System.IO.Compression.DeflateStream.PurgeBuffers C# (CSharp) Method

        private void PurgeBuffers(bool disposing)
        {
            if (!disposing)
                return;

            if (_stream == null)
                return;

            if (_mode != CompressionMode.Compress)
                return;
            
            // Some deflaters (e.g. ZLib) write more than zero bytes for zero byte inputs.
            // This round-trips and we should be ok with this, but our legacy managed deflater
            // always wrote zero output for zero input and upstack code (e.g. ZipArchiveEntry)
            // took dependencies on it. Thus, make sure to only "flush" when we actually had
            // some input:
            if (_wroteBytes)
            {
                // Compress any bytes left
                WriteDeflaterOutput();

                // Pull out any bytes left inside deflater:
                bool finished;
                do
                {
                    int compressedBytes;
                    finished = _deflater.Finish(_buffer, out compressedBytes);

                    if (compressedBytes > 0)
                        _stream.Write(_buffer, 0, compressedBytes);
                } while (!finished);
            }
            else
            {
                // In case of zero length buffer, we still need to clean up the native created stream before 
                // the object get disposed because eventually ZLibNative.ReleaseHandle will get called during 
                // the dispose operation and although it frees the stream but it return error code because the 
                // stream state was still marked as in use. The symptoms of this problem will not be seen except 
                // if running any diagnostic tools which check for disposing safe handle objects
                bool finished;
                do
                {
                    int compressedBytes;
                    finished = _deflater.Finish(_buffer, out compressedBytes);
                } while (!finished);
            }
        }