romrepomgr/RomRepoMgr.Core/StreamWithLength.cs

using System;
using System.IO;

namespace RomRepoMgr.Core
{
    internal sealed class StreamWithLength : Stream
    {
        readonly Stream _baseStream;

        public StreamWithLength(Stream baseStream, long length)
        {
            _baseStream = baseStream;
            Length      = length;
        }

        public override bool CanRead  => _baseStream.CanRead;
        public override bool CanSeek  => _baseStream.CanSeek;
        public override bool CanWrite => _baseStream.CanWrite;
        public override long Length   { get; }

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

        public override void Flush() => _baseStream.Flush();

        public override int Read(byte[] buffer, int offset, int count) => _baseStream.Read(buffer, offset, count);

        public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();

        public override void SetLength(long value) => throw new NotSupportedException();

        public override void Write(byte[] buffer, int offset, int count) => throw new NotSupportedException();

        public override void Close()
        {
            _baseStream.Close();
            base.Close();
        }
    }
}