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1 | #TODO: Add chaining back in. |
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2 | package DBM::Deep::Engine::Sector::Scalar; |
3 | |
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4 | use 5.006_000; |
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5 | |
6 | use strict; |
7 | use warnings FATAL => 'all'; |
8 | |
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9 | use DBM::Deep::Engine::Sector::Data; |
10 | our @ISA = qw( DBM::Deep::Engine::Sector::Data ); |
11 | |
12 | sub free { |
13 | my $self = shift; |
14 | |
15 | my $chain_loc = $self->chain_loc; |
16 | |
17 | $self->SUPER::free(); |
18 | |
19 | if ( $chain_loc ) { |
20 | $self->engine->_load_sector( $chain_loc )->free; |
21 | } |
22 | |
23 | return; |
24 | } |
25 | |
26 | sub type { $_[0]{engine}->SIG_DATA } |
27 | sub _init { |
28 | my $self = shift; |
29 | |
30 | my $engine = $self->engine; |
31 | |
32 | unless ( $self->offset ) { |
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33 | $self->{offset} = $engine->_request_data_sector( $self->size ); |
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34 | my $data = delete $self->{data}; |
35 | my $dlen = length $data; |
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36 | |
37 | my $data_section = $self->size - $self->base_size - $engine->byte_size - 1; |
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38 | my $next_offset = 0; |
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39 | |
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40 | if ( $dlen > $data_section ) { |
41 | DBM::Deep->_throw_error( "Storage of values longer than $data_section not supported." ); |
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42 | } |
43 | |
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44 | $self->write( 0, $self->type ); |
45 | $self->write( $self->base_size, |
46 | pack( $engine->StP($engine->byte_size), $next_offset ) # Chain loc |
47 | . pack( $engine->StP(1), $dlen ) # Data length |
48 | . $data |
49 | ); |
50 | |
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51 | return; |
52 | } |
53 | } |
54 | |
55 | sub data_length { |
56 | my $self = shift; |
57 | |
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58 | return unpack( |
59 | $self->engine->StP(1), |
60 | $self->read( $self->base_size + $self->engine->byte_size, 1 ), |
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61 | ); |
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62 | } |
63 | |
64 | sub chain_loc { |
65 | my $self = shift; |
66 | return unpack( |
67 | $self->engine->StP($self->engine->byte_size), |
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68 | $self->read( |
69 | $self->base_size, |
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70 | $self->engine->byte_size, |
71 | ), |
72 | ); |
73 | } |
74 | |
75 | sub data { |
76 | my $self = shift; |
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77 | |
78 | my $data; |
79 | while ( 1 ) { |
80 | my $chain_loc = $self->chain_loc; |
81 | |
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82 | $data .= $self->read( $self->base_size + $self->engine->byte_size + 1, $self->data_length ); |
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83 | |
84 | last unless $chain_loc; |
85 | |
86 | $self = $self->engine->_load_sector( $chain_loc ); |
87 | } |
88 | |
89 | return $data; |
90 | } |
91 | |
92 | 1; |
93 | __END__ |