return false
	}
	var pre sparseEntry
	for _, cur := range sp {
		switch {
		case cur.Offset < 0 || cur.Length < 0:
			return false // Negative values are never okay
		case cur.Offset > math.MaxInt64-cur.Length:
			return false // Integer overflow with large length
		case cur.endOffset() > size:
			return false // Region extends beyond the actual size
		case pre.endOffset() > cur.Offset:

			}
			return spd
		}(),
	}}

	for i, v := range vectors {
		var hdr Header
		hdr.PAXRecords = v.inputHdrs
		r := strings.NewReader(v.inputData + "#") // Add canary byte
		tr := Reader{curr: &regFileReader{r, int64(r.Len())}}
		got, err := tr.readGNUSparsePAXHeaders(&hdr)
		if !equalSparseEntries(got, v.wantMap) {
			t.Errorf("test %d, readGNUSparsePAXHeaders(): got %v, want %v", i, got, v.wantMap)
		}

	/*
		// Write the sparse map and setup the sparse writer if necessary.
		if len(spd) > 0 {
			// Use tw.curr since the sparse map is accounted for in hdr.Size.
			if _, err := tw.curr.Write(spb); err != nil {
				return err
			}
			tw.curr = &sparseFileWriter{tw.curr, spd, 0}
		}
	*/
	return nil
}

func (tw *Writer) writeGNUHeader(hdr *Header) error {

	case "S2":
		curSize = 2
		curQ = 0
	case "S4":
		curSize = 2
		curQ = 1
	case "D1":
		curSize = 3
		curQ = 0
	case "D2":
		curSize = 3
		curQ = 1
	default:
		return 0, errors.New("invalid arrangement in ARM64 register list")
	}
	return (int64(curQ) & 1 << 30) | (int64(curSize&3) << 10), nil
}

// ARM64RegisterListOffset generates offset encoding according to AArch64 specification.

	if isHeaderOnlyType(hdr.Typeflag) {
		nb = 0
	}
	if nb < 0 {
		return ErrHeader
	}

	tr.pad = blockPadding(nb)
	tr.curr = &regFileReader{r: tr.r, nb: nb}
	return nil
}

// handleSparseFile checks if the current file is a sparse format of any type
// and sets the curr reader appropriately.
func (tr *Reader) handleSparseFile(hdr *Header, rawHdr *block) error {
	var spd sparseDatas
	var err error