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    croak "Unrecognised BISON data (no signature found)"
      unless substr( $data, 0, 3 ) eq FMB;

    my @data = map { ord $_ } split //, $data;
    my $len = @data;
    splice @data, 0, 3;

    if ( @data && $data[0] == VERSION ) {
        $self->_decode_version( \@data );
    }

    my $obj = eval { $self->_decode( \@data ) };

    if ( $@ ) {
        my $pos = $len - @data - 1;
        chomp $@;
        croak
          sprintf( "%s at offset %d (0x%x) in data stream", $@, $pos, $pos );
    }

    return $obj;
}

1;
__END__

=head1 NAME

Data::BISON::Decoder - Decode a BISON encoded data structure.

=head1 VERSION

This document describes Data::BISON::Decoder version 0.0.3

=head1 SYNOPSIS

    use Data::BISON::Decoder;

    my $dec = Data::BISON::Decoder->new;

    my $struct = $dec->decode( $bison_encoded_data );
  
=head1 DESCRIPTION

BISON is a binary format for language independent serialisation of data.
You can find Kai Jäger's original description of it here:

L<http://www.kaijaeger.com/articles/introducing-bison-binary-interchange-standard.html>

=head1 INTERFACE 

=over

=item C<< new >>

Create a new Data::BISON::Encoder.

=item C<< decode >>

Decode BISON serialized data. The data to be decoded may optionally have
been yEnc encoded; C<decode> will detect this and perform the
appropriate decoding.

The returned value is a scalar, hash reference or array reference.

=back

=head1 DIAGNOSTICS

=over

=item C<< Unrecognised BISON data (no signature found) >>

You attempted to decode data that didn't start with the BISON signature 'FMB'.

=item C<< Unrecognised object type %s at offset %s in data stream >>

The BISON parser found a syntax error at the specified offset in the data.

=back

=head1 CONFIGURATION AND ENVIRONMENT
  
Data::BISON::Decoder requires no configuration files or environment variables.

=head1 DEPENDENCIES

None.

=head1 INCOMPATIBILITIES

None reported.

=head1 BUGS AND LIMITATIONS

No bugs have been reported.

Please report any bugs or feature requests to
C<bug-data-bison@rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org>.

=head1 AUTHOR

Andy Armstrong  C<< <andy@hexten.net> >>

Kai Jäger (L<< http://www.kaijaeger.com >>) designed BISON and wrote
the Javascript and PHP implementations.

=head1 LICENCE AND COPYRIGHT

Copyright (c) 2007, Andy Armstrong C<< <andy@hexten.net> >>. All rights reserved.

This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself. See L<perlartistic>.

=head1 DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES