// Writes a file to the new writer.
func addFile(w *zip.Writer, fh *zip.FileHeader, r io.Reader, crc uint32) error {
fh.Flags = 0 // we're not writing a data descriptor after the file
comp := func(w io.Writer) (io.WriteCloser, error) { return nopCloser{w}, nil }
fw, err := w.CreateHeaderWithCompressor(fh, comp, fixedCrc32{value: crc})
if err == nil {
_, err = io.CopyN(fw, r, int64(fh.CompressedSize64))
}
return err
}
