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<?php |
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declare(strict_types=1); |
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namespace Ivory\Value; |
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use Ivory\Exception\ParseException; |
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/** |
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* Representation of an 8-byte MAC address. |
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* |
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* The objects are immutable. |
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*/ |
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class MacAddr8 |
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{ |
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private $canonAddr; |
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/** |
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* Creates an 8-byte MAC address from its string representation. |
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* |
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* The same input formats as by PostgreSQL are accepted. Consistently with PostgreSQL, both 6 and 8 byte MAC |
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* addresses are accepted, 6 bytes converted to 8 bytes by 4th and 5th bytes set to FF and FE, respectively. |
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* |
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* Any input which is comprised of pairs of hex digits (on byte boundaries), optionally separated consistently by |
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* one of `':'`, `'-'` or `'.'`, is accepted. The number of hex digits must be either 16 (8 bytes) or 12 (6 bytes). |
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* Leading and trailing whitespace is ignored. The following are examples of input formats that are accepted: |
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* `'XX:XX:XX:XX:XX:XX:XX:XX'` |
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* `'XX-XX-XX-XX-XX-XX-XX-XX'` |
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* `'XXXXXX:XXXXXXXXXX'` |
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* `'XXXXXX-XXXXXXXXXX'` |
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* `'XXXX.XXXX.XXXX.XXXX'` |
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* `'XXXX-XXXX-XXXX-XXXX'` |
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* `'XXXXXXXX:XXXXXXXX'` |
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* `'XXXXXXXXXXXXXXXX'` |
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* |
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* @param string $addr the string representation of the 8-byte MAC address in one of the formats mentioned above; |
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* other formats are rejected by a {@link ParseException} |
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* @return MacAddr8 |
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*/ |
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public static function fromString(string $addr): MacAddr8 |
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{ |
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$canon = ''; |
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$len = strlen($addr); |
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$sep = null; |
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$digits = 0; |
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for ($i = 0; $i < $len; $i++) { |
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$c = $addr[$i]; |
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if (ctype_xdigit($c)) { |
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if (($digits % 2) == 0 && $digits > 0) { |
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$canon .= ':'; |
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} |
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$canon .= $c; |
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$digits++; |
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} elseif ($sep === null && ($c == ':' || $c == '-' || $c == '.')) { |
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$sep = $c; |
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} elseif ($c !== $sep && !ctype_space($c)) { |
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throw new ParseException('Invalid macaddr8 string', $i); |
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} |
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} |
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if ($digits == 12) { |
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$canon = substr($canon, 0, 8) . ':ff:fe' . substr($canon, 8); |
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} elseif ($digits != 16) { |
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throw new ParseException('Invalid macaddr8 string: only 6 or 8 bytes may be provided'); |
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} |
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return new MacAddr8(strtolower($canon)); |
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} |
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/** |
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* Creates an 8-byte MAC address from a 6-byte MAC address using the standard conversion. |
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* |
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* 8 bytes are made from 6 bytes in such a way that bytes `FFFE` are inserted in the middle of the 6 bytes. |
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* |
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* @see from6ByteMacAddrForIp6() for a modified conversion used by IPv6 |
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* @param MacAddr $macAddr |
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* @return MacAddr8 |
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*/ |
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public static function from6ByteMacAddr(MacAddr $macAddr): MacAddr8 |
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{ |
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$inStr = $macAddr->toString(); |
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$canon = substr($inStr, 0, 8) . ':ff:fe' . substr($inStr, 8); |
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return new MacAddr8($canon); |
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} |
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/** |
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* Creates an 8-byte MAC address from a 6-byte MAC address using the IPv6 conversion. |
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* |
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* 8 bytes are made from 6 bytes in such a way that `FFFE` are inserted in the middle of the 6 bytes, and the 7th |
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* bit is set. This is the conversion used by IPv6. |
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* |
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* @see from6ByteMacAddr() for the standard conversion, i.e., without setting the 7th bit |
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* @param MacAddr $macAddr |
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* @return MacAddr8 |
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*/ |
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public static function from6ByteMacAddrForIp6(MacAddr $macAddr): MacAddr8 |
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{ |
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$inStr = $macAddr->toString(); |
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$scanned = sscanf(substr($inStr, 0, 2), '%x', $firstByte); |
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assert($scanned == 1); |
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$firstByte |= 0b000000010; |
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$canon = sprintf('%02x', $firstByte) . substr($inStr, 2, 6) . ':ff:fe' . substr($inStr, 8); |
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return new MacAddr8($canon); |
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} |
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private function __construct(string $canonAddr) |
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{ |
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$this->canonAddr = $canonAddr; |
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} |
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/** |
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* @return string the conventional canonical form of the 8-byte MAC address, i.e., in the |
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* <tt>'XX:XX:XX:XX:XX:XX:XX:XX'</tt> format, all the digits in lowercase |
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*/ |
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final public function toString(): string |
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{ |
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return $this->canonAddr; |
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} |
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public function __toString() |
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{ |
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return $this->toString(); |
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} |
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} |
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ondrej-bouda /
ivory
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