longnames: use symbolic constants instead of naked ints

internal/fusefrontend/fs_dir.go

@@ -207,21 +207,22 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
 
 		if fs.args.LongNames {
 			isLong := nametransform.IsLongName(cName)
-			if isLong == 1 {
+			if isLong == nametransform.LongNameContent {
 				cNameLong, err := nametransform.ReadLongName(filepath.Join(cDirAbsPath, cName))
 				if err != nil {
 					toggledlog.Warn.Printf("Could not read long name for file %s, skipping file", cName)
 					continue
 				}
 				cName = cNameLong
-			} else if isLong == 2 {
+			} else if isLong == nametransform.LongNameFilename {
 				// ignore "gocryptfs.longname.*.name"
 				continue
 			}
 		}
 		name, err := fs.nameTransform.DecryptName(cName, cachedIV)
 		if err != nil {
-			toggledlog.Warn.Printf("Skipping invalid name '%s' in dir '%s': %s", cName, cDirName, err)
+			toggledlog.Warn.Printf("Skipping invalid name '%s' in dir '%s': %s",
+				cName, cDirName, err)
 			continue
 		}
 

internal/nametransform/longnames.go

@@ -25,18 +25,25 @@ func HashLongName(name string) string {
 	return longNamePrefix + hashBase64
 }
 
+// Values returned by IsLongName
+const (
+	LongNameContent  = iota
+	LongNameFilename = iota
+	LongNameNone     = iota
+)
+
 // IsLongName - detect if cName is
-// gocryptfs.longname.* ........ 1
+// gocryptfs.longname.[sha256]  ........ LongNameContent (content of a long name file)
-// gocryptfs.longname.*.name ... 2
+// gocryptfs.longname.[sha256].name .... LongNameFilename (full file name of a long name file)
-// else ........................ 0
+// else ................................ LongNameNone (normal file)
 func IsLongName(cName string) int {
 	if !strings.HasPrefix(cName, longNamePrefix) {
-		return 0
+		return LongNameNone
 	}
 	if strings.HasSuffix(cName, longNameSuffix) {
-		return 2
+		return LongNameFilename
 	}
-	return 1
+	return LongNameContent
 }
 
 // ReadLongName - read path.name
@@ -51,7 +58,7 @@ func ReadLongName(path string) (string, error) {
 // DeleteLongName - if cPath ends in "gocryptfs.longname.[sha256]",
 // delete the "gocryptfs.longname.[sha256].name" file
 func DeleteLongName(cPath string) error {
-	if IsLongName(filepath.Base(cPath)) == 1 {
+	if IsLongName(filepath.Base(cPath)) == LongNameContent {
 		err := syscall.Unlink(cPath + longNameSuffix)
 		if err != nil {
 			toggledlog.Warn.Printf("DeleteLongName: %v", err)
@@ -65,7 +72,7 @@ func DeleteLongName(cPath string) error {
 // "gocryptfs.longname.[sha256].name" file
 func (n *NameTransform) WriteLongName(cPath string, plainPath string) (err error) {
 	cHashedName := filepath.Base(cPath)
-	if IsLongName(cHashedName) != 1 {
+	if IsLongName(cHashedName) != LongNameContent {
 		// This is not a hashed file name, nothing to do
 		return nil
 	}

internal/nametransform/longnames_test.go

@@ -6,17 +6,17 @@ import (
 
 func TestIsLongName(t *testing.T) {
 	n := "gocryptfs.longname.LkwUdALvV_ANnzQN6ZZMYnxxfARD3IeZWCKnxGJjYmU=.name"
-	if IsLongName(n) != 2 {
+	if IsLongName(n) != LongNameFilename {
 		t.Errorf("False negative")
 	}
 
 	n = "gocryptfs.longname.LkwUdALvV_ANnzQN6ZZMYnxxfARD3IeZWCKnxGJjYmU="
-	if IsLongName(n) != 1 {
+	if IsLongName(n) != LongNameContent {
 		t.Errorf("False negative")
 	}
 
 	n = "LkwUdALvV_ANnzQN6ZZMYnxxfARD3IeZWCKnxGJjYmU="
-	if IsLongName(n) != 0 {
+	if IsLongName(n) != LongNameNone {
 		t.Errorf("False positive")
 	}
 }