sys/contrib/dev/acpica/source/components/utilities/uthex.c

   1 /******************************************************************************
   2  *
   3  * Module Name: uthex -- Hex/ASCII support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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.h"
  45 #include "accommon.h"
  46
  47 #define _COMPONENT          ACPI_COMPILER
  48         ACPI_MODULE_NAME    ("uthex")
  49
  50
  51 /* Hex to ASCII conversion table */
  52
  53 static const char           AcpiGbl_HexToAscii[] =
  54 {
  55     '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
  56 };
  57
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    AcpiUtHexToAsciiChar
  62  *
  63  * PARAMETERS:  Integer             - Contains the hex digit
  64  *              Position            - bit position of the digit within the
  65  *                                    integer (multiple of 4)
  66  *
  67  * RETURN:      The converted Ascii character
  68  *
  69  * DESCRIPTION: Convert a hex digit to an Ascii character
  70  *
  71  ******************************************************************************/
  72
  73 char
  74 AcpiUtHexToAsciiChar (
  75     UINT64                  Integer,
  76     UINT32                  Position)
  77 {
  78
  79     return (AcpiGbl_HexToAscii[(Integer >> Position) & 0xF]);
  80 }
  81
  82
  83 /*******************************************************************************
  84  *
  85  * FUNCTION:    AcpiUtAsciiToHexByte
  86  *
  87  * PARAMETERS:  TwoAsciiChars               - Pointer to two ASCII characters
  88  *              ReturnByte                  - Where converted byte is returned
  89  *
  90  * RETURN:      Status and converted hex byte
  91  *
  92  * DESCRIPTION: Perform ascii-to-hex translation, exactly two ASCII characters
  93  *              to a single converted byte value.
  94  *
  95  ******************************************************************************/
  96
  97 ACPI_STATUS
  98 AcpiUtAsciiToHexByte (
  99     char                    *TwoAsciiChars,
 100     UINT8                   *ReturnByte)
 101 {
 102
 103     /* Both ASCII characters must be valid hex digits */
 104
 105     if (!isxdigit ((int) TwoAsciiChars[0]) ||
 106         !isxdigit ((int) TwoAsciiChars[1]))
 107     {
 108         return (AE_BAD_HEX_CONSTANT);
 109     }
 110
 111     *ReturnByte =
 112         AcpiUtAsciiCharToHex (TwoAsciiChars[1]) |
 113         (AcpiUtAsciiCharToHex (TwoAsciiChars[0]) << 4);
 114
 115     return (AE_OK);
 116 }
 117
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    AcpiUtAsciiCharToHex
 122  *
 123  * PARAMETERS:  HexChar                 - Hex character in Ascii. Must be:
 124  *                                        0-9 or A-F or a-f
 125  *
 126  * RETURN:      The binary value of the ascii/hex character
 127  *
 128  * DESCRIPTION: Perform ascii-to-hex translation
 129  *
 130  ******************************************************************************/
 131
 132 UINT8
 133 AcpiUtAsciiCharToHex (
 134     int                     HexChar)
 135 {
 136
 137     /* Values 0-9 */
 138
 139     if (HexChar <= '9')
 140     {
 141         return ((UINT8) (HexChar - '0'));
 142     }
 143
 144     /* Upper case A-F */
 145
 146     if (HexChar <= 'F')
 147     {
 148         return ((UINT8) (HexChar - 0x37));
 149     }
 150
 151     /* Lower case a-f */
 152
 153     return ((UINT8) (HexChar - 0x57));
 154 }