<?php
define(OGG_DIR, 'oggcasts');

header('Content-Type: text/xml');
$url=$_GET['cast'];

$cast = simplexml_load_file($url);
$urls = array();
$title = $cast->channel->title;

foreach($cast->channel->item as $item){
    if($item->enclosure['url']){
        $url = (string)$item->enclosure['url'];
        $file = basename($url);
        $noext = basename($file, '.ogg');
        $realpath = OGG_DIR."/$title/$noext.m4a";
        if (file_exists($realpath)){
            $item->enclosure['length'] = filesize($realpath);
            $item->enclosure['type'] = 'audio/x-m4a';
            $item->enclosure['url'] = "http://shion.pilif.home/".OGG_DIR."/".rawurlencode($title)."/$noext.m4a";
        }else
            unset($item->enclosure['length']); // mark for removal
    }
}

$dom = dom_import_simplexml($cast->channel);
$dellist = array();
foreach($dom->getElementsByTagName('item') as $el){
    $enc = $el->getElementsByTagName('enclosure')->item(0);
    if ($enc){ 
        if($enc->getAttribute('length') == ''){
           $dellist[] = $el;       
        }
    }else{
        $dellist[] = $el;
    }
}

while($el = array_pop($dellist)){
    $dom->removeChild($el);
}

echo $cast->asXML();
?>