ln.protocols.helper/RequestContentStream.cs

using System;
using System.IO;

namespace ln.protocols.helper
{
    public class RequestContentStream : Stream
    {
        public Stream BaseStream { get; }
        private int contentLength;
        private int position;
         
        
        public RequestContentStream(Stream baseStream, int contentLength)
        {
            BaseStream = baseStream;
            this.contentLength = contentLength;
        }
        
        public override int ReadByte()
        {
            int b = BaseStream.ReadByte();
            if (b >= 0)
                position++;
            return b;
        }

        public override void Flush() { }
        public override int Read(byte[] buffer, int offset, int count)
        {
            if (position == contentLength)
                return 0;
            
            if (position + count > contentLength)
                count = contentLength - position;

            int nread = BaseStream.Read(buffer, offset, count);
            if (nread >= 0)
                position += nread;
            return nread;
        }
        
        public override long Seek(long offset, SeekOrigin origin)
        {
            throw new System.NotImplementedException();
        }

        public override void SetLength(long value) => throw new System.NotImplementedException();
        public override void Write(byte[] buffer, int offset, int count) => throw new System.NotImplementedException();

        public override bool CanRead => true;
        public override bool CanSeek => false;
        public override bool CanWrite => false;
        public override long Length => contentLength;

        public override long Position
        {
            get => position;
            set => throw new NotImplementedException();
        }

        protected override void Dispose(bool disposing)
        {
            if (position < contentLength)
            {
                byte[] buffer = new byte[4096];
                while (Read(buffer, 0, buffer.Length) > 0) {}
            }
        }
    }
}