Pony.fm/app/Library/getid3/getid3/extension.cache.mysql.php

<?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);
    }
}