ICSharpCode.SharpZipLib.Zip.ZipFile.AddUpdate C# (CSharp) Method

        private void AddUpdate(ZipUpdate update) {
            contentsEdited_=true;

            int index=FindExistingUpdate(update.Entry.Name);

            if (index>=0) {
                if (updates_[index]==null) {
                    updateCount_+=1;
                }

                // Direct replacement is faster than delete and add.
                updates_[index]=update;
            } else{
                index = updates_.Count;
                updates_.Add(update);
                updateCount_+=1;
                updateIndex_.Add(update.Entry.Name, index);
            }
        }