h:    &Header{PAXRecords: map[string]string{"GOLANG.x": strings.Repeat("a", maxSpecialFileSize)}},
	}} {
		w := NewWriter(io.Discard)
		if err := w.WriteHeader(test.h); err != ErrFieldTooLong {
			t.Errorf("%v: w.WriteHeader() = %v, want ErrFieldTooLong", test.name, err)
		}
	}
}

// testNonEmptyWriter wraps an io.Writer and ensures that
// Write is never called with an empty buffer.

		} else {
			dir, file := path.Split(realName)
			name = path.Join(dir, "PaxHeaders.0", file)
			flag = TypeXHeader
		}
		data := buf.String()
		if len(data) > maxSpecialFileSize {
			return ErrFieldTooLong
		}
		if err := tw.writeRawFile(name, data, flag, FormatPAX); err != nil || isGlobal {
			return err // Global headers return here
		}
	}

	// Pack the main header.

var tarinsecurepath = godebug.New("tarinsecurepath")

var (
	ErrHeader          = errors.New("archive/tar: invalid tar header")
	ErrWriteTooLong    = errors.New("archive/tar: write too long")
	ErrFieldTooLong    = errors.New("archive/tar: header field too long")
	ErrWriteAfterClose = errors.New("archive/tar: write after close")
	ErrInsecurePath    = errors.New("archive/tar: insecure file path")

			},
			Format: FormatPAX,
		}},
	}, {
		file: "testdata/pax-bad-hdr-file.tar",
		err:  ErrHeader,
	}, {
		file: "testdata/pax-bad-hdr-large.tar.bz2",
		err:  ErrFieldTooLong,
	}, {
		file: "testdata/pax-bad-mtime-file.tar",
		err:  ErrHeader,
	}, {
		file: "testdata/pax-pos-size-file.tar",
		headers: []*Header{{
			Name:     "foo",
			Mode:     0640,