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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/******************************************************************************3 *4 * Module Name: uthex -- Hex/ASCII support functions5 *6 * Copyright (C) 2000 - 2023, Intel Corp.7 *8 *****************************************************************************/9 10#include <acpi/acpi.h>11#include "accommon.h"12 13#define _COMPONENT ACPI_COMPILER14ACPI_MODULE_NAME("uthex")15 16/* Hex to ASCII conversion table */17static const char acpi_gbl_hex_to_ascii[] = {18 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',19 'E', 'F'20};21 22/*******************************************************************************23 *24 * FUNCTION: acpi_ut_hex_to_ascii_char25 *26 * PARAMETERS: integer - Contains the hex digit27 * position - bit position of the digit within the28 * integer (multiple of 4)29 *30 * RETURN: The converted Ascii character31 *32 * DESCRIPTION: Convert a hex digit to an Ascii character33 *34 ******************************************************************************/35 36char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)37{38 u64 index;39 40 acpi_ut_short_shift_right(integer, position, &index);41 return (acpi_gbl_hex_to_ascii[index & 0xF]);42}43 44/*******************************************************************************45 *46 * FUNCTION: acpi_ut_ascii_to_hex_byte47 *48 * PARAMETERS: two_ascii_chars - Pointer to two ASCII characters49 * return_byte - Where converted byte is returned50 *51 * RETURN: Status and converted hex byte52 *53 * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters54 * to a single converted byte value.55 *56 ******************************************************************************/57 58acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)59{60 61 /* Both ASCII characters must be valid hex digits */62 63 if (!isxdigit((int)two_ascii_chars[0]) ||64 !isxdigit((int)two_ascii_chars[1])) {65 return (AE_BAD_HEX_CONSTANT);66 }67 68 *return_byte =69 acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |70 (acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);71 72 return (AE_OK);73}74 75/*******************************************************************************76 *77 * FUNCTION: acpi_ut_ascii_char_to_hex78 *79 * PARAMETERS: hex_char - Hex character in Ascii. Must be:80 * 0-9 or A-F or a-f81 *82 * RETURN: The binary value of the ascii/hex character83 *84 * DESCRIPTION: Perform ascii-to-hex translation85 *86 ******************************************************************************/87 88u8 acpi_ut_ascii_char_to_hex(int hex_char)89{90 91 /* Values 0-9 */92 93 if (hex_char <= '9') {94 return ((u8)(hex_char - '0'));95 }96 97 /* Upper case A-F */98 99 if (hex_char <= 'F') {100 return ((u8)(hex_char - 0x37));101 }102 103 /* Lower case a-f */104 105 return ((u8)(hex_char - 0x57));106}107