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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: uthex -- Hex/ASCII support functions | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
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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 | |
48 | ACPI_MODULE_NAME("uthex") | |
49 | ||
50 | /* Hex to ASCII conversion table */ | |
c118abc5 | 51 | static const char acpi_gbl_hex_to_ascii[] = { |
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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 | ||
70 | char acpi_ut_hex_to_ascii_char(u64 integer, u32 position) | |
71 | { | |
72 | ||
73 | return (acpi_gbl_hex_to_ascii[(integer >> position) & 0xF]); | |
74 | } | |
75 | ||
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76 | /******************************************************************************* |
77 | * | |
78 | * 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 | ||
90 | acpi_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 | ||
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95 | if (!isxdigit((int)two_ascii_chars[0]) || |
96 | !isxdigit((int)two_ascii_chars[1])) { | |
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97 | 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 | ||
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107 | /******************************************************************************* |
108 | * | |
04f8e384 | 109 | * FUNCTION: acpi_ut_ascii_char_to_hex |
73bbca04 | 110 | * |
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111 | * PARAMETERS: hex_char - Hex character in Ascii. Must be: |
112 | * 0-9 or A-F or a-f | |
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113 | * |
114 | * RETURN: The binary value of the ascii/hex character | |
115 | * | |
116 | * DESCRIPTION: Perform ascii-to-hex translation | |
117 | * | |
118 | ******************************************************************************/ | |
119 | ||
120 | u8 acpi_ut_ascii_char_to_hex(int hex_char) | |
121 | { | |
122 | ||
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123 | /* Values 0-9 */ |
124 | ||
125 | if (hex_char <= '9') { | |
126 | return ((u8)(hex_char - '0')); | |
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127 | } |
128 | ||
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129 | /* Upper case A-F */ |
130 | ||
131 | if (hex_char <= 'F') { | |
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132 | return ((u8)(hex_char - 0x37)); |
133 | } | |
134 | ||
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135 | /* Lower case a-f */ |
136 | ||
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137 | return ((u8)(hex_char - 0x57)); |
138 | } |