C7encode

c7encode is a Unix-centric binary-to-text encoding utility and format. The companion decoder utility is c7decode.

Quoting from Cnews's NEWSBATCH(8) man page:

C7encode encodes 8-bit data from standard input into a 7-bit form optimized for transmission by uucp ‘f’ protocol. The encoding is complex and bizarre.

Software

 * Slackware 4.0: source/n/cnews/ → Various files, e.g. c-news.tar.gz → c7encode.c, c7decode.c