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|
##- Nanar <nanardon@mandrake.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, 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.
##- $Id$
package Packdrakeng;
use strict;
use warnings;
use POSIX;
use File::Path;
use File::Temp qw(tempfile);
use Compress::Zlib;
use vars qw($VERSION);
my $debug = 1;
$VERSION = "0.10";
my ($toc_header, $toc_footer) =
('cz[0', '0]cz');
my $gzip_header = pack("C" . Compress::Zlib::MIN_HDR_SIZE,
Compress::Zlib::MAGIC1, Compress::Zlib::MAGIC2,
Compress::Zlib::Z_DEFLATED(), 0,0,0,0,0,0, Compress::Zlib::OSCODE);
my $gzip_header_len = length($gzip_header);
sub _new {
my ($class, %options) = @_;
my $pack = {
filename => $options{archive},
compress_method => $options{compress},
uncompress_method => $options{uncompress},
force_extern => $options{extern} || 0, # Don't use perl-zlib
use_extern => 1, # default behaviour, informative only
noargs => $options{noargs},
level => $options{comp_level} || 6, # compression level, aka -X gzip or bzip option
block_size => $options{block_size} || 400 * 1024, # A compressed block will contain 400k of compressed data
bufsize => $options{bufsize} || 65536, # Arbitrary buffer size to read files
# Internal data
handle => undef, # Archive handle
# Toc information
files => {}, # filename => { off, size, coff, csize }
dir => {}, # dir => no matter what value
'symlink' => {}, # file => link
coff => 0, # end of current compressed data
# Compression sub
subcompress => \&extern_compress,
subuncompress => \&extern_uncompress,
direct_write => 0, # Define if wrapper write directly in archive and not into temp file
# Data we need keep in memory to achieve the storage
current_block_files => {}, # Files in pending compressed block
current_block_csize => 0, # Actual size in pending compressed block
current_block_coff => 0, # The block block location (offset)
current_block_off => 0, # Actual uncompressed file offset within the pending block
cstream_data => undef, # Wrapper data we need to keep in memory (compression)
ustream_data => undef, # Wrapper data we need to keep in memory (uncompression)
# log and verbose function:
log => $options{quiet} ? sub {} : sub { my @w = @_; $w[0] .= "\n"; printf STDERR @w },
debug => $options{debug} ? sub { my @w =@_; $w[0] = "Debug: $w[0]\n"; printf STDERR @w } : sub {},
};
bless($pack, $class)
}
sub new {
my ($class, %options) = @_;
my $pack = _new($class, %options);
sysopen($pack->{handle}, $pack->{filename}, O_WRONLY | O_TRUNC | O_CREAT) or return undef;
$pack->choose_compression_method();
$pack->{need_build_toc} = 1;
$pack->{debug}->("Creating new archive with '%s' / '%s'%s.",
$pack->{compress_method}, $pack->{uncompress_method},
$pack->{use_extern} ? "" : " (internal compression)");
$pack
}
sub open {
my ($class, %options) = @_;
my $pack = _new($class, %options);
sysopen($pack->{handle}, $pack->{filename}, O_RDONLY) or return undef;
$pack->read_toc() or return undef;
$pack->{debug}->("Opening archive with '%s' / '%s'%s.",
$pack->{compress_method}, $pack->{uncompress_method},
$pack->{use_extern} ? "" : " (internal compression)");
$pack
}
# look $pack->{(un)compressed_method} and setup functions/commands to use
# Have some facility about detecting we want gzip/bzip
sub choose_compression_method {
my ($pack) = @_;
(!defined($pack->{compress_method}) && !defined($pack->{uncompress_method}))
and $pack->{compress_method} = "gzip";
my $test_method = $pack->{compress_method} || $pack->{uncompress_method};
$test_method =~ m/^bzip2|^bunzip2/ and do {
$pack->{compress_method} ||= "bzip2";
};
$test_method =~ m/^gzip|^gunzip/ and do {
$pack->{compress_method} ||= "gzip";
if (!$pack->{force_extern}) {
$pack->{subcompress} = \&gzip_compress;
$pack->{subuncompress} = \&gzip_uncompress;
$pack->{use_extern} = 0;
$pack->{direct_write} = 1;
}
};
if (!$pack->{noargs}) {
$pack->{uncompress_method} ||= "$pack->{compress_method} -d";
$pack->{compress_method} = $pack->{compress_method} ? "$pack->{compress_method} -$pack->{level}" : "";
}
}
sub DESTROY {
my ($pack) = @_;
$pack->build_toc();
close($pack->{handle}) if ($pack->{handle});
}
# Flush current compressed block
# Write
sub build_toc {
my ($pack) = @_;
$pack->{need_build_toc} or return 1;
$pack->end_block();
$pack->end_seek() or do {
warn "Can't seek into archive";
return 0;
};
my ($toc_length, $cf, $cd, $cl) = (0, 0, 0, 0);
foreach my $entry (keys %{$pack->{'dir'}}) {
$cd++;
my $w = syswrite($pack->{handle}, $entry . "\n") or do {
warn "Can't write toc into archive";
return 0;
};
$toc_length += $w;
}
foreach my $entry (keys %{$pack->{'symlink'}}) {
$cl++;
my $w = syswrite($pack->{handle}, sprintf("%s\n%s\n", $entry, $pack->{'symlink'}{$entry})) or do {
warn "Can't write toc into archive";
return 0;
};
$toc_length += $w
}
foreach my $entry (sort keys %{$pack->{files}}) {
$cf++;
my $w = syswrite($pack->{handle}, $entry ."\n") or do {
warn "Can't write toc into archive";
return 0;
};
$toc_length += $w;
}
foreach my $file (sort keys %{$pack->{files}}) {
my $entry = $pack->{files}{$file};
syswrite($pack->{handle}, pack('NNNN', $entry->{coff}, $entry->{csize}, $entry->{off}, $entry->{size})) or do {
warn "Can't write toc into archive";
return 0;
};
}
syswrite($pack->{handle}, pack("a4NNNNa40a4",
$toc_header,
$cd, $cl, $cf,
$toc_length,
$pack->{uncompress_method},
$toc_footer)) or do {
warn "Can't write toc into archive";
return 0;
};
1
}
sub read_toc {
my ($pack) = @_;
sysseek($pack->{handle}, -64, 2) ; #or return 0;
sysread($pack->{handle}, my $buf, 64);# == 64 or return 0;
my ($header, $toc_d_count, $toc_l_count, $toc_f_count, $toc_str_size, $uncompress, $trailer) =
unpack("a4NNNNZ40a4", $buf);
$header eq $toc_header && $trailer eq $toc_footer or do {
warn "Error reading toc: wrong header/trailer";
return 0;
};
$pack->{uncompress_method} ||= $uncompress;
$pack->choose_compression_method();
sysseek($pack->{handle}, -64 - ($toc_str_size + 16 * $toc_f_count) ,2);
sysread($pack->{handle}, my $fileslist, $toc_str_size);
my @filenames = split("\n", $fileslist);
sysread($pack->{handle}, my $sizes_offsets, 16 * $toc_f_count);
my @size_offset = unpack("N" . 4*$toc_f_count, $sizes_offsets);
foreach (1 .. $toc_d_count) {
$pack->{dir}{shift(@filenames)} = 1;
}
foreach (1 .. $toc_l_count) {
my $n = shift(@filenames);
$pack->{'symlink'}{$n} = shift(@filenames);
}
foreach (1 .. $toc_f_count) {
my $f = shift(@filenames);
$pack->{files}{$f}{coff} = shift(@size_offset);
$pack->{files}{$f}{csize} = shift(@size_offset);
$pack->{files}{$f}{off} = shift(@size_offset);
$pack->{files}{$f}{size} = shift(@size_offset);
# looking for offset for this archive
$pack->{files}{$f}{coff} + $pack->{files}{$f}{csize} > $pack->{coff} and
$pack->{coff} = $pack->{files}{$f}{coff} + $pack->{files}{$f}{csize};
}
1
}
# Goto to the end of written compressed data
sub end_seek {
my ($pack) = @_;
my $seekvalue = $pack->{direct_write} ? $pack->{coff} + $pack->{current_block_csize} : $pack->{coff};
sysseek($pack->{handle}, $seekvalue, 0) == $seekvalue
}
#- To terminate a compressed block, flush the pending compressed data,
#- fill toc data still unknown
sub end_block {
my ($pack) = @_;
$pack->end_seek() or return 0;
my $m = $pack->{subcompress};
my (undef, $csize) = $pack->$m(undef);
$pack->{current_block_csize} += $csize;
foreach (keys %{$pack->{current_block_files}}) {
$pack->{files}{$_} = $pack->{current_block_files}{$_};
$pack->{files}{$_}{csize} = $pack->{current_block_csize};
}
$pack->{coff} += $pack->{current_block_csize};
$pack->{current_block_coff} += $pack->{current_block_csize};
$pack->{current_block_csize} = 0;
$pack->{current_block_files} = {};
$pack->{current_block_off} = 0;
}
#######################
# Compression wrapper #
#######################
sub extern_compress {
my ($pack, $sourcefh) = @_;
my ($insize, $outsize, $filesize) = (0, 0, 0); # aka uncompressed / compressed data length
my $hout; # handle for gzip
if (defined($pack->{cstream_data})) {
$hout = $pack->{cstream_data}{hout};
$filesize = (stat($pack->{cstream_data}{file_block}))[7];
}
if (defined($sourcefh)) {
if (!defined($pack->{cstream_data})) {
my $hin;
($hin, $pack->{cstream_data}{file_block}) = tempfile();
close($hin); # ensure the flush
$pack->{cstream_data}{pid} = CORE::open($hout,
"|$pack->{compress_method} > $pack->{cstream_data}{file_block}") or do {
warn "Unable to start $pack->{compress_method}";
return 0, 0;
};
$pack->{cstream_data}{hout} = $hout;
binmode $hout;
}
# until we have data to push or data to read
while (my $length = sysread($sourcefh, my $data, $pack->{bufsize})) {
# pushing data to compressor
(my $l = syswrite($hout, $data)) == $length or do {
warn "can't push all data to compressor";
};
$insize += $l;
$outsize = (stat($pack->{cstream_data}{file_block}))[7];
}
} elsif (defined($pack->{cstream_data})) {
# If $sourcefh is not set, this mean we want a flush(), for end_block()
close($hout);
waitpid $pack->{cstream_data}{pid}, 0;
sysopen(my $hin, $pack->{cstream_data}{file_block}, O_RDONLY) or do {
warn "Can't open temp block file";
return 0, 0;
};
$outsize = (stat($pack->{cstream_data}{file_block}))[7];
unlink($pack->{cstream_data}{file_block});
while (my $lenght = sysread($hin, my $data, $pack->{bufsize})) {
(my $l = syswrite($pack->{handle}, $data)) == $lenght or do {
warn "Can't write all data in archive";
};
}
close($hin);
$pack->{cstream_data} = undef;
}
($insize, $outsize - $pack->{current_block_csize})
}
sub extern_uncompress {
my ($pack, $destfh, $fileinfo) = @_;
# We have to first extract the block to a temp file, burk !
my ($tempfh, $tempname) = tempfile();
my $cread = 0;
while ($cread < $fileinfo->{csize}) {
my $cl = sysread($pack->{handle}, my $data,
$cread + $pack->{bufsize} > $fileinfo->{csize} ?
$fileinfo->{csize} - $cread :
$pack->{bufsize}) or do {
warn("Enexpected end of file");
close($tempfh);
unlink($tempname);
return -1;
};
$cread += $cl;
syswrite($tempfh, $data) == length($data) or do {
warn "Can't write all data into temp file";
close($tempfh);
unlink($tempname);
return -1;
};
}
close($tempfh);
CORE::open(my $hc, "cat '$tempname' | $pack->{uncompress_method} |") or do {
warn "Can't start $pack->{uncompress_method} to uncompress data";
unlink($tempname);
return -1;
};
binmode($hc);
my $byteswritten = 0;
my $read = 0;
while ($byteswritten < $fileinfo->{size}) {
my $length = sysread($hc, my $data, $pack->{bufsize}) or do {
warn "unexpected end of stream $tempname";
#unlink($tempname);
close($hc);
return -1;
};
if ($read < $fileinfo->{off} && $read + $length > $fileinfo->{off}) {
$data = substr($data, $fileinfo->{off} - $read);
}
$read += $length;
if ($read <= $fileinfo->{off}) { next }
my $bw = $byteswritten + length($data) > $fileinfo->{size} ? $fileinfo->{size} - $byteswritten : length($data);
syswrite($destfh, $data, $bw) == $bw or do {
warn "Can't write data into dest";
return -1;
};
$byteswritten += $bw;
}
close($hc);
unlink($tempname); # deleting temp file
$byteswritten
}
sub gzip_compress {
my ($pack, $sourcefh) = @_;
my ($insize, $outsize) = (0, 0); # aka uncompressed / compressed data length
# If $sourcefh is not set, this mean we want a flush(), for end_block()
# EOF, flush compress stream, adding crc
if (!defined($sourcefh)) {
if (defined($pack->{cstream_data}{object})) {
my ($cbuf, $status) = $pack->{cstream_data}{object}->flush();
$outsize += syswrite($pack->{handle}, $cbuf);
$outsize += syswrite($pack->{handle}, pack("V V", $pack->{cstream_data}{crc}, $pack->{cstream_data}{object}->total_in()));
}
$pack->{cstream_data} = undef;
return(undef, $outsize);
}
if (!defined $pack->{cstream_data}{object}) {
# Writing gzip header file
$outsize += syswrite($pack->{handle}, $gzip_header);
$pack->{cstream_data}{object} = deflateInit(
-Level => $pack->{level},
# Zlib do not create gzip header, except with this flag
-WindowBits => - MAX_WBITS(),
);
}
binmode $sourcefh;
while (my $lenght = sysread($sourcefh, my $buf, $pack->{bufsize})) {
$pack->{cstream_data}{crc} = crc32($buf, $pack->{cstream_data}{crc});
my ($cbuf, $status) = $pack->{cstream_data}{object}->deflate($buf);
$outsize += syswrite($pack->{handle}, $cbuf);
$insize += $lenght;
}
($insize, $outsize)
}
sub gzip_uncompress {
my ($pack, $destfh, $fileinfo) = @_;
my $x = inflateInit(
-WindowBits => - MAX_WBITS(),
);
my $cread = 0; # Compressed data read
{
my $buf;
# get magic
if (sysread($pack->{handle}, $buf, 2) == 2) {
my @magic = unpack("C*", $buf);
$magic[0] == Compress::Zlib::MAGIC1 && $magic[1] == Compress::Zlib::MAGIC2 or do {
warn("Wrong magic header found");
return -1;
};
} else {
warn("Unexpect end of file while reading magic");
return -1;
}
my ($method, $flags);
if (sysread($pack->{handle}, $buf, 2) == 2) {
($method, $flags) = unpack("C2", $buf);
} else {
warn("Unexpect end of file while reading flags");
return -1;
}
if (sysread($pack->{handle}, $buf, 6) != 6) {
warn("Unexpect end of file while reading gzip header");
return -1;
}
$cread += 12; #Gzip header fixed size is already read
if ($flags & 0x04) {
if (sysread($pack->{handle}, $buf, 2) == 2) {
my $len = unpack("I", $buf);
$cread += $len;
if (sysread($pack->{handle}, $buf, $len) != $len) {
warn("Unexpect end of file while reading gzip header");
return -1;
}
} else {
warn("Unexpect end of file while reading gzip header");
return -1;
}
}
}
my $byteswritten = 0;
my $read = 0; # uncompressed data read
while ($byteswritten < $fileinfo->{size}) {
my $cl=sysread($pack->{handle}, my $buf,
$cread + $pack->{bufsize} > $fileinfo->{csize} ?
$fileinfo->{csize} - $cread :
$pack->{bufsize}) or do {
warn("Enexpected end of file");
return -1;
};
$cread += $cl;
my ($out, $status) = $x->inflate(\$buf);
$status == Z_OK || $status == Z_STREAM_END or do {
warn("Unable to uncompress data");
return -1;
};
my $l = length($out) or next;
if ($read < $fileinfo->{off} && $read + $l > $fileinfo->{off}) {
$out = substr($out, $fileinfo->{off} - $read);
}
$read += $l;
if ($read <= $fileinfo->{off}) { next }
my $bw = $byteswritten + length($out) > $fileinfo->{size} ? $fileinfo->{size} - $byteswritten : length($out);
syswrite($destfh, $out, $bw) == $bw or do {
warn "Can't write data into dest";
return -1;
};
$byteswritten += $bw;
}
$byteswritten
}
###################
# Debug functions #
###################
# This function extract in $dest the whole block containing $file, can be usefull for debugging
sub extract_block {
my ($pack, $dest, $file) = @_;
sysopen(my $handle, $dest, O_WRONLY | O_TRUNC | O_CREAT) or do {
warn "Can't open $dest";
return -1;
};
sysseek($pack->{handle}, $pack->{files}{$file}->{coff}, 0) == $pack->{files}{$file}->{coff} or do {
warn("Can't seek to offset $pack->{files}{$file}->{coff}");
close($handle);
return -1;
};
{
my $l;
$l = sysread($pack->{handle}, my $buf, $pack->{files}{$file}->{csize}) == $pack->{files}{$file}->{csize} or warn "Read only $l / $pack->{files}{$file}->{csize} bytes";
syswrite($handle, $buf);
}
foreach (sort {
$pack->{files}{$a}{coff} == $pack->{files}{$b}{coff} ?
$pack->{files}{$a}{off} <=> $pack->{files}{$b}{off} :
$pack->{files}{$a}{coff} <=> $pack->{files}{$b}{coff}
} keys %{$pack->{files}}) {
$pack->{files}{$_}{coff} == $pack->{files}{$file}->{coff} or next;
}
close($handle);
}
##################################
# Really working functions #
# Aka function people should use #
##################################
sub add_virtual {
my ($pack, $type, $filename, $data) = @_;
$type eq 'l' and do {
$pack->{'symlink'}{$filename} = $data;
$pack->{need_build_toc} = 1;
return 1;
};
$type eq 'd' and do {
$pack->{dir}{$filename}++;
$pack->{need_build_toc} = 1;
return 1;
};
$type eq 'f' and do {
# Be sure we are at the end, allow extract + add in only one instance
$pack->end_seek() or do {
warn("Can't seek to offset $pack->{coff}");
next;
};
my $m = $pack->{subcompress};
my ($size, $csize) = $pack->$m($data);
$pack->{current_block_files}{$filename} = {
size => $size,
off => $pack->{current_block_off},
coff => $pack->{current_block_coff},
csize => -1, # Still unknown, will be fill by end_block
}; # Storing in toc structure availlable info
# Updating internal info about current block
$pack->{current_block_off} += $size;
$pack->{current_block_csize} += $csize;
$pack->{need_build_toc} = 1;
if ($pack->{block_size} > 0 && $pack->{current_block_csize} >= $pack->{block_size}) {
$pack->end_block();
}
return 1;
};
0
}
sub add {
my ($pack, $prefix, @files) = @_;
$prefix ||= "";
foreach my $file (@files) {
$file =~ s://+:/:;
my $srcfile = $prefix ? "$prefix/$file" : $file;
$pack->{debug}->("Adding '%s' as '%s' into archive", $srcfile, $file);
-l $srcfile and do {
$pack->add_virtual('l', $file, readlink($srcfile));
next;
};
-d $srcfile and do { # dir simple case
$pack->add_virtual('d', $file);
next;
};
-f $srcfile and do {
sysopen(my $htocompress, $srcfile, O_RDONLY) or do {
warn "Can't add $srcfile: $!";
next;
};
$pack->add_virtual('f', $file, $htocompress);
close($htocompress);
next;
};
warn "Can't pack $srcfile";
}
1
}
sub extract_virtual {
my ($pack, $destfh, $filename) = @_;
defined($pack->{files}{$filename}) or return -1;
sysseek($pack->{handle}, $pack->{files}{$filename}->{coff}, 0) == $pack->{files}{$filename}->{coff} or do {
warn("Can't seek to offset $pack->{files}{$filename}->{coff}");
return -1;
};
my $m = $pack->{subuncompress};
$pack->$m($destfh, $pack->{files}{$filename});
}
sub extract {
my ($pack, $destdir, @file) = @_;
foreach my $f (@file) {
my $dest = $destdir ? "$destdir/$f" : "$f";
my ($dir) = $dest =~ m!(.*)/.*!;
if (exists($pack->{dir}{$f})) {
-d $dest || mkpath($dest)
or warn "Unable to create dir $dest: $!";
next;
} elsif (exists($pack->{'symlink'}{$f})) {
-d $dir || mkpath($dir) or
warn "Unable to create dir $dest: $!";
-l $dest and unlink $dest;
symlink($pack->{'symlink'}{$f}, $dest)
or warn "Unable to extract symlink $f: $!";
next;
} elsif (exists($pack->{files}{$f})) {
-d $dir || mkpath($dir) or do {
warn "Unable to create dir $dir";
};
if (-l $dest) {
unlink($dest) or do {
warn "Can't remove link $dest: $!";
next; # Don't overwrite a file because where the symlink point to
};
}
sysopen(my $destfh, $dest, O_CREAT | O_TRUNC | O_WRONLY)
or do {
warn "Unable to extract $dest";
next;
};
my $written = $pack->extract_virtual($destfh, $f);
$written == -1 and warn "Unable to extract file $f";
close($destfh);
next;
} else {
warn "Can't find $f in archive";
}
}
1
}
# Return \@dir, \@files, \@symlink list
sub getcontent {
my ($pack) = @_;
return([ keys(%{$pack->{dir}})], [ keys(%{$pack->{files}}) ], [ keys(%{$pack->{'symlink'}}) ]);
}
sub list {
my ($pack) = @_;
foreach my $file (keys %{$pack->{dir}}) {
printf "d %13c %s\n", ' ', $file;
}
foreach my $file (keys %{$pack->{'symlink'}}) {
printf "l %13c %s -> %s\n", ' ', $file, $pack->{'symlink'}{$file};
}
foreach my $file (sort {
$pack->{files}{$a}{coff} == $pack->{files}{$b}{coff} ?
$pack->{files}{$a}{off} <=> $pack->{files}{$b}{off} :
$pack->{files}{$a}{coff} <=> $pack->{files}{$b}{coff}
} keys %{$pack->{files}}) {
printf "f %12d %s\n", $pack->{files}{$file}{size}, $file;
}
}
# Print toc info
sub dumptoc {
my ($pack) = @_;
foreach my $file (keys %{$pack->{dir}}) {
printf "d %13c %s\n", ' ', $file;
}
foreach my $file (keys %{$pack->{'symlink'}}) {
printf "l %13c %s -> %s\n", ' ', $file, $pack->{'symlink'}{$file};
}
foreach my $file (sort {
$pack->{files}{$a}{coff} == $pack->{files}{$b}{coff} ?
$pack->{files}{$a}{off} <=> $pack->{files}{$b}{off} :
$pack->{files}{$a}{coff} <=> $pack->{files}{$b}{coff}
} keys %{$pack->{files}}) {
printf "f %d %d %d %d %s\n", $pack->{files}{$file}{size}, $pack->{files}{$file}{off}, $pack->{files}{$file}{csize}, $pack->{files}{$file}{coff}, $file;
}
}
1
__END__
=head1 NAME
Packdrakeng - Simple Archive Extractor/Builder
=head1 SYNOPSIS
use packdrakeng;
# creating an archive
$pack = packdrakeng->new(archive => "myarchive.cz");
# Adding few files
$pack->add("/path/", "file1", "file2");
# Adding an unamed file
open($handle, "file");
$pack->add_virtual("filename", $handle);
close($handle);
$pack = undef;
# extracting an archive
$pack = packdrakeng->open(archive => "myarchive.cz");
# listing files
$pack->list();
# extracting few files
$pack->extract("/path/", "file1", "file2");
# extracting data into a file handle
open($handle, "file");
$pack->extract_virtual($handle, "filename");
close($handle);
=head1 DESCRIPTION
C<Packdrakeng> is a simple indexed archive builder and extractor using
standard compression method.
This module is a rewrite from scratch of the original packdrake, his format is
fully compatible with old packdrake.
=head1 IMPLEMENTATION
Compressed data are stored by block:
UncompresseddatA1UncompresseddatA2 UncompresseddatA3UncompresseddatA4
|--- size 1 ---||--- size 2 ---| |--- size 3 ---||--- size 4 ---|
|<-offset1 |<-offset2 |<-offset3 |<-offset4
give:
CompresseD1CompresseD2 CompresseD3CompresseD4
|--- c. size 1, 2 ---| |--- c. size 3, 4 ---|
|<-c. offset 1, 2 |<-c. offset 3, 4
A new block is started when its size exceed the C<block_size> value.
Compressed data are followed by the toc, ie a simple list of packed files.
Each file name is terminated by the "\n" character:
dir1
dir2
...
dirN
symlink1
point_file1
symlink2
point_file2
...
...
symlinkN
point_fileN
file1
file2
...
fileN
Follow the files sizes, 4 values for each files are stored:
offset into archive of compressed block, size of compressed block,
offset into block of the file and the file's size.
Finally the archive contain a 64 bytes length trailer, about the
toc and the archive itself:
'cz[0', strings 4 bytes
number of directory, 4 bytes
number of symlinks, 4 bytes
number of files, 4 bytes
the toc size, 4 bytes
the uncompression command, string of 40 bytes length
'0]cz', string 4 bytes
=head1 FUNCTIONS
=over
=item B<new(%options)>
Create a new archive.
Options:
=over 4
=item archive
The file name of the archive. If the file doesn't exist, it will be created, else it will be owerwritten.
see C<open>.
=item compress
The application to use to compress, if unspecified, gzip is used.
=item uncompress
The application used to extract data from archive. This option is useless if
you're opening an existing archive (unless you want to force it).
If unset, this value is based on compress command followed by '-d' argument.
=item extern
If you're using gzip, by default packdrakeng will use perl-zlib to save system
ressources. This option force packdrakeng to use the external gzip command. This
has no meaning with other compress programs as internal functions are not implemented
yet.
=item comp_level
The compression level passed as an argument to the compression program. By default,
this is set to 6.
=item block_size
The limit size after which we start a new compressed block. The default value is
400KB. Set it to 0 to be sure a new block will be started for each packed
files, and -1 to never start a new block. Be aware a big size of block will slow
the file extraction.
=item quiet
Do not ouput anything, shut up.
=item debug
Print debug messages.
=back
=item B<open(%options)>
Open an existing archive for extracting or adding files.
The uncompression command is found into the archive, and the compression command is
deduced from it.
If you add files, a new compressed block will be started even if the
last block is smaller than C<block_size>. If some compression options can't be
found in the archive, the new preference will be applied.
Options are same than the C<new()> function.
=head1 AUTHOR
Olivier Thauvin <nanardon@mandrake.org>
=head1 LICENSE
This program is free software; you can redistribute it and/or
modify it under the terms of 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.
If you do not have a copy of the GNU General Public License write to
the Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
MA 02139, USA.
=cut
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