Fix issue #221

In function sqlite3mc_initialize() the encryption VFS shim was added to the default VFS unconditionally. However, this fails if no default VFS is configured. Now it is first checked whether a default VFS is configured. Only then the encryption VFS shim is applied, so that sqlite3mc_initialize() does not fail.

Author: utelle

src/sqlite3mc.c

@@ -702,7 +702,12 @@ sqlite3mc_initialize(const char* arg)
   */
   if (rc == SQLITE_OK)
   {
-    rc = sqlite3mc_vfs_create(NULL, 1);
+    /* Check whether a default VFS is configured */
+    if (sqlite3_vfs_find(NULL))
+    {
+      /* Add encryption VFS shim to default VFS */
+      rc = sqlite3mc_vfs_create(NULL, 1);
+    }
   }
   return rc;
 }