/usr/share/gauche-0.9/0.9.1/lib/rfc/quoted-printable.scm is in gauche 0.9.1-5.
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;;; quoted-printable.scm - quoted-printable encoding/decoding routine
;;;
;;; Copyright (c) 2000-2010 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;; Ref: RFC2045 section 6.7 <http://www.rfc-editor.org/rfc/rfc2045.txt>
(define-module rfc.quoted-printable
(export quoted-printable-encode quoted-printable-encode-string
quoted-printable-decode quoted-printable-decode-string)
)
(select-module rfc.quoted-printable)
;; The minimum line width is 4, since one encoded octed and one soft
;; line break requires 4 characters.
;; If binary is #f, we encode CR and LF. See RFC2045 for this consideration.
(define (quoted-printable-encode :key (line-width 76) (binary #f))
(let1 limit (if (and line-width (>= line-width 4)) (- line-width 3) #f)
(let loop ((c (read-byte))
(lcnt 0))
(cond [(eof-object? c)]
[(and limit (>= lcnt limit)) (display "=\r\n") (loop c 0)]
[(and limit (>= lcnt limit) (or (= c #x20) (= c #x09)))
;; space or tab at the end of line
(write-byte c) (display "=\r\n") (loop (read-byte) 0)]
[(and binary (or (= c #x0a) (= c #x0d)))
(format #t "=0~X" c) (loop (read-byte) (+ lcnt 1))]
[(= c #x0d)
(let ((c1 (read-byte)))
(cond ((= c1 #x0a) (display "\r\n") (loop (read-byte) 0))
(else (display "\r\n") (loop c1 0))))]
[(= c #x0a)
(display "\r\n") (loop (read-byte) 0)]
;; NB: we escape '?' as well, for it interferes the header
;; field encoding defined in RFC2047.
[(or (< #x20 c #x3d) (= c #x3e) (< #x3f c #x7f))
(write-byte c) (loop (read-byte) (+ lcnt 1))]
[else
(format #t "=~2,'0X" c) (loop (read-byte) (+ lcnt 3))]))
))
(define (quoted-printable-encode-string string . args)
(with-string-io string (cut apply quoted-printable-encode args)))
(define (quoted-printable-decode)
(let loop ((c (read-char)))
(cond ((eof-object? c))
((char=? c #\=)
(let ((c1 (read-char)))
(cond
((eof-object? c1)) ; illegal, but we recognize it as a soft newline
((char=? c1 #\newline) (loop (read-char))) ; soft newline
((char=? c1 #\return) ; soft newline
(let ((c2 (read-char)))
(if (char=? c2 #\newline) (loop (read-char)) (loop c2))))
((memv c1 '(#\tab #\space)) ; possibly soft newline
(let loop2 ((c2 (read-char))
(r (list c1 c)))
(cond ((eof-object? c2))
((char=? c2 #\newline) (loop (read-char)))
((char=? c2 #\return)
(let ((c3 (read-char)))
(if (char=? c3 #\newline)
(loop (read-char))
(loop c3))))
((memv c2 '(#\tab #\space))
(loop2 (read-char) (cons c2 r)))
(else
(for-each write-char (reverse r))
(loop c2)))))
((digit->integer c1 16)
=> (lambda (num1)
(let ((c2 (read-char)))
(cond ((eof-object? c2) (write-char c) (write-char c1))
((digit->integer c2 16)
=> (lambda (num2)
(write-byte (+ (* num1 16) num2))
(loop (read-char))))
(else
(write-char c) (write-char c1) (loop c2))))))
(else
(write-char c) (loop c1)))))
(else
(write-char c) (loop (read-char))))
)
)
(define (quoted-printable-decode-string string)
(with-string-io string quoted-printable-decode))
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