Validate restored file paths against their nominal domain

            basePath = getCacheDir().getCanonicalPath();

        } else {

            // Not a supported location

            Log.i(TAG, "Data restored from non-app domain " + domain + ", ignoring");

            Log.i(TAG, "Unrecognized domain " + domain);

        }

        // Now that we've figured out where the data goes, send it on its way

        if (basePath != null) {

            // Canonicalize the nominal path and verify that it lies within the stated domain

            File outFile = new File(basePath, path);

            if (DEBUG) Log.i(TAG, "[" + domain + " : " + path + "] mapped to " + outFile.getPath());

            String outPath = outFile.getCanonicalPath();

            if (outPath.startsWith(basePath + File.separatorChar)) {

                if (DEBUG) Log.i(TAG, "[" + domain + " : " + path + "] mapped to " + outPath);

                onRestoreFile(data, size, outFile, type, mode, mtime);

                return;

            } else {

            // Not a supported output location?  We need to consume the data

                // Attempt to restore to a path outside the file's nominal domain.

                if (DEBUG) {

                    Log.e(TAG, "Cross-domain restore attempt: " + outPath);

                }

            }

        }

        // Not a supported output location, or bad path:  we need to consume the data

        // anyway, so just use the default "copy the data out" implementation

        // with a null destination.

            if (DEBUG) Log.i(TAG, "[ skipping data from unsupported domain " + domain + "]");

        if (DEBUG) Log.i(TAG, "[ skipping file " + path + "]");

        FullBackup.restoreFile(data, size, type, mode, mtime, null);

    }

    }

    // ----- Core implementation -----