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1/******************************************************************************
2 *
3 * Module Name: uthex -- Hex/ASCII support functions
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45#include "accommon.h"
46
47#define _COMPONENT ACPI_COMPILER
48ACPI_MODULE_NAME("uthex")
49
50/* Hex to ASCII conversion table */
51static const char acpi_gbl_hex_to_ascii[] = {
52 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
53 'E', 'F'
54};
55
56/*******************************************************************************
57 *
58 * FUNCTION: acpi_ut_hex_to_ascii_char
59 *
60 * PARAMETERS: integer - Contains the hex digit
61 * position - bit position of the digit within the
62 * integer (multiple of 4)
63 *
64 * RETURN: The converted Ascii character
65 *
66 * DESCRIPTION: Convert a hex digit to an Ascii character
67 *
68 ******************************************************************************/
69
70char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
71{
72
73 return (acpi_gbl_hex_to_ascii[(integer >> position) & 0xF]);
74}
75
76/*******************************************************************************
77 *
78 * FUNCTION: acpi_ut_ascii_char_to_hex
79 *
80 * PARAMETERS: hex_char - Hex character in Ascii
81 *
82 * RETURN: The binary value of the ascii/hex character
83 *
84 * DESCRIPTION: Perform ascii-to-hex translation
85 *
86 ******************************************************************************/
87
88u8 acpi_ut_ascii_char_to_hex(int hex_char)
89{
90
91 if (hex_char <= 0x39) {
92 return ((u8)(hex_char - 0x30));
93 }
94
95 if (hex_char <= 0x46) {
96 return ((u8)(hex_char - 0x37));
97 }
98
99 return ((u8)(hex_char - 0x57));
100}
1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: uthex -- Hex/ASCII support functions
5 *
6 * Copyright (C) 2000 - 2020, Intel Corp.
7 *
8 *****************************************************************************/
9
10#include <acpi/acpi.h>
11#include "accommon.h"
12
13#define _COMPONENT ACPI_COMPILER
14ACPI_MODULE_NAME("uthex")
15
16/* Hex to ASCII conversion table */
17static const char acpi_gbl_hex_to_ascii[] = {
18 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
19 'E', 'F'
20};
21
22/*******************************************************************************
23 *
24 * FUNCTION: acpi_ut_hex_to_ascii_char
25 *
26 * PARAMETERS: integer - Contains the hex digit
27 * position - bit position of the digit within the
28 * integer (multiple of 4)
29 *
30 * RETURN: The converted Ascii character
31 *
32 * DESCRIPTION: Convert a hex digit to an Ascii character
33 *
34 ******************************************************************************/
35
36char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
37{
38 u64 index;
39
40 acpi_ut_short_shift_right(integer, position, &index);
41 return (acpi_gbl_hex_to_ascii[index & 0xF]);
42}
43
44/*******************************************************************************
45 *
46 * FUNCTION: acpi_ut_ascii_to_hex_byte
47 *
48 * PARAMETERS: two_ascii_chars - Pointer to two ASCII characters
49 * return_byte - Where converted byte is returned
50 *
51 * RETURN: Status and converted hex byte
52 *
53 * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
54 * to a single converted byte value.
55 *
56 ******************************************************************************/
57
58acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
59{
60
61 /* Both ASCII characters must be valid hex digits */
62
63 if (!isxdigit((int)two_ascii_chars[0]) ||
64 !isxdigit((int)two_ascii_chars[1])) {
65 return (AE_BAD_HEX_CONSTANT);
66 }
67
68 *return_byte =
69 acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
70 (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
71
72 return (AE_OK);
73}
74
75/*******************************************************************************
76 *
77 * FUNCTION: acpi_ut_ascii_char_to_hex
78 *
79 * PARAMETERS: hex_char - Hex character in Ascii. Must be:
80 * 0-9 or A-F or a-f
81 *
82 * RETURN: The binary value of the ascii/hex character
83 *
84 * DESCRIPTION: Perform ascii-to-hex translation
85 *
86 ******************************************************************************/
87
88u8 acpi_ut_ascii_char_to_hex(int hex_char)
89{
90
91 /* Values 0-9 */
92
93 if (hex_char <= '9') {
94 return ((u8)(hex_char - '0'));
95 }
96
97 /* Upper case A-F */
98
99 if (hex_char <= 'F') {
100 return ((u8)(hex_char - 0x37));
101 }
102
103 /* Lower case a-f */
104
105 return ((u8)(hex_char - 0x57));
106}