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;;; -*- mode: scheme; coding: utf-8; -*-
;;; Guile-zlib --- Functional package management for GNU
;;; Copyright © 2016, 2019, 2021, 2024 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2023 Artyom V. Poptsov <poptsov.artyom@gmail.com>
;;;
;;; This file is part of Guile-zlib.
;;;
;;; Guile-zlib is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Guile-zlib 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 Guile-zlib. If not, see <http://www.gnu.org/licenses/>.
(define-module (test-zlib)
#:use-module (zlib)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-64)
#:use-module (srfi srfi-26)
#:use-module (ice-9 binary-ports)
#:use-module (rnrs bytevectors)
#:use-module (rnrs io ports)
#:use-module (ice-9 match))
(test-begin "zlib")
(define (random-seed)
(logxor (getpid) (car (gettimeofday))))
(define %seed
(let ((seed (random-seed)))
(format (current-error-port) "random seed for tests: ~a~%"
seed)
(seed->random-state seed)))
(define (random-bytevector n)
"Return a random bytevector of N bytes."
(let ((bv (make-bytevector n)))
(let loop ((i 0))
(if (< i n)
(begin
(bytevector-u8-set! bv i (random 256 %seed))
(loop (1+ i)))
bv))))
(let ((str "αβγ"))
;; Guile 2.x lacks 'call-with-output-bytevector'.
(unless (defined? 'call-with-output-bytevector) (test-skip 1))
(test-equal "port encoding is inherited"
str
(let ((bv (call-with-output-bytevector
(lambda (o)
; has to be set because call-with-output-bytevector ignores %default-port-encoding.
(set-port-encoding! o "UTF-8")
(call-with-zlib-output-port
o
(lambda (o)
; force encoding here to reveal a mismatch on read.
(set-port-encoding! o "UTF-8")
(write str o)))))))
(with-fluids ((%default-port-encoding "UTF-8"))
(call-with-input-bytevector
bv
(lambda (o)
; has to be set because call-with-input-bytevector ignores %default-port-encoding; see above.
(set-port-encoding! o "UTF-8")
(call-with-zlib-input-port o read)))))))
(test-assert "compression/decompression pipe"
(let ((data (random-bytevector (+ (random 10000)
(* 20 1024)))))
(match (pipe)
((parent . child)
(match (primitive-fork)
(0 ;compress
(dynamic-wind
(const #t)
(lambda ()
(close-port parent)
(call-with-gzip-output-port child
(lambda (port)
(put-bytevector port data))))
(lambda ()
(primitive-exit 0))))
(pid ;decompress
(begin
(close-port child)
(let ((received (call-with-gzip-input-port parent
(lambda (port)
(get-bytevector-all port))
#:buffer-size (* 64 1024))))
(match (waitpid pid)
((_ . status)
(and (zero? status)
(port-closed? parent)
(bytevector=? received data))))))))))))
(unless (file-exists? "/dev/full") (test-skip 1))
(test-assert "gzip output port, error"
(catch 'zlib-error
(lambda ()
(call-with-output-file "/dev/full"
(lambda (p)
(let ((p (make-gzip-output-port p)))
(put-bytevector p (random-bytevector 262140))
(force-output p)
(close-port p))))
#f)
(lambda (key ret code message . _)
(and (= code Z_ERRNO)
(string-contains message "No space left")
(string-contains
(call-with-output-string
(lambda (port)
(print-exception port #f key (list key ret code message))))
"No space left")))))
(test-assert "raw compress/decompress"
(let* ((data (random-bytevector (+ (random 10000) (* 20 1024))))
(cdata (compress data))
(ucdata (uncompress cdata)))
(equal? data ucdata)))
(define (test-zlib n fmt level)
(test-assert (format #f "zlib ports [size: ~a, format: ~a, level: ~a]"
n fmt level)
(let* ((size (pk 'size (+ (random n %seed) n)))
(data (random-bytevector size)))
(let*-values (((port get)
(open-bytevector-output-port))
((compressed)
(make-zlib-output-port port
#:level level
#:format fmt)))
(put-bytevector compressed data)
(close-port compressed)
(let ((data2 (get-bytevector-all
(make-zlib-input-port
(open-bytevector-input-port (get))
#:format fmt))))
(pk 'sizes size 'vs (bytevector-length data2))
(bytevector=? data2 data))))))
(for-each (lambda (n)
(for-each (lambda (format)
(for-each (lambda (level)
(test-zlib n format level))
(iota 9 1)))
'(deflate zlib gzip)))
(list (expt 2 8) (expt 2 10) (expt 2 12)
(expt 2 14) (expt 2 18)))
;; This test checks if "uncompress" is able to allocate enough memory for the
;; output when the input data has high compression ratio properly (e.g. when the
;; input data is but a lots of compressed zeroes.)
;;
;; See <https://notabug.org/guile-zlib/guile-zlib/issues/4>
(let* ((data (make-bytevector 100000 0))
(data-length (bytevector-length data)))
(test-equal "uncompress: High compression ratio"
data-length
(let ((compressed-data (compress data)))
(bytevector-length (uncompress compressed-data)))))
(let ((bv (compress #vu8(0))))
(unless (= 9 (bytevector-length bv)) (test-skip 1))
(test-equal "uncompress: input size times 1.5 is a fraction"
#vu8(0)
;; In 0.2.0, this would throw:
;; (wrong-type-arg #f "Wrong type (expecting ~A): ~S" ("exact integer" 27/2) (27/2))
;; where 27/2 is 9x1.5 and 9 the size of BV.
(uncompress bv)))
(test-end)
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