fs: exfat: Import libexfat from fuse-exfat
Import most of libexfat from [1] except for log.c verbatim. The code
does not even compile and further adjustments and integration into
U-Boot filesystem code is in the next patch.
[1] https://github.com/relan/exfat
0b41c6d3560d ("CI: bump FreeBSD to 13.1.")
Acked-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/fs/exfat/repair.c b/fs/exfat/repair.c
new file mode 100644
index 0000000..615b8d1
--- /dev/null
+++ b/fs/exfat/repair.c
@@ -0,0 +1,102 @@
+/*
+ repair.c (09.03.17)
+ exFAT file system implementation library.
+
+ Free exFAT implementation.
+ Copyright (C) 2010-2023 Andrew Nayenko
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "exfat.h"
+#include <strings.h>
+
+int exfat_errors_fixed;
+
+bool exfat_ask_to_fix(const struct exfat* ef)
+{
+ const char* question = "Fix (Y/N)?";
+ char answer[8];
+ bool yeah, nope;
+
+ switch (ef->repair)
+ {
+ case EXFAT_REPAIR_NO:
+ return false;
+ case EXFAT_REPAIR_YES:
+ printf("%s %s", question, "Y\n");
+ return true;
+ case EXFAT_REPAIR_ASK:
+ do
+ {
+ printf("%s ", question);
+ fflush(stdout);
+ if (fgets(answer, sizeof(answer), stdin))
+ {
+ yeah = strcasecmp(answer, "Y\n") == 0;
+ nope = strcasecmp(answer, "N\n") == 0;
+ }
+ else
+ {
+ yeah = false;
+ nope = true;
+ }
+ }
+ while (!yeah && !nope);
+ return yeah;
+ }
+ exfat_bug("invalid repair option value: %d", ef->repair);
+}
+
+bool exfat_fix_invalid_vbr_checksum(const struct exfat* ef, void* sector,
+ uint32_t vbr_checksum)
+{
+ size_t i;
+ off_t sector_size = SECTOR_SIZE(*ef->sb);
+
+ for (i = 0; i < sector_size / sizeof(vbr_checksum); i++)
+ ((le32_t*) sector)[i] = cpu_to_le32(vbr_checksum);
+ if (exfat_pwrite(ef->dev, sector, sector_size, 11 * sector_size) < 0)
+ {
+ exfat_error("failed to write correct VBR checksum");
+ return false;
+ }
+ exfat_errors_fixed++;
+ return true;
+}
+
+bool exfat_fix_invalid_node_checksum(UNUSED const struct exfat* ef,
+ struct exfat_node* node)
+{
+ /* checksum will be rewritten by exfat_flush_node() */
+ node->is_dirty = true;
+
+ exfat_errors_fixed++;
+ return true;
+}
+
+bool exfat_fix_unknown_entry(struct exfat* ef, struct exfat_node* dir,
+ const struct exfat_entry* entry, off_t offset)
+{
+ struct exfat_entry deleted = *entry;
+
+ deleted.type &= ~EXFAT_ENTRY_VALID;
+ if (exfat_generic_pwrite(ef, dir, &deleted, sizeof(struct exfat_entry),
+ offset) != sizeof(struct exfat_entry))
+ return false;
+
+ exfat_errors_fixed++;
+ return true;
+}