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Description

Usage

Reader::findAddressInTree( $ipAddress );

Parameters

$ipAddress

( mixed ) required –

Returns

void

Source

File name: woocommerce/vendor/maxmind-db/reader/src/MaxMind/Db/Reader.php
Lines:

    private function findAddressInTree($ipAddress)
    {
        $rawAddress = unpack('C*', inet_pton($ipAddress));

        $bitCount = \count($rawAddress) * 8;

        // The first node of the tree is always node 0, at the beginning of the
        // value
        $node = 0;

        $metadata = $this->metadata;

        // Check if we are looking up an IPv4 address in an IPv6 tree. If this
        // is the case, we can skip over the first 96 nodes.
        if ($metadata->ipVersion === 6) {
            if ($bitCount === 32) {
                $node = $this->ipV4Start;
            }
        } elseif ($metadata->ipVersion === 4 && $bitCount === 128) {
            throw new InvalidArgumentException(
                "Error looking up $ipAddress. You attempted to look up an"
                . ' IPv6 address in an IPv4-only database.'
            );
        }

        $nodeCount = $metadata->nodeCount;

        for ($i = 0; $i < $bitCount && $node < $nodeCount; ++$i) {
            $tempBit = 0xFF & $rawAddress[($i >> 3) + 1];
            $bit = 1 & ($tempBit >> 7 - ($i % 8));

            $node = $this->readNode($node, $bit);
        }
        if ($node === $nodeCount) {
            // Record is empty
            return [0, $i];
        } elseif ($node > $nodeCount) {
            // Record is a data pointer
            return [$node, $i];
        }
        throw new InvalidDatabaseException('Something bad happened');
    }
 

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