File perl-Compression-Util.spec of Package perl-Compression-Util

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File perl-Compression-Util.spec of Package perl-Compression-Util

#
# spec file for package perl-Compression-Util
#
# Copyright (c) 2024 SUSE LLC
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
# upon. The license for this file, and modifications and additions to the
# file, is the same license as for the pristine package itself (unless the
# license for the pristine package is not an Open Source License, in which
# case the license is the MIT License). An "Open Source License" is a
# license that conforms to the Open Source Definition (Version 1.9)
# published by the Open Source Initiative.

# Please submit bugfixes or comments via https://bugs.opensuse.org/
#

%define cpan_name Compression-Util
Name:           perl-Compression-Util
Version:        0.08
Release:        0
License:        Artistic-2.0
Summary:        Implementation of various techniques used in data compression
URL:            https://metacpan.org/release/%{cpan_name}
Source0:        https://cpan.metacpan.org/authors/id/T/TR/TRIZEN/%{cpan_name}-%{version}.tar.gz
BuildArch:      noarch
BuildRequires:  perl
BuildRequires:  perl-macros
BuildRequires:  perl(List::Util) >= 1.45
BuildRequires:  perl(Module::Build)
Requires:       perl(List::Util) >= 1.45
%{perl_requires}

%description
*Compression::Util* is a function-based module, implementing various
techniques used in data compression, such as:

* Burrows-Wheeler transform
    * Move-to-front transform
    * Huffman Coding
    * Arithmetic Coding (in fixed bits)
    * Run-length encoding
    * Fibonacci coding
    * Elias gamma/omega coding
    * Delta coding
    * Bzip2-like compression
    * LZ77/LZSS compression
    * LZW compression

The provided techniques can be easily combined in various ways to create
powerful compressors, such as the Bzip2 compressor, which is a pipeline of
the following methods:

1. Run-length encoding (RLE4)
    2. Burrows-Wheeler transform (BWT)
    3. Move-to-front transform (MTF)
    4. Zero run-length encoding (ZRLE)
    5. Huffman coding

This functionality is provided by the function 'bwt_compress()', which can
be explicitly implemented as:

use 5.036;
    use Compression::Util qw(:all);

my $data = do { open my $fh, '<:raw', $^X; local $/; <$fh> };
    my $rle4 = rle4_encode(string2symbols($data));
    my ($bwt, $idx) = bwt_encode(symbols2string($rle4));

my ($mtf, $alphabet) = mtf_encode(string2symbols($bwt));
    my $rle = zrle_encode($mtf);

my $enc = pack('N', $idx)
            . encode_alphabet($alphabet)
            . create_huffman_entry($rle);

say "Original size  : ", length($data);
    say "Compressed size: ", length($enc);

# Decompress the result
    bwt_decompress($enc) eq $data or die "decompression error";

%prep
%autosetup  -n %{cpan_name}-%{version}

find . -type f ! -path "*/t/*" ! -name "*.pl" ! -path "*/bin/*" ! -path "*/script/*" ! -path "*/scripts/*" ! -name "configure" -print0 | xargs -0 chmod 644

%build
perl Build.PL --installdirs=vendor
./Build build --flags=%{?_smp_mflags}

%check
./Build test

%install
./Build install --destdir=%{buildroot} --create_packlist=0
%perl_gen_filelist

%files -f %{name}.files
%doc Changes examples README.md
%license LICENSE

%changelog

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File perl-Compression-Util.spec of Package perl-Compression-Util

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