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# SMB Perl library, Copyright (C) 2014-2018 Mikhael Goikhman, migo@cpan.org |
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# |
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# This program is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see . |
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package SMB::Packer; |
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use strict; |
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use warnings; |
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use bytes; |
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use if (1 << 32 == 1), 'bigint'; # support native uint64 on 32-bit platforms |
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use Encode 'encode'; |
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8431
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sub new ($$) { |
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my $class = shift; |
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my $self = bless {}, $class; |
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return $self->reset; |
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} |
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sub reset ($) { |
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my $self = shift; |
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$self->{data} = ''; |
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$self->{offset} = 0; |
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$self->{marks} = {}; |
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$self->{stubs} = {}; |
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return $self; |
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} |
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sub data { $_[0]->{data} } |
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sub size { length($_[0]->{data}) } |
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sub offset { $_[0]->{offset} } |
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sub zero ($$) { |
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my $self = shift; |
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my $n_bytes = shift // die; |
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substr($self->{data}, $self->{offset}, $n_bytes) = "\0" x $n_bytes; |
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return $self->skip($n_bytes); |
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} |
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sub skip ($$) { |
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my $self = shift; |
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my $n_bytes = shift // die; |
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my $n_avail = $self->{offset} + $n_bytes > $self->size |
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100
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? $self->size - $self->{offset} : $n_bytes; |
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$self->{offset} += $n_avail; |
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$self->zero($n_bytes - $n_avail) if $n_avail < $n_bytes; |
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return $self; |
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} |
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sub stub ($$$) { |
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my $self = shift; |
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my $name = shift // ''; |
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my $type = shift // ''; |
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die "type must be either size of bytes or uint{8,16{,_be},32{,_be},64}" |
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unless $type =~ /^uint(8|16(_be)?|32(_be)?|64)$/ || $type =~ /^\d+$/; |
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$self->{stubs}{$name} = [ $self->{offset}, $type ]; |
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$type =~ /^\d+$/ |
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? $self->bytes("\0" x $type) |
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: $self->$type(0); |
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return $self; |
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} |
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sub fill ($$) { |
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my $self = shift; |
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my $name = shift // ''; |
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my $data = shift // die; |
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my $curr_offset = $self->{offset}; |
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my ($offset, $type) = @{$self->{stubs}{$name} || die "No previously set stub '$name'"}; |
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$self->{offset} = $offset; |
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$type =~ /^\d+$/ |
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? $self->bytes($data) |
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: $self->$type($data); |
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$self->{offset} = $curr_offset; |
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return $self; |
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} |
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sub mark ($$) { |
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my $self = shift; |
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my $name = shift // ''; |
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$self->{marks}{$name} = $self->{offset}; |
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return $self; |
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} |
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sub jump ($$) { |
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my $self = shift; |
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my $name = shift // ''; |
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$self->{offset} = $self->{marks}{$name} || 0; |
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return $self; |
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} |
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sub diff ($$) { |
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my $self = shift; |
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100
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my $name = shift // ''; |
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100
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return $self->{offset} - ($self->{marks}{$name} || 0); |
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} |
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128
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sub align ($;$$) { |
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my $self = shift; |
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my $name = shift; |
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my $step = shift || 4; |
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$self->skip(($step - $self->diff($name) % $step) % $step); |
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return $self; |
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} |
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138
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my %UINT_MODS = ( |
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+1 => 'C', |
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+2 => 'v', |
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+4 => 'V', |
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-1 => 'C', |
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-2 => 'n', |
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-4 => 'N', |
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); |
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147
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sub uint ($$$$) { |
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0
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394
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my $self = shift; |
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306
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my $n_bytes = shift; |
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470
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my $be_factor = shift() ? -1 : 1; |
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306
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335
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my $i = shift; |
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153
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306
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970
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return $self->bytes(pack($UINT_MODS{$be_factor * $n_bytes}, $i)); |
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} |
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156
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sub str ($$;$) { |
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my $self = shift; |
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my $str = shift; |
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my $enc = shift || 'UTF-16LE'; |
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return $self->bytes(encode($enc, $str)); |
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} |
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164
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sub bytes ($$) { |
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357
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357
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1
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11388
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my $self = shift; |
166
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357
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448
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my $data = shift; |
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168
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357
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100
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693
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$data = join('', @$data) if ref($data) eq 'ARRAY'; |
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170
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357
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substr($self->{data}, $self->{offset}, length($data)) = $data; |
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$self->{offset} += length($data); |
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357
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return $self; |
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} |
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1
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3950
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sub uint8 { uint($_[0], 1, 0, $_[1]); } |
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1
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sub uint16 { uint($_[0], 2, 0, $_[1]); } |
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162
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1
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1050
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sub uint32 { uint($_[0], 4, 0, $_[1]); } |
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6
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1
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1773
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sub uint16_be { uint($_[0], 2, 1, $_[1]); } |
180
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3
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3
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1
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738
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sub uint32_be { uint($_[0], 4, 1, $_[1]); } |
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1
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91
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sub uint64 { uint32($_[0], $_[1] & 0xffffffff); uint32($_[0], $_[1] >> 32); } |
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182
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1
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1
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5
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sub utf16 { str($_[0], $_[1]); } |
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0
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0
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0
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sub utf16_be { str($_[0], $_[1], 'UTF-16BE'); } |
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0
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1
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sub fid1 { uint16($_[0], $_[1]); } |
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1
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1
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1
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10
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sub fid2 { uint64($_[0], $_[1][0]); uint64($_[0], $_[1][1]); } |
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4
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186
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187
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1; |
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189
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__END__ |