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46 | In short, CBOR is a faster and very compact binary alternative to JSON, |
46 | In short, CBOR is a faster and very compact binary alternative to JSON, |
47 | with the added ability of supporting serialisation of Perl objects. (JSON |
47 | with the added ability of supporting serialisation of Perl objects. (JSON |
48 | often compresses better than CBOR though, so if you plan to compress the |
48 | often compresses better than CBOR though, so if you plan to compress the |
49 | data later you might want to compare both formats first). |
49 | data later you might want to compare both formats first). |
50 | |
50 | |
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51 | To give you a general idea, with texts in the megabyte range, C<CBOR::XS> |
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52 | usually encodes roughly twice as fast as L<Storable> or L<JSON::XS> and |
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53 | decodes about 15%-30% faster than those. The shorter the data, the worse |
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54 | L<Storable> performs in comparison. |
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55 | |
51 | The primary goal of this module is to be I<correct> and the secondary goal |
56 | The primary goal of this module is to be I<correct> and the secondary goal |
52 | is to be I<fast>. To reach the latter goal it was written in C. |
57 | is to be I<fast>. To reach the latter goal it was written in C. |
53 | |
58 | |
54 | See MAPPING, below, on how CBOR::XS maps perl values to CBOR values and |
59 | See MAPPING, below, on how CBOR::XS maps perl values to CBOR values and |
55 | vice versa. |
60 | vice versa. |
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58 | |
63 | |
59 | package CBOR::XS; |
64 | package CBOR::XS; |
60 | |
65 | |
61 | use common::sense; |
66 | use common::sense; |
62 | |
67 | |
63 | our $VERSION = 0.05; |
68 | our $VERSION = 0.06; |
64 | our @ISA = qw(Exporter); |
69 | our @ISA = qw(Exporter); |
65 | |
70 | |
66 | our @EXPORT = qw(encode_cbor decode_cbor); |
71 | our @EXPORT = qw(encode_cbor decode_cbor); |
67 | |
72 | |
68 | use Exporter; |
73 | use Exporter; |
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283 | C<1>, which get turned into false and true in CBOR. |
288 | C<1>, which get turned into false and true in CBOR. |
284 | |
289 | |
285 | =item CBOR::XS::Tagged objects |
290 | =item CBOR::XS::Tagged objects |
286 | |
291 | |
287 | Objects of this type must be arrays consisting of a single C<[tag, value]> |
292 | Objects of this type must be arrays consisting of a single C<[tag, value]> |
288 | pair. The (numerical) tag will be encoded as a CBOR tag, the value will be |
293 | pair. The (numerical) tag will be encoded as a CBOR tag, the value will |
289 | encoded as appropriate for the value. |
294 | be encoded as appropriate for the value. You cna use C<CBOR::XS::tag> to |
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295 | create such objects. |
290 | |
296 | |
291 | =item Types::Serialiser::true, Types::Serialiser::false, Types::Serialiser::error |
297 | =item Types::Serialiser::true, Types::Serialiser::false, Types::Serialiser::error |
292 | |
298 | |
293 | These special values become CBOR true, CBOR false and CBOR undefined |
299 | These special values become CBOR true, CBOR false and CBOR undefined |
294 | values, respectively. You can also use C<\1>, C<\0> and C<\undef> directly |
300 | values, respectively. You can also use C<\1>, C<\0> and C<\undef> directly |
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515 | |
521 | |
516 | sub CBOR::XS::Tagged::value { |
522 | sub CBOR::XS::Tagged::value { |
517 | $_[0][1] = $_[1] if $#_; |
523 | $_[0][1] = $_[1] if $#_; |
518 | $_[0][1] |
524 | $_[0][1] |
519 | } |
525 | } |
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526 | |
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527 | =head2 EXAMPLES |
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528 | |
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529 | Here are some examples of C<CBOR::XS::Tagged> uses to tag objects. |
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530 | |
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531 | You can look up CBOR tag value and emanings in the IANA registry at |
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532 | L<http://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml>. |
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533 | |
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534 | Prepend a magic header (C<$CBOR::XS::MAGIC>): |
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535 | |
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536 | my $cbor = encode_cbor CBOR::XS::tag 55799, $value; |
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537 | # same as: |
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538 | my $cbor = $CBOR::XS::MAGIC . encode_cbor $value; |
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539 | |
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540 | Serialise some URIs and a regex in an array: |
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541 | |
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542 | my $cbor = encode_cbor [ |
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543 | (CBOR::XS::tag 32, "http://www.nethype.de/"), |
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544 | (CBOR::XS::tag 32, "http://software.schmorp.de/"), |
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545 | (CBOR::XS::tag 35, "^[Pp][Ee][Rr][lL]\$"), |
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546 | ]; |
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547 | |
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548 | Wrap CBOR data in CBOR: |
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549 | |
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550 | my $cbor_cbor = encode_cbor |
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551 | CBOR::XS::tag 24, |
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552 | encode_cbor [1, 2, 3]; |
520 | |
553 | |
521 | =head1 CBOR and JSON |
554 | =head1 CBOR and JSON |
522 | |
555 | |
523 | CBOR is supposed to implement a superset of the JSON data model, and is, |
556 | CBOR is supposed to implement a superset of the JSON data model, and is, |
524 | with some coercion, able to represent all JSON texts (something that other |
557 | with some coercion, able to represent all JSON texts (something that other |