;; This file is part of eris-cl.
;; Copyright (C) 2022 Piotr Szarmański

;; eris-cl is free software: you can redistribute it and/or modify it under the
;; terms of the GNU Lesser General Public License as published by the Free
;; Software Foundation, either version 3 of the License, or (at your option) any
;; later versqion.

;; eris-cl 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
;; eris-cl. If not, see <https://www.gnu.org/licenses/>.

(in-package :eris)

(define-constant +eris-revision+ "1.0"
  :test #'equalp
  :documentation
  "String constant indicating the ERIS standard revision supported by this
implementation.")

(define-condition eris-condition () ())

(define-condition missing-block (eris-condition error)
  ((reference :initarg :reference :reader reference))
  (:report (lambda (condition stream)
             (format stream "Missing block: ~a" (reference condition)))))

(define-condition padding-error (eris-condition error)
  ()
  (:report "Corrupted padding."))

(define-condition version-mismatch (eris-condition error)
  ()
  (:report (lambda (condition stream)
             (declare (ignore condition))
             (format stream "Provided object has been encoded with a different version of the ERIS standard than ~a." +eris-revision+))))

(define-condition eof (eris-condition error)
  ((eof :initarg :eof :reader eof)
   (pos :initarg :position :reader pos))
  (:report (lambda (condition stream)
             (with-slots (eof pos) condition
               (format stream "End of file (~d) reached at ~d." eof pos)))))

(define-condition hash-mismatch (eris-condition error)
  ((reference :initarg :reference :reader reference)
   (hash :initarg :hash :reader hash))
  (:report (lambda (condition stream)
             (format stream "The hash ~a does not match the reference ~a." (hash condition) (reference condition)))))

(define-condition invalid-internal-block (eris-condition error)
  ((reference :initarg :reference :reader reference))
  (:report (lambda (condition stream)
             (format stream "The internal block ~a is invalid." (reference condition)))))