// Assume we can read up to an offset of 1<<63 - 1.
		remaining = maxint64
	}
	return &SectionReader{r, off, off, remaining, n}
}

// SectionReader implements Read, Seek, and ReadAt on a section
// of an underlying [ReaderAt].
type SectionReader struct {
	r     ReaderAt // constant after creation
	base  int64    // constant after creation
	off   int64
	limit int64 // constant after creation

// ArchiveHeader holds information about a big archive file header
type ArchiveHeader struct {
	magic string
}

// Member represents a member of an AIX big archive.
type Member struct {
	MemberHeader
	sr *io.SectionReader
}

// MemberHeader holds information about a big archive member
type MemberHeader struct {
	Name string
	Size uint64
}

// OpenArchive opens the named archive using os.Open and prepares it for use

type File interface {
	io.Reader
	io.ReaderAt
	io.Seeker
	io.Closer
}

// helper types to turn a []byte into a File

type sectionReadCloser struct {
	*io.SectionReader
	io.Closer
}

func (rc sectionReadCloser) Close() error {
	if rc.Closer != nil {
		return rc.Closer.Close()
	}
	return nil

type File struct {
	FileHeader
	Sections  []*Section
	Progs     []*Prog
	closer    io.Closer
	gnuNeed   []verneed
	gnuVersym []byte
}

// A SectionHeader represents a single ELF section header.
type SectionHeader struct {
	Name      string
	Type      SectionType
	Flags     SectionFlag
	Addr      uint64
	Offset    uint64
	Size      uint64
	Link      uint32
	Info      uint32

	"io"
	"os"
	"strings"
)

// SectionHeader holds information about an XCOFF section header.
type SectionHeader struct {
	Name           string
	VirtualAddress uint64
	Size           uint64
	Type           uint32
	Relptr         uint64
	Nreloc         uint32
}

type Section struct {
	SectionHeader
	Relocs []Reloc
	io.ReaderAt
	sr *io.SectionReader
}

		{"SectionFlag", Type, 0},
		{"SectionHeader", Type, 0},
		{"SectionHeader.Addr", Field, 0},
		{"SectionHeader.Addralign", Field, 0},
		{"SectionHeader.Entsize", Field, 0},
		{"SectionHeader.FileSize", Field, 6},
		{"SectionHeader.Flags", Field, 0},
		{"SectionHeader.Info", Field, 0},
		{"SectionHeader.Link", Field, 0},
		{"SectionHeader.Name", Field, 0},
		{"SectionHeader.Offset", Field, 0},

	Header
	Questions   []Question
	Answers     []Resource
	Authorities []Resource
	Additionals []Resource
}

type section uint8

const (
	sectionNotStarted section = iota
	sectionHeader
	sectionQuestions
	sectionAnswers
	sectionAuthorities
	sectionAdditionals
	sectionDone

	headerBitQR = 1 << 15 // query/response (response=1)
	headerBitAA = 1 << 10 // authoritative