if err == io.EOF && !r.readOneFrame {
			err = io.ErrUnexpectedEOF
		}
		return r.wrapError(relativeOffset, err)
	}

	if magic := binary.LittleEndian.Uint32(r.scratch[:4]); magic != 0xfd2fb528 {
		if magic >= 0x184d2a50 && magic <= 0x184d2a5f {
			// This is a skippable frame.
			r.blockOffset += int64(relativeOffset) + 4
			if err := r.skipFrame(); err != nil {
				return err
			}