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Bob Moore73bbca02014-07-30 12:21:13 +08001/******************************************************************************
2 *
3 * Module Name: uthex -- Hex/ASCII support functions
4 *
5 *****************************************************************************/
6
7/*
Bob Moorec8100dc2016-01-15 08:17:03 +08008 * Copyright (C) 2000 - 2016, Intel Corp.
Bob Moore73bbca02014-07-30 12:21:13 +08009 * 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 */
LABBE Corentinc118abc2015-12-29 13:54:04 +080051static const char acpi_gbl_hex_to_ascii[] = {
Bob Moore73bbca02014-07-30 12:21:13 +080052 '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 *
Bob Moore5ebd2ea2016-09-07 14:14:30 +080078 * FUNCTION: acpi_ut_ascii_to_hex_byte
79 *
80 * PARAMETERS: two_ascii_chars - Pointer to two ASCII characters
81 * return_byte - Where converted byte is returned
82 *
83 * RETURN: Status and converted hex byte
84 *
85 * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
86 * to a single converted byte value.
87 *
88 ******************************************************************************/
89
90acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
91{
92
93 /* Both ASCII characters must be valid hex digits */
94
Bob Mooreeacce4b2016-09-07 14:06:10 +080095 if (!isxdigit((int)two_ascii_chars[0]) ||
96 !isxdigit((int)two_ascii_chars[1])) {
Bob Moore5ebd2ea2016-09-07 14:14:30 +080097 return (AE_BAD_HEX_CONSTANT);
98 }
99
100 *return_byte =
101 acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
102 (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
103
104 return (AE_OK);
105}
106
107/*******************************************************************************
108 *
Bob Moore04f8e382015-05-21 10:31:58 +0800109 * FUNCTION: acpi_ut_ascii_char_to_hex
Bob Moore73bbca02014-07-30 12:21:13 +0800110 *
Bob Moore5ebd2ea2016-09-07 14:14:30 +0800111 * PARAMETERS: hex_char - Hex character in Ascii. Must be:
112 * 0-9 or A-F or a-f
Bob Moore73bbca02014-07-30 12:21:13 +0800113 *
114 * RETURN: The binary value of the ascii/hex character
115 *
116 * DESCRIPTION: Perform ascii-to-hex translation
117 *
118 ******************************************************************************/
119
120u8 acpi_ut_ascii_char_to_hex(int hex_char)
121{
122
Bob Moore5ebd2ea2016-09-07 14:14:30 +0800123 /* Values 0-9 */
124
125 if (hex_char <= '9') {
126 return ((u8)(hex_char - '0'));
Bob Moore73bbca02014-07-30 12:21:13 +0800127 }
128
Bob Moore5ebd2ea2016-09-07 14:14:30 +0800129 /* Upper case A-F */
130
131 if (hex_char <= 'F') {
Bob Moore73bbca02014-07-30 12:21:13 +0800132 return ((u8)(hex_char - 0x37));
133 }
134
Bob Moore5ebd2ea2016-09-07 14:14:30 +0800135 /* Lower case a-f */
136
Bob Moore73bbca02014-07-30 12:21:13 +0800137 return ((u8)(hex_char - 0x57));
138}