/// <summary>
/// Returns the number of bytes to read from the stream.
/// </summary>
/// <param name="state">Instance of <see cref="T:NavtelecomProtocol.SessionState" />.</param>
/// <param name="reader"><see cref="T:SharpStructures.BinaryListReader" /> linked to a FLEX message body.</param>
/// <param name="writer"><see cref="T:SharpStructures.MemoryBufferWriter" /> with data to be sent to the client.</param>
/// <param name="token">The token to monitor for cancellation requests.</param>
/// <returns>A task that represents the asynchronous operation. Contains the total number of bytes to read from the socket. Zero bytes to stop reading and send the response.</returns>
public Task <int> GetPendingBytesAsync(SessionState state, BinaryListReader reader, MemoryBufferWriter writer,
CancellationToken token)
{
switch (reader.ByteList.Count)
{
case 2:
return(Task.FromResult(1));
case 3:
var messageSize = FlexMessageTable.GetFlexMessageSize(state);
var messageCount = reader.ByteList[2];
writer.Write(Response);
writer.Write(messageCount);
writer.Write(BinaryUtilities.GetCrc8(writer.Buffer));
return(Task.FromResult(messageSize * messageCount + 1));
default:
if (reader.ByteList.Last() != BinaryUtilities.GetCrc8(reader.ByteList.Take(reader.ByteList.Count - 1)))
{
throw new ArgumentException("Invalid FLEX message CRC.");
}
return(Task.FromResult(0));
}
}
/// <summary>
/// Returns the number of bytes to read from the stream.
/// </summary>
/// <param name="state">Instance of <see cref="T:NavtelecomProtocol.SessionState" />.</param>
/// <param name="reader"><see cref="T:SharpStructures.BinaryListReader" /> linked to a FLEX message body.</param>
/// <param name="writer"><see cref="T:SharpStructures.MemoryBufferWriter" /> with data to be sent to the client.</param>
/// <param name="token">The token to monitor for cancellation requests.</param>
/// <returns>A task that represents the asynchronous operation. Contains the total number of bytes to read from the socket. Zero bytes to stop reading and send the response.</returns>
public async Task <int> GetPendingBytesAsync(SessionState state, BinaryListReader reader, MemoryBufferWriter writer, CancellationToken token)
{
switch (reader.ByteList.Count)
{
case 2:
return(13);
case 15:
reader.SetPosition(13);
return(reader.ReadUInt16() + 1);
default:
if (reader.ByteList.Last() != BinaryUtilities.GetCrc8(reader.ByteList.Take(reader.ByteList.Count - 1)))
{
throw new ArgumentException("Invalid FLEX message CRC.");
}
reader.SetPosition(4);
var result = reader.ReadByte();
var crashTime = reader.ReadUInt32();
var offset = reader.ReadUInt32();
var sizeRead = reader.ReadUInt16();
if (state.CrashInfo != null && result == 0x00 && state.CrashInfo.Timestamp == crashTime)
{
for (var i = 0; i < sizeRead; ++i)
{
state.CrashInfo.Data[offset + i] = reader.ByteList[15 + i];
}
state.CrashInfo.Offset = offset + sizeRead;
var bytesLeft = state.CrashInfo.Data.Length - state.CrashInfo.Offset;
writer.Write(CrashInformation.CrashDataQuery);
writer.Write(crashTime);
writer.Write(state.CrashInfo.Offset);
writer.Write(bytesLeft > ushort.MaxValue ? ushort.MaxValue : (ushort)bytesLeft);
writer.Write(BinaryUtilities.GetCrc8(writer.Buffer));
if (bytesLeft == 0)
{
if (_onReadyCrash != null)
{
await _onReadyCrash(state, token).ConfigureAwait(false);
}
state.CrashInfo = null;
}
}
return(0);
}
}
/// <summary>
/// Returns the number of bytes to read from the stream.
/// </summary>
/// <param name="state">Instance of <see cref="T:NavtelecomProtocol.SessionState" />.</param>
/// <param name="reader"><see cref="T:SharpStructures.BinaryListReader" /> linked to a FLEX message body.</param>
/// <param name="writer"><see cref="T:SharpStructures.MemoryBufferWriter" /> with data to be sent to the client.</param>
/// <param name="token">The token to monitor for cancellation requests.</param>
/// <returns>A task that represents the asynchronous operation. Contains the total number of bytes to read from the socket. Zero bytes to stop reading and send the response.</returns>
public Task <int> GetPendingBytesAsync(SessionState state, BinaryListReader reader, MemoryBufferWriter writer,
CancellationToken token)
{
switch (reader.ByteList.Count)
{
case 2:
return(Task.FromResult(12));
case 14:
return(Task.FromResult(reader.ByteList[13] + 1));
default:
if (reader.ByteList.Last() != BinaryUtilities.GetCrc8(reader.ByteList.Take(reader.ByteList.Count - 1)))
{
throw new ArgumentException("Invalid FLEX message CRC.");
}
reader.SetPosition(2);
reader.ReadByte();
reader.ReadByte();
var crashTime = reader.ReadUInt32();
var crashLength = reader.ReadUInt32();
var flags = reader.ReadByte();
var nameLength = reader.ReadByte();
var crashName = new string(reader.ReadBytes(nameLength).Select(x => (char)x).ToArray());
if (crashTime > 0 && crashLength > 0 && flags == 0xFF)
{
state.CrashInfo = new CrashInformation
{
Data = new byte[crashLength],
Name = crashName,
Timestamp = crashTime
};
writer.Write(CrashInformation.CrashDataQuery);
writer.Write(crashTime);
writer.Write(0U);
writer.Write(crashLength > ushort.MaxValue ? ushort.MaxValue : (ushort)crashLength);
writer.Write(BinaryUtilities.GetCrc8(writer.Buffer));
}
return(Task.FromResult(0));
}
}
