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package MaxMind::DB::Reader::Role::Sysreader; |
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268215
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use strict; |
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678
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119
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use warnings; |
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use namespace::autoclean; |
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129
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1317
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use autodie; |
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129
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our $VERSION = '1.000014'; |
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114666
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use Carp qw( confess ); |
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1620
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use MaxMind::DB::Types qw( FileHandle Int ); |
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1204
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138
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use Moo::Role; |
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182
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has data_source => ( |
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is => 'ro', |
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isa => FileHandle, |
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lazy => 1, |
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builder => '_build_data_source', |
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); |
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has _data_source_size => ( |
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is => 'ro', |
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isa => Int, |
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lazy => 1, |
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builder => '_build_data_source_size', |
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); |
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## no critic (Subroutines::ProhibitUnusedPrivateSubroutines) |
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sub _read { |
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17069
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17069
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192899
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my $self = shift; |
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17069
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25382
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my $buffer = shift; |
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17069
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25946
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my $offset = shift; |
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17069
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28070
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my $wanted_size = shift; |
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17069
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26401
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my $seek_from_end = shift; |
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17069
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276977
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my $source = $self->data_source; |
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17069
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100
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161306
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seek $source, $offset, $seek_from_end ? 2 : 0; |
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17069
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795514
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my $read_offset = 0; |
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17069
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28144
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while (1) { |
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my $read_size = read( |
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$source, |
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17070
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25237
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${$buffer}, |
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17070
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55129
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$wanted_size, |
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$read_offset, |
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); |
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49
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17070
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893182
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confess $! unless defined $read_size; |
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# This error message doesn't provide much context, but it should only |
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# be thrown because of a fundamental logic error in the reader code, |
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# _or_ because the writer generated a database with broken pointers |
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# and/or broken data elements. |
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17070
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100
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37516
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confess 'Attempted to read past the end of a file/memory buffer' |
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if $read_size == 0; |
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58
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17069
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100
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50047
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return if $wanted_size == $read_size; |
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60
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1
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3
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$wanted_size -= $read_size; |
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1
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3
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$read_offset += $read_size; |
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} |
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64
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0
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0
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return; |
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} |
66
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## use critic |
67
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68
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sub _build_data_source { |
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0
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0
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0
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my $class = ref shift; |
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71
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0
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0
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die |
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"You must provide a data_source parameter to the constructor for $class"; |
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} |
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75
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sub _build_data_source_size { |
76
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58
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58
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702
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my $self = shift; |
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78
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58
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50
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944
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my @stat = stat( $self->data_source ) or die $!; |
79
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58
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3034
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return $stat[7]; |
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} |
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82
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1; |