private MessageData DeserializeMessage(Span <byte> buffer, out int consumed)
{
consumed = 0;
var header = new MessageHeader();
header.MessageType = (MessageType)buffer[0];
buffer = buffer.Slice(sizeof(byte));
consumed += sizeof(byte);
header.MessageLength = NetworkBitConverter.ToUInt24(buffer);
buffer = buffer.Slice(3);
consumed += 3;
header.Timestamp = NetworkBitConverter.ToUInt32(buffer);
buffer = buffer.Slice(sizeof(uint));
consumed += sizeof(uint);
header.MessageStreamId = header.MessageStreamId;
// Override message stream id
buffer = buffer.Slice(3);
consumed += 3;
var offset = consumed;
consumed += (int)header.MessageLength;
header.Timestamp += MessageHeader.Timestamp;
return(new MessageData()
{
Header = header,
DataOffset = offset,
DataLength = header.MessageLength
});
}
private async Task <MessageHeader> ReadHeader(CancellationToken ct = default)
{
byte[] headerBuffer = null;
byte[] timestampBuffer = null;
try
{
headerBuffer = _arrayPool.Rent(15);
timestampBuffer = _arrayPool.Rent(4);
await _stream.ReadBytesAsync(headerBuffer.AsMemory(0, 15), ct);
var type = (MessageType)headerBuffer[4];
var length = NetworkBitConverter.ToUInt24(headerBuffer.AsSpan(5, 3));
headerBuffer.AsSpan(8, 3).CopyTo(timestampBuffer.AsSpan(1));
timestampBuffer[0] = headerBuffer[11];
var timestamp = NetworkBitConverter.ToInt32(timestampBuffer.AsSpan(0, 4));
var streamId = NetworkBitConverter.ToUInt24(headerBuffer.AsSpan(12, 3));
var header = new MessageHeader()
{
MessageLength = length,
MessageStreamId = streamId,
MessageType = type,
Timestamp = (uint)timestamp
};
return(header);
}
finally
{
if (headerBuffer != null)
{
_arrayPool.Return(headerBuffer);
}
if (timestampBuffer != null)
{
_arrayPool.Return(timestampBuffer);
}
}
}