;;; R7RS-PNM --- Library for reading and writing PNM (Portable Any Map) files for R7RS
;;; Copyright © 2024 Masaya Tojo <masaya@tojo.tokyo>
;;;
;;; This file is part of R7RS-PNM.
;;;
;;; R7RS-PNM 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 version.
;;;
;;; R7RS-PNM 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 Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public License
;;; along with R7RS-PNM. If not, see <https://www.gnu.org/licenses/>.

(define-library (image-format pnm private bitwise)
  (export bitwise-and
          bitwise-ior
          arithmetic-shift
          bit-set?
          copy-bit)
  (import (scheme base))
  (cond-expand
    ((library (scheme bitwise))
     (import (only (scheme bitwise)
                   bitwise-and bitwise-ior arithmetic-shift
                   bit-set? copy-bit)))
    ((library (srfi 60))
     (import (only (srfi 60)
                   bitwise-and bitwise-ior arithmetic-shift
                   bit-set? copy-bit)))
    ((library (srfi 151))
     (import (only (srfi 151)
                   bitwise-and bitwise-ior arithmetic-shift
                   bit-set? copy-bit)))))