Description Usage Arguments Value Description Base64 Author(s) Examples

`sxtMap`

maps 6-character bit patterns to their corresponding Base64
characters (an "sextet"), or characters back to bit patterns.

1 | ```
sxtMap(x)
``` |

`x` |
(character or numeric) A vector of encoding characters, bit-patterns
or indices. Note: indices are vector indices, not interpreted bit-patterns,
i.e |

(character) A vector of Base 64 characters or their corresponding bit-patterns.

If the input is a vector of 6-character bit patterns,
`sxtMap`

returns the corresponding character from the Base64
binary-to-text encoding. If the input is a vector of 1-character strings
`sxtMap`

returns the corresponding bit pattern. If the input is
numeric, it is interpreted as indices into the sxt vector. The returned
vector has the same length as the input but no checking for valid input is
done.

Base64 is a binary to text encoding specified in
RFC 1738; we use the URL and
filename-safe alphabet version with the following encoding from
`000000`

to `111111`

:
`"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"`

This is safe for most applications; one exception is Microsoft Excel where
strings that begin with a `"-"`

are silently convert to formulas.
(QQIDs are not affected by this problem since they always begin with
a lowercase alphabetic character.)

(c) 2019 Boris Steipe,
licensed under MIT (see file `LICENSE`

in this package).

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