System.IO.Compression.ZipStorer.Store C# (CSharp) Méthode

        private void Store(ref ZipFileEntry _zfe, Stream _source)
        {
            byte[] buffer = new byte[16384];
            int bytesRead;
            uint totalRead = 0;
            Stream outStream;

            long posStart = this.ZipFileStream.Position;
            long sourceStart = _source.Position;

            if (_zfe.Method == Compression.Store)
                outStream = this.ZipFileStream;
            else
                outStream = new DeflateStream(this.ZipFileStream, CompressionMode.Compress, true);

            _zfe.Crc32 = 0 ^ 0xffffffff;

            do
            {
                bytesRead = _source.Read(buffer, 0, buffer.Length);
                totalRead += (uint)bytesRead;
                if (bytesRead > 0)
                {
                    outStream.Write(buffer, 0, bytesRead);

                    for (uint i = 0; i < bytesRead; i++)
                    {
                        _zfe.Crc32 = ZipStorer.CrcTable[(_zfe.Crc32 ^ buffer[i]) & 0xFF] ^ (_zfe.Crc32 >> 8);
                    }
                }
            } while (bytesRead == buffer.Length);
            outStream.Flush();

            if (_zfe.Method == Compression.Deflate)
                outStream.Dispose();

            _zfe.Crc32 ^= 0xffffffff;
            _zfe.FileSize = totalRead;
            _zfe.CompressedSize = (uint)(this.ZipFileStream.Position - posStart);

            // Verify for real compression
            if (_zfe.Method == Compression.Deflate && !this.ForceDeflating && _source.CanSeek && _zfe.CompressedSize > _zfe.FileSize)
            {
                // Start operation again with Store algorithm
                _zfe.Method = Compression.Store;
                this.ZipFileStream.Position = posStart;
                this.ZipFileStream.SetLength(posStart);
                _source.Position = sourceStart;
                this.Store(ref _zfe, _source);
            }
        }