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Date: Fri, 30 Nov 2018 19:39:02 -0500
From: Gabriel Krisman Bertazi <krisman@...labora.com>
To: tytso@....edu
Cc: kernel@...labora.com, linux-ext4@...r.kernel.org,
Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Subject: [PATCH v4 1/9] libe2p: Helpers for configuring the encoding superblock fields
From: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Implement helper functions to convert the encoding name and specific
parameters requested by the user on the command line into the format
that is written to disk.
Changes since v3:
- Don't require version at mkfs time
Changes since v2:
- Rename defines to add EXT4_ prefix
- Use unicode X.Y versioning scheme
Changes since v1:
- Drop struct ext4_encoding_map name.
- remove question mark in comment.
- Reword 0x0 -> NULL
- Prevent out of bound array access if requested invalid encoding
Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
---
lib/e2p/Makefile.in | 8 +++-
lib/e2p/e2p.h | 4 ++
lib/e2p/encoding.c | 104 +++++++++++++++++++++++++++++++++++++++++++
lib/ext2fs/ext2_fs.h | 7 +++
4 files changed, 121 insertions(+), 2 deletions(-)
create mode 100644 lib/e2p/encoding.c
diff --git a/lib/e2p/Makefile.in b/lib/e2p/Makefile.in
index 2b0aa1915130..68d534cdaf11 100644
--- a/lib/e2p/Makefile.in
+++ b/lib/e2p/Makefile.in
@@ -19,7 +19,8 @@ all:: e2p.pc
OBJS= feature.o fgetflags.o fsetflags.o fgetversion.o fsetversion.o \
getflags.o getversion.o hashstr.o iod.o ls.o ljs.o mntopts.o \
parse_num.o pe.o pf.o ps.o setflags.o setversion.o uuid.o \
- ostype.o percent.o crypto_mode.o fgetproject.o fsetproject.o
+ ostype.o percent.o crypto_mode.o fgetproject.o fsetproject.o \
+ encoding.o
SRCS= $(srcdir)/feature.c $(srcdir)/fgetflags.c \
$(srcdir)/fsetflags.c $(srcdir)/fgetversion.c \
@@ -29,7 +30,7 @@ SRCS= $(srcdir)/feature.c $(srcdir)/fgetflags.c \
$(srcdir)/pe.c $(srcdir)/pf.c $(srcdir)/ps.c \
$(srcdir)/setflags.c $(srcdir)/setversion.c $(srcdir)/uuid.c \
$(srcdir)/ostype.c $(srcdir)/percent.c $(srcdir)/crypto_mode.c \
- $(srcdir)/fgetproject.c $(srcdir)/fsetproject.c
+ $(srcdir)/fgetproject.c $(srcdir)/fsetproject.c $(srcdir)/encoding.c
HFILES= e2p.h
LIBRARY= libe2p
@@ -147,6 +148,9 @@ getversion.o: $(srcdir)/getversion.c $(top_builddir)/lib/config.h \
hashstr.o: $(srcdir)/hashstr.c $(top_builddir)/lib/config.h \
$(top_builddir)/lib/dirpaths.h $(srcdir)/e2p.h \
$(top_srcdir)/lib/ext2fs/ext2_fs.h $(top_builddir)/lib/ext2fs/ext2_types.h
+encoding.o: $(srcdir)/encoding.c $(top_builddir)/lib/config.h \
+ $(top_builddir)/lib/dirpaths.h $(srcdir)/e2p.h \
+ $(top_srcdir)/lib/ext2fs/ext2_fs.h $(top_builddir)/lib/ext2fs/ext2_types.h
iod.o: $(srcdir)/iod.c $(top_builddir)/lib/config.h \
$(top_builddir)/lib/dirpaths.h $(srcdir)/e2p.h \
$(top_srcdir)/lib/ext2fs/ext2_fs.h $(top_builddir)/lib/ext2fs/ext2_types.h
diff --git a/lib/e2p/e2p.h b/lib/e2p/e2p.h
index d70b59a5d358..cc2dbf39bfeb 100644
--- a/lib/e2p/e2p.h
+++ b/lib/e2p/e2p.h
@@ -80,3 +80,7 @@ unsigned int e2p_percent(int percent, unsigned int base);
const char *e2p_encmode2string(int num);
int e2p_string2encmode(char *string);
+
+int e2p_str2encoding(const char *string);
+int e2p_get_encoding_flags(int encoding);
+int e2p_str2encoding_flags(int encoding, char *param, __u16 *flags);
diff --git a/lib/e2p/encoding.c b/lib/e2p/encoding.c
new file mode 100644
index 000000000000..88433310a1dd
--- /dev/null
+++ b/lib/e2p/encoding.c
@@ -0,0 +1,104 @@
+/*
+ * encoding.c --- convert between encoding magic numbers and strings
+ *
+ * Copyright (C) 2018 Collabora Ltd.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "e2p.h"
+
+#define ARRAY_SIZE(array) \
+ (sizeof(array) / sizeof(array[0]))
+
+static const struct {
+ char *name;
+ __u16 encoding_magic;
+ __u16 default_flags;
+
+} ext4_encoding_map[] = {
+ {
+ .encoding_magic = EXT4_ENC_ASCII,
+ .name = "ascii",
+ .default_flags = 0
+ },
+ {
+ .encoding_magic = EXT4_ENC_UTF8_11_0,
+ .name = "utf8",
+ .default_flags = (EXT4_UTF8_NORMALIZATION_TYPE_NFKD |
+ EXT4_UTF8_CASEFOLD_TYPE_NFKDCF)
+ },
+};
+
+static const struct enc_flags {
+ __u16 flag;
+ char *param;
+} encoding_flags[] = {
+ { EXT4_ENC_STRICT_MODE_FL, "strict" },
+};
+
+/* Return a positive number < 0xff indicating the encoding magic number
+ * or a negative value indicating error. */
+int e2p_str2encoding(const char *string)
+{
+ int i;
+
+ for (i = 0 ; i < ARRAY_SIZE(ext4_encoding_map); i++)
+ if (!strcmp(string, ext4_encoding_map[i].name))
+ return ext4_encoding_map[i].encoding_magic;
+
+ return -EINVAL;
+}
+
+int e2p_get_encoding_flags(int encoding)
+{
+ int i;
+
+ for (i = 0 ; i < ARRAY_SIZE(ext4_encoding_map); i++)
+ if (ext4_encoding_map[i].encoding_magic == encoding)
+ return ext4_encoding_map[encoding].default_flags;
+
+ return 0;
+}
+
+int e2p_str2encoding_flags(int encoding, char *param, __u16 *flags)
+{
+ char *f = strtok(param, "-");
+ const struct enc_flags *fl;
+ int i, neg = 0;
+
+ while (f) {
+ neg = 0;
+ if (!strncmp("no", f, 2)) {
+ neg = 1;
+ f += 2;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(encoding_flags); i++) {
+ fl = &encoding_flags[i];
+ if (!strcmp(fl->param, f)) {
+ if (neg)
+ *flags &= ~fl->flag;
+ else
+ *flags |= fl->flag;
+
+ goto next_flag;
+ }
+ }
+ return -EINVAL;
+ next_flag:
+ f = strtok(NULL, "-");
+ }
+ return 0;
+}
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index f1c405b76339..c7d62b8d40b2 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -1127,4 +1127,11 @@ struct mmp_struct {
*/
#define EXT4_INLINE_DATA_DOTDOT_SIZE (4)
+#define EXT4_ENC_ASCII 0
+#define EXT4_ENC_UTF8_11_0 1
+
+#define EXT4_ENC_STRICT_MODE_FL (1 << 0) /* Reject invalid sequences */
+#define EXT4_UTF8_NORMALIZATION_TYPE_NFKD (1 << 1)
+#define EXT4_UTF8_CASEFOLD_TYPE_NFKDCF (1 << 4)
+
#endif /* _LINUX_EXT2_FS_H */
--
2.20.0.rc1
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