Container for commonly used Base64 variants:
This variant is what most people would think of "the standard"
See wikipedia Base64 entry for details.
Note that although this can be thought of as the standard variant,
it is not the default for Jackson: no-linefeeds alternative
is because of JSON requirement of escaping all linefeeds.
Slightly non-standard modification of
which does not
use linefeeds (max line length set to infinite). Useful when linefeeds
wouldn't work well (possibly in attributes), or for minor space savings
(save 1 linefeed per 76 data chars, ie. ~1.4% savings).
This variant is the one that predates
: it is otherwise
identical, except that it mandates shorter line length.
This non-standard variant is usually used when encoded data needs to be
passed via URLs (such as part of GET request). It differs from the
variant in multiple ways.
First, no padding is used: this also means that it generally can not
be written in multiple separate but adjacent chunks (which would not
be the usual use case in any case). Also, no linefeeds are used (max
line length set to infinite). And finally, two characters (plus and
slash) that would need quoting in URLs are replaced with more
optimal alternatives (hyphen and underscore, respectively).
Method used to get the default variant ("MIME_NO_LINEFEEDS") for cases
where caller does not explicitly specify the variant.
We will prefer no-linefeed version because linefeeds in JSON values
must be escaped, making linefeed-containing variants sub-optimal.