view release on metacpan or  search on metacpan

lib/Aard.pm  view on Meta::CPAN

package Aard;

use 5.014000;
use strict;
use warnings;
our $VERSION = '0.001';

use IO::Uncompress::Inflate qw/inflate/;
use IO::Uncompress::Bunzip2 qw/bunzip2/;
use List::Util qw/sum/;

use JSON::MaybeXS qw/decode_json/;
use UUID::Tiny qw/uuid_to_string/;

use constant HEADER_SPEC => [
	[signature             => 'Z4' , 4 ],
	[sha1sum               => 'Z40', 40],
	[version               => 'S>' , 2 ],
	[uuid                  => 'Z16', 16],
	[volume                => 'S>' , 2 ],
	[total_volumes         => 'S>' , 2 ],
	[meta_length           => 'L>' , 4 ],
	[index_count           => 'L>' , 4 ],
	[article_offset        => 'L>' , 4 ],
	[index1_item_format    => 'Z4' , 4 ],
	[key_length_format     => 'Z2' , 2 ],
	[article_length_format => 'Z2' , 2 ],
];

my $header_length = sum map { $_->[2] } @{HEADER_SPEC()};

sub decompress {
	my ($input) = @_;
	my $output = $input;
	inflate \$input => \$output;
	bunzip2 \$input => \$output if $input =~ /^BZ/;
	$output
}

sub read_at {
	my ($self, $offset, $length) = @_;
	my $fh = $self->{fh};
	my $part;
	seek $fh, $offset, 0;
	read $fh, $part, $length;
	$part
}

sub index1 {
	my ($self, $index) = @_;
	unless (exists $self->{index1}{$index}) {
		my $part = $self->read_at($self->{index1_offset} + $index * $self->{index_length}, $self->{index_length});
		$self->{index1}{$index} = [unpack $self->{index_format}, $part]
	}
	$self->{index1}{$index}
}

sub fh            { shift->{fh} }
sub sha1sum       { shift->{sha1sum} }
sub uuid          { shift->{uuid} }
sub uuid_string   { uuid_to_string shift->uuid }
sub volume        { shift->{volume} }
sub total_volumes { shift->{total_volumes} }
sub count         { shift->{index_count} }

sub meta                          { shift->{meta} }
sub article_count                 { shift->meta->{article_count} }
sub article_count_is_volume_total { shift->meta->{article_count_is_volume_total} }
sub index_language                { shift->meta->{index_language} }
sub article_language              { shift->meta->{article_language} }
sub title                         { shift->meta->{title} }
sub version                       { shift->meta->{version} }