[ViewVC] Diff of: cvs/CBOR-XS/XS.pm

Comparing CBOR-XS/XS.pm (file contents):
Revision 1.40 by root, Sun Jan 5 14:24:54 2014 UTC vs.
Revision 1.90 by root, Sat Nov 18 18:19:57 2023 UTC

…		…
38	with the added ability of supporting serialisation of Perl objects. (JSON	38	with the added ability of supporting serialisation of Perl objects. (JSON
39	often compresses better than CBOR though, so if you plan to compress the	39	often compresses better than CBOR though, so if you plan to compress the
40	data later and speed is less important you might want to compare both	40	data later and speed is less important you might want to compare both
41	formats first).	41	formats first).
42		42
		43	The primary goal of this module is to be I<correct> and the secondary goal
		44	is to be I<fast>. To reach the latter goal it was written in C.
		45
43	To give you a general idea about speed, with texts in the megabyte range,	46	To give you a general idea about speed, with texts in the megabyte range,
44	C<CBOR::XS> usually encodes roughly twice as fast as L<Storable> or	47	C<CBOR::XS> usually encodes roughly twice as fast as L<Storable> or
45	L<JSON::XS> and decodes about 15%-30% faster than those. The shorter the	48	L<JSON::XS> and decodes about 15%-30% faster than those. The shorter the
46	data, the worse L<Storable> performs in comparison.	49	data, the worse L<Storable> performs in comparison.
47		50
…		…
52	In addition to the core CBOR data format, this module implements a	55	In addition to the core CBOR data format, this module implements a
53	number of extensions, to support cyclic and shared data structures	56	number of extensions, to support cyclic and shared data structures
54	(see C<allow_sharing> and C<allow_cycles>), string deduplication (see	57	(see C<allow_sharing> and C<allow_cycles>), string deduplication (see
55	C<pack_strings>) and scalar references (always enabled).	58	C<pack_strings>) and scalar references (always enabled).
56		59
57	The primary goal of this module is to be I<correct> and the secondary goal
58	is to be I<fast>. To reach the latter goal it was written in C.
59
60	See MAPPING, below, on how CBOR::XS maps perl values to CBOR values and	60	See MAPPING, below, on how CBOR::XS maps perl values to CBOR values and
61	vice versa.	61	vice versa.
62		62
63	=cut	63	=cut
64		64
65	package CBOR::XS;	65	package CBOR::XS;
66		66
67	use common::sense;	67	use common::sense;
68		68
69	our $VERSION = 1.25;	69	our $VERSION = 1.87;
70	our @ISA = qw(Exporter);	70	our @ISA = qw(Exporter);
71		71
72	our @EXPORT = qw(encode_cbor decode_cbor);	72	our @EXPORT = qw(encode_cbor decode_cbor);
73		73
74	use Exporter;	74	use Exporter;
…		…
112		112
113	The mutators for flags all return the CBOR object again and thus calls can	113	The mutators for flags all return the CBOR object again and thus calls can
114	be chained:	114	be chained:
115		115
116	my $cbor = CBOR::XS->new->encode ({a => [1,2]});	116	my $cbor = CBOR::XS->new->encode ({a => [1,2]});
		117
		118	=item $cbor = new_safe CBOR::XS
		119
		120	Create a new, safe/secure CBOR::XS object. This is similar to C<new>,
		121	but configures the coder object to be safe to use with untrusted
		122	data. Currently, this is equivalent to:
		123
		124	my $cbor = CBOR::XS
		125	->new
		126	->validate_utf8
		127	->forbid_objects
		128	->filter (\&CBOR::XS::safe_filter)
		129	->max_size (1e8);
		130
		131	But is more future proof (it is better to crash because of a change than
		132	to be exploited in other ways).
		133
		134	=cut
		135
		136	sub new_safe {
		137	CBOR::XS
		138	->new
		139	->validate_utf8
		140	->forbid_objects
		141	->filter (\&CBOR::XS::safe_filter)
		142	->max_size (1e8)
		143	}
117		144
118	=item $cbor = $cbor->max_depth ([$maximum_nesting_depth])	145	=item $cbor = $cbor->max_depth ([$maximum_nesting_depth])
119		146
120	=item $max_depth = $cbor->get_max_depth	147	=item $max_depth = $cbor->get_max_depth
121		148
…		…
137		164
138	Note that nesting is implemented by recursion in C. The default value has	165	Note that nesting is implemented by recursion in C. The default value has
139	been chosen to be as large as typical operating systems allow without	166	been chosen to be as large as typical operating systems allow without
140	crashing.	167	crashing.
141		168
142	See SECURITY CONSIDERATIONS, below, for more info on why this is useful.	169	See L<SECURITY CONSIDERATIONS>, below, for more info on why this is useful.
143		170
144	=item $cbor = $cbor->max_size ([$maximum_string_size])	171	=item $cbor = $cbor->max_size ([$maximum_string_size])
145		172
146	=item $max_size = $cbor->get_max_size	173	=item $max_size = $cbor->get_max_size
147		174
…		…
152	effect on C<encode> (yet).	179	effect on C<encode> (yet).
153		180
154	If no argument is given, the limit check will be deactivated (same as when	181	If no argument is given, the limit check will be deactivated (same as when
155	C<0> is specified).	182	C<0> is specified).
156		183
157	See SECURITY CONSIDERATIONS, below, for more info on why this is useful.	184	See L<SECURITY CONSIDERATIONS>, below, for more info on why this is useful.
158		185
159	=item $cbor = $cbor->allow_unknown ([$enable])	186	=item $cbor = $cbor->allow_unknown ([$enable])
160		187
161	=item $enabled = $cbor->get_allow_unknown	188	=item $enabled = $cbor->get_allow_unknown
162		189
…		…
180	reference to the earlier value.	207	reference to the earlier value.
181		208
182	This means that such values will only be encoded once, and will not result	209	This means that such values will only be encoded once, and will not result
183	in a deep cloning of the value on decode, in decoders supporting the value	210	in a deep cloning of the value on decode, in decoders supporting the value
184	sharing extension. This also makes it possible to encode cyclic data	211	sharing extension. This also makes it possible to encode cyclic data
185	structures (which need C<allow_cycles> to ne enabled to be decoded by this	212	structures (which need C<allow_cycles> to be enabled to be decoded by this
186	module).	213	module).
187		214
188	It is recommended to leave it off unless you know your	215	It is recommended to leave it off unless you know your
189	communication partner supports the value sharing extensions to CBOR	216	communication partner supports the value sharing extensions to CBOR
190	(L<http://cbor.schmorp.de/value-sharing>), as without decoder support, the	217	(L<http://cbor.schmorp.de/value-sharing>), as without decoder support, the
191	resulting data structure might be unusable.	218	resulting data structure might be unusable.
192		219
193	Detecting shared values incurs a runtime overhead when values are encoded	220	Detecting shared values incurs a runtime overhead when values are encoded
194	that have a reference counter large than one, and might unnecessarily	221	that have a reference counter larger than one, and might unnecessarily
195	increase the encoded size, as potentially shared values are encode as	222	increase the encoded size, as potentially shared values are encoded as
196	shareable whether or not they are actually shared.	223	shareable whether or not they are actually shared.
197		224
198	At the moment, only targets of references can be shared (e.g. scalars,	225	At the moment, only targets of references can be shared (e.g. scalars,
199	arrays or hashes pointed to by a reference). Weirder constructs, such as	226	arrays or hashes pointed to by a reference). Weirder constructs, such as
200	an array with multiple "copies" of the I<same> string, which are hard but	227	an array with multiple "copies" of the I<same> string, which are hard but
…		…
219		246
220	If C<$enable> is false (the default), then C<decode> will throw an error	247	If C<$enable> is false (the default), then C<decode> will throw an error
221	when it encounters a self-referential/cyclic data structure.	248	when it encounters a self-referential/cyclic data structure.
222		249
223	This option does not affect C<encode> in any way - shared values and	250	This option does not affect C<encode> in any way - shared values and
224	references will always be decoded properly if present.	251	references will always be encoded properly if present.
		252
		253	=item $cbor = $cbor->allow_weak_cycles ([$enable])
		254
		255	=item $enabled = $cbor->get_allow_weak_cycles
		256
		257	This works like C<allow_cycles> in that it allows the resulting data
		258	structures to contain cycles, but unlike C<allow_cycles>, those cyclic
		259	rreferences will be weak. That means that code that recurrsively walks
		260	the data structure must be prepared with cycles, but at least not special
		261	precautions must be implemented to free these data structures.
		262
		263	Only those references leading to actual cycles will be weakened - other
		264	references, e.g. when the same hash or arrray is referenced multiple times
		265	in an arrray, will be normal references.
		266
		267	This option does not affect C<encode> in any way - shared values and
		268	references will always be encoded properly if present.
		269
		270	=item $cbor = $cbor->forbid_objects ([$enable])
		271
		272	=item $enabled = $cbor->get_forbid_objects
		273
		274	Disables the use of the object serialiser protocol.
		275
		276	If C<$enable> is true (or missing), then C<encode> will will throw an
		277	exception when it encounters perl objects that would be encoded using the
		278	perl-object tag (26). When C<decode> encounters such tags, it will fall
		279	back to the general filter/tagged logic as if this were an unknown tag (by
		280	default resulting in a C<CBOR::XC::Tagged> object).
		281
		282	If C<$enable> is false (the default), then C<encode> will use the
		283	L<Types::Serialiser> object serialisation protocol to serialise objects
		284	into perl-object tags, and C<decode> will do the same to decode such tags.
		285
		286	See L<SECURITY CONSIDERATIONS>, below, for more info on why forbidding this
		287	protocol can be useful.
225		288
226	=item $cbor = $cbor->pack_strings ([$enable])	289	=item $cbor = $cbor->pack_strings ([$enable])
227		290
228	=item $enabled = $cbor->get_pack_strings	291	=item $enabled = $cbor->get_pack_strings
229		292
…		…
242	the standard CBOR way.	305	the standard CBOR way.
243		306
244	This option does not affect C<decode> in any way - string references will	307	This option does not affect C<decode> in any way - string references will
245	always be decoded properly if present.	308	always be decoded properly if present.
246		309
		310	=item $cbor = $cbor->text_keys ([$enable])
		311
		312	=item $enabled = $cbor->get_text_keys
		313
		314	If C<$enabled> is true (or missing), then C<encode> will encode all
		315	perl hash keys as CBOR text strings/UTF-8 string, upgrading them as needed.
		316
		317	If C<$enable> is false (the default), then C<encode> will encode hash keys
		318	normally - upgraded perl strings (strings internally encoded as UTF-8) as
		319	CBOR text strings, and downgraded perl strings as CBOR byte strings.
		320
		321	This option does not affect C<decode> in any way.
		322
		323	This option is useful for interoperability with CBOR decoders that don't
		324	treat byte strings as a form of text. It is especially useful as Perl
		325	gives very little control over hash keys.
		326
		327	Enabling this option can be slow, as all downgraded hash keys that are
		328	encoded need to be scanned and converted to UTF-8.
		329
		330	=item $cbor = $cbor->text_strings ([$enable])
		331
		332	=item $enabled = $cbor->get_text_strings
		333
		334	This option works similar to C<text_keys>, above, but works on all strings
		335	(including hash keys), so C<text_keys> has no further effect after
		336	enabling C<text_strings>.
		337
		338	If C<$enabled> is true (or missing), then C<encode> will encode all perl
		339	strings as CBOR text strings/UTF-8 strings, upgrading them as needed.
		340
		341	If C<$enable> is false (the default), then C<encode> will encode strings
		342	normally (but see C<text_keys>) - upgraded perl strings (strings
		343	internally encoded as UTF-8) as CBOR text strings, and downgraded perl
		344	strings as CBOR byte strings.
		345
		346	This option does not affect C<decode> in any way.
		347
		348	This option has similar advantages and disadvantages as C<text_keys>. In
		349	addition, this option effectively removes the ability to automatically
		350	encode byte strings, which might break some C<FREEZE> and C<TO_CBOR>
		351	methods that rely on this.
		352
		353	A workaround is to use explicit type casts, which are unaffected by this option.
		354
247	=item $cbor = $cbor->validate_utf8 ([$enable])	355	=item $cbor = $cbor->validate_utf8 ([$enable])
248		356
249	=item $enabled = $cbor->get_validate_utf8	357	=item $enabled = $cbor->get_validate_utf8
250		358
251	If C<$enable> is true (or missing), then C<decode> will validate that	359	If C<$enable> is true (or missing), then C<decode> will validate that
…		…
256	The concept of "valid UTF-8" used is perl's concept, which is a superset	364	The concept of "valid UTF-8" used is perl's concept, which is a superset
257	of the official UTF-8.	365	of the official UTF-8.
258		366
259	If C<$enable> is false (the default), then C<decode> will blindly accept	367	If C<$enable> is false (the default), then C<decode> will blindly accept
260	UTF-8 data, marking them as valid UTF-8 in the resulting data structure	368	UTF-8 data, marking them as valid UTF-8 in the resulting data structure
261	regardless of whether thats true or not.	369	regardless of whether that's true or not.
262		370
263	Perl isn't too happy about corrupted UTF-8 in strings, but should	371	Perl isn't too happy about corrupted UTF-8 in strings, but should
264	generally not crash or do similarly evil things. Extensions might be not	372	generally not crash or do similarly evil things. Extensions might be not
265	so forgiving, so it's recommended to turn on this setting if you receive	373	so forgiving, so it's recommended to turn on this setting if you receive
266	untrusted CBOR.	374	untrusted CBOR.
…		…
288	replace the tagged value in the decoded data structure, or no values,	396	replace the tagged value in the decoded data structure, or no values,
289	which will result in default handling, which currently means the decoder	397	which will result in default handling, which currently means the decoder
290	creates a C<CBOR::XS::Tagged> object to hold the tag and the value.	398	creates a C<CBOR::XS::Tagged> object to hold the tag and the value.
291		399
292	When the filter is cleared (the default state), the default filter	400	When the filter is cleared (the default state), the default filter
293	function, C<CBOR::XS::default_filter>, is used. This function simply looks	401	function, C<CBOR::XS::default_filter>, is used. This function simply
294	up the tag in the C<%CBOR::XS::FILTER> hash. If an entry exists it must be	402	looks up the tag in the C<%CBOR::XS::FILTER> hash. If an entry exists
295	a code reference that is called with tag and value, and is responsible for	403	it must be a code reference that is called with tag and value, and is
296	decoding the value. If no entry exists, it returns no values.	404	responsible for decoding the value. If no entry exists, it returns no
		405	values. C<CBOR::XS> provides a number of default filter functions already,
		406	the the C<%CBOR::XS::FILTER> hash can be freely extended with more.
		407
		408	C<CBOR::XS> additionally provides an alternative filter function that is
		409	supposed to be safe to use with untrusted data (which the default filter
		410	might not), called C<CBOR::XS::safe_filter>, which works the same as
		411	the C<default_filter> but uses the C<%CBOR::XS::SAFE_FILTER> variable
		412	instead. It is prepopulated with the tag decoding functions that are
		413	deemed safe (basically the same as C<%CBOR::XS::FILTER> without all
		414	the bignum tags), and can be extended by user code as wlel, although,
		415	obviously, one should be very careful about adding decoding functions
		416	here, since the expectation is that they are safe to use on untrusted
		417	data, after all.
297		418
298	Example: decode all tags not handled internally into C<CBOR::XS::Tagged>	419	Example: decode all tags not handled internally into C<CBOR::XS::Tagged>
299	objects, with no other special handling (useful when working with	420	objects, with no other special handling (useful when working with
300	potentially "unsafe" CBOR data).	421	potentially "unsafe" CBOR data).
301		422
…		…
308	my ($tag, $value);	429	my ($tag, $value);
309		430
310	"tag 1347375694 value $value"	431	"tag 1347375694 value $value"
311	};	432	};
312		433
		434	Example: provide your own filter function that looks up tags in your own
		435	hash:
		436
		437	my %my_filter = (
		438	998347484 => sub {
		439	my ($tag, $value);
		440
		441	"tag 998347484 value $value"
		442	};
		443	);
		444
		445	my $coder = CBOR::XS->new->filter (sub {
		446	&{ $my_filter{$_[0]} or return }
		447	});
		448
		449
		450	Example: use the safe filter function (see L<SECURITY CONSIDERATIONS> for
		451	more considerations regarding security).
		452
		453	CBOR::XS->new->filter (\&CBOR::XS::safe_filter)->decode ($cbor_data);
		454
313	=item $cbor_data = $cbor->encode ($perl_scalar)	455	=item $cbor_data = $cbor->encode ($perl_scalar)
314		456
315	Converts the given Perl data structure (a scalar value) to its CBOR	457	Converts the given Perl data structure (a scalar value) to its CBOR
316	representation.	458	representation.
317		459
…		…
326	when there is trailing garbage after the CBOR string, it will silently	468	when there is trailing garbage after the CBOR string, it will silently
327	stop parsing there and return the number of characters consumed so far.	469	stop parsing there and return the number of characters consumed so far.
328		470
329	This is useful if your CBOR texts are not delimited by an outer protocol	471	This is useful if your CBOR texts are not delimited by an outer protocol
330	and you need to know where the first CBOR string ends amd the next one	472	and you need to know where the first CBOR string ends amd the next one
331	starts.	473	starts - CBOR strings are self-delimited, so it is possible to concatenate
		474	CBOR strings without any delimiters or size fields and recover their data.
332		475
333	CBOR::XS->new->decode_prefix ("......")	476	CBOR::XS->new->decode_prefix ("......")
334	=> ("...", 3)	477	=> ("...", 3)
335		478
336	=back	479	=back
…		…
342	Perl data structure in memory at one time, it does allow you to parse a	485	Perl data structure in memory at one time, it does allow you to parse a
343	CBOR stream incrementally, using a similar to using "decode_prefix" to see	486	CBOR stream incrementally, using a similar to using "decode_prefix" to see
344	if a full CBOR object is available, but is much more efficient.	487	if a full CBOR object is available, but is much more efficient.
345		488
346	It basically works by parsing as much of a CBOR string as possible - if	489	It basically works by parsing as much of a CBOR string as possible - if
347	the CBOR data is not complete yet, the pasrer will remember where it was,	490	the CBOR data is not complete yet, the parser will remember where it was,
348	to be able to restart when more data has been accumulated. Once enough	491	to be able to restart when more data has been accumulated. Once enough
349	data is available to either decode a complete CBOR value or raise an	492	data is available to either decode a complete CBOR value or raise an
350	error, a real decode will be attempted.	493	error, a real decode will be attempted.
351		494
352	A typical use case would be a network protocol that consists of sending	495	A typical use case would be a network protocol that consists of sending
…		…
391		534
392	Resets the incremental decoder. This throws away any saved state, so that	535	Resets the incremental decoder. This throws away any saved state, so that
393	subsequent calls to C<incr_parse> or C<incr_parse_multiple> start to parse	536	subsequent calls to C<incr_parse> or C<incr_parse_multiple> start to parse
394	a new CBOR value from the beginning of the C<$buffer> again.	537	a new CBOR value from the beginning of the C<$buffer> again.
395		538
396	This method can be caled at any time, but it I<must> be called if you want	539	This method can be called at any time, but it I<must> be called if you want
397	to change your C<$buffer> or there was a decoding error and you want to	540	to change your C<$buffer> or there was a decoding error and you want to
398	reuse the C<$cbor> object for future incremental parsings.	541	reuse the C<$cbor> object for future incremental parsings.
399		542
400	=back	543	=back
401		544
…		…
476		619
477	=item hash references	620	=item hash references
478		621
479	Perl hash references become CBOR maps. As there is no inherent ordering in	622	Perl hash references become CBOR maps. As there is no inherent ordering in
480	hash keys (or CBOR maps), they will usually be encoded in a pseudo-random	623	hash keys (or CBOR maps), they will usually be encoded in a pseudo-random
481	order. This order can be different each time a hahs is encoded.	624	order. This order can be different each time a hash is encoded.
482		625
483	Currently, tied hashes will use the indefinite-length format, while normal	626	Currently, tied hashes will use the indefinite-length format, while normal
484	hashes will use the fixed-length format.	627	hashes will use the fixed-length format.
485		628
486	=item array references	629	=item array references
…		…
504	create such objects.	647	create such objects.
505		648
506	=item Types::Serialiser::true, Types::Serialiser::false, Types::Serialiser::error	649	=item Types::Serialiser::true, Types::Serialiser::false, Types::Serialiser::error
507		650
508	These special values become CBOR true, CBOR false and CBOR undefined	651	These special values become CBOR true, CBOR false and CBOR undefined
509	values, respectively. You can also use C<\1>, C<\0> and C<\undef> directly	652	values, respectively.
510	if you want.
511		653
512	=item other blessed objects	654	=item other blessed objects
513		655
514	Other blessed objects are serialised via C<TO_CBOR> or C<FREEZE>. See	656	Other blessed objects are serialised via C<TO_CBOR> or C<FREEZE>. See
515	L<TAG HANDLING AND EXTENSIONS> for specific classes handled by this	657	L<TAG HANDLING AND EXTENSIONS> for specific classes handled by this
…		…
539	my $x = 3.1; # some variable containing a number	681	my $x = 3.1; # some variable containing a number
540	"$x"; # stringified	682	"$x"; # stringified
541	$x .= ""; # another, more awkward way to stringify	683	$x .= ""; # another, more awkward way to stringify
542	print $x; # perl does it for you, too, quite often	684	print $x; # perl does it for you, too, quite often
543		685
544	You can force whether a string ie encoded as byte or text string by using	686	You can force whether a string is encoded as byte or text string by using
545	C<utf8::upgrade> and C<utf8::downgrade>):	687	C<utf8::upgrade> and C<utf8::downgrade> (if C<text_strings> is disabled).
546		688
547	utf8::upgrade $x; # encode $x as text string	689	utf8::upgrade $x; # encode $x as text string
548	utf8::downgrade $x; # encode $x as byte string	690	utf8::downgrade $x; # encode $x as byte string
549		691
		692	More options are available, see L<TYPE CASTS>, below, and the C<text_keys>
		693	and C<text_strings> options.
		694
550	Perl doesn't define what operations up- and downgrade strings, so if the	695	Perl doesn't define what operations up- and downgrade strings, so if the
551	difference between byte and text is important, you should up- or downgrade	696	difference between byte and text is important, you should up- or downgrade
552	your string as late as possible before encoding.	697	your string as late as possible before encoding. You can also force the
		698	use of CBOR text strings by using C<text_keys> or C<text_strings>.
553		699
554	You can force the type to be a CBOR number by numifying it:	700	You can force the type to be a CBOR number by numifying it:
555		701
556	my $x = "3"; # some variable containing a string	702	my $x = "3"; # some variable containing a string
557	$x += 0; # numify it, ensuring it will be dumped as a number	703	$x += 0; # numify it, ensuring it will be dumped as a number
…		…
568	represent numerical values are supported, but might suffer loss of	714	represent numerical values are supported, but might suffer loss of
569	precision.	715	precision.
570		716
571	=back	717	=back
572		718
		719	=head2 TYPE CASTS
		720
		721	B<EXPERIMENTAL>: As an experimental extension, C<CBOR::XS> allows you to
		722	force specific CBOR types to be used when encoding. That allows you to
		723	encode types not normally accessible (e.g. half floats) as well as force
		724	string types even when C<text_strings> is in effect.
		725
		726	Type forcing is done by calling a special "cast" function which keeps a
		727	copy of the value and returns a new value that can be handed over to any
		728	CBOR encoder function.
		729
		730	The following casts are currently available (all of which are unary
		731	operators, that is, have a prototype of C<$>):
		732
		733	=over
		734
		735	=item CBOR::XS::as_int $value
		736
		737	Forces the value to be encoded as some form of (basic, not bignum) integer
		738	type.
		739
		740	=item CBOR::XS::as_text $value
		741
		742	Forces the value to be encoded as (UTF-8) text values.
		743
		744	=item CBOR::XS::as_bytes $value
		745
		746	Forces the value to be encoded as a (binary) string value.
		747
		748	Example: encode a perl string as binary even though C<text_strings> is in
		749	effect.
		750
		751	CBOR::XS->new->text_strings->encode ([4, "text", CBOR::XS::bytes "bytevalue"]);
		752
		753	=item CBOR::XS::as_bool $value
		754
		755	Converts a Perl boolean (which can be any kind of scalar) into a CBOR
		756	boolean. Strictly the same, but shorter to write, than:
		757
		758	$value ? Types::Serialiser::true : Types::Serialiser::false
		759
		760	=item CBOR::XS::as_float16 $value
		761
		762	Forces half-float (IEEE 754 binary16) encoding of the given value.
		763
		764	=item CBOR::XS::as_float32 $value
		765
		766	Forces single-float (IEEE 754 binary32) encoding of the given value.
		767
		768	=item CBOR::XS::as_float64 $value
		769
		770	Forces double-float (IEEE 754 binary64) encoding of the given value.
		771
		772	=item CBOR::XS::as_cbor $cbor_text
		773
		774	Not a type cast per-se, this type cast forces the argument to be encoded
		775	as-is. This can be used to embed pre-encoded CBOR data.
		776
		777	Note that no checking on the validity of the C<$cbor_text> is done - it's
		778	the callers responsibility to correctly encode values.
		779
		780	=item CBOR::XS::as_map [key => value...]
		781
		782	Treat the array reference as key value pairs and output a CBOR map. This
		783	allows you to generate CBOR maps with arbitrary key types (or, if you
		784	don't care about semantics, duplicate keys or pairs in a custom order),
		785	which is otherwise hard to do with Perl.
		786
		787	The single argument must be an array reference with an even number of
		788	elements.
		789
		790	Note that only the reference to the array is copied, the array itself is
		791	not. Modifications done to the array before calling an encoding function
		792	will be reflected in the encoded output.
		793
		794	Example: encode a CBOR map with a string and an integer as keys.
		795
		796	encode_cbor CBOR::XS::as_map [string => "value", 5 => "value"]
		797
		798	=back
		799
		800	=cut
		801
		802	sub CBOR::XS::as_cbor ($) { bless [$_[0], 0, undef], CBOR::XS::Tagged:: }
		803	sub CBOR::XS::as_int ($) { bless [$_[0], 1, undef], CBOR::XS::Tagged:: }
		804	sub CBOR::XS::as_bytes ($) { bless [$_[0], 2, undef], CBOR::XS::Tagged:: }
		805	sub CBOR::XS::as_text ($) { bless [$_[0], 3, undef], CBOR::XS::Tagged:: }
		806	sub CBOR::XS::as_float16 ($) { bless [$_[0], 4, undef], CBOR::XS::Tagged:: }
		807	sub CBOR::XS::as_float32 ($) { bless [$_[0], 5, undef], CBOR::XS::Tagged:: }
		808	sub CBOR::XS::as_float64 ($) { bless [$_[0], 6, undef], CBOR::XS::Tagged:: }
		809
		810	sub CBOR::XS::as_bool ($) { $_[0] ? $Types::Serialiser::true : $Types::Serialiser::false }
		811
		812	sub CBOR::XS::as_map ($) {
		813	ARRAY:: eq ref $_[0]
		814	and $#{ $_[0] } & 1
		815	or do { require Carp; Carp::croak ("CBOR::XS::as_map only acepts array references with an even number of elements, caught") };
		816
		817	bless [$_[0], 7, undef], CBOR::XS::Tagged::
		818	}
		819
573	=head2 OBJECT SERIALISATION	820	=head2 OBJECT SERIALISATION
574		821
575	This module implements both a CBOR-specific and the generic	822	This module implements both a CBOR-specific and the generic
576	L<Types::Serialier> object serialisation protocol. The following	823	L<Types::Serialier> object serialisation protocol. The following
577	subsections explain both methods.	824	subsections explain both methods.
…		…
658	"$self" # encode url string	905	"$self" # encode url string
659	}	906	}
660		907
661	sub URI::THAW {	908	sub URI::THAW {
662	my ($class, $serialiser, $uri) = @_;	909	my ($class, $serialiser, $uri) = @_;
663
664	$class->new ($uri)	910	$class->new ($uri)
665	}	911	}
666		912
667	Unlike C<TO_CBOR>, multiple values can be returned by C<FREEZE>. For	913	Unlike C<TO_CBOR>, multiple values can be returned by C<FREEZE>. For
668	example, a C<FREEZE> method that returns "type", "id" and "variant" values	914	example, a C<FREEZE> method that returns "type", "id" and "variant" values
…		…
799	additional tags (such as base64url).	1045	additional tags (such as base64url).
800		1046
801	=head2 ENFORCED TAGS	1047	=head2 ENFORCED TAGS
802		1048
803	These tags are always handled when decoding, and their handling cannot be	1049	These tags are always handled when decoding, and their handling cannot be
804	overriden by the user.	1050	overridden by the user.
805		1051
806	=over 4	1052	=over 4
807		1053
808	=item 26 (perl-object, L<http://cbor.schmorp.de/perl-object>)	1054	=item 26 (perl-object, L<http://cbor.schmorp.de/perl-object>)
809		1055
810	These tags are automatically created (and decoded) for serialisable	1056	These tags are automatically created (and decoded) for serialisable
811	objects using the C<FREEZE/THAW> methods (the L<Types::Serialier> object	1057	objects using the C<FREEZE/THAW> methods (the L<Types::Serialier> object
812	serialisation protocol). See L<OBJECT SERIALISATION> for details.	1058	serialisation protocol). See L<OBJECT SERIALISATION> for details.
813		1059
814	=item 28, 29 (shareable, sharedref, L <http://cbor.schmorp.de/value-sharing>)	1060	=item 28, 29 (shareable, sharedref, L<http://cbor.schmorp.de/value-sharing>)
815		1061
816	These tags are automatically decoded when encountered (and they do not	1062	These tags are automatically decoded when encountered (and they do not
817	result in a cyclic data structure, see C<allow_cycles>), resulting in	1063	result in a cyclic data structure, see C<allow_cycles>), resulting in
818	shared values in the decoded object. They are only encoded, however, when	1064	shared values in the decoded object. They are only encoded, however, when
819	C<allow_sharing> is enabled.	1065	C<allow_sharing> is enabled.
…		…
829	will be shared, others will not. While non-reference shared values can be	1075	will be shared, others will not. While non-reference shared values can be
830	generated in Perl with some effort, they were considered too unimportant	1076	generated in Perl with some effort, they were considered too unimportant
831	to be supported in the encoder. The decoder, however, will decode these	1077	to be supported in the encoder. The decoder, however, will decode these
832	values as shared values.	1078	values as shared values.
833		1079
834	=item 256, 25 (stringref-namespace, stringref, L <http://cbor.schmorp.de/stringref>)	1080	=item 256, 25 (stringref-namespace, stringref, L<http://cbor.schmorp.de/stringref>)
835		1081
836	These tags are automatically decoded when encountered. They are only	1082	These tags are automatically decoded when encountered. They are only
837	encoded, however, when C<pack_strings> is enabled.	1083	encoded, however, when C<pack_strings> is enabled.
838		1084
839	=item 22098 (indirection, L<http://cbor.schmorp.de/indirection>)	1085	=item 22098 (indirection, L<http://cbor.schmorp.de/indirection>)
840		1086
841	This tag is automatically generated when a reference are encountered (with	1087	This tag is automatically generated when a reference are encountered (with
842	the exception of hash and array refernces). It is converted to a reference	1088	the exception of hash and array references). It is converted to a reference
843	when decoding.	1089	when decoding.
844		1090
845	=item 55799 (self-describe CBOR, RFC 7049)	1091	=item 55799 (self-describe CBOR, RFC 7049)
846		1092
847	This value is not generated on encoding (unless explicitly requested by	1093	This value is not generated on encoding (unless explicitly requested by
…		…
850	=back	1096	=back
851		1097
852	=head2 NON-ENFORCED TAGS	1098	=head2 NON-ENFORCED TAGS
853		1099
854	These tags have default filters provided when decoding. Their handling can	1100	These tags have default filters provided when decoding. Their handling can
855	be overriden by changing the C<%CBOR::XS::FILTER> entry for the tag, or by	1101	be overridden by changing the C<%CBOR::XS::FILTER> entry for the tag, or by
856	providing a custom C<filter> callback when decoding.	1102	providing a custom C<filter> callback when decoding.
857		1103
858	When they result in decoding into a specific Perl class, the module	1104	When they result in decoding into a specific Perl class, the module
859	usually provides a corresponding C<TO_CBOR> method as well.	1105	usually provides a corresponding C<TO_CBOR> method as well.
860		1106
…		…
878		1124
879	These tags are decoded into L<Math::BigInt> objects. The corresponding	1125	These tags are decoded into L<Math::BigInt> objects. The corresponding
880	C<Math::BigInt::TO_CBOR> method encodes "small" bigints into normal CBOR	1126	C<Math::BigInt::TO_CBOR> method encodes "small" bigints into normal CBOR
881	integers, and others into positive/negative CBOR bignums.	1127	integers, and others into positive/negative CBOR bignums.
882		1128
883	=item 4, 5 (decimal fraction/bigfloat)	1129	=item 4, 5, 264, 265 (decimal fraction/bigfloat)
884		1130
885	Both decimal fractions and bigfloats are decoded into L<Math::BigFloat>	1131	Both decimal fractions and bigfloats are decoded into L<Math::BigFloat>
886	objects. The corresponding C<Math::BigFloat::TO_CBOR> method I<always>	1132	objects. The corresponding C<Math::BigFloat::TO_CBOR> method I<always>
887	encodes into a decimal fraction.	1133	encodes into a decimal fraction (either tag 4 or 264).
888		1134
889	CBOR cannot represent bigfloats with I<very> large exponents - conversion	1135	NaN and infinities are not encoded properly, as they cannot be represented
890	of such big float objects is undefined.	1136	in CBOR.
891		1137
892	Also, NaN and infinities are not encoded properly.	1138	See L<BIGNUM SECURITY CONSIDERATIONS> for more info.
		1139
		1140	=item 30 (rational numbers)
		1141
		1142	These tags are decoded into L<Math::BigRat> objects. The corresponding
		1143	C<Math::BigRat::TO_CBOR> method encodes rational numbers with denominator
		1144	C<1> via their numerator only, i.e., they become normal integers or
		1145	C<bignums>.
		1146
		1147	See L<BIGNUM SECURITY CONSIDERATIONS> for more info.
893		1148
894	=item 21, 22, 23 (expected later JSON conversion)	1149	=item 21, 22, 23 (expected later JSON conversion)
895		1150
896	CBOR::XS is not a CBOR-to-JSON converter, and will simply ignore these	1151	CBOR::XS is not a CBOR-to-JSON converter, and will simply ignore these
897	tags.	1152	tags.
…		…
902	C<URI::TO_CBOR> method again results in a CBOR URI value.	1157	C<URI::TO_CBOR> method again results in a CBOR URI value.
903		1158
904	=back	1159	=back
905		1160
906	=cut	1161	=cut
907
908	our %FILTER = (
909	# 0 # rfc4287 datetime, utf-8
910	# 1 # unix timestamp, any
911
912	2 => sub { # pos bigint
913	require Math::BigInt;
914	Math::BigInt->new ("0x" . unpack "H*", pop)
915	},
916
917	3 => sub { # neg bigint
918	require Math::BigInt;
919	-Math::BigInt->new ("0x" . unpack "H*", pop)
920	},
921
922	4 => sub { # decimal fraction, array
923	require Math::BigFloat;
924	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])
925	},
926
927	5 => sub { # bigfloat, array
928	require Math::BigFloat;
929	scalar Math::BigFloat->new ($_[1][1])->blsft ($_[1][0], 2)
930	},
931
932	21 => sub { pop }, # expected conversion to base64url encoding
933	22 => sub { pop }, # expected conversion to base64 encoding
934	23 => sub { pop }, # expected conversion to base16 encoding
935
936	# 24 # embedded cbor, byte string
937
938	32 => sub {
939	require URI;
940	URI->new (pop)
941	},
942
943	# 33 # base64url rfc4648, utf-8
944	# 34 # base64 rfc46484, utf-8
945	# 35 # regex pcre/ecma262, utf-8
946	# 36 # mime message rfc2045, utf-8
947	);
948
949		1162
950	=head1 CBOR and JSON	1163	=head1 CBOR and JSON
951		1164
952	CBOR is supposed to implement a superset of the JSON data model, and is,	1165	CBOR is supposed to implement a superset of the JSON data model, and is,
953	with some coercion, able to represent all JSON texts (something that other	1166	with some coercion, able to represent all JSON texts (something that other
…		…
962	CBOR intact.	1175	CBOR intact.
963		1176
964		1177
965	=head1 SECURITY CONSIDERATIONS	1178	=head1 SECURITY CONSIDERATIONS
966		1179
967	When you are using CBOR in a protocol, talking to untrusted potentially	1180	Tl;dr... if you want to decode or encode CBOR from untrusted sources, you
968	hostile creatures requires relatively few measures.	1181	should start with a coder object created via C<new_safe> (which implements
		1182	the mitigations explained below):
969		1183
		1184	my $coder = CBOR::XS->new_safe;
		1185
		1186	my $data = $coder->decode ($cbor_text);
		1187	my $cbor = $coder->encode ($data);
		1188
		1189	Longer version: When you are using CBOR in a protocol, talking to
		1190	untrusted potentially hostile creatures requires some thought:
		1191
		1192	=over 4
		1193
		1194	=item Security of the CBOR decoder itself
		1195
970	First of all, your CBOR decoder should be secure, that is, should not have	1196	First and foremost, your CBOR decoder should be secure, that is, should
		1197	not have any buffer overflows or similar bugs that could potentially be
971	any buffer overflows. Obviously, this module should ensure that and I am	1198	exploited. Obviously, this module should ensure that and I am trying hard
972	trying hard on making that true, but you never know.	1199	on making that true, but you never know.
973		1200
		1201	=item CBOR::XS can invoke almost arbitrary callbacks during decoding
		1202
		1203	CBOR::XS supports object serialisation - decoding CBOR can cause calls
		1204	to I<any> C<THAW> method in I<any> package that exists in your process
		1205	(that is, CBOR::XS will not try to load modules, but any existing C<THAW>
		1206	method or function can be called, so they all have to be secure).
		1207
		1208	Less obviously, it will also invoke C<TO_CBOR> and C<FREEZE> methods -
		1209	even if all your C<THAW> methods are secure, encoding data structures from
		1210	untrusted sources can invoke those and trigger bugs in those.
		1211
		1212	So, if you are not sure about the security of all the modules you
		1213	have loaded (you shouldn't), you should disable this part using
		1214	C<forbid_objects> or using C<new_safe>.
		1215
		1216	=item CBOR can be extended with tags that call library code
		1217
		1218	CBOR can be extended with tags, and C<CBOR::XS> has a registry of
		1219	conversion functions for many existing tags that can be extended via
		1220	third-party modules (see the C<filter> method).
		1221
		1222	If you don't trust these, you should configure the "safe" filter function,
		1223	C<CBOR::XS::safe_filter> (C<new_safe> does this), which by default only
		1224	includes conversion functions that are considered "safe" by the author
		1225	(but again, they can be extended by third party modules).
		1226
		1227	Depending on your level of paranoia, you can use the "safe" filter:
		1228
		1229	$cbor->filter (\&CBOR::XS::safe_filter);
		1230
		1231	... your own filter...
		1232
		1233	$cbor->filter (sub { ... do your stuffs here ... });
		1234
		1235	... or even no filter at all, disabling all tag decoding:
		1236
		1237	$cbor->filter (sub { });
		1238
		1239	This is never a problem for encoding, as the tag mechanism only exists in
		1240	CBOR texts.
		1241
		1242	=item Resource-starving attacks: object memory usage
		1243
974	Second, you need to avoid resource-starving attacks. That means you should	1244	You need to avoid resource-starving attacks. That means you should limit
975	limit the size of CBOR data you accept, or make sure then when your	1245	the size of CBOR data you accept, or make sure then when your resources
976	resources run out, that's just fine (e.g. by using a separate process that	1246	run out, that's just fine (e.g. by using a separate process that can
977	can crash safely). The size of a CBOR string in octets is usually a good	1247	crash safely). The size of a CBOR string in octets is usually a good
978	indication of the size of the resources required to decode it into a Perl	1248	indication of the size of the resources required to decode it into a Perl
979	structure. While CBOR::XS can check the size of the CBOR text, it might be	1249	structure. While CBOR::XS can check the size of the CBOR text (using
980	too late when you already have it in memory, so you might want to check	1250	C<max_size> - done by C<new_safe>), it might be too late when you already
981	the size before you accept the string.	1251	have it in memory, so you might want to check the size before you accept
		1252	the string.
982		1253
		1254	As for encoding, it is possible to construct data structures that are
		1255	relatively small but result in large CBOR texts (for example by having an
		1256	array full of references to the same big data structure, which will all be
		1257	deep-cloned during encoding by default). This is rarely an actual issue
		1258	(and the worst case is still just running out of memory), but you can
		1259	reduce this risk by using C<allow_sharing>.
		1260
		1261	=item Resource-starving attacks: stack overflows
		1262
983	Third, CBOR::XS recurses using the C stack when decoding objects and	1263	CBOR::XS recurses using the C stack when decoding objects and arrays. The
984	arrays. The C stack is a limited resource: for instance, on my amd64	1264	C stack is a limited resource: for instance, on my amd64 machine with 8MB
985	machine with 8MB of stack size I can decode around 180k nested arrays but	1265	of stack size I can decode around 180k nested arrays but only 14k nested
986	only 14k nested CBOR objects (due to perl itself recursing deeply on croak	1266	CBOR objects (due to perl itself recursing deeply on croak to free the
987	to free the temporary). If that is exceeded, the program crashes. To be	1267	temporary). If that is exceeded, the program crashes. To be conservative,
988	conservative, the default nesting limit is set to 512. If your process	1268	the default nesting limit is set to 512. If your process has a smaller
989	has a smaller stack, you should adjust this setting accordingly with the	1269	stack, you should adjust this setting accordingly with the C<max_depth>
990	C<max_depth> method.	1270	method.
		1271
		1272	=item Resource-starving attacks: CPU en-/decoding complexity
		1273
		1274	CBOR::XS will use the L<Math::BigInt>, L<Math::BigFloat> and
		1275	L<Math::BigRat> libraries to represent encode/decode bignums. These can be
		1276	very slow (as in, centuries of CPU time) and can even crash your program
		1277	(and are generally not very trustworthy). See the next section on bignum
		1278	security for details.
		1279
		1280	=item Data breaches: leaking information in error messages
		1281
		1282	CBOR::XS might leak contents of your Perl data structures in its error
		1283	messages, so when you serialise sensitive information you might want to
		1284	make sure that exceptions thrown by CBOR::XS will not end up in front of
		1285	untrusted eyes.
		1286
		1287	=item Something else...
991		1288
992	Something else could bomb you, too, that I forgot to think of. In that	1289	Something else could bomb you, too, that I forgot to think of. In that
993	case, you get to keep the pieces. I am always open for hints, though...	1290	case, you get to keep the pieces. I am always open for hints, though...
994		1291
995	Also keep in mind that CBOR::XS might leak contents of your Perl data	1292	=back
996	structures in its error messages, so when you serialise sensitive	1293
997	information you might want to make sure that exceptions thrown by CBOR::XS	1294
998	will not end up in front of untrusted eyes.	1295	=head1 BIGNUM SECURITY CONSIDERATIONS
		1296
		1297	CBOR::XS provides a C<TO_CBOR> method for both L<Math::BigInt> and
		1298	L<Math::BigFloat> that tries to encode the number in the simplest possible
		1299	way, that is, either a CBOR integer, a CBOR bigint/decimal fraction (tag
		1300	4) or an arbitrary-exponent decimal fraction (tag 264). Rational numbers
		1301	(L<Math::BigRat>, tag 30) can also contain bignums as members.
		1302
		1303	CBOR::XS will also understand base-2 bigfloat or arbitrary-exponent
		1304	bigfloats (tags 5 and 265), but it will never generate these on its own.
		1305
		1306	Using the built-in L<Math::BigInt::Calc> support, encoding and decoding
		1307	decimal fractions is generally fast. Decoding bigints can be slow for very
		1308	big numbers (tens of thousands of digits, something that could potentially
		1309	be caught by limiting the size of CBOR texts), and decoding bigfloats or
		1310	arbitrary-exponent bigfloats can be I<extremely> slow (minutes, decades)
		1311	for large exponents (roughly 40 bit and longer).
		1312
		1313	Additionally, L<Math::BigInt> can take advantage of other bignum
		1314	libraries, such as L<Math::GMP>, which cannot handle big floats with large
		1315	exponents, and might simply abort or crash your program, due to their code
		1316	quality.
		1317
		1318	This can be a concern if you want to parse untrusted CBOR. If it is, you
		1319	might want to disable decoding of tag 2 (bigint) and 3 (negative bigint)
		1320	types. You should also disable types 5 and 265, as these can be slow even
		1321	without bigints.
		1322
		1323	Disabling bigints will also partially or fully disable types that rely on
		1324	them, e.g. rational numbers that use bignums.
		1325
999		1326
1000	=head1 CBOR IMPLEMENTATION NOTES	1327	=head1 CBOR IMPLEMENTATION NOTES
1001		1328
1002	This section contains some random implementation notes. They do not	1329	This section contains some random implementation notes. They do not
1003	describe guaranteed behaviour, but merely behaviour as-is implemented	1330	describe guaranteed behaviour, but merely behaviour as-is implemented
…		…
1017		1344
1018		1345
1019	=head1 LIMITATIONS ON PERLS WITHOUT 64-BIT INTEGER SUPPORT	1346	=head1 LIMITATIONS ON PERLS WITHOUT 64-BIT INTEGER SUPPORT
1020		1347
1021	On perls that were built without 64 bit integer support (these are rare	1348	On perls that were built without 64 bit integer support (these are rare
1022	nowadays, even on 32 bit architectures), support for any kind of 64 bit	1349	nowadays, even on 32 bit architectures, as all major Perl distributions
		1350	are built with 64 bit integer support), support for any kind of 64 bit
1023	integer in CBOR is very limited - most likely, these 64 bit values will	1351	value in CBOR is very limited - most likely, these 64 bit values will
1024	be truncated, corrupted, or otherwise not decoded correctly. This also	1352	be truncated, corrupted, or otherwise not decoded correctly. This also
1025	includes string, array and map sizes that are stored as 64 bit integers.	1353	includes string, float, array and map sizes that are stored as 64 bit
		1354	integers.
1026		1355
1027		1356
1028	=head1 THREADS	1357	=head1 THREADS
1029		1358
1030	This module is I<not> guaranteed to be thread safe and there are no	1359	This module is I<not> guaranteed to be thread safe and there are no
…		…
1043		1372
1044	Please refrain from using rt.cpan.org or any other bug reporting	1373	Please refrain from using rt.cpan.org or any other bug reporting
1045	service. I put the contact address into my modules for a reason.	1374	service. I put the contact address into my modules for a reason.
1046		1375
1047	=cut	1376	=cut
		1377
		1378	# clumsy and slow hv_store-in-hash helper function
		1379	sub _hv_store {
		1380	$_[0]{$_[1]} = $_[2];
		1381	}
1048		1382
1049	our %FILTER = (	1383	our %FILTER = (
1050	0 => sub { # rfc4287 datetime, utf-8	1384	0 => sub { # rfc4287 datetime, utf-8
1051	require Time::Piece;	1385	require Time::Piece;
1052	# Time::Piece::Strptime uses the "incredibly flexible date parsing routine"	1386	# Time::Piece::Strptime uses the "incredibly flexible date parsing routine"
1053	# from FreeBSD, which can't parse ISO 8601, RFC3339, RFC4287 or much of anything	1387	# from FreeBSD, which can't parse ISO 8601, RFC3339, RFC4287 or much of anything
1054	# else either. Whats incredibe over standard strptime totally escapes me.	1388	# else either. Whats incredibe over standard strptime totally escapes me.
1055	# doesn't do fractional times, either. sigh.	1389	# doesn't do fractional times, either. sigh.
1056	# In fact, it's all a lie, it uses whatever strptime it wants, and of course,	1390	# In fact, it's all a lie, it uses whatever strptime it wants, and of course,
1057	# they are all incomptible. The openbsd one simply ignores %z (but according to the	1391	# they are all incompatible. The openbsd one simply ignores %z (but according to the
1058	# docs, it would be much more incredibly flexible indeed. If it worked, that is.).	1392	# docs, it would be much more incredibly flexible indeed. If it worked, that is.).
1059	scalar eval {	1393	scalar eval {
1060	my $s = $_[1];	1394	my $s = $_[1];
1061		1395
1062	$s =~ s/Z$/+00:00/;	1396	$s =~ s/Z$/+00:00/;
…		…
1088	4 => sub { # decimal fraction, array	1422	4 => sub { # decimal fraction, array
1089	require Math::BigFloat;	1423	require Math::BigFloat;
1090	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])	1424	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])
1091	},	1425	},
1092		1426
		1427	264 => sub { # decimal fraction with arbitrary exponent
		1428	require Math::BigFloat;
		1429	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])
		1430	},
		1431
1093	5 => sub { # bigfloat, array	1432	5 => sub { # bigfloat, array
1094	require Math::BigFloat;	1433	require Math::BigFloat;
1095	scalar Math::BigFloat->new ($_[1][1])->blsft ($_[1][0], 2)	1434	scalar Math::BigFloat->new ($_[1][1]) * Math::BigFloat->new (2)->bpow ($_[1][0])
		1435	},
		1436
		1437	265 => sub { # bigfloat with arbitrary exponent
		1438	require Math::BigFloat;
		1439	scalar Math::BigFloat->new ($_[1][1]) * Math::BigFloat->new (2)->bpow ($_[1][0])
		1440	},
		1441
		1442	30 => sub { # rational number
		1443	require Math::BigRat;
		1444	Math::BigRat->new ("$_[1][0]/$_[1][1]") # separate parameters only work in recent versons
1096	},	1445	},
1097		1446
1098	21 => sub { pop }, # expected conversion to base64url encoding	1447	21 => sub { pop }, # expected conversion to base64url encoding
1099	22 => sub { pop }, # expected conversion to base64 encoding	1448	22 => sub { pop }, # expected conversion to base64 encoding
1100	23 => sub { pop }, # expected conversion to base16 encoding	1449	23 => sub { pop }, # expected conversion to base16 encoding
…		…
1110	# 34 # base64 rfc46484, utf-8	1459	# 34 # base64 rfc46484, utf-8
1111	# 35 # regex pcre/ecma262, utf-8	1460	# 35 # regex pcre/ecma262, utf-8
1112	# 36 # mime message rfc2045, utf-8	1461	# 36 # mime message rfc2045, utf-8
1113	);	1462	);
1114		1463
1115	sub CBOR::XS::default_filter {	1464	sub default_filter {
1116	&{ $FILTER{$_[0]} or return }	1465	&{ $FILTER{$_[0]} or return }
		1466	}
		1467
		1468	our %SAFE_FILTER = map { $_ => $FILTER{$_} } 0, 1, 21, 22, 23, 32;
		1469
		1470	sub safe_filter {
		1471	&{ $SAFE_FILTER{$_[0]} or return }
1117	}	1472	}
1118		1473
1119	sub URI::TO_CBOR {	1474	sub URI::TO_CBOR {
1120	my $uri = $_[0]->as_string;	1475	my $uri = $_[0]->as_string;
1121	utf8::upgrade $uri;	1476	utf8::upgrade $uri;
1122	tag 32, $uri	1477	tag 32, $uri
1123	}	1478	}
1124		1479
1125	sub Math::BigInt::TO_CBOR {	1480	sub Math::BigInt::TO_CBOR {
1126	if ($_[0] >= -2147483648 && $_[0] <= 2147483647) {	1481	if (-2147483648 <= $_[0] && $_[0] <= 2147483647) {
1127	$_[0]->numify	1482	$_[0]->numify
1128	} else {	1483	} else {
1129	my $hex = substr $_[0]->as_hex, 2;	1484	my $hex = substr $_[0]->as_hex, 2;
1130	$hex = "0$hex" if 1 & length $hex; # sigh	1485	$hex = "0$hex" if 1 & length $hex; # sigh
1131	tag $_[0] >= 0 ? 2 : 3, pack "H*", $hex	1486	tag $_[0] >= 0 ? 2 : 3, pack "H*", $hex
1132	}	1487	}
1133	}	1488	}
1134		1489
1135	sub Math::BigFloat::TO_CBOR {	1490	sub Math::BigFloat::TO_CBOR {
1136	my ($m, $e) = $_[0]->parts;	1491	my ($m, $e) = $_[0]->parts;
		1492
		1493	-9223372036854775808 <= $e && $e <= 18446744073709551615
1137	tag 4, [$e->numify, $m]	1494	? tag 4, [$e->numify, $m]
		1495	: tag 264, [$e, $m]
		1496	}
		1497
		1498	sub Math::BigRat::TO_CBOR {
		1499	my ($n, $d) = $_[0]->parts;
		1500
		1501	# older versions of BigRat need *1, as they not always return numbers
		1502
		1503	$d*1 == 1
		1504	? $n*1
		1505	: tag 30, [$n1, $d1]
1138	}	1506	}
1139		1507
1140	sub Time::Piece::TO_CBOR {	1508	sub Time::Piece::TO_CBOR {
1141	tag 1, 0 + $_[0]->epoch	1509	tag 1, 0 + $_[0]->epoch
1142	}	1510	}

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Comparing CBOR-XS/XS.pm (file contents): Revision 1.40 by root, Sun Jan 5 14:24:54 2014 UTC vs. Revision 1.90 by root, Sat Nov 18 18:19:57 2023 UTC

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Comparing CBOR-XS/XS.pm (file contents):
Revision 1.40 by root, Sun Jan 5 14:24:54 2014 UTC vs.
Revision 1.90 by root, Sat Nov 18 18:19:57 2023 UTC