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bencodetorrent.class.php
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bencodetorrent.class.php
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<?
/**
* Torrent class that contains some convenient functions related to torrent meta data
*/
class BencodeTorrent extends BencodeDecode {
private $PathKey = 'path';
public $Files = array();
public $Size = 0;
/**
* Create a list of the files in the torrent and their sizes as well as the total torrent size
*
* @return array with a list of files and file sizes
*/
public function file_list() {
if (empty($this->Dec)) {
return false;
}
$InfoDict =& $this->Dec['info'];
if (!isset($InfoDict['files'])) {
// Single-file torrent
$this->Size = (Int64::is_int($InfoDict['length'])
? Int64::get($InfoDict['length'])
: $InfoDict['length']);
$Name = (isset($InfoDict['name.utf-8'])
? $InfoDict['name.utf-8']
: $InfoDict['name']);
$this->Files[] = array($this->Size, $Name);
} else {
if (isset($InfoDict['path.utf-8']['files'][0])) {
$this->PathKey = 'path.utf-8';
}
foreach ($InfoDict['files'] as $File) {
$TmpPath = array();
foreach ($File[$this->PathKey] as $SubPath) {
$TmpPath[] = $SubPath;
}
$CurSize = (Int64::is_int($File['length'])
? Int64::get($File['length'])
: $File['length']);
$this->Files[] = array($CurSize, implode('/', $TmpPath));
$this->Size += $CurSize;
}
uasort($this->Files, function($a, $b) {
return strnatcasecmp($a[1], $b[1]);
});
}
return array($this->Size, $this->Files);
}
/**
* Find out the name of the torrent
*
* @return string torrent name
*/
public function get_name() {
if (empty($this->Dec)) {
return false;
}
if (isset($this->Dec['info']['name.utf-8'])) {
return $this->Dec['info']['name.utf-8'];
}
return $this->Dec['info']['name'];
}
/**
* Find out the total size of the torrent
*
* @return string torrent size
*/
public function get_size() {
if (empty($this->Files)) {
if (empty($this->Dec)) {
return false;
}
$FileList = $this->file_list();
}
return $FileList[0];
}
/**
* Checks if the "private" flag is present in the torrent
*
* @return true if the "private" flag is set
*/
public function is_private() {
if (empty($this->Dec)) {
return false;
}
return isset($this->Dec['info']['private']) && Int64::get($this->Dec['info']['private']) == 1;
}
/**
* Add the "private" flag to the torrent
*
* @return true if a change was required
*/
public function make_private() {
if (empty($this->Dec)) {
return false;
}
if ($this->is_private()) {
return false;
}
$this->Dec['info']['private'] = Int64::make(1);
ksort($this->Dec['info']);
return true;
}
/**
* Calculate the torrent's info hash
*
* @return info hash in hexadecimal form
*/
public function info_hash() {
if (empty($this->Dec) || !isset($this->Dec['info'])) {
return false;
}
return sha1($this->encode(false, 'info'));
}
/**
* Add the announce URL to a torrent
*/
public static function add_announce_url($Data, $Url) {
return 'd8:announce'.strlen($Url).':'.$Url . substr($Data, 1);
}
}