Please provide efficient (zero alloc) alternative to IStateSerializer

[mkosieradzki]

Please provide an efficient (zero alloc) alternative to IStateSerializer - allowing to read and write to non-contiguous memory.

public interface IStateSerializer2<T>
{
  T Read(ReadOnlySequence<byte> sequence);
  T Read(T baseValue, ReadOnlySequence<byte> sequence);
  void Write(T value, IBufferWriter<byte> binaryWriter);
  void Write(T baseValue, T targetValue, IBufferWriter<byte> binaryWriter);
}

Both structures ReadOnlySequence<byte> and IBufferWriter<byte> have wide compatibility (.NET Standard 1.1) and allow to avoid unnecessary allocations and allow to use Spans. They are perfect fit for integration with unmanaged code.

I intend to use it with my span-based protocol buffers re-implementation described here: protocolbuffers/protobuf#3431

[MedAnd]

@mkosieradzki - any chance you'll be nuget-ing your span-based protocol buffers re-implementation?

[mkosieradzki]

@MedAnd First I will try to get it to the main repo (at least as a pre-release) - there is some hope, because it will be probably used for gRPC server. Meanwhile I will try to implement an alternative standalone gRPC middleware. If the process will be very slow or I would be unable to get my PRs accepted I will need to create separate nuget packages for both protobuf and gRPC-middleware.