Improve storage, paths

CHDataManagement/Storage/StorageAccessError.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+enum StorageAccessError: Error {
+
+    case noBookmarkData
+
+    case bookmarkDataCorrupted(Error)
+
+    case folderAccessFailed(URL)
+
+    case stringConversionFailed
+
+    case fileNotFound(String)
+
+}
+
+extension StorageAccessError: CustomStringConvertible {
+
+    var description: String {
+        switch self {
+        case .noBookmarkData:
+            return "No bookmark data to access resources in folder"
+        case .bookmarkDataCorrupted(let error):
+            return "Failed to resolve bookmark: \(error)"
+        case .folderAccessFailed(let url):
+            return "Failed to access folder: \(url.path())"
+        case .stringConversionFailed:
+            return "Failed to convert string to data"
+        case .fileNotFound(let path):
+            return "File not found: \(path)"
+        }
+    }
+}