Base64 encoding

Base64 is an encoding scheme to represent binary data using only printable graphic characters. The scheme is applied to uuencode/uudecode. The following functions are defined in lib/llib/base64.l.

base64encode binstr [function]

A binary string, binstr is converted to an ASCII string consisting only of

$$A-Za-z0-9+/=$$

letters according to the base-64 encoding rule. The resulted string is 33% longer than the original. A newline is inserted every 76 characters. One or two '=' characters are padded at the end to adjust the length of the result to be a multiple of four.

base64decode ascstr [function]

An ASCII string, ascstr, is converted to a binary string according to the base-64 encodeing. Error is reported if ascstr includes an invalid character.