Encode and decode mailbox names in IMAP modified UTF-7

IMAP mailbox names are transmitted in the modified UTF-7 encoding of RFC 3501 (section 5.1.3): non-ASCII runs are written as &<base64>-, where the base64 alphabet uses , instead of / and carries no padding, and a literal & is written &-. mRpostman applies the encoding to every folder name it sends and decodes the names it receives, so folders can be referred to by their real (UTF-8) names; these helpers are exported for users who handle raw names.

Usage

imap_utf7_encode(x)

imap_utf7_decode(x)

Arguments

x

A character vector of mailbox names.

Value

A character vector of the same length.

Examples

imap_utf7_encode("École")   # "&AMk-cole"
#> [1] "&AMk-cole"
imap_utf7_decode("&AMk-cole")    # "École"
#> [1] "École"
imap_utf7_encode("Q&A")          # "Q&-A"
#> [1] "Q&-A"