cbor.md

cbor extension

The cbor extension implements decode from and encode to the IETF standard Concise Binary Object Representation (CBOR). It supports decoding a packed CBOR value to an unpacked (json) value and encoding an unpacked (json) value to a packed CBOR value. It also supports a set of operations on a view (cbor_view) of a packed CBOR value for iterating over and accessing nested data items.

decode_cbor

encode_cbor

cbor_view

Examples

#include <jsoncons/json.hpp>
#include <jsoncons_ext/cbor/cbor.hpp>
#include <jsoncons_ext/jsonpointer/jsonpointer.hpp>

using namespace jsoncons;

int main()
{
    ojson j1 = ojson::parse(R"(
    {
       "application": "hiking",
       "reputons": [
       {
           "rater": "HikingAsylum.example.com",
           "assertion": "is-good",
           "rated": "sk",
           "rating": 0.90
         }
       ]
    }
    )");

    // Encoding an unpacked (json) value to a packed CBOR value
    std::vector<uint8_t> data;
    cbor::encode_cbor(j1, data);

    // Decoding a packed CBOR value to an unpacked (json) value
    ojson j2 = cbor::decode_cbor<ojson>(data);
    std::cout << "(1)\n" << pretty_print(j2) << "\n\n";

    // Iterating over and accessing the nested data items of a packed CBOR value
    cbor::cbor_view datav{data};    
    cbor::cbor_view reputons = datav.at("reputons");    

    std::cout << "(2)\n";
    for (auto element : reputons.array_range())
    {
        std::cout << element.at("rated").as_string() << ", ";
        std::cout << element.at("rating").as_double() << "\n";
    }
    std::cout << std::endl;

    // Querying a packed CBOR value for a nested data item with jsonpointer
    std::error_code ec;
    cbor::cbor_view rated = jsonpointer::get(datav, "/reputons/0/rated", ec);
    if (!ec)
    {
        std::cout << "(3) " << rated.as_string() << "\n";
    }

Output:

(1)
{
    "application": "hiking",
    "reputons": [
        {
            "rater": "HikingAsylum.example.com",
            "assertion": "is-good",
            "rated": "sk",
            "rating": 0.9
        }
    ]
}

(2)
sk, 0.9

(3) sk