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  1. /******************************************************************************
  2.  *
  3.  * Module Name: uthex -- Hex/ASCII support functions
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, 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 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.  
  73.         return (acpi_gbl_hex_to_ascii[(integer >> position) & 0xF]);
  74. }
  75.  
  76. /*******************************************************************************
  77.  *
  78.  * FUNCTION:    acpi_ut_ascii_char_to_hex
  79.  *
  80.  * PARAMETERS:  hex_char                - Hex character in Ascii
  81.  *
  82.  * RETURN:      The binary value of the ascii/hex character
  83.  *
  84.  * DESCRIPTION: Perform ascii-to-hex translation
  85.  *
  86.  ******************************************************************************/
  87.  
  88. u8 acpi_ut_ascii_char_to_hex(int hex_char)
  89. {
  90.  
  91.         if (hex_char <= 0x39) {
  92.                 return ((u8)(hex_char - 0x30));
  93.         }
  94.  
  95.         if (hex_char <= 0x46) {
  96.                 return ((u8)(hex_char - 0x37));
  97.         }
  98.  
  99.         return ((u8)(hex_char - 0x57));
  100. }
  101.