1 package DBM::Deep::Sector::File::Scalar;
6 use warnings FATAL => 'all';
7 no warnings 'recursion';
9 use base qw( DBM::Deep::Sector::File::Data );
13 # Please refer to the pack() documentation for further information
15 1 => 'C', # Unsigned char value (no order needed as it's just one byte)
16 2 => 'n', # Unsigned short in "network" (big-endian) order
17 4 => 'N', # Unsigned long in "network" (big-endian) order
18 8 => 'Q', # Usigned quad (no order specified, presumably machine-dependent)
24 my $chain_loc = $self->chain_loc;
29 $self->engine->load_sector( $chain_loc )->free;
35 sub type { $_[0]{engine}->SIG_DATA }
39 my $engine = $self->engine;
41 unless ( $self->offset ) {
42 my $data_section = $self->size - $self->base_size - $engine->byte_size - 1;
44 $self->{offset} = $engine->_request_data_sector( $self->size );
46 my $data = delete $self->{data};
47 my $dlen = length $data;
49 my $curr_offset = $self->offset;
54 my ($leftover, $this_len, $chunk);
55 if ( $dlen > $data_section ) {
57 $this_len = $data_section;
58 $chunk = substr( $data, 0, $this_len );
60 $dlen -= $data_section;
61 $next_offset = $engine->_request_data_sector( $self->size );
62 $data = substr( $data, $this_len );
65 $leftover = $data_section - $dlen;
72 $engine->storage->print_at( $curr_offset, $self->type ); # Sector type
74 $engine->storage->print_at( $curr_offset + $self->base_size,
75 pack( $StP{$engine->byte_size}, $next_offset ), # Chain loc
76 pack( $StP{1}, $this_len ), # Data length
77 $chunk, # Data to be stored in this sector
78 chr(0) x $leftover, # Zero-fill the rest
81 $curr_offset = $next_offset;
91 my $buffer = $self->engine->storage->read_at(
92 $self->offset + $self->base_size + $self->engine->byte_size, 1
95 return unpack( $StP{1}, $buffer );
101 $StP{$self->engine->byte_size},
102 $self->engine->storage->read_at(
103 $self->offset + $self->base_size,
104 $self->engine->byte_size,
114 my $chain_loc = $self->chain_loc;
116 $data .= $self->engine->storage->read_at(
117 $self->offset + $self->base_size + $self->engine->byte_size + 1, $self->data_length,
120 last unless $chain_loc;
122 $self = $self->engine->load_sector( $chain_loc );