1 files changed, 38 insertions, 0 deletions
diff --git a/include/util/util.h b/include/util/util.h
new file mode 100644
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--- /dev/null
+++ b/include/util/util.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * util.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef SQFS_UTIL_H
+#define SQFS_UTIL_H
+
+#include "config.h"
+#include "sqfs/predef.h"
+#include "compat.h"
+
+#include <stddef.h>
+
+/*
+  Helper for allocating data structures with flexible array members.
+
+  'base_size' is the size of the struct itself, 'item_size' the size of a
+  single array element and 'nmemb' the number of elements.
+
+  Iternally checks for arithmetic overflows when allocating the combined thing.
+ */
+SQFS_INTERNAL
+void *alloc_flex(size_t base_size, size_t item_size, size_t nmemb);
+
+/* Basically the same as calloc, but *ALWAYS* does overflow checking */
+SQFS_INTERNAL
+void *alloc_array(size_t item_size, size_t nmemb);
+
+SQFS_INTERNAL sqfs_u32 xxh32(const void *input, const size_t len);
+
+/*
+  Returns true if the given region of memory is filled with zero-bytes only.
+ */
+SQFS_INTERNAL bool is_memory_zero(const void *blob, size_t size);
+
+#endif /* SQFS_UTIL_H */