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package Filter::Decompress ;
# For usage see examples/filtdef

use Filter::Util::Call ;
use Compress::Zlib ;
use Carp ;

use strict ;
use warnings ;

our $VERSION = '1.02' ;

sub filter 
{ 
    my ($self) = @_ ;
    my ($status, $err) ;
    my ($inf) = $$self ;

    if (($status = filter_read()) >0) {
        ($_, $err) = $inf->inflate($_) ;
        return -1 unless $err == Z_OK or $err == Z_STREAM_END ;
    }
    $status ;
}

sub import
{
    my ($self) = @_ ;

    # Initialise an inflation stream.
    my $x = inflateInit()
        or croak "Internal Error inflateInit" ;
    filter_add(\$x) ;
}

1 ;
__END__