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<?php

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namespace Wordfence\MmdbReader;

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use Wordfence\MmdbReader\Exception\FormatException;

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class DatabaseMetadata {

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const MAX_LENGTH = 131072; //128 * 1024;

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const FIELD_MAJOR_VERSION = 'binary_format_major_version';

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const FIELD_NODE_COUNT = 'node_count';

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const FIELD_RECORD_SIZE = 'record_size';

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const FIELD_IP_VERSION = 'ip_version';

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const FIELD_BUILD_EPOCH = 'build_epoch';

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private $data;

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public function __construct($data) {

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$this->data = $data;

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}

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private function getField($key, $default = null, &$exists = null) {

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if (!array_key_exists($key, $this->data)) {

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$exists = false;

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return $default;

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}

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$exists = true;

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return $this->data[$key];

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}

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private function requireField($key) {

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$value = $this->getField($key, null, $exists);

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if (!$exists)

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throw new FormatException("Metadata field {$key} is missing");

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return $value;

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}

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public function requireInteger($key) {

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$value = $this->requireField($key);

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if (!is_int($value))

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throw new FormatException("Field {$key} should be an integer, received: " . print_r($value, true));

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return $value;

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}

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public function getMajorVersion() {

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return $this->requireInteger(self::FIELD_MAJOR_VERSION);

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}

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public function getNodeCount() {

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return $this->requireInteger(self::FIELD_NODE_COUNT);

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}

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public function getRecordSize() {

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return $this->requireInteger(self::FIELD_RECORD_SIZE);

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}

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public function getIpVersion() {

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return $this->requireInteger(self::FIELD_IP_VERSION);

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}

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public function getBuildEpoch() {

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return $this->requireInteger(self::FIELD_BUILD_EPOCH);

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}

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public static function parse($handle) {

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$offset = $handle->getPosition();

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$parser = new DataFieldParser($handle, $offset);

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$value = $parser->parseField();

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if (!is_array($value))

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throw new FormatException('Unexpected field type found when metadata map was expected: ' . print_r($value, true));

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return new self($value);

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}

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}

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