io.event/io-buffer.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Indent-tabs-mode: NIL -*-
   2 ;;;
   3 ;;; io-buffer.lisp - Manage a connection buffer.
   4 ;;;
   5 ;;; Copyright (C) 2007, Stelian Ionescu  <sionescu@common-lisp.net>
   6 ;;;
   7 ;;; This code is free software; you can redistribute it and/or
   8 ;;; modify it under the terms of the version 2.1 of
   9 ;;; the GNU Lesser General Public License as published by
  10 ;;; the Free Software Foundation, as clarified by the
  11 ;;; preamble found here:
  12 ;;;     http://opensource.franz.com/preamble.html
  13 ;;;
  14 ;;; This program is distributed in the hope that it will be useful,
  15 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;;; GNU General Public License for more details.
  18 ;;;
  19 ;;; You should have received a copy of the GNU Lesser General
  20 ;;; Public License along with this library; if not, write to the
  21 ;;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  22 ;;; Boston, MA 02110-1301, USA
  23
  24 (in-package :io.event)
  25
  26 (defclass io-buffer ()
  27   ((data :accessor data-of)
  28    (size :accessor size-of)
  29    (start :initarg :start :accessor start-of)
  30    (end :initarg :end :accessor end-of))
  31   (:default-initargs :start 0 :end 0))
  32
  33 (defvar *default-buffer-size* 4096)
  34
  35 (defmethod initialize-instance :after ((buffer io-buffer) &key
  36                                        (size *default-buffer-size*))
  37   (setf (data-of buffer) (make-array (or size *default-buffer-size*)
  38                                      :element-type '(unsigned-byte 8)
  39                                      :initial-element 0)
  40         (size-of buffer) size))