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https://gitee.com/zoujingli/ThinkAdmin.git
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343 lines
11 KiB
PHP
343 lines
11 KiB
PHP
<?php
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/**
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* ip2region php seacher client class
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*
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* @author chenxin<chenxin619315@gmail.com>
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* @date 2015-10-29
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*/
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defined('INDEX_BLOCK_LENGTH') or define('INDEX_BLOCK_LENGTH', 12);
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defined('TOTAL_HEADER_LENGTH') or define('TOTAL_HEADER_LENGTH', 8192);
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class Ip2Region
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{
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/**
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* db file handler
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*/
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private $dbFileHandler = null;
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/**
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* header block info
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*/
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private $HeaderSip = null;
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private $HeaderPtr = null;
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private $headerLen = 0;
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/**
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* super block index info
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*/
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private $firstIndexPtr = 0;
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private $lastIndexPtr = 0;
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private $totalBlocks = 0;
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/**
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* for memory mode only
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* the original db binary string
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*/
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private $dbBinStr = null;
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private $dbFile = null;
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/**
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* construct method
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*
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* @param string ip2regionFile
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*/
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public function __construct($ip2regionFile = null)
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{
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$this->dbFile = is_null($ip2regionFile) ? __DIR__ . '/ip2region.db' : $ip2regionFile;
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}
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/**
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* all the db binary string will be loaded into memory
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* then search the memory only and this will a lot faster than disk base search
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* @Note:
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* invoke it once before put it to public invoke could make it thread safe
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*
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* @param string $ip
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* @return array|null
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* @throws Exception
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*/
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public function memorySearch($ip)
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{
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//check and load the binary string for the first time
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if ($this->dbBinStr == null) {
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$this->dbBinStr = file_get_contents($this->dbFile);
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if ($this->dbBinStr == false) {
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throw new Exception("Fail to open the db file {$this->dbFile}");
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}
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$this->firstIndexPtr = self::getLong($this->dbBinStr, 0);
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$this->lastIndexPtr = self::getLong($this->dbBinStr, 4);
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$this->totalBlocks = ($this->lastIndexPtr - $this->firstIndexPtr) / INDEX_BLOCK_LENGTH + 1;
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}
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if (is_string($ip)) $ip = self::safeIp2long($ip);
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//binary search to define the data
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$l = 0;
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$h = $this->totalBlocks;
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$dataPtr = 0;
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while ($l <= $h) {
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$m = (($l + $h) >> 1);
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$p = $this->firstIndexPtr + $m * INDEX_BLOCK_LENGTH;
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$sip = self::getLong($this->dbBinStr, $p);
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if ($ip < $sip) {
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$h = $m - 1;
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} else {
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$eip = self::getLong($this->dbBinStr, $p + 4);
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if ($ip > $eip) {
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$l = $m + 1;
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} else {
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$dataPtr = self::getLong($this->dbBinStr, $p + 8);
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break;
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}
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}
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}
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//not matched just stop it here
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if ($dataPtr == 0) return null;
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//get the data
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$dataLen = (($dataPtr >> 24) & 0xFF);
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$dataPtr = ($dataPtr & 0x00FFFFFF);
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return array(
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'city_id' => self::getLong($this->dbBinStr, $dataPtr),
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'region' => substr($this->dbBinStr, $dataPtr + 4, $dataLen - 4),
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);
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}
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/**
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* get the data block through the specified ip address or long ip numeric with binary search algorithm
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*
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* @param string ip
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* @return mixed Array or NULL for any error
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* @throws Exception
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*/
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public function binarySearch($ip)
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{
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//check and conver the ip address
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if (is_string($ip)) $ip = self::safeIp2long($ip);
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if ($this->totalBlocks == 0) {
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//check and open the original db file
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if ($this->dbFileHandler == null) {
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$this->dbFileHandler = fopen($this->dbFile, 'r');
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if ($this->dbFileHandler == false) {
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throw new Exception("Fail to open the db file {$this->dbFile}");
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}
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}
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fseek($this->dbFileHandler, 0);
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$superBlock = fread($this->dbFileHandler, 8);
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$this->firstIndexPtr = self::getLong($superBlock, 0);
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$this->lastIndexPtr = self::getLong($superBlock, 4);
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$this->totalBlocks = ($this->lastIndexPtr - $this->firstIndexPtr) / INDEX_BLOCK_LENGTH + 1;
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}
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//binary search to define the data
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$l = 0;
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$h = $this->totalBlocks;
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$dataPtr = 0;
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while ($l <= $h) {
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$m = (($l + $h) >> 1);
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$p = $m * INDEX_BLOCK_LENGTH;
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fseek($this->dbFileHandler, $this->firstIndexPtr + $p);
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$buffer = fread($this->dbFileHandler, INDEX_BLOCK_LENGTH);
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$sip = self::getLong($buffer, 0);
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if ($ip < $sip) {
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$h = $m - 1;
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} else {
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$eip = self::getLong($buffer, 4);
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if ($ip > $eip) {
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$l = $m + 1;
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} else {
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$dataPtr = self::getLong($buffer, 8);
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break;
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}
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}
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}
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//not matched just stop it here
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if ($dataPtr == 0) return null;
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//get the data
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$dataLen = (($dataPtr >> 24) & 0xFF);
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$dataPtr = ($dataPtr & 0x00FFFFFF);
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fseek($this->dbFileHandler, $dataPtr);
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$data = fread($this->dbFileHandler, $dataLen);
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return array(
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'city_id' => self::getLong($data, 0),
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'region' => substr($data, 4),
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);
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}
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/**
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* get the data block associated with the specified ip with b-tree search algorithm
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* @Note: not thread safe
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*
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* @param string ip
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* @return Mixed Array for NULL for any error
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* @throws Exception
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*/
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public function btreeSearch($ip)
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{
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if (is_string($ip)) $ip = self::safeIp2long($ip);
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//check and load the header
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if ($this->HeaderSip == null) {
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//check and open the original db file
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if ($this->dbFileHandler == null) {
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$this->dbFileHandler = fopen($this->dbFile, 'r');
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if ($this->dbFileHandler == false) {
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throw new Exception("Fail to open the db file {$this->dbFile}");
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}
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}
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fseek($this->dbFileHandler, 8);
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$buffer = fread($this->dbFileHandler, TOTAL_HEADER_LENGTH);
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//fill the header
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$idx = 0;
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$this->HeaderSip = array();
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$this->HeaderPtr = array();
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for ($i = 0; $i < TOTAL_HEADER_LENGTH; $i += 8) {
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$startIp = self::getLong($buffer, $i);
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$dataPtr = self::getLong($buffer, $i + 4);
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if ($dataPtr == 0) break;
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$this->HeaderSip[] = $startIp;
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$this->HeaderPtr[] = $dataPtr;
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$idx++;
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}
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$this->headerLen = $idx;
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}
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//1. define the index block with the binary search
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$l = 0;
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$h = $this->headerLen;
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$sptr = 0;
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$eptr = 0;
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while ($l <= $h) {
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$m = (($l + $h) >> 1);
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//perfetc matched, just return it
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if ($ip == $this->HeaderSip[$m]) {
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if ($m > 0) {
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$sptr = $this->HeaderPtr[$m - 1];
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$eptr = $this->HeaderPtr[$m];
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} else {
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$sptr = $this->HeaderPtr[$m];
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$eptr = $this->HeaderPtr[$m + 1];
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}
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break;
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}
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//less then the middle value
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if ($ip < $this->HeaderSip[$m]) {
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if ($m == 0) {
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$sptr = $this->HeaderPtr[$m];
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$eptr = $this->HeaderPtr[$m + 1];
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break;
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} elseif ($ip > $this->HeaderSip[$m - 1]) {
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$sptr = $this->HeaderPtr[$m - 1];
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$eptr = $this->HeaderPtr[$m];
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break;
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}
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$h = $m - 1;
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} else {
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if ($m == $this->headerLen - 1) {
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$sptr = $this->HeaderPtr[$m - 1];
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$eptr = $this->HeaderPtr[$m];
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break;
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} elseif ($ip <= $this->HeaderSip[$m + 1]) {
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$sptr = $this->HeaderPtr[$m];
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$eptr = $this->HeaderPtr[$m + 1];
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break;
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}
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$l = $m + 1;
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}
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}
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//match nothing just stop it
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if ($sptr == 0) return null;
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//2. search the index blocks to define the data
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$blockLen = $eptr - $sptr;
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fseek($this->dbFileHandler, $sptr);
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$index = fread($this->dbFileHandler, $blockLen + INDEX_BLOCK_LENGTH);
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$dataPtr = 0;
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$l = 0;
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$h = $blockLen / INDEX_BLOCK_LENGTH;
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while ($l <= $h) {
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$m = (($l + $h) >> 1);
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$p = (int)($m * INDEX_BLOCK_LENGTH);
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$sip = self::getLong($index, $p);
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if ($ip < $sip) {
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$h = $m - 1;
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} else {
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$eip = self::getLong($index, $p + 4);
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if ($ip > $eip) {
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$l = $m + 1;
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} else {
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$dataPtr = self::getLong($index, $p + 8);
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break;
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}
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}
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}
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//not matched
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if ($dataPtr == 0) return null;
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//3. get the data
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$dataLen = (($dataPtr >> 24) & 0xFF);
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$dataPtr = ($dataPtr & 0x00FFFFFF);
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fseek($this->dbFileHandler, $dataPtr);
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$data = fread($this->dbFileHandler, $dataLen);
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return array(
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'city_id' => self::getLong($data, 0),
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'region' => substr($data, 4),
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);
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}
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/**
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* safe self::safeIp2long function
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*
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* @param string ip
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*
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* @return false|int|string
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*/
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public static function safeIp2long($ip)
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{
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$ip = ip2long($ip);
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// convert signed int to unsigned int if on 32 bit operating system
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if ($ip < 0 && PHP_INT_SIZE == 4) {
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$ip = sprintf("%u", $ip);
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}
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return $ip;
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}
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/**
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* read a long from a byte buffer
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*
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* @param string b
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* @param integer offset
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* @return int|string
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*/
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public static function getLong($b, $offset)
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{
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$val = (
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(ord($b[$offset++])) |
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(ord($b[$offset++]) << 8) |
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(ord($b[$offset++]) << 16) |
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(ord($b[$offset]) << 24)
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);
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// convert signed int to unsigned int if on 32 bit operating system
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if ($val < 0 && PHP_INT_SIZE == 4) {
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$val = sprintf("%u", $val);
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}
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return $val;
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}
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/**
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* destruct method, resource destroy
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*/
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public function __destruct()
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{
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if ($this->dbFileHandler != null) {
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fclose($this->dbFileHandler);
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}
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$this->dbBinStr = null;
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$this->HeaderSip = null;
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$this->HeaderPtr = null;
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}
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} |