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/******************************************************************************
*
* Module Name: uthex -- Hex/ASCII support functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2018, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#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));
}
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