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<?php
/////////////////////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>                               //
//  available at http://getid3.sourceforge.net                                 //
//            or http://www.getid3.org                                         //
//          also https://github.com/JamesHeinrich/getID3                       //
/////////////////////////////////////////////////////////////////////////////////
///                                                                            //
// extension.cache.sqlite3.php - part of getID3()                              //
// Please see readme.txt for more information                                  //
//                                                                            ///
/////////////////////////////////////////////////////////////////////////////////
///                                                                            //
// MySQL extension written by Allan Hansen <ahØartemis*dk>                     //
// Table name mod by Carlo Capocasa <calroØcarlocapocasa*com>                  //
// MySQL extension was reworked for SQLite3 by Karl G. Holz <newaeonØmac*com>  //
//                                                                            ///
/////////////////////////////////////////////////////////////////////////////////
/**
* This is a caching extension for getID3(). It works the exact same
* way as the getID3 class, but return cached information much faster
*
*    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/extension.cache.sqlite3.php';
*       // all parameters are optional, defaults are:
*       $getID3 = new getID3_cached_sqlite3($table='getid3_cache', $hide=FALSE);
*       $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
*
*   sqlite3             table='getid3_cache', hide=false        (PHP5)
*
*
* ***  database file will be stored in the same directory as this script,
* ***  webserver must have write access to that directory!
* ***  set $hide to TRUE to prefix db file with .ht to pervent access from web client
* ***  this is a default setting in the Apache configuration:
*
* The following lines prevent .htaccess and .htpasswd files from being viewed by Web clients.
*
* <Files ~ "^\.ht">
*     Order allow,deny
*     Deny from all
*     Satisfy all
* </Files>
*
********************************************************************************
*
*   -------------------------------------------------------------------
*   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
********************************************************************************
*
* IMHO this is still a bit slow, I'm using this with MP4/MOV/ M4v files
* there is a plan to add directory scanning and analyzing to make things work much faster
*
*
*/
class getID3_cached_sqlite3 extends getID3 {

	/**
	* __construct()
	* @param string $table holds name of sqlite table
	* @return type
	*/
	public function __construct($table='getid3_cache', $hide=false) {
		$this->table = $table; // Set table
		$file = dirname(__FILE__).'/'.basename(__FILE__, 'php').'sqlite';
		if ($hide) {
			$file = dirname(__FILE__).'/.ht.'.basename(__FILE__, 'php').'sqlite';
		}
		$this->db = new SQLite3($file);
		$db = $this->db;
		$this->create_table();   // Create cache table if not exists
		$version = '';
		$sql = $this->version_check;
		$stmt = $db->prepare($sql);
		$stmt->bindValue(':filename', getID3::VERSION, SQLITE3_TEXT);
		$result = $stmt->execute();
		list($version) = $result->fetchArray();
		if ($version != getID3::VERSION) { // Check version number and clear cache if changed
			$this->clear_cache();
		}
		return parent::__construct();
	}

	/**
	* close the database connection
	*/
	public function __destruct() {
		$db=$this->db;
		$db->close();
	}

	/**
	* hold the sqlite db
	* @var SQLite Resource
	*/
	private $db;

	/**
	* table to use for caching
	* @var string $table
	*/
	private $table;

	/**
	* clear the cache
	* @access private
	* @return type
	*/
	private function clear_cache() {
		$db = $this->db;
		$sql = $this->delete_cache;
		$db->exec($sql);
		$sql = $this->set_version;
		$stmt = $db->prepare($sql);
		$stmt->bindValue(':filename', getID3::VERSION, SQLITE3_TEXT);
		$stmt->bindValue(':dirname', getID3::VERSION, SQLITE3_TEXT);
		$stmt->bindValue(':val', getID3::VERSION, SQLITE3_TEXT);
		return $stmt->execute();
	}

	/**
	* analyze file and cache them, if cached pull from the db
	* @param type $filename
	* @return boolean
	*/
	public function analyze($filename, $filesize=null, $original_filename='') {
		if (!file_exists($filename)) {
			return false;
		}
		// items to track for caching
		$filetime = filemtime($filename);
		$filesize_real = filesize($filename);
		// this will be saved for a quick directory lookup of analized files
		// ... why do 50 seperate sql quries when you can do 1 for the same result
		$dirname  = dirname($filename);
		// Lookup file
		$db = $this->db;
		$sql = $this->get_id3_data;
		$stmt = $db->prepare($sql);
		$stmt->bindValue(':filename', $filename,      SQLITE3_TEXT);
		$stmt->bindValue(':filesize', $filesize_real, SQLITE3_INTEGER);
		$stmt->bindValue(':filetime', $filetime,      SQLITE3_INTEGER);
		$res = $stmt->execute();
		list($result) = $res->fetchArray();
		if (count($result) > 0 ) {
			return unserialize(base64_decode($result));
		}
		// if it hasn't been analyzed before, then do it now
		$analysis = parent::analyze($filename, $filesize, $original_filename);
		// Save result
		$sql = $this->cache_file;
		$stmt = $db->prepare($sql);
		$stmt->bindValue(':filename', $filename,                           SQLITE3_TEXT);
		$stmt->bindValue(':dirname',  $dirname,                            SQLITE3_TEXT);
		$stmt->bindValue(':filesize', $filesize_real,                      SQLITE3_INTEGER);
		$stmt->bindValue(':filetime', $filetime,                           SQLITE3_INTEGER);
		$stmt->bindValue(':atime',    time(),                              SQLITE3_INTEGER);
		$stmt->bindValue(':val',      base64_encode(serialize($analysis)), SQLITE3_TEXT);
		$res = $stmt->execute();
		return $analysis;
	}

	/**
	* create data base table
	* this is almost the same as MySQL, with the exception of the dirname being added
	* @return type
	*/
	private function create_table() {
		$db = $this->db;
		$sql = $this->make_table;
		return $db->exec($sql);
	}

	/**
	* get cached directory
	*
	* This function is not in the MySQL extention, it's ment to speed up requesting multiple files
	* which is ideal for podcasting, playlists, etc.
	*
	* @access public
	* @param string $dir directory to search the cache database for
	* @return array return an array of matching id3 data
	*/
	public function get_cached_dir($dir) {
		$db = $this->db;
		$rows = array();
		$sql = $this->get_cached_dir;
		$stmt = $db->prepare($sql);
		$stmt->bindValue(':dirname', $dir, SQLITE3_TEXT);
		$res = $stmt->execute();
		while ($row=$res->fetchArray()) {
			$rows[] = unserialize(base64_decode($row));
		}
		return $rows;
	}

	/**
	* use the magical __get() for sql queries
	*
	* access as easy as $this->{case name}, returns NULL if query is not found
	*/
	public function __get($name) {
		switch($name) {
			case 'version_check':
				return "SELECT val FROM $this->table WHERE filename = :filename AND filesize = '-1' AND filetime = '-1' AND analyzetime = '-1'";
				break;
			case 'delete_cache':
				return "DELETE FROM $this->table";
				break;
			case 'set_version':
				return "INSERT INTO $this->table (filename, dirname, filesize, filetime, analyzetime, val) VALUES (:filename, :dirname, -1, -1, -1, :val)";
				break;
			case 'get_id3_data':
				return "SELECT val FROM $this->table WHERE filename = :filename AND filesize = :filesize AND filetime = :filetime";
				break;
			case 'cache_file':
				return "INSERT INTO $this->table (filename, dirname, filesize, filetime, analyzetime, val) VALUES (:filename, :dirname, :filesize, :filetime, :atime, :val)";
				break;
			case 'make_table':
				return "CREATE TABLE IF NOT EXISTS $this->table (filename VARCHAR(255) DEFAULT '', dirname VARCHAR(255) DEFAULT '', filesize INT(11) DEFAULT '0', filetime INT(11) DEFAULT '0', analyzetime INT(11) DEFAULT '0', val text, PRIMARY KEY (filename, filesize, filetime))";
				break;
			case 'get_cached_dir':
				return "SELECT val FROM $this->table WHERE dirname = :dirname";
				break;
		}
		return null;
	}

}