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EmbeddedPkg/TimeBaseLib: Add function to check Timezone and Daylight 

This adds two functions IsValidTimeZone() and IsValidDaylight() to check
the time zone and daylight value from EFI time. These functions are
retrieved from the RealTimeClockRuntimeDxe module as they reduce
duplicated code in RTC modules.

Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>
This commit is contained in:
Nhi Pham 2021-01-06 23:09:02 +07:00 committed by mergify[bot]
parent ad16388d69
commit e31dc4717c
2 changed files with 83 additions and 2 deletions
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36
EmbeddedPkg/Include/Library/TimeBaseLib.h
View File

@ -83,6 +83,42 @@ IsDayValid (
IN EFI_TIME *Time
);
/**
Check if the time zone is valid.
Valid values are between -1440 and 1440 or 2047 (EFI_UNSPECIFIED_TIMEZONE).
@param TimeZone The time zone to be checked.
@retval TRUE Valid.
@retval FALSE Invalid.
**/
BOOLEAN
EFIAPI
IsValidTimeZone (
IN INT16 TimeZone
);
/**
Check if the daylight is valid.
Valid values are:
0 : Time is not affected.
1 : Time is affected, and has not been adjusted for daylight savings.
3 : Time is affected, and has been adjusted for daylight savings.
All other values are invalid.
@param Daylight The daylight to be checked.
@retval TRUE Valid.
@retval FALSE Invalid.
**/
BOOLEAN
EFIAPI
IsValidDaylight (
IN INT8 Daylight
);
/**
Check if the UEFI time is valid.

49
EmbeddedPkg/Library/TimeBaseLib/TimeBaseLib.c
View File

@ -210,6 +210,51 @@ IsDayValid (
return TRUE;
}
/**
Check if the time zone is valid.
Valid values are between -1440 and 1440 or 2047 (EFI_UNSPECIFIED_TIMEZONE).
@param TimeZone The time zone to be checked.
@retval TRUE Valid.
@retval FALSE Invalid.
**/
BOOLEAN
EFIAPI
IsValidTimeZone (
IN INT16 TimeZone
)
{
return TimeZone == EFI_UNSPECIFIED_TIMEZONE ||
(TimeZone >= -1440 && TimeZone <= 1440);
}
/**
Check if the daylight is valid.
Valid values are:
0 : Time is not affected.
1 : Time is affected, and has not been adjusted for daylight savings.
3 : Time is affected, and has been adjusted for daylight savings.
All other values are invalid.
@param Daylight The daylight to be checked.
@retval TRUE Valid.
@retval FALSE Invalid.
**/
BOOLEAN
EFIAPI
IsValidDaylight (
IN INT8 Daylight
)
{
return Daylight == 0 ||
Daylight == EFI_TIME_ADJUST_DAYLIGHT ||
Daylight == (EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT);
}
/**
Check if the UEFI time is valid.
@ -235,8 +280,8 @@ IsTimeValid (
(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)))) {
(!IsValidTimeZone(Time->TimeZone)) ||
(!IsValidDaylight(Time->Daylight))) {
return FALSE;
}