php读取torrent种子文件内容的方法(测试可用)
本文实例讲述了php读取torrent种子文件内容的方法。分享给大家供大家参考，具体如下：
<?php
/**
*ClassxBEncoder
*Author:Angus.Fenying
*Version:0.1
*Date:2014-06-03
*
*ThisclasshelpsstringifyorparseBENC
*codes.
*
*AllCopyrights2007-2014FenyingStudioReserved.
*/
classxBEncoder
{
constREADY=0;
constREAD_STR=1;
constREAD_DICT=2;
constREAD_LIST=3;
constREAD_INT=4;
constREAD_KEY=5;
public$y;
protected$z,$m,$n;
protected$stat;
protected$stack;
/**
*Thismethodsavesthestatusofcurrent
*encode/decodework.
*/
protectedfunctionpush($newY,$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);
}
/**
*Thismethodrestorethesavedstatusofcurrent
*encode/decodework.
*/
protectedfunctionpop()
{
$t=array_pop($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;
}
}
/**
*Thismethodinitializesthestatusofwork.
*YOUSHOULDCALLTHISMETHODBEFOREEVERYTHING.
*/
publicfunctioninit()
{
$this->stat=self::READY;
$this->stack=array();
$this->z=$this->m=$this->n=0;
}
/**
*Thismethoddecode$s($laslength).
*Youcanget$obj->yastheresult.
*/
publicfunctiondecode($s,$l)
{
$this->y=0;
for($i=0;$i<$l;++$i){
switch($this->stat){
caseself::READY:
if($s[$i]=='d'){
$this->y=newxBDict();
$this->stat=self::READ_DICT;
}elseif($s[$i]=='l'){
$this->y=array();
$this->stat=self::READ_LIST;
}
break;
caseself::READ_INT:
if($s[$i]=='e'){
$this->y->val=substr($s,$this->m,$i-$this->m);
$this->pop();
}
break;
caseself::READ_STR:
if(xBInt::isNum($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;
$this->pop();
}
break;
caseself::READ_KEY:
if(xBInt::isNum($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;
$this->stat=self::READ_DICT;
}
break;
caseself::READ_DICT:
if($s[$i]=='e'){
$this->pop();
break;
}elseif(!$this->z){
$this->m=$i;
$this->stat=self::READ_KEY;
break;
}
caseself::READ_LIST:
switch($s[$i]){
case'e':
$this->pop();
break;
case'd':
$this->push(newxBDict(),self::READ_DICT);
break;
case'i':
$this->push(newxBInt(),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;
}
/**
*Thismethodencode$obj->yintoBEncode.
*/
publicfunctionencode()
{
return$this->_encDo($this->y);
}
protectedfunction_encStr($str)
{
returnstrlen($str).':'.$str;
}
protectedfunction_encDo($o)
{
if(is_string($o))
return$this->_encStr($o);
if($oinstanceofxBInt)
return'i'.$o->val.'e';
if($oinstanceofxBDict){
$r='d';
foreach($oas$k=>$c)
$r.=$this->_encStr($k).$this->_encDo($c);
return$r.'e';
}
if(is_array($o)){
$r='l';
foreach($oas$c)
$r.=$this->_encDo($c);
return$r.'e';
}
}
}
classxBDict
{
}
classxBInt
{
public$val;
publicfunction__construct($val=0)
{
$this->val=$val;
}
publicstaticfunctionisNum($chr)
{
$chr=ord($chr);
if($chr<=57&&$chr>=48)
returntrue;
returnfalse;
}
}
//使用实例
$s=file_get_contents("test.torrent");
$bc=newxBEncoder();
$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》
希望本文所述对大家PHP程序设计有所帮助。