Xxencoding (xxencode, xxdecode) is a way to encode binary data as plain text. It is very similar to uuencoding, but with an alphabet of 64 symbols, instead of 32.
The header line starts with "
begin", followed by a Unix file permission code and a filename.
Each line of data begins with a character indicating the line length. Since lines have a standard length, all lines except the last one begin with "
It's not necessarily easy to distinguish xxencoded data from uuencoded data in a completely reliable way.