[C#] 토렌토 파일을 읽어 봅시다.

토렌토 파일은 bencode라는 넘으로 작성되어져 있습니다.

키 + 값길이 : 값 + 키 + 값길이 : 값 ....

이렇게 반복되는 형태의 코드입니다.

예제)  into4:aaaafile5:bbbbb

이넘을 파싱해서 우리가 필요한 정보들을 쏙쏙 뽑아 옵니다.

패키지 정보 : https://github.com/Krusen/BencodeNET

using BencodeNET; using BencodeNET.Objects; using neo365.IO; using System; using System.Collections.Generic; using System.IO; using System.Text; namespace neo365.Files { public class BencodeFile { public class BencodeSubFileinfo { public String FilePath { set; get; } public long FileSize { set; get; } public override string ToString() { return this.FilePath + " [" + FileSize.ToFileSize() + "]"; } } public String FilePath { private set; get; } public String HashKey { protected set; get; } public string Announce { protected set; get; } public BList AnnounceList { protected set; get; } public string Comment { protected set; get; } public string CreatedBy { protected set; get; } public DateTime? CreationDate { protected set; get; } public string Encoding { protected set; get; } public long Size { protected set; get; } public String FileSizeTxt { get { return this.Size.ToFileSize() + " (" + this.Size.ToString("N0") + " bytes)"; } } public BencodeSubFileinfo[] Files { protected set; get; } public String FilesTxt { protected set; get; } public BencodeFile(String filepath) { if (string.IsNullOrWhiteSpace(filepath)) { throw new ArgumentNullException("filepath is Null"); } if (File.Exists(filepath) == false) { throw new FileNotFoundException(filepath + " Not Found"); } try { this.FilePath = filepath; Read(Bencode.DecodeTorrentFile(this.FilePath)); } catch { throw; } } public BencodeFile(Stream stream, Encoding encoding = null) { if (stream == null) { throw new ArgumentNullException("Argument Is Null"); } try { if (encoding == null) { TorrentFile t = Bencode.DecodeTorrentFile(stream); Read(t); } else { Read(Bencode.DecodeTorrentFile(stream, encoding)); } } catch { throw; } } private void Read(TorrentFile torrent) { // 파일 정보 가져오기 try { BDictionary info = torrent.Info; this.Size = 0; List<BencodeSubFileinfo> tfiles = new List<BencodeSubFileinfo>(); if (info.ContainsKey("files")) { BList fileList = (BList)info["files"]; if (fileList != null) { foreach (BDictionary fdic in fileList) { BList filepathList = (BList)fdic["path"]; Size += long.Parse(fdic["length"].ToString()); String path = String.Empty; foreach (IBObject f in filepathList) { path += @"\" + f.ToString(); } if (path.StartsWith(@"\")) { path = path.Substring(1); } BencodeSubFileinfo item = new BencodeSubFileinfo(); item.FilePath = path; item.FileSize = long.Parse(fdic["length"].ToString()); tfiles.Add(item); } } else { if (info.ContainsKey("length")) { Size = long.Parse(info["length"].ToString()); } else { Size = 0; } } } else if (info.ContainsKey("name")) { String filename = info["name"].ToString(); BencodeSubFileinfo item = new BencodeSubFileinfo(); item.FilePath = filename; if (info.ContainsKey("length")) { item.FileSize = long.Parse(info["length"].ToString()); } tfiles.Add(item); this.Size = item.FileSize; } this.Files = tfiles.ToArray(); if (this.Files != null && this.Files.Length > 0) { foreach (BencodeSubFileinfo f in Files) { FilesTxt += "\r\n" + f.ToString(); } if (FilesTxt.StartsWith("\r\n")) { FilesTxt = FilesTxt.Substring("\r\n".Length); } } this.HashKey = torrent.CalculateInfoHash(); this.Announce = torrent.Comment; this.AnnounceList = torrent.AnnounceList; this.Comment = torrent.Comment; this.CreatedBy = torrent.CreatedBy; this.CreationDate = torrent.CreationDate; this.Encoding = torrent.Encoding; } catch { throw; } } } }

[사용 예제]

public bool Parsing() { BencodeFile tf = null; try { if (String.IsNullOrWhiteSpace(this.FilePath)) { using (HttpConnect httpConnectHandler = HttpConnect.Create()) { using (Stream stream = httpConnectHandler.DownloadStream(this.Url)) { tf = new BencodeFile(stream); } } } else { tf = new BencodeFile(this.FilePath); } this.IncludeFiles = tf.FilesTxt; this.IncludeFileSize = tf.Size; this.CreationDate = tf.CreationDate; this.CreateBy = tf.CreatedBy; this.CreationDate = tf.CreationDate; this.Comment = tf.Comment; this.HashKey = tf.HashKey; return true; } catch (Exception ex) { Logger.LogCritical(ex); } return false; }

그냥 한번 만들어 봤는데 참조 하세요.