type ObjReaderFn func(inputReader io.Reader, h http.Header, cleanupFns ...func()) (r *GetObjectReader, err error)

// NewGetObjectReader creates a new GetObjectReader. The cleanUpFns
// are called on Close() in FIFO order as passed in ObjReadFn(). NOTE: It is
// assumed that clean up functions do not panic (otherwise, they may
// not all run!).
func NewGetObjectReader(rs *HTTPRangeSpec, oi ObjectInfo, opts ObjectOptions) (

	TypeLink    = '1' // Hard link
	TypeSymlink = '2' // Symbolic link
	TypeChar    = '3' // Character device node
	TypeBlock   = '4' // Block device node
	TypeDir     = '5' // Directory
	TypeFifo    = '6' // FIFO node

	// Type '7' is reserved.
	TypeCont = '7'

	// Type 'x' is used by the PAX format to store key-value records that
	// are only relevant to the next file.
	// This package transparently handles these types.

		// directory.
		h: &Header{
			Name:     "dir/",
			Mode:     0755,
			Size:     0,
			ModTime:  time.Unix(1360601116, 0),
			Typeflag: TypeDir,
		},
		fm: 0755 | fs.ModeDir,
	}, {
		// fifo node.
		h: &Header{
			Name:     "dev/initctl",
			Mode:     0600,
			Size:     0,
			ModTime:  time.Unix(1360578949, 0),
			Typeflag: TypeFifo,
		},
		fm: 0600 | fs.ModeNamedPipe,
	}, {