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diff --git a/fs/smb/server/unicode.h b/fs/smb/server/unicode.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Some of the source code in this file came from fs/cifs/cifs_unicode.c
+ * cifs_unicode: Unicode kernel case support
+ *
+ * Function:
+ * Convert a unicode character to upper or lower case using
+ * compressed tables.
+ *
+ * Copyright (c) International Business Machines Corp., 2000,2009
+ *
+ *
+ * Notes:
+ * These APIs are based on the C library functions. The semantics
+ * should match the C functions but with expanded size operands.
+ *
+ * The upper/lower functions are based on a table created by mkupr.
+ * This is a compressed table of upper and lower case conversion.
+ *
+ */
+#ifndef _SMB_UNICODE_H
+#define _SMB_UNICODE_H
+
+#include <asm/byteorder.h>
+#include <linux/types.h>
+#include <linux/nls.h>
+#include <linux/unicode.h>
+#include "../../nls/nls_ucs2_utils.h"
+
+#ifdef __KERNEL__
+int smb_strtoUTF16(__le16 *to, const char *from, int len,
+ const struct nls_table *codepage);
+char *smb_strndup_from_utf16(const char *src, const int maxlen,
+ const bool is_unicode,
+ const struct nls_table *codepage);
+int smbConvertToUTF16(__le16 *target, const char *source, int srclen,
+ const struct nls_table *cp, int mapchars);
+char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename);
+#endif
+
+#endif /* _SMB_UNICODE_H */