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;;; binary-ports.scm --- Binary IO on ports
;;; Copyright (C) 2009-2011,2013,2016,2019,2021 Free Software Foundation, Inc.
;;;
;;; This library 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.
;;;
;;; This library 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 this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Author: Ludovic Courtès <ludo@gnu.org>
;;; Commentary:
;;;
;;; The I/O port API of the R6RS is provided by this module. In many areas
;;; it complements or refines Guile's own historical port API. For instance,
;;; it allows for binary I/O with bytevectors.
;;;
;;; Code:
(define-module (ice-9 binary-ports)
#:use-module (rnrs bytevectors)
#:export (eof-object
open-bytevector-input-port
make-custom-binary-input-port
get-u8
lookahead-u8
get-bytevector-n
get-bytevector-n!
get-bytevector-some
get-bytevector-some! ; Guile extension, not in R6RS
get-bytevector-all
get-string-n!
put-u8
put-bytevector
unget-bytevector
open-bytevector-output-port
make-custom-binary-output-port
make-custom-binary-input/output-port
call-with-input-bytevector
call-with-output-bytevector))
;; Note that this extension also defines %make-transcoded-port, which is
;; not exported but is used by (rnrs io ports).
(load-extension (string-append "libguile-" (effective-version))
"scm_init_r6rs_ports")
(define (call-with-input-bytevector bv proc)
"Call the one-argument procedure @var{proc} with a newly created
binary input port from which the bytevector @var{bv}'s contents may be
read. All values yielded by @var{proc} are returned."
(proc (open-bytevector-input-port bv)))
(define (call-with-output-bytevector proc)
"Call the one-argument procedure @var{proc} with a newly created
binary output port. When the function returns, port is closed and the
bytevector composed of the bytes written into the port is returned."
(call-with-values
(lambda ()
(open-bytevector-output-port))
(lambda (port get-bytevector)
(proc port)
(let ((bv (get-bytevector)))
(close-port port)
bv))))