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//==========================================================================

//

//      hex-utils.c

//

//      Utilities for dealing with hexadecimal strings.

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    

// Contributors: gthomas

// Date:         1999-10-20

// Purpose:      

// Description:  

//               

//

//####DESCRIPTIONEND####

//

//=========================================================================

#include <bsp/hex-utils.h>

int

__hex(char ch)

{

    if ((ch >= 'a') && (ch <= 'f')) return (ch-'a'+10);

    if ((ch >= '0') && (ch <= '9')) return (ch-'0');

    if ((ch >= 'A') && (ch <= 'F')) return (ch-'A'+10);

    return (-1);

}

/*

 * Convert the hex data in 'buf' into 'count' bytes to be placed in 'mem'.

 * Returns a pointer to the character in mem AFTER the last byte written.

 */

char *

__unpack_bytes_to_mem(char *buf, char *mem, int count)

{

    int  i;

    char ch;

    for (i = 0; i < count; i++) {

        ch = __hex(*buf++) << 4;

        ch = ch + __hex(*buf++);

        *mem++ = ch;

    }

    return(mem);

}

/*

 * While finding valid hex chars, build an unsigned long int.

 * Return number of hex chars processed.

 */

int

__unpack_ulong(char **ptr, unsigned long *val)

{

    int numChars = 0;

    int hexValue;

    *val = 0;

    while (**ptr) {

        hexValue = __hex(**ptr);

        if (hexValue >= 0) {

            *val = (*val << 4) | hexValue;

            numChars ++;

        } else

            break;

        (*ptr)++;

    }

    return (numChars);

}

/*

 * Unpack 'count' hex characters, forming them into a binary value.

 * Return that value as an int. Adjust the source pointer accordingly.

 */

int

__unpack_nibbles(char **ptr, int count)

{

    int value = 0;

    while (--count >= 0) {

        value = (value << 4) | __hex(**ptr);

        (*ptr)++;

    }

    return value;

}