func()

in backup.go [73:113]

• 39 lines of code
• 11 McCabe index (conditional complexity)

func (r *BackupStreamReader) Next() (*BackupHeader, error) {
	if r.bytesLeft > 0 {
		if s, ok := r.r.(io.Seeker); ok {
			// Make sure Seek on io.SeekCurrent sometimes succeeds
			// before trying the actual seek.
			if _, err := s.Seek(0, io.SeekCurrent); err == nil {
				if _, err = s.Seek(r.bytesLeft, io.SeekCurrent); err != nil {
					return nil, err
				}
				r.bytesLeft = 0
			}
		}
		if _, err := io.Copy(ioutil.Discard, r); err != nil {
			return nil, err
		}
	}
	var wsi win32StreamId
	if err := binary.Read(r.r, binary.LittleEndian, &wsi); err != nil {
		return nil, err
	}
	hdr := &BackupHeader{
		Id:         wsi.StreamId,
		Attributes: wsi.Attributes,
		Size:       int64(wsi.Size),
	}
	if wsi.NameSize != 0 {
		name := make([]uint16, int(wsi.NameSize/2))
		if err := binary.Read(r.r, binary.LittleEndian, name); err != nil {
			return nil, err
		}
		hdr.Name = syscall.UTF16ToString(name)
	}
	if wsi.StreamId == BackupSparseBlock {
		if err := binary.Read(r.r, binary.LittleEndian, &hdr.Offset); err != nil {
			return nil, err
		}
		hdr.Size -= 8
	}
	r.bytesLeft = hdr.Size
	return hdr, nil
}