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<?php |
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namespace JAAulde\IP\V4; |
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/** |
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* Represents an IP(V4) subnet mask. |
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* |
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* @author Jim Auldridge <[email protected]> |
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* @copyright 2006-2015 Jim Auldridge |
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* @license MIT |
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*/ |
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class SubnetMask extends Address |
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{ |
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/** |
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* Retrieve the number of host bits denoted by this mask. |
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* |
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* @return int |
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*/ |
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public function getHostBitsCount() |
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{ |
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return 32 - $this->getNetworkBitsCount(); |
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} |
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/** |
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* Retrieve the number of network bits denoted by this mask. |
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* |
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* @return int |
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*/ |
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public function getNetworkBitsCount() |
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{ |
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return (int) (32 - log(($this->get() ^ ip2long('255.255.255.255')) + 1, 2)); |
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} |
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/** |
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* Alias to \JAAulde\IP\V4\SubnetMask::getNetworkBitsCount. |
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* |
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* @uses \JAAulde\IP\V4\SubnetMask::getNetworkBitsCount |
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* |
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* @return int |
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*/ |
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public function getCIDRPrefix() |
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{ |
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return $this->getNetworkBitsCount(); |
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} |
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/** |
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* Given two (2) IP (V4) addresses, calculate a CIDR prefix for the network which could contain them both. |
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* |
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* @param \JAAulde\IP\V4\Address $address1 |
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* @param \JAAulde\IP\V4\Address $address2 |
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*/ |
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public static function calculateCIDRToFit(Address $address1, Address $address2) |
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{ |
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return (int) floor(32 - log(($address1->get() ^ $address2->get()) + 1, 2)); |
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} |
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/** |
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* Factory method for producing a SubnetMask instance from a CIDR (slash notation) prefix size. |
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* |
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* @param int $prefixSize Number of network bits to be represented by the subnet mask |
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* |
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* @return self |
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* |
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* @throws Exception |
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*/ |
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public static function fromCIDRPrefix($prefixSize) |
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{ |
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if (!is_int($prefixSize)) { |
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throw new \Exception(__METHOD__.' requires first param, $prefixSize, to be an integer'); |
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} |
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if ($prefixSize < 1 || $prefixSize > 31) { |
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throw new \Exception(__METHOD__.' requires first param, $prefixSize, to be CIDR prefix size with value between 1 and 31 (inclusive)'); |
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} |
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return new self(bindec(str_repeat('1', $prefixSize).str_repeat('0', 32 - $prefixSize))); |
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} |
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} |
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JAAulde /
php-ipv4
