/usr/share/perl5/MLDBM/Sync/SDBM_File.pm is in libmldbm-sync-perl 0.30-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | package MLDBM::Sync::SDBM_File;
$VERSION = .17;
use SDBM_File;
use strict;
use vars qw(@ISA $MaxSegments $MaxSegmentLength %KEYS $Zlib $VERSION);
@ISA = qw(SDBM_File);
$MaxSegments = 8192; # to a 1M limit
# leave room for key index pad
$MaxSegmentLength = 128;
eval "use Compress::Zlib";
$Zlib = $@ ? 0 : 1;
sub FETCH {
my($self, $key) = @_;
my $segment_length = $MaxSegmentLength;
my $total_rv;
for(my $index = 0; $index < $MaxSegments; $index++) {
my $rv = $self->SUPER::FETCH(_index_key($key, $index));
if(defined $rv) {
$total_rv ||= '';
$total_rv .= $rv;
last if length($rv) < $segment_length;
} else {
last;
}
}
if(defined $total_rv) {
$total_rv =~ s/^(..)//s;
my $type = $1;
if($type eq 'G}') {
$total_rv = uncompress($total_rv);
} elsif ($type eq 'N}') {
# nothing
} else {
# old SDBM_File ?
$total_rv = $type . $total_rv;
}
}
$total_rv;
}
sub STORE {
my($self, $key, $value) = @_;
my $segment_length = $MaxSegmentLength;
# DELETE KEYS FIRST
for(my $index = 0; $index < $MaxSegments; $index++) {
my $index_key = _index_key($key, $index);
my $rv = $self->SUPER::FETCH($index_key);
if(defined $rv) {
$self->SUPER::DELETE($index_key);
} else {
last;
}
last if length($rv) < $segment_length;
}
# G - Gzip compression
# N - No compression
#
my $old_value = $value;
$value = ($Zlib && (length($value) >= $segment_length/2)) ? "G}".compress($value) : "N}".$value;
my($total_rv, $last_index);
for(my $index = 0; $index < $MaxSegments; $index++) {
if($index == $MaxSegments) {
die("can't store more than $MaxSegments segments of $MaxSegmentLength bytes per key in ".__PACKAGE__);
}
$value =~ s/^(.{0,$segment_length})//so;
my $segment = $1;
last if length($segment) == 0;
# print "STORING "._index_key($key, $index)." $segment\n";
my $rv = $self->SUPER::STORE(_index_key($key, $index), $segment);
$total_rv .= $segment;
$last_index = $index;
}
# use Time::HiRes;
# print "[".&Time::HiRes::time()."] STORED ".($last_index+1)." segments for length ".
# length($total_rv)." bytes for value ".length($old_value)."\n";
$old_value;
}
sub DELETE {
my($self, $key) = @_;
my $segment_length = $MaxSegmentLength;
my $total_rv;
for(my $index = 0; $index < $MaxSegments; $index++) {
my $index_key = _index_key($key, $index);
my $rv = $self->SUPER::FETCH($index_key) || '';
$self->SUPER::DELETE($index_key);
$total_rv ||= '';
$total_rv .= $rv;
last if length($rv) < $segment_length;
}
$total_rv =~ s/^(..)//s;
my $type = $1;
if($type eq 'G}') {
$total_rv = uncompress($total_rv);
} elsif ($type eq 'N}') {
# normal
} else {
# old SDBM_File
$total_rv = $type.$total_rv;
}
$total_rv;
}
sub FIRSTKEY {
my $self = shift;
my $key = $self->SUPER::FIRSTKEY();
my @keys = ();
if (defined $key) {
do {
if($key !~ /\*\*\d+$/s) {
if(my $new_key = _decode_key($key)) {
push(@keys, $new_key);
}
}
} while($key = $self->SUPER::NEXTKEY($key));
}
$KEYS{$self} = \@keys;
$self->NEXTKEY;
}
sub NEXTKEY {
my $self = shift;
shift(@{$KEYS{$self}});
}
sub _index_key {
my($key, $index) = @_;
$key =~ s/([\%\*])/uc sprintf("%%%02x",ord($1))/esg;
$index ? $key.'**'.$index : $key;
}
sub _decode_key {
my $key = shift;
$key =~ s/%([0-9a-fA-F]{2})/pack("c",hex($1))/ge;
$key;
}
1;
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