int
parse_hex_string(char *src, uint8_t *dst, uint32_t *size)
{
char *c;
uint32_t len, i;
/* Check input parameters */
if ((src == NULL) ||
(dst == NULL) ||
(size == NULL) ||
(*size == 0))
return -1;
len = strlen(src);
if (((len & 3) != 0) ||
(len > (*size) * 2))
return -1;
*size = len / 2;
for (c = src; *c != 0; c++) {
if ((((*c) >= '0') && ((*c) <= '9')) ||
(((*c) >= 'A') && ((*c) <= 'F')) ||
(((*c) >= 'a') && ((*c) <= 'f')))
continue;
return -1;
}
/* Convert chars to bytes */
for (i = 0; i < *size; i++)
dst[i] = get_hex_val(src[2 * i]) * 16 +
get_hex_val(src[2 * i + 1]);
return 0;
}
//returns the value of the first two digits
//of a hexadecimal string
unsigned char get_char_from_hex_str(char *string) {
unsigned char hex_num;
//error checking, even though it means we're redundantly
//calling get_hex_val
if (!is_hex_digit(string[0])) {
exit(-2);
}
if (!is_hex_digit(string[1])) {
exit(-2);
}
hex_num = 16 * get_hex_val(string[0]);
hex_num += get_hex_val(string[1]);
return hex_num;
}
