Bencode(3) User Contributed Perl Documentation Bencode(3)NAMEBencode - BitTorrent serialisation format
VERSION
version 1.4
SYNOPSIS
use Bencode qw( bencode bdecode );
my $bencoded = bencode { 'age' => 25, 'eyes' => 'blue' };
print $bencoded, "\n";
my $decoded = bdecode $bencoded;
DESCRIPTION
This module implements the BitTorrent bencode serialisation format as
described in <http://www.bittorrent.org/protocol.html>.
INTERFACE
"bencode( $datastructure )"
Takes a single argument which may be a scalar or a reference to a
scalar, array or hash. Arrays and hashes may in turn contain values of
these same types. Simple scalars that look like canonically represented
integers will be serialised as such. To bypass the heuristic and force
serialisation as a string, use a reference to a scalar.
Croaks on unhandled data types.
"bdecode( $string [, $do_lenient_decode [, $max_depth ] ] )"
Takes a string and returns the corresponding deserialised data
structure.
If you pass a true value for the second option, it will disregard the
sort order of dict keys. This violation of the bencode format is
somewhat common.
If you pass an integer for the third option, it will croak when
attempting to parse dictionaries nested deeper than this level, to
prevent DoS attacks using maliciously crafted input.
Croaks on malformed data.
DIAGNOSTICS
"trailing garbage at %s"
Your data does not end after the first bencode-serialised item.
You may also get this error if a malformed item follows.
"garbage at %s"
Your data is malformed.
"unexpected end of data at %s"
Your data is truncated.
"unexpected end of string data starting at %s"
Your data includes a string declared to be longer than the
available data.
"malformed string length at %s"
Your data contained a string with negative length or a length with
leading zeroes.
"malformed integer data at %s"
Your data contained something that was supposed to be an integer
but didn't make sense.
"dict key not in sort order at %s"
Your data violates the bencode format constaint that dict keys must
appear in lexical sort order.
"duplicate dict key at %s"
Your data violates the bencode format constaint that all dict keys
must be unique.
"dict key is not a string at %s"
Your data violates the bencode format constaint that all dict keys
be strings.
"dict key is missing value at %s"
Your data contains a dictionary with an odd number of elements.
"nesting depth exceeded at %s"
Your data contains dicts or lists that are nested deeper than the
$max_depth passed to "bdecode()".
"unhandled data type"
You are trying to serialise a data structure that consists of data
types other than
· scalars
· references to arrays
· references to hashes
· references to scalars
The format does not support this.
BUGS AND LIMITATIONS
Strings and numbers are practically indistinguishable in Perl, so
"bencode()" has to resort to a heuristic to decide how to serialise a
scalar. This cannot be fixed.
Please report any bugs or feature requests through the web interface at
<http://github.com/ap/Bencode/issues>.
AUTHOR
Aristotle Pagaltzis <pagaltzis@gmx.de>
COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by Aristotle Pagaltzis.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
perl v5.14.0 2010-07-06 Bencode(3)
