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package DebPool::Gzip;
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###
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#
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# DebPool::Gzip - Module for handling Gzip interactions
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#
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# Copyright 2003-2004 Joel Aelwyn. All rights reserved.
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# 
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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#    notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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#    notice, this list of conditions and the following disclaimer in the
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#    documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the Author nor the names of any contributors
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#    may be used to endorse or promote products derived from this software
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#    without specific prior written permission.
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# 
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $Id: Gzip.pm 27 2004-11-07 03:06:59Z joel $
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#
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###
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# We use 'our', so we must have at least Perl 5.6
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require 5.006_000;
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# Always good ideas.
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use strict;
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use warnings;
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use POSIX; # WEXITSTATUS
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use File::Temp qw(tempfile);
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# Needed for open2()
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use Fcntl;
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use IPC::Open2;
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### Module setup
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BEGIN {
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    use Exporter ();
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    our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
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    # Version checking
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    $VERSION = '0.1.5';
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    @ISA = qw(Exporter);
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    @EXPORT = qw(
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    );
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    @EXPORT_OK = qw(
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        &Gzip_File
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    );
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    %EXPORT_TAGS = (
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        'functions' => [qw(&Gzip_File)],
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        'vars' => [qw()],
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    );
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}
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### Exported package globals
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### Non-exported package globals
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# Thread-safe? What's that? Package global error value. We don't export
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# this directly, because it would conflict with other modules.
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our($Error);
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### File lexicals
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# None
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### Constant functions
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# None
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### Meaningful functions
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# Gzip_File($file)
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#
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# Generates a gzipped version of $file, and returns the filename. Returns
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# undef (and sets $Error) on failure.
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sub Gzip_File {
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    use DebPool::Logging qw(:functions :facility :level);
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    my($file) = @_;
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    # Open a secure tempfile to write the compressed data into
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    my($tmpfile_handle, $tmpfile_name) = tempfile();
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    # Open the source file so that we have it available.
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    if (!open(SOURCE, '<', $file)) {
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        $Error = "Couldn't open source file '$file': $!";
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        return undef;
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    }
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    # We are go for main engine start
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    my(@args) = ('--best', '--force', '--stdout');
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    my($gzip_pid) = open2(*GZIP_IN, *GZIP_OUT, '/bin/gzip', @args);
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    my($child_pid);
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    if ($child_pid = fork) { # In the parent
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        # Send all the data to Gzip;
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        close(GZIP_IN);
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        close($tmpfile_handle);
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        print GZIP_OUT <SOURCE>;
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        close(GZIP_OUT);
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        close(SOURCE);
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        waitpid($child_pid, 0);
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    } else { # In the child - we hope
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        if (!defined($child_pid)) {
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            die "Couldn't fork: $!\n";
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        }
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        # Read back the results, and print them into the tempfile.
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        close(GZIP_OUT);
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        close(SOURCE);
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        print $tmpfile_handle <GZIP_IN>;
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        close(GZIP_IN);
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        close($tmpfile_handle);
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        exit(0);
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    }
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    # And we're done
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    return $tmpfile_name;
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}
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END {}
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1;
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__END__
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# vim:set tabstop=4 expandtab: