Crisis.Ionic.Zip.ZipEntry.MaybeUnsetCompressionMethodForWriting C# (CSharp) Method

        private void MaybeUnsetCompressionMethodForWriting(int cycle)
        {
            // if we've already tried with compression... turn it off this time
            if (cycle > 1)
            {
                _CompressionMethod = 0x0;
                return;
            }
            // compression for directories = 0x00 (No Compression)
            if (IsDirectory)
            {
                _CompressionMethod = 0x0;
                return;
            }

            if (this._Source == ZipEntrySource.ZipFile)
            {
                return; // do nothing
            }

            // If __FileDataPosition is zero, then that means we will get the data
            // from a file or stream.

            // It is never possible to compress a zero-length file, so we check for
            // this condition.

            if (this._Source == ZipEntrySource.Stream)
            {
                // workitem 7742
                if (_sourceStream != null && _sourceStream.CanSeek)
                {
                    // Length prop will throw if CanSeek is false
                    long fileLength = _sourceStream.Length;
                    if (fileLength == 0)
                    {
                        _CompressionMethod = 0x00;
                        return;
                    }
                }
            }
            else if ((this._Source == ZipEntrySource.FileSystem) && (SharedUtilities.GetFileLength(LocalFileName) == 0L))
            {
                _CompressionMethod = 0x00;
                return;
            }

            // Ok, we're getting the data to be compressed from a
            // non-zero-length file or stream, or a file or stream of
            // unknown length, and we presume that it is non-zero.  In
            // that case we check the callback to see if the app wants
            // to tell us whether to compress or not.
            if (SetCompression != null)
                CompressionLevel = SetCompression(LocalFileName, _FileNameInArchive);

            // finally, set CompressionMethod to None if CompressionLevel is None
            if (CompressionLevel == (short)Crisis.Ionic.Zlib.CompressionLevel.None &&
                CompressionMethod == Crisis.Ionic.Zip.CompressionMethod.Deflate)
                _CompressionMethod = 0x00;

            return;
        }