Download.php

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<?php

class HTTP_Request2_Observer_Download implements SplObserver
{
    protected $filename;
    protected $fp;

    public function __construct($filename)
    {
        $this->filename = $filename;
    }

    public function update(SplSubject $subject)
    {
        $event = $subject->getLastEvent();

        switch($event['name'])
        {
            case 'receivedHeaders':
                $this->fp = @fopen($this->filename, 'wb');
                if(!$this->fp)
                {
                    throw new Exception("Cannot open target file '{$filename}'");
                }
                break;

            case 'receivedBodyPart':
            case 'receivedEncodedBodyPart':
                fwrite($this->fp, $event['data']);
                break;

            case 'receivedBody':
                fclose($this->fp);
        }
    }
}