Commit | Line | Data |
f0276afb |
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 base qw( DBM::Deep::Engine::Sector::Data ); |
9 | |
5ae752e2 |
10 | my $STALE_SIZE = 2; |
11 | |
12 | # Please refer to the pack() documentation for further information |
13 | my %StP = ( |
14 | 1 => 'C', # Unsigned char value (no order needed as it's just one byte) |
15 | 2 => 'n', # Unsigned short in "network" (big-endian) order |
16 | 4 => 'N', # Unsigned long in "network" (big-endian) order |
17 | 8 => 'Q', # Usigned quad (no order specified, presumably machine-dependent) |
18 | ); |
19 | |
f0276afb |
20 | sub type { $_[0]{engine}->SIG_NULL } |
21 | sub data_length { 0 } |
22 | sub data { return } |
23 | |
24 | sub _init { |
25 | my $self = shift; |
26 | |
27 | my $engine = $self->engine; |
28 | |
29 | unless ( $self->offset ) { |
30 | my $leftover = $self->size - $self->base_size - 1 * $engine->byte_size - 1; |
31 | |
32 | $self->{offset} = $engine->_request_data_sector( $self->size ); |
33 | $engine->storage->print_at( $self->offset, $self->type ); # Sector type |
34 | # Skip staleness counter |
35 | $engine->storage->print_at( $self->offset + $self->base_size, |
36 | pack( $StP{$engine->byte_size}, 0 ), # Chain loc |
37 | pack( $StP{1}, $self->data_length ), # Data length |
38 | chr(0) x $leftover, # Zero-fill the rest |
39 | ); |
40 | |
41 | return; |
42 | } |
43 | } |
44 | |
45 | 1; |
46 | __END__ |