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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_file_extension
!compression_get_cmdline_compress
!compression_get_cmdline_decompress
);
use Dpkg::IPC;
use Exporter qw(import);
our @EXPORT = (
@Dpkg::Compression::EXPORT,
qw(
compression_get_file_extension
compression_get_cmdline_compress
compression_get_cmdline_decompress
compression_guess_from_file
),
);
eval {
Dpkg::Compression->VERSION(2.01);
1;
} or do {
# Ensure we have the compression getters, regardless of the version of
# Dpkg::Compression to ease backporting.
*{'Dpkg::Compression::compression_get_file_extension'} = sub {
my $comp = shift;
return compression_get_property($comp, 'file_ext');
};
*{'Dpkg::Compression::compression_get_cmdline_compress'} = sub {
my $comp = shift;
my @prog = @{ compression_get_property($comp, 'comp_prog') };
push @prog, '-' . compression_get_property($comp, 'default_level');
return @prog;
};
*{'Dpkg::Compression::compression_get_cmdline_decompress'} = sub {
my $comp = shift;
my @prog = @{ compression_get_property($comp, 'decomp_prog') };
return @prog;
};
};
# 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_file_extension {
my $comp = shift;
if (!exists $comp_properties{$comp}) {
return Dpkg::Compression::compression_get_file_extension($comp);
}
return $comp_properties{$comp}{file_ext};
}
sub compression_get_cmdline_compress {
my $comp = shift;
if (!exists $comp_properties{$comp}) {
return Dpkg::Compression::compression_get_cmdline_compress($comp);
}
return @{ $comp_properties{$comp}{comp_prog} };
}
sub compression_get_cmdline_decompress {
my $comp = shift;
if (!exists $comp_properties{$comp}) {
return Dpkg::Compression::compression_get_cmdline_decompress($comp);
}
return @{ $comp_properties{$comp}{decomp_prog} };
}
1;
|
