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;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: FLEXI-STREAMS; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/flexi-streams/mapping.lisp,v 1.3 2008/05/25 19:07:53 edi Exp $
;;; Copyright (c) 2005-2008, Dr. Edmund Weitz. All rights reserved.
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * 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.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; 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 AUTHOR 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.
(in-package :flexi-streams)
(deftype octet ()
"A shortcut for \(UNSIGNED-BYTE 8)."
'(unsigned-byte 8))
(deftype char* ()
"Convenience shortcut to paper over the difference between LispWorks
and the other Lisps."
#+:lispworks 'lw:simple-char
#-:lispworks 'character)
(deftype string* ()
"Convenience shortcut to paper over the difference between LispWorks
and the other Lisps."
#+:lispworks 'lw:text-string
#-:lispworks 'string)
(deftype char-code-integer ()
"The subtype of integers which can be returned by the function CHAR-CODE."
#-:cmu '(integer 0 #.(1- char-code-limit))
#+:cmu '(integer 0 65533))
(deftype code-point ()
"The subtype of integers that's just big enough to hold all Unicode
codepoints.
See for example <http://unicode.org/glossary/#C>."
'(mod #x110000))
(defmacro defconstant (name value &optional doc)
"Make sure VALUE is evaluated only once \(to appease SBCL)."
`(cl:defconstant ,name (if (boundp ',name) (symbol-value ',name) ,value)
,@(when doc (list doc))))
(defun invert-table (table)
"`Inverts' an array which maps octets to character codes to a hash
table which maps character codes to octets."
(let ((hash (make-hash-table)))
(loop for octet from 0
for char-code across table
unless (= char-code 65533)
do (setf (gethash char-code hash) octet))
hash))
(defun make-decoding-table (list)
"Creates and returns an array which contains the elements in the
list LIST and has an element type that's suitable for character
codes."
(make-array (length list)
:element-type 'char-code-integer
:initial-contents list))
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