-bool sparse_file_p (struct tar_stat_info *stat);
-enum dump_status sparse_dump_file (int fd, struct tar_stat_info *stat);
-enum dump_status sparse_extract_file (int fd, struct tar_stat_info *stat, off_t *size);
-bool sparse_diff_file (int fd, struct tar_stat_info *stat);
+bool sparse_file_p (struct tar_stat_info *);
+bool sparse_member_p (struct tar_stat_info *);
+bool sparse_fixup_header (struct tar_stat_info *);
+enum dump_status sparse_dump_file (int, struct tar_stat_info *);
+enum dump_status sparse_extract_file (int, struct tar_stat_info *, off_t *);
+enum dump_status sparse_skip_file (struct tar_stat_info *);
+bool sparse_diff_file (int, struct tar_stat_info *);
+
+/* Module utf8.c */
+bool string_ascii_p (const char *str);
+bool utf8_convert (bool to_utf, char const *input, char **output);