139 lines
4.6 KiB
C
139 lines
4.6 KiB
C
/******************************************************************************
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*
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* Module Name: uthex -- Hex/ASCII support functions
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_COMPILER
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ACPI_MODULE_NAME("uthex")
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/* Hex to ASCII conversion table */
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static const char acpi_gbl_hex_to_ascii[] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
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'E', 'F'
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};
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_hex_to_ascii_char
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*
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* PARAMETERS: integer - Contains the hex digit
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* position - bit position of the digit within the
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* integer (multiple of 4)
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*
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* RETURN: The converted Ascii character
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*
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* DESCRIPTION: Convert a hex digit to an Ascii character
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*
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******************************************************************************/
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char acpi_ut_hex_to_ascii_char(u64 integer, u32 position)
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{
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return (acpi_gbl_hex_to_ascii[(integer >> position) & 0xF]);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_ascii_to_hex_byte
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*
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* PARAMETERS: two_ascii_chars - Pointer to two ASCII characters
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* return_byte - Where converted byte is returned
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*
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* RETURN: Status and converted hex byte
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*
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* DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
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* to a single converted byte value.
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*
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******************************************************************************/
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acpi_status acpi_ut_ascii_to_hex_byte(char *two_ascii_chars, u8 *return_byte)
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{
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/* Both ASCII characters must be valid hex digits */
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if (!isxdigit((int)two_ascii_chars[0]) ||
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!isxdigit((int)two_ascii_chars[1])) {
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return (AE_BAD_HEX_CONSTANT);
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}
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*return_byte =
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acpi_ut_ascii_char_to_hex(two_ascii_chars[1]) |
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(acpi_ut_ascii_char_to_hex(two_ascii_chars[0]) << 4);
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_ascii_char_to_hex
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*
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* PARAMETERS: hex_char - Hex character in Ascii. Must be:
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* 0-9 or A-F or a-f
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*
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* RETURN: The binary value of the ascii/hex character
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*
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* DESCRIPTION: Perform ascii-to-hex translation
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*
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******************************************************************************/
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u8 acpi_ut_ascii_char_to_hex(int hex_char)
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{
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/* Values 0-9 */
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if (hex_char <= '9') {
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return ((u8)(hex_char - '0'));
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}
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/* Upper case A-F */
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if (hex_char <= 'F') {
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return ((u8)(hex_char - 0x37));
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}
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/* Lower case a-f */
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return ((u8)(hex_char - 0x57));
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}
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