feat(std/encoding): add ascii85 module #6711
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Custom implementation of ascii85 supporting multiple standards. Defaults to Adobe variant with no delimeter, since it's used by the Go standard library implementation (and probably most popular).
Additionally it can use btoa version, which can compress a couple characters more (four "spaces", that is bytes equal to 32, compress into a single "y" character), though there is no support for checksums added by btoa program at the end of a message with delimeters.
Since both of these can be hard to use in a string literal - since their characterset contains characters that need to be escaped (for example both quotation mark characters -
'and") there are also two standards that should be safer to use - Z85 and RFC 1924 (while it's an April Fools' Day RFC and the standard is not the best idea for storing IPv6, the characterset used by this encoding is better for use in string literals since it excludes characters that might need to be escaped in JS/TS).There is also support for adding delimeters in the
encodefunction -<~and~>for Adobe variant andxbota Beginandxbtoa Endfor btoa. Other standards don't define any delimeter, so none is used even if the option is specified.