Removed all the pointers

file.go

@@ -19,49 +19,47 @@ import (
 
 // File represents a file inside a squashfs archive.
 type File struct {
-	full     *data.FullReader
+	full     data.FullReader
-	rdr      *data.Reader
+	rdr      data.Reader
-	parent   *FS
+	rdrInit  bool
+	parent   FS
 	r        *Reader
 	b        squashfslow.FileBase
 	dirsRead int
 }
 
 // Creates a new *File from the given *squashfs.Base
-func (r *Reader) FileFromBase(b squashfslow.FileBase, parent *FS) *File {
+func (r *Reader) FileFromBase(b squashfslow.FileBase, parent FS) File {
-	return &File{
+	return File{
 		b:      b,
 		parent: parent,
 		r:      r,
 	}
 }
 
-func (f *File) FS() (*FS, error) {
+func (f File) FS() (FS, error) {
 	if !f.IsDir() {
-		return nil, errors.New("not a directory")
+		return FS{}, errors.New("not a directory")
 	}
-	d, err := f.b.ToDir(&f.r.Low)
+	d, err := f.b.ToDir(f.r.Low)
 	if err != nil {
-		return nil, err
+		return FS{}, err
 	}
-	return &FS{d: d, parent: f.parent, r: f.r}, nil
+	return FS{d: d, parent: &f.parent, r: f.r}, nil
 }
 
 // Closes the underlying readers.
 // Further calls to Read and WriteTo will re-create the readers.
 // Never returns an error.
 func (f *File) Close() error {
-	if f.rdr != nil {
+	f.rdr.Close()
-		return f.rdr.Close()
+	f.full.Close()
-	}
-	f.rdr = nil
-	f.full = nil
 	return nil
 }
 
 // Returns the file the symlink points to.
 // If the file isn't a symlink, or points to a file outside the archive, returns nil.
-func (f *File) GetSymlinkFile() fs.File {
+func (f File) GetSymlinkFile() fs.File {
 	if !f.IsSymlink() {
 		return nil
 	}
@@ -76,21 +74,21 @@ func (f *File) GetSymlinkFile() fs.File {
 }
 
 // Returns whether the file is a directory.
-func (f *File) IsDir() bool {
+func (f File) IsDir() bool {
 	return f.b.IsDir()
 }
 
 // Returns whether the file is a regular file.
-func (f *File) IsRegular() bool {
+func (f File) IsRegular() bool {
 	return f.b.IsRegular()
 }
 
 // Returns whether the file is a symlink.
-func (f *File) IsSymlink() bool {
+func (f File) IsSymlink() bool {
 	return f.b.Inode.Type == inode.Sym || f.b.Inode.Type == inode.ESym
 }
 
-func (f *File) Mode() fs.FileMode {
+func (f File) Mode() fs.FileMode {
 	return f.b.Inode.Mode()
 }
 
@@ -99,7 +97,7 @@ func (f *File) Read(b []byte) (int, error) {
 	if !f.IsRegular() {
 		return 0, errors.New("file is not a regular file")
 	}
-	if f.rdr == nil {
+	if !f.rdrInit {
 		err := f.initializeReaders()
 		if err != nil {
 			return 0, err
@@ -114,7 +112,7 @@ func (f *File) ReadDir(n int) ([]fs.DirEntry, error) {
 	if !f.IsDir() {
 		return nil, errors.New("file is not a directory")
 	}
-	d, err := f.b.ToDir(&f.r.Low)
+	d, err := f.b.ToDir(f.r.Low)
 	if err != nil {
 		return nil, err
 	}
@@ -141,7 +139,7 @@ func (f *File) ReadDir(n int) ([]fs.DirEntry, error) {
 }
 
 // Returns the file's fs.FileInfo
-func (f *File) Stat() (fs.FileInfo, error) {
+func (f File) Stat() (fs.FileInfo, error) {
 	uid, err := f.b.Uid(&f.r.Low)
 	if err != nil {
 		return nil, err
@@ -154,7 +152,7 @@ func (f *File) Stat() (fs.FileInfo, error) {
 }
 
 // SymlinkPath returns the symlink's target path. Is the File isn't a symlink, returns an empty string.
-func (f *File) SymlinkPath() string {
+func (f File) SymlinkPath() string {
 	switch f.b.Inode.Type {
 	case inode.Sym:
 		return string(f.b.Inode.Data.(inode.Symlink).Target)
@@ -170,7 +168,7 @@ func (f *File) WriteTo(w io.Writer) (int64, error) {
 	if !f.IsRegular() {
 		return 0, errors.New("file is not a regular file")
 	}
-	if f.full == nil {
+	if !f.rdrInit {
 		err := f.initializeReaders()
 		if err != nil {
 			return 0, err
@@ -181,11 +179,17 @@ func (f *File) WriteTo(w io.Writer) (int64, error) {
 
 func (f *File) initializeReaders() error {
 	var err error
-	f.rdr, f.full, err = f.b.GetRegFileReaders(&f.r.Low)
+	f.rdr, f.full, err = f.b.GetRegFileReaders(f.r.Low)
+	if err == nil {
+		f.rdrInit = true
+	} else {
+		f.rdr.Close()
+		f.full.Close()
+	}
 	return err
 }
 
-func (f *File) deviceDevices() (maj uint32, min uint32) {
+func (f File) deviceDevices() (maj uint32, min uint32) {
 	var dev uint32
 	switch f.b.Inode.Type {
 	case inode.Char, inode.Block:
@@ -196,8 +200,8 @@ func (f *File) deviceDevices() (maj uint32, min uint32) {
 	return dev >> 8, dev & 0x000FF
 }
 
-func (f *File) path() string {
+func (f File) path() string {
-	if f.parent == nil {
+	if f.parent.d.Name == "" {
 		return f.b.Name
 	}
 	return filepath.Join(f.parent.path(), f.b.Name)
@@ -205,13 +209,13 @@ func (f *File) path() string {
 
 // Extract the file to the given folder. If the file is a folder, the folder's contents will be extracted to the folder.
 // Uses default extraction options.
-func (f *File) Extract(folder string) error {
+func (f File) Extract(folder string) error {
 	return f.ExtractWithOptions(folder, DefaultOptions())
 }
 
 // Extract the file to the given folder. If the file is a folder, the folder's contents will be extracted to the folder.
 // Allows setting various extraction options via ExtractionOptions.
-func (f *File) ExtractWithOptions(path string, op *ExtractionOptions) error {
+func (f File) ExtractWithOptions(path string, op *ExtractionOptions) error {
 	if op.manager == nil {
 		op.manager = routinemanager.NewManager(op.SimultaneousFiles)
 		if op.LogOutput != nil {
@@ -227,7 +231,7 @@ func (f *File) ExtractWithOptions(path string, op *ExtractionOptions) error {
 	}
 	switch f.b.Inode.Type {
 	case inode.Dir, inode.EDir:
-		d, err := f.b.ToDir(&f.r.Low)
+		d, err := f.b.ToDir(f.r.Low)
 		if err != nil {
 			if op.Verbose {
 				log.Println("Failed to create squashfs.Directory for", path)

fs.go

@@ -21,11 +21,11 @@ type FS struct {
 }
 
 // Creates a new *FS from the given squashfs.directory
-func (r *Reader) FSFromDirectory(d squashfslow.Directory, parent *FS) *FS {
+func (r *Reader) FSFromDirectory(d squashfslow.Directory, parent FS) FS {
-	return &FS{
+	return FS{
 		d:      d,
 		r:      r,
-		parent: parent,
+		parent: &parent,
 	}
 }
 
@@ -90,7 +90,7 @@ func (f *FS) Glob(pattern string) (out []string, err error) {
 }
 
 // Opens the file at name. Returns a *File as an fs.File.
-func (f *FS) Open(name string) (fs.File, error) {
+func (f FS) Open(name string) (fs.File, error) {
 	name = filepath.Clean(name)
 	if !fs.ValidPath(name) {
 		return nil, &fs.PathError{
@@ -142,7 +142,7 @@ func (f *FS) Open(name string) (fs.File, error) {
 			Err:  fs.ErrNotExist,
 		}
 	}
-	d, err := b.ToDir(&f.r.Low)
+	d, err := b.ToDir(f.r.Low)
 	if err != nil {
 		return nil, err
 	}
@@ -151,7 +151,7 @@ func (f *FS) Open(name string) (fs.File, error) {
 
 // Returns all DirEntry's for the directory at name.
 // If name is not a directory, returns an error.
-func (f *FS) ReadDir(name string) ([]fs.DirEntry, error) {
+func (f FS) ReadDir(name string) ([]fs.DirEntry, error) {
 	name = filepath.Clean(name)
 	if !fs.ValidPath(name) {
 		return nil, &fs.PathError{
@@ -171,7 +171,7 @@ func (f *FS) ReadDir(name string) ([]fs.DirEntry, error) {
 }
 
 // Returns the contents of the file at name.
-func (f *FS) ReadFile(name string) (out []byte, err error) {
+func (f FS) ReadFile(name string) (out []byte, err error) {
 	name = filepath.Clean(name)
 	if !fs.ValidPath(name) {
 		return nil, &fs.PathError{
@@ -194,7 +194,7 @@ func (f *FS) ReadFile(name string) (out []byte, err error) {
 }
 
 // Returns the fs.FileInfo for the file at name.
-func (f *FS) Stat(name string) (fs.FileInfo, error) {
+func (f FS) Stat(name string) (fs.FileInfo, error) {
 	name = filepath.Clean(name)
 	if !fs.ValidPath(name) {
 		return nil, &fs.PathError{
@@ -214,7 +214,7 @@ func (f *FS) Stat(name string) (fs.FileInfo, error) {
 }
 
 // Returns the FS at dir
-func (f *FS) Sub(dir string) (fs.FS, error) {
+func (f FS) Sub(dir string) (fs.FS, error) {
 	dir = filepath.Clean(dir)
 	if !fs.ValidPath(dir) {
 		return nil, &fs.PathError{
@@ -242,26 +242,32 @@ func (f *FS) Sub(dir string) (fs.FS, error) {
 
 // Extract the FS to the given folder. If the file is a folder, the folder's contents will be extracted to the folder.
 // Uses default extraction options.
-func (f *FS) Extract(folder string) error {
+func (f FS) Extract(folder string) error {
 	return f.File().Extract(folder)
 }
 
 // Extract the FS to the given folder. If the file is a folder, the folder's contents will be extracted to the folder.
 // Allows setting various extraction options via ExtractionOptions.
-func (f *FS) ExtractWithOptions(folder string, op *ExtractionOptions) error {
+func (f FS) ExtractWithOptions(folder string, op *ExtractionOptions) error {
 	return f.File().ExtractWithOptions(folder, op)
 }
 
 // Returns the FS as a *File
-func (f *FS) File() *File {
+func (f FS) File() *File {
+	if f.parent != nil {
+		return &File{
+			b:      f.d.FileBase,
+			parent: *f.parent,
+			r:      f.r,
+		}
+	}
 	return &File{
-		b:      f.d.FileBase,
+		b: f.d.FileBase,
-		parent: f.parent,
+		r: f.r,
-		r:      f.r,
 	}
 }
 
-func (f *FS) path() string {
+func (f FS) path() string {
 	if f.parent == nil {
 		return f.d.Name
 	}

low/data/fullreader.go

@@ -4,6 +4,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
+	"io/fs"
 	"math"
 	"runtime"
 	"sync"
@@ -23,10 +24,11 @@ type FullReader struct {
 	finalBlockSize uint64
 	blockSize      uint32
 	goroutineLimit uint16
+	closed         bool
 }
 
-func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor, sizes []uint32, finalBlockSize uint64, blockSize uint32) *FullReader {
+func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor, sizes []uint32, finalBlockSize uint64, blockSize uint32) FullReader {
-	return &FullReader{
+	return FullReader{
 		r:              r,
 		d:              d,
 		sizes:          sizes,
@@ -37,6 +39,15 @@ func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor
 	}
 }
 
+func (r *FullReader) Close() error {
+	r.closed = true
+	r.r = nil
+	r.d = nil
+	r.frag = nil
+	r.sizes = nil
+	return nil
+}
+
 func (r *FullReader) AddFrag(frag FragReaderConstructor) {
 	r.frag = frag
 }
@@ -77,6 +88,9 @@ func (r FullReader) process(index uint64, fileOffset uint64, pool *sync.Pool, re
 }
 
 func (r FullReader) WriteTo(w io.Writer) (int64, error) {
+	if r.closed {
+		return 0, fs.ErrClosed
+	}
 	// if wa, is := w.(io.WriterAt); is {
 	// 	return r.writeToWriteAt(wa)
 	// }

low/data/reader.go

@@ -3,6 +3,7 @@ package data
 import (
 	"encoding/binary"
 	"io"
+	"io/fs"
 
 	"github.com/CalebQ42/squashfs/internal/decompress"
 )
@@ -17,10 +18,11 @@ type Reader struct {
 	curIndex       uint64
 	finalBlockSize uint64
 	blockSize      uint32
+	closed         bool
 }
 
-func NewReader(r io.Reader, d decompress.Decompressor, sizes []uint32, finalBlockSize uint64, blockSize uint32) *Reader {
+func NewReader(r io.Reader, d decompress.Decompressor, sizes []uint32, finalBlockSize uint64, blockSize uint32) Reader {
-	return &Reader{
+	return Reader{
 		r:              r,
 		d:              d,
 		sizes:          sizes,
@@ -66,6 +68,9 @@ func (r *Reader) advance() error {
 }
 
 func (r *Reader) Read(b []byte) (int, error) {
+	if r.closed {
+		return 0, fs.ErrClosed
+	}
 	curRead := 0
 	var toRead int
 	for curRead < len(b) {
@@ -83,6 +88,9 @@ func (r *Reader) Read(b []byte) (int, error) {
 }
 
 func (r *Reader) Close() error {
+	r.closed = true
+	r.r = nil
+	r.d = nil
 	if r.frag != nil {
 		if l, ok := r.frag.(*io.LimitedReader); ok {
 			if cl, ok := l.R.(io.Closer); ok {
@@ -90,6 +98,8 @@ func (r *Reader) Close() error {
 			}
 		}
 	}
+	r.frag = nil
+	r.sizes = nil
 	r.dat = nil
 	return nil
 }

low/directory.go

@@ -18,7 +18,7 @@ type Directory struct {
 	Entries []directory.Entry
 }
 
-func (r *Reader) directoryFromRef(ref uint64, name string) (Directory, error) {
+func (r Reader) directoryFromRef(ref uint64, name string) (Directory, error) {
 	i, err := r.InodeFromRef(ref)
 	if err != nil {
 		return Directory{}, err
@@ -54,7 +54,7 @@ func (r *Reader) directoryFromRef(ref uint64, name string) (Directory, error) {
 	}, nil
 }
 
-func (d *Directory) Open(r *Reader, path string) (FileBase, error) {
+func (d Directory) Open(r Reader, path string) (FileBase, error) {
 	path = filepath.Clean(path)
 	if path == "." || path == "" {
 		return d.FileBase, nil

low/file_base.go

@@ -16,11 +16,11 @@ type FileBase struct {
 	Name  string
 }
 
-func (r *Reader) BaseFromInode(i inode.Inode, name string) FileBase {
+func (r Reader) BaseFromInode(i inode.Inode, name string) FileBase {
 	return FileBase{Inode: i, Name: name}
 }
 
-func (r *Reader) BaseFromEntry(e directory.Entry) (FileBase, error) {
+func (r Reader) BaseFromEntry(e directory.Entry) (FileBase, error) {
 	in, err := r.InodeFromEntry(e)
 	if err != nil {
 		return FileBase{}, err
@@ -28,7 +28,7 @@ func (r *Reader) BaseFromEntry(e directory.Entry) (FileBase, error) {
 	return FileBase{Inode: in, Name: e.Name}, nil
 }
 
-func (r *Reader) BaseFromRef(ref uint64, name string) (FileBase, error) {
+func (r Reader) BaseFromRef(ref uint64, name string) (FileBase, error) {
 	in, err := r.InodeFromRef(ref)
 	if err != nil {
 		return FileBase{}, err
@@ -36,19 +36,19 @@ func (r *Reader) BaseFromRef(ref uint64, name string) (FileBase, error) {
 	return FileBase{Inode: in, Name: name}, nil
 }
 
-func (b *FileBase) Uid(r *Reader) (uint32, error) {
+func (b FileBase) Uid(r *Reader) (uint32, error) {
 	return r.Id(b.Inode.UidInd)
 }
 
-func (b *FileBase) Gid(r *Reader) (uint32, error) {
+func (b FileBase) Gid(r *Reader) (uint32, error) {
 	return r.Id(b.Inode.GidInd)
 }
 
-func (b *FileBase) IsDir() bool {
+func (b FileBase) IsDir() bool {
 	return b.Inode.Type == inode.Dir || b.Inode.Type == inode.EDir
 }
 
-func (b *FileBase) ToDir(r *Reader) (Directory, error) {
+func (b FileBase) ToDir(r Reader) (Directory, error) {
 	var blockStart uint32
 	var size uint32
 	var offset uint16
@@ -75,18 +75,18 @@ func (b *FileBase) ToDir(r *Reader) (Directory, error) {
 		return Directory{}, err
 	}
 	return Directory{
-		FileBase: *b,
+		FileBase: b,
 		Entries:  entries,
 	}, nil
 }
 
-func (b *FileBase) IsRegular() bool {
+func (b FileBase) IsRegular() bool {
 	return b.Inode.Type == inode.Fil || b.Inode.Type == inode.EFil
 }
 
-func (b *FileBase) GetRegFileReaders(r *Reader) (*data.Reader, *data.FullReader, error) {
+func (b FileBase) GetRegFileReaders(r Reader) (data.Reader, data.FullReader, error) {
 	if !b.IsRegular() {
-		return nil, nil, errors.New("not a regular file")
+		return data.Reader{}, data.FullReader{}, errors.New("not a regular file")
 	}
 	var blockStart uint64
 	var fragIndex uint32
@@ -113,13 +113,13 @@ func (b *FileBase) GetRegFileReaders(r *Reader) (*data.Reader, *data.FullReader,
 		}
 		frag := data.NewReader(toreader.NewReader(r.r, int64(ent.Start)), r.d, []uint32{ent.Size}, uint64(r.Superblock.BlockSize), r.Superblock.BlockSize)
 		frag.Read(make([]byte, fragOffset))
-		return io.LimitReader(frag, int64(fragSize)), nil
+		return io.LimitReader(&frag, int64(fragSize)), nil
 	}
 	outRdr := data.NewReader(toreader.NewReader(r.r, int64(blockStart)), r.d, sizes, fragSize, r.Superblock.BlockSize)
 	if fragIndex != 0xffffffff {
 		f, err := frag()
 		if err != nil {
-			return nil, nil, err
+			return data.Reader{}, data.FullReader{}, err
 		}
 		outRdr.AddFrag(f)
 	}
@@ -130,9 +130,9 @@ func (b *FileBase) GetRegFileReaders(r *Reader) (*data.Reader, *data.FullReader,
 	return outRdr, outFull, nil
 }
 
-func (b *FileBase) GetFullReader(r *Reader) (*data.FullReader, error) {
+func (b *FileBase) GetFullReader(r *Reader) (data.FullReader, error) {
 	if !b.IsRegular() {
-		return nil, errors.New("not a regular file")
+		return data.FullReader{}, errors.New("not a regular file")
 	}
 	var blockStart uint64
 	var fragIndex uint32
@@ -161,15 +161,15 @@ func (b *FileBase) GetFullReader(r *Reader) (*data.FullReader, error) {
 			}
 			frag := data.NewReader(toreader.NewReader(r.r, int64(ent.Start)), r.d, []uint32{ent.Size}, uint64(r.Superblock.BlockSize), r.Superblock.BlockSize)
 			frag.Read(make([]byte, fragOffset))
-			return io.LimitReader(frag, int64(fragSize)), nil
+			return io.LimitReader(&frag, int64(fragSize)), nil
 		})
 	}
 	return outFull, nil
 }
 
-func (b *FileBase) GetReader(r *Reader) (*data.Reader, error) {
+func (b *FileBase) GetReader(r *Reader) (data.Reader, error) {
 	if !b.IsRegular() {
-		return nil, errors.New("not a regular file")
+		return data.Reader{}, errors.New("not a regular file")
 	}
 	var blockStart uint64
 	var fragIndex uint32
@@ -193,11 +193,11 @@ func (b *FileBase) GetReader(r *Reader) (*data.Reader, error) {
 	if fragIndex != 0xffffffff {
 		ent, err := r.fragEntry(fragIndex)
 		if err != nil {
-			return nil, err
+			return data.Reader{}, err
 		}
 		frag := data.NewReader(toreader.NewReader(r.r, int64(ent.Start)), r.d, []uint32{ent.Size}, uint64(r.Superblock.BlockSize), r.Superblock.BlockSize)
 		frag.Read(make([]byte, fragOffset))
-		outRdr.AddFrag(io.LimitReader(frag, int64(fragSize)))
+		outRdr.AddFrag(io.LimitReader(&frag, int64(fragSize)))
 	}
 	return outRdr, nil
 }

low/inode.go

@@ -7,7 +7,7 @@ import (
 	"github.com/CalebQ42/squashfs/low/inode"
 )
 
-func (r *Reader) InodeFromRef(ref uint64) (inode.Inode, error) {
+func (r Reader) InodeFromRef(ref uint64) (inode.Inode, error) {
 	offset, meta := (ref>>16)+r.Superblock.InodeTableStart, ref&0xFFFF
 	rdr := metadata.NewReader(toreader.NewReader(r.r, int64(offset)), r.d)
 	defer rdr.Close()
@@ -18,7 +18,7 @@ func (r *Reader) InodeFromRef(ref uint64) (inode.Inode, error) {
 	return inode.Read(rdr, r.Superblock.BlockSize)
 }
 
-func (r *Reader) InodeFromEntry(e directory.Entry) (inode.Inode, error) {
+func (r Reader) InodeFromEntry(e directory.Entry) (inode.Inode, error) {
 	rdr := metadata.NewReader(toreader.NewReader(r.r, int64(r.Superblock.InodeTableStart)+int64(e.BlockStart)), r.d)
 	defer rdr.Close()
 	rdr.Read(make([]byte, e.Offset))

low/reader.go

@@ -39,21 +39,20 @@ type Reader struct {
 	Superblock  superblock
 }
 
-func NewReader(r io.ReaderAt) (rdr *Reader, err error) {
+func NewReader(r io.ReaderAt) (rdr Reader, err error) {
-	rdr = new(Reader)
 	rdr.r = r
 	err = binary.Read(toreader.NewReader(r, 0), binary.LittleEndian, &rdr.Superblock)
 	if err != nil {
-		return nil, errors.Join(errors.New("failed to read superblock"), err)
+		return rdr, errors.Join(errors.New("failed to read superblock"), err)
 	}
 	if !rdr.Superblock.ValidMagic() {
-		return nil, ErrorMagic
+		return rdr, ErrorMagic
 	}
 	if !rdr.Superblock.ValidBlockLog() {
-		return nil, ErrorLog
+		return rdr, ErrorLog
 	}
 	if !rdr.Superblock.ValidVersion() {
-		return nil, ErrorVersion
+		return rdr, ErrorVersion
 	}
 	switch rdr.Superblock.CompType {
 	case ZlibCompression:
@@ -61,12 +60,12 @@ func NewReader(r io.ReaderAt) (rdr *Reader, err error) {
 	case LZMACompression:
 		rdr.d, err = decompress.NewLzma()
 		if err != nil {
-			return nil, err
+			return rdr, err
 		}
 	case LZOCompression:
 		rdr.d, err = decompress.NewLzo()
 		if err != nil {
-			return nil, err
+			return rdr, err
 		}
 	case XZCompression:
 		rdr.d = decompress.Xz{}
@@ -75,11 +74,11 @@ func NewReader(r io.ReaderAt) (rdr *Reader, err error) {
 	case ZSTDCompression:
 		rdr.d = decompress.Zstd{}
 	default:
-		return nil, errors.New("invalid compression type. possible corrupted archive")
+		return rdr, errors.New("invalid compression type. possible corrupted archive")
 	}
 	rdr.Root, err = rdr.directoryFromRef(rdr.Superblock.RootInodeRef, "")
 	if err != nil {
-		return nil, errors.Join(errors.New("failed to read root directory"), err)
+		return rdr, errors.Join(errors.New("failed to read root directory"), err)
 	}
 	return
 }
@@ -207,7 +206,7 @@ func (r *Reader) inodeRef(i uint32) (uint64, error) {
 	return r.exportTable[i], nil
 }
 
-func (r *Reader) Inode(i uint32) (inode.Inode, error) {
+func (r Reader) Inode(i uint32) (inode.Inode, error) {
 	ref, err := r.inodeRef(i)
 	if err != nil {
 		return inode.Inode{}, err

low/reader_test.go

@@ -77,7 +77,7 @@ func TestReader(t *testing.T) {
 	path := filepath.Join(tmpDir, "extractTest")
 	os.RemoveAll(path)
 	os.MkdirAll(path, 0777)
-	err = extractToDir(rdr, &rdr.Root.FileBase, path)
+	err = extractToDir(rdr, rdr.Root.FileBase, path)
 	t.Fatal(err)
 }
 
@@ -101,11 +101,11 @@ func TestSingleFile(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	err = extractToDir(rdr, &b, path)
+	err = extractToDir(rdr, b, path)
 	t.Fatal(err)
 }
 
-func extractToDir(rdr *Reader, b *FileBase, folder string) error {
+func extractToDir(rdr Reader, b FileBase, folder string) error {
 	path := filepath.Join(folder, b.Name)
 	if b.IsDir() {
 		d, err := b.ToDir(rdr)
@@ -122,7 +122,7 @@ func extractToDir(rdr *Reader, b *FileBase, folder string) error {
 			if err != nil {
 				return err
 			}
-			err = extractToDir(rdr, &nestBast, path)
+			err = extractToDir(rdr, nestBast, path)
 			if err != nil {
 				return err
 			}

reader.go

@@ -9,26 +9,26 @@ import (
 )
 
 type Reader struct {
-	*FS
+	FS
 	Low squashfslow.Reader
 }
 
-func NewReader(r io.ReaderAt) (*Reader, error) {
+func NewReader(r io.ReaderAt) (Reader, error) {
 	rdr, err := squashfslow.NewReader(r)
 	if err != nil {
-		return nil, err
+		return Reader{}, err
 	}
-	out := &Reader{
+	out := Reader{
-		Low: *rdr,
+		Low: rdr,
 	}
-	out.FS = &FS{
+	out.FS = FS{
 		d: rdr.Root,
-		r: out,
+		r: &out,
 	}
 	return out, nil
 }
 
-func NewReaderAtOffset(r io.ReaderAt, offset int64) (*Reader, error) {
+func NewReaderAtOffset(r io.ReaderAt, offset int64) (Reader, error) {
 	return NewReader(toreader.NewOffsetReader(r, offset))
 }