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#!/usr/bin/perl
#- Mandrake Simple Archive Builder.
#- Copyright (C) 1999 MandrakeSoft (fpons@mandrakesoft.com)
#-
#- 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, 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, write to the Free Software
#- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#- Simple cat archive with bzip2 for perl.
#- read file list and produce an $ARGV[0].cz2 archive file.
#- uncompressing sheme is:
#- | |
#- | | | |
#- $off1 =|*| } | |
#- |*| } $off2 =|+| }
#- |*| } $siz1 => 'bzip2 -d' => |+| } $siz2 => $filename
#- |*| } |+| }
#- |*| } | |
#- | | | |
#- | | | |
#- | |
#- where %data has the following format:
#- { 'filename' => [ 'f', $off1, $siz1, $off2, $siz2 ] }
#- except for symbolink link where it is:
#- { 'filename_symlink' => [ 'l', $symlink_value ] }
#- and directory where it is only
#- { 'filename_directory' => [ 'd' ] }
#- as you can see, there is no owner, group, filemode... an extension could be
#- made with 'F' (instead of 'f'), 'L' instead of 'l' for exemple.
#- we do not need them as it is used for DrakX for fast archive extraction and
#- owner/filemode is for user running only (ie root).
#-
#- archive file contains concatenation of all bzip2'ed group of files whose
#- filenames are on input,
#- then a TOC (describing %data, concatenation of toc_line) follow and a
#- TOC_TRAILER for summary.
#+use strict qw(subs vars refs);
#- tempory file used for building.
my $tmpdir = $ENV{TMPDIR} || "/tmp";
my $tmpz = "$tmpdir/tmp.z.$$";
sub toc_line {
my ($file, $data) = @_;
for ($data->[0]) {
return(/l/ && pack("anna*", 'l', length($file), length($data->[1]), "$file$data->[1]") ||
/d/ && pack("ana*", 'd', length($file), $file) ||
/f/ && pack("anNNNNa*", 'f', length($file), $data->[1], $data->[2], $data->[3], $data->[4], $file) ||
die "unknown extension $_\n");
}
}
sub cat_compress {
my ($compress, @filenames) = @_;
local *F;
open F, "| $compress >$tmpz" or die "cannot start \"$compress\"\n";
foreach (@filenames) {
my ($buf, $siz, $sz);
local *FILE;
open FILE, $_ or die "cannot open $_: $!\n";
$siz = -s $_;
while (($sz = sysread(FILE, $buf, $siz > 16384 ? 16384 : $siz))) {
$siz -= $sz;
syswrite(F, $buf);
last unless $siz > 0;
}
close FILE;
}
close F;
-s $tmpz;
}
sub main {
my ($archivename, $maxsiz) = @_;
my ($compress, $uncompress, $off1, $siz1, $off2, $siz2) = ('', '', 0, 0, 0, 0);
my @filelist = ();
my @data = ();
my %data = ();
die "usage: $0 <archivename> <maxsiz>\n" unless $maxsiz >= 100000;
#- guess compress method to use.
if ($archivename =~ /\.cz$/) {
($compress, $uncompress) = ("gzip -9", "gzip -d");
} elsif ($archivename =~ /\.cz2$/) {
($compress, $uncompress) = ("bzip2 -9", "bzip2 -d");
} else {
die "how to choose a compression which such a filename $archivename\n";
}
print STDERR "choosing compression method with \"$compress\" for archive $archivename\n";
unlink "$archivename";
unlink $tmpz;
foreach (<STDIN>) {
chomp;
my $file = $_; -e $file or die "unable to find file $file\n";
push @data, $file;
#- now symbolic link and directory are supported, extension is
#- available with the first field of $data{$file}.
if (-l $file) {
$data{$file} = [ 'l', readlink $file ];
} elsif (-d $file) {
$data{$file} = [ 'd' ];
} else {
$siz2 = -s $file;
push @filelist, $file;
$data{$file} = [ 'f', -1, -1, $off2, $siz2 ];
if ($off2 + $siz2 > $maxsiz) { #- need compression.
$siz1 = cat_compress($compress, @filelist);
foreach (@filelist) { $data{$_} = [ 'f', $off1, $siz1, $data{$_}[3], $data{$_}[4] ] }
system "cat $tmpz >>$archivename";
$off1 += $siz1;
$off2 = 0; $siz2 = 0;
@filelist = ();
}
$off2 += $siz2;
}
}
if (scalar @filelist) {
$siz1 = cat_compress($compress, @filelist);
foreach (@filelist) { $data{$_} = [ 'f', $off1, $siz1, $data{$_}[3], $data{$_}[4] ] }
system "cat $tmpz >>$archivename";
$off1 += $siz1;
print STDERR "real archive size of $archivename is $off1\n";
}
#- produce a TOC directly at the end of the file, follow with
#- a trailer with TOC summary and archive summary.
local *OUTPUT;
open OUTPUT, ">>$archivename";
my ($toc_str, $toc_data) = ('', '');
my @data_d = ();
my @data_l = ();
my @data_f = ();
foreach (@data) {
my $file = $_;
$data{$file} or die "build_archive: internal error on $_\n";
#- specific according to type.
#- with this version, only f has specific data other than strings.
for ($data{$file}[0]) {
/d/ && do { push @data_d, $file; last; };
/l/ && do { push @data_l, $file; last; };
/f/ && do { push @data_f, $file; $toc_data .= pack("NNNN",
$data{$file}[1],
$data{$file}[2],
$data{$file}[3],
$data{$file}[4]); last; };
die "unknown extension $_\n";
}
}
foreach (@data_d) { $toc_str .= $_ . "\n" }
foreach (@data_l) { $toc_str .= $_ . "\n" . $data{$_}[1] . "\n" }
foreach (@data_f) { $toc_str .= $_ . "\n" }
print OUTPUT $toc_str;
print OUTPUT $toc_data;
print OUTPUT toc_trailer(scalar(@data_d), scalar(@data_l), scalar(@data_f),
length($toc_str), $uncompress);
close OUTPUT;
}
sub toc_trailer {
my ($toc_d_count, $toc_l_count, $toc_f_count, $toc_str_size, $uncompress) = @_;
#- 'cz[0' is toc_trailer header where 0 is version information, only 0 now.
#- '0]cz' is toc_trailer trailer that match the corresponding header for information.
return pack "a4NNNNa40a4", 'cz[0', $toc_d_count, $toc_l_count, $toc_f_count, $toc_str_size, $uncompress, '0]cz';
}
main(@ARGV);
unlink $tmpz;
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