if s.Flags&SHF_COMPRESSED == 0 {
			s.ReaderAt = s.sr
			s.Size = s.FileSize
		} else {
			// Read the compression header.
			switch f.Class {
			case ELFCLASS32:
				var ch Chdr32
				chdata := make([]byte, unsafe.Sizeof(ch))
				if _, err := s.sr.ReadAt(chdata, 0); err != nil {
					return nil, err
				}
				s.compressionType = CompressionType(bo.Uint32(chdata[unsafe.Offsetof(ch.Type):]))

// ELF32 Dynamic structure. The ".dynamic" section contains an array of them.
type Dyn32 struct {
	Tag int32  /* Entry type. */
	Val uint32 /* Integer/Address value. */
}

// ELF32 Compression header.
type Chdr32 struct {
	Type      uint32
	Size      uint32
	Addralign uint32
}

/*
 * Relocation entries.
 */

// ELF32 Relocations that don't need an addend field.
type Rel32 struct {

				Type:      uint32(elf.COMPRESS_ZLIB),
				Size:      uint64(total),
				Addralign: uint64(ctxt.Arch.Alignment),
			})
		case 4:
			binary.Write(&buf, ctxt.Arch.ByteOrder, elf.Chdr32{
				Type:      uint32(elf.COMPRESS_ZLIB),
				Size:      uint32(total),
				Addralign: uint32(ctxt.Arch.Alignment),
			})
		default:
			log.Fatalf("can't compress header size:%d", ctxt.Arch.PtrSize)
		}