/usr/share/gauche-0.9/0.9.4/lib/rfc/mime-port.scm is in gauche 0.9.4-6.
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;;; mime-port.scm - submodule to read from mime part body
;;;
;;; Copyright (c) 2000-2014 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.
;;;
;; This module is autoloaded from rfc.mime. You don't need to "use" this
;; directly.
(define-module rfc.mime-port
(use gauche.uvector)
(use gauche.vport)
(use util.queue)
(use util.match)
(export make-mime-port))
(select-module rfc.mime-port)
;;===============================================================
;; Virtual port to recognize mime boundary
;;
(define-class <mime-port> (<buffered-input-port>)
((state :init-form 'prologue)
;; prologue -> boundary <-> body -> eof
))
;; Creates a procedural port, which reads from SRCPORT until it reaches
;; either EOF or MIME boundary. Basically it runs a DFA.
(define (make-mime-port boundary srcport)
(define q (make-queue))
(define --boundary (string->u8vector #`"--,boundary"))
(define port (make <mime-port>))
(define eof (read-from-string ""))
(define (deq! q)
(if (queue-empty? q) eof (dequeue! q)))
(define (fifo! q b)
(enqueue! q b) (dequeue! q))
(define (getb)
(if (queue-empty? q)
(case (ref port 'state)
[(prologue) (skip-prologue)]
[(boundary eof) eof]
[else (newb)])
(dequeue! q)))
(define (newb)
(match (read-byte srcport)
[(and #x0d b) ;; CR, check to see LF
(let1 b2 (peek-byte srcport)
(if (eqv? b2 #x0a)
(begin
(read-byte srcport)
(enqueue! q b #x0a)
(check-boundary))
b))]
[(and #x0a b) ;; LF, check boundary
(enqueue! q b) (check-boundary)]
[(? eof-object?) (set! (ref port 'state) 'eof) eof]
[b b]))
(define (check-boundary)
(let loop ((b (peek-byte srcport))
(ind 0)
(max (u8vector-length --boundary)))
(cond [(eof-object? b) (deq! q)]
[(= ind max)
(cond [(memv b '(#x0d #x0a)) ;;found boundary
(read-byte srcport) ;;consume LF or CRLF
(when (and (eqv? #x0d b)
(eqv? #x0a (peek-byte srcport)))
(read-byte srcport))
(dequeue-all! q)
(set! (ref port 'state) 'boundary)
eof]
[(eqv? b #x2d) ;; maybe end boundary
(enqueue! q (read-byte srcport))
(cond [(eqv? (peek-byte srcport) #x2d);; yes, end boundary
(read-byte srcport)
(dequeue-all! q)
(skip-epilogue)]
[else (deq! q)])]
[else (deq! q)])]
[(= b (u8vector-ref --boundary ind))
(enqueue! q (read-byte srcport))
(loop (peek-byte srcport) (+ ind 1) max)]
[(queue-empty? q) (newb)]
[else (dequeue! q)])))
;; Reads past the first boundary. The first boundary may appear
;; at the beginning of the message (instead of after CRLF), so
;; we need slightly different handling than the normal getb.
(define (skip-prologue)
(let loop ((b (check-boundary)))
(cond
[(eof-object? b)
(cond [(eq? (ref port 'state) 'boundary) ; we've found the boundary
(set! (ref port 'state) 'body) (getb)]
[else ; no boundary found
(set! (ref port 'state) 'eof) eof])]
[(queue-empty? q) (loop (newb))]
[else (dequeue-all! q) (loop (newb))])))
(define (skip-epilogue)
(let loop ((b (read-byte srcport)))
(if (eof-object? b)
(begin (set! (ref port 'state) 'eof) b)
(loop (read-byte srcport)))))
;; fills vector, until it sees either
;; (1) vec got full
;; (2) srcport reaches EOF
;; (3) mime-boundary is read
(define (fill vec)
(let1 len (u8vector-length vec)
(let loop ((ind 0))
(if (= ind len)
len
(let1 b (getb)
(if (eof-object? b)
ind
(begin (u8vector-set! vec ind b)
(loop (+ ind 1)))))))))
(set! (ref port 'fill) fill)
port)
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