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Date: Mon, 15 Oct 2018 17:12:14 -0400
From: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org,
Gabriel Krisman Bertazi <krisman@...labora.co.uk>
Subject: [PATCH e2fsprogs 3/9] libe2p: Helpers for configuring the encoding superblock fields
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.
Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.co.uk>
---
lib/e2p/Makefile.in | 8 +++--
lib/e2p/e2p.h | 4 +++
lib/e2p/encoding.c | 76 ++++++++++++++++++++++++++++++++++++++++++++
lib/ext2fs/ext2_fs.h | 13 ++++++++
4 files changed, 99 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..c39074abe8eb 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);
+const char *e2p_encoding2str(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..6904db73b94c
--- /dev/null
+++ b/lib/e2p/encoding.c
@@ -0,0 +1,76 @@
+/*
+ * 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"
+
+static const struct enc_flags {
+ __u16 flag;
+ char *param;
+} encoding_flags[] = {
+ { EXT4_ENC_STRICT_MODE_FL, "strict" },
+ {0, NULL},
+};
+
+/* 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 ; ext4_encoding_map[i].name; i++)
+ if (!strcmp(string, ext4_encoding_map[i].name))
+ return i;
+
+ return -EINVAL;
+}
+
+const char *e2p_encoding2str(int encoding)
+{
+ return ext4_encoding_map[encoding].name;
+}
+
+int e2p_str2encoding_flags(int encoding, char *param, __u16 *flags)
+{
+ char *f = strtok(param, "-");
+ const struct enc_flags *fl;
+ int neg = 0;
+
+ while (f) {
+ neg = 0;
+ if (!strncmp ("no", f, 2)) {
+ neg = 1;
+ f += 2;
+ }
+
+ for (fl = encoding_flags; fl->param; fl++) {
+ 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..df8ced088f38 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -1127,4 +1127,17 @@ struct mmp_struct {
*/
#define EXT4_INLINE_DATA_DOTDOT_SIZE (4)
+#define EXT4_ENC_STRICT_MODE_FL (1 << 0) /* Reject invalid sequences? */
+#define UTF8_NORMALIZATION_TYPE_NFKD (1 << 1)
+#define UTF8_CASEFOLD_TYPE_NFKDCF (1 << 4)
+
+static const struct ext4_sb_encoding_map {
+ char *name;
+ __u16 default_flags;
+} ext4_encoding_map[] = {
+ /* 0x0 */ { "ascii", 0x0},
+ /* 0x1 */ {"utf8-10.0.0", UTF8_NORMALIZATION_TYPE_NFKD|UTF8_CASEFOLD_TYPE_NFKDCF},
+ {0x0, 0x0},
+};
+
#endif /* _LINUX_EXT2_FS_H */
--
2.19.1
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