<?php
/**
* Torrent
*
* PHP version 5.2+ (with cURL extention enabled)
*
* LICENSE: This source file is subject to version 3 of the GNU GPL
* that is available through the world-wide-web at the following URI:
* http://www.gnu.org/licenses/gpl.html. If you did not receive a copy of
* the GNU GPL License and are unable to obtain it through the web, please
* send a note to adrien.gibrat@gmail.com so I can mail you a copy.
*
* 1) Features:
* - Decode torrent file or data from local file and distant url
* - Build torrent from source folder/file(s) or distant url
* - Super easy usage & syntax
* - Silent Exception error system
*
* 2) Usage example
* <code>
require_once 'Torrent.php';
// create torrent
$torrent = new Torrent( './path-to-file-or-folder', 'http://torrent.tracker/annonce' );
if ( ! $error = $torrent->error() ) // error method return the last error message
$torrent->save('test.torrent'); // save to disk
else
echo '<br>DEBUG: ',$error;
// print torrent infos
$torrent = new Torrent( './test.torrent' );
echo '<pre>private: ', $torrent->is_private() ? 'yes' : 'no',
'<br>annonce: ';
var_dump( $torrent->announce() );
echo '<br>name: ', $torrent->name(),
'<br>comment: ', $torrent->comment(),
'<br>piece_length: ', $torrent->piece_length(),
'<br>size: ', $torrent->size( 2 ),
'<br>hash info: ', $torrent->hash_info(),
'<br>stats: ';
var_dump( $torrent->scrape() );
echo '<br>content: ';
var_dump( $torrent->content() );
echo '<br>source: ',
$torrent;
// modify torrent
$torrent->announce('http://alternate-torrent.tracker/annonce'); // add a tracker
$torrent->announce(false); // reset announce trackers
$torrent->announce(array('http://torrent.tracker/annonce', 'http://alternate-torrent.tracker/annonce')); // set tracker(s), it also works with a 'one tracker' array...
$torrent->announce(array(array('http://torrent.tracker/annonce', 'http://alternate-torrent.tracker/annonce'), 'http://another-torrent.tracker/annonce')); // set tiered trackers
$torrent->comment('hello world');
$torrent->name('test torrent');
$torrent->is_private(true);
$torrent->httpseeds('http://file-hosting.domain/path/'); // Bittornado implementation
$torrent->url_list(array('http://file-hosting.domain/path/','http://another-file-hosting.domain/path/')); // GetRight implementation
// print errors
if ( $errors = $torrent->errors() ) // errors method return the error stack
var_dump( '<br>DEBUG: ', $errors );
// send to user
//$torrent->send();
* </code>
*
* @author Adrien Gibrat <adrien.gibrat@gmail.com>
* @tester Jeong, official tester ;) Thanks for your precious feedback
* @copyleft 2010 - Just use it!
* @license http://www.gnu.org/licenses/gpl.html GNU General Public License version 3
* @version Release: 1.2 (6 july 2010)
*/
class Torrent {
/**
* @const float Default http timeout
*/
const timeout = 30;
/**
* @var array List of error occured
*/
static protected $errors = array();
/** Read and decode torrent file/data OR build a torrent from source folder/file(s)
* Supported signatures:
* - Torrent(); // get an instance (usefull to scrape and check errors)
* - Torrent( string $torrent ); // analyse a torrent file
* - Torrent( string $torrent, string $announce );
* - Torrent( string $torrent, array $meta );
* - Torrent( string $file_or_folder ); // create a torrent file
* - Torrent( string $file_or_folder, string $announce_url, [int $piece_length] );
* - Torrent( string $file_or_folder, array $meta, [int $piece_length] );
* - Torrent( array $files_list );
* - Torrent( array $files_list, string $announce_url, [int $piece_length] );
* - Torrent( array $files_list, array $meta, [int $piece_length] );
* @param string|array torrent to read or source folder/file(s) (optional, to get an instance)
* @param string|array announce url or meta informations (optional)
* @param int piece length (optional)
*/
public function __construct ( $data = null, $meta = array(), $piece_length = 256 ) {
if ( is_null( $data ) )
return false;
if ( $piece_length < 32 || $piece_length > 4096 )
return self::set_error( new Exception( 'Invalid piece lenth, must be between 32 and 4096' ) );
if ( is_string( $meta ) )
$meta = array( 'announce' => $meta );
if ( $this->build( $data, $piece_length * 1024 ) )
$this->touch();
else
$meta = array_merge( $meta, $this->decode( $data ) );
foreach( $meta as $key => $value )
$this->{$key} = $value;
}
/** Convert the current Torrent instance in torrent format
* @return string encoded torrent data
*/
public function __toString() {
return $this->encode( $this );
}
/** Return last error message
* @return string|boolean last error message or false if none
*/
public function error() {
return empty( self::$errors ) ?
false :
self::$errors[0]->getMessage();
}
/** Return Errors
* @return array|boolean error list or false if none
*/
public function errors() {
return empty( self::$errors ) ?
false :
self::$errors;
}
/**** Getters and setters ****/
/** Getter and setter of torrent announce url / list
* If the argument is a string, announce url is added to announce list (or set as announce if announce is not set)
* If the argument is an array/object, set announce url (with first url) and list (if array has more than one url), tiered list supported
* If the argument is false announce url & list are unset
* @param null|false|string|array announce url / list, reset all if false (optional, if omitted it's a getter)
* @return string|array|null announce url / list or null if not set
*/
public function announce ( $announce = null ) {
if ( is_null( $announce ) )
return ! isset( $this->{'announce-list'} ) ?
isset( $this->announce ) ? $this->announce : null :
$this->{'announce-list'};
$this->touch();
if ( is_string( $announce ) && isset( $this->announce ) )
return $this->{'announce-list'} = self::announce_list( isset( $this->{'announce-list'} ) ? $this->{'announce-list'} : $this->announce, $announce );
unset( $this->{'announce-list'} );
if ( is_array( $announce ) || is_object( $announce ) )
if ( ( $this->announce = self::first_announce( $announce ) ) && count( $announce ) > 1 )
return $this->{'announce-list'} = self::announce_list( $announce );
else
return $this->announce;
if ( ! isset( $this->announce ) && $announce )
return $this->announce = (string) $announce;
unset( $this->announce );
}
/** Getter and setter of torrent comment
* @param null|string comment (optional, if omitted it's a getter)
* @return string|null comment or null if not set
*/
public function comment ( $comment = null ) {
return is_null( $comment ) ?
isset( $this->comment ) ? $this->comment : null :
$this->touch( $this->comment = (string) $comment );
}
/** Getter and setter of torrent name
* @param null|string name (optional, if omitted it's a getter)
* @return string|null name or null if not set
*/
public function name ( $name = null ) {
return is_null( $name ) ?
isset( $this->info['name'] ) ? $this->info['name'] : null :
$this->touch( $this->info['name'] = (string) $name );
}
/** Getter and setter of private flag
* @param null|boolean is private or not (optional, if omitted it's a getter)
* @return boolean private flag
*/
public function is_private ( $private = null ) {
return is_null( $private ) ?
! empty( $this->info['private'] ) :
$this->touch( $this->info['private'] = $private ? 1 : 0 );
}
/** Getter and setter of webseed(s) url list ( GetRight implementation )
* @param null|string|array webseed or webseeds mirror list (optional, if omitted it's a getter)
* @return string|array|null webseed(s) or null if not set
*/
public function url_list ( $urls = null ) {
return is_null( $urls ) ?
isset( $this->{'url-list'} ) ? $this->{'url-list'} : null :
$this->touch( $this->{'url-list'} = is_string( $urls) ? $urls : (array) $urls );
}
/** Getter and setter of httpseed(s) url list ( Bittornado implementation )
* @param null|string|array httpseed or httpseeds mirror list (optional, if omitted it's a getter)
* @return array|null httpseed(s) or null if not set
*/
public function httpseeds ( $urls = null ) {
return is_null( $urls ) ?
isset( $this->httpseeds ) ? $this->httpseeds : null :
$this->touch( $this->httpseeds = (array) $urls );
}
/**** Analyze BitTorrent ****/
/** Get piece length
* @return integer piece length or null if not set
*/
public function piece_length () {
return isset( $this->info['piece length'] ) ?
$this->info['piece length'] :
null;
}
/** Compute hash info
* @return string hash info or null if info not set
*/
public function hash_info () {
return isset( $this->info ) ?
sha1( self::encode( $this->info ) ) :
null;
}
/** List torrent content
* @param integer|null size precision (optional, if omitted returns sizes in bytes)
* @return array file(s) and size(s) list, files as keys and sizes as values
*/
public function content ( $precision = null ) {
$files = array();
if ( isset( $this->info['files'] ) && is_array( $this->info['files'] ) )
foreach ( $this->info['files'] as $file )
$files[self::path( $file['path'], $this->info['name'] )] = $precision ?
self::format( $file['length'], $precision ) :
$file['length'];
elseif ( isset( $this->info['name'] ) )
$files[$this->info['name']] = $precision ?
self::format( $this->info['length'], $precision ) :
$this->info['length'];
return $files;
}
/** List torrent content pieces and offset(s)
* @return array file(s) and pieces/offset(s) list, file(s) as keys and pieces/offset(s) as values
*/
public function offset () {
$files = array();
$size = 0;
if ( isset( $this->info['files'] ) && is_array( $this->info['files'] ) )
foreach ( $this->info['files'] as $file )
$files[self::path( $file['path'], $this->info['name'] )] = array(
'startpiece' => floor( $size / $this->info['piece length'] ),
'offset' => fmod( $size, $this->info['piece length'] ),
'size' => $size += $file['length'],
'endpiece' => floor( $size / $this->info['piece length'] )
);
elseif ( isset( $this->info['name'] ) )
$files[$this->info['name']] = array(
'startpiece' => 0,
'offset' => 0,
'size' => $this->info['length'],
'endpiece' => floor( $this->info['length'] / $this->info['piece length'] )
);
return $files;
}
/** Sum torrent content size
* @param integer|null size precision (optional, if omitted returns size in bytes)
* @return integer|string file(s) size
*/
public function size ( $precision = null ) {
$size = 0;
if ( isset( $this->info['files'] ) && is_array( $this->info['files'] ) )
foreach ( $this->info['files'] as $file )
$size += $file['length'];
elseif ( isset( $this->info['name'] ) )
$size = $this->info['length'];
return is_null( $precision ) ?
$size :
self::format( $size, $precision );
}
/** Request torrent statistics from scrape page USING CURL!!
* @param string|array announce or scrape page url (optional, to request an alternative tracker BUT requirered for static call)
* @param string torrent hash info (optional, requirered ONLY for static call)
* @param float read timeout in seconds (optional, default to self::timeout 30s)
* @return array tracker torrent statistics
*/
/* static */ public function scrape ( $announce = null, $hash_info = null, $timeout = self::timeout ) {
$packed_hash = urlencode( pack('H*', $hash_info ? $hash_info : $this->hash_info() ) );
$handles = $scrape = array();
if ( ! function_exists( 'curl_multi_init' ) )
return self::set_error( new Exception( 'Install CURL with "curl_multi_init" enabled' ) );
$curl = curl_multi_init();
foreach ( (array) ($announce ? $announce : $this->announce()) as $tier )
foreach ( (array) $tier as $tracker ) {
$tracker = str_ireplace( array( 'udp://', '/announce', ':80/' ), array( 'http://', '/scrape', '/' ), $tracker );
if ( isset( $handles[$tracker] ) )
continue;
$handles[$tracker] = curl_init( $tracker . '?info_hash=' . $packed_hash );
curl_setopt( $handles[$tracker], CURLOPT_RETURNTRANSFER, true );
curl_setopt( $handles[$tracker], CURLOPT_TIMEOUT, $timeout );
curl_multi_add_handle( $curl, $handles[$tracker] );
}
do {
while ( ( $state = curl_multi_exec( $curl, $running ) ) == CURLM_CALL_MULTI_PERFORM );
if( $state != CURLM_OK )
continue;
while ( $done = curl_multi_info_read( $curl ) ) {
$info = curl_getinfo( $done['handle'] );
$tracker = array_shift( explode( '?', $info['url'], 2 ) );
if ( empty( $info['http_code'] ) )
continue $scrape[$tracker] = self::set_error( new Exception( 'Tracker request timeout (' . $timeout . 's)' ), true );
elseif ( $info['http_code'] != 200 )
continue $scrape[$tracker] = self::set_error( new Exception( 'Tracker request failed (' . $info['http_code'] . ' code)' ), true );
$stats = self::decode_data( curl_multi_getcontent( $done['handle'] ) );
curl_multi_remove_handle( $curl, $done['handle'] );
$scrape[$tracker] = empty( $stats['files'] ) ?
self::set_error( new Exception( 'Empty scrape data' ), true ) :
array_shift( $stats['files'] ) + ( empty( $stats['flags'] ) ? array() : $stats['flags'] );
}
} while ( $running );
curl_multi_close( $curl );
return $scrape;
}
/**** Save and Send ****/
/** Save torrent file to disk
* @param null|string name of the file (optional)
* @return boolean file has been saved or not
*/
public function save ( $filename = null ) {
return file_put_contents( is_null( $filename ) ? $this->info['name'] . '.torrent' : $filename, $this->encode( $this ) );
}
/** Send torrent file to client
* @param null|string name of the file (optional)
* @return void script exit
*/
public function send ( $filename = null ) {
$data = $this->encode( $this );
header( 'Content-type: application/x-bittorrent' );
header( 'Content-Length: ' . strlen( $data ) );
header( 'Content-Disposition: attachment; filename="' . ( is_null( $filename ) ? $this->info['name'] . '.torrent' : $filename ) . '"' );
exit( $data );
}
/**** Encode BitTorrent ****/
/** Encode torrent data
* @param mixed data to encode
* @return string torrent encoded data
*/
static public function encode ( $mixed ) {
switch ( gettype( $mixed ) ) {
case 'integer':
case 'double':
return self::encode_integer( $mixed );
case 'object':
$mixed = (array) $mixed; //Thanks to W-Shadow: http://w-shadow.com/blog/2008/11/11/parse-edit-and-create-torrent-files-with-php/
case 'array':
return self::encode_array( $mixed );
default:
return self::encode_string( (string) $mixed );
}
}
/** Encode torrent string
* @param string string to encode
* @return string encoded string
*/
static private function encode_string ( $string ) {
return strlen( $string ) . ':' . $string;
}
/** Encode torrent integer
* @param integer integer to encode
* @return string encoded integer
*/
static private function encode_integer ( $integer ) {
return 'i' . $integer . 'e';
}
/** Encode torrent dictionary or list
* @param array array to encode
* @return string encoded dictionary or list
*/
static private function encode_array ( $array ) {
if ( self::is_list( $array ) ) {
$return = 'l';
foreach ( $array as $value )
$return .= self::encode( $value );
} else {
ksort( $array, SORT_STRING );
$return = 'd';
foreach ( $array as $key => $value )
$return .= self::encode( strval( $key ) ) . self::encode( $value );
}
return $return . 'e';
}
/**** Decode BitTorrent ****/
/** Decode torrent data or file
* @param string data or file path to decode
* @return array decoded torrent data
*/
static protected function decode ( $string ) {
$data = is_file( $string ) || self::url_exists( $string ) ?
self::file_get_contents( $string ) :
$string;
return (array) self::decode_data( $data );
}
/** Decode torrent data
* @param string data to decode
* @return array decoded torrent data
*/
static private function decode_data ( & $data ) {
switch( self::char( $data ) ) {
case 'i':
$data = substr( $data, 1 );
return self::decode_integer( $data );
case 'l':
$data = substr( $data, 1 );
return self::decode_list( $data );
case 'd':
$data = substr( $data, 1 );
return self::decode_dictionary( $data );
default:
return self::decode_string( $data );
}
}
/** Decode torrent dictionary
* @param string data to decode
* @return array decoded dictionary
*/
static private function decode_dictionary ( & $data ) {
$dictionary = array();
$previous = null;
while ( ( $char = self::char( $data ) ) != 'e' ) {
if ( $char === false )
return self::set_error( new Exception( 'Unterminated dictionary' ) );
if ( ! ctype_digit( $char ) )
return self::set_error( new Exception( 'Invalid dictionary key' ) );
$key = self::decode_string( $data );
if ( isset( $dictionary[$key] ) )
return self::set_error( new Exception( 'Duplicate dictionary key' ) );
if ( $key < $previous )
return self::set_error( new Exception( 'Missorted dictionary key' ) );
$dictionary[$key] = self::decode_data( $data );
$previous = $key;
}
$data = substr( $data, 1 );
return $dictionary;
}
/** Decode torrent list
* @param string data to decode
* @return array decoded list
*/
static private function decode_list ( & $data ) {
$list = array();
while ( ( $char = self::char( $data ) ) != 'e' ) {
if ( $char === false )
return self::set_error( new Exception( 'Unterminated list' ) );
$list[] = self::decode_data( $data );
}
$data = substr( $data, 1 );
return $list;
}
/** Decode torrent string
* @param string data to decode
* @return string decoded string
*/
static private function decode_string ( & $data ) {
if ( self::char( $data ) === '0' && substr( $data, 1, 1 ) != ':' )
self::set_error( new Exception( 'Invalid string length, leading zero' ) );
if ( ! $colon = @strpos( $data, ':' ) )
return self::set_error( new Exception( 'Invalid string length, colon not found' ) );
$length = intval( substr( $data, 0, $colon ) );
if ( $length + $colon + 1 > strlen( $data ) )
return self::set_error( new Exception( 'Invalid string, input too short for string length' ) );
$string = substr( $data, $colon + 1, $length );
$data = substr( $data, $colon + $length + 1 );
return $string;
}
/** Decode torrent integer
* @param string data to decode
* @return integer decoded integer
*/
static private function decode_integer ( & $data ) {
$start = 0;
$end = strpos( $data, 'e');
if ( $end === 0 )
self::set_error( new Exception( 'Empty integer' ) );
if ( self::char( $data ) == '-' )
$start++;
if ( substr( $data, $start, 1 ) == '0' && ( $start != 0 || $end > $start + 1 ) )
self::set_error( new Exception( 'Leading zero in integer' ) );
if ( ! ctype_digit( substr( $data, $start, $end ) ) )
self::set_error( new Exception( 'Non-digit characters in integer' ) );
$integer = substr( $data, 0, $end );
$data = substr( $data, $end + 1 );
return $integer + 0;
}
/**** Internal Helpers ****/
/** Build torrent info
* @param string|array source folder/file(s) path
* @param integer piece length
* @return array|boolean torrent info or false if data isn't folder/file(s)
*/
protected function build ( $data, $piece_length ) {
if ( is_null( $data ) )
return false;
elseif ( is_array( $data ) && self::is_list( $data ) )
return $this->info = $this->files( $data, $piece_length );
elseif ( is_dir( $data ) )
return $this->info = $this->folder( $data, $piece_length );
elseif ( ( is_file( $data ) || self::url_exists( $data ) ) && ! self::is_torrent( $data ) )
return $this->info = $this->file( $data, $piece_length );
else
return false;
}
/** Set torrent creator and creation date
* @param any param
* @return any param
*/
protected function touch ( $void = null ) {
$this->{'created by'} = 'Torrent PHP Class - Adrien Gibrat';
$this->{'creation date'} = time();
return $void;
}
/** Add an error to errors stack
* @param Exception error to add
* @param boolean return error message or not (optional, default to false)
* @return boolean|string return false or error message if requested
*/
static protected function set_error ( $exception, $message = false ) {
return ( array_unshift( self::$errors, $exception ) && $message ) ? $exception->getMessage() : false;
}
/** Build announce list
* @param string|array announce url / list
* @param string|array announce url / list to add (optionnal)
* @return array announce list (array of arrays)
*/
static protected function announce_list( $announce, $merge = array() ) {
return array_map( create_function( '$a', 'return (array) $a;' ), array_merge( (array) $announce, (array) $merge ) );
}
/** Get the first announce url in a list
* @param array announce list (array of arrays if tiered trackers)
* @return string first announce url
*/
static protected function first_announce( $announce ) {
while ( is_array( $announce ) )
$announce = reset( $announce );
return $announce;
}
/** Helper to pack data hash
* @param string data
* @return string packed data hash
*/
static protected function pack ( & $data ) {
return pack('H*', sha1( $data ) ) . ( $data = null );
}
/** Helper to build file path
* @param array file path
* @param string base folder
* @return string real file path
*/
static protected function path ( $path, $folder ) {
array_unshift( $path, $folder );
return join( DIRECTORY_SEPARATOR, $path );
}
/** Helper to test if an array is a list
* @param array array to test
* @return boolean is the array a list or not
*/
static protected function is_list ( $array ) {
foreach ( array_keys( $array ) as $key )
if ( ! is_int( $key ) )
return false;
return true;
}
/** Build pieces depending on piece length from a file handler
* @param ressource file handle
* @param integer piece length
* @param boolean is last piece
* @return string pieces
*/
private function pieces ( $handle, $piece_length, $last = true ) {
static $piece, $length;
if ( empty( $length ) )
$length = $piece_length;
$pieces = null;
while ( ! feof( $handle ) ) {
if ( ( $length = strlen( $piece .= fread( $handle, $length ) ) ) == $piece_length )
$pieces .= self::pack( $piece );
elseif ( ( $length = $piece_length - $length ) < 0 )
return self::set_error( new Exception( 'Invalid piece length!' ) );
}
fclose( $handle );
return $pieces . ( $last && $piece ? self::pack( $piece ) : null);
}
/** Build torrent info from single file
* @param string file path
* @param integer piece length
* @return array torrent info
*/
private function file ( $file, $piece_length ) {
if ( ! $handle = self::fopen( $file, $size = self::filesize( $file ) ) )
return self::set_error( new Exception( 'Failed to open file: "' . $file . '"' ) );
return array(
'length' => $size,
'name' => end( explode( DIRECTORY_SEPARATOR, $file ) ),
'piece length' => $piece_length,
'pieces' => $this->pieces( $handle, $piece_length )
);
}
/** Build torrent info from files
* @param array file list
* @param integer piece length
* @return array torrent info
*/
private function files ( $files, $piece_length ) {
$files = array_map( 'realpath', $files );
sort( $files );
usort( $files, create_function( '$a,$b', 'return strrpos($a,DIRECTORY_SEPARATOR)-strrpos($b,DIRECTORY_SEPARATOR);' ) );
$path = explode( DIRECTORY_SEPARATOR, dirname( realpath( current( $files ) ) ) );
$pieces = null; $info_files = array(); $count = count($files) - 1;
foreach ( $files as $i => $file ) {
if ( $path != array_intersect_assoc( $file_path = explode( DIRECTORY_SEPARATOR, $file ), $path ) )
continue self::set_error( new Exception( 'Files must be in the same folder: "' . $file . '" discarded' ) );
if ( ! $handle = self::fopen( $file, $filesize = self::filesize( $file ) ) )
continue self::set_error( new Exception( 'Failed to open file: "' . $file . '" discarded' ) );
$pieces .= $this->pieces( $handle, $piece_length, $count == $i );
$info_files[] = array(
'length' => $filesize,
'path' => array_diff( $file_path, $path )
);
}
return array(
'files' => $info_files,
'name' => end( $path ),
'piece length' => $piece_length,
'pieces' => $pieces
);
}
/** Build torrent info from folder content
* @param string folder path
* @param integer piece length
* @return array torrent info
*/
private function folder ( $dir, $piece_length ) {
return $this->files( self::scandir( $dir ), $piece_length );
}
/** Helper to return the first char of encoded data
* @param string encoded data
* @return string|boolean first char of encoded data or false if empty data
*/
static private function char ( $data ) {
return empty( $data ) ?
false :
substr( $data, 0, 1 );
}
/**** Public Helpers ****/
/** Helper to format size in bytes to human readable
* @param integer size in bytes
* @param integer precision after coma
* @return string formated size in appropriate unit
*/
static public function format ( $size, $precision = 2 ) {
$units = array ('octets', 'Ko', 'Mo', 'Go', 'To');
while( ( $next = next( $units ) ) && $size > 1024 )
$size /= 1024;
return round( $size, $precision ) . ' ' . ( $next ? prev( $units ) : end( $units ) );
}
/** Helper to return filesize (even bigger than 2Gb -linux only- and distant files size)
* @param string file path
* @return double|boolean filesize or false if error
*/
static public function filesize ( $file ) {
if ( is_file( $file ) )
return (double) sprintf( '%u', @filesize( $file ) );
else if ( $content_length = preg_grep( $pattern = '#^Content-Length:\s+(\d+)$#i', (array) @get_headers( $file ) ) )
return (int) preg_replace( $pattern, '$1', reset( $content_length ) );
}
/** Helper to open file to read (even bigger than 2Gb, linux only)
* @param string file path
* @param integer|double file size (optional)
* @return ressource|boolean file handle or false if error
*/
static public function fopen ( $file, $size = null ) {
if ( ( is_null( $size ) ? self::filesize( $file ) : $size ) <= 2 * pow( 1024, 3 ) )
return fopen( $file, 'r' );
elseif ( PHP_OS != 'Linux' )
return self::set_error( new Exception( 'File size is greater than 2GB. This is only supported under Linux' ) );
elseif ( ! is_readable( $file ) )
return false;
else
return popen( 'cat ' . escapeshellarg( realpath( $file ) ), 'r' );
}
/** Helper to scan directories files and sub directories recursivly
* @param string directory path
* @return array directory content list
*/
static public function scandir ( $dir ) {
$paths = array();
foreach ( scandir( $dir ) as $item )
if ( $item != '.' && $item != '..' )
if ( is_dir( $path = realpath( $dir . DIRECTORY_SEPARATOR . $item ) ) )
$paths = array_merge( self::scandir( $path ), $paths );
else
$paths[] = $path;
return $paths;
}
/** Helper to check if url exists
* @param string url to check
* @return boolean does the url exist or not
*/
static public function url_exists ( $url ) {
return preg_match( '#^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$#i', $url ) ?
(bool) preg_grep( '#^HTTP/.*\s(200|304)\s#', (array) @get_headers( $url ) ) :
false;
}
/** Helper to check if a file is a torrent
* @param string file location
* @param float http timeout (optional, default to self::timeout 30s)
* @return boolean is the file a torrent or not
*/
static public function is_torrent ( $file, $timeout = self::timeout ) {
return self::file_get_contents( $file, $timeout, 0, 11 ) === 'd8:announce';
}
/** Helper to get (distant) file content
* @param string file location
* @param float http timeout (optional, default to self::timeout 30s)
* @param integer starting offset (optional, default to null)
* @param integer content length (optional, default to null)
* @return string|boolean file content or false if error
*/
static public function file_get_contents ( $file, $timeout = self::timeout, $offset = null, $length = null ) {
if ( is_file( $file ) || ini_get( 'allow_url_fopen' ) ) {
$context = ! is_file( $file ) && $timeout ?
stream_context_create( array( 'http' => array( 'timeout' => $timeout ) ) ) :
null;
return ! is_null( $offset ) ? $length ?
@file_get_contents( $file, false, $context, $offset, $length ) :
@file_get_contents( $file, false, $context, $offset ) :
@file_get_contents( $file, false, $context );
} elseif ( ! function_exists( 'curl_init' ) )
return self::set_error( new Exception( 'Install CURL or enable "allow_url_fopen"' ) );
$handle = curl_init( $file );
if ( $timeout )
curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );
if ( $offset || $length )
curl_setopt( $handle, CURLOPT_RANGE, $offset . '-' . ( $length ? $offset + $length -1 : null ) );
curl_setopt( $handle, CURLOPT_RETURNTRANSFER, 1 );
$content = curl_exec( $handle );
$size = curl_getinfo( $handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD );
curl_close( $handle );
return ( $offset && $size == -1 ) || ( $length && $length != $size ) ? $length ?
substr( $content, $offset, $length) :
substr( $content, $offset) :
$content;
}
}
?>
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