82 lines
1.9 KiB
C#
82 lines
1.9 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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using System.IO;
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namespace Mono.Profiler.Log {
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public class LogStream : Stream {
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public Stream BaseStream { get; }
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public virtual bool EndOfStream => BaseStream.Position == BaseStream.Length;
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public override bool CanRead => true;
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public override bool CanSeek => false;
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public override bool CanWrite => false;
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public override long Length => throw new NotSupportedException ();
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public override long Position {
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get => throw new NotSupportedException ();
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set => throw new NotSupportedException ();
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}
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readonly byte[] _byteBuffer = new byte [1];
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public LogStream (Stream baseStream)
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{
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if (baseStream == null)
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throw new ArgumentNullException (nameof (baseStream));
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if (!baseStream.CanRead)
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throw new ArgumentException ("Stream does not support reading.", nameof (baseStream));
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BaseStream = baseStream;
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}
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protected override void Dispose (bool disposing)
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{
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if (disposing)
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BaseStream.Dispose ();
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}
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public override void Flush ()
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{
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throw new NotSupportedException ();
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}
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public override int ReadByte ()
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{
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// The base method on Stream is extremely inefficient in that it
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// allocates a 1-byte array for every call. Simply use a private
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// buffer instead.
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return Read (_byteBuffer, 0, sizeof (byte)) == 0 ? -1 : _byteBuffer [0];
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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return BaseStream.Read (buffer, offset, count);
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException ();
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}
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public override void SetLength (long value)
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{
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throw new NotSupportedException ();
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException ();
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}
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}
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}
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