Net-Knuddels/Net/Knuddels.pm

package Net::Knuddels;

use Net::Knuddels::Dictionary;

use strict;
use utf8;

use Carp;
use Math::BigInt;

sub hash_pw($$) {
   my ($challenge, $pw) = @_;

   my $l1 = length $pw;
   my $l2 = length $challenge;

   my $k = chr ($l1 ^ ($l2 << 4));

   my $l = $l1 < $l2 ? $l2 : $l1;

   my $xor = substr +($pw x 100) ^ ($challenge x 100) ^ ($k x 100), 0, $l;

   my ($i, $j);

   --$l;

   if ($l <= 17) {
      for (0 .. $l) {
         $i = $i * 3 + ord substr $xor, $l - $_;
         $j = $j * 5 + ord substr $xor, $_;

         $i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
         $j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
      }
   } else {
      for ($_ = $l; $_ >= 0; $_ -= int $_/19) {
         $i = $i * 5 + ord substr $xor, $_;
         $j = $j * 3 + ord substr $xor, $l - $_;

         $i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
         $j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
      }
   }

   $i ^= $j;

   ($i & 0xffffff) ^ ($i >> 24);
}

package Net::Knuddels::Protocol;

=head2 CLASS Net::Knuddels::Protocol

You B<must> call the C<destroy> method of this class when you no longer
use it, as circular references will keep the object alive otherwise.

=over 4

=item new

Create a new C<Net::Knuddels::Protocol> object.

=cut

sub new {
   my $class = shift;

   my %data;

   my $self = bless {
      @_
   }, $class;

   $self->register ("(" => sub {
      $self->{challenge} = $_[1];
      $self->{room}      = $_[2];
      $self->feed_event ("connected");
   });

   $self;
}

=item $protocol->feed_data ($octets)

Feed raw protocol data into the decoder.

=cut

sub feed_data($$) {
   my ($self, $data) = @_;

   # split data stream into packets

   $data = "$self->{rbuf}$data";

   while () {
      1 <= length $data or last;
      my $len = ord substr $data, 0, 1;

      my $skip;
      if ($len & 0x80) {
         my $tail = (($len >> 5) & 3) - 1;
         $len = ($len & 0x1f) + 1;

         $tail < length $data or last;
         $len += (ord substr $data, $_ + 1, 1) << ($_ * 8 + 5)
            for 0 .. $tail;

         $skip = 2 + $tail;
      } else {
         $skip = 1;
         $len++;
      }

      $len + $skip <= length $data or last;
      substr $data, 0, $skip, "";
      my $msg = substr $data, 0, $len, "";

      $self->feed_msg ($msg);
   }

   $self->{rbuf} = $data;
}

my $RE_dec = join "|", keys %$Net::Knuddels::Dictionary;

sub feed_msg($$) {
   my ($self, $msg) = @_;

   my $bin = unpack "b*", $msg;
   my $res = "";

   while ($bin =~ /\G($RE_dec)/cmog) {
      my $frag = $Net::Knuddels::Dictionary->{$1};
      $frag = pack "b*", $bin =~ /\G.{16}/cmg && $1 if $frag eq "\\\\\\";
      $res .= $frag;
   }
   $bin =~ /\G(.*[^0].*)$/ and die "Net::Knuddels::Receiver: undecodable message tail '$1'";

   $self->feed_event (split /\0/, $res);
}

sub feed_event($@) {
   my ($self, $type, @arg) = @_;

   for ($type, "ALL") {
      my $ev = $self->{cb}{$_};
      $_->($type, @arg) for values %$ev;
   }
}

=item $protocol->register ($type => $callback)

Register a callback for events of type C<$type>, which is either the name
of a low-level event sent by the server (such as "k" for dialog box) or
the name of a generated event, such as C<connected>.

=cut

sub register {
   my ($self, $type, $cb) = @_;

   $self->{cb}{$type}{$cb} = $cb;
}

sub destroy {
   my ($self) = @_;

   delete $self->{cb};
}

=back

=cut

1;

Revision:	1.7
Committed:	Wed Jan 12 20:22:01 2005 UTC (21 years, 8 months ago) by root
Branch:	MAIN
Changes since 1.6:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	package Net::Knuddels;
2
3	root	1.3	use Net::Knuddels::Dictionary;
4
5	root	1.2	use strict;
6			use utf8;
7
8	root	1.4	use Carp;
9			use Math::BigInt;
10
11			sub hash_pw($$) {
12			my ($challenge, $pw) = @_;
13
14			my $l1 = length $pw;
15			my $l2 = length $challenge;
16
17			my $k = chr ($l1 ^ ($l2 << 4));
18
19			my $l = $l1 < $l2 ? $l2 : $l1;
20
21			my $xor = substr +($pw x 100) ^ ($challenge x 100) ^ ($k x 100), 0, $l;
22
23			my ($i, $j);
24
25			--$l;
26
27			if ($l <= 17) {
28			for (0 .. $l) {
29			$i = $i * 3 + ord substr $xor, $l - $_;
30			$j = $j * 5 + ord substr $xor, $_;
31
32			$i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
33			$j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
34			}
35			} else {
36			for ($_ = $l; $_ >= 0; $_ -= int $_/19) {
37			$i = $i * 5 + ord substr $xor, $_;
38			$j = $j * 3 + ord substr $xor, $l - $_;
39
40			$i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
41			$j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
42			}
43			}
44
45			$i ^= $j;
46
47			($i & 0xffffff) ^ ($i >> 24);
48			}
49
50	root	1.5	package Net::Knuddels::Protocol;
51
52			=head2 CLASS Net::Knuddels::Protocol
53
54			You B<must> call the C<destroy> method of this class when you no longer
55			use it, as circular references will keep the object alive otherwise.
56
57	root	1.6	=over 4
58
59			=item new
60
61			Create a new C<Net::Knuddels::Protocol> object.
62
63	root	1.5	=cut
64	root	1.2
65			sub new {
66			my $class = shift;
67
68	root	1.4	my %data;
69
70			my $self = bless {
71			@_
72			}, $class;
73
74			$self->register ("(" => sub {
75			$self->{challenge} = $_[1];
76			$self->{room} = $_[2];
77			$self->feed_event ("connected");
78			});
79
80			$self;
81	root	1.2	}
82
83	root	1.6	=item $protocol->feed_data ($octets)
84
85			Feed raw protocol data into the decoder.
86
87			=cut
88
89	root	1.2	sub feed_data($$) {
90			my ($self, $data) = @_;
91
92			# split data stream into packets
93
94			$data = "$self->{rbuf}$data";
95
96			while () {
97			1 <= length $data or last;
98			my $len = ord substr $data, 0, 1;
99
100			my $skip;
101			if ($len & 0x80) {
102			my $tail = (($len >> 5) & 3) - 1;
103			$len = ($len & 0x1f) + 1;
104
105			$tail < length $data or last;
106			$len += (ord substr $data, $_ + 1, 1) << ($_ * 8 + 5)
107			for 0 .. $tail;
108
109			$skip = 2 + $tail;
110			} else {
111			$skip = 1;
112			$len++;
113			}
114
115			$len + $skip <= length $data or last;
116			substr $data, 0, $skip, "";
117			my $msg = substr $data, 0, $len, "";
118
119			$self->feed_msg ($msg);
120			}
121
122			$self->{rbuf} = $data;
123			}
124
125	root	1.3	my $RE_dec = join "\|", keys %$Net::Knuddels::Dictionary;
126	root	1.1
127	root	1.2	sub feed_msg($$) {
128			my ($self, $msg) = @_;
129	root	1.1
130			my $bin = unpack "b*", $msg;
131			my $res = "";
132
133	root	1.2	while ($bin =~ /\G($RE_dec)/cmog) {
134	root	1.3	my $frag = $Net::Knuddels::Dictionary->{$1};
135	root	1.7	$frag = pack "b*", $bin =~ /\G.{16}/cmg && $1 if $frag eq "\\\\\\";
136	root	1.1	$res .= $frag;
137			}
138	root	1.2	$bin =~ /\G(.[^0].)$/ and die "Net::Knuddels::Receiver: undecodable message tail '$1'";
139
140			$self->feed_event (split /\0/, $res);
141	root	1.1	}
142
143	root	1.2	sub feed_event($@) {
144			my ($self, $type, @arg) = @_;
145	root	1.1
146	root	1.2	for ($type, "ALL") {
147			my $ev = $self->{cb}{$_};
148			$_->($type, @arg) for values %$ev;
149	root	1.1	}
150	root	1.2	}
151	root	1.1
152	root	1.6	=item $protocol->register ($type => $callback)
153
154			Register a callback for events of type C<$type>, which is either the name
155			of a low-level event sent by the server (such as "k" for dialog box) or
156			the name of a generated event, such as C<connected>.
157
158			=cut
159
160	root	1.2	sub register {
161			my ($self, $type, $cb) = @_;
162	root	1.1
163	root	1.2	$self->{cb}{$type}{$cb} = $cb;
164	root	1.1	}
165
166	root	1.5	sub destroy {
167			my ($self) = @_;
168
169			delete $self->{cb};
170			}
171
172	root	1.6	=back
173
174			=cut
175
176	root	1.2	1;
177