/**
Check whether the input variable is an key option variable.
@param Name Input variable name.
@param Guid Input variable guid.
@param OptionNumber The option number of this key option variable.
@retval TRUE Input variable is a key option variable.
@retval FALSE Input variable is not a key option variable.
**/
BOOLEAN
BmIsKeyOptionVariable (
CHAR16 *Name,
EFI_GUID *Guid,
UINT16 *OptionNumber
)
{
UINTN Index;
UINTN Uint;
if (!CompareGuid (Guid, &gEfiGlobalVariableGuid) ||
(StrSize (Name) != sizeof (L"Key####")) ||
(StrnCmp (Name, L"Key", 3) != 0)
) {
return FALSE;
}
*OptionNumber = 0;
for (Index = 3; Index < 7; Index++) {
Uint = BmCharToUint (Name[Index]);
if (Uint == -1) {
return FALSE;
} else {
*OptionNumber = (UINT16) Uint + *OptionNumber * 0x10;
}
}
return TRUE;
}
/**
Check whether the VariableName is a valid load option variable name
and return the load option type and option number.
@param VariableName The name of the load option variable.
@param OptionType Return the load option type.
@param OptionNumber Return the load option number.
@retval TRUE The variable name is valid; The load option type and
load option number is returned.
@retval FALSE The variable name is NOT valid.
**/
BOOLEAN
BmIsValidLoadOptionVariableName (
IN CHAR16 *VariableName,
OUT EFI_BOOT_MANAGER_LOAD_OPTION_TYPE *OptionType,
OUT UINT16 *OptionNumber
)
{
UINTN VariableNameLen;
UINTN Index;
UINTN Uint;
VariableNameLen = StrLen (VariableName);
if (VariableNameLen <= 4) {
return FALSE;
}
for (Index = 0; Index < sizeof (mBmLoadOptionName) / sizeof (mBmLoadOptionName[0]); Index++) {
if ((VariableNameLen - 4 == StrLen (mBmLoadOptionName[Index])) &&
(StrnCmp (VariableName, mBmLoadOptionName[Index], VariableNameLen - 4) == 0)
) {
break;
}
}
if (Index == sizeof (mBmLoadOptionName) / sizeof (mBmLoadOptionName[0])) {
return FALSE;
}
*OptionType = (EFI_BOOT_MANAGER_LOAD_OPTION_TYPE) Index;
*OptionNumber = 0;
for (Index = VariableNameLen - 4; Index < VariableNameLen; Index++) {
Uint = BmCharToUint (VariableName[Index]);
if (Uint == -1) {
break;
} else {
*OptionNumber = (UINT16) Uint + *OptionNumber * 0x10;
}
}
return (BOOLEAN) (Index == VariableNameLen);
}