1547 lines
56 KiB
C++
1547 lines
56 KiB
C++
#pragma once
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#include <algorithm> // reverse
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#include <array> // array
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#include <cstdint> // uint8_t, uint16_t, uint32_t, uint64_t
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#include <cstring> // memcpy
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#include <limits> // numeric_limits
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#include <string> // string
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#include <nlohmann/detail/input/binary_reader.hpp>
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#include <nlohmann/detail/macro_scope.hpp>
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#include <nlohmann/detail/output/output_adapters.hpp>
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namespace nlohmann
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{
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namespace detail
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{
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///////////////////
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// binary writer //
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///////////////////
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/*!
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@brief serialization to CBOR and MessagePack values
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*/
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template<typename BasicJsonType, typename CharType>
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class binary_writer
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{
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using string_t = typename BasicJsonType::string_t;
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using internal_binary_t = typename BasicJsonType::internal_binary_t;
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public:
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/*!
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@brief create a binary writer
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@param[in] adapter output adapter to write to
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*/
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explicit binary_writer(output_adapter_t<CharType> adapter) : oa(adapter)
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{
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assert(oa);
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}
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/*!
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@param[in] j JSON value to serialize
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@pre j.type() == value_t::object
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*/
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void write_bson(const BasicJsonType& j)
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{
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switch (j.type())
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{
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case value_t::object:
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{
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write_bson_object(*j.m_value.object);
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break;
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}
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default:
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{
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JSON_THROW(type_error::create(317, "to serialize to BSON, top-level type must be object, but is " + std::string(j.type_name())));
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}
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}
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}
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/*!
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@param[in] j JSON value to serialize
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*/
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void write_cbor(const BasicJsonType& j)
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{
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switch (j.type())
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{
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case value_t::null:
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{
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oa->write_character(to_char_type(0xF6));
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break;
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}
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case value_t::boolean:
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{
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oa->write_character(j.m_value.boolean
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? to_char_type(0xF5)
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: to_char_type(0xF4));
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break;
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}
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case value_t::number_integer:
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{
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if (j.m_value.number_integer >= 0)
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{
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// CBOR does not differentiate between positive signed
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// integers and unsigned integers. Therefore, we used the
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// code from the value_t::number_unsigned case here.
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if (j.m_value.number_integer <= 0x17)
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{
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write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0x18));
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write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0x19));
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write_number(static_cast<std::uint16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0x1A));
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write_number(static_cast<std::uint32_t>(j.m_value.number_integer));
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}
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else
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{
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oa->write_character(to_char_type(0x1B));
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write_number(static_cast<std::uint64_t>(j.m_value.number_integer));
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}
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}
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else
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{
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// The conversions below encode the sign in the first
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// byte, and the value is converted to a positive number.
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const auto positive_number = -1 - j.m_value.number_integer;
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if (j.m_value.number_integer >= -24)
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{
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write_number(static_cast<std::uint8_t>(0x20 + positive_number));
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}
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else if (positive_number <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0x38));
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write_number(static_cast<std::uint8_t>(positive_number));
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}
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else if (positive_number <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0x39));
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write_number(static_cast<std::uint16_t>(positive_number));
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}
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else if (positive_number <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0x3A));
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write_number(static_cast<std::uint32_t>(positive_number));
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}
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else
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{
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oa->write_character(to_char_type(0x3B));
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write_number(static_cast<std::uint64_t>(positive_number));
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}
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}
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break;
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}
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case value_t::number_unsigned:
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{
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if (j.m_value.number_unsigned <= 0x17)
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{
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write_number(static_cast<std::uint8_t>(j.m_value.number_unsigned));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0x18));
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write_number(static_cast<std::uint8_t>(j.m_value.number_unsigned));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0x19));
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write_number(static_cast<std::uint16_t>(j.m_value.number_unsigned));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0x1A));
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write_number(static_cast<std::uint32_t>(j.m_value.number_unsigned));
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}
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else
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{
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oa->write_character(to_char_type(0x1B));
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write_number(static_cast<std::uint64_t>(j.m_value.number_unsigned));
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}
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break;
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}
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case value_t::number_float:
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{
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oa->write_character(get_cbor_float_prefix(j.m_value.number_float));
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write_number(j.m_value.number_float);
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break;
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}
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case value_t::string:
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{
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// step 1: write control byte and the string length
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const auto N = j.m_value.string->size();
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if (N <= 0x17)
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{
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write_number(static_cast<std::uint8_t>(0x60 + N));
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}
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else if (N <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0x78));
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write_number(static_cast<std::uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0x79));
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write_number(static_cast<std::uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0x7A));
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write_number(static_cast<std::uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<std::uint64_t>::max)())
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{
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oa->write_character(to_char_type(0x7B));
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write_number(static_cast<std::uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write the string
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oa->write_characters(
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reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
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j.m_value.string->size());
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break;
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}
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case value_t::array:
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{
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// step 1: write control byte and the array size
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const auto N = j.m_value.array->size();
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if (N <= 0x17)
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{
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write_number(static_cast<std::uint8_t>(0x80 + N));
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}
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else if (N <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0x98));
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write_number(static_cast<std::uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0x99));
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write_number(static_cast<std::uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0x9A));
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write_number(static_cast<std::uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<std::uint64_t>::max)())
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{
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oa->write_character(to_char_type(0x9B));
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write_number(static_cast<std::uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write each element
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for (const auto& el : *j.m_value.array)
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{
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write_cbor(el);
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}
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break;
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}
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case value_t::binary:
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{
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// step 1: write control byte and the binary array size
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const auto N = j.m_value.binary->size();
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if (N <= 0x17)
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{
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write_number(static_cast<std::uint8_t>(0x40 + N));
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}
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else if (N <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0x58));
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write_number(static_cast<std::uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0x59));
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write_number(static_cast<std::uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0x5A));
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write_number(static_cast<std::uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<std::uint64_t>::max)())
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{
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oa->write_character(to_char_type(0x5B));
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write_number(static_cast<std::uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write each element
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oa->write_characters(
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reinterpret_cast<const CharType*>(j.m_value.binary->data()),
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N);
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break;
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}
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case value_t::object:
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{
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// step 1: write control byte and the object size
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const auto N = j.m_value.object->size();
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if (N <= 0x17)
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{
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write_number(static_cast<std::uint8_t>(0xA0 + N));
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}
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else if (N <= (std::numeric_limits<std::uint8_t>::max)())
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{
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oa->write_character(to_char_type(0xB8));
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write_number(static_cast<std::uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint16_t>::max)())
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{
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oa->write_character(to_char_type(0xB9));
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write_number(static_cast<std::uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<std::uint32_t>::max)())
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{
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oa->write_character(to_char_type(0xBA));
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write_number(static_cast<std::uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<std::uint64_t>::max)())
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{
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oa->write_character(to_char_type(0xBB));
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write_number(static_cast<std::uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write each element
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for (const auto& el : *j.m_value.object)
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{
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write_cbor(el.first);
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write_cbor(el.second);
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}
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break;
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}
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default:
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break;
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}
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}
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/*!
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@param[in] j JSON value to serialize
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*/
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void write_msgpack(const BasicJsonType& j)
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{
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switch (j.type())
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{
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case value_t::null: // nil
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{
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oa->write_character(to_char_type(0xC0));
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break;
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}
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case value_t::boolean: // true and false
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{
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oa->write_character(j.m_value.boolean
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? to_char_type(0xC3)
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: to_char_type(0xC2));
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break;
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}
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case value_t::number_integer:
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{
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if (j.m_value.number_integer >= 0)
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{
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// MessagePack does not differentiate between positive
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// signed integers and unsigned integers. Therefore, we used
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// the code from the value_t::number_unsigned case here.
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if (j.m_value.number_unsigned < 128)
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{
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// positive fixnum
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write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
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{
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// uint 8
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oa->write_character(to_char_type(0xCC));
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write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
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{
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// uint 16
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oa->write_character(to_char_type(0xCD));
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write_number(static_cast<std::uint16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
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{
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// uint 32
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oa->write_character(to_char_type(0xCE));
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write_number(static_cast<std::uint32_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint64_t>::max)())
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{
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// uint 64
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oa->write_character(to_char_type(0xCF));
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write_number(static_cast<std::uint64_t>(j.m_value.number_integer));
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}
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}
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else
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{
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if (j.m_value.number_integer >= -32)
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{
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// negative fixnum
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write_number(static_cast<std::int8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<std::int8_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<std::int8_t>::max)())
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{
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// int 8
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oa->write_character(to_char_type(0xD0));
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write_number(static_cast<std::int8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<std::int16_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<std::int16_t>::max)())
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{
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// int 16
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oa->write_character(to_char_type(0xD1));
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write_number(static_cast<std::int16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<std::int32_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<std::int32_t>::max)())
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{
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// int 32
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oa->write_character(to_char_type(0xD2));
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write_number(static_cast<std::int32_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<std::int64_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<std::int64_t>::max)())
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{
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// int 64
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oa->write_character(to_char_type(0xD3));
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write_number(static_cast<std::int64_t>(j.m_value.number_integer));
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}
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}
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break;
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}
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|
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case value_t::number_unsigned:
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{
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if (j.m_value.number_unsigned < 128)
|
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{
|
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// positive fixnum
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write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
|
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}
|
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
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{
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// uint 8
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oa->write_character(to_char_type(0xCC));
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write_number(static_cast<std::uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
|
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{
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// uint 16
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oa->write_character(to_char_type(0xCD));
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write_number(static_cast<std::uint16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
|
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{
|
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// uint 32
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oa->write_character(to_char_type(0xCE));
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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)())
|
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{
|
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// uint 64
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oa->write_character(to_char_type(0xCF));
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write_number(static_cast<std::uint64_t>(j.m_value.number_integer));
|
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}
|
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break;
|
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}
|
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|
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case value_t::number_float:
|
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{
|
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oa->write_character(get_msgpack_float_prefix(j.m_value.number_float));
|
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write_number(j.m_value.number_float);
|
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break;
|
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}
|
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|
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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 (not fixed)
|
|
{
|
|
write_number(static_cast<std::uint8_t>(N));
|
|
}
|
|
}
|
|
else if (N <= (std::numeric_limits<std::uint16_t>::max)())
|
|
{
|
|
std::uint8_t output_type;
|
|
if (use_ext)
|
|
{
|
|
output_type = 0xC8; // ext 16
|
|
}
|
|
else
|
|
{
|
|
output_type = 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;
|
|
if (use_ext)
|
|
{
|
|
output_type = 0xC9; // ext 32
|
|
}
|
|
else
|
|
{
|
|
output_type = 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(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;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@param[in] j JSON value to serialize
|
|
@param[in] use_count whether to use '#' prefixes (optimized format)
|
|
@param[in] use_type whether to use '$' prefixes (optimized format)
|
|
@param[in] add_prefix whether prefixes need to be used for this value
|
|
*/
|
|
void write_ubjson(const BasicJsonType& j, const bool use_count,
|
|
const bool use_type, const bool add_prefix = true)
|
|
{
|
|
switch (j.type())
|
|
{
|
|
case value_t::null:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('Z'));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case value_t::boolean:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(j.m_value.boolean
|
|
? to_char_type('T')
|
|
: to_char_type('F'));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case value_t::number_integer:
|
|
{
|
|
write_number_with_ubjson_prefix(j.m_value.number_integer, add_prefix);
|
|
break;
|
|
}
|
|
|
|
case value_t::number_unsigned:
|
|
{
|
|
write_number_with_ubjson_prefix(j.m_value.number_unsigned, add_prefix);
|
|
break;
|
|
}
|
|
|
|
case value_t::number_float:
|
|
{
|
|
write_number_with_ubjson_prefix(j.m_value.number_float, add_prefix);
|
|
break;
|
|
}
|
|
|
|
case value_t::string:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('S'));
|
|
}
|
|
write_number_with_ubjson_prefix(j.m_value.string->size(), true);
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
|
|
j.m_value.string->size());
|
|
break;
|
|
}
|
|
|
|
case value_t::array:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('['));
|
|
}
|
|
|
|
bool prefix_required = true;
|
|
if (use_type and not j.m_value.array->empty())
|
|
{
|
|
assert(use_count);
|
|
const CharType first_prefix = ubjson_prefix(j.front());
|
|
const bool same_prefix = std::all_of(j.begin() + 1, j.end(),
|
|
[this, first_prefix](const BasicJsonType & v)
|
|
{
|
|
return ubjson_prefix(v) == first_prefix;
|
|
});
|
|
|
|
if (same_prefix)
|
|
{
|
|
prefix_required = false;
|
|
oa->write_character(to_char_type('$'));
|
|
oa->write_character(first_prefix);
|
|
}
|
|
}
|
|
|
|
if (use_count)
|
|
{
|
|
oa->write_character(to_char_type('#'));
|
|
write_number_with_ubjson_prefix(j.m_value.array->size(), true);
|
|
}
|
|
|
|
for (const auto& el : *j.m_value.array)
|
|
{
|
|
write_ubjson(el, use_count, use_type, prefix_required);
|
|
}
|
|
|
|
if (not use_count)
|
|
{
|
|
oa->write_character(to_char_type(']'));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case value_t::binary:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('['));
|
|
}
|
|
|
|
if (use_type and not j.m_value.binary->empty())
|
|
{
|
|
assert(use_count);
|
|
oa->write_character(to_char_type('$'));
|
|
oa->write_character('U');
|
|
}
|
|
|
|
if (use_count)
|
|
{
|
|
oa->write_character(to_char_type('#'));
|
|
write_number_with_ubjson_prefix(j.m_value.binary->size(), true);
|
|
}
|
|
|
|
if (use_type)
|
|
{
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(j.m_value.binary->data()),
|
|
j.m_value.binary->size());
|
|
}
|
|
else
|
|
{
|
|
for (size_t i = 0; i < j.m_value.binary->size(); ++i)
|
|
{
|
|
oa->write_character(to_char_type('U'));
|
|
oa->write_character(j.m_value.binary->data()[i]);
|
|
}
|
|
}
|
|
|
|
if (not use_count)
|
|
{
|
|
oa->write_character(to_char_type(']'));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case value_t::object:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('{'));
|
|
}
|
|
|
|
bool prefix_required = true;
|
|
if (use_type and not j.m_value.object->empty())
|
|
{
|
|
assert(use_count);
|
|
const CharType first_prefix = ubjson_prefix(j.front());
|
|
const bool same_prefix = std::all_of(j.begin(), j.end(),
|
|
[this, first_prefix](const BasicJsonType & v)
|
|
{
|
|
return ubjson_prefix(v) == first_prefix;
|
|
});
|
|
|
|
if (same_prefix)
|
|
{
|
|
prefix_required = false;
|
|
oa->write_character(to_char_type('$'));
|
|
oa->write_character(first_prefix);
|
|
}
|
|
}
|
|
|
|
if (use_count)
|
|
{
|
|
oa->write_character(to_char_type('#'));
|
|
write_number_with_ubjson_prefix(j.m_value.object->size(), true);
|
|
}
|
|
|
|
for (const auto& el : *j.m_value.object)
|
|
{
|
|
write_number_with_ubjson_prefix(el.first.size(), true);
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(el.first.c_str()),
|
|
el.first.size());
|
|
write_ubjson(el.second, use_count, use_type, prefix_required);
|
|
}
|
|
|
|
if (not use_count)
|
|
{
|
|
oa->write_character(to_char_type('}'));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
private:
|
|
//////////
|
|
// BSON //
|
|
//////////
|
|
|
|
/*!
|
|
@return The size of a BSON document entry header, including the id marker
|
|
and the entry name size (and its null-terminator).
|
|
*/
|
|
static std::size_t calc_bson_entry_header_size(const string_t& name)
|
|
{
|
|
const auto it = name.find(static_cast<typename string_t::value_type>(0));
|
|
if (JSON_HEDLEY_UNLIKELY(it != BasicJsonType::string_t::npos))
|
|
{
|
|
JSON_THROW(out_of_range::create(409,
|
|
"BSON key cannot contain code point U+0000 (at byte " + std::to_string(it) + ")"));
|
|
}
|
|
|
|
return /*id*/ 1ul + name.size() + /*zero-terminator*/1u;
|
|
}
|
|
|
|
/*!
|
|
@brief Writes the given @a element_type and @a name to the output adapter
|
|
*/
|
|
void write_bson_entry_header(const string_t& name,
|
|
const std::uint8_t element_type)
|
|
{
|
|
oa->write_character(to_char_type(element_type)); // boolean
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(name.c_str()),
|
|
name.size() + 1u);
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and boolean value @a value
|
|
*/
|
|
void write_bson_boolean(const string_t& name,
|
|
const bool value)
|
|
{
|
|
write_bson_entry_header(name, 0x08);
|
|
oa->write_character(value ? to_char_type(0x01) : to_char_type(0x00));
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and double value @a value
|
|
*/
|
|
void write_bson_double(const string_t& name,
|
|
const double value)
|
|
{
|
|
write_bson_entry_header(name, 0x01);
|
|
write_number<double, true>(value);
|
|
}
|
|
|
|
/*!
|
|
@return The size of the BSON-encoded string in @a value
|
|
*/
|
|
static std::size_t calc_bson_string_size(const string_t& value)
|
|
{
|
|
return sizeof(std::int32_t) + value.size() + 1ul;
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and string value @a value
|
|
*/
|
|
void write_bson_string(const string_t& name,
|
|
const string_t& value)
|
|
{
|
|
write_bson_entry_header(name, 0x02);
|
|
|
|
write_number<std::int32_t, true>(static_cast<std::int32_t>(value.size() + 1ul));
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(value.c_str()),
|
|
value.size() + 1);
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and null value
|
|
*/
|
|
void write_bson_null(const string_t& name)
|
|
{
|
|
write_bson_entry_header(name, 0x0A);
|
|
}
|
|
|
|
/*!
|
|
@return The size of the BSON-encoded integer @a value
|
|
*/
|
|
static std::size_t calc_bson_integer_size(const std::int64_t value)
|
|
{
|
|
return (std::numeric_limits<std::int32_t>::min)() <= value and value <= (std::numeric_limits<std::int32_t>::max)()
|
|
? sizeof(std::int32_t)
|
|
: sizeof(std::int64_t);
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and integer @a value
|
|
*/
|
|
void write_bson_integer(const string_t& name,
|
|
const std::int64_t value)
|
|
{
|
|
if ((std::numeric_limits<std::int32_t>::min)() <= value and value <= (std::numeric_limits<std::int32_t>::max)())
|
|
{
|
|
write_bson_entry_header(name, 0x10); // int32
|
|
write_number<std::int32_t, true>(static_cast<std::int32_t>(value));
|
|
}
|
|
else
|
|
{
|
|
write_bson_entry_header(name, 0x12); // int64
|
|
write_number<std::int64_t, true>(static_cast<std::int64_t>(value));
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@return The size of the BSON-encoded unsigned integer in @a j
|
|
*/
|
|
static constexpr std::size_t calc_bson_unsigned_size(const std::uint64_t value) noexcept
|
|
{
|
|
return (value <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
|
|
? sizeof(std::int32_t)
|
|
: sizeof(std::int64_t);
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and unsigned @a value
|
|
*/
|
|
void write_bson_unsigned(const string_t& name,
|
|
const std::uint64_t value)
|
|
{
|
|
if (value <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
|
|
{
|
|
write_bson_entry_header(name, 0x10 /* int32 */);
|
|
write_number<std::int32_t, true>(static_cast<std::int32_t>(value));
|
|
}
|
|
else if (value <= static_cast<std::uint64_t>((std::numeric_limits<std::int64_t>::max)()))
|
|
{
|
|
write_bson_entry_header(name, 0x12 /* int64 */);
|
|
write_number<std::int64_t, true>(static_cast<std::int64_t>(value));
|
|
}
|
|
else
|
|
{
|
|
JSON_THROW(out_of_range::create(407, "integer number " + std::to_string(value) + " cannot be represented by BSON as it does not fit int64"));
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and object @a value
|
|
*/
|
|
void write_bson_object_entry(const string_t& name,
|
|
const typename BasicJsonType::object_t& value)
|
|
{
|
|
write_bson_entry_header(name, 0x03); // object
|
|
write_bson_object(value);
|
|
}
|
|
|
|
/*!
|
|
@return The size of the BSON-encoded array @a value
|
|
*/
|
|
static std::size_t calc_bson_array_size(const typename BasicJsonType::array_t& value)
|
|
{
|
|
std::size_t array_index = 0ul;
|
|
|
|
const std::size_t embedded_document_size = std::accumulate(std::begin(value), std::end(value), std::size_t(0), [&array_index](std::size_t result, const typename BasicJsonType::array_t::value_type & el)
|
|
{
|
|
return result + calc_bson_element_size(std::to_string(array_index++), el);
|
|
});
|
|
|
|
return sizeof(std::int32_t) + embedded_document_size + 1ul;
|
|
}
|
|
|
|
/*!
|
|
@return The size of the BSON-encoded binary array @a value
|
|
*/
|
|
static std::size_t calc_bson_binary_size(const typename BasicJsonType::internal_binary_t& value)
|
|
{
|
|
return sizeof(std::int32_t) + value.size() + 1ul;
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and array @a value
|
|
*/
|
|
void write_bson_array(const string_t& name,
|
|
const typename BasicJsonType::array_t& value)
|
|
{
|
|
write_bson_entry_header(name, 0x04); // array
|
|
write_number<std::int32_t, true>(static_cast<std::int32_t>(calc_bson_array_size(value)));
|
|
|
|
std::size_t array_index = 0ul;
|
|
|
|
for (const auto& el : value)
|
|
{
|
|
write_bson_element(std::to_string(array_index++), el);
|
|
}
|
|
|
|
oa->write_character(to_char_type(0x00));
|
|
}
|
|
|
|
/*!
|
|
@brief Writes a BSON element with key @a name and binary value @a value
|
|
*/
|
|
void write_bson_binary(const string_t& name,
|
|
const internal_binary_t& value)
|
|
{
|
|
write_bson_entry_header(name, 0x05);
|
|
|
|
write_number<std::int32_t, true>(static_cast<std::int32_t>(value.size()));
|
|
std::uint8_t subtype = 0x00; // Generic Binary Subtype
|
|
if (value.has_subtype)
|
|
{
|
|
subtype = value.subtype;
|
|
}
|
|
write_number(subtype);
|
|
|
|
oa->write_characters(reinterpret_cast<const CharType*>(value.data()), value.size());
|
|
}
|
|
|
|
/*!
|
|
@brief Calculates the size necessary to serialize the JSON value @a j with its @a name
|
|
@return The calculated size for the BSON document entry for @a j with the given @a name.
|
|
*/
|
|
static std::size_t calc_bson_element_size(const string_t& name,
|
|
const BasicJsonType& j)
|
|
{
|
|
const auto header_size = calc_bson_entry_header_size(name);
|
|
switch (j.type())
|
|
{
|
|
case value_t::object:
|
|
return header_size + calc_bson_object_size(*j.m_value.object);
|
|
|
|
case value_t::array:
|
|
return header_size + calc_bson_array_size(*j.m_value.array);
|
|
|
|
case value_t::binary:
|
|
return header_size + calc_bson_binary_size(*j.m_value.binary);
|
|
|
|
case value_t::boolean:
|
|
return header_size + 1ul;
|
|
|
|
case value_t::number_float:
|
|
return header_size + 8ul;
|
|
|
|
case value_t::number_integer:
|
|
return header_size + calc_bson_integer_size(j.m_value.number_integer);
|
|
|
|
case value_t::number_unsigned:
|
|
return header_size + calc_bson_unsigned_size(j.m_value.number_unsigned);
|
|
|
|
case value_t::string:
|
|
return header_size + calc_bson_string_size(*j.m_value.string);
|
|
|
|
case value_t::null:
|
|
return header_size + 0ul;
|
|
|
|
// LCOV_EXCL_START
|
|
default:
|
|
assert(false);
|
|
return 0ul;
|
|
// LCOV_EXCL_STOP
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@brief Serializes the JSON value @a j to BSON and associates it with the
|
|
key @a name.
|
|
@param name The name to associate with the JSON entity @a j within the
|
|
current BSON document
|
|
@return The size of the BSON entry
|
|
*/
|
|
void write_bson_element(const string_t& name,
|
|
const BasicJsonType& j)
|
|
{
|
|
switch (j.type())
|
|
{
|
|
case value_t::object:
|
|
return write_bson_object_entry(name, *j.m_value.object);
|
|
|
|
case value_t::array:
|
|
return write_bson_array(name, *j.m_value.array);
|
|
|
|
case value_t::binary:
|
|
return write_bson_binary(name, *j.m_value.binary);
|
|
|
|
case value_t::boolean:
|
|
return write_bson_boolean(name, j.m_value.boolean);
|
|
|
|
case value_t::number_float:
|
|
return write_bson_double(name, j.m_value.number_float);
|
|
|
|
case value_t::number_integer:
|
|
return write_bson_integer(name, j.m_value.number_integer);
|
|
|
|
case value_t::number_unsigned:
|
|
return write_bson_unsigned(name, j.m_value.number_unsigned);
|
|
|
|
case value_t::string:
|
|
return write_bson_string(name, *j.m_value.string);
|
|
|
|
case value_t::null:
|
|
return write_bson_null(name);
|
|
|
|
// LCOV_EXCL_START
|
|
default:
|
|
assert(false);
|
|
return;
|
|
// LCOV_EXCL_STOP
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@brief Calculates the size of the BSON serialization of the given
|
|
JSON-object @a j.
|
|
@param[in] j JSON value to serialize
|
|
@pre j.type() == value_t::object
|
|
*/
|
|
static std::size_t calc_bson_object_size(const typename BasicJsonType::object_t& value)
|
|
{
|
|
std::size_t document_size = std::accumulate(value.begin(), value.end(), std::size_t(0),
|
|
[](size_t result, const typename BasicJsonType::object_t::value_type & el)
|
|
{
|
|
return result += calc_bson_element_size(el.first, el.second);
|
|
});
|
|
|
|
return sizeof(std::int32_t) + document_size + 1ul;
|
|
}
|
|
|
|
/*!
|
|
@param[in] j JSON value to serialize
|
|
@pre j.type() == value_t::object
|
|
*/
|
|
void write_bson_object(const typename BasicJsonType::object_t& value)
|
|
{
|
|
write_number<std::int32_t, true>(static_cast<std::int32_t>(calc_bson_object_size(value)));
|
|
|
|
for (const auto& el : value)
|
|
{
|
|
write_bson_element(el.first, el.second);
|
|
}
|
|
|
|
oa->write_character(to_char_type(0x00));
|
|
}
|
|
|
|
//////////
|
|
// CBOR //
|
|
//////////
|
|
|
|
static constexpr CharType get_cbor_float_prefix(float /*unused*/)
|
|
{
|
|
return to_char_type(0xFA); // Single-Precision Float
|
|
}
|
|
|
|
static constexpr CharType get_cbor_float_prefix(double /*unused*/)
|
|
{
|
|
return to_char_type(0xFB); // Double-Precision Float
|
|
}
|
|
|
|
/////////////
|
|
// MsgPack //
|
|
/////////////
|
|
|
|
static constexpr CharType get_msgpack_float_prefix(float /*unused*/)
|
|
{
|
|
return to_char_type(0xCA); // float 32
|
|
}
|
|
|
|
static constexpr CharType get_msgpack_float_prefix(double /*unused*/)
|
|
{
|
|
return to_char_type(0xCB); // float 64
|
|
}
|
|
|
|
////////////
|
|
// UBJSON //
|
|
////////////
|
|
|
|
// UBJSON: write number (floating point)
|
|
template<typename NumberType, typename std::enable_if<
|
|
std::is_floating_point<NumberType>::value, int>::type = 0>
|
|
void write_number_with_ubjson_prefix(const NumberType n,
|
|
const bool add_prefix)
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(get_ubjson_float_prefix(n));
|
|
}
|
|
write_number(n);
|
|
}
|
|
|
|
// UBJSON: write number (unsigned integer)
|
|
template<typename NumberType, typename std::enable_if<
|
|
std::is_unsigned<NumberType>::value, int>::type = 0>
|
|
void write_number_with_ubjson_prefix(const NumberType n,
|
|
const bool add_prefix)
|
|
{
|
|
if (n <= static_cast<std::uint64_t>((std::numeric_limits<std::int8_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('i')); // int8
|
|
}
|
|
write_number(static_cast<std::uint8_t>(n));
|
|
}
|
|
else if (n <= (std::numeric_limits<std::uint8_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('U')); // uint8
|
|
}
|
|
write_number(static_cast<std::uint8_t>(n));
|
|
}
|
|
else if (n <= static_cast<std::uint64_t>((std::numeric_limits<std::int16_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('I')); // int16
|
|
}
|
|
write_number(static_cast<std::int16_t>(n));
|
|
}
|
|
else if (n <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('l')); // int32
|
|
}
|
|
write_number(static_cast<std::int32_t>(n));
|
|
}
|
|
else if (n <= static_cast<std::uint64_t>((std::numeric_limits<std::int64_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('L')); // int64
|
|
}
|
|
write_number(static_cast<std::int64_t>(n));
|
|
}
|
|
else
|
|
{
|
|
JSON_THROW(out_of_range::create(407, "integer number " + std::to_string(n) + " cannot be represented by UBJSON as it does not fit int64"));
|
|
}
|
|
}
|
|
|
|
// UBJSON: write number (signed integer)
|
|
template<typename NumberType, typename std::enable_if<
|
|
std::is_signed<NumberType>::value and
|
|
not std::is_floating_point<NumberType>::value, int>::type = 0>
|
|
void write_number_with_ubjson_prefix(const NumberType n,
|
|
const bool add_prefix)
|
|
{
|
|
if ((std::numeric_limits<std::int8_t>::min)() <= n and n <= (std::numeric_limits<std::int8_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('i')); // int8
|
|
}
|
|
write_number(static_cast<std::int8_t>(n));
|
|
}
|
|
else if (static_cast<std::int64_t>((std::numeric_limits<std::uint8_t>::min)()) <= n and n <= static_cast<std::int64_t>((std::numeric_limits<std::uint8_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('U')); // uint8
|
|
}
|
|
write_number(static_cast<std::uint8_t>(n));
|
|
}
|
|
else if ((std::numeric_limits<std::int16_t>::min)() <= n and n <= (std::numeric_limits<std::int16_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('I')); // int16
|
|
}
|
|
write_number(static_cast<std::int16_t>(n));
|
|
}
|
|
else if ((std::numeric_limits<std::int32_t>::min)() <= n and n <= (std::numeric_limits<std::int32_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('l')); // int32
|
|
}
|
|
write_number(static_cast<std::int32_t>(n));
|
|
}
|
|
else if ((std::numeric_limits<std::int64_t>::min)() <= n and n <= (std::numeric_limits<std::int64_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(to_char_type('L')); // int64
|
|
}
|
|
write_number(static_cast<std::int64_t>(n));
|
|
}
|
|
// LCOV_EXCL_START
|
|
else
|
|
{
|
|
JSON_THROW(out_of_range::create(407, "integer number " + std::to_string(n) + " cannot be represented by UBJSON as it does not fit int64"));
|
|
}
|
|
// LCOV_EXCL_STOP
|
|
}
|
|
|
|
/*!
|
|
@brief determine the type prefix of container values
|
|
|
|
@note This function does not need to be 100% accurate when it comes to
|
|
integer limits. In case a number exceeds the limits of int64_t,
|
|
this will be detected by a later call to function
|
|
write_number_with_ubjson_prefix. Therefore, we return 'L' for any
|
|
value that does not fit the previous limits.
|
|
*/
|
|
CharType ubjson_prefix(const BasicJsonType& j) const noexcept
|
|
{
|
|
switch (j.type())
|
|
{
|
|
case value_t::null:
|
|
return 'Z';
|
|
|
|
case value_t::boolean:
|
|
return j.m_value.boolean ? 'T' : 'F';
|
|
|
|
case value_t::number_integer:
|
|
{
|
|
if ((std::numeric_limits<std::int8_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<std::int8_t>::max)())
|
|
{
|
|
return 'i';
|
|
}
|
|
if ((std::numeric_limits<std::uint8_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<std::uint8_t>::max)())
|
|
{
|
|
return 'U';
|
|
}
|
|
if ((std::numeric_limits<std::int16_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<std::int16_t>::max)())
|
|
{
|
|
return 'I';
|
|
}
|
|
if ((std::numeric_limits<std::int32_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<std::int32_t>::max)())
|
|
{
|
|
return 'l';
|
|
}
|
|
// no check and assume int64_t (see note above)
|
|
return 'L';
|
|
}
|
|
|
|
case value_t::number_unsigned:
|
|
{
|
|
if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int8_t>::max)()))
|
|
{
|
|
return 'i';
|
|
}
|
|
if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::uint8_t>::max)()))
|
|
{
|
|
return 'U';
|
|
}
|
|
if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int16_t>::max)()))
|
|
{
|
|
return 'I';
|
|
}
|
|
if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
|
|
{
|
|
return 'l';
|
|
}
|
|
// no check and assume int64_t (see note above)
|
|
return 'L';
|
|
}
|
|
|
|
case value_t::number_float:
|
|
return get_ubjson_float_prefix(j.m_value.number_float);
|
|
|
|
case value_t::string:
|
|
return 'S';
|
|
|
|
case value_t::array: // fallthrough
|
|
case value_t::binary:
|
|
return '[';
|
|
|
|
case value_t::object:
|
|
return '{';
|
|
|
|
default: // discarded values
|
|
return 'N';
|
|
}
|
|
}
|
|
|
|
static constexpr CharType get_ubjson_float_prefix(float /*unused*/)
|
|
{
|
|
return 'd'; // float 32
|
|
}
|
|
|
|
static constexpr CharType get_ubjson_float_prefix(double /*unused*/)
|
|
{
|
|
return 'D'; // float 64
|
|
}
|
|
|
|
///////////////////////
|
|
// Utility functions //
|
|
///////////////////////
|
|
|
|
/*
|
|
@brief write a number to output input
|
|
@param[in] n number of type @a NumberType
|
|
@tparam NumberType the type of the number
|
|
@tparam OutputIsLittleEndian Set to true if output data is
|
|
required to be little endian
|
|
|
|
@note This function needs to respect the system's endianess, because bytes
|
|
in CBOR, MessagePack, and UBJSON are stored in network order (big
|
|
endian) and therefore need reordering on little endian systems.
|
|
*/
|
|
template<typename NumberType, bool OutputIsLittleEndian = false>
|
|
void write_number(const NumberType n)
|
|
{
|
|
// step 1: write number to array of length NumberType
|
|
std::array<CharType, sizeof(NumberType)> vec;
|
|
std::memcpy(vec.data(), &n, sizeof(NumberType));
|
|
|
|
// step 2: write array to output (with possible reordering)
|
|
if (is_little_endian != OutputIsLittleEndian)
|
|
{
|
|
// reverse byte order prior to conversion if necessary
|
|
std::reverse(vec.begin(), vec.end());
|
|
}
|
|
|
|
oa->write_characters(vec.data(), sizeof(NumberType));
|
|
}
|
|
|
|
public:
|
|
// The following to_char_type functions are implement the conversion
|
|
// between uint8_t and CharType. In case CharType is not unsigned,
|
|
// such a conversion is required to allow values greater than 128.
|
|
// See <https://github.com/nlohmann/json/issues/1286> for a discussion.
|
|
template < typename C = CharType,
|
|
enable_if_t < std::is_signed<C>::value and std::is_signed<char>::value > * = nullptr >
|
|
static constexpr CharType to_char_type(std::uint8_t x) noexcept
|
|
{
|
|
return *reinterpret_cast<char*>(&x);
|
|
}
|
|
|
|
template < typename C = CharType,
|
|
enable_if_t < std::is_signed<C>::value and std::is_unsigned<char>::value > * = nullptr >
|
|
static CharType to_char_type(std::uint8_t x) noexcept
|
|
{
|
|
static_assert(sizeof(std::uint8_t) == sizeof(CharType), "size of CharType must be equal to std::uint8_t");
|
|
static_assert(std::is_trivial<CharType>::value, "CharType must be trivial");
|
|
CharType result;
|
|
std::memcpy(&result, &x, sizeof(x));
|
|
return result;
|
|
}
|
|
|
|
template<typename C = CharType,
|
|
enable_if_t<std::is_unsigned<C>::value>* = nullptr>
|
|
static constexpr CharType to_char_type(std::uint8_t x) noexcept
|
|
{
|
|
return x;
|
|
}
|
|
|
|
template < typename InputCharType, typename C = CharType,
|
|
enable_if_t <
|
|
std::is_signed<C>::value and
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|
std::is_signed<char>::value and
|
|
std::is_same<char, typename std::remove_cv<InputCharType>::type>::value
|
|
> * = nullptr >
|
|
static constexpr CharType to_char_type(InputCharType x) noexcept
|
|
{
|
|
return x;
|
|
}
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|
|
|
private:
|
|
/// whether we can assume little endianess
|
|
const bool is_little_endian = little_endianess();
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|
|
|
/// the output
|
|
output_adapter_t<CharType> oa = nullptr;
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|
};
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|
} // namespace detail
|
|
} // namespace nlohmann
|