把种子放到PHP同目录,种子名是filename.torrent 访问即可。
test.phpinclude 'BEncode.php';
include 'BDecode.php';
$torrent_content = file_get_contents('filename.torrent');
$desc = BDecode($torrent_content);
$info = $desc['info'];
$hash = strtoupper(sha1( BEncode($info) ));
sprintf('magnet:?xt=urn:btih:%s&dn=%s', $hash, $info['name']);
BEncode.php
class BEncode {
// Dictionary keys must be sorted. foreach tends to iterate over the order
// the array was made, so we make a new one in sorted order.
function makeSorted($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);
}
$fd .= 'e';
}
}
function BEncode($array) {
$string = '';
$encoder = new BEncode;
$encoder->decideEncode($array, $string);
return $string;
}
BDecode.php
class BDecode {
function numberdecode($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') {
$ret[0] *= 10;
//Added .02.21 - VisiGod
//Changing the type of variable from integer to double to prevent a numeric overflow
settype($ret[0],'double');
//Added .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);
}
}
function BDecode($wholefile) {
$decoder = new BDecode;
$return = $decoder->decodeEntry($wholefile);
return $return[0];
}
en
