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sources/3rdparty/getid3/extension.cache.mysql.php 6.11 KB
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  <?php
  /////////////////////////////////////////////////////////////////
  /// getID3() by James Heinrich <info@getid3.org>               //
  //  available at http://getid3.sourceforge.net                 //
  //            or http://www.getid3.org                         //
  /////////////////////////////////////////////////////////////////
  //                                                             //
  // extension.cache.mysql.php - part of getID3()                //
  // Please see readme.txt for more information                  //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  //                                                             //
  // This extension written by Allan Hansen <ahØartemis*dk>      //
  // Table name mod by Carlo Capocasa <calroØcarlocapocasa*com>  //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  
  /**
  * This is a caching extension for getID3(). It works the exact same
  * way as the getID3 class, but return cached information very fast
  *
  * Example:  (see also demo.cache.mysql.php in /demo/)
  *
  *    Normal getID3 usage (example):
  *
  *       require_once 'getid3/getid3.php';
  *       $getID3 = new getID3;
  *       $getID3->encoding = 'UTF-8';
  *       $info1 = $getID3->analyze('file1.flac');
  *       $info2 = $getID3->analyze('file2.wv');
  *
  *    getID3_cached usage:
  *
  *       require_once 'getid3/getid3.php';
  *       require_once 'getid3/getid3/extension.cache.mysql.php';
  *       // 5th parameter (tablename) is optional, default is 'getid3_cache'
  *       $getID3 = new getID3_cached_mysql('localhost', 'database', 'username', 'password', 'tablename');
  *       $getID3->encoding = 'UTF-8';
  *       $info1 = $getID3->analyze('file1.flac');
  *       $info2 = $getID3->analyze('file2.wv');
  *
  *
  * Supported Cache Types    (this extension)
  *
  *   SQL Databases:
  *
  *   cache_type          cache_options
  *   -------------------------------------------------------------------
  *   mysql               host, database, username, password
  *
  *
  *   DBM-Style Databases:    (use extension.cache.dbm)
  *
  *   cache_type          cache_options
  *   -------------------------------------------------------------------
  *   gdbm                dbm_filename, lock_filename
  *   ndbm                dbm_filename, lock_filename
  *   db2                 dbm_filename, lock_filename
  *   db3                 dbm_filename, lock_filename
  *   db4                 dbm_filename, lock_filename  (PHP5 required)
  *
  *   PHP must have write access to both dbm_filename and lock_filename.
  *
  *
  * Recommended Cache Types
  *
  *   Infrequent updates, many reads      any DBM
  *   Frequent updates                    mysql
  */
  
  
  class getID3_cached_mysql extends getID3
  {
  
  	// private vars
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  	private $cursor;
  	private $connection;
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  	// public: constructor - see top of this file for cache type and cache_options
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  	public function getID3_cached_mysql($host, $database, $username, $password, $table='getid3_cache') {
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  		// Check for mysql support
  		if (!function_exists('mysql_pconnect')) {
  			throw new Exception('PHP not compiled with mysql support.');
  		}
  
  		// Connect to database
  		$this->connection = mysql_pconnect($host, $username, $password);
  		if (!$this->connection) {
  			throw new Exception('mysql_pconnect() failed - check permissions and spelling.');
  		}
  
  		// Select database
  		if (!mysql_select_db($database, $this->connection)) {
  			throw new Exception('Cannot use database '.$database);
  		}
  
  		// Set table
  		$this->table = $table;
  
  		// Create cache table if not exists
  		$this->create_table();
  
  		// Check version number and clear cache if changed
  		$version = '';
  		if ($this->cursor = mysql_query("SELECT `value` FROM `".mysql_real_escape_string($this->table)."` WHERE (`filename` = '".mysql_real_escape_string(getID3::VERSION)."') AND (`filesize` = '-1') AND (`filetime` = '-1') AND (`analyzetime` = '-1')", $this->connection)) {
  			list($version) = mysql_fetch_array($this->cursor);
  		}
  		if ($version != getID3::VERSION) {
  			$this->clear_cache();
  		}
  
  		parent::getID3();
  	}
  
  
  
  	// public: clear cache
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  	public function clear_cache() {
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  		$this->cursor = mysql_query("DELETE FROM `".mysql_real_escape_string($this->table)."`", $this->connection);
  		$this->cursor = mysql_query("INSERT INTO `".mysql_real_escape_string($this->table)."` VALUES ('".getID3::VERSION."', -1, -1, -1, '".getID3::VERSION."')", $this->connection);
  	}
  
  
  
  	// public: analyze file
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  	public function analyze($filename) {
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  		if (file_exists($filename)) {
  
  			// Short-hands
  			$filetime = filemtime($filename);
  			$filesize = filesize($filename);
  
  			// Lookup file
  			$this->cursor = mysql_query("SELECT `value` FROM `".mysql_real_escape_string($this->table)."` WHERE (`filename` = '".mysql_real_escape_string($filename)."') AND (`filesize` = '".mysql_real_escape_string($filesize)."') AND (`filetime` = '".mysql_real_escape_string($filetime)."')", $this->connection);
  			if (mysql_num_rows($this->cursor) > 0) {
  				// Hit
  				list($result) = mysql_fetch_array($this->cursor);
  				return unserialize(base64_decode($result));
  			}
  		}
  
  		// Miss
  		$analysis = parent::analyze($filename);
  
  		// Save result
  		if (file_exists($filename)) {
  			$this->cursor = mysql_query("INSERT INTO `".mysql_real_escape_string($this->table)."` (`filename`, `filesize`, `filetime`, `analyzetime`, `value`) VALUES ('".mysql_real_escape_string($filename)."', '".mysql_real_escape_string($filesize)."', '".mysql_real_escape_string($filetime)."', '".mysql_real_escape_string(time())."', '".mysql_real_escape_string(base64_encode(serialize($analysis)))."')", $this->connection);
  		}
  		return $analysis;
  	}
  
  
  
  	// private: (re)create sql table
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  	private function create_table($drop=false) {
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  		$this->cursor = mysql_query("CREATE TABLE IF NOT EXISTS `".mysql_real_escape_string($this->table)."` (
  			`filename` VARCHAR(255) NOT NULL DEFAULT '',
  			`filesize` INT(11) NOT NULL DEFAULT '0',
  			`filetime` INT(11) NOT NULL DEFAULT '0',
  			`analyzetime` INT(11) NOT NULL DEFAULT '0',
  			`value` TEXT NOT NULL,
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  			PRIMARY KEY (`filename`,`filesize`,`filetime`)) ENGINE=MyISAM", $this->connection);
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  		echo mysql_error($this->connection);
  	}
  }