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

        private void CopyThroughOneEntry(Stream outStream)
        {
            // Just read the entry from the existing input zipfile and write to the output.
            // But, if metadata has changed (like file times or attributes), or if the ZIP64
            // option has changed, we can re-stream the entry data but must recompute the
            // metadata.
            if (this.LengthOfHeader == 0)
                throw new BadStateException("Bad header length.");

            // is it necessary to re-constitute new metadata for this entry?
            bool needRecompute = _metadataChanged ||
                (this.ArchiveStream is ZipSegmentedStream) ||
                (outStream is ZipSegmentedStream) ||
                (_InputUsesZip64 && _container.UseZip64WhenSaving == Zip64Option.Never) ||
                (!_InputUsesZip64 && _container.UseZip64WhenSaving == Zip64Option.Always);

            if (needRecompute)
                CopyThroughWithRecompute(outStream);
            else
                CopyThroughWithNoChange(outStream);

            // zip64 housekeeping
            _entryRequiresZip64 = new Nullable<bool>
                (_CompressedSize >= 0xFFFFFFFF || _UncompressedSize >= 0xFFFFFFFF ||
                _RelativeOffsetOfLocalHeader >= 0xFFFFFFFF
                );

            _OutputUsesZip64 = new Nullable<bool>(_container.Zip64 == Zip64Option.Always || _entryRequiresZip64.Value);
        }