+ /**
+ * Convert an IPv4 or IPv6 hexadecimal representation back to readable format
+ */
+ public static function formatHex( $hex ) {
+ if ( substr( $hex, 0, 3 ) == 'v6-' ) {
+ return self::hexToOctet( $hex );
+ } else {
+ return self::hexToQuad( $hex );
+ }
+ }
+
+ /**
+ * Given a hexadecimal number, returns to an IPv6 address in octet notation
+ * @param $ip string hex IP
+ * @return string
+ */
+ public static function hextoOctet( $ip_hex ) {
+ // Convert to padded uppercase hex
+ $ip_hex = str_pad( strtoupper($ip_hex), 32, '0');
+ // Separate into 8 octets
+ $ip_oct = substr( $ip_hex, 0, 4 );
+ for ($n=1; $n < 8; $n++) {
+ $ip_oct .= ':' . substr($ip_hex, 4*$n, 4);
+ }
+ // NO leading zeroes
+ $ip_oct = preg_replace( '/(^|:)0+' . RE_IPV6_WORD . '/', '$1$2', $ip_oct );
+ return $ip_oct;
+ }
+
+ /**
+ * Converts a hexadecimal number to an IPv4 address in octet notation
+ * @param $ip string Hex IP
+ * @return string
+ */
+ public static function hexToQuad( $ip ) {
+ // Converts a hexadecimal IP to nnn.nnn.nnn.nnn format
+ $s = '';
+ for ( $i = 0; $i < 4; $i++ ) {
+ if ( $s !== '' ) {
+ $s .= '.';
+ }
+ $s .= base_convert( substr( $ip, $i * 2, 2 ), 16, 10 );
+ }
+ return $s;
+ }
+