linux-imx

/*

 * lib/hexdump.c

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation. See README and COPYING for

 * more details.

 */

​

#include <linux/types.h>

#include <linux/ctype.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/export.h>

#include <asm/unaligned.h>

​

const char hex_asc[] = "0123456789abcdef";

EXPORT_SYMBOL(hex_asc);

const char hex_asc_upper[] = "0123456789ABCDEF";

EXPORT_SYMBOL(hex_asc_upper);

​

/**

 * hex_to_bin - convert a hex digit to its real value

 * @ch: ascii character represents hex digit

 *

 * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad

 * input.

 */

int hex_to_bin(char ch)

{

    if ((ch >= '0') && (ch <= '9'))

        return ch - '0';

    ch = tolower(ch);

    if ((ch >= 'a') && (ch <= 'f'))

        return ch - 'a' + 10;

    return -1;

}

EXPORT_SYMBOL(hex_to_bin);

​

/**

 * hex2bin - convert an ascii hexadecimal string to its binary representation

 * @dst: binary result

 * @src: ascii hexadecimal string

 * @count: result length

 *

 * Return 0 on success, -EINVAL in case of bad input.

 */

int hex2bin(u8 *dst, const char *src, size_t count)

{

    while (count--) {

        int hi = hex_to_bin(*src++);

        int lo = hex_to_bin(*src++);

​

        if ((hi < 0) || (lo < 0))

            return -EINVAL;

​

        *dst++ = (hi << 4) | lo;

    }

    return 0;

}

EXPORT_SYMBOL(hex2bin);

​

/**