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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