| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: uthex -- Hex/ASCII support functions |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2017, 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 |
| 48 | ACPI_MODULE_NAME("uthex") |
| 49 | |
| 50 | /* Hex to ASCII conversion table */ |
| 51 | static 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 | |
| 70 | char acpi_ut_hex_to_ascii_char(u64 integer, u32 position) |
| 71 | { |
| 72 | u64 index; |
| 73 | |
| 74 | acpi_ut_short_shift_right(integer, position, &index); |
| 75 | return (acpi_gbl_hex_to_ascii[index & 0xF]); |
| 76 | } |
| 77 | |
| 78 | /******************************************************************************* |
| 79 | * |
| 80 | * FUNCTION: acpi_ut_ascii_to_hex_byte |
| 81 | * |
| 82 | * PARAMETERS: two_ascii_chars - Pointer to two ASCII characters |
| 83 | * return_byte - Where converted byte is returned |
| 84 | * |
| 85 | * RETURN: Status and converted hex byte |
| 86 | * |
| 87 | * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters |
| 88 | * to a single converted byte value. |
| 89 | * |
| 90 | ******************************************************************************/ |
| 91 | |
| 92 | acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte) |
| 93 | { |
| 94 | |
| 95 | /* Both ASCII characters must be valid hex digits */ |
| 96 | |
| 97 | if (!isxdigit((int)two_ascii_chars[0]) || |
| 98 | !isxdigit((int)two_ascii_chars[1])) { |
| 99 | return (AE_BAD_HEX_CONSTANT); |
| 100 | } |
| 101 | |
| 102 | *return_byte = |
| 103 | acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) | |
| 104 | (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4); |
| 105 | |
| 106 | return (AE_OK); |
| 107 | } |
| 108 | |
| 109 | /******************************************************************************* |
| 110 | * |
| 111 | * FUNCTION: acpi_ut_ascii_char_to_hex |
| 112 | * |
| 113 | * PARAMETERS: hex_char - Hex character in Ascii. Must be: |
| 114 | * 0-9 or A-F or a-f |
| 115 | * |
| 116 | * RETURN: The binary value of the ascii/hex character |
| 117 | * |
| 118 | * DESCRIPTION: Perform ascii-to-hex translation |
| 119 | * |
| 120 | ******************************************************************************/ |
| 121 | |
| 122 | u8 acpi_ut_ascii_char_to_hex(int hex_char) |
| 123 | { |
| 124 | |
| 125 | /* Values 0-9 */ |
| 126 | |
| 127 | if (hex_char <= '9') { |
| 128 | return ((u8)(hex_char - '0')); |
| 129 | } |
| 130 | |
| 131 | /* Upper case A-F */ |
| 132 | |
| 133 | if (hex_char <= 'F') { |
| 134 | return ((u8)(hex_char - 0x37)); |
| 135 | } |
| 136 | |
| 137 | /* Lower case a-f */ |
| 138 | |
| 139 | return ((u8)(hex_char - 0x57)); |
| 140 | } |