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# Copyright © 2008 Raphaël Hertzog <hertzog@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 <http://www.gnu.org/licenses/>.
package Dpkg::Compression::CompressedFile;
use strict;
use warnings;
use Dpkg::Compression;
use Dpkg::Compression::Compressor;
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use POSIX;
# Object methods
sub new {
my ($this, %args) = @_;
my $class = ref($this) || $this;
my $self = {
"compression" => "auto"
};
bless $self, $class;
$self->{"compressor"} = Dpkg::Compression::Compressor->new();
$self->{"add_comp_ext"} = $args{"add_compression_extension"} ||
$args{"add_comp_ext"} || 0;
$self->{"allow_sigpipe"} = 0;
if (exists $args{"filename"}) {
$self->set_filename($args{"filename"});
}
if (exists $args{"compression"}) {
$self->set_compression($args{"compression"});
}
if (exists $args{"compression_level"}) {
$self->set_compression_level($args{"compression_level"});
}
return $self;
}
sub reset {
my ($self) = @_;
%{$self} = ();
}
sub set_compression {
my ($self, $method) = @_;
if ($method ne "none" and $method ne "auto") {
$self->{"compressor"}->set_compression($method);
}
$self->{"compression"} = $method;
}
sub set_compression_level {
my ($self, $level) = @_;
$self->{"compressor"}->set_compression_level($level);
}
sub set_filename {
my ($self, $filename, $add_comp_ext) = @_;
$self->{"filename"} = $filename;
# Automatically add compression extension to filename
if (defined($add_comp_ext)) {
$self->{"add_comp_ext"} = $add_comp_ext;
}
if ($self->{"add_comp_ext"} and $filename =~ /\.$comp_regex$/) {
warning("filename %s already has an extension of a compressed file " .
"and add_comp_ext is active", $filename);
}
}
sub get_filename {
my $self = shift;
my $comp = $self->{"compression"};
if ($self->{'add_comp_ext'}) {
if ($comp eq "auto") {
internerr("automatic detection of compression is " .
"incompatible with add_comp_ext");
} elsif ($comp eq "none") {
return $self->{"filename"};
} else {
return $self->{"filename"} . "." . $comp_ext{$comp};
}
} else {
return $self->{"filename"};
}
}
sub use_compression {
my ($self, $update) = @_;
my $comp = $self->{"compression"};
if ($comp eq "none") {
return 0;
} elsif ($comp eq "auto") {
$comp = get_compression_from_filename($self->get_filename());
$self->{"compressor"}->set_compression($comp) if $comp;
}
return $comp;
}
sub open_for_write {
my ($self) = @_;
my $handle;
if ($self->use_compression()) {
$self->{'compressor'}->compress(from_pipe => \$handle,
to_file => $self->get_filename());
} else {
open($handle, '>', $self->get_filename()) ||
syserr(_g("cannot write %s"), $self->get_filename());
}
return $handle;
}
sub open_for_read {
my ($self) = @_;
my $handle;
if ($self->use_compression()) {
$self->{'compressor'}->uncompress(to_pipe => \$handle,
from_file => $self->get_filename());
$self->{'allow_sigpipe'} = 1;
} else {
open($handle, '<', $self->get_filename()) ||
syserr(_g("cannot read %s"), $self->get_filename());
}
return $handle;
}
sub cleanup_after_open {
my ($self) = @_;
my $cmdline = $self->{"compressor"}{"cmdline"} || "";
$self->{"compressor"}->wait_end_process(nocheck => $self->{'allow_sigpipe'});
if ($self->{'allow_sigpipe'}) {
unless (($? == 0) || (WIFSIGNALED($?) && (WTERMSIG($?) == SIGPIPE))) {
subprocerr($cmdline);
}
}
}
1;
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