/// <summary> /// Decodes a BEncodedList from the given StreamReader /// </summary> /// <param name="reader"></param> internal override void DecodeInternal(RawReader reader) { try { if (reader.ReadByte() != 'l') // Remove the leading 'l' { throw new BEncodingException("Invalid data found. Aborting"); } while (reader.PeekChar() != -1 && (char)reader.PeekChar() != 'e') { list.Add(Decode(reader)); } if (reader.ReadByte() != 'e') // Remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting"); } } catch (BEncodingException ex) { throw new BEncodingException("Couldn't decode list", ex); } catch { throw new BEncodingException("Couldn't decode list"); } }
private void DecodeInternal(RawReader reader, bool strictDecoding) { BEncodedString key = null; BEncodedValue value = null; BEncodedString oldkey = null; try { if (reader.ReadByte() != 'd') { throw new BEncodingException("Invalid data found. Aborting"); // Remove the leading 'd' } while (reader.PeekChar() != -1 && (char)reader.PeekChar() != 'e') { key = (BEncodedString)Decode(reader); // keys have to be BEncoded strings if (oldkey != null && oldkey.CompareTo(key) > 0) { if (strictDecoding) { throw new BEncodingException(string.Format( "Illegal BEncodedDictionary. The attributes are not ordered correctly. Old key: {0}, New key: {1}", oldkey, key)); } } oldkey = key; value = Decode(reader); // the value is a BEncoded value _dictionary.Add(key, value); } if (reader.ReadByte() != 'e') // remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting"); } } catch (Exception ex) { throw new BEncodingException("Couldn't decode dictionary", ex); } }
/// <summary> /// Special decoding method for torrent files - allows dictionary attributes to be out of order for the /// overall torrent file, but imposes strict rules on the info dictionary. /// </summary> /// <returns></returns> public static BEncodedDictionary DecodeTorrent(RawReader reader) { BEncodedString key = null; BEncodedValue value = null; BEncodedDictionary torrent = new BEncodedDictionary(); try { if (reader.ReadByte() != 'd') { throw new BEncodingException("Invalid data found. Aborting"); // Remove the leading 'd' } while (reader.PeekChar() != -1 && (char)reader.PeekChar() != 'e') { key = (BEncodedString)Decode(reader); // keys have to be BEncoded strings if (reader.PeekChar() == 'd') { value = new BEncodedDictionary(); bool strictDecoding = key.Text.ToLower().Equals("info"); ((BEncodedDictionary)value).DecodeInternal(reader, strictDecoding); } else { value = Decode(reader); // the value is a BEncoded value } torrent._dictionary.Add(key, value); } if (reader.ReadByte() != 'e') // remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting"); } return(torrent); } catch (Exception ex) { throw new BEncodingException("Couldn't decode dictionary", ex); } }
/// <summary> /// Decodes a BEncoded number from the supplied RawReader /// </summary> /// <param name="reader">RawReader containing a BEncoded Number</param> internal override void DecodeInternal(RawReader reader) { if (reader == null) { throw new ArgumentNullException(nameof(reader)); } try { if (reader.ReadByte() != 'i') // remove the leading 'i' { throw new BEncodingException("Invalid data found. Aborting."); } int letter; while ((letter = reader.PeekChar()) != -1 && letter != 'e') { // TODO: Maybe should completely use a nuget package for BEncode. //if (letter < '0' || letter > '9') //throw new BEncodingException("Invalid number found."); Number = Number * 10 + (letter - '0'); reader.ReadChar(); } if (reader.ReadByte() != 'e') //remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting."); } } catch (BEncodingException ex) { throw new BEncodingException("Couldn't decode number", ex); } catch { throw new BEncodingException("Couldn't decode number"); } }