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Comparing CBOR-XS/XS.pm (file contents):
Revision 1.70 by root, Sat Nov 9 07:30:36 2019 UTC vs.
Revision 1.78 by root, Tue Dec 8 08:29:44 2020 UTC

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64 64
65package CBOR::XS; 65package CBOR::XS;
66 66
67use common::sense; 67use common::sense;
68 68
69our $VERSION = 1.71; 69our $VERSION = 1.83;
70our @ISA = qw(Exporter); 70our @ISA = qw(Exporter);
71 71
72our @EXPORT = qw(encode_cbor decode_cbor); 72our @EXPORT = qw(encode_cbor decode_cbor);
73 73
74use Exporter; 74use Exporter;
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330strings as CBOR byte strings. 330strings as CBOR byte strings.
331 331
332This option does not affect C<decode> in any way. 332This option does not affect C<decode> in any way.
333 333
334This option has similar advantages and disadvantages as C<text_keys>. In 334This option has similar advantages and disadvantages as C<text_keys>. In
335addition, this option effectively removes the ability to encode byte 335addition, this option effectively removes the ability to automatically
336strings, which might break some C<FREEZE> and C<TO_CBOR> methods that rely 336encode byte strings, which might break some C<FREEZE> and C<TO_CBOR>
337on this, such as bignum encoding, so this option is mainly useful for very 337methods that rely on this.
338simple data. 338
339A workaround is to use explicit type casts, which are unaffected by this option.
339 340
340=item $cbor = $cbor->validate_utf8 ([$enable]) 341=item $cbor = $cbor->validate_utf8 ([$enable])
341 342
342=item $enabled = $cbor->get_validate_utf8 343=item $enabled = $cbor->get_validate_utf8
343 344
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668 "$x"; # stringified 669 "$x"; # stringified
669 $x .= ""; # another, more awkward way to stringify 670 $x .= ""; # another, more awkward way to stringify
670 print $x; # perl does it for you, too, quite often 671 print $x; # perl does it for you, too, quite often
671 672
672You can force whether a string is encoded as byte or text string by using 673You can force whether a string is encoded as byte or text string by using
673C<utf8::upgrade> and C<utf8::downgrade> (if C<text_strings> is disabled): 674C<utf8::upgrade> and C<utf8::downgrade> (if C<text_strings> is disabled).
674 675
675 utf8::upgrade $x; # encode $x as text string 676 utf8::upgrade $x; # encode $x as text string
676 utf8::downgrade $x; # encode $x as byte string 677 utf8::downgrade $x; # encode $x as byte string
678
679More options are available, see L<TYPE CASTS>, below, and the C<text_keys>
680and C<text_strings> options.
677 681
678Perl doesn't define what operations up- and downgrade strings, so if the 682Perl doesn't define what operations up- and downgrade strings, so if the
679difference between byte and text is important, you should up- or downgrade 683difference between byte and text is important, you should up- or downgrade
680your string as late as possible before encoding. You can also force the 684your string as late as possible before encoding. You can also force the
681use of CBOR text strings by using C<text_keys> or C<text_strings>. 685use of CBOR text strings by using C<text_keys> or C<text_strings>.
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696format will be used. Perls that use formats other than IEEE double to 700format will be used. Perls that use formats other than IEEE double to
697represent numerical values are supported, but might suffer loss of 701represent numerical values are supported, but might suffer loss of
698precision. 702precision.
699 703
700=back 704=back
705
706=head2 TYPE CASTS
707
708B<EXPERIMENTAL>: As an experimental extension, C<CBOR::XS> allows you to
709force specific cbor types to be used when encoding. That allows you to
710encode types not normally accessible (e.g. half floats) as well as force
711string types even when C<text_strings> is in effect.
712
713Type forcing is done by calling a special "cast" function which keeps a
714copy of the value and returns a new value that can be handed over to any
715CBOR encoder function.
716
717The following casts are currently available (all of which are unary operators):
718
719=over
720
721=item CBOR::XS::as_int $value
722
723Forces the value to be encoded as some form of (basic, not bignum) integer
724type.
725
726=item CBOR::XS::as_text $value
727
728Forces the value to be encoded as (UTF-8) text values.
729
730=item CBOR::XS::as_bytes $value
731
732Forces the value to be encoded as a (binary) string value.
733
734Example: encode a perl string as binary even though C<text_strings> is in
735effect.
736
737 CBOR::XS->new->text_strings->encode ([4, "text", CBOR::XS::bytes "bytevalue"]);
738
739=item CBOR::XS::as_bool $value
740
741Converts a Perl boolean (which can be any kind of scalar) into a CBOR
742boolean. Strictly the same, but shorter to write, than:
743
744 $value ? Types::Serialiser::true : Types::Serialiser::false
745
746=item CBOR::XS::as_float16 $value
747
748Forces half-float (IEEE 754 binary16) encoding of the given value.
749
750=item CBOR::XS::as_float32 $value
751
752Forces single-float (IEEE 754 binary32) encoding of the given value.
753
754=item CBOR::XS::as_float64 $value
755
756Forces double-float (IEEE 754 binary64) encoding of the given value.
757
758=item CBOR::XS::as_cbor $cbor_text
759
760Not a type cast per-se, this type cast forces the argument to eb encoded
761as-is. This can be used to embed pre-encoded CBOR data.
762
763Note that no checking on the validity of the C<$cbor_text> is done - it's
764the callers responsibility to correctly encode values.
765
766=item CBOR::XS::as_map [key => value...]
767
768Treat the array reference as key value pairs and output a CBOR map. This
769allows you to generate CBOR maps with arbitrary key types (or, if you
770don't care about semantics, duplicate keys or prairs in a custom order),
771which is otherwise hard to do with Perl.
772
773The single argument must be an array reference with an even number of
774elements.
775
776Example: encode a CBOR map with a string and an integer as keys.
777
778 encode_cbor CBOR::XS::as_map [string => "value", 5 => "value"]
779
780=back
781
782=cut
783
784sub CBOR::XS::as_cbor ($) { bless [$_[0], 0, undef], CBOR::XS::Tagged:: }
785sub CBOR::XS::as_int ($) { bless [$_[0], 1, undef], CBOR::XS::Tagged:: }
786sub CBOR::XS::as_bytes ($) { bless [$_[0], 2, undef], CBOR::XS::Tagged:: }
787sub CBOR::XS::as_text ($) { bless [$_[0], 3, undef], CBOR::XS::Tagged:: }
788sub CBOR::XS::as_float16 ($) { bless [$_[0], 4, undef], CBOR::XS::Tagged:: }
789sub CBOR::XS::as_float32 ($) { bless [$_[0], 5, undef], CBOR::XS::Tagged:: }
790sub CBOR::XS::as_float64 ($) { bless [$_[0], 6, undef], CBOR::XS::Tagged:: }
791
792sub CBOR::XS::as_bool ($) { $_[0] ? $Types::Serialiser::true : $Types::Serialiser::false }
793
794sub CBOR::XS::as_map ($) {
795 ARRAY:: eq ref $_[0]
796 and $#{ $_[0] } & 1
797 or do { require Carp; Carp::croak ("CBOR::XS::as_map only acepts array references with an even number of elements, caught") };
798
799 bless [$_[0], 7, undef], CBOR::XS::Tagged::
800}
701 801
702=head2 OBJECT SERIALISATION 802=head2 OBJECT SERIALISATION
703 803
704This module implements both a CBOR-specific and the generic 804This module implements both a CBOR-specific and the generic
705L<Types::Serialier> object serialisation protocol. The following 805L<Types::Serialier> object serialisation protocol. The following
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1228=head1 LIMITATIONS ON PERLS WITHOUT 64-BIT INTEGER SUPPORT 1328=head1 LIMITATIONS ON PERLS WITHOUT 64-BIT INTEGER SUPPORT
1229 1329
1230On perls that were built without 64 bit integer support (these are rare 1330On perls that were built without 64 bit integer support (these are rare
1231nowadays, even on 32 bit architectures, as all major Perl distributions 1331nowadays, even on 32 bit architectures, as all major Perl distributions
1232are built with 64 bit integer support), support for any kind of 64 bit 1332are built with 64 bit integer support), support for any kind of 64 bit
1233integer in CBOR is very limited - most likely, these 64 bit values will 1333value in CBOR is very limited - most likely, these 64 bit values will
1234be truncated, corrupted, or otherwise not decoded correctly. This also 1334be truncated, corrupted, or otherwise not decoded correctly. This also
1235includes string, array and map sizes that are stored as 64 bit integers. 1335includes string, float, array and map sizes that are stored as 64 bit
1336integers.
1236 1337
1237 1338
1238=head1 THREADS 1339=head1 THREADS
1239 1340
1240This module is I<not> guaranteed to be thread safe and there are no 1341This module is I<not> guaranteed to be thread safe and there are no

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