reverse: add skeleton

Compiles but does not do much else.

1 files changed, 56 insertions, 0 deletions

diff --git a/internal/fusefrontend_reverse/rpath.go b/internal/fusefrontend_reverse/rpath.go
new file mode 100644
index 0000000..9377958
--- /dev/null
+++ b/internal/fusefrontend_reverse/rpath.go
@@ -0,0 +1,56 @@
+package fusefrontend_reverse
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+func (fs *FS) abs(relPath string, err error) (string, error) {
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(fs.args.Cipherdir, relPath), nil
+}
+
+const (
+	ENCRYPT = iota
+	DECRYPT
+)
+
+func (fs *FS) encryptPath(relPath string) (string, error) {
+	return fs.transformPath(relPath, ENCRYPT)
+}
+
+func (fs *FS) decryptPath(relPath string) (string, error) {
+	return fs.transformPath(relPath, DECRYPT)
+}
+
+func (fs *FS) transformPath(relPath string, direction int) (string, error) {
+	if fs.args.PlaintextNames {
+		return relPath, nil
+	}
+	var err error
+	var transformedParts []string
+	iv := make([]byte, 16)
+	parts := strings.Split(relPath, "/")
+	for _, part := range parts {
+		var transformedPart string
+		switch direction {
+		case ENCRYPT:
+			transformedPart = fs.nameTransform.EncryptName(part, iv)
+		case DECRYPT:
+			transformedPart, err = fs.nameTransform.DecryptName(part, iv)
+			if err != nil {
+				return "", err
+			}
+		default:
+			panic("bug: invalid direction value")
+		}
+		transformedParts = append(transformedParts, transformedPart)
+	}
+	return filepath.Join(transformedParts...), nil
+}
+
+func (fs *FS) isFiltered(relPath string) bool {
+	return false
+}