func stack492()  { var buf [492]byte; use(buf[:]); C.callGoStackCheck() }
func stack496()  { var buf [496]byte; use(buf[:]); C.callGoStackCheck() }
func stack500()  { var buf [500]byte; use(buf[:]); C.callGoStackCheck() }
func stack504()  { var buf [504]byte; use(buf[:]); C.callGoStackCheck() }
func stack508()  { var buf [508]byte; use(buf[:]); C.callGoStackCheck() }
func stack512()  { var buf [512]byte; use(buf[:]); C.callGoStackCheck() }

			Name:     "small.txt",
			Mode:     0640,
			Uid:      73025,
			Gid:      5000,
			Size:     5,
			ModTime:  time.Unix(1244428340, 0),
			Typeflag: '0',
			Uname:    "dsymonds",
			Gname:    "eng",
			Format:   FormatGNU,
		}, {
			Name:     "small2.txt",
			Mode:     0640,
			Uid:      73025,
			Gid:      5000,
			Size:     11,
			ModTime:  time.Unix(1244436044, 0),
			Typeflag: '0',

		wantInverted: []sparseEntry{{0, 0}},
	}, {
		in: []sparseEntry{}, size: 5000,
		wantValid:    true,
		wantInverted: []sparseEntry{{0, 5000}},
	}, {
		in: []sparseEntry{{0, 5000}}, size: 5000,
		wantValid:    true,
		wantAligned:  []sparseEntry{{0, 5000}},
		wantInverted: []sparseEntry{{5000, 0}},
	}, {
		in: []sparseEntry{{1000, 4000}}, size: 5000,
		wantValid:    true,
		wantAligned:  []sparseEntry{{1024, 3976}},

		file: "testdata/writer.tar",
		tests: []testFnc{
			testHeader{Header{
				Typeflag: TypeReg,
				Name:     "small.txt",
				Size:     5,
				Mode:     0640,
				Uid:      73025,
				Gid:      5000,
				Uname:    "dsymonds",
				Gname:    "eng",
				ModTime:  time.Unix(1246508266, 0),
			}, nil},
			testWrite{"Kilts", 5, nil},

			testHeader{Header{
				Typeflag: TypeReg,
				Name:     "small2.txt",