mkdir(path, perm, callback) { callback(enosys()); },
			open(path, flags, mode, callback) { callback(enosys()); },
			read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
			readdir(path, callback) { callback(enosys()); },
			readlink(path, callback) { callback(enosys()); },
			rename(from, to, callback) { callback(enosys()); },
			rmdir(path, callback) { callback(enosys()); },

	if err != nil {
		return err
	}
	if err := adb("push", platformToolDir, path.Join(deviceGoroot, relToolDir)); err != nil {
		return err
	}

	// Copy all other files from GOROOT.
	dirents, err := os.ReadDir(goroot)
	if err != nil {
		return err
	}
	for _, de := range dirents {
		switch de.Name() {
		case "bin", "pkg":
			// We already created GOROOT/bin and GOROOT/pkg above; skip those.
			continue
		}

	// If so, we try to add it to certificate manager.
	root, err := Open(globalCertsDir.Get())
	if err != nil {
		return nil, nil, false, err
	}
	defer root.Close()

	files, err := root.Readdir(-1)
	if err != nil {
		return nil, nil, false, err
	}
	for _, file := range files {
		// Ignore all
		// - regular files
		// - "CAs" directory
		// - any directory which starts with ".."

			objSize, err = gr.ObjInfo.DecryptedSize()
			if err != nil {
				return nil, ObjectInfo{}, err
			}
		} else {
			objSize = gr.ObjInfo.Size
		}

		files, err := zipindex.ReadDir(b[len(b)-size:], objSize, nil)
		if err == nil {
			return files, gr.ObjInfo, nil
		}
		var terr zipindex.ErrNeedMoreData
		if errors.As(err, &terr) {
			size = int(terr.FromEnd)

pkg go/doc, func ToHTML //deprecated #51082
pkg go/doc, func ToText //deprecated #51082
pkg io/ioutil, func NopCloser //deprecated #42026
pkg io/ioutil, func ReadAll //deprecated #42026
pkg io/ioutil, func ReadDir //deprecated #42026
pkg io/ioutil, func ReadFile //deprecated #42026
pkg io/ioutil, func TempDir //deprecated #42026
pkg io/ioutil, func TempFile //deprecated #42026
pkg io/ioutil, func WriteFile //deprecated #42026

		// to verify for legacy version.
		if formatLegacy {
			// We only need this code if we are moving
			// from `xl.json` to `xl.meta`, we can avoid
			// one extra readdir operation here for all
			// new deployments.
			entries, err := readDir(currentDataPath)
			if err != nil && err != errFileNotFound {
				return res, osErrToFileErr(err)
			}
			for _, entry := range entries {

pkg os, func OpenFile(string, int, FileMode) (*File, error)
pkg os, func SameFile(FileInfo, FileInfo) bool
pkg os, func Stat(string) (FileInfo, error)
pkg os, method (*File) Chmod(FileMode) error
pkg os, method (*File) Readdir(int) ([]FileInfo, error)
pkg os, method (*File) Stat() (FileInfo, error)
pkg os, method (*PathError) Error() string
pkg os, method (*PathError) Timeout() bool
pkg os, method (*PathError) Unwrap() error

pkg io/fs, type PathError struct, Op string
pkg io/fs, type PathError struct, Path string
pkg io/fs, type ReadDirFS interface { Open, ReadDir }
pkg io/fs, type ReadDirFS interface, Open(string) (File, error)
pkg io/fs, type ReadDirFS interface, ReadDir(string) ([]DirEntry, error)
pkg io/fs, type ReadDirFile interface { Close, Read, ReadDir, Stat }
pkg io/fs, type ReadDirFile interface, Close() error

		t.Errorf("Opening %q with fs.FS API succeeded", "")
	}
	if _, err := r.Open("test.txt"); err != nil {
		t.Errorf("Error opening %q with fs.FS API: %v", "test.txt", err)
	}
	dirEntries, err := fs.ReadDir(r, ".")
	if err != nil {
		t.Fatalf("Error reading the root directory: %v", err)
	}
	if len(dirEntries) != 1 || dirEntries[0].Name() != "test.txt" {
		t.Errorf("Unexpected directory entries")

import (
	"errors"
	"io"
	"unicode/utf8"
)

// A Reader implements the [io.Reader], [io.ReaderAt], [io.WriterTo], [io.Seeker],
// [io.ByteScanner], and [io.RuneScanner] interfaces by reading from
// a byte slice.
// Unlike a [Buffer], a Reader is read-only and supports seeking.
// The zero value for Reader operates like a Reader of an empty slice.
type Reader struct {
	s        []byte
	i        int64 // current reading index