duplicati/Duplicati/Library/Utility/ProgressReportingStream.cs

#region Disclaimer / License
// Copyright (C) 2015, The Duplicati Team
// http://www.duplicati.com, info@duplicati.com
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
// 
#endregion
using System;
using System.Collections.Generic;
using System.Text;

namespace Duplicati.Library.Utility
{
    /// <summary>
    /// This is a stream wrapper that reports the current progress of reading or writing the stream to the supplied delegate
    /// </summary>
    public class ProgressReportingStream : OverrideableStream
    {
        private readonly Action<long> m_progress;
        private long m_streamOffset;

        public ProgressReportingStream(System.IO.Stream basestream, Action<long> progress)
            : base(basestream)
        {
            m_streamOffset = 0;
            m_progress = progress;
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            ReportProgress();
            
            int r = base.Read(buffer, offset, count);
            m_streamOffset += r;

            ReportProgress();
            
            return r;
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            ReportProgress();
            
            base.Write(buffer, offset, count);
            m_streamOffset += count;

            ReportProgress();
        }

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
        }

        private void ReportProgress()
        {
            if (m_progress != null)
                m_progress(m_streamOffset);
        }
    }
}