package mountlib import (	"fmt"	"path/filepath"	"runtime"	"strings" 	"github.com/rclone/rclone/fs") // ClipBlocks clips the blocks pointed to the OS maxfunc ClipBlocks(b *uint64) {	var max uint64	switch runtime.GOOS {	case "windows":		if runtime.GOARCH == "386" {			max = (1 << 32) - 1		} else {			max = (1 << 43) - 1		}	case "darwin":		// OSX FUSE only supports 32 bit number of blocks		// https://github.com/osxfuse/osxfuse/issues/396		max = (1 << 32) - 1	default:		// no clipping		return	}	if *b > max {		*b = max	}} // CheckOverlap checks that root doesn't overlap with mountpointfunc (m *MountPoint) CheckOverlap() error {	name := m.Fs.Name()	if name != "" && name != "local" {		return nil	}	rootAbs := absPath(m.Fs.Root())	mountpointAbs := absPath(m.MountPoint)	if strings.HasPrefix(rootAbs, mountpointAbs) || strings.HasPrefix(mountpointAbs, rootAbs) {		const msg = "mount point %q and directory to be mounted %q mustn't overlap"		return fmt.Errorf(msg, m.MountPoint, m.Fs.Root())	}	return nil} // absPath is a helper function for MountPoint.CheckOverlapfunc absPath(path string) string {	if abs, err := filepath.EvalSymlinks(path); err == nil {		path = abs	}	if abs, err := filepath.Abs(path); err == nil {		path = abs	}	path = filepath.ToSlash(path)	if !strings.HasSuffix(path, "/") {		path += "/"	}	return path} // CheckAllowings informs about ignored flags on Windows. If not on Windows// and not --allow-non-empty flag is used, verify that mountpoint is empty.func (m *MountPoint) CheckAllowings() error {	opt := &m.MountOpt	if runtime.GOOS == "windows" {		if opt.AllowNonEmpty {			fs.Logf(nil, "--allow-non-empty flag does nothing on Windows")		}		if opt.AllowRoot {			fs.Logf(nil, "--allow-root flag does nothing on Windows")		}		if opt.AllowOther {			fs.Logf(nil, "--allow-other flag does nothing on Windows")		}		return nil	}	if !opt.AllowNonEmpty {		return CheckMountEmpty(m.MountPoint)	}	return nil} // SetVolumeName with sensible defaultfunc (m *MountPoint) SetVolumeName(vol string) {	if vol == "" {		vol = m.Fs.Name() + ":" + m.Fs.Root()	}	m.MountOpt.SetVolumeName(vol)} // SetVolumeName removes special characters from volume name if necessaryfunc (o *Options) SetVolumeName(vol string) {	vol = strings.ReplaceAll(vol, ":", " ")	vol = strings.ReplaceAll(vol, "/", " ")	vol = strings.TrimSpace(vol)	if runtime.GOOS == "windows" && len(vol) > 32 {		vol = vol[:32]	}	o.VolumeName = vol}