org.armedbear.lisp.read-sequence.lisp Maven / Gradle / Ivy
;;; read-sequence.lisp
;;;
;;; Copyright (C) 2004-2005 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module. An independent module is a module which is not derived from
;;; or based on this library. If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so. If you do not wish to do so, delete this
;;; exception statement from your version.
(in-package #:system)
(defun read-sequence (sequence stream &key (start 0) end)
(declare (type stream stream))
(require-type start '(integer 0))
(if end
(require-type end '(integer 0))
(setf end (length sequence)))
(let* ((element-type (expand-deftype (stream-element-type stream))))
(cond ((eq element-type 'character)
(do ((pos start (1+ pos)))
((>= pos end) pos)
(let ((element (read-char stream nil :eof)))
(when (eq element :eof)
(return pos))
(setf (elt sequence pos) element))))
((equal element-type '(unsigned-byte 8))
(if (and (vectorp sequence)
(equal (array-element-type sequence) '(unsigned-byte 8)))
(read-vector-unsigned-byte-8 sequence stream start end)
(do ((pos start (1+ pos)))
((>= pos end) pos)
(let ((element (read-8-bits stream nil :eof)))
(when (eq element :eof)
(return pos))
(setf (elt sequence pos) element)))))
(t
(do ((pos start (1+ pos)))
((>= pos end) pos)
(let ((element (read-byte stream nil :eof)))
(when (eq element :eof)
(return pos))
(setf (elt sequence pos) element)))))))