C# 解析种子文件(bt文件)

原文地址：http://blog.csdn.net/love_beibei/article/details/7460565

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1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Text;  
5. using System.Collections;  
6.   
7. namespace XunleiHelper  
8. {  
9.     public class Torrent  
10.     {  
11.         #region 私有字段  
12.           
13.         private string _openError = "";  
14.         private bool _openFile = false;  
15.   
16.         private string _announce = "";  
17.         private IList<string> _announceList = new List<string>();  
18.         private DateTime _createTime = new DateTime(1970, 1, 1, 0, 0, 0);  
19.         private long _codePage = 0;  
20.         private string _comment = "";  
21.         private string _createdBy = "";  
22.         private string _encoding = "";  
23.         private string _commentUTF8 = "";  
24.         private IList<FileInfo> _fileList = new List<FileInfo>();  
25.         private string _name = "";  
26.         private string _nameUTF8 = "";  
27.         private long _pieceLength = 0;  
28.         private byte[] _pieces;  
29.         private string _publisher = "";  
30.         private string _publisherUTF8 = "";  
31.         private string _publisherUrl = "";  
32.         private string _publisherUrlUTF8 = "";  
33.         private IList<string> _notes = new List<string>();  
34.         private long _totalLength;  
35.  
36.         #endregion  
37.  
38.         #region 属性  
39.           
40.         /// <summary>  
41.         /// 错误信息  
42.         /// </summary>  
43.         public string OpenError { set { _openError = value; } get { return _openError; } }  
44.           
45.         /// <summary>  
46.         /// 是否正常打开文件  
47.         /// </summary>  
48.         public bool OpenFile { set { _openFile = value; } get { return _openFile; } }  
49.           
50.         /// <summary>  
51.         /// 服务器的URL(字符串)  
52.         /// </summary>  
53.         public string Announce { set { _announce = value; } get { return _announce; } }  
54.           
55.         /// <summary>  
56.         /// 备用tracker服务器列表(列表)  
57.         /// </summary>  
58.         public IList<string> AnnounceList { set { _announceList = value; } get { return _announceList; } }  
59.           
60.         /// <summary>  
61.         /// 种子创建的时间，Unix标准时间格式，从1970 1月1日 00:00:00到创建时间的秒数(整数)  
62.         /// </summary>  
63.         public DateTime CreateTime { set { _createTime = value; } get { return _createTime; } }  
64.           
65.         /// <summary>  
66.         /// 未知数字CodePage  
67.         /// </summary>  
68.         public long CodePage { set { _codePage = value; } get { return _codePage; } }  
69.           
70.         /// <summary>  
71.         /// 种子描述  
72.         /// </summary>  
73.         public string Comment { set { _comment = value; } get { return _comment; } }  
74.           
75.         /// <summary>  
76.         /// 编码方式  
77.         /// </summary>  
78.         public string CommentUTF8 { set { _commentUTF8 = value; } get { return _commentUTF8; } }  
79.           
80.         /// <summary>  
81.         /// 创建人  
82.         /// </summary>  
83.         public string CreatedBy { set { _createdBy = value; } get { return _createdBy; } }  
84.           
85.         /// <summary>  
86.         /// 编码方式  
87.         /// </summary>  
88.         public string Encoding { set { _encoding = value; } get { return _encoding; } }  
89.         /// <summary>  
90.         /// 文件信息  
91.         /// </summary>  
92.         public IList<FileInfo> FileList { set { _fileList = value; } get { return _fileList; } }  
93.           
94.         /// <summary>  
95.         /// 种子名  
96.         /// </summary>  
97.         public string Name { set { _name = value; } get { return _name; } }  
98.         /// <summary>  
99.         /// 种子名UTF8  
100.         /// </summary>  
101.         public string NameUTF8 { set { _nameUTF8 = value; } get { return _nameUTF8; } }  
102.           
103.         /// <summary>  
104.         /// 每个块的大小，单位字节(整数)  
105.         /// </summary>  
106.         public long PieceLength { set { _pieceLength = value; } get { return _pieceLength; } }  
107.           
108.         /// <summary>  
109.         /// 每个块的20个字节的SHA1 Hash的值(二进制格式)  
110.         /// </summary>  
111.         private byte[] Pieces { set { _pieces = value; } get { return _pieces; } }  
112.           
113.         /// <summary>  
114.         /// 出版  
115.         /// </summary>  
116.         public string Publisher { set { _publisher = value; } get { return _publisher; } }  
117.           
118.         /// <summary>  
119.         /// 出版UTF8  
120.         /// </summary>  
121.         public string PublisherUTF8 { set { _publisherUTF8 = value; } get { return _publisherUTF8; } }  
122.           
123.         /// <summary>  
124.         /// 出版地址  
125.         /// </summary>  
126.         public string PublisherUrl { set { _publisherUrl = value; } get { return _publisherUrl; } }  
127.       
128.         /// <summary>  
129.         /// 出版地址  
130.         /// </summary>  
131.         public string PublisherUrlUTF8 { set { _publisherUrlUTF8 = value; } get { return _publisherUrlUTF8; } }  
132.           
133.         /// <summary>  
134.         /// NODES  
135.         /// </summary>  
136.         public IList<string> Notes { set { _notes = value; } get { return _notes; } }  
137.   
138.         /// <summary>  
139.         /// 包含文件的总长度  
140.         /// </summary>  
141.         public long TotalLength  
142.         {  
143.             get  
144.             {  
145.                 return _totalLength;  
146.             }  
147.         }  
148.  
149.         #endregion  
150.   
151.         public Torrent(string fileName)  
152.         {  
153.             System.IO.FileStream torrentFile = new System.IO.FileStream(fileName, System.IO.FileMode.Open);  
154.             byte[] buffer = new byte[torrentFile.Length];  
155.             torrentFile.Read(buffer, 0, buffer.Length);  
156.             torrentFile.Close();  
157.   
158.             if ((char)buffer[0] != 'd')  
159.             {  
160.                 if (OpenError.Length == 0) OpenError = "错误的Torrent文件，开头第1字节不是100";  
161.                 return;  
162.             }  
163.             GetTorrentData(buffer);  
164.         }  
165.  
166.         #region 开始读数据  
167.   
168.         /// <summary>  
169.         /// 开始读取  
170.         /// </summary>  
171.         /// <param name="buffer"></param>  
172.         private void GetTorrentData(byte[] buffer)  
173.         {  
174.             int startIndex = 1;  
175.             while (true)  
176.             {  
177.                 object Keys = GetKeyText(buffer, ref startIndex);  
178.                 if (Keys == null)  
179.                 {  
180.                     if (startIndex >= buffer.Length) OpenFile = true;  
181.                     break;  
182.                 }  
183.   
184.                 if (GetValueText(buffer, ref startIndex, Keys.ToString().ToUpper()) == false) break;  
185.             }  
186.         }  
187.  
188.         #endregion  
189.   
190.         /// <summary>  
191.         /// 读取结构  
192.         /// </summary>  
193.         /// <param name="buffer"></param>  
194.         /// <param name="starIndex"></param>  
195.         /// <param name="key"></param>  
196.         /// <returns></returns>  
197.         private bool GetValueText(byte[] buffer, ref int starIndex, string key)  
198.         {  
199.             switch (key)  
200.             {  
201.                 case "ANNOUNCE":  
202.                     Announce = GetKeyText(buffer, ref starIndex).ToString();  
203.                     break;  
204.                 case "ANNOUNCE-LIST":  
205.                     int listCount = 0;  
206.                     ArrayList _tempList = GetKeyData(buffer, ref starIndex, ref listCount);  
207.                     for (int i = 0; i != _tempList.Count; i++)  
208.                     {  
209.                         AnnounceList.Add(_tempList[i].ToString());  
210.                     }  
211.                     break;  
212.                 case "CREATION DATE":  
213.                     object date = GetKeyNumb(buffer, ref starIndex).ToString();  
214.                     if (date == null)  
215.                     {  
216.                         if (OpenError.Length == 0) OpenError = "CREATION DATE 返回不是数字类型";  
217.                         return false;  
218.                     }  
219.                     CreateTime = CreateTime.AddTicks(long.Parse(date.ToString()));  
220.                     break;  
221.                 case "CODEPAGE":  
222.                     object codePageNumb = GetKeyNumb(buffer, ref starIndex);  
223.                     if (codePageNumb == null)  
224.                     {  
225.                         if (OpenError.Length == 0) OpenError = "CODEPAGE 返回不是数字类型";  
226.                         return false;  
227.                     }  
228.                     CodePage = long.Parse(codePageNumb.ToString());  
229.                     break;  
230.                 case "ENCODING":  
231.                     Encoding = GetKeyText(buffer, ref starIndex).ToString();  
232.                     break;  
233.                 case "CREATED BY":  
234.                     CreatedBy = GetKeyText(buffer, ref starIndex).ToString();  
235.                     break;  
236.                 case "COMMENT":  
237.                     Comment = GetKeyText(buffer, ref starIndex).ToString();  
238.                     break;  
239.                 case "COMMENT.UTF-8":  
240.                     CommentUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
241.                     break;  
242.                 case "INFO":  
243.                     int fileListCount = 0;  
244.                     GetFileInfo(buffer, ref starIndex, ref fileListCount);  
245.                     break;  
246.                 case "NAME":  
247.                     Name = GetKeyText(buffer, ref starIndex).ToString();  
248.                     break;  
249.                 case "NAME.UTF-8":  
250.                     NameUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
251.                     break;  
252.                 case "PIECE LENGTH":  
253.                     object pieceLengthNumb = GetKeyNumb(buffer, ref starIndex);  
254.                     if (pieceLengthNumb == null)  
255.                     {  
256.                         if (OpenError.Length == 0) OpenError = "PIECE LENGTH 返回不是数字类型";  
257.                         return false;  
258.                     }  
259.                     PieceLength = long.Parse(pieceLengthNumb.ToString());  
260.                     break;  
261.                 case "PIECES":  
262.                     Pieces = GetKeyByte(buffer, ref starIndex);  
263.                     break;  
264.                 case "PUBLISHER":  
265.                     Publisher = GetKeyText(buffer, ref starIndex).ToString();  
266.                     break;  
267.                 case "PUBLISHER.UTF-8":  
268.                     PublisherUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
269.                     break;  
270.                 case "PUBLISHER-URL":  
271.                     PublisherUrl = GetKeyText(buffer, ref starIndex).ToString();  
272.                     break;  
273.                 case "PUBLISHER-URL.UTF-8":  
274.                     PublisherUrlUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
275.                     break;  
276.                 case "NODES":  
277.                     int nodesCount = 0;  
278.                     ArrayList _nodesList = GetKeyData(buffer, ref starIndex, ref nodesCount);  
279.                     int ipCount = _nodesList.Count / 2;  
280.                     for (int i = 0; i != ipCount; i++)  
281.                     {  
282.                         Notes.Add(_nodesList[i * 2] + ":" + _nodesList[(i * 2) + 1]);  
283.                     }  
284.                     break;  
285.   
286.                 default:  
287.                     return false;  
288.             }  
289.             return true;  
290.         }  
291.  
292.         #region 获取数据  
293.           
294.         /// <summary>  
295.         /// 获取列表方式 "I1:Xe"="X" 会调用GetKeyText  
296.         /// </summary>  
297.         /// <param name="buffer"></param>  
298.         /// <param name="starIndex"></param>  
299.         /// <param name="listCount"></param>  
300.         private ArrayList GetKeyData(byte[] buffer, ref int starIndex, ref int listCount)  
301.         {  
302.             ArrayList _tempList = new ArrayList();  
303.             while (true)  
304.             {  
305.                 string textStar = System.Text.Encoding.UTF8.GetString(buffer, starIndex, 1);  
306.                 switch (textStar)  
307.                 {  
308.                     case "l":  
309.                         starIndex++;  
310.                         listCount++;  
311.                         break;  
312.                     case "e":  
313.                         listCount--;  
314.                         starIndex++;  
315.                         if (listCount == 0) return _tempList;  
316.                         break;  
317.                     case "i":  
318.                         _tempList.Add(GetKeyNumb(buffer, ref starIndex).ToString());  
319.                         break;  
320.                     default:  
321.                         object listText = GetKeyText(buffer, ref starIndex);  
322.                         if (listText != null)  
323.                         {  
324.                             _tempList.Add(listText.ToString());  
325.                         }  
326.                         else  
327.                         {  
328.                             if (OpenError.Length == 0)  
329.                             {  
330.                                 OpenError = "错误的Torrent文件，ANNOUNCE-LIST错误";  
331.                                 return _tempList;  
332.                             }  
333.                         }  
334.                         break;  
335.                 }  
336.             }  
337.         }  
338.           
339.         /// <summary>  
340.         /// 获取字符串  
341.         /// </summary>  
342.         /// <param name="buffer"></param>  
343.         /// <param name="startIndex"></param>  
344.         /// <returns></returns>  
345.         private object GetKeyText(byte[] buffer, ref int startIndex)  
346.         {  
347.             int numb = 0;  
348.             int leftNumb = 0;  
349.             for (int i = startIndex; i != buffer.Length; i++)  
350.             {  
351.                 if ((char)buffer[i] == ':') break;  
352.                 if ((char)buffer[i] == 'e')  
353.                 {  
354.                     leftNumb++;  
355.                     continue;  
356.                 }  
357.                 numb++;  
358.             }  
359.   
360.             startIndex += leftNumb;  
361.             string textNumb = System.Text.Encoding.UTF8.GetString(buffer, startIndex, numb);  
362.             try  
363.             {  
364.                 int readNumb = Int32.Parse(textNumb);  
365.                 startIndex = startIndex + numb + 1;  
366.                 object keyText = System.Text.Encoding.UTF8.GetString(buffer, startIndex, readNumb);  
367.                 startIndex += readNumb;  
368.                 return keyText;  
369.             }  
370.             catch  
371.             {  
372.                 return null;  
373.             }  
374.   
375.         }  
376.   
377.         /// <summary>  
378.         /// 获取数字  
379.         /// </summary>  
380.         /// <param name="buffer"></param>  
381.         /// <param name="startIndex"></param>  
382.         private object GetKeyNumb(byte[] buffer, ref int startIndex)  
383.         {  
384.             if (System.Text.Encoding.UTF8.GetString(buffer, startIndex, 1) == "i")  
385.             {  
386.                 int numb = 0;  
387.                 for (int i = startIndex; i != buffer.Length; i++)  
388.                 {  
389.                     if ((char)buffer[i] == 'e') break;  
390.                     numb++;  
391.                 }  
392.                 startIndex++;  
393.                 long retNumb = 0;  
394.                 try  
395.                 {  
396.                     retNumb = long.Parse(System.Text.Encoding.UTF8.GetString(buffer, startIndex, numb - 1));  
397.                     startIndex += numb;  
398.                     return retNumb;  
399.                 }  
400.                 catch  
401.                 {  
402.                     return null;  
403.                 }  
404.             }  
405.             else  
406.             {  
407.                 return null;  
408.             }  
409.   
410.         }  
411.   
412.         /// <summary>  
413.         /// 获取BYTE数据  
414.         /// </summary>  
415.         /// <param name="buffer"></param>  
416.         /// <param name="startIndex"></param>  
417.         /// <returns></returns>  
418.         private byte[] GetKeyByte(byte[] buffer, ref int startIndex)  
419.         {  
420.             int numb = 0;  
421.             for (int i = startIndex; i != buffer.Length; i++)  
422.             {  
423.                 if ((char)buffer[i] == ':') break;  
424.                 numb++;  
425.             }  
426.             string textNumb = System.Text.Encoding.UTF8.GetString(buffer, startIndex, numb);  
427.   
428.             try  
429.             {  
430.                 int readNumb = Int32.Parse(textNumb);  
431.                 startIndex = startIndex + numb + 1;  
432.                 System.IO.MemoryStream keyMemory = new System.IO.MemoryStream(buffer, startIndex, readNumb);  
433.                 byte[] keyBytes = new byte[readNumb];  
434.                 keyMemory.Read(keyBytes, 0, readNumb);  
435.                 keyMemory.Close();  
436.                 startIndex += readNumb;  
437.                 return keyBytes;  
438.             }  
439.             catch  
440.             {  
441.                 return null;  
442.             }  
443.         }  
444.   
445.         /// <summary>  
446.         /// 对付INFO的结构  
447.         /// </summary>  
448.         /// <param name="buffer"></param>  
449.         /// <param name="startIndex"></param>  
450.         /// <param name="listCount"></param>  
451.         private void GetFileInfo(byte[] buffer, ref int startIndex, ref int listCount)  
452.         {  
453.             if ((char)buffer[startIndex] != 'd') return;  
454.             startIndex++;  
455.   
456.             if (GetKeyText(buffer, ref startIndex).ToString().ToUpper() == "FILES")  
457.             {  
458.                 FileInfo info = new FileInfo();  
459.   
460.                 while (true)  
461.                 {  
462.                     string TextStar = System.Text.Encoding.UTF8.GetString(buffer, startIndex, 1);  
463.   
464.                     switch (TextStar)  
465.                     {  
466.                         case "l":  
467.                             startIndex++;  
468.                             listCount++;  
469.                             break;  
470.                         case "e":  
471.                             listCount--;  
472.                             startIndex++;  
473.                             if (listCount == 1) FileList.Add(info);  
474.                             if (listCount == 0) return;  
475.                             break;  
476.                         case "d":  
477.                             info = new FileInfo();  
478.                             listCount++;  
479.                             startIndex++;  
480.                             break;  
481.   
482.                         default:  
483.                             object listText = GetKeyText(buffer, ref startIndex);  
484.                             if (listText == null) return;  
485.                             switch (listText.ToString().ToUpper())   //转换为大写  
486.                             {  
487.                                 case "ED2K":  
488.                                     info.De2K = GetKeyText(buffer, ref startIndex).ToString();  
489.                                     break;  
490.                                 case "FILEHASH":  
491.                                     info.FileHash = GetKeyText(buffer, ref startIndex).ToString();  
492.                                     break;  
493.   
494.                                 case "LENGTH":  
495.                                     info.Length = Convert.ToInt64(GetKeyNumb(buffer, ref startIndex));  
496.                                     _totalLength += info.Length;  
497.                                     break;  
498.                                 case "PATH":  
499.                                     int PathCount = 0;  
500.                                     ArrayList PathList = GetKeyData(buffer, ref startIndex, ref PathCount);  
501.                                     string Temp = "";  
502.                                     for (int i = 0; i != PathList.Count; i++)  
503.                                     {  
504.                                         if (i < PathList.Count && i != 0)  
505.                                             Temp += "\\";  
506.                                         Temp += PathList[i].ToString();  
507.                                     }  
508.                                     info.Path = Temp;  
509.                                     break;  
510.                                 case "PATH.UTF-8":  
511.                                     int pathUtf8Count = 0;  
512.                                     ArrayList pathutf8List = GetKeyData(buffer, ref startIndex, ref pathUtf8Count);  
513.                                     string utfTemp = "";  
514.                                     for (int i = 0; i != pathutf8List.Count; i++)  
515.                                     {  
516.                                         utfTemp += pathutf8List[i].ToString();  
517.                                     }  
518.                                     info.PathUTF8 = utfTemp;  
519.                                     break;  
520.                             }  
521.                             break;  
522.                     }  
523.   
524.                 }  
525.   
526.             }  
527.         }  
528.  
529.         #endregion  
530.   
531.         /// <summary>  
532.         /// 对应结构 INFO 多个文件时  
533.         /// </summary>  
534.         public class FileInfo  
535.         {  
536.             private string path = "";  
537.             private string pathutf8 = "";  
538.             private long length = 0;  
539.             private string md5sum = "";  
540.             private string de2k = "";  
541.             private string filehash = "";  
542.   
543.             /// <summary>  
544.             /// 文件路径  
545.             /// </summary>  
546.             public string Path { get { return path; } set { path = value; } }  
547.           
548.             /// <summary>  
549.             /// UTF8的名称  
550.             /// </summary>  
551.             public string PathUTF8 { get { return pathutf8; } set { pathutf8 = value; } }  
552.               
553.             /// <summary>  
554.             /// 文件大小  
555.             /// </summary>  
556.             public long Length { get { return length; } set { length = value; } }  
557.               
558.             /// <summary>  
559.             /// MD5验效 （可选）  
560.             /// </summary>  
561.             public string MD5Sum { get { return md5sum; } set { md5sum = value; } }  
562.               
563.             /// <summary>  
564.             /// ED2K 未知  
565.             /// </summary>  
566.             public string De2K { get { return de2k; } set { de2k = value; } }  
567.               
568.             /// <summary>  
569.             /// FileHash 未知  
570.             /// </summary>  
571.             public string FileHash { get { return filehash; } set { filehash = value; } }  
572.         }  
573.     }  
574. }  

[csharp] view plaincopyprint?

1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Text;  
5. using System.Collections;  
6.   
7. namespace XunleiHelper  
8. {  
9.     public class Torrent  
10.     {  
11.         #region 私有字段  
12.           
13.         private string _openError = "";  
14.         private bool _openFile = false;  
15.   
16.         private string _announce = "";  
17.         private IList<string> _announceList = new List<string>();  
18.         private DateTime _createTime = new DateTime(1970, 1, 1, 0, 0, 0);  
19.         private long _codePage = 0;  
20.         private string _comment = "";  
21.         private string _createdBy = "";  
22.         private string _encoding = "";  
23.         private string _commentUTF8 = "";  
24.         private IList<FileInfo> _fileList = new List<FileInfo>();  
25.         private string _name = "";  
26.         private string _nameUTF8 = "";  
27.         private long _pieceLength = 0;  
28.         private byte[] _pieces;  
29.         private string _publisher = "";  
30.         private string _publisherUTF8 = "";  
31.         private string _publisherUrl = "";  
32.         private string _publisherUrlUTF8 = "";  
33.         private IList<string> _notes = new List<string>();  
34.         private long _totalLength;  
35.  
36.         #endregion  
37.  
38.         #region 属性  
39.           
40.         /// <summary>  
41.         /// 错误信息  
42.         /// </summary>  
43.         public string OpenError { set { _openError = value; } get { return _openError; } }  
44.           
45.         /// <summary>  
46.         /// 是否正常打开文件  
47.         /// </summary>  
48.         public bool OpenFile { set { _openFile = value; } get { return _openFile; } }  
49.           
50.         /// <summary>  
51.         /// 服务器的URL(字符串)  
52.         /// </summary>  
53.         public string Announce { set { _announce = value; } get { return _announce; } }  
54.           
55.         /// <summary>  
56.         /// 备用tracker服务器列表(列表)  
57.         /// </summary>  
58.         public IList<string> AnnounceList { set { _announceList = value; } get { return _announceList; } }  
59.           
60.         /// <summary>  
61.         /// 种子创建的时间，Unix标准时间格式，从1970 1月1日 00:00:00到创建时间的秒数(整数)  
62.         /// </summary>  
63.         public DateTime CreateTime { set { _createTime = value; } get { return _createTime; } }  
64.           
65.         /// <summary>  
66.         /// 未知数字CodePage  
67.         /// </summary>  
68.         public long CodePage { set { _codePage = value; } get { return _codePage; } }  
69.           
70.         /// <summary>  
71.         /// 种子描述  
72.         /// </summary>  
73.         public string Comment { set { _comment = value; } get { return _comment; } }  
74.           
75.         /// <summary>  
76.         /// 编码方式  
77.         /// </summary>  
78.         public string CommentUTF8 { set { _commentUTF8 = value; } get { return _commentUTF8; } }  
79.           
80.         /// <summary>  
81.         /// 创建人  
82.         /// </summary>  
83.         public string CreatedBy { set { _createdBy = value; } get { return _createdBy; } }  
84.           
85.         /// <summary>  
86.         /// 编码方式  
87.         /// </summary>  
88.         public string Encoding { set { _encoding = value; } get { return _encoding; } }  
89.         /// <summary>  
90.         /// 文件信息  
91.         /// </summary>  
92.         public IList<FileInfo> FileList { set { _fileList = value; } get { return _fileList; } }  
93.           
94.         /// <summary>  
95.         /// 种子名  
96.         /// </summary>  
97.         public string Name { set { _name = value; } get { return _name; } }  
98.         /// <summary>  
99.         /// 种子名UTF8  
100.         /// </summary>  
101.         public string NameUTF8 { set { _nameUTF8 = value; } get { return _nameUTF8; } }  
102.           
103.         /// <summary>  
104.         /// 每个块的大小，单位字节(整数)  
105.         /// </summary>  
106.         public long PieceLength { set { _pieceLength = value; } get { return _pieceLength; } }  
107.           
108.         /// <summary>  
109.         /// 每个块的20个字节的SHA1 Hash的值(二进制格式)  
110.         /// </summary>  
111.         private byte[] Pieces { set { _pieces = value; } get { return _pieces; } }  
112.           
113.         /// <summary>  
114.         /// 出版  
115.         /// </summary>  
116.         public string Publisher { set { _publisher = value; } get { return _publisher; } }  
117.           
118.         /// <summary>  
119.         /// 出版UTF8  
120.         /// </summary>  
121.         public string PublisherUTF8 { set { _publisherUTF8 = value; } get { return _publisherUTF8; } }  
122.           
123.         /// <summary>  
124.         /// 出版地址  
125.         /// </summary>  
126.         public string PublisherUrl { set { _publisherUrl = value; } get { return _publisherUrl; } }  
127.       
128.         /// <summary>  
129.         /// 出版地址  
130.         /// </summary>  
131.         public string PublisherUrlUTF8 { set { _publisherUrlUTF8 = value; } get { return _publisherUrlUTF8; } }  
132.           
133.         /// <summary>  
134.         /// NODES  
135.         /// </summary>  
136.         public IList<string> Notes { set { _notes = value; } get { return _notes; } }  
137.   
138.         /// <summary>  
139.         /// 包含文件的总长度  
140.         /// </summary>  
141.         public long TotalLength  
142.         {  
143.             get  
144.             {  
145.                 return _totalLength;  
146.             }  
147.         }  
148.  
149.         #endregion  
150.   
151.         public Torrent(string fileName)  
152.         {  
153.             System.IO.FileStream torrentFile = new System.IO.FileStream(fileName, System.IO.FileMode.Open);  
154.             byte[] buffer = new byte[torrentFile.Length];  
155.             torrentFile.Read(buffer, 0, buffer.Length);  
156.             torrentFile.Close();  
157.   
158.             if ((char)buffer[0] != 'd')  
159.             {  
160.                 if (OpenError.Length == 0) OpenError = "错误的Torrent文件，开头第1字节不是100";  
161.                 return;  
162.             }  
163.             GetTorrentData(buffer);  
164.         }  
165.  
166.         #region 开始读数据  
167.   
168.         /// <summary>  
169.         /// 开始读取  
170.         /// </summary>  
171.         /// <param name="buffer"></param>  
172.         private void GetTorrentData(byte[] buffer)  
173.         {  
174.             int startIndex = 1;  
175.             while (true)  
176.             {  
177.                 object Keys = GetKeyText(buffer, ref startIndex);  
178.                 if (Keys == null)  
179.                 {  
180.                     if (startIndex >= buffer.Length) OpenFile = true;  
181.                     break;  
182.                 }  
183.   
184.                 if (GetValueText(buffer, ref startIndex, Keys.ToString().ToUpper()) == false) break;  
185.             }  
186.         }  
187.  
188.         #endregion  
189.   
190.         /// <summary>  
191.         /// 读取结构  
192.         /// </summary>  
193.         /// <param name="buffer"></param>  
194.         /// <param name="starIndex"></param>  
195.         /// <param name="key"></param>  
196.         /// <returns></returns>  
197.         private bool GetValueText(byte[] buffer, ref int starIndex, string key)  
198.         {  
199.             switch (key)  
200.             {  
201.                 case "ANNOUNCE":  
202.                     Announce = GetKeyText(buffer, ref starIndex).ToString();  
203.                     break;  
204.                 case "ANNOUNCE-LIST":  
205.                     int listCount = 0;  
206.                     ArrayList _tempList = GetKeyData(buffer, ref starIndex, ref listCount);  
207.                     for (int i = 0; i != _tempList.Count; i++)  
208.                     {  
209.                         AnnounceList.Add(_tempList[i].ToString());  
210.                     }  
211.                     break;  
212.                 case "CREATION DATE":  
213.                     object date = GetKeyNumb(buffer, ref starIndex).ToString();  
214.                     if (date == null)  
215.                     {  
216.                         if (OpenError.Length == 0) OpenError = "CREATION DATE 返回不是数字类型";  
217.                         return false;  
218.                     }  
219.                     CreateTime = CreateTime.AddTicks(long.Parse(date.ToString()));  
220.                     break;  
221.                 case "CODEPAGE":  
222.                     object codePageNumb = GetKeyNumb(buffer, ref starIndex);  
223.                     if (codePageNumb == null)  
224.                     {  
225.                         if (OpenError.Length == 0) OpenError = "CODEPAGE 返回不是数字类型";  
226.                         return false;  
227.                     }  
228.                     CodePage = long.Parse(codePageNumb.ToString());  
229.                     break;  
230.                 case "ENCODING":  
231.                     Encoding = GetKeyText(buffer, ref starIndex).ToString();  
232.                     break;  
233.                 case "CREATED BY":  
234.                     CreatedBy = GetKeyText(buffer, ref starIndex).ToString();  
235.                     break;  
236.                 case "COMMENT":  
237.                     Comment = GetKeyText(buffer, ref starIndex).ToString();  
238.                     break;  
239.                 case "COMMENT.UTF-8":  
240.                     CommentUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
241.                     break;  
242.                 case "INFO":  
243.                     int fileListCount = 0;  
244.                     GetFileInfo(buffer, ref starIndex, ref fileListCount);  
245.                     break;  
246.                 case "NAME":  
247.                     Name = GetKeyText(buffer, ref starIndex).ToString();  
248.                     break;  
249.                 case "NAME.UTF-8":  
250.                     NameUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
251.                     break;  
252.                 case "PIECE LENGTH":  
253.                     object pieceLengthNumb = GetKeyNumb(buffer, ref starIndex);  
254.                     if (pieceLengthNumb == null)  
255.                     {  
256.                         if (OpenError.Length == 0) OpenError = "PIECE LENGTH 返回不是数字类型";  
257.                         return false;  
258.                     }  
259.                     PieceLength = long.Parse(pieceLengthNumb.ToString());  
260.                     break;  
261.                 case "PIECES":  
262.                     Pieces = GetKeyByte(buffer, ref starIndex);  
263.                     break;  
264.                 case "PUBLISHER":  
265.                     Publisher = GetKeyText(buffer, ref starIndex).ToString();  
266.                     break;  
267.                 case "PUBLISHER.UTF-8":  
268.                     PublisherUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
269.                     break;  
270.                 case "PUBLISHER-URL":  
271.                     PublisherUrl = GetKeyText(buffer, ref starIndex).ToString();  
272.                     break;  
273.                 case "PUBLISHER-URL.UTF-8":  
274.                     PublisherUrlUTF8 = GetKeyText(buffer, ref starIndex).ToString();  
275.                     break;  
276.                 case "NODES":  
277.                     int nodesCount = 0;  
278.                     ArrayList _nodesList = GetKeyData(buffer, ref starIndex, ref nodesCount);  
279.                     int ipCount = _nodesList.Count / 2;  
280.                     for (int i = 0; i != ipCount; i++)  
281.                     {  
282.                         Notes.Add(_nodesList[i * 2] + ":" + _nodesList[(i * 2) + 1]);  
283.                     }  
284.                     break;  
285.   
286.                 default:  
287.                     return false;  
288.             }  
289.             return true;  
290.         }  
291.  
292.         #region 获取数据  
293.           
294.         /// <summary>  
295.         /// 获取列表方式 "I1:Xe"="X" 会调用GetKeyText  
296.         /// </summary>  
297.         /// <param name="buffer"></param>  
298.         /// <param name="starIndex"></param>  
299.         /// <param name="listCount"></param>  
300.         private ArrayList GetKeyData(byte[] buffer, ref int starIndex, ref int listCount)  
301.         {  
302.             ArrayList _tempList = new ArrayList();  
303.             while (true)  
304.             {  
305.                 string textStar = System.Text.Encoding.UTF8.GetString(buffer, starIndex, 1);  
306.                 switch (textStar)  
307.                 {  
308.                     case "l":  
309.                         starIndex++;  
310.                         listCount++;  
311.                         break;  
312.                     case "e":  
313.                         listCount--;  
314.                         starIndex++;  
315.                         if (listCount == 0) return _tempList;  
316.                         break;  
317.                     case "i":  
318.                         _tempList.Add(GetKeyNumb(buffer, ref starIndex).ToString());  
319.                         break;  
320.                     default:  
321.                         object listText = GetKeyText(buffer, ref starIndex);  
322.                         if (listText != null)  
323.                         {  
324.                             _tempList.Add(listText.ToString());  
325.                         }  
326.                         else  
327.                         {  
328.                             if (OpenError.Length == 0)  
329.                             {  
330.                                 OpenError = "错误的Torrent文件，ANNOUNCE-LIST错误";  
331.                                 return _tempList;  
332.                             }  
333.                         }  
334.                         break;  
335.                 }  
336.             }  
337.         }  
338.           
339.         /// <summary>  
340.         /// 获取字符串  
341.         /// </summary>  
342.         /// <param name="buffer"></param>  
343.         /// <param name="startIndex"></param>  
344.         /// <returns></returns>  
345.         private object GetKeyText(byte[] buffer, ref int startIndex)  
346.         {  
347.             int numb = 0;  
348.             int leftNumb = 0;  
349.             for (int i = startIndex; i != buffer.Length; i++)  
350.             {  
351.                 if ((char)buffer[i] == ':') break;  
352.                 if ((char)buffer[i] == 'e')  
353.                 {  
354.                     leftNumb++;  
355.                     continue;  
356.                 }  
357.                 numb++;  
358.             }  
359.   
360.             startIndex += leftNumb;  
361.             string textNumb = System.Text.Encoding.UTF8.GetString(buffer, startIndex, numb);  
362.             try  
363.             {  
364.                 int readNumb = Int32.Parse(textNumb);  
365.                 startIndex = startIndex + numb + 1;  
366.                 object keyText = System.Text.Encoding.UTF8.GetString(buffer, startIndex, readNumb);  
367.                 startIndex += readNumb;  
368.                 return keyText;  
369.             }  
370.             catch  
371.             {  
372.                 return null;  
373.             }  
374.   
375.         }  
376.   
377.         /// <summary>  
378.         /// 获取数字  
379.         /// </summary>  
380.         /// <param name="buffer"></param>  
381.         /// <param name="startIndex"></param>  
382.         private object GetKeyNumb(byte[] buffer, ref int startIndex)  
383.         {  
384.             if (System.Text.Encoding.UTF8.GetString(buffer, startIndex, 1) == "i")  
385.             {  
386.                 int numb = 0;  
387.                 for (int i = startIndex; i != buffer.Length; i++)  
388.                 {  
389.                     if ((char)buffer[i] == 'e') break;  
390.                     numb++;  
391.                 }  
392.                 startIndex++;  
393.                 long retNumb = 0;  
394.                 try  
395.                 {  
396.                     retNumb = long.Parse(System.Text.Encoding.UTF8.GetString(buffer, startIndex, numb - 1));  
397.                     startIndex += numb;  
398.                     return retNumb;  
399.                 }  
400.                 catch  
401.                 {  
402.                     return null;  
403.                 }  
404.             }  
405.             else  
406.             {  
407.                 return null;  
408.             }  
409.   
410.         }  
411.   
412.         /// <summary>  
413.         /// 获取BYTE数据  
414.         /// </summary>  
415.         /// <param name="buffer"></param>  
416.         /// <param name="startIndex"></param>  
417.         /// <returns></returns>  
418.         private byte[] GetKeyByte(byte[] buffer, ref int startIndex)  
419.         {  
420.             int numb = 0;  
421.             for (int i = startIndex; i != buffer.Length; i++)  
422.             {  
423.                 if ((char)buffer[i] == ':') break;  
424.                 numb++;  
425.             }  
426.             string textNumb = System.Text.Encoding.UTF8.GetString(buffer, startIndex, numb);  
427.   
428.             try  
429.             {  
430.                 int readNumb = Int32.Parse(textNumb);  
431.                 startIndex = startIndex + numb + 1;  
432.                 System.IO.MemoryStream keyMemory = new System.IO.MemoryStream(buffer, startIndex, readNumb);  
433.                 byte[] keyBytes = new byte[readNumb];  
434.                 keyMemory.Read(keyBytes, 0, readNumb);  
435.                 keyMemory.Close();  
436.                 startIndex += readNumb;  
437.                 return keyBytes;  
438.             }  
439.             catch  
440.             {  
441.                 return null;  
442.             }  
443.         }  
444.   
445.         /// <summary>  
446.         /// 对付INFO的结构  
447.         /// </summary>  
448.         /// <param name="buffer"></param>  
449.         /// <param name="startIndex"></param>  
450.         /// <param name="listCount"></param>  
451.         private void GetFileInfo(byte[] buffer, ref int startIndex, ref int listCount)  
452.         {  
453.             if ((char)buffer[startIndex] != 'd') return;  
454.             startIndex++;  
455.   
456.             if (GetKeyText(buffer, ref startIndex).ToString().ToUpper() == "FILES")  
457.             {  
458.                 FileInfo info = new FileInfo();  
459.   
460.                 while (true)  
461.                 {  
462.                     string TextStar = System.Text.Encoding.UTF8.GetString(buffer, startIndex, 1);  
463.   
464.                     switch (TextStar)  
465.                     {  
466.                         case "l":  
467.                             startIndex++;  
468.                             listCount++;  
469.                             break;  
470.                         case "e":  
471.                             listCount--;  
472.                             startIndex++;  
473.                             if (listCount == 1) FileList.Add(info);  
474.                             if (listCount == 0) return;  
475.                             break;  
476.                         case "d":  
477.                             info = new FileInfo();  
478.                             listCount++;  
479.                             startIndex++;  
480.                             break;  
481.   
482.                         default:  
483.                             object listText = GetKeyText(buffer, ref startIndex);  
484.                             if (listText == null) return;  
485.                             switch (listText.ToString().ToUpper())   //转换为大写  
486.                             {  
487.                                 case "ED2K":  
488.                                     info.De2K = GetKeyText(buffer, ref startIndex).ToString();  
489.                                     break;  
490.                                 case "FILEHASH":  
491.                                     info.FileHash = GetKeyText(buffer, ref startIndex).ToString();  
492.                                     break;  
493.   
494.                                 case "LENGTH":  
495.                                     info.Length = Convert.ToInt64(GetKeyNumb(buffer, ref startIndex));  
496.                                     _totalLength += info.Length;  
497.                                     break;  
498.                                 case "PATH":  
499.                                     int PathCount = 0;  
500.                                     ArrayList PathList = GetKeyData(buffer, ref startIndex, ref PathCount);  
501.                                     string Temp = "";  
502.                                     for (int i = 0; i != PathList.Count; i++)  
503.                                     {  
504.                                         if (i < PathList.Count && i != 0)  
505.                                             Temp += "\\";  
506.                                         Temp += PathList[i].ToString();  
507.                                     }  
508.                                     info.Path = Temp;  
509.                                     break;  
510.                                 case "PATH.UTF-8":  
511.                                     int pathUtf8Count = 0;  
512.                                     ArrayList pathutf8List = GetKeyData(buffer, ref startIndex, ref pathUtf8Count);  
513.                                     string utfTemp = "";  
514.                                     for (int i = 0; i != pathutf8List.Count; i++)  
515.                                     {  
516.                                         utfTemp += pathutf8List[i].ToString();  
517.                                     }  
518.                                     info.PathUTF8 = utfTemp;  
519.                                     break;  
520.                             }  
521.                             break;  
522.                     }  
523.   
524.                 }  
525.   
526.             }  
527.         }  
528.  
529.         #endregion  
530.   
531.         /// <summary>  
532.         /// 对应结构 INFO 多个文件时  
533.         /// </summary>  
534.         public class FileInfo  
535.         {  
536.             private string path = "";  
537.             private string pathutf8 = "";  
538.             private long length = 0;  
539.             private string md5sum = "";  
540.             private string de2k = "";  
541.             private string filehash = "";  
542.   
543.             /// <summary>  
544.             /// 文件路径  
545.             /// </summary>  
546.             public string Path { get { return path; } set { path = value; } }  
547.           
548.             /// <summary>  
549.             /// UTF8的名称  
550.             /// </summary>  
551.             public string PathUTF8 { get { return pathutf8; } set { pathutf8 = value; } }  
552.               
553.             /// <summary>  
554.             /// 文件大小  
555.             /// </summary>  
556.             public long Length { get { return length; } set { length = value; } }  
557.               
558.             /// <summary>  
559.             /// MD5验效 （可选）  
560.             /// </summary>  
561.             public string MD5Sum { get { return md5sum; } set { md5sum = value; } }  
562.               
563.             /// <summary>  
564.             /// ED2K 未知  
565.             /// </summary>  
566.             public string De2K { get { return de2k; } set { de2k = value; } }  
567.               
568.             /// <summary>  
569.             /// FileHash 未知  
570.             /// </summary>  
571.             public string FileHash { get { return filehash; } set { filehash = value; } }  
572.         }  
573.     }  
574. }