f2fs-tools: improve filename printing

- Make buffers for pretty-printed filenames 341 bytes long, long enough
  for 255 (NAME_MAX) base64-encoded bytes.  Then print encrypted
  filenames in full, base64-encoded.  This will be useful for tests I'm
  writing which verify the correct ciphertext is stored on-disk.

- Rename convert_encrypted_name() to pretty_print_filename(), to make it
  clear that it handles unencrypted names too.  Also make the output
  'char' rather than 'unsigned char', as it's for printing; and remove
  the unnecessary return value.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index b4f992f..f0d2bcf 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -721,6 +721,10 @@ struct f2fs_extent {
 } __attribute__((packed));
 
 #define F2FS_NAME_LEN		255
+
+/* max output length of pretty_print_filename() including null terminator */
+#define F2FS_PRINT_NAMELEN	(4 * ((F2FS_NAME_LEN + 2) / 3) + 1)
+
 /* 200 bytes for inline xattrs by default */
 #define DEFAULT_INLINE_XATTR_ADDRS	50
 #define DEF_ADDRS_PER_INODE	923	/* Address Pointers in an Inode */