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Date:   Tue,  3 Jul 2018 13:06:49 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.co.uk>
To:     tytso@....edu
Cc:     linux-ext4@...r.kernel.org, darrick.wong@...cle.com,
        kernel@...labora.com,
        Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Subject: [PATCH 09/20] nls: Add optional normalization and casefold hooks

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
---
 include/linux/nls.h | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/include/linux/nls.h b/include/linux/nls.h
index deca7367feb8..7f95a1bd8e1f 100644
--- a/include/linux/nls.h
+++ b/include/linux/nls.h
@@ -4,6 +4,7 @@
 
 #include <linux/init.h>
 #include <linux/string.h>
+#include <linux/errno.h>
 
 /* Unicode has changed over the years.  Unicode code points no longer
  * fit into 16 bits; as of Unicode 5 valid code points range from 0
@@ -38,7 +39,12 @@ struct nls_ops {
 				   unsigned int c);
 	unsigned char (*uppercase)(const struct nls_table *charset,
 				   unsigned int c);
-
+	int (*casefold)(const struct nls_table *charset,
+			const unsigned char *str, size_t len,
+			unsigned char *dest, size_t dlen);
+	int (*normalize)(const struct nls_table *charset,
+			 const unsigned char *str, size_t len,
+			 unsigned char *dest, size_t dlen);
 };
 
 struct nls_table {
@@ -157,6 +163,26 @@ static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
 	return nls_strncasecmp(t, s1, len, s2, len);
 }
 
+static inline int nls_casefold(const struct nls_table *charset,
+			       const unsigned char *str, size_t len,
+			       unsigned char *dest, size_t dlen)
+{
+	if (charset->ops->casefold)
+		return charset->ops->casefold(charset, str, len, dest, dlen);
+
+	return -ENOTSUPP;
+}
+
+static inline int nls_normalize(const struct nls_table *charset,
+				const unsigned char *str, size_t len,
+				unsigned char *dest, size_t dlen)
+{
+	if (charset->ops->normalize)
+		return charset->ops->normalize(charset, str, len, dest, dlen);
+
+	return -ENOTSUPP;
+}
+
 /*
  * nls_nullsize - return length of null character for codepage
  * @codepage - codepage for which to return length of NULL terminator
-- 
2.18.0

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