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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.
##- $Id$
##- This package provide functions to use Zlib::Compress instead gzip.
package Packdrakeng::zlib;
use strict;
use warnings;
use Compress::Zlib;
my $gzip_header = pack("C" . Compress::Zlib::MIN_HDR_SIZE,
Compress::Zlib::MAGIC1, Compress::Zlib::MAGIC2,
Compress::Zlib::Z_DEFLATED(), 0,0,0,0,0,0, Compress::Zlib::OSCODE);
sub gzip_compress {
my ($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);
my $wres = syswrite($pack->{handle}, $cbuf) || 0;
$wres == length($cbuf) or do {
warn "can't push all data to compressor";
return 0, 0;
};
$outsize += $wres;
$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
}
1;
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