<?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.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
    
private $cursor;
    private 
$connection;


    
// public: constructor - see top of this file for cache type and cache_options
    
public function __construct($host$database$username$password$table='getid3_cache') {

        
// 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 '';
        
$SQLquery  'SELECT `value`';
        
$SQLquery .= ' FROM `'.mysql_real_escape_string($this->table).'`';
        
$SQLquery .= ' WHERE (`filename` = \''.mysql_real_escape_string(getID3::VERSION).'\')';
        
$SQLquery .= ' AND (`filesize` = -1)';
        
$SQLquery .= ' AND (`filetime` = -1)';
        
$SQLquery .= ' AND (`analyzetime` = -1)';
        if (
$this->cursor mysql_query($SQLquery$this->connection)) {
            list(
$version) = mysql_fetch_array($this->cursor);
        }
        if (
$version != getID3::VERSION) {
            
$this->clear_cache();
        }

        
parent::__construct();
    }



    
// public: clear cache
    
public function clear_cache() {

        
$this->cursor mysql_query('DELETE FROM `'.mysql_real_escape_string($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
    
public function analyze($filename$filesize=null$original_filename='') {

        if (
file_exists($filename)) {

            
// Short-hands
            
$filetime filemtime($filename);
            
$filesize =  filesize($filename);

            
// Lookup file
            
$SQLquery  'SELECT `value`';
            
$SQLquery .= ' FROM `'.mysql_real_escape_string($this->table).'`';
            
$SQLquery .= ' WHERE (`filename` = \''.mysql_real_escape_string($filename).'\')';
            
$SQLquery .= '   AND (`filesize` = \''.mysql_real_escape_string($filesize).'\')';
            
$SQLquery .= '   AND (`filetime` = \''.mysql_real_escape_string($filetime).'\')';
            
$this->cursor mysql_query($SQLquery$this->connection);
            if (
mysql_num_rows($this->cursor) > 0) {
                
// Hit
                
list($result) = mysql_fetch_array($this->cursor);
                return 
unserialize(base64_decode($result));
            }
        }

        
// Miss
        
$analysis parent::analyze($filename$filesize$original_filename);

        
// Save result
        
if (file_exists($filename)) {
            
$SQLquery  'INSERT INTO `'.mysql_real_escape_string($this->table).'` (`filename`, `filesize`, `filetime`, `analyzetime`, `value`) VALUES (';
            
$SQLquery .=   '\''.mysql_real_escape_string($filename).'\'';
            
$SQLquery .= ', \''.mysql_real_escape_string($filesize).'\'';
            
$SQLquery .= ', \''.mysql_real_escape_string($filetime).'\'';
            
$SQLquery .= ', \''.mysql_real_escape_string(time()   ).'\'';
            
$SQLquery .= ', \''.mysql_real_escape_string(base64_encode(serialize($analysis))).'\')';
            
$this->cursor mysql_query($SQLquery$this->connection);
        }
        return 
$analysis;
    }



    
// private: (re)create sql table
    
private function create_table($drop=false) {

        
$SQLquery  'CREATE TABLE IF NOT EXISTS `'.mysql_real_escape_string($this->table).'` (';
        
$SQLquery .=   '`filename` VARCHAR(500) NOT NULL DEFAULT \'\'';
        
$SQLquery .= ', `filesize` INT(11) NOT NULL DEFAULT \'0\'';
        
$SQLquery .= ', `filetime` INT(11) NOT NULL DEFAULT \'0\'';
        
$SQLquery .= ', `analyzetime` INT(11) NOT NULL DEFAULT \'0\'';
        
$SQLquery .= ', `value` LONGTEXT NOT NULL';
        
$SQLquery .= ', PRIMARY KEY (`filename`, `filesize`, `filetime`)) ENGINE=MyISAM';
        
$this->cursor mysql_query($SQLquery$this->connection);
        echo 
mysql_error($this->connection);
    }
}