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package MaxMind::DB::Reader::Role::NodeReader;
use strict;
use warnings;
use namespace::autoclean;
use autodie;
our $VERSION = '1.000014';
use MaxMind::DB::Types qw( Int );
use Moo::Role;
with 'MaxMind::DB::Reader::Role::HasMetadata';
has _node_byte_size => (
is => 'ro',
isa => Int,
init_arg => undef,
lazy => 1,
builder => '_build_node_byte_size',
);
has _search_tree_size => (
is => 'ro',
isa => Int,
init_arg => undef,
lazy => 1,
builder => '_build_search_tree_size',
);
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _read_node {
my $self = shift;
my $node_num = shift;
my $node = q{};
$self->_read(
\$node,
$node_num * $self->_node_byte_size,
$self->_node_byte_size,
);
return $self->_split_node_into_records($node);
}
sub _split_node_into_records {
my $self = shift;
my $node = shift;
if ( $self->record_size == 24 ) {
return unpack( NN => pack( 'xa*xa*' => unpack( a3a3 => $node ) ) );
}
elsif ( $self->record_size == 28 ) {
my ( $left_bytes, $middle_byte, $right_bytes )
= unpack( a3Ca3 => $node );
return (
unpack(
N => pack( 'Ca*', ( $middle_byte & 0xf0 ) >> 4, $left_bytes )
),
unpack(
N => pack( 'Ca*', ( $middle_byte & 0x0f ), $right_bytes )
)
);
}
elsif ( $self->record_size == 32 ) {
return unpack( NN => $node );
}
}
sub _build_node_byte_size {
my $self = shift;
return $self->record_size * 2 / 8;
}
sub _build_search_tree_size {
my $self = shift;
return $self->node_count * $self->_node_byte_size;
}
1;
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