PHP编程:php读取torrent种子文件内容的方法(测试可用)

开发技术 作者: 2024-07-21 01:15:01
介绍《PHP编程:php读取torrent种子文件内容的方法(测试可用)》开发教程,希望对您有用。

《PHP读取torrent种子文件内容的方法(测试可用)》要点:
本文介绍了PHP读取torrent种子文件内容的方法(测试可用),希望对您有用。如果有疑问,可以联系我们。

本文实例讲述了PHP读取torrent种子文件内容的办法.分享给大家供大家参考,具体如下:PHP编程

<?PHP
/**
 * Class xBEncoder
 * Author: Angus.Fenying
 * Version: 0.1
 * Date:  2014-06-03
 *
 *  This class helps stringify or 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 $stack;
  /**
   * This method saves the status of current
   * encode/decode work.
   */
  protected function push($newY,$newStat)
  {
    array_push($this->stack,array($this->y,$this->z,$this->m,$this->n,$this->stat));
    list($this->y,$this->stat) = array($newY,$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->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,$i - $this->m);
            $this->pop();
          }
          break;
        case self::READ_STR:
          if (xBInt::isNum($s[$i]))
            continue;
          if ($s[$i] = ':') {
            $this->z = substr($s,$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,$i - $this->m);
            $this->z = substr($s,$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 <= 57 && $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);

更多关于PHP相关内容感兴趣的读者可查看本站专题:《PHP数组(Array)操作技巧大全》、《PHP数学运算技巧总结》、《PHP图形与图片操作技巧汇总》、《php操作office文档技巧总结(包括word,excel,access,ppt)》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》PHP编程

希望本文所述对大家PHP程序设计有所赞助.PHP编程

《PHP读取torrent种子文件内容的方法(测试可用)》是否对您有启发,欢迎查看更多与《PHP读取torrent种子文件内容的方法(测试可用)》相关教程,学精学透。编程之家 jb51.cc为您提供精彩教程。

原创声明
本站部分文章基于互联网的整理,我们会把真正“有用/优质”的文章整理提供给各位开发者。本文来自互联网用户投稿,该文观点仅代表作者本人,不代表本站立场。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。
本文链接:http://www.jiecseo.com/news/show_47962.html