duplicati/Duplicati/CommandLine/BackendTester/NonSeekableStream.cs

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// 
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// copy of this software and associated documentation files (the "Software"), 
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// Software is furnished to do so, subject to the following conditions:
// 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
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using System;
using System.Collections.Generic;
using System.Text;

namespace Duplicati.CommandLine.BackendTester
{
    /// <summary>
    /// This class prevents the base stream from being seekable to 
    /// ensure that all operations work correctly on streams that
    /// are not seekable.
    /// </summary>
    public class NonSeekableStream : Library.Utility.OverrideableStream
    {
        public NonSeekableStream(System.IO.Stream stream)
            : base(stream)
        { }

        public override bool CanSeek
        {
            get
            {
                return false;
            }
        }

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

        public override long Seek(long offset, System.IO.SeekOrigin origin)
        {
            throw new NotSupportedException();
        }

        public override void SetLength(long value)
        {
            throw new NotSupportedException();
        }
    }
}