File Coverage

blib/lib/Compress/unLZMA.pm

Criterion	Covered	Total	%
statement	22	26	84.6
branch	6	8	75.0
condition			n/a
subroutine	3	5	60.0
pod	1	3	33.3
total	32	42	76.1

package Compress::unLZMA;

use strict;
use warnings;

require Exporter;

our @ISA = qw(Exporter);

our %EXPORT_TAGS = ( 'all' => [ qw(
	uncompress uncompressfile
) ] );

our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );

our $VERSION = '0.05';

require XSLoader;
XSLoader::load('Compress::unLZMA', $VERSION);

sub compress {
	die "not implemented!\n";
}

sub compressfile {
	die "not implemented!\n";
}

sub uncompress {
	my ($data) = @_;

	return undef if (length($data) < 14);

	my $properties = substr($data, 0, 5);

	my $size = 0;
	for (my $ii = 0; $ii < 4; $ii++) {
		my $b = ord(substr($data, $ii + 5, 1));
		$size += $b << ($ii * 8);
	}

	for (my $ii = 0; $ii < 4; $ii++) {
		my $b = ord(substr($data, $ii + 9, 1));
		if ($b != 0) {
			return undef;
		}
	}

	if (ord(substr($properties, 0, 1)) >= (9 * 5 * 5)) {
		return undef;
	}

	if ( $size == 0 ) { # empty file: no data to uncompress
		return '';
	}

	$data = substr($data, 13);

	my $result = uncompressdata($data, length($data), $size, $properties);

	return $result;
}

1;

__END__