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我正在使用BEncoded PHP Library来解码来自 Bittorrent 跟踪器的 bencoded 响应。

Tracker 的响应是:

d5:filesd20:¼€™rÄ2ÞÊþVA  .]á^¦d8:completei285e10:downloadedi22911e10:incompletei9eeee

使用以下代码对其进行解码后:

require 'bencoded.php';

$be = new BEncoded;
//Response saved in scrape.txt
$data =file_get_contents('scrape.txt');
print_r($be->Decode($data));

输出是:

Array ( [files] => Array ( [¼€™rÄ2ÞÊþVA  .]á^¦] => Array ( [complete] => 285 [downloaded] => 22911 [incomplete] => 9 [isDct] => 1 ) [isDct] => 1 ) [isDct] => 1 )

我的问题 我在上述输出中的问题是如何解码输出中的那些神秘字母。

4

2 回答 2

11

user3690414 发布的链接:http : //wiki.vuze.com/w/Scrape 几乎解释了不同键的含义。

要解释原始的编码字符串:

d5:filesd20:¼€™rÄ2ÞÊþVA  .]á^¦d8:completei285e10:downloadedi22911e10:incompletei9eeee

您需要了解 Bencoding 的工作原理:https ://wiki.theory.org/BitTorrentSpecification#Bencoding

这里最重要的是,编码字典中的每个条目都是Key,Value对。
其中Key是一个字节字符串
,而Value是以下类型之一:字节字符串整数列表字典

考虑到这一点,原始字符串可以这样分解:

d               // The first d indicates the start of the Root dictionary
 5:files            // that has a Key with a 5 byte string name 'files',
  d                     // the value of the 'files'-key is a second dictionary
   20:¼€™rÄ2ÞÊþVA  .]á^¦    // that has a Key 20 byte = 160 bit big endian SHA1 info-hash
    d                       // the value of that key is a third dictionary
     8:complete                 // that has a Key with a 8 byte string name 'complete',
      i285e                         // the value of that key is a Integer=285
     10:downloaded              // that has a Key with a 10 byte string name 'downloaded',
      i22911e                       // the value of that key is a Integer=22911
     10:incomplete              // that has a Key with a 10 byte string name 'incomplete',
      i9e                           // the value of that key is a Integer=9
    e                       // this e indicates the end of the third dictionary
  e                     // this e indicates the end of the second dictionary
e               // this e indicates the end of the Root dictionary

希望这有助于理解“bencoded.php”的输出。

编辑。
如果您想使 160 位大端 SHA1 信息哈希 [¼€™rÄ2ÞÊþVA .]á^¦]
更具人类可读性,我建议您将其输出为 40 字节十六进制编码字符串:
0xBC801B9D9972C432DECAFE56410F092E5DE15EA6

于 2014-06-01T05:15:29.033 回答
2

如果您指的是files数组的损坏键,那么它是原始的 infohash - 查看规范:

于 2014-05-30T07:33:21.670 回答