Commit | Line | Data |
f0276afb |
1 | package DBM::Deep::Engine::Sector::Scalar; |
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 | |
10 | sub free { |
11 | my $self = shift; |
12 | |
13 | my $chain_loc = $self->chain_loc; |
14 | |
15 | $self->SUPER::free(); |
16 | |
17 | if ( $chain_loc ) { |
18 | $self->engine->_load_sector( $chain_loc )->free; |
19 | } |
20 | |
21 | return; |
22 | } |
23 | |
24 | sub type { $_[0]{engine}->SIG_DATA } |
25 | sub _init { |
26 | my $self = shift; |
27 | |
28 | my $engine = $self->engine; |
29 | |
30 | unless ( $self->offset ) { |
31 | my $data_section = $self->size - $self->base_size - $engine->byte_size - 1; |
32 | |
33 | $self->{offset} = $engine->_request_data_sector( $self->size ); |
34 | |
35 | my $data = delete $self->{data}; |
36 | my $dlen = length $data; |
37 | my $continue = 1; |
38 | my $curr_offset = $self->offset; |
39 | while ( $continue ) { |
40 | |
41 | my $next_offset = 0; |
42 | |
43 | my ($leftover, $this_len, $chunk); |
44 | if ( $dlen > $data_section ) { |
45 | $leftover = 0; |
46 | $this_len = $data_section; |
47 | $chunk = substr( $data, 0, $this_len ); |
48 | |
49 | $dlen -= $data_section; |
50 | $next_offset = $engine->_request_data_sector( $self->size ); |
51 | $data = substr( $data, $this_len ); |
52 | } |
53 | else { |
54 | $leftover = $data_section - $dlen; |
55 | $this_len = $dlen; |
56 | $chunk = $data; |
57 | |
58 | $continue = 0; |
59 | } |
60 | |
61 | $engine->storage->print_at( $curr_offset, $self->type ); # Sector type |
62 | # Skip staleness |
63 | $engine->storage->print_at( $curr_offset + $self->base_size, |
64 | pack( $StP{$engine->byte_size}, $next_offset ), # Chain loc |
65 | pack( $StP{1}, $this_len ), # Data length |
66 | $chunk, # Data to be stored in this sector |
67 | chr(0) x $leftover, # Zero-fill the rest |
68 | ); |
69 | |
70 | $curr_offset = $next_offset; |
71 | } |
72 | |
73 | return; |
74 | } |
75 | } |
76 | |
77 | sub data_length { |
78 | my $self = shift; |
79 | |
80 | my $buffer = $self->engine->storage->read_at( |
81 | $self->offset + $self->base_size + $self->engine->byte_size, 1 |
82 | ); |
83 | |
84 | return unpack( $StP{1}, $buffer ); |
85 | } |
86 | |
87 | sub chain_loc { |
88 | my $self = shift; |
89 | return unpack( |
90 | $StP{$self->engine->byte_size}, |
91 | $self->engine->storage->read_at( |
92 | $self->offset + $self->base_size, |
93 | $self->engine->byte_size, |
94 | ), |
95 | ); |
96 | } |
97 | |
98 | sub data { |
99 | my $self = shift; |
100 | # my ($args) = @_; |
101 | # $args ||= {}; |
102 | |
103 | my $data; |
104 | while ( 1 ) { |
105 | my $chain_loc = $self->chain_loc; |
106 | |
107 | $data .= $self->engine->storage->read_at( |
108 | $self->offset + $self->base_size + $self->engine->byte_size + 1, $self->data_length, |
109 | ); |
110 | |
111 | last unless $chain_loc; |
112 | |
113 | $self = $self->engine->_load_sector( $chain_loc ); |
114 | } |
115 | |
116 | return $data; |
117 | } |
118 | |
119 | 1; |
120 | __END__ |