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# Copyright James McCoy <jamessan@debian.org> 2013.
# Modifications copyright 2002 Julian Gilbey <jdg@debian.org>
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
package Devscripts::Compression;
use Dpkg::Compression qw(!compression_get_property);
use Dpkg::IPC;
use Exporter qw(import);
our @EXPORT = (
@Dpkg::Compression::EXPORT,
qw(compression_get_file_extension_regex compression_guess_from_file),
);
eval {
Dpkg::Compression->VERSION(1.02);
1;
} or do {
# Ensure we have compression_get_file_extension_regex, regardless of the
# version of Dpkg::Compression to ease backporting.
*{'Devscripts::Compression::compression_get_file_extension_regex'} = sub {
return $compression_re_file_ext;
};
};
# This can potentially be moved to Dpkg::Compression
my %mime2comp = (
"application/x-gzip" => "gzip",
"application/gzip" => "gzip",
"application/x-bzip2" => "bzip2",
"application/bzip2 " => "bzip2",
"application/x-xz" => "xz",
"application/xz" => "xz",
"application/zip" => "zip",
"application/x-compress" => "compress",
"application/java-archive" => "zip",
"application/x-tar" => "tar",
"application/zstd" => "zst",
"application/x-zstd" => "zst",
);
sub compression_guess_from_file {
my $filename = shift;
my $mimetype;
spawn(
exec => ['file', '--dereference', '--brief', '--mime-type', $filename],
to_string => \$mimetype,
wait_child => 1
);
chomp($mimetype);
if (exists $mime2comp{$mimetype}) {
return $mime2comp{$mimetype};
} else {
return;
}
}
# comp_prog and default_level aren't provided because a) they aren't needed in
# devscripts and b) the Dpkg::Compression API isn't rich enough to support
# these as compressors
my %comp_properties = (
compress => {
file_ext => 'Z',
decomp_prog => ['uncompress'],
},
zip => {
file_ext => 'zip',
decomp_prog => ['unzip'],
},
zst => {
file_ext => 'zst',
#comp_prog => ['zstd'],
decomp_prog => ['unzstd'],
default_level => 3,
});
sub compression_get_property {
my ($compression, $property) = @_;
if (!exists $comp_properties{$compression}) {
return Dpkg::Compression::compression_get_property($compression,
$property);
}
if (exists $comp_properties{$compression}{$property}) {
return $comp_properties{$compression}{$property};
}
return;
}
1;
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