Btoa Version
The original btoa program always encoded full groups (padding the source as necessary), with a prefix line of "xbtoa Begin", and suffix line of "xbtoa End", followed by the original file length (in decimal and hexadecimal) and three 32-bit checksums. The decoder needs to use the file length to see how much of the group was padding. This program also introduced the special "z" short form for an all-zero group. Version 4.2 added a "y" exception for a group of all ASCII space characters (0x20202020).
Read more about this topic: Ascii85
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