 0) {
if (Time->Year % 400 == 0) {
return TRUE;
} else {
return FALSE;
}
} else {
return TRUE;
}
} else {
return FALSE;
}
}
/**
Check if the day in the UEFI time is valid.
@param Time The UEFI time to be checked.
@retval TRUE Valid.
@retval FALSE Invalid.
**/
BOOLEAN
EFIAPI
IsDayValid (
IN EFI_TIME *Time
)
{
STATIC CONST INTN DayOfMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if (Time->Day < 1 ||
Time->Day > DayOfMonth[Time->Month - 1] ||
(Time->Month == 2 && (!IsLeapYear (Time) && Time->Day > 28))
) {
return FALSE;
}
return TRUE;
}
/**
Check if the UEFI time is valid.
@param Time The UEFI time to be checked.
@retval TRUE Valid.
@retval FALSE Invalid.
**/
BOOLEAN
EFIAPI
IsTimeValid(
IN EFI_TIME *Time
)
{
// Check the input parameters are within the range specified by UEFI
if ((Time->Year < 2000) ||
(Time->Year > 2099) ||
(Time->Month < 1 ) ||
(Time->Month > 12 ) ||
(!IsDayValid (Time) ) ||
(Time->Hour > 23 ) ||
(Time->Minute > 59 ) ||
(Time->Second > 59 ) ||
(Time->Nanosecond > 999999999) ||
(!((Time->TimeZone == EFI_UNSPECIFIED_TIMEZONE) || ((Time->TimeZone >= -1440) && (Time->TimeZone <= 1440)))) ||
(Time->Daylight & (~(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT)))
) {
return FALSE;
}
return TRUE;
}
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