Commit | Line | Data |
065b45be |
1 | #TODO: Convert this to a string |
2 | package DBM::Deep::Engine::Sector::Scalar; |
3 | |
4 | use 5.006; |
5 | |
6 | use strict; |
7 | use warnings FATAL => 'all'; |
8 | |
9 | our $VERSION = '0.01'; |
10 | |
11 | use DBM::Deep::Engine::Sector::Data; |
12 | our @ISA = qw( DBM::Deep::Engine::Sector::Data ); |
13 | |
14 | sub free { |
15 | my $self = shift; |
16 | |
17 | my $chain_loc = $self->chain_loc; |
18 | |
19 | $self->SUPER::free(); |
20 | |
21 | if ( $chain_loc ) { |
22 | $self->engine->_load_sector( $chain_loc )->free; |
23 | } |
24 | |
25 | return; |
26 | } |
27 | |
28 | sub type { $_[0]{engine}->SIG_DATA } |
29 | sub _init { |
30 | my $self = shift; |
31 | |
32 | my $engine = $self->engine; |
33 | |
34 | unless ( $self->offset ) { |
35 | my $data_section = $self->size - $self->base_size - $engine->byte_size - 1; |
36 | |
37 | $self->{offset} = $engine->_request_data_sector( $self->size ); |
38 | |
39 | my $data = delete $self->{data}; |
40 | my $dlen = length $data; |
41 | my $continue = 1; |
42 | my $curr_offset = $self->offset; |
43 | while ( $continue ) { |
44 | |
45 | my $next_offset = 0; |
46 | |
47 | my ($leftover, $this_len, $chunk); |
48 | if ( $dlen > $data_section ) { |
49 | $leftover = 0; |
50 | $this_len = $data_section; |
51 | $chunk = substr( $data, 0, $this_len ); |
52 | |
53 | $dlen -= $data_section; |
54 | $next_offset = $engine->_request_data_sector( $self->size ); |
55 | $data = substr( $data, $this_len ); |
56 | } |
57 | else { |
58 | $leftover = $data_section - $dlen; |
59 | $this_len = $dlen; |
60 | $chunk = $data; |
61 | |
62 | $continue = 0; |
63 | } |
64 | |
65 | $engine->storage->print_at( $curr_offset, $self->type ); # Sector type |
66 | # Skip staleness |
67 | $engine->storage->print_at( $curr_offset + $self->base_size, |
68 | pack( $engine->StP($engine->byte_size), $next_offset ), # Chain loc |
69 | pack( $engine->StP(1), $this_len ), # Data length |
70 | $chunk, # Data to be stored in this sector |
71 | chr(0) x $leftover, # Zero-fill the rest |
72 | ); |
73 | |
74 | $curr_offset = $next_offset; |
75 | } |
76 | |
77 | return; |
78 | } |
79 | } |
80 | |
81 | sub data_length { |
82 | my $self = shift; |
83 | |
84 | my $buffer = $self->engine->storage->read_at( |
85 | $self->offset + $self->base_size + $self->engine->byte_size, 1 |
86 | ); |
87 | |
88 | return unpack( $self->engine->StP(1), $buffer ); |
89 | } |
90 | |
91 | sub chain_loc { |
92 | my $self = shift; |
93 | return unpack( |
94 | $self->engine->StP($self->engine->byte_size), |
95 | $self->engine->storage->read_at( |
96 | $self->offset + $self->base_size, |
97 | $self->engine->byte_size, |
98 | ), |
99 | ); |
100 | } |
101 | |
102 | sub data { |
103 | my $self = shift; |
104 | # my ($args) = @_; |
105 | # $args ||= {}; |
106 | |
107 | my $data; |
108 | while ( 1 ) { |
109 | my $chain_loc = $self->chain_loc; |
110 | |
111 | $data .= $self->engine->storage->read_at( |
112 | $self->offset + $self->base_size + $self->engine->byte_size + 1, $self->data_length, |
113 | ); |
114 | |
115 | last unless $chain_loc; |
116 | |
117 | $self = $self->engine->_load_sector( $chain_loc ); |
118 | } |
119 | |
120 | return $data; |
121 | } |
122 | |
123 | 1; |
124 | __END__ |