<?php

class TorrentFile {
	var $index;
	var $source;
	var $final_array;


	function handler() {
		$char = $this->source[$this->index];

		if (is_numeric($char)) return $this->handler_string();
		if ($char == 'i') {
			++$this->index;
			return $this->handler_int();
		}
		if ($char=='l') {
			++$this->index;
			return $this->handler_list();
		}
		if ($char=='d') {
			++$this->index;
			return $this->handler_dictonary();
		}

		die("MAIN HANDLER: UNEXPECTED CHAR (position: $this->index): ".$char);
	}


	function handler_int() {
		$current_char='';
		$number = "";

		while (($current_char = $this->source[$this->index]) != 'e') {
			++$this->index;
			$number .= $current_char;
		}

		++$this->index;

		return (int) $number;
	}



	function handler_string(){
		$size ="";
		while($this->source[$this->index] != ':') {
			$size .= $this->source[$this->index];
			++$this->index;
		}

		$i = ++$this->index;
		$this->index += $size;

		$x= substr($this->source, $i, $size);

		return $x;
	}

	function handler_list() {
		$return_list = array();

		while ($this->source[$this->index] != 'e') {
			$this->index1 = $this->index;
			$return_list[] = $this->handler();
			if ($this->index1 == $this->index) die("INFINITE LOOP IN THE LIST");
		}
		++$this->index;

		return $return_list;
	}

	function handler_dictonary() {
		$return_dict = array();

		while ($this->source[$this->index] != 'e') {
			$this->index1 = $this->index;
			$return_dict[$this->handler_string()] = $this->handler();
			if ($this->index1 == $this->index) die("INFINITE LOOP IN THE DICTONARY");
		}
		++$this->index;

		return $return_dict;
	}


	function parse_file($filename) {
		$this->source = file_get_contents($filename);

		$this->index = 0;
		$filesize = strlen($this->source);

		$this->final_array=array();

		while($this->index<$filesize) {
			$this->index1 = $this->index;
			$this->final_array[] =$this->handler();
			if ($this->index1 == $this->index) die("INFINITE LOOP IN THE ROOT LIST");
		}

		$this->source = '';
		return $this->final_array;
	}
}


$x = new TorrentFile();
var_dump($x->parse_file("vertigo2.torrent"));

?>