107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: uthex -- Hex/ASCII support functions
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME("uthex")
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/* Hex to ASCII conversion table */
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static const char acpi_gbl_hex_to_ascii[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
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'E', 'F'
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};
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_hex_to_ascii_char
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*
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* PARAMETERS: integer - Contains the hex digit
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* position - bit position of the digit within the
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* integer (multiple of 4)
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*
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* RETURN: The converted Ascii character
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*
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* DESCRIPTION: Convert a hex digit to an Ascii character
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*
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******************************************************************************/
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char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
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{
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u64 index;
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acpi_ut_short_shift_right(integer, position, &index);
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return (acpi_gbl_hex_to_ascii[index & 0xF]);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_ascii_to_hex_byte
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*
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* PARAMETERS: two_ascii_chars - Pointer to two ASCII characters
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* return_byte - Where converted byte is returned
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*
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* RETURN: Status and converted hex byte
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*
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* DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
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* to a single converted byte value.
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*
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******************************************************************************/
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acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
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{
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/* Both ASCII characters must be valid hex digits */
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if (!isxdigit((int)two_ascii_chars[0]) ||
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!isxdigit((int)two_ascii_chars[1])) {
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return (AE_BAD_HEX_CONSTANT);
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}
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*return_byte =
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acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
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(acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_ascii_char_to_hex
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*
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* PARAMETERS: hex_char - Hex character in Ascii. Must be:
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* 0-9 or A-F or a-f
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*
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* RETURN: The binary value of the ascii/hex character
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*
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* DESCRIPTION: Perform ascii-to-hex translation
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*
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******************************************************************************/
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u8 acpi_ut_ascii_char_to_hex(int hex_char)
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{
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/* Values 0-9 */
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if (hex_char <= '9') {
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return ((u8)(hex_char - '0'));
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}
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/* Upper case A-F */
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if (hex_char <= 'F') {
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return ((u8)(hex_char - 0x37));
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}
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/* Lower case a-f */
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return ((u8)(hex_char - 0x57));
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}
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