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DynamicTablesPkg: Add HexFromAscii() to AcpiHelperLib 

Add HexFromAscii(), converting an hexadecimal ascii char
to an integer.

Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
This commit is contained in:
Pierre Gondois 2021-09-30 08:48:15 +01:00 committed by mergify[bot]
parent 1ad5182500
commit 653113412f
2 changed files with 46 additions and 0 deletions
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15
DynamicTablesPkg/Include/Library/AcpiHelperLib.h
View File

@ -34,6 +34,21 @@ AsciiFromHex (
IN UINT8 Hex
);
/** Convert an ASCII char representing an hexadecimal number
to its integer value.
@param [in] Char Char to convert.
Must be between '0'-'9' or 'A'-'F' or 'a'-'f'.
@return The corresponding integer (between 0-16).
-1 if error.
**/
UINT8
EFIAPI
HexFromAscii (
IN CHAR8 Char
);
/** Check if a HID is a valid PNP ID.
@param [in] Hid The Hid to validate.

31
DynamicTablesPkg/Library/Common/AcpiHelperLib/AcpiHelper.c
View File

@ -38,6 +38,37 @@ AsciiFromHex (
return (UINT8)-1;
}
/** Convert an ASCII char representing an hexadecimal number
to its integer value.
@param [in] Char Char to convert.
Must be between '0'-'9' or 'A'-'F' or 'a'-'f'.
@return The corresponding integer (between 0-16).
-1 if error.
**/
UINT8
EFIAPI
HexFromAscii (
IN CHAR8 Char
)
{
if ((Char >= '0') && (Char <= '9')) {
return (UINT8)(Char - '0');
}
if ((Char >= 'A') && (Char <= 'F')) {
return (UINT8)(Char - 'A' + 10);
}
if ((Char >= 'a') && (Char <= 'f')) {
return (UINT8)(Char - 'a' + 10);
}
ASSERT (FALSE);
return (UINT8)-1;
}
/** Check if a HID is a valid PNP ID.
@param [in] Hid The Hid to validate.