conditions.lisp

   1 ;;;
   2 ;;; Copyright (c) 2008 Zachary Beane, All Rights Reserved
   3 ;;;
   4 ;;; Redistribution and use in source and binary forms, with or without
   5 ;;; modification, are permitted provided that the following conditions
   6 ;;; are met:
   7 ;;;
   8 ;;;   * Redistributions of source code must retain the above copyright
   9 ;;;     notice, this list of conditions and the following disclaimer.
  10 ;;;
  11 ;;;   * Redistributions in binary form must reproduce the above
  12 ;;;     copyright notice, this list of conditions and the following
  13 ;;;     disclaimer in the documentation and/or other materials
  14 ;;;     provided with the distribution.
  15 ;;;
  16 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
  17 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18 ;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19 ;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21 ;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  22 ;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23 ;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  24 ;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  25 ;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  26 ;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 ;;;
  28 ;;; conditions.lisp
  29
  30 (in-package #:zpng)
  31
  32 (define-condition zpng-error (error) ())
  33
  34 (define-condition invalid-size (zpng-error)
  35   ((width
  36     :initarg :width
  37     :reader invalid-size-width)
  38    (height
  39     :initarg :height
  40     :reader invalid-size-height))
  41   (:report (lambda (condition stream)
  42              (format stream "Invalid PNG size ~Ax~A; ~
  43                              both width and height must be positive"
  44                      (invalid-size-width condition)
  45                      (invalid-size-height condition)))))
  46
  47 (define-condition invalid-row-length (zpng-error)
  48   ((expected-length
  49     :initarg :expected-length
  50     :accessor invalid-row-length-expected-length)
  51    (actual-length
  52     :initarg :actual-length
  53     :accessor invalid-row-length-actual-length))
  54   (:report (lambda (condition stream)
  55              (format stream "Invalid row length ~A (expected ~A)"
  56                      (invalid-row-length-actual-length condition)
  57                      (invalid-row-length-expected-length condition)))))
  58
  59 (define-condition insufficient-rows (zpng-error)
  60   ((written
  61     :initarg :written
  62     :accessor insufficient-rows-written)
  63    (needed
  64     :initarg :needed
  65     :accessor insufficient-rows-needed))
  66   (:report (lambda (condition stream)
  67              (format stream "Insufficient rows written; need ~A, but only ~A ~
  68                              written"
  69                      (insufficient-rows-needed condition)
  70                      (insufficient-rows-written condition)))))
  71
  72 (define-condition too-many-rows (zpng-error)
  73   ((count
  74     :initarg :count
  75     :accessor too-many-rows-count))
  76   (:report (lambda (condition stream)
  77              (format stream "Too many rows written for PNG; maximum row count ~
  78                              is ~A"
  79                      (too-many-rows-count condition)))))