include (untested) hash

c/hash.c

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*  inspired from kernel's <fs/namei.h>
+ */
+#include "hash.h"
+
+/* Return the hash of a string of known length */
+unsigned int full_name_hash(const void *salt, const char *name, unsigned int len)
+{
+	unsigned long hash = init_name_hash(salt);
+	while (len--)
+		hash = partial_name_hash((unsigned char)*name++, hash);
+	return end_name_hash(hash);
+}
+
+/* Return the "hash_len" (hash and length) of a null-terminated string */
+u64 hashlen_string(const void *salt, const char *name)
+{
+	unsigned long hash = init_name_hash(salt);
+	unsigned long len = 0, c;
+
+	c = (unsigned char)*name;
+	while (c) {
+		len++;
+		hash = partial_name_hash(c, hash);
+		c = (unsigned char)name[len];
+	}
+	return hashlen_create(end_name_hash(hash), len);
+}