/// <summary> /// Attempts to parse raw data into a structured packet /// </summary> /// <param name="buffer">Raw data to parse</param> /// <param name="packet">Parsed packet</param> /// <param name="count">The length of the packet in bytes</param> /// <param name="index">The index into the buffer at which the packet begins</param> /// <returns>True if parsing was successful, false if it is not.</returns> internal static bool TryParse(byte[] buffer, int index, int count, out Radiotap packet) { try { using (var ms = new MemoryStream(buffer, index, count, false)) { using (var br = new BinaryReader(ms)) { var version = br.ReadByte(); var pad = br.ReadByte(); var length = br.ReadUInt16(); var present = br.ReadUInt32(); if (count - br.BaseStream.Position < length - 8) { packet = null; return false; } var fieldData = br.ReadBytes(length - 8); packet = null; IEEE802_11 payload80211; if (IEEE802_11.TryParse( buffer, index + (int)br.BaseStream.Position, (int)(count - br.BaseStream.Position), out payload80211)) { packet = new Radiotap<IEEE802_11> { Payload = payload80211 }; } if (packet == null) { Generic payload; Generic.TryParse( buffer, index + (int)br.BaseStream.Position, (int)(count - br.BaseStream.Position), out payload); // This can never fail, so I'm not checking the output packet = new Radiotap<Generic> { Payload = payload }; } packet.Version = version; packet.Pad = pad; packet.LengthRadiotap = length; packet.Present = present; packet.FieldData = fieldData; return true; } } } catch (Exception) { packet = null; return false; } }
/// <summary> /// Attempts to parse raw data into a structured packet /// </summary> /// <param name="buffer">Raw data to parse</param> /// <param name="packet">Parsed packet</param> /// <param name="count">The length of the packet in bytes</param> /// <param name="index">The index into the buffer at which the packet begins</param> /// <returns>True if parsing was successful, false if it is not.</returns> internal static bool TryParse(byte[] buffer, int index, int count, out Radiotap packet) { try { using (var ms = new MemoryStream(buffer, index, count, false)) { using (var br = new BinaryReader(ms)) { var version = br.ReadByte(); var pad = br.ReadByte(); var length = br.ReadUInt16(); var present = br.ReadUInt32(); if (count - br.BaseStream.Position < length - 8) { packet = null; return(false); } var fieldData = br.ReadBytes(length - 8); packet = null; IEEE802_11 payload80211; if (IEEE802_11.TryParse( buffer, index + (int)br.BaseStream.Position, (int)(count - br.BaseStream.Position), out payload80211)) { packet = new Radiotap <IEEE802_11> { Payload = payload80211 }; } if (packet == null) { Generic payload; Generic.TryParse( buffer, index + (int)br.BaseStream.Position, (int)(count - br.BaseStream.Position), out payload); // This can never fail, so I'm not checking the output packet = new Radiotap <Generic> { Payload = payload }; } packet.Version = version; packet.Pad = pad; packet.LengthRadiotap = length; packet.Present = present; packet.FieldData = fieldData; return(true); } } } catch (Exception) { packet = null; return(false); } }