/usr/share/perl5/Net/SFTP/Foreign/Buffer.pm is in libnet-sftp-foreign-perl 1.81+dfsg-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 | package Net::SFTP::Foreign::Buffer;
our $VERSION = '1.68_05';
use strict;
use warnings;
no warnings 'uninitialized';
use Carp;
use constant HAS_QUADS => do {
local $@;
local $SIG{__DIE__};
no warnings;
eval q{
pack(Q => 0x1122334455667788) eq "\x11\x22\x33\x44\x55\x66\x77\x88"
}
};
sub new {
my $class = shift;
my $data = '';
@_ and put(\$data, @_);
bless \$data, $class;
}
sub make { bless \$_[1], $_[0] }
sub bytes { ${$_[0]} }
sub get_int8 {
length ${$_[0]} >=1 or return undef;
unpack(C => substr(${$_[0]}, 0, 1, ''));
}
sub get_int16 {
length ${$_[0]} >=2 or return undef;
unpack(n => substr(${$_[0]}, 0, 2, ''));
}
sub get_int32 {
length ${$_[0]} >=4 or return undef;
unpack(N => substr(${$_[0]}, 0, 4, ''));
}
sub get_int32_untaint {
my ($v) = substr(${$_[0]}, 0, 4, '') =~ /(.*)/s;
get_int32(\$v);
}
sub get_int64_quads {
length ${$_[0]} >= 8 or return undef;
unpack Q => substr(${$_[0]}, 0, 8, '')
}
sub get_int64_no_quads {
length ${$_[0]} >= 8 or return undef;
my ($big, $small) = unpack(NN => substr(${$_[0]}, 0, 8, ''));
if ($big) {
# too big for an integer, try to handle it as a float:
my $high = $big * 4294967296;
my $result = $high + $small;
unless ($result - $high == $small) {
# too big event for a float, use a BigInt;
require Math::BigInt;
$result = Math::BigInt->new($big);
$result <<= 32;
$result += $small;
}
return $result;
}
return $small;
}
*get_int64 = (HAS_QUADS ? \&get_int64_quads : \&get_int64_no_quads);
sub get_int64_untaint {
my ($v) = substr(${$_[0]}, 0, 8, '') =~ /(.*)/s;
get_int64(\$v);
}
sub get_str {
my $self = shift;
length $$self >=4 or return undef;
my $len = unpack(N => substr($$self, 0, 4, ''));
length $$self >=$len or return undef;
substr($$self, 0, $len, '');
}
sub get_str_list {
my $self = shift;
my @a;
if (my $n = $self->get_int32) {
for (1..$n) {
my $str = $self->get_str;
last unless defined $str;
push @a, $str;
}
}
return @a;
}
sub get_attributes { Net::SFTP::Foreign::Attributes->new_from_buffer($_[0]) }
sub skip_bytes { substr(${$_[0]}, 0, $_[1], '') }
sub skip_str {
my $self = shift;
my $len = $self->get_int32;
substr($$self, 0, $len, '');
}
sub put_int8 { ${$_[0]} .= pack(C => $_[1]) }
sub put_int32 { ${$_[0]} .= pack(N => $_[1]) }
sub put_int64_quads { ${$_[0]} .= pack(Q => $_[1]) }
sub put_int64_no_quads {
if ($_[1] >= 4294967296) {
my $high = int ( $_[1] / 4294967296);
my $low = int ($_[1] - $high * 4294967296);
${$_[0]} .= pack(NN => $high, $low)
}
else {
${$_[0]} .= pack(NN => 0, $_[1])
}
}
*put_int64 = (HAS_QUADS ? \&put_int64_quads : \&put_int64_no_quads);
sub put_str {
utf8::downgrade($_[1]) or croak "UTF8 data reached the SFTP buffer";
${$_[0]} .= pack(N => length($_[1])) . $_[1]
}
sub put_char { ${$_[0]} .= $_[1] }
sub _attrs_as_buffer {
my $attrs = shift;
my $ref = ref $attrs;
Net::SFTP::Foreign::Attributes->isa($ref)
or croak("Object of class Net::SFTP::Foreign::Attributes "
. "expected, $ref found");
$attrs->as_buffer;
}
sub put_attributes { ${$_[0]} .= ${_attrs_as_buffer $_[1]} }
my %unpack = ( int8 => \&get_int8,
int32 => \&get_int32,
int64 => \&get_int64,
str => \&get_str,
attr => \&get_attributtes );
sub get {
my $buf = shift;
map { $unpack{$_}->($buf) } @_;
}
my %pack = ( int8 => sub { pack C => $_[0] },
int32 => sub { pack N => $_[0] },
int64 => sub {
if (HAS_QUADS) {
return pack(Q => $_[0])
}
else {
if ($_[0] >= 4294967296) {
my $high = int ( $_[0] / 4294967296);
my $low = int ($_[0] - $high * 4294967296);
return pack(NN => $high, $low)
}
else {
return pack(NN => 0, $_[0])
}
}
},
str => sub { pack(N => length($_[0])), $_[0] },
char => sub { $_[0] },
attr => sub { ${_attrs_as_buffer $_[0]} } );
sub put {
my $buf =shift;
@_ & 1 and croak "bad number of arguments for put (@_)";
my @parts;
while (@_) {
my $type = shift;
my $value = shift;
my $packer = $pack{$type} or Carp::confess("internal error: bad packing type '$type'");
push @parts, $packer->($value)
}
$$buf.=join('', @parts);
}
1;
__END__
=head1 NAME
Net::SFTP::Foreign::Buffer - Read/write buffer class
=head1 SYNOPSIS
use Net::SFTP::Foreign::Buffer;
my $buffer = Net::SFTP::Foreign::Buffer->new;
=head1 DESCRIPTION
I<Net::SFTP::Foreign::Buffer> provides read/write buffer functionality for
SFTP.
=head1 AUTHOR & COPYRIGHTS
Please see the Net::SFTP::Foreign manpage for author, copyright, and
license information.
=cut
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