Ignore size of directories with regular type

In old tar formats directories are specified by appending a slash to
their names.

Directories may have sizes, but they do not have data blocks. Keep this
in mind and avoid skipping data blocks when encountering directories.

Author: ferivoz

libarchive/archive_read_support_format_tar.c

@@ -573,11 +573,15 @@ archive_read_format_tar_read_header(struct archive_read *a,
 			l = wcslen(wp);
 			if (l > 0 && wp[l - 1] == L'/') {
 				archive_entry_set_filetype(entry, AE_IFDIR);
+				tar->entry_bytes_remaining = 0;
+				tar->entry_padding = 0;
 			}
 		} else if ((p = archive_entry_pathname(entry)) != NULL) {
 			l = strlen(p);
 			if (l > 0 && p[l - 1] == '/') {
 				archive_entry_set_filetype(entry, AE_IFDIR);
+				tar->entry_bytes_remaining = 0;
+				tar->entry_padding = 0;
 			}
 		}
 	}