/// <summary>
        /// Called from ZipFile.Save as each queued entry is processed.
        /// </summary>
        /// <param name="entryName"></param>
        /// <param name="stream"></param>
        protected void WriteItemCallback(string entryName, System.IO.Stream stream)
        {
            BatchResizeItem i = items[entryName];

            if (wouldResize(i))
            {
                //Buffer in a memory stream to avoid stepping on CrcCalculatorStream's broken toes
                using (MemoryStream ms = new MemoryStream()) {
                    s.conf.CurrentImageBuilder.Build(i.PhysicalPath, ms, new ResizeSettings(i.ResizeQuerystring));
                    ms.Position = 0;
                    StreamUtils.CopyTo(ms, stream);
                }
                return; //We're done!
            }


            //For non-resizeable items, Just copy the stream.
            using (System.IO.FileStream s = System.IO.File.OpenRead(i.PhysicalPath)) CopyStreamTo(s, stream);
        }