| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: uthex -- Hex/ASCII support functions |
| * |
| * Copyright (C) 2000 - 2022, Intel Corp. |
| * |
| *****************************************************************************/ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| |
| #define _COMPONENT ACPI_COMPILER |
| ACPI_MODULE_NAME("uthex") |
| |
| /* Hex to ASCII conversion table */ |
| static const char acpi_gbl_hex_to_ascii[] = { |
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', |
| 'E', 'F' |
| }; |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_hex_to_ascii_char |
| * |
| * PARAMETERS: integer - Contains the hex digit |
| * position - bit position of the digit within the |
| * integer (multiple of 4) |
| * |
| * RETURN: The converted Ascii character |
| * |
| * DESCRIPTION: Convert a hex digit to an Ascii character |
| * |
| ******************************************************************************/ |
| |
| char acpi_ut_hex_to_ascii_char(u64 integer, u32 position) |
| { |
| u64 index; |
| |
| acpi_ut_short_shift_right(integer, position, &index); |
| return (acpi_gbl_hex_to_ascii[index & 0xF]); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_ascii_to_hex_byte |
| * |
| * PARAMETERS: two_ascii_chars - Pointer to two ASCII characters |
| * return_byte - Where converted byte is returned |
| * |
| * RETURN: Status and converted hex byte |
| * |
| * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters |
| * to a single converted byte value. |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte) |
| { |
| |
| /* Both ASCII characters must be valid hex digits */ |
| |
| if (!isxdigit((int)two_ascii_chars[0]) || |
| !isxdigit((int)two_ascii_chars[1])) { |
| return (AE_BAD_HEX_CONSTANT); |
| } |
| |
| *return_byte = |
| acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) | |
| (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4); |
| |
| return (AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ut_ascii_char_to_hex |
| * |
| * PARAMETERS: hex_char - Hex character in Ascii. Must be: |
| * 0-9 or A-F or a-f |
| * |
| * RETURN: The binary value of the ascii/hex character |
| * |
| * DESCRIPTION: Perform ascii-to-hex translation |
| * |
| ******************************************************************************/ |
| |
| u8 acpi_ut_ascii_char_to_hex(int hex_char) |
| { |
| |
| /* Values 0-9 */ |
| |
| if (hex_char <= '9') { |
| return ((u8)(hex_char - '0')); |
| } |
| |
| /* Upper case A-F */ |
| |
| if (hex_char <= 'F') { |
| return ((u8)(hex_char - 0x37)); |
| } |
| |
| /* Lower case a-f */ |
| |
| return ((u8)(hex_char - 0x57)); |
| } |