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96 lines
2.7 KiB
96 lines
2.7 KiB
<?php
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// 数据来源：IPIP免费数据库 ipipfree.ipdb
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// 初始化类：new IPDB($fileName)
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// 请求方式：getDistrict($ip)
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// 返回格式：
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// {
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// '0': 国家
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// '1': 省、直辖市
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// '2': 市
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// }
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// 注：仅国内省市数据
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//
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// 请求版本：getVersion()
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// 返回格式：YYYYMMDD
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class IPDB {
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private $fp; // 文件指针
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private $meta; // 元数据信息
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private $nodeCount;
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private $nodeOffset;
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public function __construct($fileName) { // 构造函数
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$this->fp = fopen($fileName, 'rb');
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$metaSize = unpack('N', fread($this->fp, 4))[1]; // 获取元数据长度
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$this->meta = json_decode(fread($this->fp, $metaSize), 1); // 读取元数据信息
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$this->nodeCount = $this->meta['node_count'];
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$this->nodeOffset = 4 + $metaSize;
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}
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public function __destruct() { // 析构函数
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if ($this->fp) {
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fclose($this->fp);
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}
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}
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public function getVersion() { // 获取版本信息
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return date("Ymd", $this->meta['build']);
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}
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public function getDistrict($ip) { // 获取地区信息
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$node = $this->getNode($ip);
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if ($node <= 0) {
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return NULL;
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}
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return explode("\t", $this->getData($node));
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}
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private function getNode($ip) { // 获取节点编号
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$node = 0;
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$binary = inet_pton($ip);
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for ($i = 0; $i < 96 && $node < $this->nodeCount; $i++) {
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if ($i >= 80) {
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$node = $this->readNode($node, 1);
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} else {
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$node = $this->readNode($node, 0);
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}
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if ($node > $this->nodeCount) {
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return 0;
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}
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}
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for ($i = 0; $i < 32; $i++) {
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if ($node >= $this->nodeCount) {
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break;
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}
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$node = $this->readNode($node, 1 & ((0xFF & ord($binary[$i >> 3])) >> 7 - ($i % 8)));
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}
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if ($node <= $this->nodeCount) {
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return NULL;
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}
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return $node;
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}
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private function readNode($node, $index) {
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return unpack('N', $this->read($node * 8 + $index * 4, 4))[1];
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}
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private function getData($node) { // 根据节点编号获取信息
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$offset = $node + $this->nodeCount * 7;
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$bytes = $this->read($offset, 2);
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$size = unpack('N', str_pad($bytes, 4, "\x00", STR_PAD_LEFT))[1];
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$offset += 2;
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return $this->read($offset, $size);
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}
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private function read($offset, $length) { // 从指定位置读取指定长度
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if ($length <= 0) {
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return NULL;
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}
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if (fseek($this->fp, $offset + $this->nodeOffset) === 0) {
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return fread($this->fp, $length);
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}
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}
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}
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?>
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