/// <summary> /// Decodes a BEncodedString from the supplied StreamReader /// </summary> /// <param name="reader">The StreamReader containing the BEncodedString</param> internal override void DecodeInternal(RawReader reader) { if (reader == null) { throw new ArgumentNullException("reader"); } int letterCount; var length = string.Empty; while ((reader.PeekByte() != -1) && (reader.PeekByte() != ':')) // read in how many characters { length += (char)reader.ReadByte(); // the string is } if (reader.ReadByte() != ':') // remove the ':' { throw new BEncodingException("Invalid data found. Aborting"); } if (!int.TryParse(length, out letterCount)) { throw new BEncodingException(string.Format("Invalid BEncodedString. Length was '{0}' instead of a number", length)); } TextBytes = new byte[letterCount]; if (reader.Read(TextBytes, 0, letterCount) != letterCount) { throw new BEncodingException("Couldn't decode string"); } }
private void DecodeInternal(RawReader reader, bool strictDecoding) { BEncodedString oldkey = null; if (reader.ReadByte() != 'd') { throw new BEncodingException("Invalid data found. Aborting"); // Remove the leading 'd' } while ((reader.PeekByte() != -1) && (reader.PeekByte() != 'e')) { var key = (BEncodedString)Decode(reader); 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; var value = Decode(reader); _dictionary.Add(key, value); } if (reader.ReadByte() != 'e') // remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting"); } }
/// <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) { var torrent = new BEncodedDictionary(); if (reader.ReadByte() != 'd') { throw new BEncodingException("Invalid data found. Aborting"); // Remove the leading 'd' } while ((reader.PeekByte() != -1) && (reader.PeekByte() != 'e')) { var key = (BEncodedString)Decode(reader); BEncodedValue value = null; if (reader.PeekByte() == 'd') { value = new BEncodedDictionary(); ((BEncodedDictionary)value).DecodeInternal(reader, key.Text.ToLower().Equals("info")); } 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); }
/// <summary> /// Decodes a BEncodedList from the given StreamReader /// </summary> /// <param name="reader"></param> internal override void DecodeInternal(RawReader reader) { if (reader.ReadByte() != 'l') // Remove the leading 'l' { throw new BEncodingException("Invalid data found. Aborting"); } while ((reader.PeekByte() != -1) && (reader.PeekByte() != 'e')) { _list.Add(Decode(reader)); } if (reader.ReadByte() != 'e') // Remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting"); } }
/// <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) { var sign = 1; if (reader == null) { throw new ArgumentNullException("reader"); } if (reader.ReadByte() != 'i') // remove the leading 'i' { throw new BEncodingException("Invalid data found. Aborting."); } if (reader.PeekByte() == '-') { sign = -1; reader.ReadByte(); } int letter; while (((letter = reader.PeekByte()) != -1) && letter != 'e') { if (letter < '0' || letter > '9') { throw new BEncodingException("Invalid number found."); } InternalNumber = InternalNumber * 10 + (letter - '0'); reader.ReadByte(); } if (reader.ReadByte() != 'e') //remove the trailing 'e' { throw new BEncodingException("Invalid data found. Aborting."); } InternalNumber *= sign; }
/// <summary> /// Decode BEncoded data in the given RawReader /// </summary> /// <param name="reader"> The RawReader containing the BEncoded data </param> /// <returns> BEncodedValue containing the data that was in the stream </returns> public static BEncodedValue Decode(RawReader reader) { if (reader == null) { throw new ArgumentNullException("reader"); } BEncodedValue data; switch (reader.PeekByte()) { case 'i': // Integer data = new BEncodedNumber(); break; case 'd': // Dictionary data = new BEncodedDictionary(); break; case 'l': // List data = new BEncodedList(); break; case '1': // String case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': case '0': data = new BEncodedString(); break; default: throw new BEncodingException("Could not find what value to decode"); } data.DecodeInternal(reader); return(data); }