Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/csharp/src/Google.Protobuf/LimitedInputStream.cs

-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-    
-using System;
-using System.IO;
-
-namespace Google.Protobuf
-{
-    /// <summary>
-    /// Stream implementation which proxies another stream, only allowing a certain amount
-    /// of data to be read. Note that this is only used to read delimited streams, so it
-    /// doesn't attempt to implement everything.
-    /// </summary>
-    internal sealed class LimitedInputStream : Stream
-    {
-        private readonly Stream proxied;
-        private int bytesLeft;
-
-        internal LimitedInputStream(Stream proxied, int size)
-        {
-            this.proxied = proxied;
-            bytesLeft = size;
-        }
-
-        public override bool CanRead
-        {
-            get { return true; }
-        }
-
-        public override bool CanSeek
-        {
-            get { return false; }
-        }
-
-        public override bool CanWrite
-        {
-            get { return false; }
-        }
-
-        public override void Flush()
-        {
-        }
-
-        public override long Length
-        {
-            get { throw new NotSupportedException(); }
-        }
-
-        public override long Position
-        {
-            get { throw new NotSupportedException(); }
-            set { throw new NotSupportedException(); }
-        }
-
-        public override int Read(byte[] buffer, int offset, int count)
-        {
-            if (bytesLeft > 0)
-            {
-                int bytesRead = proxied.Read(buffer, offset, Math.Min(bytesLeft, count));
-                bytesLeft -= bytesRead;
-                return bytesRead;
-            }
-            return 0;
-        }
-
-        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();
-        }
-    }
-}