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

Comparing CBOR-XS/XS.pm (file contents):
Revision 1.52 by root, Mon Apr 25 18:17:17 2016 UTC vs.
Revision 1.67 by root, Thu Nov 15 19:52:41 2018 UTC

…		…
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 = 1.41;	69	our $VERSION = 1.71;
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	->forbid_objects
		127	->filter (\&CBOR::XS::safe_filter)
		128	->max_size (1e8);
		129
		130	But is more future proof (it is better to crash because of a change than
		131	to be exploited in other ways).
		132
		133	=cut
		134
		135	sub new_safe {
		136	CBOR::XS
		137	->new
		138	->forbid_objects
		139	->filter (\&CBOR::XS::safe_filter)
		140	->max_size (1e8)
		141	}
117		142
118	=item $cbor = $cbor->max_depth ([$maximum_nesting_depth])	143	=item $cbor = $cbor->max_depth ([$maximum_nesting_depth])
119		144
120	=item $max_depth = $cbor->get_max_depth	145	=item $max_depth = $cbor->get_max_depth
121		146
…		…
137		162
138	Note that nesting is implemented by recursion in C. The default value has	163	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	164	been chosen to be as large as typical operating systems allow without
140	crashing.	165	crashing.
141		166
142	See SECURITY CONSIDERATIONS, below, for more info on why this is useful.	167	See L<SECURITY CONSIDERATIONS>, below, for more info on why this is useful.
143		168
144	=item $cbor = $cbor->max_size ([$maximum_string_size])	169	=item $cbor = $cbor->max_size ([$maximum_string_size])
145		170
146	=item $max_size = $cbor->get_max_size	171	=item $max_size = $cbor->get_max_size
147		172
…		…
152	effect on C<encode> (yet).	177	effect on C<encode> (yet).
153		178
154	If no argument is given, the limit check will be deactivated (same as when	179	If no argument is given, the limit check will be deactivated (same as when
155	C<0> is specified).	180	C<0> is specified).
156		181
157	See SECURITY CONSIDERATIONS, below, for more info on why this is useful.	182	See L<SECURITY CONSIDERATIONS>, below, for more info on why this is useful.
158		183
159	=item $cbor = $cbor->allow_unknown ([$enable])	184	=item $cbor = $cbor->allow_unknown ([$enable])
160		185
161	=item $enabled = $cbor->get_allow_unknown	186	=item $enabled = $cbor->get_allow_unknown
162		187
…		…
180	reference to the earlier value.	205	reference to the earlier value.
181		206
182	This means that such values will only be encoded once, and will not result	207	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	208	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	209	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	210	structures (which need C<allow_cycles> to be enabled to be decoded by this
186	module).	211	module).
187		212
188	It is recommended to leave it off unless you know your	213	It is recommended to leave it off unless you know your
189	communication partner supports the value sharing extensions to CBOR	214	communication partner supports the value sharing extensions to CBOR
190	(L<http://cbor.schmorp.de/value-sharing>), as without decoder support, the	215	(L<http://cbor.schmorp.de/value-sharing>), as without decoder support, the
…		…
226	throwing an error.	251	throwing an error.
227		252
228	This option does not affect C<encode> in any way - shared values and	253	This option does not affect C<encode> in any way - shared values and
229	references will always be encoded properly if present.	254	references will always be encoded properly if present.
230		255
		256	=item $cbor = $cbor->forbid_objects ([$enable])
		257
		258	=item $enabled = $cbor->get_forbid_objects
		259
		260	Disables the use of the object serialiser protocol.
		261
		262	If C<$enable> is true (or missing), then C<encode> will will throw an
		263	exception when it encounters perl objects that would be encoded using the
		264	perl-object tag (26). When C<decode> encounters such tags, it will fall
		265	back to the general filter/tagged logic as if this were an unknown tag (by
		266	default resulting in a C<CBOR::XC::Tagged> object).
		267
		268	If C<$enable> is false (the default), then C<encode> will use the
		269	L<Types::Serialiser> object serialisation protocol to serialise objects
		270	into perl-object tags, and C<decode> will do the same to decode such tags.
		271
		272	See L<SECURITY CONSIDERATIONS>, below, for more info on why forbidding this
		273	protocol can be useful.
		274
231	=item $cbor = $cbor->pack_strings ([$enable])	275	=item $cbor = $cbor->pack_strings ([$enable])
232		276
233	=item $enabled = $cbor->get_pack_strings	277	=item $enabled = $cbor->get_pack_strings
234		278
235	If C<$enable> is true (or missing), then C<encode> will try not to encode	279	If C<$enable> is true (or missing), then C<encode> will try not to encode
…		…
337	replace the tagged value in the decoded data structure, or no values,	381	replace the tagged value in the decoded data structure, or no values,
338	which will result in default handling, which currently means the decoder	382	which will result in default handling, which currently means the decoder
339	creates a C<CBOR::XS::Tagged> object to hold the tag and the value.	383	creates a C<CBOR::XS::Tagged> object to hold the tag and the value.
340		384
341	When the filter is cleared (the default state), the default filter	385	When the filter is cleared (the default state), the default filter
342	function, C<CBOR::XS::default_filter>, is used. This function simply looks	386	function, C<CBOR::XS::default_filter>, is used. This function simply
343	up the tag in the C<%CBOR::XS::FILTER> hash. If an entry exists it must be	387	looks up the tag in the C<%CBOR::XS::FILTER> hash. If an entry exists
344	a code reference that is called with tag and value, and is responsible for	388	it must be a code reference that is called with tag and value, and is
345	decoding the value. If no entry exists, it returns no values.	389	responsible for decoding the value. If no entry exists, it returns no
		390	values. C<CBOR::XS> provides a number of default filter functions already,
		391	the the C<%CBOR::XS::FILTER> hash can be freely extended with more.
		392
		393	C<CBOR::XS> additionally provides an alternative filter function that is
		394	supposed to be safe to use with untrusted data (which the default filter
		395	might not), called C<CBOR::XS::safe_filter>, which works the same as
		396	the C<default_filter> but uses the C<%CBOR::XS::SAFE_FILTER> variable
		397	instead. It is prepopulated with the tag decoding functions that are
		398	deemed safe (basically the same as C<%CBOR::XS::FILTER> without all
		399	the bignum tags), and can be extended by user code as wlel, although,
		400	obviously, one should be very careful about adding decoding functions
		401	here, since the expectation is that they are safe to use on untrusted
		402	data, after all.
346		403
347	Example: decode all tags not handled internally into C<CBOR::XS::Tagged>	404	Example: decode all tags not handled internally into C<CBOR::XS::Tagged>
348	objects, with no other special handling (useful when working with	405	objects, with no other special handling (useful when working with
349	potentially "unsafe" CBOR data).	406	potentially "unsafe" CBOR data).
350		407
…		…
356	$CBOR::XS::FILTER{1347375694} = sub {	413	$CBOR::XS::FILTER{1347375694} = sub {
357	my ($tag, $value);	414	my ($tag, $value);
358		415
359	"tag 1347375694 value $value"	416	"tag 1347375694 value $value"
360	};	417	};
		418
		419	Example: provide your own filter function that looks up tags in your own
		420	hash:
		421
		422	my %my_filter = (
		423	998347484 => sub {
		424	my ($tag, $value);
		425
		426	"tag 998347484 value $value"
		427	};
		428	);
		429
		430	my $coder = CBOR::XS->new->filter (sub {
		431	&{ $my_filter{$_[0]} or return }
		432	});
		433
		434
		435	Example: use the safe filter function (see L<SECURITY CONSIDERATIONS> for
		436	more considerations on security).
		437
		438	CBOR::XS->new->filter (\&CBOR::XS::safe_filter)->decode ($cbor_data);
361		439
362	=item $cbor_data = $cbor->encode ($perl_scalar)	440	=item $cbor_data = $cbor->encode ($perl_scalar)
363		441
364	Converts the given Perl data structure (a scalar value) to its CBOR	442	Converts the given Perl data structure (a scalar value) to its CBOR
365	representation.	443	representation.
…		…
440		518
441	Resets the incremental decoder. This throws away any saved state, so that	519	Resets the incremental decoder. This throws away any saved state, so that
442	subsequent calls to C<incr_parse> or C<incr_parse_multiple> start to parse	520	subsequent calls to C<incr_parse> or C<incr_parse_multiple> start to parse
443	a new CBOR value from the beginning of the C<$buffer> again.	521	a new CBOR value from the beginning of the C<$buffer> again.
444		522
445	This method can be caled at any time, but it I<must> be called if you want	523	This method can be called at any time, but it I<must> be called if you want
446	to change your C<$buffer> or there was a decoding error and you want to	524	to change your C<$buffer> or there was a decoding error and you want to
447	reuse the C<$cbor> object for future incremental parsings.	525	reuse the C<$cbor> object for future incremental parsings.
448		526
449	=back	527	=back
450		528
…		…
588	my $x = 3.1; # some variable containing a number	666	my $x = 3.1; # some variable containing a number
589	"$x"; # stringified	667	"$x"; # stringified
590	$x .= ""; # another, more awkward way to stringify	668	$x .= ""; # another, more awkward way to stringify
591	print $x; # perl does it for you, too, quite often	669	print $x; # perl does it for you, too, quite often
592		670
593	You can force whether a string ie encoded as byte or text string by using	671	You can force whether a string is encoded as byte or text string by using
594	C<utf8::upgrade> and C<utf8::downgrade>):	672	C<utf8::upgrade> and C<utf8::downgrade> (if C<text_strings> is disabled):
595		673
596	utf8::upgrade $x; # encode $x as text string	674	utf8::upgrade $x; # encode $x as text string
597	utf8::downgrade $x; # encode $x as byte string	675	utf8::downgrade $x; # encode $x as byte string
598		676
599	Perl doesn't define what operations up- and downgrade strings, so if the	677	Perl doesn't define what operations up- and downgrade strings, so if the
600	difference between byte and text is important, you should up- or downgrade	678	difference between byte and text is important, you should up- or downgrade
601	your string as late as possible before encoding.	679	your string as late as possible before encoding. You can also force the
		680	use of CBOR text strings by using C<text_keys> or C<text_strings>.
602		681
603	You can force the type to be a CBOR number by numifying it:	682	You can force the type to be a CBOR number by numifying it:
604		683
605	my $x = "3"; # some variable containing a string	684	my $x = "3"; # some variable containing a string
606	$x += 0; # numify it, ensuring it will be dumped as a number	685	$x += 0; # numify it, ensuring it will be dumped as a number
…		…
926		1005
927	These tags are decoded into L<Math::BigInt> objects. The corresponding	1006	These tags are decoded into L<Math::BigInt> objects. The corresponding
928	C<Math::BigInt::TO_CBOR> method encodes "small" bigints into normal CBOR	1007	C<Math::BigInt::TO_CBOR> method encodes "small" bigints into normal CBOR
929	integers, and others into positive/negative CBOR bignums.	1008	integers, and others into positive/negative CBOR bignums.
930		1009
931	=item 4, 5 (decimal fraction/bigfloat)	1010	=item 4, 5, 264, 265 (decimal fraction/bigfloat)
932		1011
933	Both decimal fractions and bigfloats are decoded into L<Math::BigFloat>	1012	Both decimal fractions and bigfloats are decoded into L<Math::BigFloat>
934	objects. The corresponding C<Math::BigFloat::TO_CBOR> method I<always>	1013	objects. The corresponding C<Math::BigFloat::TO_CBOR> method I<always>
935	encodes into a decimal fraction.	1014	encodes into a decimal fraction (either tag 4 or 264).
936		1015
937	CBOR cannot represent bigfloats with I<very> large exponents - conversion	1016	NaN and infinities are not encoded properly, as they cannot be represented
938	of such big float objects is undefined.	1017	in CBOR.
939		1018
940	Also, NaN and infinities are not encoded properly.	1019	See L<BIGNUM SECURITY CONSIDERATIONS> for more info.
		1020
		1021	=item 30 (rational numbers)
		1022
		1023	These tags are decoded into L<Math::BigRat> objects. The corresponding
		1024	C<Math::BigRat::TO_CBOR> method encodes rational numbers with denominator
		1025	C<1> via their numerator only, i.e., they become normal integers or
		1026	C<bignums>.
		1027
		1028	See L<BIGNUM SECURITY CONSIDERATIONS> for more info.
941		1029
942	=item 21, 22, 23 (expected later JSON conversion)	1030	=item 21, 22, 23 (expected later JSON conversion)
943		1031
944	CBOR::XS is not a CBOR-to-JSON converter, and will simply ignore these	1032	CBOR::XS is not a CBOR-to-JSON converter, and will simply ignore these
945	tags.	1033	tags.
…		…
968	CBOR intact.	1056	CBOR intact.
969		1057
970		1058
971	=head1 SECURITY CONSIDERATIONS	1059	=head1 SECURITY CONSIDERATIONS
972		1060
973	When you are using CBOR in a protocol, talking to untrusted potentially	1061	Tl;dr... if you want to decode or encode CBOR from untrusted sources, you
974	hostile creatures requires relatively few measures.	1062	should start with a coder object created via C<new_safe>:
975		1063
		1064	my $coder = CBOR::XS->new_safe;
		1065
		1066	my $data = $coder->decode ($cbor_text);
		1067	my $cbor = $coder->encode ($data);
		1068
		1069	Longer version: When you are using CBOR in a protocol, talking to
		1070	untrusted potentially hostile creatures requires some thought:
		1071
		1072	=over 4
		1073
		1074	=item Security of the CBOR decoder itself
		1075
976	First of all, your CBOR decoder should be secure, that is, should not have	1076	First and foremost, your CBOR decoder should be secure, that is, should
		1077	not have any buffer overflows or similar bugs that could potentially be
977	any buffer overflows. Obviously, this module should ensure that and I am	1078	exploited. Obviously, this module should ensure that and I am trying hard
978	trying hard on making that true, but you never know.	1079	on making that true, but you never know.
979		1080
		1081	=item CBOR::XS can invoke almost arbitrary callbacks during decoding
		1082
		1083	CBOR::XS supports object serialisation - decoding CBOR can cause calls
		1084	to I<any> C<THAW> method in I<any> package that exists in your process
		1085	(that is, CBOR::XS will not try to load modules, but any existing C<THAW>
		1086	method or function can be called, so they all have to be secure).
		1087
		1088	Less obviously, it will also invoke C<TO_CBOR> and C<FREEZE> methods -
		1089	even if all your C<THAW> methods are secure, encoding data structures from
		1090	untrusted sources can invoke those and trigger bugs in those.
		1091
		1092	So, if you are not sure about the security of all the modules you
		1093	have loaded (you shouldn't), you should disable this part using
		1094	C<forbid_objects>.
		1095
		1096	=item CBOR can be extended with tags that call library code
		1097
		1098	CBOR can be extended with tags, and C<CBOR::XS> has a registry of
		1099	conversion functions for many existing tags that can be extended via
		1100	third-party modules (see the C<filter> method).
		1101
		1102	If you don't trust these, you should configure the "safe" filter function,
		1103	C<CBOR::XS::safe_filter>, which by default only includes conversion
		1104	functions that are considered "safe" by the author (but again, they can be
		1105	extended by third party modules).
		1106
		1107	Depending on your level of paranoia, you can use the "safe" filter:
		1108
		1109	$cbor->filter (\&CBOR::XS::safe_filter);
		1110
		1111	... your own filter...
		1112
		1113	$cbor->filter (sub { ... do your stuffs here ... });
		1114
		1115	... or even no filter at all, disabling all tag decoding:
		1116
		1117	$cbor->filter (sub { });
		1118
		1119	This is never a problem for encoding, as the tag mechanism only exists in
		1120	CBOR texts.
		1121
		1122	=item Resource-starving attacks: object memory usage
		1123
980	Second, you need to avoid resource-starving attacks. That means you should	1124	You need to avoid resource-starving attacks. That means you should limit
981	limit the size of CBOR data you accept, or make sure then when your	1125	the size of CBOR data you accept, or make sure then when your resources
982	resources run out, that's just fine (e.g. by using a separate process that	1126	run out, that's just fine (e.g. by using a separate process that can
983	can crash safely). The size of a CBOR string in octets is usually a good	1127	crash safely). The size of a CBOR string in octets is usually a good
984	indication of the size of the resources required to decode it into a Perl	1128	indication of the size of the resources required to decode it into a Perl
985	structure. While CBOR::XS can check the size of the CBOR text, it might be	1129	structure. While CBOR::XS can check the size of the CBOR text (using
986	too late when you already have it in memory, so you might want to check	1130	C<max_size>), it might be too late when you already have it in memory, so
987	the size before you accept the string.	1131	you might want to check the size before you accept the string.
988		1132
		1133	As for encoding, it is possible to construct data structures that are
		1134	relatively small but result in large CBOR texts (for example by having an
		1135	array full of references to the same big data structure, which will all be
		1136	deep-cloned during encoding by default). This is rarely an actual issue
		1137	(and the worst case is still just running out of memory), but you can
		1138	reduce this risk by using C<allow_sharing>.
		1139
		1140	=item Resource-starving attacks: stack overflows
		1141
989	Third, CBOR::XS recurses using the C stack when decoding objects and	1142	CBOR::XS recurses using the C stack when decoding objects and arrays. The
990	arrays. The C stack is a limited resource: for instance, on my amd64	1143	C stack is a limited resource: for instance, on my amd64 machine with 8MB
991	machine with 8MB of stack size I can decode around 180k nested arrays but	1144	of stack size I can decode around 180k nested arrays but only 14k nested
992	only 14k nested CBOR objects (due to perl itself recursing deeply on croak	1145	CBOR objects (due to perl itself recursing deeply on croak to free the
993	to free the temporary). If that is exceeded, the program crashes. To be	1146	temporary). If that is exceeded, the program crashes. To be conservative,
994	conservative, the default nesting limit is set to 512. If your process	1147	the default nesting limit is set to 512. If your process has a smaller
995	has a smaller stack, you should adjust this setting accordingly with the	1148	stack, you should adjust this setting accordingly with the C<max_depth>
996	C<max_depth> method.	1149	method.
		1150
		1151	=item Resource-starving attacks: CPU en-/decoding complexity
		1152
		1153	CBOR::XS will use the L<Math::BigInt>, L<Math::BigFloat> and
		1154	L<Math::BigRat> libraries to represent encode/decode bignums. These can
		1155	be very slow (as in, centuries of CPU time) and can even crash your
		1156	program (and are generally not very trustworthy). See the next section for
		1157	details.
		1158
		1159	=item Data breaches: leaking information in error messages
		1160
		1161	CBOR::XS might leak contents of your Perl data structures in its error
		1162	messages, so when you serialise sensitive information you might want to
		1163	make sure that exceptions thrown by CBOR::XS will not end up in front of
		1164	untrusted eyes.
		1165
		1166	=item Something else...
997		1167
998	Something else could bomb you, too, that I forgot to think of. In that	1168	Something else could bomb you, too, that I forgot to think of. In that
999	case, you get to keep the pieces. I am always open for hints, though...	1169	case, you get to keep the pieces. I am always open for hints, though...
1000		1170
1001	Also keep in mind that CBOR::XS might leak contents of your Perl data	1171	=back
1002	structures in its error messages, so when you serialise sensitive	1172
1003	information you might want to make sure that exceptions thrown by CBOR::XS	1173
1004	will not end up in front of untrusted eyes.	1174	=head1 BIGNUM SECURITY CONSIDERATIONS
		1175
		1176	CBOR::XS provides a C<TO_CBOR> method for both L<Math::BigInt> and
		1177	L<Math::BigFloat> that tries to encode the number in the simplest possible
		1178	way, that is, either a CBOR integer, a CBOR bigint/decimal fraction (tag
		1179	4) or an arbitrary-exponent decimal fraction (tag 264). Rational numbers
		1180	(L<Math::BigRat>, tag 30) can also contain bignums as members.
		1181
		1182	CBOR::XS will also understand base-2 bigfloat or arbitrary-exponent
		1183	bigfloats (tags 5 and 265), but it will never generate these on its own.
		1184
		1185	Using the built-in L<Math::BigInt::Calc> support, encoding and decoding
		1186	decimal fractions is generally fast. Decoding bigints can be slow for very
		1187	big numbers (tens of thousands of digits, something that could potentially
		1188	be caught by limiting the size of CBOR texts), and decoding bigfloats or
		1189	arbitrary-exponent bigfloats can be I<extremely> slow (minutes, decades)
		1190	for large exponents (roughly 40 bit and longer).
		1191
		1192	Additionally, L<Math::BigInt> can take advantage of other bignum
		1193	libraries, such as L<Math::GMP>, which cannot handle big floats with large
		1194	exponents, and might simply abort or crash your program, due to their code
		1195	quality.
		1196
		1197	This can be a concern if you want to parse untrusted CBOR. If it is, you
		1198	might want to disable decoding of tag 2 (bigint) and 3 (negative bigint)
		1199	types. You should also disable types 5 and 265, as these can be slow even
		1200	without bigints.
		1201
		1202	Disabling bigints will also partially or fully disable types that rely on
		1203	them, e.g. rational numbers that use bignums.
		1204
1005		1205
1006	=head1 CBOR IMPLEMENTATION NOTES	1206	=head1 CBOR IMPLEMENTATION NOTES
1007		1207
1008	This section contains some random implementation notes. They do not	1208	This section contains some random implementation notes. They do not
1009	describe guaranteed behaviour, but merely behaviour as-is implemented	1209	describe guaranteed behaviour, but merely behaviour as-is implemented
…		…
1050		1250
1051	Please refrain from using rt.cpan.org or any other bug reporting	1251	Please refrain from using rt.cpan.org or any other bug reporting
1052	service. I put the contact address into my modules for a reason.	1252	service. I put the contact address into my modules for a reason.
1053		1253
1054	=cut	1254	=cut
		1255
		1256	# clumsy and slow hv_store-in-hash helper function
		1257	sub _hv_store {
		1258	$_[0]{$_[1]} = $_[2];
		1259	}
1055		1260
1056	our %FILTER = (	1261	our %FILTER = (
1057	0 => sub { # rfc4287 datetime, utf-8	1262	0 => sub { # rfc4287 datetime, utf-8
1058	require Time::Piece;	1263	require Time::Piece;
1059	# Time::Piece::Strptime uses the "incredibly flexible date parsing routine"	1264	# Time::Piece::Strptime uses the "incredibly flexible date parsing routine"
…		…
1095	4 => sub { # decimal fraction, array	1300	4 => sub { # decimal fraction, array
1096	require Math::BigFloat;	1301	require Math::BigFloat;
1097	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])	1302	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])
1098	},	1303	},
1099		1304
		1305	264 => sub { # decimal fraction with arbitrary exponent
		1306	require Math::BigFloat;
		1307	Math::BigFloat->new ($_[1][1] . "E" . $_[1][0])
		1308	},
		1309
1100	5 => sub { # bigfloat, array	1310	5 => sub { # bigfloat, array
1101	require Math::BigFloat;	1311	require Math::BigFloat;
1102	scalar Math::BigFloat->new ($_[1][1]) * Math::BigFloat->new (2)->bpow ($_[1][0])	1312	scalar Math::BigFloat->new ($_[1][1]) * Math::BigFloat->new (2)->bpow ($_[1][0])
		1313	},
		1314
		1315	265 => sub { # bigfloat with arbitrary exponent
		1316	require Math::BigFloat;
		1317	scalar Math::BigFloat->new ($_[1][1]) * Math::BigFloat->new (2)->bpow ($_[1][0])
		1318	},
		1319
		1320	30 => sub { # rational number
		1321	require Math::BigRat;
		1322	Math::BigRat->new ("$_[1][0]/$_[1][1]") # separate parameters only work in recent versons
1103	},	1323	},
1104		1324
1105	21 => sub { pop }, # expected conversion to base64url encoding	1325	21 => sub { pop }, # expected conversion to base64url encoding
1106	22 => sub { pop }, # expected conversion to base64 encoding	1326	22 => sub { pop }, # expected conversion to base64 encoding
1107	23 => sub { pop }, # expected conversion to base16 encoding	1327	23 => sub { pop }, # expected conversion to base16 encoding
…		…
1117	# 34 # base64 rfc46484, utf-8	1337	# 34 # base64 rfc46484, utf-8
1118	# 35 # regex pcre/ecma262, utf-8	1338	# 35 # regex pcre/ecma262, utf-8
1119	# 36 # mime message rfc2045, utf-8	1339	# 36 # mime message rfc2045, utf-8
1120	);	1340	);
1121		1341
1122	sub CBOR::XS::default_filter {	1342	sub default_filter {
1123	&{ $FILTER{$_[0]} or return }	1343	&{ $FILTER{$_[0]} or return }
		1344	}
		1345
		1346	our %SAFE_FILTER = map { $_ => $FILTER{$_} } 0, 1, 21, 22, 23, 32;
		1347
		1348	sub safe_filter {
		1349	&{ $SAFE_FILTER{$_[0]} or return }
1124	}	1350	}
1125		1351
1126	sub URI::TO_CBOR {	1352	sub URI::TO_CBOR {
1127	my $uri = $_[0]->as_string;	1353	my $uri = $_[0]->as_string;
1128	utf8::upgrade $uri;	1354	utf8::upgrade $uri;
1129	tag 32, $uri	1355	tag 32, $uri
1130	}	1356	}
1131		1357
1132	sub Math::BigInt::TO_CBOR {	1358	sub Math::BigInt::TO_CBOR {
1133	if ($_[0] >= -2147483648 && $_[0] <= 2147483647) {	1359	if (-2147483648 <= $_[0] && $_[0] <= 2147483647) {
1134	$_[0]->numify	1360	$_[0]->numify
1135	} else {	1361	} else {
1136	my $hex = substr $_[0]->as_hex, 2;	1362	my $hex = substr $_[0]->as_hex, 2;
1137	$hex = "0$hex" if 1 & length $hex; # sigh	1363	$hex = "0$hex" if 1 & length $hex; # sigh
1138	tag $_[0] >= 0 ? 2 : 3, pack "H*", $hex	1364	tag $_[0] >= 0 ? 2 : 3, pack "H*", $hex
1139	}	1365	}
1140	}	1366	}
1141		1367
1142	sub Math::BigFloat::TO_CBOR {	1368	sub Math::BigFloat::TO_CBOR {
1143	my ($m, $e) = $_[0]->parts;	1369	my ($m, $e) = $_[0]->parts;
		1370
		1371	-9223372036854775808 <= $e && $e <= 18446744073709551615
1144	tag 4, [$e->numify, $m]	1372	? tag 4, [$e->numify, $m]
		1373	: tag 264, [$e, $m]
		1374	}
		1375
		1376	sub Math::BigRat::TO_CBOR {
		1377	my ($n, $d) = $_[0]->parts;
		1378
		1379	# older versions of BigRat need *1, as they not always return numbers
		1380
		1381	$d*1 == 1
		1382	? $n*1
		1383	: tag 30, [$n1, $d1]
1145	}	1384	}
1146		1385
1147	sub Time::Piece::TO_CBOR {	1386	sub Time::Piece::TO_CBOR {
1148	tag 1, 0 + $_[0]->epoch	1387	tag 1, 0 + $_[0]->epoch
1149	}	1388	}

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Comparing CBOR-XS/XS.pm (file contents): Revision 1.52 by root, Mon Apr 25 18:17:17 2016 UTC vs. Revision 1.67 by root, Thu Nov 15 19:52:41 2018 UTC

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Comparing CBOR-XS/XS.pm (file contents):
Revision 1.52 by root, Mon Apr 25 18:17:17 2016 UTC vs.
Revision 1.67 by root, Thu Nov 15 19:52:41 2018 UTC