/******************************************************************************

 *

 * 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.h"

#include "accommon.h"

#define _COMPONENT          ACPI_COMPILER

        ACPI_MODULE_NAME    ("uthex")

/* Hex to ASCII conversion table */

static const char           AcpiGbl_HexToAscii[] =

{

    '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'

};

/*******************************************************************************

 *

 * FUNCTION:    AcpiUtHexToAsciiChar

 *

 * 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

AcpiUtHexToAsciiChar (

    UINT64                  Integer,

    UINT32                  Position)

{

    UINT64                  Index;

    AcpiUtShortShiftRight (Integer, Position, &Index);

    return (AcpiGbl_HexToAscii[Index & 0xF]);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiUtAsciiToHexByte

 *

 * PARAMETERS:  TwoAsciiChars               - Pointer to two ASCII characters

 *              ReturnByte                  - 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

AcpiUtAsciiToHexByte (

    char                    *TwoAsciiChars,

    UINT8                   *ReturnByte)

{

    /* Both ASCII characters must be valid hex digits */

    if (!isxdigit ((int) TwoAsciiChars[0]) ||

        !isxdigit ((int) TwoAsciiChars[1]))

    {

        return (AE_BAD_HEX_CONSTANT);

    }

    *ReturnByte =

        AcpiUtAsciiCharToHex (TwoAsciiChars[1]) |

        (AcpiUtAsciiCharToHex (TwoAsciiChars[0]) << 4);

    return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiUtAsciiCharToHex

 *

 * PARAMETERS:  HexChar                 - 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

 *

 ******************************************************************************/

UINT8

AcpiUtAsciiCharToHex (

    int                     HexChar)

{

    /* Values 0-9 */

    if (HexChar <= '9')

    {

        return ((UINT8) (HexChar - '0'));

    }

    /* Upper case A-F */

    if (HexChar <= 'F')

    {

        return ((UINT8) (HexChar - 0x37));

    }

    /* Lower case a-f */

    return ((UINT8) (HexChar - 0x57));

}