// Section provides access to PE COFF section.
type Section struct {
	SectionHeader
	Relocs []Reloc

	// Embed ReaderAt for ReadAt method.
	// Do not embed SectionReader directly
	// to avoid having Read and Seek.
	// If a client wants Read and Seek it must use
	// Open() to avoid fighting over the seek offset
	// with other clients.
	io.ReaderAt
	sr *io.SectionReader
}

// Data reads and returns the contents of the PE section s.

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package p

import "io"

type T1 interface {
	io.Reader
}

type T2 struct {
	io.SectionReader
}

type T3 struct { // ERROR "invalid recursive type: T3 refers to itself"
	T1
	T2
	parent T3

		// 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

	t.Run("maxint", func(t *testing.T) {
		_, err := ReadDataAt(bytes.NewReader(input), 1<<62, 0)
		if err == nil {
			t.Error("large read succeeded unexpectedly")
		}
	})

	t.Run("SectionReader", func(t *testing.T) {
		// Reading 0 bytes from an io.SectionReader at the end
		// of the section will return EOF, but ReadDataAt
		// should succeed and return 0 bytes.
		sr := io.NewSectionReader(bytes.NewReader(input), 0, 0)

	closer   io.Closer
}

// A SectionHeader represents a single Plan 9 a.out section header.
// This structure doesn't exist on-disk, but eases navigation
// through the object file.
type SectionHeader struct {
	Name   string
	Size   uint32
	Offset uint32
}

// A Section represents a single section in a Plan 9 a.out file.
type Section struct {
	SectionHeader

	// Embed ReaderAt for ReadAt method.

		// a buffer large enough. Treat this as a read failure.
		return nil, io.ErrUnexpectedEOF
	}

	if n < chunk {
		buf := make([]byte, n)
		_, err := r.ReadAt(buf, off)
		if err != nil {
			// io.SectionReader can return EOF for n == 0,
			// but for our purposes that is a success.
			if err != io.EOF || n > 0 {
				return nil, err
			}
		}
		return buf, nil
	}

	var buf []byte
	buf1 := make([]byte, chunk)

	Scattered bool
}

type Section struct {
	SectionHeader
	Relocs []Reloc

	// Embed ReaderAt for ReadAt method.
	// Do not embed SectionReader directly
	// to avoid having Read and Seek.
	// If a client wants Read and Seek it must use
	// Open() to avoid fighting over the seek offset
	// with other clients.
	io.ReaderAt
	sr *io.SectionReader
}

// 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

			return nil, err
		}
	}
}

// elfFromAr tries to get export data from an archive member as an ELF file.
// If there is no export data, this returns nil, nil.
func elfFromAr(member *io.SectionReader) (io.ReadSeeker, error) {
	ef, err := elf.NewFile(member)
	if err != nil {
		return nil, err
	}
	sec := ef.Section(".go_export")
	if sec == nil {
		return nil, nil
	}
	return sec.Open(), nil
}

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