;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015 Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>
;;; Copyright © 2015, 2016 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2015, 2016, 2017, 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2015, 2017, 2018 Leo Famulari <leo@famulari.name>
;;; Copyright © 2015 Jeff Mickey <j@codemac.net>
;;; Copyright © 2015, 2016, 2017, 2018, 2019 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2016 Ben Woodcroft <donttrustben@gmail.com>
;;; Copyright © 2016 Danny Milosavljevic <dannym@scratchpost.org>
;;; Copyright © 2016, 2017, 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2016 David Craven <david@craven.ch>
;;; Copyright © 2016, 2019 Kei Kebreau <kkebreau@posteo.net>
;;; Copyright © 2016, 2018 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2017 ng0 <ng0@n0.is>
;;; Copyright © 2017 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
;;; Copyright © 2017 Theodoros Foradis <theodoros@foradis.org>
;;; Copyright © 2017 Stefan Reichör <stefan@xsteve.at>
;;; Copyright © 2017 Petter <petter@mykolab.ch>
;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu>
;;; Copyright © 2018 Rutger Helling <rhelling@mykolab.com>
;;; Copyright © 2018 Joshua Sierles, Nextjournal <joshua@nextjournal.com>
;;; Copyright © 2018 Pierre Neidhardt <mail@ambrevar.xyz>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages compression)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix utils)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix git-download)
  #:use-module (guix build-system cmake)
  #:use-module (guix build-system gnu)
  #:use-module (gnu packages)
  #:use-module (gnu packages assembly)
  #:use-module (gnu packages autotools)
  #:use-module (gnu packages backup)
  #:use-module (gnu packages base)
  #:use-module (gnu packages boost)
  #:use-module (gnu packages check)
  #:use-module (gnu packages curl)
  #:use-module (gnu packages file)
  #:use-module (gnu packages maths)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages pkg-config)
  #:use-module (gnu packages python)
  #:use-module (gnu packages tls)
  #:use-module (gnu packages valgrind)
  #:use-module (ice-9 match)
  #:use-module ((srfi srfi-1) #:select (last)))

(define-public zlib
  (package
    (name "zlib")
    (version "1.2.11")
    (source
     (origin
      (method url-fetch)
      (uri (list (string-append "http://zlib.net/zlib-"
                                 version ".tar.gz")
                 (string-append "mirror://sourceforge/libpng/zlib/"
                                version "/zlib-" version ".tar.gz")))
      (sha256
       (base32
        "18dighcs333gsvajvvgqp8l4cx7h1x7yx9gd5xacnk80spyykrf3"))))
    (build-system gnu-build-system)
    (outputs '("out" "static"))
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (replace 'configure
           (lambda* (#:key outputs #:allow-other-keys)
             ;; Zlib's home-made `configure' fails when passed
             ;; extra flags like `--enable-fast-install', so we need to
             ;; invoke it with just what it understand.
             (let ((out (assoc-ref outputs "out")))
               ;; 'configure' doesn't understand '--host'.
               ,@(if (%current-target-system)
                     `((setenv "CHOST" ,(%current-target-system)))
                     '())
               (invoke "./configure"
                       (string-append "--prefix=" out)))))
         (add-after 'install 'move-static-library
           (lambda* (#:key outputs #:allow-other-keys)
             (let ((out (assoc-ref outputs "out"))
                   (static (assoc-ref outputs "static")))
               (with-directory-excursion (string-append out "/lib")
                 (install-file "libz.a" (string-append static "/lib"))
                 (delete-file "libz.a")
                 #t)))))))
    (home-page "https://zlib.net/")
    (synopsis "Compression library")
    (description
     "zlib is designed to be a free, general-purpose, legally unencumbered --
that is, not covered by any patents -- lossless data-compression library for
use on virtually any computer hardware and operating system.  The zlib data
format is itself portable across platforms.  Unlike the LZW compression method
used in Unix compress(1) and in the GIF image format, the compression method
currently used in zlib essentially never expands the data. (LZW can double or
triple the file size in extreme cases.)  zlib's memory footprint is also
independent of the input data and can be reduced, if necessary, at some cost
in compression.")
    (license license:zlib)))

(define-public minizip
  (package
    (name "minizip")
    (version (package-version zlib))
    (source (package-source zlib))
    (build-system gnu-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'enter-source
           (lambda _ (chdir "contrib/minizip") #t)))))
    (native-inputs
     `(("autoconf" ,autoconf)
       ("automake" ,automake)
       ("libtool" ,libtool)))
    (propagated-inputs `(("zlib" ,zlib)))
    (home-page (package-home-page zlib))
    (synopsis "Zip Compression library")
    (description
     "Minizip is a minimalistic library that supports compressing,
extracting and viewing ZIP archives.  This version is extracted from
the @code{zlib} source.")
    (license (package-license zlib))))

(define-public fastjar
  (package
   (name "fastjar")
   (version "0.98")
   (source (origin
             (method url-fetch)
             (uri (string-append "mirror://savannah/fastjar/fastjar-"
                                 version ".tar.gz"))
             (sha256
              (base32
               "0iginbz2m15hcsa3x4y7v3mhk54gr1r7m3ghx0pg4n46vv2snmpi"))))
   (build-system gnu-build-system)
   (inputs `(("zlib" ,zlib)))
   (home-page "https://savannah.nongnu.org/projects/fastjar")
   (synopsis "Replacement for Sun's 'jar' utility")
   (description
    "FastJar is an attempt to create a much faster replacement for Sun's 'jar'
utility.  Instead of being written in Java, FastJar is written in C.")
   (license license:gpl2+)))

(define-public libtar
  (package
   (name "libtar")
   (version "1.2.20")
   (source (origin
            (method url-fetch)
            (uri (list
                   (string-append
                     "ftp://ftp.feep.net/pub/software/libtar/libtar-"
                     version ".tar.gz")
                   (string-append
                     "mirror://debian/pool/main/libt/libtar/libtar_"
                     version ".orig.tar.gz")))
            (sha256
             (base32
              "02cihzl77ia0dcz7z2cga2412vyhhs5pa2355q4wpwbyga2lrwjh"))
            (patches (search-patches "libtar-CVE-2013-4420.patch"))))
   (build-system gnu-build-system)
   (arguments `(#:tests? #f)) ; no "check" target
   (native-inputs
    `(("autoconf" ,autoconf)
      ("automake" ,automake)
      ("libtool" ,libtool)))
   (inputs
    `(("zlib" ,zlib)))
   (synopsis "C library for manipulating POSIX tar files")
   (description
    "libtar is a C library for manipulating POSIX tar files.  It handles
adding and extracting files to/from a tar archive.")
   (home-page "https://repo.or.cz/libtar.git")
   (license license:bsd-3)))

(define-public gzip
  (package
   (name "gzip")
   (version "1.9")
   (source (origin
            (method url-fetch)
            (uri (string-append "mirror://gnu/gzip/gzip-"
                                version ".tar.xz"))
            (sha256
             (base32
              "16h8g4acy7fgfxcjacr3wijjsnixwsfd2jhz3zwdi2qrzi262l5f"))))
   (build-system gnu-build-system)
   (synopsis "General file (de)compression (using lzw)")
   (arguments
    ;; FIXME: The test suite wants `less', and optionally Perl.
    '(#:tests? #f
      #:phases
      (modify-phases %standard-phases
        (add-after 'unpack 'patch-for-glibc-2.28
          (lambda _
            ;; Adjust the bundled gnulib to work with glibc 2.28.  See e.g.
            ;; "m4-gnulib-libio.patch".  This is a phase rather than patch
            ;; or snippet to work around <https://bugs.gnu.org/32347>.
            (substitute* (find-files "lib" "\\.c$")
              (("#if defined _IO_ftrylockfile")
               "#if defined _IO_EOF_SEEN"))
            (substitute* "lib/stdio-impl.h"
              (("^/\\* BSD stdio derived implementations")
               (string-append "#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN\n"
                              "# define _IO_IN_BACKUP 0x100\n"
                              "#endif\n\n"
                              "/* BSD stdio derived implementations")))
            #t))
        (add-after 'unpack 'use-absolute-name-of-gzip
          (lambda* (#:key outputs #:allow-other-keys)
            (substitute* "gunzip.in"
              (("exec gzip")
               (string-append "exec " (assoc-ref outputs "out")
                              "/bin/gzip")))
            #t)))))
   (description
    "GNU Gzip provides data compression and decompression utilities; the
typical extension is \".gz\".  Unlike the \"zip\" format, it compresses a single
file; as a result, it is often used in conjunction with \"tar\", resulting in
\".tar.gz\" or \".tgz\", etc.")
   (license license:gpl3+)
   (home-page "https://www.gnu.org/software/gzip/")))

(define-public bzip2
  (package
    (name "bzip2")
    (version "1.0.6")
    (source (origin
              (method url-fetch)
              ;; XXX The bzip.org domain was allowed to expire.
              (uri (string-append "https://web.archive.org/web/20180624184806/"
                                  "http://www.bzip.org/"
                                  version "/bzip2-" version ".tar.gz"))
              (sha256
               (base32
                "1kfrc7f0ja9fdn6j1y6yir6li818npy6217hvr3wzmnmzhs8z152"))))
    (build-system gnu-build-system)
    (arguments
     `(#:modules ((guix build gnu-build-system)
                  (guix build utils)
                  (ice-9 ftw)
                  (srfi srfi-1))
       #:phases
       (modify-phases %standard-phases
         (replace 'configure
           (lambda* (#:key target #:allow-other-keys)
             (when ,(%current-target-system)
               ;; Cross-compilation: use the cross tools.
               (substitute* (find-files "." "Makefile")
                 (("CC=.*$")
                  (string-append "CC = " target "-gcc\n"))
                 (("AR=.*$")
                  (string-append "AR = " target "-ar\n"))
                 (("RANLIB=.*$")
                  (string-append "RANLIB = " target "-ranlib\n"))
                 (("^all:(.*)test" _ prerequisites)
                  ;; Remove 'all' -> 'test' dependency.
                  (string-append "all:" prerequisites "\n"))))
             #t))
         (add-before 'build 'build-shared-lib
           (lambda* (#:key inputs #:allow-other-keys)
             (patch-makefile-SHELL "Makefile-libbz2_so")
             (invoke "make" "-f" "Makefile-libbz2_so")))
         (add-after 'install 'install-shared-lib
           (lambda* (#:key outputs #:allow-other-keys)
             ;; The Makefile above does not have an 'install' target, nor does
             ;; it create all the (un)versioned symlinks, so we handle it here.
             (let* ((out    (assoc-ref outputs "out"))
                    (libdir (string-append out "/lib"))
                    (soname "libbz2.so")
                    ;; Locate the built library (e.g. "libbz2.so.1.0.6").
                    (lib (car (scandir "."
                                       (lambda (file)
                                         (and (string-prefix? soname file)
                                              (eq? 'regular
                                                   (stat:type (lstat file))))))))
                    (soversion (string-drop lib (+ 1 (string-length soname)))))
               (install-file lib libdir)
               (with-directory-excursion libdir
                 ;; Create symlinks libbz2.so.1 -> libbz2.so.1.0, etc.
                 (let loop ((base soname)
                            (numbers (string-split soversion #\.)))
                   (unless (null? numbers)
                     (let ((so-file (string-append base "." (car numbers))))
                       (symlink so-file base)
                       (loop so-file (cdr numbers))))))
               #t)))
         (add-after 'install-shared-lib 'move-static-lib
           (lambda* (#:key outputs #:allow-other-keys)
             (let ((out (assoc-ref outputs "out"))
                   (static (assoc-ref outputs "static")))
               (with-directory-excursion (string-append out "/lib")
                 (install-file "libbz2.a" (string-append static "/lib"))
                 (delete-file "libbz2.a")
                 #t))))
         (add-after 'install-shared-lib 'patch-scripts
           (lambda* (#:key outputs inputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out")))
               (substitute* (string-append out "/bin/bzdiff")
                 (("/bin/rm") "rm")))
             #t)))

       #:make-flags (list (string-append "PREFIX="
                                         (assoc-ref %outputs "out")))

       ;; Don't attempt to run the tests when cross-compiling.
       ,@(if (%current-target-system)
             '(#:tests? #f)
             '())))
    (outputs '("out" "static"))
    (synopsis "High-quality data compression program")
    (description
     "bzip2 is a freely available, patent free (see below), high-quality data
compressor.  It typically compresses files to within 10% to 15% of the best
available techniques (the PPM family of statistical compressors), whilst
being around twice as fast at compression and six times faster at
decompression.")
    (license (license:non-copyleft "file://LICENSE"
                                   "See LICENSE in the distribution."))
    (home-page "https://web.archive.org/web/20180801004107/http://www.bzip.org/")))

(define-public lbzip2
  (package
    (name "lbzip2")
    (version "2.5")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://archive.lbzip2.org/lbzip2-"
                                  version ".tar.gz"))
              (sha256
               (base32
                "1sahaqc5bw4i0iyri05syfza4ncf5cml89an033fspn97klmxis6"))
             (modules '((guix build utils)))
             (snippet
              '(begin
                 (substitute* (find-files "lib" "\\.c$")
                   (("#if defined _IO_ftrylockfile")
                    "#if defined _IO_EOF_SEEN"))
                 (substitute* "lib/stdio-impl.h"
                   (("^/\\* BSD stdio derived implementations")
                    (string-append "#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN\n"
                                   "# define _IO_IN_BACKUP 0x100\n"
                                   "#endif\n\n"
                                   "/* BSD stdio derived implementations")))
                 #t))))
    (build-system gnu-build-system)
    (synopsis "Parallel bzip2 compression utility")
    (description
     "lbzip2 is a multi-threaded compression utility with support for the
bzip2 compressed file format.  lbzip2 can process standard bz2 files in
parallel.  It uses POSIX threading model (pthreads), which allows it to take
full advantage of symmetric multiprocessing (SMP) systems.  It has been proven
to scale linearly, even to over one hundred processor cores.  lbzip2 is fully
compatible with bzip2 – both at file format and command line level.")
    (home-page "http://www.lbzip2.org/")
    (license license:gpl3+)))

(define-public pbzip2
  (package
    (name "pbzip2")
    (version "1.1.13")
    (source (origin
             (method url-fetch)
             (uri (string-append "https://launchpad.net/pbzip2/"
                                 (version-major+minor version) "/" version
                                 "/+download/" name "-" version ".tar.gz"))
             (sha256
              (base32
               "1rnvgcdixjzbrmcr1nv9b6ccrjfrhryaj7jwz28yxxv6lam3xlcg"))))
    (build-system gnu-build-system)
    (inputs
     `(("bzip2" ,bzip2)))
    (arguments
     `(#:tests? #f                      ; no tests
       #:phases (modify-phases %standard-phases
                  (delete 'configure))  ; no configure script
       #:make-flags (list (string-append "PREFIX=" %output))))
    (home-page "http://compression.ca/pbzip2/")
    (synopsis "Parallel bzip2 implementation")
    (description
     "Pbzip2 is a parallel implementation of the bzip2 block-sorting file
compressor that uses pthreads and achieves near-linear speedup on SMP machines.
The output of this version is fully compatible with bzip2 v1.0.2 (i.e. anything
compressed with pbzip2 can be decompressed with bzip2).")
    (license (license:non-copyleft "file://COPYING"
                                   "See COPYING in the distribution."))))

(define-public xz
  (package
   (name "xz")
   (version "5.2.4")
   (source (origin
            (method url-fetch)
            (uri (list (string-append "http://tukaani.org/xz/xz-" version
                                      ".tar.gz")
                       (string-append "http://multiprecision.org/guix/xz-"
                                      version ".tar.gz")))
            (sha256
             (base32
              "0ibi2zsfaz6l756spjwc5rayf4ckgc9hwmy8qinppcyk4svz64mm"))))
   (build-system gnu-build-system)
   (synopsis "General-purpose data compression")
   (description
    "XZ Utils is free general-purpose data compression software with high
compression ratio.  XZ Utils were written for POSIX-like systems, but also
work on some not-so-POSIX systems.  XZ Utils are the successor to LZMA Utils.

The core of the XZ Utils compression code is based on LZMA SDK, but it has
been modified quite a lot to be suitable for XZ Utils.  The primary
compression algorithm is currently LZMA2, which is used inside the .xz
container format.  With typical files, XZ Utils create 30 % smaller output
than gzip and 15 % smaller output than bzip2.")
   (license (list license:gpl2+ license:lgpl2.1+)) ; bits of both
   (home-page "https://tukaani.org/xz/")))

(define-public lhasa
  (package
    (name "lhasa")
    (version "0.3.1")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "https://github.com/fragglet/lhasa/releases/download/v"
                    version "/lhasa-" version ".tar.gz"))
              (sha256
               (base32
                "092zi9av18ma20c6h9448k0bapvx2plnp292741dvfd9hmgqxc1z"))))
    (build-system gnu-build-system)
    (arguments
     '(#:phases
       (modify-phases %standard-phases
         (add-before 'check 'set-up-test-environment
           (lambda* (#:key inputs #:allow-other-keys)
             (setenv "TZDIR" (string-append (assoc-ref inputs "tzdata")
                                            "/share/zoneinfo"))
             #t)))))
    (native-inputs
     `(("tzdata" ,tzdata)))
    (home-page "https://fragglet.github.com/lhasa/")
    (synopsis "LHA archive decompressor")
    (description "Lhasa is a replacement for the Unix LHA tool, for
decompressing .lzh (LHA / LHarc) and .lzs (LArc) archives.  The backend for the
tool is a library, so that it can be reused for other purposes.  Lhasa aims to
be compatible with as many types of lzh/lzs archives as possible.  It also aims
to generate the same output as the (non-free) Unix LHA tool, so that it will
act as a free drop-in replacement.")
    (license license:isc)))

(define-public lzo
  (package
    (name "lzo")
    (version "2.10")
    (source
     (origin
      (method url-fetch)
      (uri (string-append "http://www.oberhumer.com/opensource/lzo/download/lzo-"
                          version ".tar.gz"))
      (sha256
       (base32
        "0wm04519pd3g8hqpjqhfr72q8qmbiwqaxcs3cndny9h86aa95y60"))))
    (build-system gnu-build-system)
    (arguments '(#:configure-flags '("--enable-shared")))
    (home-page "http://www.oberhumer.com/opensource/lzo")
    (synopsis
     "Data compression library suitable for real-time data de-/compression")
    (description
     "LZO is a data compression library which is suitable for data
de-/compression in real-time.  This means it favours speed over
compression ratio.

LZO is written in ANSI C.  Both the source code and the compressed data
format are designed to be portable across platforms.")
    (license license:gpl2+)))

(define-public lzop
  (package
    (name "lzop")
    (version "1.04")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "http://www.lzop.org/download/lzop-"
                           version ".tar.gz"))
       (sha256
        (base32
         "0h9gb8q7y54m9mvy3jvsmxf21yx8fc3ylzh418hgbbv0i8mbcwky"))))
    (build-system gnu-build-system)
    (inputs `(("lzo" ,lzo)))
    (home-page "https://www.lzop.org/")
    (synopsis "Compress or expand files")
    (description
     "Lzop is a file compressor which is very similar to gzip.  Lzop uses the
LZO data compression library for compression services, and its main advantages
over gzip are much higher compression and decompression speed (at the cost of
some compression ratio).")
    (license license:gpl2+)))

(define-public lzip
  (package
    (name "lzip")
    (version "1.20")
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://savannah/lzip/lzip-"
                                 version ".tar.gz"))
             (sha256
              (base32
               "0319q59kb8g324wnj7xzbr7vvlx5bcs13lr34j0zb3kqlyjq2fy9"))))
    (build-system gnu-build-system)
    (home-page "https://www.nongnu.org/lzip/lzip.html")
    (synopsis "Lossless data compressor based on the LZMA algorithm")
    (description
     "Lzip is a lossless data compressor with a user interface similar to the
one of gzip or bzip2.  Lzip decompresses almost as fast as gzip and compresses
more than bzip2, which makes it well-suited for software distribution and data
archiving.  Lzip is a clean implementation of the LZMA algorithm.")
    (license license:gpl3+)))

(define-public lziprecover
  (package
    (name "lziprecover")
    (version "1.21")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://savannah/lzip/lziprecover/"
                                  "lziprecover-" version ".tar.gz"))
              (sha256
               (base32
                "094w2z8fz41yaq0gkyr61cl7pb1d7kchpl5dka7rvm3qvbb7ncd2"))))
    (build-system gnu-build-system)
    (home-page "https://www.nongnu.org/lzip/lziprecover.html")
    (synopsis "Recover and decompress data from damaged lzip files")
    (description
     "Lziprecover is a data recovery tool and decompressor for files in the lzip
compressed data format (.lz).  It can test the integrity of lzip files, extract
data from damaged ones, and repair most files with small errors (up to one
single-byte error per member) entirely.

Lziprecover is not a replacement for regular backups, but a last line of defence
when even the backups are corrupt.  It can recover files by merging the good
parts of two or more damaged copies, such as can be easily produced by running
@command{ddrescue} on a failing device.

This package also includes @command{unzcrash}, a tool to test the robustness of
decompressors when faced with corrupted input.")
    (license (list license:bsd-2        ; arg_parser.{cc,h}
                   license:gpl2+))))    ; everything else

(define-public sharutils
  (package
    (name "sharutils")
    (version "4.15.2")
    (source
     (origin
      (method url-fetch)
      (uri (string-append "mirror://gnu/sharutils/sharutils-"
                          version ".tar.xz"))
      (patches (search-patches "sharutils-CVE-2018-1000097.patch"))
      (sha256
       (base32
        "16isapn8f39lnffc3dp4dan05b7x6mnc76v6q5nn8ysxvvvwy19b"))
      (modules '((guix build utils)))
      (snippet
       '(begin
          (substitute* (find-files "lib" "\\.c$")
            (("#if defined _IO_ftrylockfile")
             "#if defined _IO_EOF_SEEN"))
          (substitute* "lib/stdio-impl.h"
            (("^/\\* BSD stdio derived implementations")
             (string-append "#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN\n"
                            "# define _IO_IN_BACKUP 0x100\n"
                            "#endif\n\n"
                            "/* BSD stdio derived implementations")))
          #t))))
    (build-system gnu-build-system)
    (inputs
     `(("which" ,which)))
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'patch-source-shebangs 'unpatch-source-shebang
           ;; revert the patch-shebang phase on a script which is
           ;; in fact test data
           (lambda _
             (substitute* "tests/shar-1.ok"
               (((which "sh")) "/bin/sh"))
             #t)))))
    (home-page "https://www.gnu.org/software/sharutils/")
    (synopsis "Archives in shell scripts, uuencode/uudecode")
    (description
     "GNU sharutils is a package for creating and manipulating shell
archives that can be readily emailed.  A shell archive is a file that can be
processed by a Bourne-type shell to unpack the original collection of files.
This package is mostly for compatibility and historical interest.")
    (license license:gpl3+)))

(define-public sfarklib
  (package
    (name "sfarklib")
    (version "2.24")
    (source (origin
              (method url-fetch)
              (uri (string-append "https://github.com/raboof/sfArkLib/archive/"
                                  version ".tar.gz"))
              (file-name (string-append name "-" version ".tar.gz"))
              (sha256
               (base32
                "0bzs2d98rk1xw9qwpnc7gmlbxwmwc3dg1rpn310afy9pq1k9clzi"))))
    (build-system gnu-build-system)
    (arguments
     `(#:tests? #f ;no "check" target
       #:phases
       (modify-phases %standard-phases
         (replace 'configure
                  (lambda* (#:key outputs #:allow-other-keys)
                    (substitute* "Makefile"
                      (("/usr/local") (assoc-ref outputs "out")))
                    #t)))))
    (inputs
     `(("zlib" ,zlib)))
    (home-page "https://github.com/raboof/sfArkLib")
    (synopsis "Library for SoundFont decompression")
    (description
     "SfArkLib is a C++ library for decompressing SoundFont files compressed
with the sfArk algorithm.")
    (license license:gpl3+)))

(define-public sfarkxtc
  (let ((commit "13cd6f93725a90d91ec5ea75babf1dbd694ac463")
        (revision "1"))
    (package
      (name "sfarkxtc")
      (version (git-version "0" revision commit))
      (source (origin
                ;; There are no release tarballs, so we just fetch the latest
                ;; commit at this time.
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/raboof/sfarkxtc.git")
                      (commit commit)))
                (file-name (git-file-name name version))
                (sha256
                 (base32
                  "1mb1jyk1m11l1gppd9hmql9cyp55sdf7jk5rbc7acky1z4k4mv19"))))
      (build-system gnu-build-system)
      (arguments
       `(#:tests? #f                    ;no "check" target
         #:phases
         (modify-phases %standard-phases
           (replace 'configure
             (lambda* (#:key outputs #:allow-other-keys)
               (substitute* "Makefile"
                 (("/usr/local") (assoc-ref outputs "out")))
               #t)))))
      (inputs
       `(("zlib" ,zlib)
         ("sfarklib" ,sfarklib)))
      (home-page "https://github.com/raboof/sfarkxtc")
      (synopsis "Basic sfArk decompressor")
      (description "SfArk extractor converts SoundFonts in the compressed legacy
sfArk file format to the uncompressed sf2 format.")
      (license license:gpl3+))))

(define-public libmspack
  (package
    (name "libmspack")
    (home-page "https://cabextract.org.uk/libmspack/")
    (version "0.10.1")
    (source
     (origin
      (method url-fetch)
      (uri (string-append home-page name "-" version "alpha.tar.gz"))
      (sha256
       (base32 "13janaqsvm7aqc4agjgd4819pbgqv50j88bh5kci1z70wvg65j5s"))))
    (build-system gnu-build-system)
    (arguments
     `(#:configure-flags '("--disable-static")))
    (synopsis "Compression tools for some formats used by Microsoft")
    (description
     "The purpose of libmspack is to provide both compression and
decompression of some loosely related file formats used by Microsoft.")
    (license license:lgpl2.1+)))

(define-public lz4
  (package
    (name "lz4")
    (version "1.8.1.2")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference (url "https://github.com/lz4/lz4")
                           (commit (string-append "v" version))))
       (sha256
        (base32
         "1jggv4lvfav53advnj0pwqgxzn868lrj8dc9zp73iwvqlj82mhmx"))
       (file-name (git-file-name name version))))
    (build-system gnu-build-system)
    (native-inputs `(("valgrind" ,valgrind)))   ; for tests
    (arguments
     `(#:test-target "test"
       #:make-flags (list "CC=gcc"
                          (string-append "prefix=" (assoc-ref %outputs "out")))
       #:phases (modify-phases %standard-phases
                  (delete 'configure))))        ; no configure script
    (home-page "https://www.lz4.org")
    (synopsis "Compression algorithm focused on speed")
    (description "LZ4 is a lossless compression algorithm, providing
compression speed at 400 MB/s per core (0.16 Bytes/cycle).  It also features an
extremely fast decoder, with speed in multiple GB/s per core (0.71 Bytes/cycle).
A high compression derivative, called LZ4_HC, is also provided.  It trades CPU
time for compression ratio.")
    ;; The libraries (lz4, lz4hc, and xxhash) are BSD licenced. The command
    ;; line interface programs (lz4, fullbench, fuzzer, datagen) are GPL2+.
    (license (list license:bsd-2 license:gpl2+))))

(define-public squashfs-tools
  (package
    (name "squashfs-tools")
    (version "4.3")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/squashfs/squashfs/"
                                  "squashfs" version "/"
                                  "squashfs" version ".tar.gz"))
              (sha256
               (base32
                "1xpklm0y43nd9i6jw43y2xh5zvlmj9ar2rvknh0bh7kv8c95aq0d"))))
    (build-system gnu-build-system)
    (arguments
     '(#:tests? #f ; no check target
       #:make-flags
       (list "CC=gcc"
             "XZ_SUPPORT=1"
             "LZO_SUPPORT=1"
             "LZ4_SUPPORT=1"
             (string-append "INSTALL_DIR=" %output "/bin"))
       #:phases
       (modify-phases %standard-phases
         (replace 'configure
           (lambda _
             (chdir "squashfs-tools")
             #t))
         (add-after 'unpack 'fix-glibc-compatability
           (lambda _
             (substitute* '("squashfs-tools/mksquashfs.c"
                            "squashfs-tools/unsquashfs.c")
               (("<sys/sysinfo.h>")
                "<sys/sysinfo.h>\n#include <sys/sysmacros.h>"))
             #t)))))
    (inputs
     `(("lz4" ,lz4)
       ("lzo" ,lzo)
       ("xz" ,xz)
       ("zlib" ,zlib)))
    (home-page "http://squashfs.sourceforge.net/")
    (synopsis "Tools to create and extract squashfs file systems")
    (description
     "Squashfs is a highly compressed read-only file system for Linux.  It uses
zlib to compress files, inodes, and directories.  All blocks are packed to
minimize the data overhead, and block sizes of between 4K and 1M are supported.
It is intended to be used for archival use, for live CDs, and for embedded
systems where low overhead is needed.  This package allows you to create and
extract such file systems.")
    (license license:gpl2+)))

;; We need this for building squashfs images with symlinks.
(define-public squashfs-tools-next
  (let ((commit "fb33dfc32b131a1162dcf0e35bd88254ae10e265")
        (revision "1"))
    (package (inherit squashfs-tools)
      (name "squashfs-tools-next")
      (version (string-append "4.3-" revision (string-take commit 7)))
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/plougher/squashfs-tools.git")
                      (commit commit)))
                (file-name (git-file-name name version))
                (sha256
                 (base32
                  "1x2skf8hxzfch978nzx5mh46d4hhi6gl22270hiarjszsjk3bnsx")))))))

(define-public pigz
  (package
    (name "pigz")
    (version "2.4")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://zlib.net/pigz/"
                                  name "-" version ".tar.gz"))
              (sha256
               (base32
                "0wsgw5vwl23jrnpsvd8v3xcp5k4waw5mk0164fynjhkv58i1dy54"))))
    (build-system gnu-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (delete 'configure)
         (replace 'install
                  (lambda* (#:key outputs #:allow-other-keys)
                    (let* ((out (assoc-ref outputs "out"))
                           (bin (string-append out "/bin"))
                           (man (string-append out "/share/man/man1")))
                      (install-file "pigz" bin)
                      (symlink "pigz" (string-append bin  "/unpigz"))
                      (install-file "pigz.1" man)
                      #t))))
       #:make-flags (list "CC=gcc")
       #:test-target "tests"))
    (inputs `(("zlib" ,zlib)))
    (home-page "https://zlib.net/pigz/")
    (synopsis "Parallel implementation of gzip")
    (description
     "This package provides a parallel implementation of gzip that exploits
multiple processors and multiple cores when compressing data.")

    ;; Things under zopfli/ are under ASL2.0, but 4 files at the top-level,
    ;; written by Mark Adler, are under another non-copyleft license.
    (license license:asl2.0)))

(define-public pixz
  (package
    (name "pixz")
    (version "1.0.6")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "https://github.com/vasi/pixz/releases/download/v" version
                    "/pixz-" version ".tar.xz"))
              (sha256
               (base32
                "1s3j7zw6j5zi3fhdxg287ndr3wf6swac7z21mqd1pyiln530gi82"))))
    (build-system gnu-build-system)
    (native-inputs
     `(("pkg-config" ,pkg-config)
       ("libarchive" ,libarchive)))
    (home-page "https://github.com/vasi/pixz")
    (synopsis "Parallel indexing implementation of LZMA")
    (description
     "The existing XZ Utils provide great compression in the .xz file format,
but they produce just one big block of compressed data.  Pixz instead produces
a collection of smaller blocks which makes random access to the original data
possible and can compress in parallel.  This is especially useful for large
tarballs.")
    (license license:bsd-2)))

(define-public brotli
  (let ((commit "e992cce7a174d6e2b3486616499d26bb0bad6448")
        (revision "1"))
    (package
      (name "brotli")
      (version (string-append "0.1-" revision "."
                              (string-take commit 7)))
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/bagder/libbrotli.git")
                      (commit commit)
                      (recursive? #t)))
                (file-name (string-append name "-" version ".tar.xz"))
                (sha256
                 (base32
                  "1qxxsasvwbbbh6dl3138y9h3fg0q2v7xdk5jjc690bdg7g1wrj6n"))
                (modules '((guix build utils)))
                (snippet '(begin
                            ;; This is a recursive submodule that is
                            ;; unnecessary for this package, so delete it.
                            (delete-file-recursively "brotli/terryfy")
                            #t))))
      (build-system gnu-build-system)
      (native-inputs
       `(("autoconf" ,autoconf)
         ("automake" ,automake)
         ("libtool" ,libtool)))
      (arguments
       `(#:phases (modify-phases %standard-phases
                    (add-after 'unpack 'autogen
                      (lambda _
                        (mkdir "m4")
                        (invoke "autoreconf" "-vfi"))))))
      (home-page "https://github.com/bagder/libbrotli/")
      (synopsis "Implementation of the Brotli compression algorithm")
      (description
       "Brotli is a general-purpose lossless compression algorithm.  It is
similar in speed to deflate but offers denser compression.  This package
provides encoder and a decoder libraries: libbrotlienc and libbrotlidec,
respectively, based on the reference implementation from Google.")
      (license license:expat))))

(define-public bsdiff
  (package
    (name "bsdiff")
    (version "4.3")
    (home-page "https://www.daemonology.net/bsdiff/")
    (source (origin
              (method url-fetch)
              (uri (string-append home-page name "-" version ".tar.gz"))
              (sha256
               (base32
                "0j2zm3z271x5aw63mwhr3vymzn45p2vvrlrpm9cz2nywna41b0hq"))))
    (build-system gnu-build-system)
    (arguments
     `(#:make-flags (list "INSTALL=install" "CC=gcc"
                          (string-append "PREFIX=" (assoc-ref %outputs "out")))
       #:phases (modify-phases %standard-phases
                  (delete 'configure)
                  (add-before 'build 'fix-Makefile
                    (lambda _
                      (substitute* "Makefile"
                        ;; Adjust syntax to make it compatible with GNU Make.
                        (("^\\.") "")
                        ;; Help install(1) create the target directory.
                        (("\\$\\{PREFIX\\}") "-D -t ${PREFIX}"))
                      #t)))
       #:tests? #f)) ;no tests
    (inputs
     `(("bzip2" ,bzip2)))
    (synopsis "Patch binary files")
    (description
     "@command{bsdiff} and @command{bspatch} are tools for building and
applying patches to binary files.  By using suffix sorting (specifically
Larsson and Sadakane's @code{qsufsort}) and taking advantage of how
executable files change, bsdiff routinely produces binary patches 50-80%
smaller than those produced by @code{Xdelta}.")
    (license license:bsd-2)))

(define-public cabextract
 (package
   (name "cabextract")
   (home-page "https://cabextract.org.uk/")
   (version "1.9.1")
   (source (origin
              (method url-fetch)
              (uri (string-append home-page "cabextract-" version ".tar.gz"))
              (sha256
               (base32
                "19qwhl2r8ip95q4vxzxg2kp4p125hjmc9762sns1dwwf7ikm7hmg"))
              (modules '((guix build utils)))
              (snippet
               '(begin
                  ;; Delete bundled libmspack.
                  (delete-file-recursively "mspack")
                  #t))))
    (build-system gnu-build-system)
    (arguments
     '(#:configure-flags '("--with-external-libmspack")
       #:phases
       (modify-phases %standard-phases
         ;; cabextract needs some of libmspack's header files.
         ;; These are located in the "mspack" directory of libmspack.
         (add-before 'build 'unpack-libmspack
           (lambda* (#:key inputs #:allow-other-keys)
             (let ((dir-name "libmspack-src"))
               (mkdir dir-name)
               (invoke "tar" "-xvf" (assoc-ref inputs "libmspack-source")
                       "-C" dir-name "--strip-components" "1")
               (rename-file (string-append dir-name "/mspack")
                            "mspack")
               (delete-file-recursively dir-name)
               #t))))))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (inputs
     `(("libmspack" ,libmspack)
       ("libmspack-source" ,(package-source libmspack))))
    (synopsis "Tool to unpack Cabinet archives")
    (description "Extracts files out of Microsoft Cabinet (.cab) archives")
    ;; Some source files specify gpl2+, lgpl2+, however COPYING is gpl3.
    (license license:gpl3+)))

(define-public xdelta
  (package
    (name "xdelta")
    (version "3.1.0")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/jmacd/xdelta.git")
             (commit (string-append "v" version))))
       (file-name (git-file-name name version))
       (sha256
        (base32
         "09mmsalc7dwlvgrda56s2k927rpl3a5dzfa88aslkqcjnr790wjy"))
       (snippet
        ;; This file isn't freely distributable and has no effect on building.
        '(begin
           (delete-file "xdelta3/draft-korn-vcdiff.txt")
           #t))))
    (build-system gnu-build-system)
    (native-inputs
     `(("autoconf" ,autoconf)
       ("automake" ,automake)))
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'enter-build-directory
           (lambda _ (chdir "xdelta3") #t)))))
    (home-page "http://xdelta.org")
    (synopsis "Delta encoder for binary files")
    (description "xdelta encodes only the differences between two binary files
using the VCDIFF algorithm and patch file format described in RFC 3284.  It can
also be used to apply such patches.  xdelta is similar to @command{diff} and
@command{patch}, but is not limited to plain text and does not generate
human-readable output.")
    (license license:asl2.0)))

(define-public lrzip
  (package
    (name "lrzip")
    (version "0.631")
    (source
     (origin
       (method url-fetch)
       (uri (string-append
             "http://ck.kolivas.org/apps/lrzip/lrzip-" version ".tar.bz2"))
       (sha256
        (base32
         "0mb449vmmwpkalq732jdyginvql57nxyd31sszb108yps1lf448d"))
       (patches (search-patches "lrzip-CVE-2017-8842.patch"))))
    (build-system gnu-build-system)
    (native-inputs
     `(;; nasm is only required when building for 32-bit x86 platforms
       ,@(if (string-prefix? "i686" (or (%current-target-system)
                                        (%current-system)))
             `(("nasm" ,nasm))
             '())
       ("perl" ,perl)))
    (inputs
     `(("bzip2" ,bzip2)
       ("lzo" ,lzo)
       ("zlib" ,zlib)))
    (home-page "http://ck.kolivas.org/apps/lrzip/")
    (synopsis "Large file compressor with a very high compression ratio")
    (description "lrzip is a compression utility that uses long-range
redundancy reduction to improve the subsequent compression ratio of
larger files.  It can then further compress the result with the ZPAQ or
LZMA algorithms for maximum compression, or LZO for maximum speed.  This
choice between size or speed allows for either better compression than
even LZMA can provide, or a higher speed than gzip while compressing as
well as bzip2.")
    (license (list license:gpl3+
                   license:public-domain)))) ; most files in lzma/

(define-public snappy
  (package
    (name "snappy")
    (version "1.1.7")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "https://github.com/google/snappy/archive/"
                           version ".tar.gz"))
       (file-name (string-append "snappy-" version ".tar.gz"))
       (sha256
        (base32 "1m7rcdqzkys5lspj8jcsaah8w33zh28s771bw0ga2lgzfgl05yix"))
       (patches (search-patches "snappy-add-O2-flag-in-CmakeLists.txt.patch"))))
    (build-system cmake-build-system)
    (arguments
     `(#:configure-flags '("-DBUILD_SHARED_LIBS=ON")))
    (home-page "https://github.com/google/snappy")
    (synopsis "Fast compressor/decompressor")
    (description "Snappy is a compression/decompression library.  It does not
aim for maximum compression, or compatibility with any other compression library;
instead, it aims for very high speeds and reasonable compression.  For instance,
compared to the fastest mode of zlib, Snappy is an order of magnitude faster
for most inputs, but the resulting compressed files are anywhere from 20% to
100% bigger.")
    (license license:asl2.0)))

(define-public p7zip
  (package
    (name "p7zip")
    (version "16.02")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/" name "/" name "/"
                                  version "/" name "_" version
                                  "_src_all.tar.bz2"))
              (sha256
               (base32
                "07rlwbbgszq8i7m8jh3x6j2w2hc9a72dc7fmqawnqkwlwb00mcjy"))
              (modules '((guix build utils)))
              (snippet
               '(begin
                  ;; Remove non-free source files
                  (for-each delete-file
                            (append
                             (find-files "CPP/7zip/Compress" "Rar.*")
                             (find-files "CPP/7zip/Crypto" "Rar.*")
                             (find-files "DOC/unRarLicense.txt")
                             (find-files  "Utils/file_Codecs_Rar_so.py")))
                  (delete-file-recursively "CPP/7zip/Archive/Rar")
                  (delete-file-recursively "CPP/7zip/Compress/Rar")
                  #t))
              (patches (search-patches "p7zip-CVE-2016-9296.patch"
                                       "p7zip-CVE-2017-17969.patch"
                                       "p7zip-remove-unused-code.patch"))))
    (build-system gnu-build-system)
    (arguments
     `(#:make-flags
       (list (string-append "DEST_HOME=" (assoc-ref %outputs "out")) "all3")
       #:phases
       (modify-phases %standard-phases
         (replace 'configure
           (lambda* (#:key system outputs #:allow-other-keys)
             (invoke "cp"
                     (let ((system ,(or (%current-target-system)
                                        (%current-system))))
                       (cond
                        ((string-prefix? "x86_64" system)
                         "makefile.linux_amd64_asm")
                        ((string-prefix? "i686" system)
                         "makefile.linux_x86_asm_gcc_4.X")
                        (else
                         "makefile.linux_any_cpu_gcc_4.X")))
                     "makefile.machine")))
         (replace 'check
           (lambda _
             (invoke "make" "test")
             (invoke "make" "test_7z")
             (invoke "make" "test_7zr"))))))
    (inputs
     (let ((system (or (%current-target-system)
                       (%current-system))))
       `(,@(cond ((string-prefix? "x86_64" system)
                  `(("yasm" ,yasm)))
                 ((string-prefix? "i686" system)
                  `(("nasm" ,nasm)))
                 (else '())))))
    (home-page "http://p7zip.sourceforge.net/")
    (synopsis "Command-line file archiver with high compression ratio")
    (description "p7zip is a command-line port of 7-Zip, a file archiver that
handles the 7z format which features very high compression ratios.")
    (license (list license:lgpl2.1+
                   license:gpl2+
                   license:public-domain))))

(define-public gzstream
  (package
    (name "gzstream")
    (version "1.5")
    (source (origin
              (method url-fetch)
              (uri
                ;; No versioned URL, but last release was in 2003.
                "http://www.cs.unc.edu/Research/compgeom/gzstream/gzstream.tgz")
                (file-name (string-append name "-" version ".tgz"))
                (sha256
                 (base32
                  "00y19pqjsdj5zcrx4p9j56pl73vayfwnb7y2hvp423nx0cwv5b4r"))
                (modules '((guix build utils)))
                (snippet
                 ;; Remove pre-compiled object.
                 '(begin
                    (delete-file "gzstream.o")
                    #t))))
    (build-system gnu-build-system)
    (arguments
     `(#:test-target "test"
       #:phases
       (modify-phases %standard-phases
         (delete 'configure)
         (replace 'install
           (lambda* (#:key outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (lib (string-append out "/lib"))
                    (include (string-append out "/include")))
               (install-file "libgzstream.a" lib)
               (install-file "gzstream.h" include)
               #t))))))
    (propagated-inputs `(("zlib" ,zlib)))
    (home-page "http://www.cs.unc.edu/Research/compgeom/gzstream/")
    (synopsis "Compressed C++ iostream")
    (description "gzstream is a small library for providing zlib
functionality in a C++ iostream.")
    (license license:lgpl2.1+)))

(define-public zpaq
  (package
    (name "zpaq")
    (version "7.15")
    (source
     (origin
       (method url-fetch/zipbomb)
       (uri (string-append "http://mattmahoney.net/dc/zpaq"
                           (string-delete #\. version) ".zip"))
       (sha256
        (base32
         "066l94yyladlfzri877nh2dhkvspagjn3m5bmv725fmhkr9c4pp8"))
       (modules '((guix build utils)))
       (snippet
        ;; Delete irrelevant pre-compiled binaries.
        '(begin
           (for-each delete-file (find-files "." "\\.exe$"))
           #t))))
    (build-system gnu-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (delete 'configure))           ; no ‘configure’ script
       #:make-flags
       (list
        (string-append "CPPFLAGS=-Dunix"
                       ,(match (or (%current-target-system)
                                   (%current-system))
                               ("x86_64-linux"  "")
                               ("i686-linux"    "")
                               (_               " -DNOJIT")))
        ;; These should be safe, lowest-common-denominator instruction sets,
        ;; allowing for some optimisation while remaining reproducible.
        (string-append "CXXFLAGS=-O3 -DNDEBUG"
                       ,(match (or (%current-target-system)
                                   (%current-system))
                               ("x86_64-linux"  " -march=nocona -mtune=generic")
                               ("i686-linux"    " -march=i686 -mtune=generic")
                               ("armhf-linux"   " -mtune=generic-armv7-a")
                               (_               "")))
        (string-append "PREFIX="
                       (assoc-ref %outputs "out")))))
    (native-inputs
     `(("perl" ,perl)))                 ; for pod2man
    (home-page "http://mattmahoney.net/dc/zpaq.html")
    (synopsis "Incremental journaling archiver")
    (description "ZPAQ is a command-line archiver for realistic situations with
many duplicate and already compressed files.  It backs up only those files
modified since the last update.  All previous versions remain untouched and can
be independently recovered.  Identical files are only stored once (known as
@dfn{de-duplication}).  Archives can also be encrypted.

ZPAQ is intended to back up user data, not entire operating systems.  It ignores
owner and group IDs, ACLs, extended attributes, or special file types like
devices, sockets, or named pipes.  It does not follow or restore symbolic links
or junctions, and always follows hard links.")
    (license (list license:public-domain
                   ;; libzpaq.cpp contains a mix of public-domain and
                   ;; expat-licenced (or ‘MIT’) code.
                   license:expat))))

(define-public unshield
  (package
    (name "unshield")
    (version "1.4.3")
    (source
     (origin (method url-fetch)
             (uri (string-append "http://github.com/twogood/unshield/archive/"
                                 version ".tar.gz"))
             (file-name (string-append name "-" version ".tar.gz"))
             (sha256
              (base32
               "1avv5c11jbmzwizq10pwvlh1dmyna8ccvpgacv95h4gbq26rg35a"))))
    (build-system cmake-build-system)
    (inputs
     `(("zlib" ,zlib)
       ("openssl" ,openssl)
       ;; Test data that is otherwise downloaded with curl.
       ("unshield-avigomanager11b22.zip"
        ,(origin
           (method url-fetch)
           (uri (string-append
                 "https://www.dropbox.com/s/8r4b6752swe3nhu/"
                 "unshield-avigomanager11b22.zip?dl=1"))
           (sha256
            (base32 "0fwq7lih04if68wpwpsk5wjqyvh32db76a41sq6gbx4dn1lc3ddn"))
           (file-name "unshield-avigomanager11b22.zip")))
       ("unshield-baldurs_gate_patch_v1_1_4315_international.zip"
        ,(origin
           (method url-fetch)
           (uri (string-append
                 "https://www.dropbox.com/s/9ruil8oi6amjbbk/"
                 "unshield-baldurs_gate_patch_v1_1_4315_international.zip?dl=1"))
           (sha256
            (base32 "0spaxf6dardlhqxz3ys09fzamj007q3nfyw4xng6gh3qp9780maj"))
           (file-name "unshield-baldurs_gate_patch_v1_1_4315_international.zip")))
       ("unshield-the-feeble-files-spanish.zip"
        ,(origin
           (method url-fetch)
           (uri (string-append
                 "https://www.dropbox.com/s/1ng0z9kfxc7eb1e/"
                 "unshield-the-feeble-files-spanish.zip?dl=1"))
           (sha256
            (base32 "1k5cw6vnpja8yjlnhx5124xrw9i8s1l539hfdqqrqz3l5gn0bnyd"))
           (file-name "unshield-the-feeble-files-spanish.zip")))))
    (native-inputs
     `(("unzip" ,unzip)))
    (arguments
     `(#:out-of-source? #f
       #:phases
       (modify-phases %standard-phases
         (add-before 'check 'pre-check
           (lambda* (#:key inputs #:allow-other-keys)
             (for-each (lambda (i)
                         (copy-file (assoc-ref inputs i)
                                    (string-append "test/v0/" i)))
                       '("unshield-avigomanager11b22.zip"
                         "unshield-baldurs_gate_patch_v1_1_4315_international.zip"
                         "unshield-the-feeble-files-spanish.zip"))
             (substitute* (find-files "test/" "/*\\.sh")
               ;; Tests expect the unshield binary in a specific
               ;; location.
               (("/var/tmp/unshield/bin/unshield")
                (string-append (getcwd) "/src/unshield"))
               ;; We no longer need to download the data.
               ((".?URL=.*$") "")
               (("curl -(|f)sSL -o test.zip .*") ""))
             (substitute* "test/v0/avigomanager.sh"
               (("test.zip")
                (string-append (getcwd)
                               "/test/v0/unshield-avigomanager11b22.zip")))
             (substitute* "test/v0/baldurs_gate_patch_v1_1_4315_international.sh"
               (("test.zip")
                (string-append
                 (getcwd)
                 "/test/v0/unshield-baldurs_gate_patch_v1_1_4315_international.zip")))
             (substitute* "test/v0/the-feeble-files-spanish.sh"
               (("test.zip")
                (string-append (getcwd)
                               "/test/v0/unshield-the-feeble-files-spanish.zip")))
             #t))
         (replace 'check
           (lambda _
             (invoke "./run-tests.sh"))))))
    (home-page "https://github.com/twogood/unshield")
    (synopsis "Extract CAB files from InstallShield installers")
    (description
     "@command{unshield} is a tool and library for extracting @file{.cab}
 archives from InstallShield installers.")
    (license license:expat)))

(define-public zstd
  (package
    (name "zstd")
    (version "1.3.8")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "https://github.com/facebook/zstd/releases/download/"
                           "v" version "/zstd-" version ".tar.gz"))
       (sha256
        (base32 "13nlsqhkn276frxrzjdn7wz0j9zz414lf336885ykyxcvw2a0gr9"))))
    (build-system gnu-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (delete 'configure))           ; no configure script
       #:make-flags
       (list "CC=gcc"
             (string-append "PREFIX=" (assoc-ref %outputs "out"))
             ;; Skip auto-detection of, and creating a dependency on, the build
             ;; environment's ‘xz’ for what amounts to a dubious feature anyway.
             "HAVE_LZMA=0"
             ;; Not currently detected, but be explicit & avoid surprises later.
             "HAVE_LZ4=0"
             "HAVE_ZLIB=0")))
    (home-page "https://facebook.github.io/zstd/")
    (synopsis "Zstandard real-time compression algorithm")
    (description "Zstandard (@command{zstd}) is a lossless compression algorithm
that combines very fast operation with a compression ratio comparable to that of
zlib.  In most scenarios, both compression and decompression can be performed in
‘real time’.  The compressor can be configured to provide the most suitable
trade-off between compression ratio and speed, without affecting decompression
speed.")
    (license (list license:bsd-3         ; the main top-level LICENSE file
                   license:bsd-2         ; many files explicitly state 2-Clause
                   license:gpl2          ; the main top-level COPYING file
                   license:gpl3+         ; tests/gzip/*.sh
                   license:expat         ; lib/dictBuilder/divsufsort.[ch]
                   license:public-domain ; zlibWrapper/examples/fitblk*
                   license:zlib))))      ; zlibWrapper/{gz*.c,gzguts.h}

(define-public pzstd
  (package
    (name "pzstd")
    (version (package-version zstd))
    (source (package-source zstd))
    (build-system gnu-build-system)
    (native-inputs
     `(("googletest" ,googletest)))
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'enter-subdirectory
           (lambda _ (chdir "contrib/pzstd") #t))
         (delete 'configure)            ; no configure script
         (add-before 'check 'compile-tests
           (lambda* (#:key make-flags #:allow-other-keys)
             (apply invoke "make" "tests" make-flags)))
         (add-after 'install 'install-documentation
           (lambda* (#:key outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (doc (string-append out "/share/doc/" ,name)))
               (mkdir-p doc)
               (install-file "README.md" doc)
               #t))))
       #:make-flags
       (list "CC=gcc"
             (string-append "PREFIX=" (assoc-ref %outputs "out")))))
    (home-page (package-home-page zstd))
    (synopsis "Threaded implementation of the Zstandard compression algorithm")
    (description "Parallel Zstandard (PZstandard or @command{pzstd}) is a
multi-threaded implementation of the @uref{http://zstd.net/, Zstandard
compression algorithm}.  It is fully compatible with the original Zstandard file
format and command-line interface, and can be used as a drop-in replacement.

Compression is distributed over multiple processor cores to improve performance,
as is the decompression of data compressed in this manner.  Data compressed by
other implementations will only be decompressed by two threads: one performing
the actual decompression, the other input and output.")
    (license (package-license zstd))))

(define-public zip
  (package
    (name "zip")
    (version "3.0")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://sourceforge/infozip"
                           "/Zip%203.x%20%28latest%29/3.0/zip30.tar.gz"))
       (sha256
        (base32
         "0sb3h3067pzf3a7mlxn1hikpcjrsvycjcnj9hl9b1c3ykcgvps7h"))))
    (build-system gnu-build-system)
    (inputs `(("bzip2" ,bzip2)))
    (arguments
     `(#:tests? #f ; no test target
       #:make-flags (let ((out (assoc-ref %outputs "out")))
                      (list "-f" "unix/Makefile"
                            (string-append "prefix=" out)
                            (string-append "MANDIR=" out "/share/man/man1")))
       #:phases
       (modify-phases %standard-phases
         (replace 'build
           (lambda* (#:key (make-flags '()) #:allow-other-keys)
             (apply invoke "make" "generic_gcc" make-flags)))
         (delete 'configure))))
    (home-page "http://www.info-zip.org/Zip.html")
    (synopsis "Compression and file packing utility")
    (description
     "Zip is a compression and file packaging/archive utility.  Zip is useful
for packaging a set of files for distribution, for archiving files, and for
saving disk space by temporarily compressing unused files or directories.
Zip puts one or more compressed files into a single ZIP archive, along with
information about the files (name, path, date, time of last modification,
protection, and check information to verify file integrity).  An entire
directory structure can be packed into a ZIP archive with a single command.

Zip has one compression method (deflation) and can also store files without
compression.  Zip automatically chooses the better of the two for each file.
Compression ratios of 2:1 to 3:1 are common for text files.")
    (license (license:non-copyleft "file://LICENSE"
                                   "See LICENSE in the distribution."))))

(define-public unzip
  (package (inherit zip)
    (name "unzip")
    (version "6.0")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://sourceforge/infozip"
                           "/UnZip%206.x%20%28latest%29/UnZip%206.0/unzip60.tar.gz"))
       (sha256
        (base32
         "0dxx11knh3nk95p2gg2ak777dd11pr7jx5das2g49l262scrcv83"))
       (patches (search-patches "unzip-CVE-2014-8139.patch"
                                "unzip-CVE-2014-8140.patch"
                                "unzip-CVE-2014-8141.patch"
                                "unzip-CVE-2014-9636.patch"
                                "unzip-CVE-2015-7696.patch"
                                "unzip-CVE-2015-7697.patch"
                                "unzip-allow-greater-hostver-values.patch"
                                "unzip-initialize-symlink-flag.patch"
                                "unzip-remove-build-date.patch"
                                "unzip-attribs-overflow.patch"
                                "unzip-overflow-on-invalid-input.patch"
                                "unzip-format-secure.patch"
                                "unzip-overflow-long-fsize.patch"))))
    (build-system gnu-build-system)
    ;; no inputs; bzip2 is not supported, since not compiled with BZ_NO_STDIO
    (arguments
     `(#:phases (modify-phases %standard-phases
                  (delete 'configure)
                  (add-after 'unpack 'fortify
                    (lambda _
                      ;; Mitigate CVE-2018-1000035, an exploitable buffer overflow.
                      ;; This environment variable is recommended in 'unix/Makefile'
                      ;; for passing flags to the C compiler.
                      (setenv "LOCAL_UNZIP" "-D_FORTIFY_SOURCE=1")
                      #t))
                  (replace 'build
                    (lambda* (#:key make-flags #:allow-other-keys)
                      (apply invoke "make"
                             `("-j" ,(number->string
                                      (parallel-job-count))
                               ,@make-flags
                               "generic_gcc")))))
       #:make-flags (list "-f" "unix/Makefile"
                          (string-append "prefix=" %output)
                          (string-append "MANDIR=" %output "/share/man/man1"))))
    (home-page "http://www.info-zip.org/UnZip.html")
    (synopsis "Decompression and file extraction utility")
    (description
     "UnZip is an extraction utility for archives compressed in .zip format,
also called \"zipfiles\".

UnZip lists, tests, or extracts files from a .zip archive.  The default
behaviour (with no options) is to extract into the current directory, and
subdirectories below it, all files from the specified zipfile.  UnZip
recreates the stored directory structure by default.")
    (license (license:non-copyleft "file://LICENSE"
                                   "See LICENSE in the distribution."))))

(define-public zziplib
  (package
    (name "zziplib")
    (version "0.13.69")
    (home-page "https://github.com/gdraheim/zziplib")
    (source
     (origin
       (method url-fetch)
       (uri (string-append home-page "/archive/v" version ".tar.gz"))
       (sha256
        (base32
         "0i052a7shww0fzsxrdp3rd7g4mbzx7324a8ysbc0br7frpblcql4"))))
    (build-system gnu-build-system)
    (inputs
     `(("zlib" ,zlib)))
    (native-inputs `(("perl" ,perl)     ; for the documentation
                     ("pkg-config" ,pkg-config)
                     ;; for the documentation; Python 3 not supported,
                     ;; http://forums.gentoo.org/viewtopic-t-863161-start-0.html
                     ("python" ,python-2)
                     ("zip" ,zip))) ; to create test files
    (synopsis "Library for accessing zip files")
    (description
     "ZZipLib is a library based on zlib for accessing zip files.")
    ;; zziplib is dual licensed under LGPL2.0+ and MPL1.1.  Some example source
    ;; files carry the Zlib license; see "docs/copying.html" for details.
    (license (list license:lgpl2.0+ license:mpl1.1))))

(define-public libzip
  (package
    (name "libzip")
    (version "1.5.1")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "https://libzip.org/download/" name "-" version ".tar.xz"))
              (sha256
               (base32
                "0wnkkvkq90wyawj9221i77sf3nix1vj3ygzdy59k8yvcjnv3bsh4"))))
    (native-inputs
     `(("perl" ,perl)))
    (inputs
     `(("zlib" ,zlib)))
    (build-system cmake-build-system)
    (home-page "https://libzip.org")
    (synopsis "C library for reading, creating, and modifying zip archives")
    (description "Libzip is a C library for reading, creating, and modifying
zip archives.  Files can be added from data buffers, files, or compressed data
copied directly from other zip archives.  Changes made without closing the
archive can be reverted.")
    (license license:bsd-3)))

(define-public atool
  (package
    (name "atool")
    (version "0.39.0")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "http://savannah.nongnu.org/download/atool/atool-"
                           version ".tar.gz"))
       (sha256
        (base32
         "0fvhzip2v08jgnlfpyj6rapan39xlsl1ksgq4lp8gfsai2ah1xma"))))
    (build-system gnu-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'embed-absolute-file-name
           (lambda* (#:key inputs #:allow-other-keys)
             (substitute* "atool"
               (("(^\\$::cfg_path_file.*= )'file'" _ pre)
                (string-append pre "'" (assoc-ref inputs "file")
                               "/bin/file'")))
             #t)))))
    (inputs
     `(("perl" ,perl)
       ("file" ,file)))
    (home-page "https://www.nongnu.org/atool/")
    (synopsis  "Universal tool to manage file archives of various types")
    (description "The main command is @command{aunpack} which extracts files
from an archive.  The other commands provided are @command{apack} (to create
archives), @command{als} (to list files in archives), and @command{acat} (to
extract files to standard out).  As @command{atool} invokes external programs
to handle the archives, not all commands may be supported for a certain type
of archives.")
    (license license:gpl2+)))

(define-public lunzip
  (package
    (name "lunzip")
    (version "1.11")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://savannah/lzip/lunzip/"
                           "lunzip-" version ".tar.gz"))
       (sha256
        (base32 "19zq3gmlbia2krq4k4zs1j0xjdv7nsdzqvfb0pyca5n53h2mzb91"))))
    (build-system gnu-build-system)
    (arguments
     `(#:configure-flags
       (list "CC=gcc")))
    (home-page "https://www.nongnu.org/lzip/lunzip.html")
    (synopsis "Small, stand-alone lzip decompressor")
    (description
     "Lunzip is a decompressor for files in the lzip compression format (.lz),
written as a single small C tool with no dependencies.  This makes it
well-suited to embedded and other systems without a C++ compiler, or for use in
applications such as software installers that need only to decompress files,
not compress them.
Lunzip is intended to be fully compatible with the regular lzip package.")
    (license (list license:bsd-2        ; carg_parser.[ch]
                   license:gpl2+))))    ; everything else

(define-public clzip
  (package
    (name "clzip")
    (version "1.11")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://savannah/lzip/clzip/"
                           "clzip-" version ".tar.gz"))
       (sha256
        (base32 "1h14dmc9fi10gcdpdpbgq1bwvcxvivppilj64pf720x8mw915mfr"))))
    (build-system gnu-build-system)
    (arguments
     `(#:configure-flags
       (list "CC=gcc")))
    (home-page "https://www.nongnu.org/lzip/clzip.html")
    (synopsis "Small, stand-alone lzip compressor and decompressor")
    (description
     "Clzip is a compressor and decompressor for files in the lzip compression
format (.lz), written as a single small C tool with no dependencies.  This makes
it well-suited to embedded and other systems without a C++ compiler, or for use
in other applications like package managers.
Clzip is intended to be fully compatible with the regular lzip package.")
    (license (list license:bsd-2        ; carg_parser.[ch], lzd in clzip.texi
                   license:gpl2+))))

(define-public lzlib
  (package
    (name "lzlib")
    (version "1.11")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://savannah/lzip/lzlib/"
                           "lzlib-" version ".tar.gz"))
       (sha256
        (base32 "0djdj4sg33rzi4k84cygvnp09bfsv6i8wy2k7i67rayib63myp3c"))))
    (build-system gnu-build-system)
    (arguments
     `(#:configure-flags
       (list "CC=gcc"
             "--enable-shared")))       ; only static (.a) is built by default
    (home-page "https://www.nongnu.org/lzip/lzlib.html")
    (synopsis "Lzip data compression C library")
    (description
     "Lzlib is a C library for in-memory LZMA compression and decompression in
the lzip format.  It supports integrity checking of the decompressed data, and
all functions are thread-safe.  The library should never crash, even in case of
corrupted input.")
    (license (list license:bsd-2        ; the library itself
                   license:gpl2+))))    ; main.c (i.e. minilzip used by tests)

(define-public plzip
  (package
    (name "plzip")
    (version "1.8")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://savannah/lzip/plzip/"
                           "plzip-" version ".tar.gz"))
       (sha256
        (base32 "04indil809qgfmz776imb3dnhkysh7zk28jcv3mw0ahl2lyaxbzd"))))
    (build-system gnu-build-system)
    (inputs
     `(("lzlib" ,lzlib)))
    (home-page "https://www.nongnu.org/lzip/plzip.html")
    (synopsis "Parallel lossless data compressor for the lzip format")
    (description
     "Plzip is a massively parallel (multi-threaded) lossless data compressor
and decompressor that uses the lzip file format (.lz).  Files produced by plzip
are fully compatible with lzip and can be rescued with lziprecover.
On multiprocessor machines, plzip can compress and decompress large files much
faster than lzip, at the cost of a slightly reduced compression ratio (0.4% to
2%).  The number of usable threads is limited by file size: on files of only a
few MiB, plzip is no faster than lzip.
Files that were compressed with regular lzip will also not be decompressed
faster by plzip, unless the @code{-b} option was used: lzip usually produces
single-member files which can't be decompressed in parallel.")
    (license (list license:bsd-2        ; arg_parser.{cc,h}
                   license:gpl2+))))    ; everything else

(define-public innoextract
  (package
   (name "innoextract")
   (version "1.7")
   (source
    (origin
     (method url-fetch)
     (uri (string-append "https://github.com/dscharrer/innoextract/archive/"
                         version ".tar.gz"))
     (sha256
      (base32
       "0khwi9f0q0h6xfbixrrc1rfpgj0b7ajwilq7yhmxnn5lpc807f6x"))
     (file-name (string-append name "-" version ".tar.gz"))))
   (build-system cmake-build-system)
   (arguments
    `(#:tests? #f)) ;; No tests available.
   (inputs `(("boost" ,boost)
             ("libiconv" ,libiconv)
             ("xz" ,xz)))
   (native-inputs `(("pkg-config" ,pkg-config)))
   (home-page "https://constexpr.org/innoextract/")
   (synopsis "Tool for extracting Inno Setup installers")
   (description "innoextract allows extracting Inno Setup installers under
non-Windows systems without running the actual installer using wine.")
   (license license:zlib)))

(define-public google-brotli
  (package
    (name "google-brotli")
    (version "1.0.4")
    (source (origin
             (method url-fetch)
             (uri (string-append "https://github.com/google/brotli/archive/v"
                                 version ".tar.gz"))
             (sha256
              (base32
               "1hrpmz162k4x3xm6vmbpm443jlfr1kp536p8962y2dncy7gs6s12"))))
    (build-system cmake-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'install 'rename-static-libraries
           ;; The build tools put a 'static' suffix on the static libraries, but
           ;; other applications don't know how to find these.
           (lambda* (#:key outputs #:allow-other-keys)
             (let ((lib (string-append (assoc-ref %outputs "out") "/lib/")))
               (rename-file (string-append lib "libbrotlicommon-static.a")
                            (string-append lib "libbrotlicommon.a"))
               (rename-file (string-append lib "libbrotlidec-static.a")
                            (string-append lib "libbrotlidec.a"))
               (rename-file (string-append lib "libbrotlienc-static.a")
                            (string-append lib "libbrotlienc.a"))
               #t))))
       #:configure-flags
       (list ;; Defaults to "lib64" on 64-bit archs.
             (string-append "-DCMAKE_INSTALL_LIBDIR="
                            (assoc-ref %outputs "out") "/lib"))))
    (home-page "https://github.com/google/brotli")
    (synopsis "General-purpose lossless compression")
    (description "This package provides the reference implementation of Brotli,
a generic-purpose lossless compression algorithm that compresses data using a
combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd
order context modeling, with a compression ratio comparable to the best
currently available general-purpose compression methods.  It is similar in speed
with @code{deflate} but offers more dense compression.

The specification of the Brotli Compressed Data Format is defined in RFC 7932.")
    (license license:expat)))

(define-public ucl
  (package
    (name "ucl")
    (version "1.03")
    (source (origin
             (method url-fetch)
             (uri (string-append "http://www.oberhumer.com/opensource/"
                                 name "/download/" name "-" version ".tar.gz"))
             (sha256
              (base32
               "0j036lkwsxvm15gr29n8wn07cqq79dswjs9k54939ms5zngjjrdq"))))
    (build-system gnu-build-system)
    (home-page "http://www.oberhumer.com/opensource/ucl/")
    (synopsis "Portable lossless data compression library")
    (description "UCL implements a number of compression algorithms that
achieve an excellent compression ratio while allowing fast decompression.
Decompression requires no additional memory.

Compared to LZO, the UCL algorithms achieve a better compression ratio but
decompression is a little bit slower.")
    (license license:gpl2+)))

(define-public upx
  (package
    (name "upx")
    (version "3.94")
    (source (origin
             (method url-fetch)
             (uri (string-append "https://github.com/upx/upx/releases/download/v"
                                 version "/" name "-" version "-src.tar.xz"))
             (sha256
              (base32
               "08anybdliqsbsl6x835iwzljahnm9i7v26icdjkcv33xmk6p5vw1"))
             (patches (search-patches "upx-fix-CVE-2017-15056.patch"))))
    (build-system gnu-build-system)
    (native-inputs `(("perl" ,perl)
                     ("ucl" ,ucl)))
    (inputs `(("zlib" ,zlib)))
    (arguments
     `(#:make-flags
       (list "all"
             ;; CHECK_WHITESPACE does not seem to work.
             ;; See https://git.archlinux.org/svntogit/community.git/tree/trunk/PKGBUILD?h=packages/upx.
             "CHECK_WHITESPACE=true")
       #:phases
       (modify-phases %standard-phases
         (delete 'configure)
         (delete 'check)
         (delete 'install)
         (add-before 'build 'patch-exec-bin-sh
           (lambda _
             (substitute* (find-files "Makefile")
               (("/bin/sh") (which "sh")))
             (substitute* "src/Makefile"
               (("/bin/sh") (which "sh")))
             #t))
         (add-after 'build 'install-upx
           (lambda* (#:key outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                   (bin (string-append out "/bin")))
               (mkdir-p bin)
               (copy-file "src/upx.out" (string-append bin "/upx")))
             #t))
         )))
    (home-page "https://upx.github.io/")
    ;; CVE-2017-16869 is about Mach-O files which is not of a big concern for Guix.
    ;; See https://github.com/upx/upx/issues/146 and
    ;; https://nvd.nist.gov/vuln/detail?vulnId=CVE-2017-16869.
    ;; The issue will be fixed after version 3.94.
    (properties `((lint-hidden-cve . ("CVE-2017-16869"))))
    (synopsis "Compression tool for executables")
    (description
     "The Ultimate Packer for eXecutables (UPX) is an executable file
compressor.  UPX typically reduces the file size of programs and shared
libraries by around 50%--70%, thus reducing disk space, network load times,
download times, and other distribution and storage costs.")
    (license license:gpl2+)))