1 /******************************************************************************
2 *
3 * Module Name: uthex -- Hex/ASCII support functions
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2022, 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 MERCHANTABILITY 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.h"
45 #include "accommon.h"
46
47 #define _COMPONENT ACPI_COMPILER
48 ACPI_MODULE_NAME ("uthex")
49
50
51 /* Hex to ASCII conversion table */
52
53 static const char AcpiGbl_HexToAscii[] =
54 {
55 '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
56 };
57
58
59 /*******************************************************************************
60 *
61 * FUNCTION: AcpiUtHexToAsciiChar
62 *
63 * PARAMETERS: Integer - Contains the hex digit
64 * Position - bit position of the digit within the
65 * integer (multiple of 4)
66 *
67 * RETURN: The converted Ascii character
68 *
69 * DESCRIPTION: Convert a hex digit to an Ascii character
70 *
71 ******************************************************************************/
72
73 char
AcpiUtHexToAsciiChar(UINT64 Integer,UINT32 Position)74 AcpiUtHexToAsciiChar (
75 UINT64 Integer,
76 UINT32 Position)
77 {
78 UINT64 Index;
79
80 AcpiUtShortShiftRight (Integer, Position, &Index);
81 return (AcpiGbl_HexToAscii[Index & 0xF]);
82 }
83
84
85 /*******************************************************************************
86 *
87 * FUNCTION: AcpiUtAsciiToHexByte
88 *
89 * PARAMETERS: TwoAsciiChars - Pointer to two ASCII characters
90 * ReturnByte - Where converted byte is returned
91 *
92 * RETURN: Status and converted hex byte
93 *
94 * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
95 * to a single converted byte value.
96 *
97 ******************************************************************************/
98
99 ACPI_STATUS
AcpiUtAsciiToHexByte(char * TwoAsciiChars,UINT8 * ReturnByte)100 AcpiUtAsciiToHexByte (
101 char *TwoAsciiChars,
102 UINT8 *ReturnByte)
103 {
104
105 /* Both ASCII characters must be valid hex digits */
106
107 if (!isxdigit ((int) TwoAsciiChars[0]) ||
108 !isxdigit ((int) TwoAsciiChars[1]))
109 {
110 return (AE_BAD_HEX_CONSTANT);
111 }
112
113 *ReturnByte =
114 AcpiUtAsciiCharToHex (TwoAsciiChars[1]) |
115 (AcpiUtAsciiCharToHex (TwoAsciiChars[0]) << 4);
116
117 return (AE_OK);
118 }
119
120
121 /*******************************************************************************
122 *
123 * FUNCTION: AcpiUtAsciiCharToHex
124 *
125 * PARAMETERS: HexChar - Hex character in Ascii. Must be:
126 * 0-9 or A-F or a-f
127 *
128 * RETURN: The binary value of the ascii/hex character
129 *
130 * DESCRIPTION: Perform ascii-to-hex translation
131 *
132 ******************************************************************************/
133
134 UINT8
AcpiUtAsciiCharToHex(int HexChar)135 AcpiUtAsciiCharToHex (
136 int HexChar)
137 {
138
139 /* Values 0-9 */
140
141 if (HexChar <= '9')
142 {
143 return ((UINT8) (HexChar - '0'));
144 }
145
146 /* Upper case A-F */
147
148 if (HexChar <= 'F')
149 {
150 return ((UINT8) (HexChar - 0x37));
151 }
152
153 /* Lower case a-f */
154
155 return ((UINT8) (HexChar - 0x57));
156 }
157