vendor/maxmind-db/reader/src/MaxMind/Db/Reader.php

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<?php

declare(strict_types=1);

namespace MaxMind\Db;

use ArgumentCountError;
use BadMethodCallException;
use Exception;
use InvalidArgumentException;
use MaxMind\Db\Reader\Decoder;
use MaxMind\Db\Reader\InvalidDatabaseException;
use MaxMind\Db\Reader\Metadata;
use MaxMind\Db\Reader\Util;
use UnexpectedValueException;

/**
 * Instances of this class provide a reader for the MaxMind DB format. IP
 * addresses can be looked up using the get method.
 */
class Reader
{
    /**
     * @var int
     */
    private static $DATA_SECTION_SEPARATOR_SIZE = 16;
    /**
     * @var string
     */
    private static $METADATA_START_MARKER = "\xAB\xCD\xEFMaxMind.com";
    /**
     * @var int
     */
    private static $METADATA_START_MARKER_LENGTH = 14;
    /**
     * @var int
     */
    private static $METADATA_MAX_SIZE = 131072; // 128 * 1024 = 128KiB

    /**
     * @var Decoder
     */
    private $decoder;
    /**
     * @var resource
     */
    private $fileHandle;
    /**
     * @var int
     */
    private $fileSize;
    /**
     * @var int
     */
    private $ipV4Start;
    /**
     * @var Metadata
     */
    private $metadata;