lib/DBM/Deep/Engine/Sector/Null.pm

   1 package DBM::Deep::Engine::Sector::Null;
   2
   3 use 5.006_000;
   4
   5 use strict;
   6 use warnings FATAL => 'all';
   7
   8 use DBM::Deep::Engine::Sector::Data;
   9 our @ISA = qw( DBM::Deep::Engine::Sector::Data );
  10
  11 sub type { $_[0]{engine}->SIG_NULL }
  12 sub data_length { 0 }
  13 sub data { return }
  14
  15 sub _init {
  16     my $self = shift;
  17
  18     my $engine = $self->engine;
  19
  20     unless ( $self->offset ) {
  21         $self->{offset} = $engine->_request_data_sector( $self->size );
  22
  23         $self->write( 0, $self->type );
  24         $self->write( $self->base_size,
  25             pack( $engine->StP($engine->byte_size), 0 )   # Chain loc
  26           . pack( $engine->StP(1), $self->data_length ),  # Data length
  27         );
  28
  29         return;
  30     }
  31 }
  32
  33 1;
  34 __END__