write_msgpack()

template<typename BasicJsonType , typename CharType >

void nlohmann::detail::binary_writer< BasicJsonType, CharType >::write_msgpack ( const BasicJsonType &  j )

inline

Parameters

[in]

j

JSON value to serialize

Definition at line 14215 of file json.hpp.

    {
        switch (j.type())
        {
            case value_t::null: // nil
            {
                oa->write_character(to_char_type(0xC0));
                break;
            }
 
            case value_t::boolean: // true and false
            {
                oa->write_character(j.m_value.boolean
                                    ? to_char_type(0xC3)
                                    : to_char_type(0xC2));
                break;
            }
 
            case value_t::number_integer:
            {
                if (j.m_value.number_integer >= 0)
                {
                    // MessagePack does not differentiate between positive
                    // signed integers and unsigned integers. Therefore, we used
                    // the code from the value_t::number_unsigned case here.
                    if (j.m_value.number_unsigned < 128)
                    {
                        // positive fixnum
                        write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
                    {
                        // uint 8
                        oa->write_character(to_char_type(0xCC));
                        write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
                    {
                        // uint 16
                        oa->write_character(to_char_type(0xCD));
                        write_number(static_cast<std::uint16_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
                    {
                        // uint 32
                        oa->write_character(to_char_type(0xCE));
                        write_number(static_cast<std::uint32_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint64_t>::max)())
                    {
                        // uint 64
                        oa->write_character(to_char_type(0xCF));
                        write_number(static_cast<std::uint64_t>(j.m_value.number_integer));
                    }
                }
 
                else
                {
                    if (j.m_value.number_integer >= -32)
                    {
                        // negative fixnum
                        write_number(static_cast<std::int8_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_integer >= (std::numeric_limits<std::int8_t>::min)() &&
                             j.m_value.number_integer <= (std::numeric_limits<std::int8_t>::max)())
                    {
                        // int 8
                        oa->write_character(to_char_type(0xD0));
                        write_number(static_cast<std::int8_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_integer >= (std::numeric_limits<std::int16_t>::min)() &&
                             j.m_value.number_integer <= (std::numeric_limits<std::int16_t>::max)())
                    {
                        // int 16
                        oa->write_character(to_char_type(0xD1));
                        write_number(static_cast<std::int16_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_integer >= (std::numeric_limits<std::int32_t>::min)() &&
                             j.m_value.number_integer <= (std::numeric_limits<std::int32_t>::max)())
                    {
                        // int 32
                        oa->write_character(to_char_type(0xD2));
                        write_number(static_cast<std::int32_t>(j.m_value.number_integer));
                    }
 
                    else if (j.m_value.number_integer >= (std::numeric_limits<std::int64_t>::min)() &&
                             j.m_value.number_integer <= (std::numeric_limits<std::int64_t>::max)())
                    {
                        // int 64
                        oa->write_character(to_char_type(0xD3));
                        write_number(static_cast<std::int64_t>(j.m_value.number_integer));
                    }
                }
 
                break;
            }
 
            case value_t::number_unsigned:
            {
                if (j.m_value.number_unsigned < 128)
                {
                    // positive fixnum
                    write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
                }
 
                else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
                {
                    // uint 8
                    oa->write_character(to_char_type(0xCC));
                    write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
                }
 
                else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
                {
                    // uint 16
                    oa->write_character(to_char_type(0xCD));
                    write_number(static_cast<std::uint16_t>(j.m_value.number_integer));
                }
 
                else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
                {
                    // uint 32
                    oa->write_character(to_char_type(0xCE));
                    write_number(static_cast<std::uint32_t>(j.m_value.number_integer));
                }
 
                else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint64_t>::max)())
                {
                    // uint 64
                    oa->write_character(to_char_type(0xCF));
                    write_number(static_cast<std::uint64_t>(j.m_value.number_integer));
                }
 
                break;
            }
 
            case value_t::number_float:
            {
                write_compact_float(j.m_value.number_float, detail::input_format_t::msgpack);
                break;
            }
 
            case value_t::string:
            {
                // step 1: write control byte and the string length
                const auto N = j.m_value.string->size();
 
                if (N <= 31)
                {
                    // fixstr
                    write_number(static_cast<std::uint8_t>(0xA0 | N));
                }
 
                else if (N <= (std::numeric_limits<std::uint8_t>::max)())
                {
                    // str 8
                    oa->write_character(to_char_type(0xD9));
                    write_number(static_cast<std::uint8_t>(N));
                }
 
                else if (N <= (std::numeric_limits<std::uint16_t>::max)())
                {
                    // str 16
                    oa->write_character(to_char_type(0xDA));
                    write_number(static_cast<std::uint16_t>(N));
                }
 
                else if (N <= (std::numeric_limits<std::uint32_t>::max)())
                {
                    // str 32
                    oa->write_character(to_char_type(0xDB));
                    write_number(static_cast<std::uint32_t>(N));
                }
 
                // step 2: write the string
                oa->write_characters(
                    reinterpret_cast<const CharType *>(j.m_value.string->c_str()),
                    j.m_value.string->size());
                break;
            }
 
            case value_t::array:
            {
                // step 1: write control byte and the array size
                const auto N = j.m_value.array->size();
 
                if (N <= 15)
                {
                    // fixarray
                    write_number(static_cast<std::uint8_t>(0x90 | N));
                }
 
                else if (N <= (std::numeric_limits<std::uint16_t>::max)())
                {
                    // array 16
                    oa->write_character(to_char_type(0xDC));
                    write_number(static_cast<std::uint16_t>(N));
                }
 
                else if (N <= (std::numeric_limits<std::uint32_t>::max)())
                {
                    // array 32
                    oa->write_character(to_char_type(0xDD));
                    write_number(static_cast<std::uint32_t>(N));
                }
 
                // step 2: write each element
                for (const auto &el : *j.m_value.array)
                {
                    write_msgpack(el);
                }
 
                break;
            }
 
            case value_t::binary:
            {
                // step 0: determine if the binary type has a set subtype to
                // determine whether or not to use the ext or fixext types
                const bool use_ext = j.m_value.binary->has_subtype();
                // step 1: write control byte and the byte string length
                const auto N = j.m_value.binary->size();
 
                if (N <= (std::numeric_limits<std::uint8_t>::max)())
                {
                    std::uint8_t output_type{};
                    bool fixed = true;
 
                    if (use_ext)
                    {
                        switch (N)
                        {
                            case 1:
                                output_type = 0xD4; // fixext 1
                                break;
 
                            case 2:
                                output_type = 0xD5; // fixext 2
                                break;
 
                            case 4:
                                output_type = 0xD6; // fixext 4
                                break;
 
                            case 8:
                                output_type = 0xD7; // fixext 8
                                break;
 
                            case 16:
                                output_type = 0xD8; // fixext 16
                                break;
 
                            default:
                                output_type = 0xC7; // ext 8
                                fixed = false;
                                break;
                        }
                    }
 
                    else
                    {
                        output_type = 0xC4; // bin 8
                        fixed = false;
                    }
 
                    oa->write_character(to_char_type(output_type));
 
                    if (!fixed)
                    {
                        write_number(static_cast<std::uint8_t>(N));
                    }
                }
 
                else if (N <= (std::numeric_limits<std::uint16_t>::max)())
                {
                    std::uint8_t output_type = use_ext
                                               ? 0xC8 // ext 16
                                               : 0xC5; // bin 16
                    oa->write_character(to_char_type(output_type));
                    write_number(static_cast<std::uint16_t>(N));
                }
 
                else if (N <= (std::numeric_limits<std::uint32_t>::max)())
                {
                    std::uint8_t output_type = use_ext
                                               ? 0xC9 // ext 32
                                               : 0xC6; // bin 32
                    oa->write_character(to_char_type(output_type));
                    write_number(static_cast<std::uint32_t>(N));
                }
 
                // step 1.5: if this is an ext type, write the subtype
                if (use_ext)
                {
                    write_number(static_cast<std::int8_t>(j.m_value.binary->subtype()));
                }
 
                // step 2: write the byte string
                oa->write_characters(
                    reinterpret_cast<const CharType *>(j.m_value.binary->data()),
                    N);
                break;
            }
 
            case value_t::object:
            {
                // step 1: write control byte and the object size
                const auto N = j.m_value.object->size();
 
                if (N <= 15)
                {
                    // fixmap
                    write_number(static_cast<std::uint8_t>(0x80 | (N & 0xF)));
                }
 
                else if (N <= (std::numeric_limits<std::uint16_t>::max)())
                {
                    // map 16
                    oa->write_character(to_char_type(0xDE));
                    write_number(static_cast<std::uint16_t>(N));
                }
 
                else if (N <= (std::numeric_limits<std::uint32_t>::max)())
                {
                    // map 32
                    oa->write_character(to_char_type(0xDF));
                    write_number(static_cast<std::uint32_t>(N));
                }
 
                // step 2: write each element
                for (const auto &el : *j.m_value.object)
                {
                    write_msgpack(el.first);
                    write_msgpack(el.second);
                }
 
                break;
            }
 
            case value_t::discarded:
            default:
                break;
        }
    }