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+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * internal.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef FSTREE_INTERNAL_H
+#define FSTREE_INTERNAL_H
+
+#include "config.h"
+#include "fstree.h"
+
+/* ASCIIbetically sort a linked list of tree nodes */
+tree_node_t *tree_node_list_sort(tree_node_t *head);
+
+/*
+ If the environment variable SOURCE_DATE_EPOCH is set to a parsable number
+ that fits into an unsigned 32 bit value, return its value. Otherwise,
+ default to 0.
+ */
+sqfs_u32 get_source_date_epoch(void);
+
+#endif /* FSTREE_INTERNAL_H */