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<?php /** * Class wfBinaryList implements an interface to interact with binary lists. These are internally a sorted list of * values of a specific size. The sorted aspect allows for very quick searching. */ class wfBinaryList { private $size = 0; private $list = ''; public function __construct($binary) { $this->size = ord(wfWAFUtils::substr($binary, 0, 1)); $this->list = wfWAFUtils::substr($binary, 1); } public function contains($value) { if ($this->size == 0) { return false; } $length = wfWAFUtils::strlen($this->list); if ($length == 0) { return false; } $p = wfWAFUtils::substr($value, 0, $this->size); $count = ceil($length / $this->size); $low = 0; $high = $count - 1; while ($low <= $high) { $mid = (int) (($high + $low) / 2); $val = wfWAFUtils::substr($this->list, $mid * $this->size, $this->size); $cmp = strcmp($val, $p); if ($cmp < 0) { $low = $mid + 1; } else if ($cmp > 0) { $high = $mid - 1; } else { return $mid; } } return false; } }
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