97 lines
3.7 KiB
Scheme
97 lines
3.7 KiB
Scheme
;;; blowfish.scm - blowfish encrypt and decrypt
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;;;
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;;; Copyright (c) 2012 Johan Ceuppens
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;;;
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;;; All rights reserved.
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;;;
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;;; Redistribution and use in source and binary forms, with or without
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;;; modification, are permitted provided that the following conditions
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;;; are met:
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;;; 1. Redistributions of source code must retain the above copyright
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;;; notice, this list of conditions and the following disclaimer.
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;;; 2. Redistributions in binary form must reproduce the above copyright
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;;; notice, this list of conditions and the following disclaimer in the
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;;; documentation and/or other materials provided with the distribution.
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;;; 3. The name of the authors may not be used to endorse or promote products
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;;; derived from this software without specific prior written permission.
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;;;
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;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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;;; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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;;; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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;;; IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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;;; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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;;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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;;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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;;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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;;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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(define (make-dictionary1)
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;; methods are FIFO (first fixed first out)
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(let ((*dict '()))
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(define (get key) ;; get key
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(do ((l *dict (cdr l)))
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((eq? key (caar l))
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(cadar l));;returns value
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))
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(define (ref-with-index i) ;; get key
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(if (>= i (length *dict))
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(begin (display "dictionary - index out of range")
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0)
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(do ((j 0 (+ j 1))
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(l *dict (cdr l)))
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((= j i)
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(car l));;returns value
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)))
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(define (set-with-index i value) ;; set value
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(do ((j 0 (+ j 1))
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(l *dict (cdr l)))
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((= j i)
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(set-car! (list-ref *dict j) value));;sets value FIXME
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))
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(define (get-substring key) ;; get key
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(do ((l *dict (cdr l)))
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((string<=? (if (symbol? key)
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(symbol->string key)
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(if (string? key)
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key
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(display "dictionary-get-substring : unknown key type")))
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(symbol->string (caar l)))
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(cadr l));;returns value
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))
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(define (add key value)
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(set! *dict (append *dict (list (list key value)))))
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(define (set key value) ;; get key
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(do ((l *dict (cdr l))
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(res '() (append (list (car l) res))))
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((eq? key (caar l))
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(set-car! (cdr res) value)
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(set! *dict (append res (cdr l))))
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))
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(lambda (msg)
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(cond ((eq? msg 'get) get)
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((eq? msg 'ref-with-index) ref-with-index)
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((eq? msg 'set-with-index) set-with-index)
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((eq? msg 'get-substring) get-substring)
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((eq? msg 'set) set)
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((eq? msg 'add) add)
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(else (display "make-dictionary"))))
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))
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(define make-dictionary make-dictionary1)
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(define (dictionary-ref dict key) ((dict 'get) key))
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(define (dictionary-ref-with-index dict i) ((dict 'ref-with-index) i))
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;; NOTE: dictionary-ref-substring: match key part with keys in dict
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(define (dictionary-ref-substring dict key) ((dict 'get-substring) key))
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(define (dictionary-set! dict key value) ((dict 'set) key value))
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(define (dictionary-add! dict key value) ((dict 'add) key value))
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(define (dictionary-set-with-index! dict i value) ((dict 'set-with-index) i value))
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