mailingList.setPost(val);
                }
                // Archive
                org = mailingList.getArchive();
                val = interpolate(org);
                if (org != val) {
                    mailingList.setArchive(val);
                }
            }
        }

        private void visit(Prerequisites prerequisites) {

	prefixSize = 155 // Max length of the prefix field in USTAR format

	// Max length of a special file (PAX header, GNU long name or link).
	// This matches the limit used by libarchive.
	maxSpecialFileSize = 1 << 20
)

// blockPadding computes the number of bytes needed to pad offset up to the
// nearest block edge where 0 <= n < blockSize.
func blockPadding(offset int64) (n int64) {