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;;; guile-email --- Guile email parser
;;; Copyright © 2018 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of guile-email.
;;;
;;; guile-email is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU Affero General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; guile-email is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with guile-email. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (email quoted-printable)
#:use-module (rnrs)
#:use-module (ice-9 match)
#:export (quoted-printable-decode
q-encoding-decode))
;; TODO: Error out on invalid quoted-printable input
(define quoted-printable-decode
(match-lambda*
(((? string? str))
(call-with-input-string str quoted-printable-decode))
(((? port? in))
(let-values (((out get-bytevector)
(open-bytevector-output-port)))
(quoted-printable-decode in out)
(get-bytevector)))
(((? port? in) (? port? out))
(let ((c (read-char in)))
(cond
((eof-object? c)
out)
((char=? c #\=)
;; TODO: Support "\r\n" line ending
(let ((c1 (read-char in)))
(unless (char=? c1 #\Newline)
(let ((c2 (read-char in)))
(put-u8 out (string->number (string c1 c2) 16)))))
(quoted-printable-decode in out))
(#t
(put-u8 out (char->integer c))
(quoted-printable-decode in out)))))))
(define (q-encoding-decode str)
(quoted-printable-decode
(string-map
(lambda (c)
(if (char=? c #\_) #\Space c))
str)))
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