PHP read torrent Seed file content method test available

This article describes how PHP reads the contents of a torrent seed file. Share to everyone for your reference, as follows:

<?php/** * Class Xbencoder * Author:Angus.Fenying * version:0.1 * date:2014-06-03 * * This Class helps stringify o R Parse Benc * codes. * * All copyrights 2007-2014 fenying Studio Reserved.  */class xbencoder{Const READY = 0;  Const READ_STR = 1;  Const READ_DICT = 2;  Const READ_LIST = 3;  Const READ_INT = 4;  Const READ_KEY = 5;  Public $y;  Protected $z, $m, $n;  protected $stat;  protected $stack;   /** * This method saves the status of the current * Encode/decode work. */protected function push ($newY, $newStat) {Array_push ($this->stack, Array ($this->y, $this->z, $this->m    , $this->n, $this->stat));  List ($this->y, $this->z, $this->m, $this->n, $this->stat) = Array ($newY, 0, 0, 0, $newStat);   }/** * This method to restore the saved status of the current * Encode/decode work.    */protected function pop () {$t = Array_pop ($this->stack); if ($t) {if ($t [4] = = self::read_dict) {$t [0]->{$t [1]} = $this->y;      $t [1] = 0;      } elseif ($t [4] = = self::read_list) $t [0][] = $this->y;    List ($this->y, $this->z, $this->m, $this->n, $this->stat) = $t;   }}/** * This method initializes the status of work.   * You should call this METHOD before everything.    */Public Function init () {$this->stat = Self::ready;    $this->stack = Array ();  $this->z = $this->m = $this->n = 0;   }/** * This method decode $s ($l as length).   * You can get $obj->y as the result.    */Public function decode ($s, $l) {$this->y = 0;            for ($i = 0; $i < $l; + + $i) {switch ($this->stat) {case self::ready:if ($s [$i] = = ' d ') {            $this->y = new Xbdict ();          $this->stat = self::read_dict;            } elseif ($s [$i] = = ' L ') {$this->y = array ();          $this->stat = self::read_list;        } break; Case Self::read_int:if ($s [$i] = = ' E ') {$tHis->y->val = substr ($s, $this->m, $i-$this->m);          $this->pop ();        } break;          Case Self::read_str:if (Xbint::isnum ($s [$i])) continue;            if ($s [$i] = ': ') {$this->z = substr ($s, $this->m, $i-$this->m);            $this->y = substr ($s, $i + 1, $this->z + 0);            $i + = $this->z;          $this->pop ();        } break;          Case Self::read_key:if (Xbint::isnum ($s [$i])) continue;            if ($s [$i] = ': ') {$this->n = substr ($s, $this->m, $i-$this->m);            $this->z = substr ($s, $i + 1, $this->n + 0);            $i + = $this->n;          $this->stat = self::read_dict;        } break;            Case Self::read_dict:if ($s [$i] = = ' E ') {$this->pop ();          Break            } elseif (! $this->z) {$this->m = $i; $this->stat = Self::read_kEY;          Break              } Case Self::read_list:switch ($s [$i]) {case ' E ': $this->pop ();            Break              Case ' d ': $this->push (New Xbdict (), self::read_dict);            Break              Case ' I ': $this->push (New Xbint (), self::read_int);              $this->m = $i + 1;            Break              Case ' l ': $this->push (Array (), self::read_list);            Break                Default:if (Xbint::isnum ($s [$i]) {$this->push (", self::read_str);              $this->m = $i;      }} break;    }} $rtn = Empty ($this->stack);    $this->init ();  return $RTN;   }/** * This method encode the $obj->y into Bencode.  */Public Function encode () {return $this->_encdo ($this->y); } protected function _encstr ($STR) {return strlen ($STR). ':' .  $STR; } protected function _encdo ($O) {if (is_string ($o)) return $this->_encstr ($o); if ($o instanceof xbint) return ' I '. $o->val.    ' E ';      if ($o instanceof xbdict) {$r = ' d '; foreach ($o as $k = = $c) $r. = $this->_encstr ($k).      $this->_encdo ($c); Return $r.    ' E ';      } if (Is_array ($o)) {$r = ' l ';      foreach ($o as $c) $r. = $this->_encdo ($c); Return $r.    ' E ';  }}}class xbdict{}class xbint{public $val;  Public function __construct ($val = 0) {$this->val = $val;    public static function Isnum ($CHR) {$chr = ord ($CHR);    if ($chr <= && $chr >=) return true;  return false; }}//Use instance $s = file_get_contents ("test.torrent"); $BC = new Xbencoder (); $bc->init (); $BC->decode ($s, strlen ($s)); Var_dump ($BC->y);

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