* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
}
}
- const char *DIGITS = "0123456789ABCDEF";
+ const char * const DIGITS = "0123456789ABCDEF";
for (unsigned j = 0; j < str_len; j++)
str[j] = DIGITS[(int)str[j]];
}
}
-int unhexify(char *bin, const char *hex, int count)
+/**
+ * Convert a string of hexadecimal pairs into its binary
+ * representation.
+ *
+ * @param[out] bin Buffer to store binary representation. The buffer size must
+ * be at least @p count.
+ * @param[in] hex String with hexadecimal pairs to convert into its binary
+ * representation.
+ * @param[in] count Number of hexadecimal pairs to convert.
+ *
+ * @return The number of converted hexadecimal pairs.
+ */
+size_t unhexify(uint8_t *bin, const char *hex, size_t count)
{
- int i, tmp;
+ size_t i;
+ char tmp;
- for (i = 0; i < count; i++) {
- if (sscanf(hex + (2 * i), "%02x", &tmp) != 1)
- return i;
- bin[i] = tmp;
+ if (!bin || !hex)
+ return 0;
+
+ memset(bin, 0, count);
+
+ for (i = 0; i < 2 * count; i++) {
+ if (hex[i] >= 'a' && hex[i] <= 'f')
+ tmp = hex[i] - 'a' + 10;
+ else if (hex[i] >= 'A' && hex[i] <= 'F')
+ tmp = hex[i] - 'A' + 10;
+ else if (hex[i] >= '0' && hex[i] <= '9')
+ tmp = hex[i] - '0';
+ else
+ return i / 2;
+
+ bin[i / 2] |= tmp << (4 * ((i + 1) % 2));
}
- return i;
+ return i / 2;
}
int hexify(char *hex, const char *bin, int count, int out_maxlen)