func (m *Mapping) OrigSource() (string, int64) {
	if m.origF == nil {
		return "", 0
	}
	return m.origF.Name(), m.origOff
}
func (m *Mapping) OrigSource() (string, int64) {
	if m.origF == nil {
		return "", 0
	}
	return m.origF.Name(), m.origOff
}
func ( m * Mapping ) OrigSource ( ) ( string , int64 ) { if m . origF == nil { return " " , 0 } return m . origF . Name ( ) , m . origOff }
// For CopyOnWrite mappings, OrigSource returns the file/offset of the
// original copy of the data, or "", 0 if none.
For CopyOnWrite mappings OrigSource returns the file / offset of the original copy of the data or 0 if none .