后端开发|php教程
php,读取,torrent,种子文件
后端开发-php教程
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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 restore the saved status of 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; $i stat) { case self::READY:if ($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 $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 ($chr = 48)return true; return false; }}//使用实例$s = file_get_contents("test.torrent");$bc = new xBEncoder();$bc->init();$bc->decode($s, strlen($s));var_dump($bc->y);
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