<?php
// 기본적으로 UTF-8 형식임.

// Protect our namespace using a class
class BDecode {
	function numberdecode($wholefile, $offset) {
		// Funky handling of negative numbers and zero
		$negative = false;
		if ($wholefile[$offset] == '-') {
			$negative = true;
			$offset++;
		}
		if ($wholefile[$offset] == '0') {
			$offset++;
			if ($negative)
				return array(false);
			if ($wholefile[$offset] == ':' || $wholefile[$offset] == 'e')
				return array(0, ++$offset);
			return array(false);
		}
		$ret[0] = 0;
		for(;;) {
			if ($wholefile[$offset] >= '0' && $wholefile[$offset] <= '9') {
				$ret[0] *= 10;
				//Added 2005.02.21 - VisiGod
	       //Changing the type of variable from integer to double to prevent a numeric overflow   
				settype($ret[0],'double');
				//Added 2005.02.21 - VisiGod
				$ret[0] += ord($wholefile[$offset]) - ord('0');
				$offset++;
			}	else if ($wholefile[$offset] == 'e' || $wholefile[$offset] == ':') {
				// Tolerate : or e because this is a multiuse function
				$ret[1] = $offset+1;
				if ($negative) {
					if ($ret[0] == 0)
						return array(false);
					$ret[0] = - $ret[0];
				}
				return $ret;
			} else return array(false);
		}
	}

	function decodeEntry($wholefile, $offset=0) {
		if ($wholefile[$offset] == 'd')
			return $this->decodeDict($wholefile, $offset);
		if ($wholefile[$offset] == 'l')
			return $this->decodelist($wholefile, $offset);
		if ($wholefile[$offset] == 'i')
			return $this->numberdecode($wholefile, ++$offset);
		// String value: decode number, then grab substring

		$info = $this->numberdecode($wholefile, $offset);
		if ($info[0] === false)
			return array(false);
		$ret[0] = substr($wholefile, $info[1], $info[0]);
		$ret[1] = $info[1]+strlen($ret[0]);
		return $ret;
	}

	function decodeList($wholefile, $offset) {
		if ($wholefile[$offset] != 'l')
			return array(false);
		$offset++;
		$ret = array();
		for ($i=0;;$i++) {
			if ($wholefile[$offset] == 'e')
				break;
			$value = $this->decodeEntry($wholefile, $offset);
			if ($value[0] === false)
				return array(false);
			$ret[$i] = $value[0];
			$offset = $value[1];
		}
		// The empty list is an empty array. Seems fine.
		return array(0=>$ret, 1=>++$offset);
	}

	// Tries to construct an array
	function decodeDict($wholefile, $offset=0) {
		if ($wholefile[$offset] == 'l')
			return $this->decodeList($wholefile, $offset);
		if ($wholefile[$offset] != 'd')
			return false;
		$ret=array();
		$offset++;
		for (;;) {	
			if ($wholefile[$offset] == 'e')	{
				$offset++;
				break;
			}
			$left = $this->decodeEntry($wholefile, $offset);
			if (!$left[0])
				return false;
			$offset = $left[1];
			if ($wholefile[$offset] == 'd') {
				// Recurse
				$value = $this->decodedict($wholefile, $offset);
				if (!$value[0])
					return false;
				$ret[addslashes($left[0])] = $value[0];
				$offset= $value[1];
				continue;
			}
			if ($wholefile[$offset] == 'l') {
				$value = $this->decodeList($wholefile, $offset);
				if (!$value[0] && is_bool($value[0]))
					return false;
				$ret[addslashes($left[0])] = $value[0];
				$offset = $value[1];
				continue;
			}
			$value = $this->decodeEntry($wholefile, $offset);
			if ($value[0] === false)
				return false;
			$ret[addslashes($left[0])] = $value[0];
			$offset = $value[1];
		}
		return array(0=>(empty($ret)?true:$ret), 1=>$offset);
	}
} // End of class declaration.

// Use this function. eg:  BDecode("d8:announce44:http://www. ... e");
function BDecode($wholefile) {
	$decoder = new BDecode;
	$return = $decoder->decodeEntry($wholefile);
	return $return[0];
}

// We'll protect the namespace of our code
// using a class
class BEncode {
	// Dictionary keys must be sorted. foreach tends to iterate over the order
	// the array was made, so we make a new one in sorted order. :)
	function makeSorted($array) {
		// Shouldn't happen!
		if (empty($array))
			return $array;
		$i = 0;
		foreach($array as $key => $dummy)
			$keys[$i++] = stripslashes($key);
		sort($keys);
		for ($i=0; isset($keys[$i]); $i++)
			$return[addslashes($keys[$i])] = $array[addslashes($keys[$i])];
		return $return;
	}

	// Encodes strings, integers and empty dictionaries.
	// $unstrip is set to true when decoding dictionary keys
	function encodeEntry($entry, &$fd, $unstrip = false) {
		if (is_bool($entry)) {
			$fd .= 'de';
			return;
		}
		if (is_int($entry) || is_float($entry)) {
			$fd .= 'i'.$entry.'e';
			return;
		}
		if ($unstrip)
			$myentry = stripslashes($entry);
		else
			$myentry = $entry;
		$length = strlen($myentry);
		$fd .= $length.':'.$myentry;
	}

	// Encodes lists
	function encodeList($array, &$fd) {
		$fd .= 'l';
		// The empty list is defined as array();
		if (empty($array)) {
			$fd .= 'e';
			return;
		}
		for ($i = 0; isset($array[$i]); $i++)
			$this->decideEncode($array[$i], $fd);
		$fd .= 'e';
	}

	// Passes lists and dictionaries accordingly, and has encodeEntry handle
	// the strings and integers.
	function decideEncode($unknown, &$fd) {
		if (is_array($unknown)) {
			if (isset($unknown[0]) || empty($unknown))
				return $this->encodeList($unknown, $fd);
			else
				return $this->encodeDict($unknown, $fd);
		}
		$this->encodeEntry($unknown, $fd);
	}

	// Encodes dictionaries
	function encodeDict($array, &$fd) {
		$fd .= 'd';
		if (is_bool($array)) {
			$fd .= 'e';
			return;
		}
		// NEED TO SORT!
		$newarray = $this->makeSorted($array);
		foreach($newarray as $left => $right) {
			$this->encodeEntry($left, $fd, true);
			$this->decideEncode($right, $fd);
		}
		$fd .= 'e';
	}
} // End of class declaration.

// Use this function in your own code.
function BEncode($array) {
	$string = '';
	$encoder = new BEncode;
	$encoder->decideEncode($array, $string);
	return $string;
}

$url = trim($_GET[url]);
if ($url) {
		$alltorrent = trim(Yreadfile($url, ''));
} else exit;
if ($alltorrent == "") exit;
$array = BDecode($alltorrent);

$hash=sha1(BEncode($array["info"]));
echo "<b>MAGNET :</b> magnet:?xt=urn:btih:".$hash."<br />";
echo "<b>ANNOUNCE :</b> ".$array[announce]."<br />";
echo "<b>ANNOUNCE-LIST :</b> ";
$announce_list = "announce-list";
$announce_list_cnt = count($array[$announce_list]);
for ($i=0;$i < $announce_list_cnt;$i++) {
	echo $array[$announce_list][$i][0];
	if ($i < $announce_list_cnt-1)
		echo ", ";
	else 
		echo "<br />";
}

echo "<b>COMMENT :</b> ".$array[comment]."<br />";
$creation_date = "creation date";
echo "<b>CREATION DATE :</b> ".date("Y-m-d",$array[$creation_date])."<br />";
echo "<b>NAME :</b> ".$array[info][name]."<br />";
$file_cnt = 0;
$info_files_cnt = count($array[info][files]);
for ($i=0;$i < $info_files_cnt;$i++) {
	$info_file_path_cnt = count($array[info][files][$i][path]);
	$file_cnt++;
	echo $file_cnt.": ";
	for ($j=0;$j < $info_file_path_cnt;$j++) {
		echo $array[info][files][$i][path][$j];
		if ($j < $info_file_path_cnt-1) echo "/";
		echo " (".$array[info][files][$i][length]."byte)";
	}
	echo "<br />";
}


/*
 아래 소켓방식으로 파일 가저오기는 유창화 님의 소스 입니다.
 */
//변수가 정의 되었으면 해당 값을 반환하고 정의 되어있지 않으면 지정된 기본값을 반환합니다.
function Yvar_check(&$var, $return=''){
		return (isset($var)) ? $var : $return;
}

//변수가 정의되지 않았거나 값이 NULL값 이거나, 값이 0, false 일경우 지정된 기본값을 반환합니다.
function Yvar_empty_check(&$var, $return=''){
		return (!empty($var)) ? $var : $return;
}

//http, GET 방식의 소켓연결
function Ysockopen($url, $referer='', $accept='*/*', $contenttype='application/x-www-form-urlencoded', $cachecontrol='private', $pragma='no-cache', $connection='close'){
		if (!empty($url) && preg_match("`^http://.+`i", $url)) {

				$array = parse_url($url);
				$url_scheme = Yvar_check($array['scheme']);
				$url_server = Yvar_check($array['host']);
				$url_path = Yvar_check($array['path']);
				$url_query= Yvar_check($array['query']);
				$url_port = Yvar_empty_check($array['port'], 80);
	
				$fp = @fsockopen($url_server, $url_port);

		    if (empty($fp)) {
						return '';
		    }

				fputs($fp, "GET " . $url_path . "?" . $url_query . " HTTP/1.0\n");
				if (!empty($accept)) fputs($fp, "Accept: " . $accept . "\n");
				if (!empty($contenttype)) fputs($fp, "Content-Type: " . $contenttype . "\n");
				fputs($fp, "Host: $url_server:$url_port\n");
				if (!empty($referer)) fputs($fp, "Referer: " . $referer . "\n");
				if (!empty($cachecontrol)) fputs($fp, "Cache-control: " . $cachecontrol . "\n");
				if (!empty($pragma)) fputs($fp, "Pragma: " . $pragma . "\n");
				if (!empty($connection)) fputs($fp, "Connection: " . $connection . "\n\n");

				return $fp;
		} else {
				return '';
		}
}

function Ysockclose(&$fp){
		if (!empty($fp)) fclose($fp);
		return true;
}

//소켓으로 외부파일 통째로 텍스트로 읽어옴
function Yreadfile($url, $referer='', $accept='*/*', $contenttype='application/x-www-form-urlencoded', $cachecontrol='private', $pragma='no-cache', $connection='close') {
		$fp = Ysockopen($url, $referer, $accept, $contenttype, $cachecontrol, $pragma, $connection);
		if (!empty($fp)) {
				$text = '';
				$check_header = false;
				while (!feof($fp)){
						$temp = fgets($fp, 1024);
						if ($check_header == false){
								//실제 파일이 아닌 헤더 정보인지 체크 하여 추가하지 않는다.
								if (preg_match("'^(\r)?\n$'", $temp)) {
										$check_header = true;
										continue;
								}
						} else{
								//헤더 정보가 아닌 경우에만 추가한다.
								$text .= $temp;
						}
				}
				Ysockclose($fp);
				return $text;
		} else {
			return '';
		}
}

?>