// WriteHeader writes the type and the size and prepares to accept the object's
// contents. If an invalid t is provided, plumbing.ErrInvalidType is returned. If a
// negative size is provided, ErrNegativeSize is returned.
func (w *Writer) WriteHeader(t plumbing.ObjectType, size int64) error {
if !t.Valid() {
return plumbing.ErrInvalidType
}
if size < 0 {
return ErrNegativeSize
}
b := t.Bytes()
b = append(b, ' ')
b = append(b, []byte(strconv.FormatInt(size, 10))...)
b = append(b, 0)
defer w.prepareForWrite(t, size)
_, err := w.zlib.Write(b)
return err
}
