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   }
   if ($res) {
    my $base = int $self->{sig_len} / 8 + $self->{sig_len} % 8 != 0;
    substr $self->{buf}, -$base, $base, '';
    my @demanglers = (sub { $_[0] }, \&decode_utf8, \&thaw  );
    #        BM_DATA_{PLAIN,         UTF8,          STORABLE}
    $self->{msg} = defined $demanglers[$self->{type}]
                    ? do {
                       local $SIG{__DIE__} = sub { warn @_ };
                       $demanglers[$self->{type}]->($self->{buf})
                      }
                    : $self->{buf};
    $self->reset;
    $self->{done}->($self, $self->{msg}) if $self->{done};
    return;
   }
  }

 } elsif ($self->{state} == 2) { # header

  vec($self->{buf}, $self->{len}++, 1) = $bit;
  if ($self->{len} >= 3) {
   my $type = 2 * vec($self->{buf}, 1, 1)
                + vec($self->{buf}, 0, 1);
   $type = BM_DATA_PLAIN if vec($self->{buf}, 2, 1);
   @{$self}{qw<state type buf len>} = (3, $type, '', 0);
  }

 } elsif ($self->{state} == 1) { # end of signature

  if ($self->{sig_bit} != $bit) {
   $self->{state} = 2;
  }
  vec($self->{sig}, $self->{sig_len}++, 1) = $bit;

 } else { # first bit

  @{$self}{qw<state sig sig_bit sig_len buf len>}
           = (1,    '', $bit,   1,      '', 0  );
  vec($self->{sig}, 0, 1) = $bit;

 }

 return $self;
}

=head2 C<reset>

Resets the current receiver state, obliterating any current message being received.

=cut

sub reset {
 my ($self) = @_;
 _check_self($self);
 $self->{state} = 0;
 @{$self}{qw<sig sig_bit sig_len type buf len>} = ();
 return $self;
}

=head2 C<busy>

True when the receiver is in the middle of assembling a message.

=cut

sub busy {
 my ($self) = @_;
 _check_self($self);
 return $self->{state} > 0;
}

=head2 C<msg>

The last message completed, or C<undef> when no message has been assembled yet.

=cut

sub msg {
 my ($self) = @_;
 _check_self($self);
 return $self->{msg};
}

=head1 EXPORT

An object module shouldn't export any function, and so does this one.

=head1 DEPENDENCIES

L<Carp> (standard since perl 5), L<Encode> (since perl 5.007003), L<Storable> (idem).

=head1 SEE ALSO

L<Bit::MorseSignals>, L<Bit::MorseSignals::Emitter>.

=head1 AUTHOR

Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.

You can contact me by mail or on C<irc.perl.org> (vincent).

=head1 BUGS

Please report any bugs or feature requests to C<bug-bit-morsesignals-receiver at rt.cpan.org>, or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Bit-MorseSignals>.  I will be notified, and then you'll automatically be n...

=head1 SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Bit::MorseSignals::Receiver

Tests code coverage report is available at L<http://www.profvince.com/perl/cover/Bit-MorseSignals>.

=head1 COPYRIGHT & LICENSE

Copyright 2008 Vincent Pit, all rights reserved.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut

1; # End of Bit::MorseSignals::Receiver