// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
/******************************************************************************
|
*
|
* Module Name: uthex -- Hex/ASCII support functions
|
*
|
* Copyright (C) 2000 - 2020, Intel Corp.
|
*
|
*****************************************************************************/
|
|
#include <acpi/acpi.h>
|
#include "accommon.h"
|
|
#define _COMPONENT ACPI_COMPILER
|
ACPI_MODULE_NAME("uthex")
|
|
/* Hex to ASCII conversion table */
|
static const char acpi_gbl_hex_to_ascii[] = {
|
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
|
'E', 'F'
|
};
|
|
/*******************************************************************************
|
*
|
* FUNCTION: acpi_ut_hex_to_ascii_char
|
*
|
* PARAMETERS: integer - Contains the hex digit
|
* position - bit position of the digit within the
|
* integer (multiple of 4)
|
*
|
* RETURN: The converted Ascii character
|
*
|
* DESCRIPTION: Convert a hex digit to an Ascii character
|
*
|
******************************************************************************/
|
|
char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
|
{
|
u64 index;
|
|
acpi_ut_short_shift_right(integer, position, &index);
|
return (acpi_gbl_hex_to_ascii[index & 0xF]);
|
}
|
|
/*******************************************************************************
|
*
|
* FUNCTION: acpi_ut_ascii_to_hex_byte
|
*
|
* PARAMETERS: two_ascii_chars - Pointer to two ASCII characters
|
* return_byte - Where converted byte is returned
|
*
|
* RETURN: Status and converted hex byte
|
*
|
* DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
|
* to a single converted byte value.
|
*
|
******************************************************************************/
|
|
acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
|
{
|
|
/* Both ASCII characters must be valid hex digits */
|
|
if (!isxdigit((int)two_ascii_chars[0]) ||
|
!isxdigit((int)two_ascii_chars[1])) {
|
return (AE_BAD_HEX_CONSTANT);
|
}
|
|
*return_byte =
|
acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
|
(acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
|
|
return (AE_OK);
|
}
|
|
/*******************************************************************************
|
*
|
* FUNCTION: acpi_ut_ascii_char_to_hex
|
*
|
* PARAMETERS: hex_char - Hex character in Ascii. Must be:
|
* 0-9 or A-F or a-f
|
*
|
* RETURN: The binary value of the ascii/hex character
|
*
|
* DESCRIPTION: Perform ascii-to-hex translation
|
*
|
******************************************************************************/
|
|
u8 acpi_ut_ascii_char_to_hex(int hex_char)
|
{
|
|
/* Values 0-9 */
|
|
if (hex_char <= '9') {
|
return ((u8)(hex_char - '0'));
|
}
|
|
/* Upper case A-F */
|
|
if (hex_char <= 'F') {
|
return ((u8)(hex_char - 0x37));
|
}
|
|
/* Lower case a-f */
|
|
return ((u8)(hex_char - 0x57));
|
}
|
