/// <summary>
/// Reads the message.
/// </summary>
/// <returns>A message.</returns>
public CompressedMessage ReadMessage()
{
var reader = CreateBinaryReader();
var stream = reader.BsonStream;
var messageStartPosition = stream.Position;
var messageLength = stream.ReadInt32();
EnsureMessageLengthIsValid(messageLength);
var requestId = stream.ReadInt32();
var responseTo = stream.ReadInt32();
var opcode = (Opcode)stream.ReadInt32();
EnsureOpcodeIsValid(opcode);
var originalOpcode = (Opcode)stream.ReadInt32();
var uncompressedSize = stream.ReadInt32();
var compressorType = (CompressorType)stream.ReadByte();
var compressor = _compressorSource.Get(compressorType);
using (var uncompressedBuffer = new MultiChunkBuffer(new OutputBufferChunkSource(BsonChunkPool.Default)))
using (var uncompressedStream = new ByteBufferStream(uncompressedBuffer, ownsBuffer: false))
{
uncompressedStream.WriteInt32(uncompressedSize + MessageHeaderLength);
uncompressedStream.WriteInt32(requestId);
uncompressedStream.WriteInt32(responseTo);
uncompressedStream.WriteInt32((int)originalOpcode);
compressor.Decompress(stream, uncompressedStream);
uncompressedStream.Position = 0;
uncompressedBuffer.MakeReadOnly();
var originalMessageEncoderFactory = new BinaryMessageEncoderFactory(uncompressedStream, _encoderSettings, _compressorSource);
var originalMessageEncoder = _originalEncoderSelector.GetEncoder(originalMessageEncoderFactory);
var originalMessage = originalMessageEncoder.ReadMessage();
return(new CompressedMessage(originalMessage, null, compressorType));
}
}
