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Date: Thu, 5 Nov 2020 17:16:36 +0100
From: Arnaud Ferraris <arnaud.ferraris@...labora.com>
To: linux-ext4@...r.kernel.org
Cc: Gabriel Krisman Bertazi <krisman@...labora.com>,
Arnaud Ferraris <arnaud.ferraris@...labora.com>
Subject: [PATCH 04/11] ext2fs: Implement faster CI comparison of strings
From: Gabriel Krisman Bertazi <krisman@...labora.com>
Instead of calling casefold two times and memcmp the result, which
require allocating a temporary buffer for the casefolded version, add a
strcasecmp-like method to perform the comparison of each code-point
during the casefold itself.
This method is exposed because it needs to be used directly by fsck.
Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
---
lib/ext2fs/ext2fs.h | 4 ++++
lib/ext2fs/ext2fsP.h | 4 ++++
lib/ext2fs/nls_utf8.c | 33 +++++++++++++++++++++++++++++++++
3 files changed, 41 insertions(+)
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 4065cb70..9e96ca5c 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1615,6 +1615,10 @@ extern errcode_t ext2fs_new_dir_inline_data(ext2_filsys fs, ext2_ino_t dir_ino,
extern const struct ext2fs_nls_table *ext2fs_load_nls_table(int encoding);
extern int ext2fs_check_encoded_name(const struct ext2fs_nls_table *table,
char *s, size_t len, char **pos);
+extern int ext2fs_casefold_cmp(const struct ext2fs_nls_table *table,
+ const unsigned char *str1, size_t len1,
+ const unsigned char *str2, size_t len2);
+
/* mkdir.c */
extern errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
diff --git a/lib/ext2fs/ext2fsP.h b/lib/ext2fs/ext2fsP.h
index 30564ded..99239be0 100644
--- a/lib/ext2fs/ext2fsP.h
+++ b/lib/ext2fs/ext2fsP.h
@@ -106,6 +106,10 @@ struct ext2fs_nls_ops {
unsigned char *dest, size_t dlen);
int (*validate)(const struct ext2fs_nls_table *table,
char *s, size_t len, char **pos);
+ int (*casefold_cmp)(const struct ext2fs_nls_table *table,
+ const unsigned char *str1, size_t len1,
+ const unsigned char *str2, size_t len2);
+
};
/* Function prototypes */
diff --git a/lib/ext2fs/nls_utf8.c b/lib/ext2fs/nls_utf8.c
index 903c65ba..1c444ca2 100644
--- a/lib/ext2fs/nls_utf8.c
+++ b/lib/ext2fs/nls_utf8.c
@@ -942,9 +942,36 @@ static int utf8_validate(const struct ext2fs_nls_table *table,
return 0;
}
+static int utf8_casefold_cmp(const struct ext2fs_nls_table *table,
+ const unsigned char *str1, size_t len1,
+ const unsigned char *str2, size_t len2)
+{
+ const struct utf8data *data = utf8nfdicf(table->version);
+ int c1, c2;
+ struct utf8cursor cur1, cur2;
+
+ if (utf8ncursor(&cur1, data, (const char *) str1, len1) < 0)
+ return -1;
+ if (utf8ncursor(&cur2, data, (const char *) str2, len2) < 0)
+ return -1;
+
+ do {
+ c1 = utf8byte(&cur1);
+ c2 = utf8byte(&cur2);
+
+ if (c1 < 0 || c2 < 0)
+ return -1;
+ if (c1 != c2)
+ return c1 - c2;
+ } while (c1);
+
+ return 0;
+}
+
static const struct ext2fs_nls_ops utf8_ops = {
.casefold = utf8_casefold,
.validate = utf8_validate,
+ .casefold_cmp = utf8_casefold_cmp,
};
static const struct ext2fs_nls_table nls_utf8 = {
@@ -965,3 +992,9 @@ int ext2fs_check_encoded_name(const struct ext2fs_nls_table *table,
{
return table->ops->validate(table, name, len, pos);
}
+int ext2fs_casefold_cmp(const struct ext2fs_nls_table *table,
+ const unsigned char *str1, size_t len1,
+ const unsigned char *str2, size_t len2)
+{
+ return table->ops->casefold_cmp(table, str1, len1, str2, len2);
+}
--
2.28.0
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